Informationsaufzeichnungs- und/oder -wiedergabegerät

Zusammengesetzte Objektivlinse mit zwei Brennpunkten und Vorrichtung mit dieser Linse

HALBLEITERSCHEIBENGROSSE INTEGRIERTE OPTISCHE ELEMENTE

Aperture stop for a flying optical head

Slider for optical disc data storage system

An optical disc data storage system (10) includes an optical disc (12) having a data surface. An actuator arm (24) having a distal end is selectively radially positionable adjacent the data surface. A transducing element (30) is carried on a slider (20) which is coupled to the distal end of the actuator arm (24). The slider (20) includes an air bearing surface (56) and the transducing element (30) includes an optical mesa (54) adjacent the air bearing surface (56). The optical mesa (54) is spaced apart from the data surface whereby contact between the data surface and the mesa structure (54) is prevented.

OBJECTIVE LENS FOR OPTICAL DISK

OPTICAL SYSTEM OF OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS

An optical system of an optical information recording/reproducing apparatus including a light source (10) for emitting a generally parallel luminous flux; an objective optical system for converging the luminous flux emitted from said light source portion onto a medium; a beam splitter (30) for splitting the luminous flux reflected by said medium from a light path directed to the light source portion and guiding the same to a light receiving system (40); a chromatic aberration correcting element (23) having almost no power disposed between said objective lens and said beam splitter and adapted to correct a chromatic aberration of said objective lens; and means for independently actuating said objective lens at least in an optical axis direction thereof.

PROCEDURE FOR OBTAINING SEVERAL INTEGRATED OPTICAL HEADS

OPTICAL SWEEP DEVICE

DEVICE FOR OPTICAL SCANNING OF A AUZEICHNUNGSMEDIUMS

Beam-shaping optical element and method and program for designing the same

OPTICAL REPRODUCING HEAD

Optical scanning device

INTEGRATED OPTICAL APPARATUS PROVIDING SEPARATED BEAMS ON A DETECTOR AND ASSOCIATED METHODS

An integrated optical apparatus includes an optically transparent substrate (21) with a light source (15) and a detector (17) mounted adjacent thereto. The substrate includes an optical element in a transmit path from the light source to a remote target. The optical element splits the light into more than one beam. A detector receives beams reflected by the target. All optical elements needed to create the more than one beam, direct the more than one beam onto the target and direct the more than one beam from the target to the detector are on the substrate and/or any structure bonded to the substrate. Preferably, the optical element provides sufficient separation between the more than one beam such that each beam is delivered to a unique respective light detecting element of the detector. The return path from the remote target to the detector may include an optical element for each beam or no optical elements. An additional substrate (11) may be included and bonded to the substrate. The ...

INTEGRATED MICRO-OPTICAL SYSTEMS

An integrated micro-optical system (61) includes at least two wafers with at least two optical elements (71, 73, 75, 77) provided on respective surfaces (50, 52, 54, 56, 58) of the at least two wafers. An active element (63) having a characteristic which changes in response to an applied field may be integrated on a bottom surface (67) of the wafers. The resulting optical system may present a high numerical aperture. Preferably, one of the optical elements is a refractive element formed in a material having a high index of refraction.

Optical information recording medium, reproduction method, and reproduction device

光学头及光盘驱动装置

... 本发明是一种光学头及光盘驱动装置，可防止温度变化和湿度变化导致的激光的像差的发生，确保激光的良好特性。其中形成有：复合透镜(14)，配置在从发光元件(11)向射束分裂器(15)入射的激光的光路上及从射束分裂器向受光元件(13)入射的激光的光路上，具备折射激光的光折射部(23)和对激光发挥规定功能的透镜部(24)，光折射部及透镜部等的各部分一体形成；通孔(14c)，使从发光元件向射束分裂器入射的激光通过该复合透镜。 ...

VARIABLE BEAM SHAPING ELEMENT

A beam-shaping element comprises a cavity, a first: fluid and a second fluid having different indices of refraction. An optical axis extends through the cavity. The cavity has at least one curved surface extending transverse the optical axis. At least one pump is arranged to pump the fluids between a first configuration in which the first fluid occupies the cavity, and a second configuration in which the second fluid occupies the cavity.

OPTICAL SCANNING DEVICE

An optical scanning device (21) is for scanning with a radiation beam a substantially circular track of an information layer (22). The device includes: (i) a radiation source (26) for providing the radiation beam (34), (ii) a lens system (27) for transforming the radiation beam to a scanning spot (38) in the information layer, the lens system including a first objective lens assembly (39) having an optical axis (CC'), (iii) a head rotation unit (59) for the first objective lens assembly which is rotatable about an axis of rotation (BB'), and (iv) first driving means (60) for rotating the head rotation unit about the axis of rotation. The center of curvature of the track substantially coincides with the axis of rotation. According to the invention, the objective lens assembly is movable substantially in a radial direction with respect to and perpendicular to the axis of rotation.

OPTICAL SCANNING DEVICE WITH PARALLEL-CONTROLLED ACTUATORS

The invention relates to an optical scanning device (17) for use in an optical player. The scanning device comprises an optical lens system (37) for focusing a light beam (45) into a scanning spot (47) on an information carrier (9) to be scanned. The scanning device comprises a first actuator (51) by means of which the lens system can be displaced in a direction parallel to an optical axis (39) of the lens system for focusing the light beam on the information carrier. The first actuator is controlled by means of a first control unit (87) via a first control signal (u¿C1). The lens system comprises a main or objective lens (55) and an auxiliary or solid-immersion lens (54) providing the lens system with a large numerical aperture, so that the scanning device can suitably be used to scan information carriers with a high information density, such as high-density compact discs. The main lens is elastically suspended with respect to the auxiliary lens, and the lens system comprises a second ...

OPTICAL HEAD USING MICRO-MACHINED ELEMENTS

An optical head utilizes a micro-machined element in combination with a light source and a lens to write and read data onto a storage disk (107). The micro-machined element may include a steerable micro-machined mirror (400) or a micro-actuator (433). A beam of laser light (191) transmitted from the light source (231) to the optical head and a reflected light from the storage disk (107) is altered by a movement of the micro-machined element. A focused optical spot (448) is scanned back and forth in a direction (450) which is approximately parallel to the radial direction of the storage disk (107).

Optical recording method, optical reproducing method, and optical reproducing apparatus

An optical recording method includes providing an optical recording medium capable of forming both a refractive index grating and an absorption grating by light irradiation; Fourier transforming with the same lens a signal beam that represents binary digital data with a brightness image and a reference beam such that they are focused at a point outside the optical recording medium; irradiating the Fourier transformed signal beam and reference beam simultaneously onto the optical recording medium and forming a diffraction grating at the optical recording medium according to an interference fringe between the signal beam and the reference beam, or according to an interference fringe within the signal beam itself; and recording the signal beam as a hologram.

Optical pickup apparatus including hologram element

An optical pickup device suitable for use as an optical system of, e.g., an optical disc recording and/or reproducing apparatus, for carrying out recording/reproduction of desired information onto an optical disc, e.g., a magneto-optical disc, a compact disc (CD) or a video disc. The device uses diffraction and various optical rotation devices to set the polarization ratio and to direct the incident and reflected light rays to the optical disk and to photodetectors. More specifically, a laser source, emitting light polarized in a single direction, is trisected into 0-th and +/-1-th order light. The rays are then rotated by an optical rotation device with +1-th order light rotating one way and -1-th order light rotating the other. The rays are converged on the optical disk, reflected, and then rotated again, providing a predetermined ratio of S and P polarized reflected light. The rays are then deflected by a hologram film to a photodetector, which then produces light quantity detection ...

Optical recording and reproducing apparatus

An optical recording and reproducing apparatus includes a light source for generating a parallel beam. A movable optical system condenses the parallel beam from the light source on the disk, splits the beam reflected by the disk into a first and a second beam, spatially inverts the second beam, and moves in the radial direction of the disk. A first split-beam detecting device has two light receiving surfaces which receive the first beam. A second split-beam detecting device has two light receiving surfaces which receive the second beam inverted in the movable optical system. A control device performs tracking control by moving the movable optical system in the radial direction of the disk in accordance with detection signals output from the first and second split-beam detecting devices.

Optical recording method, optical recording apparatus and optical recording medium

The UV laser light outgoing from a UV laser light source 1 is modulated in intensity by a light modulator 2 in accordance with the subsidiary information so as to fall on a mirror 14 via lenses 3, 4, a phase diffraction lattice 5 and a half mirror 11. The UV laser light is then reflected by the mirror 14 and condensed by an objective lens 6 so as to be radiated on an optical disc 8. The UV laser light outgoing from the UV laser light source 1 falls on a phase diffraction lattice via a light modulator 2 and lenses 3 and 4 so as to be radiated on the optical disc 8 via the half mirror 11, mirror 14 and the objective lens 6. On the other hand, the reflected light of the visible laser light reflected by the optical disc 8 falls on the half mirror 11 via the objective lens 6 and the mirror 14 so as to be reflected by the half mirror 11 to fall on a photodetector 13 via a cylindrical lens 12. By effecting focusing control and tracking control based upon an output signal of the photodetector 13 ...

Magneto-optical disk system with specified thickness for protective layer relative to the numerical aperture of the objective lens

A magneto-optical disc system includes a magneto-optical disc with a light-transmitting cover, an objective lens for bundling or focusing a laser beam on a magnetic recording layer of the magneto-optical disc in order to perform recording and/or reproduction, and a magnetic field generating unit obtained by forming a coil pattern in an optical glass. In the above system, the thickness t2 of the light-transmitting cover is set to fall within the range of 0.6 to 0.1 mm, and the numerical aperture (NA) of the objective lens is set to fall within the range of 0.55 to 0.70, so as to obtain high-density recording and/or reproduction by permitting the lens to be quite close to the actual recording layer.

Optical head apparatus including light focusing and refocusing lens systems

An optical head apparatus includes a light source, an objective lens, a beam splitter, a refocusing lens, a pinhole, and a photodetector. The objective lens and the beam splitter focus light emitted from the light source on an information recording medium. The objective lens, the beam splitter, and the refocusing lens refocus light reflected by the information recording medium and have a light-receiving numerical aperture which is larger than a light-focusing numerical aperture of the objective lens. The pinhole extracts only a central portion of light focused by the objective lens, the beam splitter, and the refocusing lens. The photodetector receives and detects light extracted by the pinhole.

Offset optics for use with optical heads

An optical head is provided for transmission of light between a source of light and a storage location along an optical path that includes at least one offset optical element.

Devices that produce a super resolved image for use in optical systems

Superresolution elements which provide masks and are integrated into superresolution lenses, and in confocal imaging, optical disk and reprographic systems and laser pattern generation systems. The elements are phase-only elements, where the phase transmittance varies across the diameter of the element while the amplitude transmission is kept to one, although the amplitude can be varied to provide more design flexibility. These element filters can be fabricated by means of a variety of techniques including diffractive optics technology, holographic methods, thin film deposition, and as gradient-index elements.

Optical element

An optical element ( 16 ) introduces a first wavefront deviation when a first radiation beam having a first wavelength passes through it and a second wavefront deviation when a second radiation beam having a second wavelength different from the first wavelength passes through it. One surface of the optical element comprises a phase structure in the form of annular areas ( 52, 53, 54, 55 ), the areas forming a non-periodic pattern of optical paths of different length. The optical paths for the first wavelength form the first wavefront deviation and the optical paths for the second wavelength form the second wavefront deviation, the difference between the two deviations being proportional to the difference between the first and second wavelength.

Split lens displaced long from each other along plane of cut

A method and apparatus for measuring the focus and tracking of a light beam on a medium in an optical data storage system. A split lens, comprising two halves of a lens separated along the optical axis and displaced from each other along the plane of the cut, is used to focus the light reflected or refracted from the medium onto a quad-cell. The quad cell comprises four light sensors arranged in four quadrants about a center point. According to the invention, the amount of light incident on quadrants of the quad-cell indicates the focus and alignment of the light beam on the medium. In accordance with another aspect of the invention, the above apparatus is used to measure the collimation or distribution of intensity of a light beam. Another aspect of the invention is the manufacture of the split lens. A lens is sawed into two halves and the halves are mounted using a housing displaced from each other along the plane of the cut.

Flying optical head with dynamic mirror

A magneto-optical flying head utilizes a steerable mirror in combination with a light source and a lens to write and read data onto a magneto-optical storage disk. A beam of laser light transmitted from the light source to the optical head is reflected onto a steerable micro-machined folding mirror. The reflected light from the folding mirror is directed through an embedded micro-objective GRIN lens. Fine tracking and short seeks to adjacent tracks are performed by rotating the mirror about an axis of rotation. In this way a focus spot is scanned back and forth in a direction which is approximately parallel to the radial direction of the storage disk.

Optical disk having a protective layer specified thickness relative to the NA of an objective lens and the wavelength of light source

An optical disc system uses an optical disc with a light-transmitting cover and an objective lens for bundling or focusing a light beam on a recording layer of the optical disc in order to perform recording and/or reproducing of information. The thickness of the light-transmitting cover falls within the range of 0.05 mm to 0.6 mm, the numerical aperture (NA) of the objective lens is set to fall within the range of 0.55 to 1.10, and the wavelength of the light beam is selected to be between 100 nm to 780 nm.

Optical pick-up device

An optical pick-up device for optically recording and/or reproducing information on an information record medium having plural record layers and guide tracking layers in the depth direction is disclosed. The optical pick-up device for optically recording and/or reproducing information on an information record medium having plural record layers and guide tracking layers in the depth direction comprises a first light source for radiating first light beam, a second light source for radiating second light beam which is different from the first light beam, plural objective lenses selectively arranged in a common optical path for the first light beam and the second light beam, for focusing first light beam and second light beam with different spot spacing, objective lens selection means for selecting objective lens arranged in a common optical path of plural objective lenses according to depth position of desired record layer to be recorded and/or reproduced of the information recording medium ...

OPTICAL INFORMATION RECORDING MEDIUM HAVING FIRST AND SECOND PIT ROW OF IDENTICAL REFLECTANCE

In a case where (i) a reflectance calculated from a reflected light amount obtained from a longest pit (Pmax) or a longest space (Smax) in a first pit row is defined as a first reflectance and (ii) a reflectance calculated from a reflected light amount obtained from a longest pit (Pmax) or a longest space (Smax) in the second pit row is defined as a second reflectance, the first pit row is formed such that the first reflectance becomes substantially identical with the second reflectance. 1: An optical information recording medium comprising:a recording layer which includes (i) a first region in which information is recorded by a first pit row that includes a pit whose length is shorter than that of an optical system resolution limit of a reproduction device and (ii) a second region in which information is recorded by a second pit row that is made up of pits whose length is equal to or longer than that of the optical system resolution limit,in a case where (i) a reflectance calculated from a reflected light amount obtained from a longest pit or a longest space in the first pit row is defined as a first reflectance and (ii) a reflectance calculated from a reflected light amount obtained from a longest pit or a longest space in the second pit row is defined as a second reflectance,the first pit row being formed such that the first reflectance becomes substantially identical with the second reflectance, andpolarity information for identifying a pit polarity being recorded in the second region.2: An optical information recording medium which is to be reproduced by a reproduction device that (i) emits reproduction light having a wavelength of 405 nm and (ii) includes an objective lens having a numerical aperture of 0.85 , said optical information recording medium comprising:a recording layer which includes (i) a first region in which information is recorded by a first pit row that includes a pit whose length is shorter than 119 nm and (ii) a second region in which ...

OPTICAL PICKUP, OPTICAL INFORMATION RECORDING METHOD, AND OPTICAL DISK APPARATUS

The recording accuracy of information on an optical disc is increased. An information optical system (150) of an optical disc apparatus (110) enables a semiconductor laser (3) to sequentially output specific peak light (LEP) and specific slope light (LES) as an information light beam (LM) and enables the correction lens (162) to change the divergence angle of the specific peak light (LEP) so that an absorption change area (RA) by the specific peak light (LEP) can be positioned at a far position in the recording layer (101). Thus, it is possible to form an energy concentration area (RE) by the specific slope light (LES) in the vicinity of a target position (QG), and the recording accuracy of information on the optical disc (100) can be increased.

Optical head device and optical information apparatus using the same

Pickup device

Disclosure is a pickup device of an apparatus for recording or reproducing information, by irradiation of a light beam, to and from a multi-layered recording medium having a plurality of recording layers laminated through spacer layers and formed on the recording layer a pre-pit region having a reflectivity different from a reflectivity of the surrounding. The device includes an illumination optical system having an objective lens for focusing a light beam onto any of the recording layers of the multi-layered recording medium, and a detecting optical system including a photodetector for receiving and photoelectrically converting reflection light from the recording layer of the multi-layered recording medium through the objective lens. The photodetector has a normalized detector size of a size of 10 µm2 to 50 µm2.

Optical disc system

MAGNETO-OPTIC STORAGE MEDIUM, OPTICAL HEAD, AND RECORDING/REPRODUCTION DEVICE

PROBLEM TO BE SOLVED: To improve the accuracy of the recording/reproduction signal of a magneto-optic storage medium. SOLUTION: The film thickness of a light transmission dielectric layer 6 near a converging lens 1 of a magneto-optic storage medium 2 where at least a metal reflection layer 3, a rear dielectric layer 4, a magneto-optic recording layer 5, and a light transmission dielectric layer 6 are successively laminated is set to be 50-80 nm. Alternatively, a refractive index (n) of the light transmission dielectric layer 6 is selected to satisfy a relationship of n0×0.8≤n, where n0 is the refractive index of the focusing lens 1. COPYRIGHT: (C)2000,JPO ...

Optische Abtastvorrichtung

Linsenhalter

In einem Linsenhalter (1) ist ein in eine Einsetzbohrung (2) eingesetzte Linse (10) durch ein Klebemittel (20) eingeklebt und festgelegt, das in Schlitze (4) eingegossen wurde, die so geformt sind, dass sie einen Außenwandbereich (3) des Linsenhalters unterteilen. Da einem ausreichenden Teil des Klebemittels gestattet ist, an der Linse zu haften, lässt sich die Linse im Linsenhalter mit ausreichender Festigkeit fixieren. Da zusätzlich in die Schlitze (4) eingegossenes Klebemittel (20) auch zur Außenseite der Schlitze des Linsenhalters (1) abfließen kann, ist es möglich, den Anteil des Klebemittels (20) zu reduzieren, der zur Seite der Einsetzbohrung (2) überfließt, und ist es möglich zu verhindern, dass das Klebemittel an einer aktiven Fläche der Linse (10) anhaftet.

Vorrichtung mit einer zusammengesetzten Objektivlinse mit zwei Brennpunkten

Erhöhung der Speicherdichte von Informationsspeichermedien

OBJECTIVE LENS SYSTEM OF OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS

Slider for optical disc data storage system

OBJECTIVE LENS AND SCANNING ARRANGEMENT WITH SUCH AN OBJECTIVE LENS

OPTICAL HEAD WITH SWITCHABLE DIAMETER OF THE RADIATION MARK ON THE RADIATION DETECTOR

INTEGRATED OPTICAL EQUIPMENT FOR THE PRODUCTION OF SEPARATE JETS ON A DETECTOR, AND ASSOCIATED ONE PROCEDURE

INTEGRATED MICRO-OPTICAL SYSTEMS

INTEGRATED MICRO-OPTICAL SYSTEMS

An integrated micro-optical system includes at least two wafers with at least two optical elements provided on respective surfaces of the at least two wafers. An active element having a characteristic which changes in response to an applied field may be integrated on a bottom surface of the wafers. The resulting optical system may present a high numerical aperture. Preferably, one of the optical elements is a refractive element formed in a material having a high index of refraction.

OPTICAL RECORDING AND REPRODUCING APPARATUS

WAFER LEVEL INTEGRATION OF MULTIPLE OPTICAL ELEMENTS

Integrated multiple optical elements may be formed by bonding substrates (10, 12) containing such optical elements together or by providing optical elements (22, 28) on either side of the wafer substrate. The wafer is subsequently diced to obtain the individual units themselves. A seal (16) for each die preventing the dicing slurry from getting between the wafers is desirable. The optical elements may be formed lithographically, directly, or using a lithographically generated master to emboss the elements. Alignment features facilitate the efficient production of such integrated multiple optical elements, as well as post creation processing thereof on the wafer level.

Optical information digital storage method for image-type parallel reading and writing

Optical head for recording small size disc and with annular holographic lenses for compatibility of various discs

SYSTEM OF OPTICAL CHARACTER READING FOR READING SIGNALS Of INFORMATION STORE ON an Optical disk

RESIN COMPOSITION AND MOLDED ARTICLE PRODUCED FROM THE COMPOSITION

A resin composition comprising 100 parts by mass of a polymer having an alicyclic structure in at least a part of a repeating unit and 0.05 to 5 parts by mass of a hindered amine compound having a carbon atom at a ratio of 67 to 80 wt% inclusive in the molecular structure and having a molecular weight of 500 to 3500 inclusive; a novel piperidine derivative having a piperidylaminotriazine skeleton; a molded article such as an optical component, which is produced by molding the resin composition; and an optical pickup device which utilizes the optical component. © KIPO & WIPO 2009 ...

OPTICAL DISK DRIVER

PURPOSE: An optical disk driver is developed to improve accuracy of a focus jump and reduce a time for seeking a target address by employing a controllable focus lens. CONSTITUTION: An optical disk driver for driving an optical disk having a plurality of signal recording layers includes an information reading part(60), an accelerating signal generating part(55), and a reduction part(55). The information reading part(60) radiates beam to one of the signal recording layers of the optical disk(1) through an object lens(42) and detects reflected beam to read the information. The accelerating signal generating part(55) generates accelerating signal to accelerate the object lens in a normal direction to another signal recording layer during the beam radiation of the information reading part(60). The reduction part(55) generates a reduction signal to reduce the object lens. COPYRIGHT 2000 KIPO ...

가변 격자들을 갖는 회절 광학 소자를 형성하기 위한 시스템 및 방법

... 본 출원의 실시예는 광학 컴포넌트를 형성하기 위한 시스템들 및 방법들을 제공한다. 방법은 플라즈마 소스와 작업물 사이에 복수의 근접 마스크를 제공하는 단계를 포함할 수 있고, 작업물은 작업물에 고정된 복수의 기판을 포함한다. 복수의 기판의 각각은 제 1 타겟 영역 및 제 2 타겟 영역을 포함할 수 있다. 방법은 플라즈마 소스로부터 경사진 이온 빔을 작업물을 향해 전달하는 단계를 더 포함할 수 있고, 경사진 이온 빔은 그런 다음 복수의 마스크 중 하나에서 수신된다. 제 1 근접 마스크는 경사진 이온 빔이 복수의 기판 각각의 단지 제 1 타겟 영역만을 통과하게 하는 제 1 개구 세트를 포함할 수 있다. 제 2 근접 마스크는 경사진 이온 빔이 복수의 기판 각각의 단지 제 2 타겟 영역만을 통과하게 하는 제 2 개구 세트를 포함할 수 있다.

OPTICAL SCANNING DEVICE

An optical scanning device is adapted for scanning record carriers (13, 27) having transparent layers (14, 28) of different thicknesses through which a converging beam (12, 26) must pass. An objective lens (11) of the device is designed to form the converging beam (14) for scanning through a first transparent layer (14). When scanning through a second transparent layer (28), the objective lens is operated at different conjugate distances, resulting in a small field. The field is increased by introducing spherical aberration in the radiation beam (25) incident on the objective lens and compensating this spherical aberration in the objective lens.

OPTICAL SCANNING HEAD FOR DATA STORAGE DISKS

Un DVD présente déjà une capacité de stockage supérieure d'un facteur 20 à celle d'un CD classique. Afin d'augmenter encore ladite capacité ainsi que la vitesse de lecture, l'invention propose trois solutions, toutes basées sur l'idée de transformer la tête de lecture optique connue de façon à obtenir une "tête multipoint pour DVD", qui permet de générer un nombre de points de focalisation supérieur au nombre minimum nécessaire à la détection synchrone de plusieurs pistes et couches. A cet effet, on utilise une tête de lecture optique (1) qui comporte une lentille multiplex (7) comprenant des structures réseaux de diffraction superposés (8) constitués d'une pluralité de réseaux de diffraction (J¿1, J¿2, J¿3,...J¿i). La tête de lecture peut comporter des séparateurs de faisceaux supplémentaires placés avant ou après le collimateur ou une pluralité de diodes laser à fonctionnement simultané, de longueurs d'onde proches. Des combinaisons sont également possibles. Avec les têtes de lecture ...

DEVICE FOR OPTICALLY SCANNING A RECORDING MEDIUM

An optical scanning device can scan two types of record carriers each having a transparent layer with a different thickness, in which a radiation beam scans an information layer of the record carrier through the transparent layer. When scanning a first type of record carrier the best focus of a scanning radiation beam is positioned on the information layer and when scanning a second type of record carrier the paraxial focus of the radiation beam is positioned on the information layer.

OPTICAL SCANNING HEAD FOR DATA STORAGE DISKS

Un DVD présente déjà une capacité de stockage supérieure d'un facteur 20 à celle d'un CD classique. Afin d'augmenter encore ladite capacité ainsi que la vitesse de lecture, l'invention propose trois solutions, toutes basées sur l'idée de transformer la tête de lecture optique connue de façon à obtenir une "tête multipoint pour DVD", qui permet de générer un nombre de points de focalisation supérieur au nombre minimum nécessaire à la détection synchrone de plusieurs pistes et couches. A cet effet, on utilise une tête de lecture optique (1) qui comporte une lentille multiplex (7) comprenant des structures réseaux de diffraction superposés (8) constitués d'une pluralité de réseaux de diffraction (J¿1, J¿2, J¿3,...J¿i). La tête de lecture peut comporter des séparateurs de faisceaux supplémentaires placés avant ou après le collimateur ou une pluralité de diodes laser à fonctionnement simultané, de longueurs d'onde proches. Des combinaisons sont également possibles. Avec les têtes de lecture ...

OPTICAL RECORDING APPARATUS

Apparatus for optical recording on a light-sensitive recording medium (4) includes an array (1) of discrete laser light sources for emitting a plurality of laser beams of a predetermined numerical aperture for forming an image of the array for focussing on the recording medium. The laser light sources of the array (1) are mounted at a predetermined pitch relative to each other and are arranged to be positioned at a predetermined distance from the recording medium. The apparatus also includes an optical arrangement (6, 7, 8), preferably including a microlens array (10), for splitting the image field into a plurality of lower numerical aperture light sources at an intermediate image space located between the laser light source array (1) and the recording medium (4) and for imaging the plurality of light sources of reduced numerical aperture through a final objective lens (11) in the focal plane of the recording medium (4) at a substantially reduced pitch relative to the pitch of the laser ...

A CONFOCAL OPTICAL MICROSCOPY SYSTEM FOR MULTI-LAYER DATA STORAGE AND RETRIEVAL

A confocal optical microscopy system for storing and retrieving optical information recorded in multiple layers in an optical disk. The invention includes a system utilizing the principle of confocal optical microscopy for accurately focusing a light beam (11) onto a plane of a layer (26) within a multi-layer disk (24). Optical information is thereby retrieved from the layer within the multi-layer disk. The invention also includes a method for recording optical data onto the multi-layer disk which comprises stacked multiple layers of transparent material having a distribution of discrete areas of metal film deposited between the layers. The distribution of metal film represents the recorded optical information.

Magneto-optical data storage system having an optical-processing flying head

A magneto-optical (MO) data storage system has a flying optical head supported over a MO storage medium, the flying head having channels or grooves formed therein and optical elements disposed within the grooves for directing an incident light beam to the storage medium and for receiving a reflected light beam from the storage medium. The flying head may comprise a two-piece assembly comprising a slider body which flies over the surface of the storage medium, and a separate optics mounting block formed to receive the optical elements and to be supported on the flying head. Preferably, the slider body is L-shaped and provides an angled surface for receiving a micro-machined mirror aligned with optical elements on the optics mounting block and controllable for deflecting the light beam to and from the storage medium.

Optical lens and method of making the same

A lens includes a center-of-gravity adjusting section in order to prevent the center of gravity of the lens from shifting due to removal of a gate portion formed during molding, thereby providing an optical lens which is easily handled and a method of making the optical lens. An optical lens having a flange at the outer periphery of an optically functioning portion includes a gate-cut section formed by cutting off a part of the flange together with a gate portion, continuously with the flange, and a center-of-axis adjusting section, formed by removing a part of the flange, for positioning the center of gravity in alignment with the optical axis of the optically functioning portion.

Optical pickup

An optical pickup for reading out information from an information recording media, such as an optical diskette, comprises a light source for irradiating light beam onto an optical diskette, an optical sensor for detecting the light beam reflected at the optical diskette, and an optical system including a wave plate and two hologram lenses. The first hologram lens diffracts the light beam from the light source, and the second hologram lens transmits the same light beam. On the other hand, the second hologram lens diffracts the reflected light beam from the optical diskette toward the optical sensor, and the first hologram lens transmits the same reflected light beam.

HOLOGRAPHIC CHARACTERIZATION AND PLAYBACK APPARATUS

A holographic characterization and playback apparatus is provided, which includes a light source, an optical path-forming optical system for separating the light emitted from the light source into a probe light and a reference light of different polarizations, and combining optical paths of the probe light and the reference light.

Method and apparatus for determining the cleanliness of a lens in an optical disc drive

Apparatus having corresponding methods comprise: a light source configured to produce light; a lens configured to focus the light on an optical disc; a photo detector configured to obtain a measurement of the light reflected by the optical disc; and a controller configured to determine a cleanliness of the lens based on the measurement of the light reflected by the optical disc responsive to the lens focusing the light on a surface of the optical disc.

Optical pickup and servo control system for digital data storage

Methods and apparatus are provided for retrieving encoded information from data tracks on an optical disk using an array of microlasers as the illumination sources, an array of micro-scale photo detectors as the detection elements, and a bilens (BL) or a holographic optical element (HOE) as the main optical component. Multiple configurations are provided to position microlasers and photo detectors together on a mobile laser/detector block (LDB). The microlasers and detectors may be arranged in a hexagonal lattice relationship for an optimally compact arrangement. Laser beams generated by the surface-emitting microlasers are guided by the BL onto the optical disk (OD) surface. The reflected light is collected by the same BL or HOE, shifted, and then directed back onto the respective photo detectors on the LDB. Illumination, detection and alignment methods and apparatus for tracking, focusing, and magnification servo controls are also incorporated on the LDB.

Optical pickup and disc player

PCT No. PCT/JP97/01573 Sec. 371 Date Jan. 9, 1998 Sec. 102(e) Date Jan. 9, 1998 PCT Filed May 9, 1997 PCT Pub. No. WO97/42632 PCT Pub. Date Nov. 13, 1997A disc player provided with an optical pick-up including plural object lens so that write and read operations of information signals can be carried out with respect to plural kinds of discs in which thicknesses of transparent bases are different from each other. In order that tracking error signal can be satisfactorily detected even in the case where either one of object lenses is used, a biaxial actuator 3 for supporting an object lens 5 moved on a line which is off the central axis C of a spindle motor 17 is disposed in a manner inclined by a predetermined angle theta with respect to the axis of a guide shaft 18, and movement operation direction of the object lens 5 is caused to be close to the direction perpendicular to recording tracks of the optical disc caused to undergo rotational operation by the spindle motor 17.

Optical system of optical information recording/reproducing apparatus

An optical system of an optical information recording/reproducing apparatus includes an objective lens for converging a generally parallel luminous flux. A chromatic aberration correction element for correcting chromatic aberration of the objective lens is provided and has substantially no power. The chromatic aberration correcting element comprises a positive lens and a negative lens positioned in the generally parallel luminous flux. The positive and negative lenses of the chromatic aberration correcting element have substantially the same refractive index and different Abbe's number.

Flat plate focus sensing apparatus

An optical element microstructure detects changes in the propagation angle of an optical beam on a local basis. The optical element microstructure preferably comprises an array of structures which are small compared to the size of the beam. Detection is done on a local basis, with each optical element in the microstructure array perturbing the optical beam in a predictable manner. By virtue of the number of optical sensing elements, the microstructure array is less sensitive to flaws in the optical elements, as compared to a single optical component placed in the path of the light. In addition, the microstructure lends itself to mass production by replication, and other low cost methods such as injection molding.

Оptiсаl rесоrding mеthоd, оptiсаl rеprоduсing mеthоd, аnd оptiсаl rеprоduсing аppаrаtus

Аn оptiсаl rесоrding mеthоd inсludеs prоviding аn оptiсаl rесоrding mеdium саpаblе оf fоrming bоth а rеfrасtivе indех grаting аnd аn аbsоrptiоn grаting bу light irrаdiаtiоn; Fоuriеr trаnsfоrming with thе sаmе lеns а signаl bеаm thаt rеprеsеnts binаrу digitаl dаtа with а brightnеss imаgе аnd а rеfеrеnсе bеаm suсh thаt thеу аrе fосusеd аt а pоint оutsidе thе оptiсаl rесоrding mеdium; irrаdiаting thе Fоuriеr trаnsfоrmеd signаl bеаm аnd rеfеrеnсе bеаm simultаnеоuslу оntо thе оptiсаl rесоrding mеdium аnd fоrming а diffrасtiоn grаting аt thе оptiсаl rесоrding mеdium ассоrding tо аn intеrfеrеnсе fringе bеtwееn thе signаl bеаm аnd thе rеfеrеnсе bеаm, оr ассоrding tо аn intеrfеrеnсе fringе within thе signаl bеаm itsеlf; аnd rесоrding thе signаl bеаm аs а hоlоgrаm.

Оptiсаl rесоrding mеthоd, оptiсаl rеprоduсing mеthоd, аnd оptiсаl rеprоduсing аppаrаtus

Аn оptiсаl rесоrding mеthоd inсludеs prоviding аn оptiсаl rесоrding mеdium саpаblе оf fоrming bоth а rеfrасtivе indех grаting аnd аn аbsоrptiоn grаting bу light irrаdiаtiоn; Fоuriеr trаnsfоrming with thе sаmе lеns а signаl bеаm thаt rеprеsеnts binаrу digitаl dаtа with а brightnеss imаgе аnd а rеfеrеnсе bеаm suсh thаt thеу аrе fосusеd аt а pоint оutsidе thе оptiсаl rесоrding mеdium; irrаdiаting thе Fоuriеr trаnsfоrmеd signаl bеаm аnd rеfеrеnсе bеаm simultаnеоuslу оntо thе оptiсаl rесоrding mеdium аnd fоrming а diffrасtiоn grаting аt thе оptiсаl rесоrding mеdium ассоrding tо аn intеrfеrеnсе fringе bеtwееn thе signаl bеаm аnd thе rеfеrеnсе bеаm, оr ассоrding tо аn intеrfеrеnсе fringе within thе signаl bеаm itsеlf; аnd rесоrding thе signаl bеаm аs а hоlоgrаm.

Compact dual wavelength optical pickup head

A dual wavelength optical pickup head in which as many same parts as possible are used as well to direct light beams incident than light beams reflected from a reflective layer of an optical disk. The reuse of as many parts as possible allows to reduce size and costs of such an optical pickup head. The optical pickup head comprises optical means for directing light beams of a first and a second wavelength emitted by a first and a second light source to an optical disk, a dual focus lens objective for focusing said light beams on a layer of said optical disk and a single detector which allows to detect light beams of either said first or said second wavelength.

Optical pickup device

Optical sampling arrangement for data record carrier arrangement The arrangement includes a radiation or light source for providing a scanning beam, a device for focusing the scanning beam to a sampling spot for reading the stored data from, or for storing data on a record carrier, and a detection system with a holographic optical element for receiving the scanning beam reflected by the record carrier. A mask of one-dimensional bars is provided in the radiation path before the detection system, extending over the entire surface area of the holographic optical element. The detection system includes preferably a detector whose width corresponds to a diameter of a light spot formed though the one-dimensional mask.

Zusammengesetzte Objetivlinse mit zwei Brennpunkten, und Vorrichtung mit dieser Linse

OPTISCHE ABTASTVORRICHTUNG MIT EINEM LINSENSYSTEM MIT EINSTELLBARER NEIGUNG

INTEGRIERTE MIKROOPTISCHE SYSTEME

Optisches Plattensystem

Optischer Aufzeichnungs/Abtastkopf für digital versatile disc (DVD)

Optisches System aus Hologrammlinsen.

OPTICAL REPRODUCING HEADS

OPTICAL SYSTEM OF OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS

OPTICAL LENS SYSTEM OF OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS

OPTICAL SCANNER

Disk cartridge with dual housing structure

SCANNING APPARATUS FOR FLUORESCENT MULTI-LAYER STORAGE.

OPTICAL PICKUP WITH HOLOGRAM LENSES

Optical information recording/reproducing apparatus

SYSTEME OPTIQUE POUR REPRODUCTION D'INFORMATIONS

Le système optique selon la présente invention comprend : une lentille d'objectif 3 pour focaliser sur un disque vidéo de support d'informations ponctuelles la lumière émise par un laser 1 à semi-conducteur dont la région rayonnante présente des dimensions longitudinale et latérale différentes, et une lentille de couplage 2 disposée entre la lentille d'objectif et la source laser pour concentrer la lumière de cette dernière. La lentille de couplage a un facteur de grossissement qui n'est pas supérieur à 7. Applications : lecture des vidéo-disques.

OPTICAL HEAD OF REPRODUCTION HAS LASER SEMICONDUCTOR

Dispositivo de captação óptica.

Optical head for near-field recording and reproduction, and method for manufacturing the same

An optical head for near-field recording and reproduction, and a method for manufacturing the optical head are provided, in which a vertical cavity surface emitting laser (VCSEL) and a photodetector are formed on a slider, and a lens layer, an optical path control layer and/or a coil member are directly formed over the VCSEL and the photodetector by thin film deposition. Because the optical system for information recording and reproduction is combined with the slider, so that the optical head becomes small, unlike an optical head adopting a slider and a large optical system, which are separated from each other. As a result, dynamic characteristics of the optical head improve, thereby reducing the time required for searching for a target track. Thus, the optical head is suitable for a micro information recording and reproducing system.

HIGH AREAL DENSITY HOLOGRAPHIC DATA STORAGE SYSTEM

An apparatus for recording or reading high areal density holographically stored information with high signal-to-noise ratio. The apparatus comprises a holographic imaging system for recording or reconstructing a holographic image, having a first numerical aperture and a first focal length and an additional optical system for filtering the signal beam, having a second numerical aperture and a second focal length, wherein the numerical aperture of the additional optical system is less than the numerical aperture of the holographic imaging system and/or the focal length of the additional optical system is greater than the optical length of the holographic imaging system.

OBJECTIVE LENS, AND OPTICAL PICKUP DEVICE USING THE OBJECTIVE LENS

An objective lens used for an optical pickup device having a numerical aperture (NA) of 0.7 or larger, comprising a plurality sheets of lenses, wherein the plurality sheets of lenses (1) and (2) are fixed to the inside of a cylindrical lens holder (3) in such a manner that, with one lens (1) used as a reference, the other lens (2) is positioned.

DEVICE FOR OPTICALLY SCANNING A RECORD CARRIER

A scanning device for an optical record carrier (1) comprises a high-numerical aperture dual lens objective system (10, 11) for focussing a radiation beam (7) on an information layer (3) of the record carrier. The lens (11) of the objective system closest to the record carrier is tilted by a tilt servo system in response to tilt of the record carrier. The tilt angle of the lens is preferably less than the tilt angle of the record carrier in order to reduce optical aberrations of the radiation beam such as coma and astigmatism.

Optical elements, method of replicating optical elements, particularly on a wafer level, and optical devices

Integrated multiple optical elements may be formed by bonding substrates containing such optical elements together or by providing optical elements on either side of the wafer substrate. The wafer is subsequently diced to obtain the individual units themselves. The optical elements may be formed lithographically, directly, or using a lithographically generated master to emboss the elements. Alignment features facilitate the efficient production of such integrated multiple optical elements, as well as post creation processing thereof on the wafer level.

DETECTION LENS, LENS UNIT, OPTICAL PICKUP DEVICE, OPTICAL DISC DEVICE, COMPUTER, OPTICAL DISC PLAYER AND OPTICAL DISC RECORDER

The present application discloses detection lens provided with lens portion and flange portion including first surface connected to lens portion and second surface opposite to first surface. Flange portion includes base along optical axis of lens portion, and first to fourth projections projecting from base. First and second projections are point-symmetric around optical axis. Third and fourth projections are point-symmetric around optical axis. Flange portion excludes projection extending beyond second surface. First projection includes first intersecting surface which intersects with first axis. Second projection includes second intersecting surface which intersects with first axis. Third projection includes third intersecting surface which intersects with second axis. Fourth projection includes fourth intersecting surface which intersects with second axis. First distance between first and second intersecting surfaces is longer than second distance between third and fourth intersecting surfaces. 1. A detection lens , comprising:a lens portion; anda flange portion including a first surface, to which the lens portion is connected, and a second surface opposite to the first surface, whereinthe flange portion includes a base disposed along an optical axis of the lens portion, a first projection, which projects along a first axis orthogonal to the optical axis, a second projection, which is point-symmetric to the first projection around the optical axis and projects from the base, a third projection, which projects along a second axis orthogonal to the optical axis and the first axis, and a fourth projection, which is point-symmetric to the third projection around the optical axis and projects from the base,the flange portion does not have a projection which extends beyond the second surface,the first projection includes a first intersecting surface which intersects with the first axis,the second projection includes a second intersecting surface which intersects with ...

SHAPE-VARIABLE OPTICAL ELEMENT AND OPTICAL READ/WRITE DEVICE INCLUDING THE SAME

An optical read/write device in accordance with an embodiment of the present invention includes a lens portion configured to irradiate light emitted from a light source to an optical recording medium, and the lens portion includes: a flexible shape-variable lens; and an electrode portion provided on the shape-variable lens. The shape of the shape-variable lens can be changed when voltage is applied to the electrode. 1. A shape-variable optical element comprising:a flexible shape-variable lens; andan electrode portion provided on the shape-variable lens,wherein a shape of the shape-variable lens is changed when voltage is applied to the electrode.2. The shape-variable optical element of claim 1 , wherein a shape of the electrode portion is changed when voltage is applied to the electrode.3. The shape-variable optical element of claim 2 , wherein the electrode portion is provided on a surface of the shape-variable lens.4. The shape-variable optical element of claim 2 , wherein the electrode portion is provided on an entire surface of the shape-variable lens.5. The shape-variable optical element of claim 2 , wherein the electrode portion is provided inside the shape-variable lens.6. The shape-variable optical element of wherein the electrode portion is made of electroactive polymer.7. An optical read/write device comprising a lens portion configured to irradiate light emitted from a light source to an optical recording medium claim 1 ,wherein the lens portion comprises:a flexible shape-variable lens; andan electrode portion provided on the shape-variable lens,wherein a shape of the shape-variable lens is changed when voltage is applied to the electrode.8. The optical read/write device of claim 7 , wherein the lens portion comprises the shape-variable lens in plurality claim 7 , andwherein each of the shape-variable lenses comprises at least one of the electrode.9. The optical read/write device of claim 8 , wherein the plurality of shape-variable lenses form an array ...

PLAYBACK DEVICE AND PLAYBACK METHOD

There is provided a playback device including a light source, an objective lens that radiates light emitted onto an optical recording medium, and onto which is incident reflected light obtained from a recording surface of the optical recording medium, a condenser lens that condenses the reflected light, a photodetecting section configured to, provided that a confocal position is a focal position of the condenser lens, λ is a wavelength of light radiated onto the optical recording medium, and NA is a numerical aperture of the objective lens, extract and detect light within a range of a diameter less than 1.5λ/NA centered on an optical axis at the confocal position, and a phase difference imparting section that imparts a designated phase difference between a reflected light component from a readout track and a reflected light component from a track neighboring the readout track. 1. A playback device comprising:a light source;an objective lens that radiates light emitted by the light source onto an optical recording medium, and onto which is incident reflected light obtained from a recording surface of the optical recording medium in accordance with the radiated light;a condenser lens, onto which is incident the reflected light obtained via the objective lens, that condenses the reflected light;a photodetecting section configured in a manner that, provided that a confocal position is a focal position of the condenser lens when the light emitted by the light source is focused onto the recording surface by the objective lens, λ is a wavelength of light radiated onto the optical recording medium by the objective lens, and NA is a numerical aperture of the objective lens, the photodetecting section extracts and detects light within a range of a diameter less than 1.5λ/NA centered on an optical axis at the confocal position, the light being central light of the reflected light at the confocal position; anda phase difference imparting section, inserted on a light path from ...

OPTICAL MEDIUM REPRODUCTION APPARATUS AND OPTICAL MEDIUM REPRODUCTION METHOD

The present disclosure relates to a reproduction apparatus. The reproduction apparatus may comprise an optical filter and electric filters. The optical filter may be configured to provide electrical signals corresponding to regions of an optical beam returning from an optical medium, the optical beam being incident on the optical filter, the regions of the optical beam corresponding to different bands in a line density direction and/or a track density direction. The electric filters may be configured to provide outputs based, at least in part, on the electrical signals provided by the optical filter, wherein the reproduction apparatus is configured to obtain a reproduced signal by combining the outputs of the electric filters. 1. A reproduction apparatus for optically reproducing an optical medium formed with a plurality of tracks on which binary data has been recorded by mark portions and space portions having different lengths , comprising:a light source configured to output a laser beam;an object lens configured to converge the laser beam onto the optical medium;an optical filter configured to separate a change of brightness/darkness caused, on a pupil plane of the reflected laser beam returning from the optical medium, by a structure of the plurality of tracks and the data recorded by the mark portions and the space portions having the different lengths on the tracks into a plurality of signals having different spatial optical frequencies of periodic structures in a direction along the tracks of the mark portions and the space portions on the plurality of tracks including a track to be reproduced and/or a direction which perpendicularly crosses the tracks;a plurality of electric filters to which the plurality of signals formed by the optical filter are supplied, respectively; anda binarization unit configured to obtain binary data by performing a binarization processing on an equalized signal obtained by computing outputs from the plurality of electric filters, ...

IMAGE DISPLAY DEVICE AND LIGHT GUIDING DEVICE

An image display device includes an image light generation unit configured to generate image light, a projection system optical unit configured to project the image light, a correction system optical unit configured to correct aberrations, a first diffraction element configured to deflect the image light incident on a first incident surface, and a second diffraction element configured to deflect the image light incident on a second incident surface. The projection system optical unit, the second diffraction element, the correction system optical unit, and the first diffraction element are arranged in this order in a direction of the image light emitted from the image light generation unit, and the image light deflected and dispersed into rays of respective wavelengths by the second diffraction element is focused by the first diffraction element. 1. An image display device comprising:an image light generation unit configured to generate and emit image light;a projection system optical unit configured to project the image light;a correction system optical unit configured to correct aberrations of the image light;a first diffraction element configured to deflect the image light incident on a first incident surface; anda second diffraction element configured to deflect the image light incident on a second incident surface, whereinthe projection system optical unit, the second diffraction element, the correction system optical unit, and the first diffraction element are arranged in this order in a direction of the image light emitted from the image light generation unit, andthe image light, which is incident on the second incident surface through the projection system optical unit and deflected and dispersed into rays of respective wavelengths by the second diffraction element, is incident on the first incident surface through the correction system optical unit and focused by being deflected by the first diffraction element.2. The image display device according to claim ...

HOLOGRAPHIC DATA STORAGE DEVICE WITH SINGLE-ARM STRUCTURE

The present invention relates to a holographic data storage device with a single-arm structure, and belongs to the technical field of optical holographic storage. According to the device disclosed in the present invention, a part of a reference arm and a part of a signal arm are integrated together to form a single-arm structure, which can not only reduce the number of optical and mechanical elements, but also reduce the system volume and cost without degrading performance. In addition, a signal beam and a reference beam share the same relay lens, so that the impact of environmental interference on the two beams is equal, and the stability of the entire system is improved. 1. A holographic data storage device with a single-arm structure , wherein a spherical light wave is used as a reference beam to interfere with a signal beam on a storage medium to form a hologram , and storage capacity is increased by a shift multiplexing method; a pair of beam combiner and beam splitter work in an optical system , and perform beam combining and splitting operations on the reference beam and the signal beam successively; and a relay lens group comprising a filter is disposed between the beam combiner and the beam splitter to transmit and filter patterns on a spatial light modulator.2. The holographic data storage device with a single-arm structure according to claim 1 , wherein the beam combiner and the beam splitter are optical elements with polarization selectivity characteristics.3. The holographic data storage device with a single-arm structure according to claim 1 , wherein the filter is a low-pass filter claim 1 , configured to control the size of the hologram on the storage medium.4. The holographic data storage device with a single-arm structure according to claim 1 , wherein at least one of lens elements in the relay lens group is installed on a translation stage in a beam axis direction.5. The holographic data storage device with a single-arm structure according to ...

SYSTEM AND METHOD FOR FORMING DIFFRACTED OPTICAL ELEMENT HAVING VARIED GRATINGS

Embodiments herein provide systems and methods for forming an optical component. A method may include providing a plurality of proximity masks between a plasma source and a workpiece, the workpiece including a plurality of substrates secured thereto. Each of the plurality of substrates may include first and second target areas. The method may further include delivering, from the plasma source, an angled ion beam towards the workpiece, wherein the angled ion beam is then received at one of the plurality of masks. A first proximity mask may include a first set of openings permitting the angled ion beam to pass therethrough to just the first target area of each of the plurality of substrates. A second proximity mask may include a second set of openings permitting the angled ion beam to pass therethrough just to the second target area of each of the plurality of substrates. 1. A system for generating angled gratings , the system comprising:a plasma source delivering an angled ion beam to a workpiece;a plurality of substrates coupled to the workpiece, each of the plurality of substrates including a first angled grating and a second angled grating; anda plurality of proximity masks positionable between the plasma source and the workpiece, wherein a first proximity mask of the plurality of proximity masks includes a first set of openings permitting the angled ion beam to pass therethrough to form the first angled grating of each of the plurality of substrates, and wherein a second proximity mask of the plurality of proximity masks includes a second set of openings permitting the angled ion beam to pass therethrough to form the second angled grating of each of the plurality of substrates.2. The system of claim 1 , wherein each of the plurality of substrates further includes a third angled grating claim 1 , and wherein a third proximity mask of the plurality of proximity masks includes a third set of openings permitting the angled ion beam to pass therethrough to form the ...

Optical medium reproduction apparatus and optical medium reproduction method

The present disclosure relates to a reproduction apparatus. The reproduction apparatus may comprise an optical filter and electric filters. The optical filter may be configured to provide electrical signals corresponding to regions of an optical beam returning from an optical medium, the optical beam being incident on the optical filter, the regions of the optical beam corresponding to different bands in a line density direction and/or a track density direction. The electric filters may be configured to provide outputs based, at least in part, on the electrical signals provided by the optical filter, wherein the reproduction apparatus is configured to obtain a reproduced signal by combining the outputs of the electric filters.

OPTICAL INFORMATION RECORDING MEDIUM HAVING FIRST AND SECOND PIT ROW OF IDENTICAL REFLECTANCE

In a case where (i) a reflectance calculated from a reflected light amount obtained from a longest pit (P1max) or a longest space (S1max) in a first pit row is defined as a first reflectance and (ii) a reflectance calculated from a reflected light amount obtained from a longest pit (P2max) or a longest space (S2max) in the second pit row is defined as a second reflectance, the first pit row is formed such that the first reflectance becomes substantially identical with the second reflectance. 1: An optical information recording medium comprising:a recording layer which includes (i) a first region in which information is recorded by a first pit row that includes a pit whose length is shorter than that of an optical system resolution limit of a reproduction device and (ii) a second region in which information is recorded by a second pit row that is made up of pits whose length is equal to or longer than that of the optical system resolution limit,in a case where (i) a reflectance calculated from a reflected light amount obtained from a longest pit or a longest space in the first pit row is defined as a first reflectance and (ii) a reflectance calculated from a reflected light amount obtained from a longest pit or a longest space in the second pit row is defined as a second reflectance,the first pit row being formed such that the first reflectance becomes substantially identical with the second reflectance, andthe second region recording therein medium identification information for identifying a medium.2: An optical information recording medium which is to be reproduced by a reproduction device that (i) emits reproduction light having a wavelength of 405 nm and (ii) includes an objective lens having a numerical aperture of 0.85 , said optical information recording medium comprising:a recording layer which includes (i) a first region in which information is recorded by a first pit row that includes a pit whose length is shorter than 119 nm and (ii) a second region in ...

SYSTEM AND METHOD FOR FORMING DIFFRACTED OPTICAL ELEMENT HAVING VARIED GRATINGS

Embodiments herein provide systems and methods for forming an optical component. A method may include providing a plurality of proximity masks between a plasma source and a workpiece, the workpiece including a plurality of substrates secured thereto. Each of the plurality of substrates may include first and second target areas. The method may further include delivering, from the plasma source, an angled ion beam towards the workpiece, wherein the angled ion beam is then received at one of the plurality of masks. A first proximity mask may include a first set of openings permitting the angled ion beam to pass therethrough to just the first target area of each of the plurality of substrates. A second proximity mask may include a second set of openings permitting the angled ion beam to pass therethrough just to the second target area of each of the plurality of substrates. 1. A system for generating angled gratings , the system comprising:a plasma source delivering an angled ion beam to a workpiece;a plurality of substrates coupled to the workpiece, each of the plurality of substrates including a first angled grating and a second angled grating; anda plurality of proximity masks positionable between the plasma source and the workpiece, wherein a first proximity mask of the plurality of proximity masks includes a first set of openings permitting the angled ion beam to pass therethrough to form the first angled gratings of each of the plurality of substrates, and wherein a second proximity mask of the plurality of proximity masks includes a second set of openings permitting the angled ion beam to pass therethrough to form the second angled gratings of each of the plurality of substrates.2. The system of claim 1 , wherein each of the plurality of substrates further includes a third angled grating claim 1 , and wherein a third proximity mask of the plurality of proximity masks includes a third set of openings permitting the angled ion beam to pass therethrough to form the ...

SYSTEM AND METHOD FOR FORMING DIFFRACTED OPTICAL ELEMENT HAVING VARIED GRATINGS

Embodiments herein provide systems and methods for forming an optical component. A method may include providing a plurality of proximity masks between a plasma source and a workpiece, the workpiece including a plurality of substrates secured thereto. Each of the plurality of substrates may include first and second target areas. The method may further include delivering, from the plasma source, an angled ion beam towards the workpiece, wherein the angled ion beam is then received at one of the plurality of masks. A first proximity mask may include a first set of openings permitting the angled ion beam to pass therethrough to just the first target area of each of the plurality of substrates. A second proximity mask may include a second set of openings permitting the angled ion beam to pass therethrough just to the second target area of each of the plurality of substrates. 1. A method , comprising:providing a plasma source and a plurality of substrates, each of the plurality of substrates including a first target area and a second target area; andpositioning a plurality of proximity masks between the plasma source and the plurality of substrates, wherein a first proximity mask of the plurality of proximity masks includes a first set of openings permitting an angled ion beam to pass therethrough to the first target area of each of the plurality of substrates, and wherein a second proximity mask of the plurality of proximity masks includes a second set of openings permitting the angled ion beam to pass therethrough to the second target area of each of the plurality of substrates.2. The method of claim 1 , further comprising:delivering, from the plasma source, the angled ion beam towards the plurality of substrates; andreceiving the angled ion beam at the first proximity mask or the second proximity mask.3. The method of claim 1 , wherein a third proximity mask of the plurality of proximity masks includes a third set of openings permitting the angled ion beam to pass ...

INFORMATION RECORDING DEVICE AND INFORMATION RECORDING METHOD

In recording technologies for batch formation of a plurality of recording bits in a recording medium by forming a plurality of optical spots using an ultrashort pulse laser and a spatial optical modulator, the hatch recordable hit number has an upper limit, resulting in restricted recording speed. The intensity of the optical spot is corrected to increase the batch recordable bit number for increasing the recording speed. 1. An information recording device comprising:a stage for holding an information recording medium;a short pulse laser source;a spatial optical modulator for displaying a hologram pattern so that a laser beam emitted from the short pulse laser source is modulated; andan image forming optical system having a focal length in inverse proportion to a parameter relating to a wavelength,wherein a multi-point optical spot in accordance with the hologram pattern displayed on the spatial optical modulator is formed in the information recording medium held by the stage via the image forming optical system; anda structural change is caused in the information recording medium by the multi-point optical spot for information batch recording by utilizing at least a region where intensity of the optical spot for recording is equal to or lower than 80% of intensity of the optical spot on an optical axis in the case where the focal length of the image forming optical system does not depend on the wavelength.2. The information recording device according to claim 1 , wherein the image forming optical system includes a lens disposed between the spatial optical modulator and the information recording medium.3. The information recording device according to claim 2 , wherein the image forming optical system includes a plurality of lenses.4. The information recording device according to claim 1 , wherein a function of the image forming optical system is partially realized by a pattern displayed on the spatial optical modulator.5. The information recording device according ...

OPTICAL INFORMATION RECORDING MEDIUM

In a case where (i) a reflectance calculated from a reflected light amount obtained from a longest pit (Pmax) or a longest space (Smax) in a first pit row is defined as a first reflectance and (ii) a reflectance calculated from a reflected light amount obtained from a longest pit (Pmax) or a longest space (Smax) in the second pit row is defined as a second reflectance, the first pit row is formed such that the first reflectance becomes substantially identical with the second reflectance. 1: An optical information recording medium comprising:a recording layer which includes (i) a first region in which information is recorded by a first pit row that includes a pit whose length is shorter than that of an optical system resolution limit of a reproduction device and (ii) a second region in which information is recorded by a second pit row that is made up of pits whose length is equal to or longer than that of the optical system resolution limit,in a case where (i) a reflectance calculated from a reflected light amount obtained from a longest pit or a longest space in the first pit row is defined as a first reflectance and (ii) a reflectance calculated from a reflected light amount obtained from a longest pit or a longest space in the second pit row is defined as a second reflectance,the first pit row being formed such that the first reflectance becomes substantially identical with the second reflectance, andthe first region having a narrower track pitch than the second region.2: An optical information recording medium which is to be reproduced by a reproduction device that (i) emits reproduction light having a wavelength of 405 nm and (ii) includes an objective lens having a numerical aperture of 0.85 , said optical information recording medium comprising:a recording layer which includes (i) a first region in which information is recorded by a first pit row that includes a pit whose length is shorter than 119 nm and (ii) a second region in which information is recorded ...

Liquid crystal lens element and optical head

There is provided a liquid crystal lens element capable of realizing a small element having no movable section, and having a lens function capable of multi-valued focal length switching of three values or above depending on the voltage applied. The liquid crystal lens element (10) varies the focal length of a light transmitting a liquid crystal (16) held between a pair of transparent substrates (11, 12) depending on a voltage applied to the liquid crystal (16). The liquid crystal lens element (10) comprises a Fresnel lens-like protruding/recessed part (17), and a liquid crystal layer (16A). Refractive index n of the liquid crystal layer (16A) varies from n1 when a voltage is not applied to n2 when a voltage is applied. Refractive index ns in the protruding/recessed part (17) is a value between n1 and n2 and satisfies a specific relation. When the maximum depth d at the protruding/recessed part (17) satisfies a specific relation, focal length is switched by switching the voltage level applied to the liquid crystal layer (16A) under predetermined conditions.

Liquid crystal lens element and optical head device

A liquid crystal lens element is provided, which can realize a small sized element having no moving part, and which has a lens function of switching the focal length among multiple focal lengths of at least 3 types according to an applied voltage. A liquid crystal lens element 10 is provided, which comprises a pair of transparent substrates 11 and 12 and a liquid crystal layer sandwiched between these substrates, wherein focal lengths of light transmitted through the liquid crystal 16 is changed depending on a voltage applied to the liquid crystal 16 , the liquid crystal lens element 10 has a Fresnel lens-shaped concave-convex portion 17 and a liquid crystal layer 16 A, and configured so that the refractive index n of the liquid crystal layer 16 A changes from a refractive index n 1 at a time of no application to a refractive index n 2 at a time of voltage application, a refractive index n s of the concave-convex portion 17 is a value between the refractive indexes n 1 and n 2 and satisfies a predetermined relation, and the maximum depth d of the concave-convex portion 17 satisfies a predetermined relation, the focal length can be switched by switching an applied voltage to the liquid crystal layer 16 A under the predetermined conditions.

Hologram recording and reproducing apparatus and method using Fourier transformation

본 발명에 따른 푸리에 변환을 이용하는 홀로그램 기록 장치는 간섭성의 광을 방출하여 참조광과 물체광의 간섭 패턴을 반투명 매체에 형성시키는 광원부, 상기 참조광과 물체광에 의해 형성된 간섭 패턴을 투과시키는 반투명 매체, 상기 반투명 매체에서 투과된 간섭 패턴을 푸리에 변환하는 푸리에 변환 렌즈, 상기 푸리에 변환 렌즈에서 푸리에 변환된 간섭 패턴을 기록하는 기록매체를 포함하는 것을 특징으로 한다. A hologram recording apparatus using a Fourier transform according to the present invention includes a light source section that emits coherent light to form an interference pattern of a reference light and an object light on a translucent medium, a translucent medium which transmits an interference pattern formed by the reference light and object light, A Fourier transform lens for Fourier transforming the interference pattern transmitted from the medium, and a recording medium for recording the Fourier-transformed interference pattern in the Fourier transform lens.

在全息存储介质中存储数据的结构

本发明涉及在全息存储介质中存储数据的结构，包括空间光调制器介质(18)，检测器(20)，全息存储介质(10)，位于空间光调制器介质与全息存储介质之间的第一透镜(22)，以及位于全息存储介质与检测器之间的第二透镜(24)，其中空间光调制器介质的表面与第一透镜的主平面之间的距离对应于第一透镜的焦距，第一透镜的主平面与穿过全息存储介质的参考平面之间的距离对应于第一透镜的焦距，其中穿过全息存储介质的参考平面与第二透镜的主平面之间的距离对应于第二透镜的焦距，第二透镜的主平面与检测器的感光面之间的距离对应于第二透镜的焦距，其中全息存储介质包括处于第一衬底层与第二衬底层之间的全息记录层，其中第一衬底层的厚度与第二衬底层的厚度不同，并且其中穿过全息存储介质的参考层并不穿过全息记录层，由此全息记录层处于与第一和第二透镜离焦的位置。

근접장 기록재생용 광헤드

공기동압에 의해 기록매체에서 부상된 상태로 정보의 기록재생을 수행하는 슬라이더 상에 광학요소가 배치된 구조의 근접장 기록재생용 광헤드가 개시되어 있다. 이 개시된 근접장 기록재생용 광헤드는 입사광이 투과되는 광투과공을 갖는 하부 슬라이더와; 하부 슬라이더 상에 결합 설치되며, 하부 슬라이더와 마주하는 면에 광학요소가 장착되는 장착홈이 인입 형성되고, 이 장착홈의 단부에 소정 기울기로 경사지게 형성되어 입사광을 반사시키는 반사면을 갖는 상부 슬라이더와; 장착홈에 설치되며, 기록매체 쪽으로 향하도록 광을 조사하는 광원과; 광투과공 내에 장착되어, 광투과공을 투과하는 광을 집속 투과시키는 수속렌즈와; 기록매체에 마주하는 하부 슬라이더의 일 면에 설치되어 기록매체에서 반사된 광을 수광하는 메인 광검출기;를 포함하는 것을 특징으로 한다.

Lens holder assembly of an optical pick up and Manufacturing method thereof

본 발명의 렌즈홀더조립체(100)는 실리콘기판(110), 렌즈지지체(120), 유리판(130), 회절부재(140) 및 비구면렌즈(150)를 포함한다. 실리콘기판(110)은 습식식각에 의해 그 중앙에 경사진 단면을 갖는 결합구(111)가 형성되고, 렌즈지지체(120)는 실리콘기판(110)의 결합구(111)에 성형되며 그 중앙에 대물렌즈(160)이 탑재되는 탑재구(121)와 광빔이 진행하는 관통구(122)가 형성되며, 유리판(130)은 광빔을 통과시킴과 동시에 결합구(111)를 봉하도록 실리콘기판(110)의 하면에 부착되고, 회절부재(140)는 유리판(130)의 하면에 부착되며, 비구면렌즈(150)는 렌즈지지체(120)에 형성된 관통구(122)에 의해 노출되는 유리판(130)의 상면에 형성된다. The lens holder assembly 100 of the present invention includes a silicon substrate 110, a lens support 120, a glass plate 130, a diffraction member 140, and an aspherical lens 150. The silicon substrate 110 is formed with a coupler 111 having an inclined cross section at the center thereof by wet etching, and the lens support 120 is formed at the coupler 111 of the silicon substrate 110 and at the center thereof. The mounting hole 121 on which the objective lens 160 is mounted and the through hole 122 through which the light beam travels are formed, and the glass plate 130 passes through the light beam and simultaneously seals the coupling hole 111. Is attached to the lower surface of the glass plate 130, the diffraction member 140 is attached to the lower surface of the glass plate 130, the aspherical lens 150 of the glass plate 130 is exposed by the through hole 122 formed in the lens support 120 It is formed on the upper surface. 광픽업, 렌즈홀더조립체, 렌즈지지체, 습식식각, 대물렌즈, 열경화성폴리머, 회절부재, 비구면렌즈, 유리판 Optical pickup, lens holder assembly, lens support, wet etching, objective lens, thermosetting polymer, diffraction member, aspherical lens, glass plate

Writing and reading device on the holographic digital data storage system

본 발명은 홀로그래픽 디지털 데이터 저장시스템의 기록 및 재생 장치에 관한 것으로, 특히 본 발명의 기록 장치는 광을 발생시키는 광원과, 광의 일부를 기준광 영역을 통해 투과시키고, 광의 나머지 부분을 홀로그래픽 데이터 패턴을 통해 투과시켜 신호광으로 변조시키는 공간 광 변조기와, 공간 광 변조기에서 전달된 광을 투과시키는 픽업 렌즈가 부착되며 픽업 렌즈의 위치를 이동시키는 액츄에이터와, 공간 광 변조기에서 전달된 신호광을 투과시키는 한쌍의 렌즈와, 픽업 렌즈를 통해 전달된 광을 기설정된 각도로 평행하게 투과시켜 기준광으로서 저장 매체에 입사시키면서, 한쌍의 렌즈를 통해 전달된 신호광을 투과시켜 저장 매체에 입사시키는 렌즈를 포함한다. 그러므로 본 발명은 픽업 렌즈가 부착된 액츄에이터를 통해 저장 매체로 입사되는 기준광 입사 각도를 조정하여 홀로그래픽 데이터를 기록 및 재생할 수 있기 때문에 종래 광 분리기, 미러 및 액츄에이터를 사용하지 않아 전체 시스템의 크기를 줄일 수 있다. The present invention relates to a recording and reproducing apparatus of a holographic digital data storage system. In particular, the recording apparatus of the present invention transmits a light source for generating light, a portion of the light through a reference light region, and the remaining portion of the light to a holographic data pattern. A spatial light modulator for transmitting the light through the spatial light modulator, an actuator for transmitting the light transmitted from the spatial light modulator, and an actuator for shifting the position of the pickup lens, and a pair of signal light transmitted through the spatial light modulator. A lens and a lens for transmitting the light transmitted through the pickup lens in parallel to a predetermined angle to enter the storage medium as a reference light, while transmitting the signal light transmitted through a pair of lenses to enter the storage medium. Therefore, since the present invention can record and reproduce the holographic data by adjusting the angle of incidence of the reference light incident on the storage medium through an actuator with a pickup lens, the size of the entire system can be reduced by not using a conventional optical separator, a mirror, and an actuator. Can be. 홀로그래픽, 기록 장치, 재생 장치, 픽업 렌즈, 액츄에이터 Holographic, recording device, playback device, pickup lens, actuator

Stacked near-field optical head and optical information recording and reproducing apparatus

광디스크장치 및 그것을 사용한 광정보처리장치에 관한 것으로서, 초고밀도이고 또한 소형의 공기록장치를 제공하는 것으로서, 반도체레이저, 광검출기, 격자소자, 커버층 등으로 이루어지는 초소형의 광헤드가 부상슬라이더상에 탑재되어 있는 구성으로 하였다. An optical disk device and an optical information processing device using the same, which provide an ultra-high density and small air lock device, wherein an ultra-compact optical head made of a semiconductor laser, a photodetector, a grating element, a cover layer, and the like is mounted on a floating slider. It was set as the structure mounted. 이렇게 하는 것에 의해, 초과기록밀도의 광기록장치용의 광헤드를 소형으로 구성하는 것이 가능하고, 이것을 부상 슬라이더에 탑재하고, 초점어긋남 의 조정이 불필요한 광기록장치를 구성하는 것이 가능하게 된다. By doing so, it is possible to make the optical head for the optical recording device of the excess recording density small, and to mount it on the floating slider, thereby making it possible to construct the optical recording device which does not need to adjust the focus shift.

Optical pickup device capable of recording/reproducing with high density

PURPOSE: An optical pickup device capable of recording/reproducing with high density is provided to realize simplified and compact structure by employing a single SIL unit having composite curved surfaces, and reduce the influence of coma aberration for expanding the micro tracking areas. CONSTITUTION: An optical pickup device capable of recording/reproducing with high density includes an optical module(21) for generating and radiating light and receiving reflected light, and a SIL(Solid Immersion Lens) unit(30) disposed on the light path between the light module and a recording medium(19) and formed with plane surfaces facing the recording medium to be adjacent to the recording medium and a plurality of ovally curved surfaces having different sizes from a central shaft for focusing incident light to form light spot on a recording surface of the recording medium.

Near-field optical data storage head minimized by using SIL

본 발명은 SIL(Solid Immersion Lens)을 이용한 초소형 근접 장 광 정보저장 헤드로서, 특히 활주 헤드를 이용하여 기록매질에 정보를 기록하고 재생하는 광 정보 저장 장치에 있어서 기록 밀도, 접속 속도 및 이동성을 높이기 위한 초소형 헤드에 관한 것이다. The present invention is an ultra-small near field optical information storage head using SIL (Solid Immersion Lens), particularly in the optical information storage device for recording and reproducing information on the recording medium using the slide head to increase the recording density, connection speed and mobility Relates to a micro head. 이를 위하여 본 발명에 따른 광 저장 헤드장치는, 기록 매질에 정보를 저장할 수 있는 광 저장 헤드장치에 있어서, 평면형의 광 도파로와; 상기 광 도파로의 양면 중 어느 일면에 부착되고, 상기 광 도파로를 따라 전달되는 입사 광의 경로를 변경시키는 하나 이상의 집광 회절격자와; 광원과 상기 집광 회절격자 사이의 상기 광 도파로의 일면에 부착되고, 신호 광의 경로를 변경시키는 하나 이상의 광분할 회절격자와; 일측은 곡면부로 구성되고 타측은 평면부로 구성되며, 상기 집광 회절격자에 의해 회절된 입사 광을 자신의 평면부의 한 점으로 결집시키는 SIL(Solid Immersion Lens); 및 자기장을 생성하는 코일을 포함하는 것을 특징으로 한다. To this end, the optical storage head device according to the present invention comprises an optical storage head device capable of storing information in a recording medium, comprising: a planar optical waveguide; One or more condensing diffraction gratings attached to either side of the optical waveguide, and for changing a path of incident light transmitted along the optical waveguide; One or more light splitting diffraction gratings attached to one surface of the optical waveguide between a light source and the condensing diffraction grating and changing a path of signal light; A SIL (Solid Immersion Lens) for converging incident light diffracted by the condensing diffraction grating to one point of its planar portion, the one side having a curved portion and the other side having a flat portion; And a coil for generating a magnetic field.

디지털 데이터 저장장치를 위한 광픽업 및 서보제어시스템

마이크로레이저배열을 조명원으로서, 마이크로크기의 광검출기배열을 탐지소자로서, 복렌즈(14) 또는 홀로그래픽 광소자(71)를 주요광콤포넌트로서 이용하여 광디스크 상의 데이터트랙으로부터 부호화된 정보를 회수하는 광픽업시스템(10). 표면발광마이크로레이저에 의해 발생되는 레이저빔들은 광디스크표면 상에서 복렌즈(14)에 의해 안내된다. 반사광은 동일한 복렌즈(14) 또는 홀로그래픽 광소자(71)에 의해 수집되어 이동되고 레이저/검출기블록(12) 상의 각각의 광검출기 상으로 복귀된다. 트랙킹, 포커싱 및 배율서보제어를 위한 조명, 검출 및 정합방법 및 장치는 레이저/검출기 블록(12) 상에 합체되기도 한다.

Photo-diode for the optical pick-up device

광 검출기의 메인 빔 스폿부와 서브 빔 스폿부 사이에 메인 빔과 서브빔간의 간섭을 차단하는 배리어를 설치함으로써 상기 빔간 간섭으로 인한 픽업 특성의 열화를 방지할 수 있고 광 픽업의 조정불량이나 경시변화에 의한 픽업 특성 열화를 방지할 수 있는 효과를 가지게 된다. By providing a barrier that blocks the interference between the main beam and the sub-beams between the main beam spot portion and the sub beam spot portion of the optical detector, it is possible to prevent deterioration of pickup characteristics due to the inter-beam interference, and misalignment or change of time of the optical pickup. It has an effect that can prevent the deterioration of pickup characteristics.

Optical system with grating lens assembly

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３次元ホログラフィックデータ格納システム

(57)【要約】 【課題】 より多くの量のホログラフィックデータを格 納媒体に記録し得る、改善された３次元ホログラフィッ クデータ格納システムを提供する。 【解決手段】 本発明の３次元ホログラフィックデータ 格納システムは、コヒーレント光線を発生する光源210 と、コヒーレント光線を基準ビーム及び信号ビームに分 離するビームスプリッター240 と、多重ホログラムを３ 次元的に格納する円筒形状の格納媒体262 と、基準ビー ム及び信号ビームを格納媒体262 に反射させる第１及び 第２ミラー242 、250 と、信号ビーム及び基準ビームを 有する平面に対して垂直であり、格納媒体の中点を貫く 軸に対して、格納媒体を回転させるステッピングモータ ー264 とを含む。

대화식 데이터 능력을 가진 광 시스템

조명원으로서 마이크로레이저들의 어레이(20, 22, 및/또는 24), 검출소자로서 마이크로 스케일 광검출기들의 어레이(26, 28, 30, 32, 46, 48, 50, 52, 56, 58, 및/또는 60), 그리고 주요 광 부품으로서 복렌즈(14)를 사용하여 광디스크상의 데이터 트랙들로 부터 부호화된 정보를 검색하는 방법과 장치가 제공된다. 마이크로레이저들(20, 22, 및/또는 24)와 광검출기들(26, 28, 30, 32, 46, 48, 50, 52, 56, 58, 및/또는 60)을 이동 레이저/검출기 블록(12)위에서 함께 위치조정하도록 다중구성이 제공된다. 상기 표면발광 마이크로레이저들(20, 22, 및/또는 24)에 의해 발생된 레이저 빔들이 복렌즈(14)에 의해 광디스크(16)표면위로 안내된다. 상기 반사된 광은 동일한 복렌즈(14)에 의해 수집되고, 이동된 다음, 레이저/검출기 블록(12)위 각각의 광검출기들(26, 28, 30, 32, 46, 48, 50, 52, 56, 58, 및/또는 60)위로 다시 보내진다. 트랙킹, 포커싱, 확대 서보 제어를 위한 조명, 검출 및 정렬 방법과 장치들이 레이저/검출기 블록(12)위에서 병합된다.

Optical Pick-up Device

본 발명은, 광검출기 앞의 센스렌즈의 위치를 정확하게 조정하도록 하여 광디스크로부터 반사하여 나오는 레이저빔을 광검출기에 정확히 수광할 수 있도록 하는 광픽업장치에 관한 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an optical pickup apparatus for accurately adjusting a position of a sense lens in front of a photodetector so that a laser beam reflected from an optical disk can be accurately received by a photodetector. 광픽업장치의 센스렌즈부는, 광디스크로부터 반사된 빔을 광검출수단에 수광시키기 위하여 빔을 수렴 투과시키는 센스렌즈; 및 상기 센스렌즈를 지지하기 위하여 내부에 광축방향으로 신장된 가이드홀을 형성하며, 상기 광축에 수직한 양 측면이 개방되고, 상기 광축방향을 따라 소정 측면이 개방되도록 형성된 가이드 프레임으로서, 상기 가이드 프레임 내부의 가이드 홀에 상기 센스렌즈를 광축과 동축으로 설치하고, 상기 광축방향을 따라 개방된 측면에 광축방향을 따라 가이드 마찰부를 구비하여, 상기 센스렌즈의 광축방향으로의 위치조정시 센스렌즈가 가이드 마찰부를 따라 원활히 이동될 수 있도록 한 상기 가이드 프레임을 포함한다. The sense lens unit of the optical pickup apparatus comprises: a sense lens for converging and transmitting the beam to receive the beam reflected from the optical disc to the light detecting means; And a guide frame extending in the optical axis direction to support the sense lens, wherein both side surfaces perpendicular to the optical axis are opened, and a predetermined side surface is opened along the optical axis direction. The sense lens is installed coaxially with the optical axis in an inner guide hole, and a guide friction part is provided along the optical axis direction on an open side along the optical axis direction, so that the sense lens is guided when the position of the sense lens is adjusted in the optical axis direction. It includes the guide frame to be able to move smoothly along the friction portion.

Apparatus for near field optical recorder

본 발명은 스핀들 모터가 구비된 디스크 장착부와, 상기 디스크 장착부의 일측에 설치되어 레이저의 조사 및 반사에 의해 상기 디스크의 신호를 기록 또는 재생하는 광헤드부와, 상기 광헤드부로부터 상기 디스크 장착부 측으로 연장된 아암과, 상기 광헤드부로부터 조사된 레이저를 디스크에 조사 및 반사하는 렌즈부와, 상기 렌즈부가 장착되고 상기 아암의 디스크측 단부에 설치되어 상기 디스크의 표면을 슬라이드 구동하는 슬라이더를 포함하여 구성된 근접장 광기록재생장치에 있어서, 상기 슬라이더는 상기 렌즈부가 상기 디스크의 회전축을 기준으로 외측 방향으로 치우쳐 장착된 것을 특징으로 하는 근접장 광기록재생장치를 제시함으로써, 디스크의 외곽에도 제한없이 신호를 기록 및 재생할 수 있는, 보다 진일보한 구조의 슬라이더를 구비한 근접장 광기록재생장치를 제공한다. The present invention provides a disk mounting unit having a spindle motor, an optical head unit installed at one side of the disk mounting unit for recording or reproducing a signal of the disk by irradiation and reflection of a laser, and from the optical head unit to the disk mounting unit. An extended arm, a lens unit for irradiating and reflecting the laser beam irradiated from the optical head unit, and a slider mounted to the lens unit and installed at the disk side end of the arm to slide the surface of the disk; In the configured near field optical recording and reproducing apparatus, the slider is provided with the near field optical recording and reproducing apparatus characterized in that the lens unit is biased outward with respect to the rotation axis of the disk, thereby recording a signal without limitation on the outer edge of the disk. And a slider of more advanced structure that can be reproduced. It provides a near field optical recording and reproducing apparatus.

포커스 에러 검출장치

본 발명은 포커스 에러 검출장치를 개시한다. 본 발명은 레이저 빔을 주사하는 레이저 다이오드와 이 레이저 다이오드로부터 주사된 빔을 광 디스크의 하면에 위치된 대물렌즈를 향해 반사되는 빔 스프리터와 상기 광 디스크로부터 반사된 빔을 상기 빔 스프리터의 하부에 위치된 포토 다이오드를 향해 집속주사하는 집속수단을 구비하는 포커스 에러 검출장치에 있어서 상기 집속수단이 그 중심면으로부터 그 대향되는 양측면을 향해 점차적으로 톱니형상의 굴절면 경사각이 변화되는 프레즈넬 렌즈를 구비하여 된 것으로 종래 반사광을 포토다이오드 즉, 4분할 수광 소자에 접속하기 위해 원통 또는 반원통형 렌즈를 사용하는 것에 비해 평탄형 프레즈넬 렌즈를 구비함으로써 그 가공이 용이하고 설치가 용이한 이점이 있으며 특히 단가절감을 도모할 수 있는 이점이 있다.

Optical head for near field recording/reading and method for manufacturing thereof

슬라이더 상에 표면광 레이저 및 광검출기를 형성하고, 그 위에 렌즈층과 광로제어층 및/또는 코일부재를 박막적층 기술을 응용하여 직접적으로 성형한 구조를 갖는 근접장 기록재생용 광헤드 및 그 제조방법이 개시되어 있다. An optical head for near field recording and reproduction having a structure in which a surface light laser and a photodetector are formed on a slider, and a lens layer, an optical path control layer, and / or a coil member are directly formed by applying a thin film lamination technique, and a manufacturing method thereof. Is disclosed. 이러한 근접장 기록재생용 광헤드는 기록재생을 위한 광학계가 슬라이더에 일체화되어 있으므로, 광헤드의 크기가 작을 뿐만 아니라, 종래의 슬라이더와 별도로 된 큰 부피의 광학계를 제거되어, 광헤드의 동적 특성이 개선되고 시크타임(seek time)을 줄일 수 있어서, 마이크로 기록재생장치에 적합하다. Since the optical system for recording and reproducing is integrated with the slider, the optical head for recording and reproducing the near field is not only small in size, but also eliminates a large volume of optical system separate from the conventional slider, thereby improving the dynamic characteristics of the optical head. In addition, the seek time can be reduced, which is suitable for the micro recording and reproducing apparatus.

Optical recording medium, disc system and apparatus

투광성 커버(41)를 구비하고 있는 광자기 디스크(40)와, 기록 및/또는 재생을 위해 레이저빔을 광자기 디스크(40)의 기록 자성층(43)에 집속하는 대물렌즈(2)와 광학유리(8)에 코일패턴(7)을 형성하여 이루어지는 자계 발생장치(9)를 구비하는 광자기 디스크 시스템이 개시되어 있다. 이 광자기 디스크 시스템에 의하면, 상기 투광성 커버(41)의 두께 t 2 를 0.6∼0.1mm, 상기 대물렌즈(2)의 개구수(NA)를 0.55∼0.70으로 함으로써, 보다 고밀도의 기록 및/또는 재생을 할 수 있다. The magneto-optical disk 40 having a translucent cover 41, the objective lens 2 and the optical glass for focusing the laser beam on the recording magnetic layer 43 of the magneto-optical disk 40 for recording and / or reproduction. Disclosed is a magneto-optical disk system including a magnetic field generator (9) formed by forming a coil pattern (7) at (8). According to this magneto-optical disk system, recording density and / or higher density are achieved by setting the thickness t 2 of the transparent cover 41 to 0.6 to 0.1 mm and the numerical aperture NA of the objective lens 2 to 0.55 to 0.70. You can play.

Liquid crystal lens element and optical head

提供一种能实现无活动部的小型元件并且具有能根据施加电压切换大于等于3个值的多值焦距的透镜功能的液晶透镜元件。这种液晶透镜元件(10)根据施加在移动透明衬底(11、12)夹住的液晶(16)的电压，使穿透液晶(16)的光的焦距变化，并且具有菲涅耳透镜状的凹凸部(17)和液晶层(16A)，液晶层(16A)的折射率n从不施加电压时的折射率n 1 变化到施加电压时的折射率n 2 ，凹凸部(17)的折射率n s 的值在折射率n 1 与n 2 之间而且满足规定关系，凹凸部(17)的最大深度d满足规定关系时，利用切换一定条件下对液晶层(6A)施加的电压值，切换焦距。

Liquid Crystal Lens Element and Optical Head Device

가동부가 없는 소형 소자가 실현 가능함과 함께, 인가 전압에 따라 3치 이상의 다치 초점 거리의 전환이 가능한 렌즈 기능을 가지는 액정 렌즈 소자를 제공한다. A liquid crystal lens element having a lens function capable of realizing a small element without a movable part and switching a multi-value focal length of three or more values in accordance with an applied voltage is provided. 한 쌍의 투명 기판 (11, 12) 에 협지된 액정 (16) 에 인가하는 전압에 따라 액정 (16) 을 투과하는 광의 초점 거리를 변화시키는 액정 렌즈 소자 (10) 로서, 프레넬 렌즈 형상의 요철부 (17) 와, 액정층 (16A) 을 가지고, 액정층 (16A) 의 굴절률 n 이 전압 비인가시의 굴절률 n 1 부터 전압 인가시의 굴절률 n 2 까지 변화하고, 요철부 (17) 의 굴절률 n s 가 굴절률 n 1 과 n 2 사이의 값임과 함께 소정 관계를 만족시키며, 요철부 (17) 의 최대 깊이 (d) 가 소정 관계를 만족시킬 때, 일정 조건하에서의 액정층 (16A) 에 대한 인가 전압치의 전환에 의해 초점 거리가 전환되도록 구성하였다. Fresnel lens-shaped unevenness as a liquid crystal lens element 10 which changes the focal length of light passing through the liquid crystal 16 in accordance with a voltage applied to the liquid crystal 16 sandwiched by the pair of transparent substrates 11 and 12. It has the part 17 and the liquid crystal layer 16A, and the refractive index n of the liquid crystal layer 16A changes from refractive index n 1 at the time of no voltage application to refractive index n 2 at the time of voltage application, and the refractive index n of the uneven part 17 When s is a value between the refractive indices n 1 and n 2 , and satisfies a predetermined relationship, and when the maximum depth d of the uneven portion 17 satisfies the predetermined relationship, the voltage applied to the liquid crystal layer 16A under constant conditions The focal length is configured to be switched by switching the values. 액정 렌즈 소자, 광헤드 장치 Liquid Crystal Lens Element, Optical Head Device

Optical transducer

FIELD: optical data recording and reproducing systems. SUBSTANCE: transducer has optical module designed for emitting light and recording light flux reflected from record medium as well as solid-state immersion lens inserted between module and record medium. Lens has flat surface facing the data medium and several elliptically curved surfaces of different curvature radii to ensure symmetry relative to center line of its surface taking incident light from module for focusing light beam onto recording surface of data medium. EFFECT: enhanced recording and reproducing density level. 4 cl, 8 dwg О9д6дЬЕс ПЧ с» РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (19) (13) ВИ `” 2 179 750 (51) МПК’ (11 В 7/435 С2 (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 99109100/28, 26.04.1999 (24) Дата начала действия патента: 26.04.1999 (30) Приоритет: 27.04.1998 КК 98-14990 (46) Дата публикации: 20.02.2002 (56) Ссылки: ММО 98/09284 А2, 03.05.1998. ЕР 0814468 А2, 29.12.1997. 4$ 5422810 А, 06.06.1995. $ЧЦ 551589 А, 26.04.1977. $Ч 1432600 АЛ, 23.10.1988. (98) Адрес для переписки: 129010, Москва, ул. Большая Спасская 25, стр.3, ООО "Юридическая фирма Городисский и Партнеры", Е.И.Емельянову (71) Заявитель: САМСУНГ ЭЛЕКТРОНИКС КО., ЛТД. (КВ) (72) Изобретатель: ЧО Кун-хо (КК), ИОО Дзанг-хоон (КК), ЛИ Ионг-хоон (КК), ЛИ Чул-воо (КК), ЧУНГ Чонг-сам (КК) (73) Патентообладатель: САМСУНГ ЭЛЕКТРОНИКС КО., ЛТД. (КК) (74) Патентный поверенный: Емельянов Евгений Иванович (54) ОПТИЧЕСКИЙ ДАТЧИК (57) Устройство используется в оптических системах записи и воспроизведения информации. Датчик содержит световой модуль для излучения и приема светового потока, отраженного от носителя записи, и твердотельную иммерсионную линзу, расположенную между модулем и носителем записи. Линза имеет плоскую поверхность, обращенную к носителю информации, и несколько эллиптически изогнутых поверхностей с различными —радиусами кривизны для обеспечения симметричности по отношению к центральной ...

光ピックアップ装置

(57)【要約】 【課題】 高周波重畳法を用いた光ピックアップ装置に あって、高周波重畳回路を、別個のプリント基板を用い ることなく、ＦＰＣ上に搭載することで、作業工程を低 減し、コスト削減を図る。また、高周波重畳回路のＧＮ Ｄを広くて安定なＧＮＤへ短い配線距離で接続して、不 要輻射防止効果を高める。 【解決手段】 高周波重畳回路３５をＦＰＣ１４上に搭 載する。これにより、プリント基板取り付けの工程が少 なくなり、組立作業性が向上する。また、ＦＰＣ１４の 突出部１４ａに形成したＧＮＤパターン３６ａに導通し た導電メッキ面と、補強板４１の導電メッキ面とを電気 的に接続することにより、ＧＮＤパターン３６ａを短い 距離で広いＧＮＤに接続することができ、不要輻射抑制 作用が高まる。

Opto-magnetic recording/reproducing apparatus

PURPOSE: A device for recording/reproducing an optical magnet is provided to reduce the number of optical aperture by enhancing one end portion of an optic fiber by using an adjacent window explorer structure and to reduce an access time by making a portion of one end of the optic fiber be contacted and slid to a recording medium. CONSTITUTION: A movable unit(300) is rotatably arranged at a recording medium(40), and makes a light provided from a fixing optical system(100) be focused on a predetermined position of the recording medium(40). An optic fiber(200) both ends thereof are connected to the fixing optical system(100) and the movable unit(300), respectively, and transmits a light. The fixing optical system(100) is fixed to a main body, and creates and irradiates a light being demanded for recording/reproducing information in the recording medium(40). The optic fiber(200) comprises a core and a clad having a different refraction rate to that of the core. The clad surrounds the core, and inputted light is guided through the core. The movable unit(300) makes the light guided through the optic fiber(200) which was irradiated in the fixing optical system(100) be focused on a predetermined position of the recording medium(40).

Recording / reproducing optical system manufacturing method

Apparatus for processing of optical information and method for align of polytopic filter by using the same

An apparatus for processing optical information and a polytopic filter aligning method using the same are provided to carry out alignment of polytopic filters for filtering a reproduction light by using the quantity of the reproduction light through a reproduction light optical system so as to align the polytopic filters when playing or recording optical information, thereby improving reproduction efficiency of the optical information. An optical information processing apparatus(100) comprises a reference light optical system(130), a signal light optical system(140), a light detector(160), and a reproduction light optical system(150). The reference light optical system generates a reproduction light from a reference light. The signal light optical system loads data on the signal light and performs Fourier-Transformation of the signal light. The reproduction light optical system carries out alignment of a polytopic filter for filtering the reproduction light, using the quantity of the reproduction light. The reproduction light optical system includes an inverse Fourier-Transformation lens(152), and a polytopic filter part(154) for aligning the polytopic filter. The polytopic filter part has polytopic filters(156), filter operating parts(158), and filter control parts.

Method and apparatus for discriminating DVDRAM disk in disk drive

본 발명은 디스크 드라이브의 디스크 판별 방법 및 장치에 관한 것으로서, 특히 DVD 계열 내에서 정확하게 DVDRAM 디스크를 판별하기 위한 디스크 드라이브의 DVDRAM 디스크 판별 방법 및 장치에 관한 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc discrimination method and apparatus for a disc drive, and more particularly, to a disc RAM disc discrimination method and apparatus for accurately disclosing a DVDRAM disc in a DVD series. 본 발명에 의하면 디스크 드라이브의 디스크 판별 모드에서 DVDRAM 디스크를 디스크 반사 신호를 이용하여 판정함으로써, DVDRAM 디스크가 카트리지를 사용하지 않는 경우에도 정확하게 DVDRAM 디스크를 판별할 수 있는 효과가 발생된다. According to the present invention, by determining the DVDRAM disc using the disc reflection signal in the disc determination mode of the disc drive, the effect of accurately disclosing the DVDRAM disc even when the DVDRAM disc does not use a cartridge is generated.

Optical recording and reading apparatus of Near Field for straight line drive

본 발명은 디스크 표면에 근접하여 대향되는 대향렌즈를 탑재하는 슬라이더를 포함하여 구성되고, 상기 디스크에 근접장광을 입사시켜 정보를 기록 또는 재생하는 근접장 광기록재생장치에 있어서, 픽업 헤드를 지지하고 직선 회동 범위 내에서의 회동을 가이드하는 서로 대칭한 제 1 및 제 2지지 및 가이드부와; 상기 직선 회동 범위 내에서 제 1 및 제 2지지 및 가이드부의 회동을 지지하는 서로 수평한 제 1 및 제 2회동축과; 상기 제 1 및 제 2지지 및 가이드부를 제 1 및 제 2회동축을 따라 회동시켜 주기 위한 자기회로를 구성하여, 보다 안정된 디스크의 기록 및 재생할 수 있는, 진일보한 직선 회동 구조의 근접장 광기록재생장치를 제공한다.

Laminated near-field optical head and optical information recording / reproducing device

Writing device on the holographic digital data storage system

본 발명은 홀로그래픽 디지털 데이터 저장시스템의 기록 장치에 관한 것으로, 특히 광원으로부터 입력되는 레이저 광을 기준광과 신호광으로 분기한 후, 분기된 기준광을 제1광경로를 통해 전송하고, 분기된 신호광을 제2광경로를 통해 각각 전송하는 광 분리기와, 광 분리기로부터 제1광경로를 통해 제공되는 기준광을 0차 신호 성분만을 차단시키는 필터와, 필터에서 0차 신호 성분이 차단된 기준광을 기설정된 각도로 반사시켜 저장 매체에 입사시키는 미러와, 광 분리기로부터 제2광경로를 통해 제공되는 신호광을 홀로그래픽 디지털 데이터로 변조시켜 저장 매체에 입사시키는 공간 광 변조기를 포함한다. 그러므로 본 발명은 저장 매체로 입사되는 기준광 경로에 0차 신호 성분만을 차단하기 위한 필터를 추가함으로써 기준광의 0차 신호 성분으로 인한 저장 매체의 다이나믹 레인지 소모를 줄일 수 있다 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus of a holographic digital data storage system, and in particular, after splitting laser light input from a light source into a reference light and a signal light, transmitting the branched reference light through the first optical path, and removing the branched signal light. An optical splitter transmitting through the two optical paths, a filter for blocking only the 0th order signal component from the reference light provided from the optical splitter through the first optical path, and a reference angle from which the 0th order signal component is blocked by the filter at a predetermined angle. And a mirror for reflecting and entering the storage medium, and a spatial light modulator for modulating the signal light provided from the optical separator through the second optical path into holographic digital data and entering the storage medium. Therefore, the present invention can reduce the dynamic range consumption of the storage medium due to the zero-order signal component of the reference light by adding a filter to block only the zero-order signal component in the reference light path incident on the storage medium. 홀로그래픽 디지털 데이터 저장 시스템, 기준광, 0차, 필터 Holographic Digital Data Storage System, Reference Light, Zeroth Order, Filter

Lens for optical recording and reproducing system

본 발명은 렌즈의 상면 중앙에는 외부로부터 빛이 입사되는 입사부가 형성되어 있고, 입사부 주위에는 반사면이 형성되어 있고, 렌즈 하면의 주변부는 빛이 투과되는 투과면인 상부 렌즈와, 렌즈 상면의 주변부는 투과면이고, 렌즈의 하면은 포물면(paraboloid)이며, 상기 포물면의 중앙은 평탄면이고, 포물면에서 상기 평탄면을 제외한 부분은 반사면인 하부 렌즈로 구성되며, 상부 렌즈의 하면과 하부 렌즈의 상면은 서로 접해있고, 두 렌즈 사이의 접합면에는 중앙에 반사수단이 형성되어 있는 것을 특징으로 하는 광 기록 및 재생 시스템용 광학렌즈를 제공한다. According to the present invention, an incidence part is formed at the center of the upper surface of the lens, and a reflection surface is formed around the incidence portion. The periphery is a transmissive surface, the lower surface of the lens is a paraboloid, the center of the parabolic surface is a flat surface, the part except the flat surface of the parabolic surface is composed of a lower lens which is a reflective surface, the lower and lower lenses of the upper lens The upper surface of the contact with each other, the bonding surface between the two lenses provides an optical lens for optical recording and reproducing system, characterized in that the reflecting means is formed in the center.

High density recording / playback optical pickup

광을 생성 출사하고 기록매체에서 반사되는 광을 수광하는 광모듈과, 광모듈과 기록매체 사이의 광경로 상에 배치되며 기록매체에 근접되도록 기록매체를 향하는 면은 평면을 이루고 광모듈을 향하는 면은 그 중심축으로부터 서로 다른 크기를 갖는 복수의 타원 곡면이 형성되어 입사광을 집속시켜 기록매체의 기록면에 광스폿이 형성되도록 하는 실(Solid Immersion Lens)부재를 구비하는 고밀도 기록/재생 가능한 광픽업장치가 개시되어 있다. 이 고밀도 기록/재생 가능한 광픽업장치는 복합 곡면을 갖는 1매의 실부재를 채용하므로, 간단하고 컴팩트한 구조를 가지며 코마수차의 영향이 크게 줄어들어 입사광의 틸트에 둔감하며 미세 트랙킹 영역이 넓어지게 된다.

Focus error detection device

기록재생용 광픽업에 있어서 광디스크에 대한 대물렌즈의 포커스에러의 정도를 알리는 신호를 검출하기 위한 포커스에러 검출장치가 개시되어 있다. 개시된 장치는 빔사이즈법에 있어서 부품을 간소화하기 위한 것으로 광디스크의 반사광을 그 광축으로부터 양편으로 나누어 각각 집속시키는 2개의 집속렌즈와 각각 집속되는 빔을 수광하는 2개의 광검출기를 구비한다. 그 2개의 집속렌즈는 각각 초점거리가 다르게 설계된 것으로, 빔스프리터의 사용을 배제시켜 부품의 간소화 및 배치의 최적화에 기여하며, 특히 광축 틸트와 쉬프트에 의한 영향을 거의 제거시켜 안정된 동작에도 기여한다.

Optical pickup apparatus for read/write heads in high density optical storages

본 발명의 고밀도 기록/재생이 가능한 광픽업 장치는 광을 생성, 출사하고 광기록 매체에서 방사되는 광을 수광하는 광모듈과, 상기 광모듈과 광기록 매체 사이의 광경로에 배치되어, 상기 광기록 매체의 기판쪽에 근접되도록 상기 광기록 매체의 기판쪽에 향하는 제1면은 평면을 이루고 상기 광모듈을 향하는 제2면은 비구면을 이루는 고체 침지 렌즈를 포함한다. 고체 침지 렌즈는 추가의 집광용 대물렌즈 없이 광모듈에서 나온 빔을 집광시켜 광기록매체의 기판을 통과하여 상기 광기록 매체의 신호기록면에 결상시킨다. 광모듈에서 나온 빔이 평행빔이고 고체 침지 렌즈가 광기록 매체의 기판의 굴절률과 같은 굴절률을 가지는 경우, 고체 침지 렌즈의 제2면은 타원면이 되고, 한편 광모듈에서 나온 빔이 발산빔이고 고체 침지 렌즈가 광기록 매체의 기판의 굴절률과 같은 굴절률을 가지는 경우, 고체 침지 렌즈의 제2면은 카티지안 오벌면이 된다. An optical pickup apparatus capable of high density recording / reproducing according to the present invention includes an optical module for generating and emitting light and receiving light emitted from an optical recording medium, and an optical module disposed in an optical path between the optical module and the optical recording medium. The first surface facing the substrate side of the optical recording medium is planar and the second surface facing the optical module comprises a solid immersion lens that is close to the substrate side of the recording medium. The solid immersion lens focuses the beam from the optical module without an additional focusing objective lens and passes through the substrate of the optical recording medium to form an image on the signal recording surface of the optical recording medium. If the beam from the optical module is a parallel beam and the solid immersion lens has the same refractive index as that of the substrate of the optical recording medium, the second surface of the solid immersion lens becomes an ellipsoid while the beam from the optical module is a diverging beam and solid When the immersion lens has a refractive index equal to the refractive index of the substrate of the optical recording medium, the second surface of the solid immersion lens becomes the cottage oval surface.

Optical pick-up

The optical pick-up for optical or magneto-optical disc drive apparatus, has hologram lens element formed of pattern diffracting spherical wave and focusing reflected light onto the detected offset from source. The pick-up includes an aspherical single lens as a light focusing medium formed with a hologram reflective surface disposed on a centre of a medium surface and having a predetermined hologram pattern for reflecting an incident light toward an opposite medium surface and, at the same time, focussing onto points beside the source focal point, a diffracted spherical wave from the reflected light reflected in an optical information medium. A reflective mirror partially scans a light reflected from the hologram reflective surface of the aspherical single lens; and photodetector detects a light bounced off the hologram reflective surface of the aspherical single lens, thereby performing a reproducing/recording operation of optical information.

Module of light source having two wavelength and optical pickup apparatus for different type optical disk using this

본 발명은 광디스크를 광학적으로 억세스하는 광픽업 장치에 관한 것으로, 특히 파장이 다른 두 개 이상의 광빔들을 발생하는 이파장 광원모듈과 그를 이용한 이종 광디스크용 광픽업 장치에 관한 것이다. The present invention relates to an optical pickup apparatus for optically accessing an optical disc, and more particularly, to a two-wavelength light source module for generating two or more optical beams having different wavelengths and an optical pickup apparatus for heterogeneous optical discs using the same. 본 발명에 따른 이파장 광원모듈은 제1광빔을 발생하는 제1광원과, 제1광빔과 일정한 각도로 교차하도록 제1광빔과 다른 파장을 갖는 제2광짐을 발생하는 제2광원과, 제1광빔과 제2광빔의 교차점에 위치하여 상기 제1 및 제2광원들로부터 발생된 광빔의 진행 경로를 일치시키는 광경로 일체화 수단을 구비한다. The two-wavelength light source module according to the present invention includes a first light source for generating a first light beam, a second light source for generating a second light load having a wavelength different from that of the first light beam to intersect the first light beam at a predetermined angle, and a first light source. And an optical path integrating means positioned at an intersection point of the light beam and the second light beam so as to coincide the path of travel of the light beams generated from the first and second light sources. 본 발명에 따른 이파장 광원모듈을 이용한 이종 광디스크용 광픽업 장치는 홀로그램을 이용하여 두 개 이상의 서로 다른 파장의 광원을 일체화된 광원모듈로 패키징함으로써 조립 난이도를 감소시키고 제조가격을 절감할 수 있다. The optical pickup device for heterogeneous optical disks using the two-wavelength light source module according to the present invention can reduce the assembly difficulty and reduce the manufacturing cost by packaging two or more different light sources with an integrated light source module using a hologram.

Magneto-optical head device and recording / reproducing device

Optical scanning device

광학 주사장치는 수렴 빔이 통과해야 하는 서로 다른 두께의 투명층들을 갖는 기록매체를 주사하도록 구성된다. 이 장치의 대물렌즈는 제 1 투명층을 통해 주사하기 위한 수렴 빔을 형성하도록 설계된다. 제 2 투명층을 통해 주사할 때, 대물렌즈는 다른 공역 거리에서 동작하여, 작은 필드를 생성한다. 이와 같은 필드는, 대물렌즈에 입사된 방사빔 내부에 구면수차를 도입하고, 대물렌즈 내부의 이 구면수차를 보상함으로써 증가된다. The optical scanning device is configured to scan a recording medium having transparent layers of different thicknesses through which the converging beam must pass. The objective lens of the device is designed to form a converging beam for scanning through the first transparent layer. When scanning through the second transparent layer, the objective lens operates at different conjugate distances, creating a small field. This field is increased by introducing spherical aberration inside the radiation beam incident on the objective lens and compensating for this spherical aberration inside the objective lens. 광학 주사장치, 기록매체, 구면수차, 코마수차, 대물렌즈 Optical scanning device, recording medium, spherical aberration, coma aberration, objective lens

Optical pickup for DVDs compatible with CD-R using holographic ring lenses

개시된 내용은 정보의 기록 및 재생을 위하여 서로 다른 파장의 광들을 사용하는 적어도 두 종류의 광기록매체들에 호환하는 광픽업에 관한 것으로, 이 광픽업은 서로 다른 파장의 광들을 개별적으로 출사하는 두 개의 레이저광원들, 레이저광원들에서 출사하는 복수의 광원 중에서 하나 혹은 일부 파장에 대해서만 회절작용하는 하나의 홀로그램형렌즈, 홀로그램형렌즈를 통과한 광을 두 종류의 광기록매체의 정보기록면에 집광시키는 하나의 대물렌즈, 광기록매체의 정보기록면에서 반사되는 광을 광경로 변경하는 두 개의 광학소자 및 광학소자로부터 출력되는 광의 신호를 검출하는 두 개의 광검출기를 포함한다. 이와 같은 광픽업은 홀로그램형렌즈를 사용하여 광기록매체의 두께 변경시 발생하는 구면수차를 제거할 수 있으므로 광기록매체에 대한 호환이 가능하다. 또한, 홀로그램형렌즈의 구성제작이 용이하여 양산성이 우수한 잇점이 있다.

Optical pick-up head unit

一种兼容至少两种类型光学记录载体的光学拾取头装置，采用具有不同波长的光束来记录和读取信息。其中，该物镜被设计成最适合于较薄的光记录载体，并且该物镜的一侧表面设有由多个环形沟槽组成的环形全息环，而该全息环区域透过由第一光源发出的光束，而对由第二光源发出的光束透过该全息环区域时被衍射。这种光学拾取头装置消除了光学记录载体厚度不同产生的球差。

Optical disc master recording device

CD / DVD Disc Automatic Detection Device

본 발명은 광 픽업 장치에 관한 것으로, 특히 CD(Compact Disk) 및 DVD(Digital Video Disk)의 디스크를 광 픽업 장치에서 자동으로 확인하여 플레이할 수 있도록 하는 레이저 다이오드를 구동하라는 신호와 개구율을 조절하는 신호를 출력시켜주는 중앙처리장치(1)와; 상기 중앙처리장치(1)에 의해 포커싱 에러를 검출하여 출력시켜주는 포커싱 에러 검출부(3)와; 상기 중앙처리장치(1)의 개구율 조절 신호를 입력받아 렌즈의 개구율을 조절하는 개구율 조절부(7)와; 상기 포커싱 에러 검출부(3)의 신호를 입력받아 디스크의 종류를 판별하는 레벨 검출부(4)를 포함하여 구성된 것을 특징으로 하며, 이러한 본 발명은 사용자가 픽업 장치내에 디스크를 삽입시켜 놓고, 디스크의 종류를 판별하여 픽업 장치를 구동시키지 않아도 되는 효과가 있다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup device, and more particularly, to adjust a signal and an aperture ratio for driving a laser diode to automatically identify and play discs of a compact disk (CD) and a digital video disk (DVD). A central processing unit (1) for outputting a signal; A focusing error detector (3) for detecting and outputting a focusing error by the central processing unit (1); An aperture ratio adjustment unit 7 for receiving an aperture ratio adjustment signal of the central processing unit 1 and adjusting an aperture ratio of a lens; And a level detector (4) for receiving the signal of the focusing error detector (3) to determine the type of the disc. The present invention is characterized in that the user inserts the disc into the pick-up device, and the type of the disc. There is an effect that does not need to drive the pickup device by determining the.

Near field type optical storage medium and optical data storage system therefor

광학적 데이터저장시스템은 니어필드를 발생하는 고체함침렌즈 또는 고체함침광학계를 구비한 광픽업을 이용하여 광학적 저장매체에 정보를 쓰거나 읽는다. 광학적 저장매체는 고체함침렌즈 또는 고체함침광학계에 마주보는 광학적 투과층의 한 쪽 표면의 반대가 되는 다른 쪽 표면에 놓인 기록층을 구비한다. 광학적 투과층의 두께는 사용하는 광의 한 파장 보다 크며, 고체함침렌즈(또는 고체함침광학계)와 광학적 투과층의 표면들간의 간격은 사용하는 광의 한 파장보다 작다. 따라서, 본 발명은 에어갭 속이나 에어갭과 기록층사이의 저장매체 내부에서 반사되는 광빔이 기록층에서 반사되는 광빔에 노이즈로 작용하지 않게 한다. 또한, 본 발명은 광학적 저장매체의 외부표면이 되는 보호층 또는 기판의 두께를 두껍게 할 수 있으므로, 먼지나 흠집 등에 있는 경우에도 광학적 저장매체에 정보를 정확하게 쓰거나 읽어낼 수 있다.

Optical pickup

레이저원(레이저 다이오드), 다수의 광 소자, 빔 분할기, 집속 수단(마이크로렌즈) 및 수광 수단(광 다이오드)을 포함하는 광 픽업이 기술된다. 다수의 광 소자는 레이저 다이오드로부터 방출되는 레이저 빔을 광자기디스크상에 집속하고, 광자기 디스크로부터 반사된 레이저 빔을 수광 소자상에 집속한다. 빔 분할기는 제1표면에서 이 레이저 빔의 일부를 반사시키고, 제1표면에서 이 레이저 빔의 다른 일부를 굴절시킴으로써 레이저 다이오드로부터 방출되는 레이저 빔을 분할한다. 반사된 부분은 광 소자로 들어가고, 굴절된 부분은 빔 분할기를 통과하여 제2표면으로부터 출사된다. 마이크로렌즈는 이온 교환 방법에 의해 빔 분할기의 제2표면상에 일체로 형성된다. 또한, 마이크로렌즈는 제2표면으로부터 출사되는 빔을 집속한다. 수광 소자는 마이크로렌즈에 의해 집속되는 빔을 검출한다. 레이저원, 빔 분할기, 마이크로렌즈 및 수광 소자는 공통 기판상에 장착된다.

Dual Focus Optical Pickup

본 발명은 두께가1.2mm인 기존의 오디오 디스크와 두께가 0.6mm인 디지털 비디오 디스크에 기록된 정보를 하나의 프레넬 렌즈부를 통하여 선택적으로 읽어들일 수 있도록 하는 듀얼 포커스 광 픽업장치에 관한 것으로, 레이저빔을 발생하는 레이저 다이오드(10)와, 소정의 기울기를 갖도록 설치되고 일정한 비의 반사율과 투과율을 가져 입사광을 반사광과 투과광으로 분리하는 빔 스플리터(11)와, 상기 빔 스플리터(11)로부터 입사되는 광의 포커스가 서로 다른 위치에 형성되게 함으로써 오디오 디스크(12)와 비디오 디스크(13)이 기록된 정보를 선택적으로 읽어들일 수 있게 하는 제1프레넬 렌즈(14a), 제2프레넬 렌즈(14b)로 된 프레넬 렌즈부(14)와, 상기 빔 스플리터(11)를 통하여 입사되는 광정보를 전류로 변환시키는 광 검출기(15)로 이루어진다. ※ 선택도 제2도

Apparatus for detecting collimation state and angle of light beam and method for detecting focal position

Hologram storage consisting of dmd module for optical modulation

A hologram storage device including a DMD(Digital Micro Mirror Device) for optical modulation is provided to configure a total reflection prism so as to solve configurational difficulty and layout complexity which occur when a high-priced SLM(Spatial Light Modulator) is replaced with the low-priced DMD used for a projection TV or a beam projector. Beam splitters(502,507) split a light source(501) into a reference beam and an object beam. A DMD unit(504) changes the object beam into an object beam which includes predetermined data. An optical path converter(505) converts paths of the object beam incident from the DMD unit(504) and the object beam outputted from the DMD unit(504). A storage medium(521) records data by overlapping the reference beam with the object beam.

An optical focusing system generating near field

본 발명은 니어필드를 발생하는 집속광학계이다. 본 발명의 집속광학계는 입사되는 광빔을 굴절시키는 안쪽부분과, 반사되어 들어오는 광빔을 재반사시키는 바깥부분으로 된 제 1면, 및 제 1면의 안쪽부분에서 굴절된 광빔을 바깥부분으로 반사시키는 곡율을 갖는 곡면부분과, 바깥부분에서 반사된 광빔을 집광하여 니어필드를 형성하는 집광부분으로 된 제 2면을 포함하며, 곡면부분의 곡율에 따라, 반사되어 집광부분에 집속되는 광의 집속각도가 커지는 것을 특징으로 한다. 따라서, 본 발명은 집속광학계의 형상 및 재질을 크게 바꾸지 않고서도 미소스폿을 형성하여 기록밀도를 높일 수 있으며, 재료비 상승이나 조립공정의 어려움을 초래하지 않는다. The present invention is a focused optical system for generating near fields. The converging optical system of the present invention has a curvature for reflecting an inner portion for refracting an incident light beam, a first surface having an outer portion for rereflecting a reflected light beam, and a light beam refracted at an inner portion of the first surface to an outer portion. And a second surface comprising a curved portion having a light condensed portion and a light condensing portion condensing a light beam reflected from an outer portion to form a near field, and the focusing angle of the light reflected and focused on the condensing portion increases according to the curvature of the curved portion. It is characterized by. Therefore, the present invention can increase the recording density by forming a micro spot without greatly changing the shape and material of the focusing optical system, and does not cause an increase in material cost or difficulty in the assembly process.

Optical pickup device

광기록매체의 주트랙에 기록된 정보 재생시 인접트랙과의 간섭에 의한 크로스토크를 저감시킬 수 있도록 된 광픽업장치가 개시되어 있다. 이 개시된 광픽업장치는 주트랙과 인접트랙에 시간차없이 광스폿이 맺히도록 함과 아울러, 주트랙에 맺히는 광스폿의 편광성분과 인접트랙에 맺히는 광스폿의 편광성분이 서로 다르도록 하여 서로 다른 광수광부를 통해 주광과 보조광을 분리할 수 있도록 하고, 분리 수광되어 광전변환된 신호에 소정 연산상수를 승산하고 차동증폭함으로써 크로스토크를 저감할 수 있다. 여기서, 인접트랙에 광스폿이 시간차없이 맺히도록 하기 위하여 차폐판을 포함한 빔정형수단, 투과형/반사형 위상차프리즘을 채용한다.

Holographic memory

페이즈 마스크(phase mask)를 사용한 홀로그래픽 저장장치에 관한 것으로, 복수개의 셀들로 구성되고 참조광 및 물체광을 이용하여 정보를 기록하는 홀로그램 메모리부와, 일정 폭과 Y방향으로만의 길이를 가지며 표면으로부터 d = λ/(n-1)(여기서, d는 깊이, λ는 빛의 파장, n은 글래스의 굴절율)만큼 들어간 요철이 랜덤(random)하게 배열된 페이즈 마스크를 가지고 기록시 입사되는 물체광을 홀로그램 메모리부에 입사시키는 광변조부로 구성함으로써, 기록매질에 손상을 주지 않게 되며, 또한 종래 기술에서 발생한 다층기록시에 Y방향으로 푸리에 변환 패턴이 확산되는 단점도 해결할 수 있어 고용량의 정보 기록이 가능하게 된다. A holographic storage device using a phase mask, comprising: a hologram memory unit comprising a plurality of cells and recording information using a reference light and an object light; d = λ / (n-1) (where d is depth, λ is the wavelength of light, n is the refractive index of the glass). The optical modulator that enters the hologram memory unit does not damage the recording medium, and also solves the disadvantage that the Fourier transform pattern spreads in the Y direction when multi-layer recording occurs in the prior art, thereby enabling high capacity information recording. Done.

Optical storage medium

FIELD: data accumulation. SUBSTANCE: optical storage medium has substrate made of glass, polycarbonate, polymethyl methacrylate, and acrylate base resin having roughness structure with track-to-track space of 0.3 - 0.4 μm and groove depth of 50 - 800 Angstroms. Formed on substrate is reflecting layer made of aluminum, nickel, copper, platinum, silver, or gold, 500 - 2000 Angstroms in thickness; first insulating layer formed on reflecting layer and made of Si 3 N 4 or ZnZ-SiO 2 , 100 - 400 Angstroms in thickness; recording layer formed on first insulating layer and made of TbFeCo, NdTbFeCo, or TbFe, 150 - 400 Angstroms in thickness; second insulating later formed on recording layer and made of Si 3 N 4 0r ZnS-SiO 2 , 300 - 800 Angstroms in thickness; protective layer formed on second insulating layer and made of optically transparent inorganic material or organic material, its thickness being 5 - 100 μm; and lubricating film formed on protective layer, 1 - 3 nm thick, that does not enter in chemical reaction with protective layer. EFFECT: enhanced reliability of data storage. 1 cl, 12 dwg Эр сс ПЧ сэ (19) РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ ВИ "” 2 231 136. (51) МПК? 13) С2 С 11В 7/24 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 99108119/28, 15.04.1999 (24) Дата начала действия патента: 15.04.1999 (30) Приоритет: 18.09.1998 КК 98-38738 (46) Дата публикации: 20.06.2004 (56) Ссылки: ЕР 0855702 А2, 29.07.1998. ЕР 0549237 А2, 30.06.1993. ЕР 0724259 А2, 31.07.1996. ЕР 0409468 АЗ, 23.01.1991. МО 9741556 А, 06.11.1997. ЕР 0281756 А, 14.09.1988. УР 5/-200001 А, 08.12.1982. ЕР 0549236 А2, 30.06.1993. 4$ 5497359 А, 05.03.1996. ЕР О7277ГТГА, 21.08.1996. ЕР 0814468 А, 29.12.1997. ОЕ 4244268 А, 07.07.1994. 4Р 58177Ъ3Ъ А, 18.10.1983. ОЕ 4446325 А, 06.07.1995. 4$ 5615203 А, 25.03.1997. УР 10-22288Ъ5 А, 21.08.1998. $ 5627815 А, 06.05.1997. 4$ 5125750 А, 30.06.1992. 4$ 5129393 А, 17.03.1998. $4 980146 А, 07.12.1982. 54 1167650 А, 15.07. ...

Optical pickup apparatus for read/write heads in high density optical storages

본 발명에 따른 고밀도 광기록 및 재생용 광픽업 장치는 광을 생성, 출사하고 광기록 매체에서 방사되는 광을 수광하는 광모듈과, 광모듈로부터 출사한 빛을 집광시키는 집광용 대물렌즈와, 광기록 매체의 기판쪽에 근접되도록 상기 광기록 매체의 기판쪽에 향하는 제1면은 평면을 이루고 상기 광모듈을 향하는 제2면은 구면을 이루며 상기 광기록매체의 기판의 굴절률과 같은 굴절률을 가지는 고체 침지 렌즈를 포함한다. 집광용 대물렌즈로부터 나온 빛은 고체 침지 렌즈에 입사하여 굴절되고 광기록매체의 기판을 통과하여 상기 광기록 매체의 신호기록면에 결상되며, 이때 집광용 대물렌즈의 주면에서 상기 고체 침지 렌즈의 제1면까지의 거리(L0)는다음과 같다. L0 = f - (n1 2 - n0 2 )R/(n1 n0) - t (여기서 f는 집광용 대물렌즈의 초점거리, R은 고체 침지 렌즈의 반경, n1은 고체 침지 렌즈의 굴절률, n0는 공기 굴절률, t는 광기록매체의 두께임.)

Method for reproducing optical disc

一种能够从多个光学系统中选择并设定了操作状态的光学系统切换信号处理系统。系统控制单元100根据光盘11的种类最终地设定适宜的光学系统。并设定对应于该所设定的光学系统的适宜的信号处理系统，设定对应于CD和DVD的适宜的模式。

Pickup device on the holographic digital data system

본 발명은 홀로그래픽 디지털 데이터 시스템의 재생 장치에 관한 것으로, 특히 기준광을 일정 각도로 반사시켜 저장 매체에 입사시키는 회전 미러와, 저장 매체를 통해 투과된 기준광을 편광시키는 편광 변환부와, 편광 변환부에서 변환된 기준광을 다시 편광 변환부에 반사시키는 미러와, 저장 매체 앞단에 설치되며 편광 변환부에서 전달된 기준광에 의해 저장 매체에 기록된 데이터가 재생될 경우 재생광을 반사시키는 광 분리기와, 광 분리기에서 반사된 재생광을 전기적인 데이터로 변환하는 CCD를 포함한다. 그러므로 본 발명은 저장 매체 뒤편에 위치한 광 재생용 광학 장치인 푸리에 렌즈 및 CCD의 위치를 저장 매체 앞편으로 위치시키고 저장 매체 뒤편에 편광 변환기와 제 2미러를 추가함으로써 저장 매체에 기록된 데이터를 안전하게 재생할 수 있다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproduction apparatus of a holographic digital data system, and more particularly, a rotation mirror for reflecting a reference light at a predetermined angle to be incident on a storage medium, a polarization conversion unit for polarizing the reference light transmitted through the storage medium, and a polarization conversion unit. A mirror for reflecting the reference light converted by the back light into the polarization converting unit, an optical splitter installed at the front end of the storage medium and reflecting the reproduction light when data recorded on the storage medium is reproduced by the reference light transmitted from the polarizing converting unit, And a CCD that converts the reproduced light reflected by the separator into electrical data. Therefore, the present invention securely reproduces the data recorded on the storage medium by placing the positions of the Fourier lens and the CCD, the optical device for optical reproduction located behind the storage medium, in front of the storage medium and adding a polarization transducer and a second mirror behind the storage medium. Can be. 홀로그래픽 디지털 데이터, 재생 장치, 편광 변환, 광 분리기 Holographic digital data, playback device, polarization conversion, optical separator

Optical head apparatus

본 발명은 상이한 두께를 가지는 광 디스크 상에 신호를 안정하게 기록 또는 재생하는 광 헤드 장치에 관한 것이다. 광축으로부터 이격된 부분에서 광강도를 감소시키거나 광경로 길이를 변경하기 위해 보정 홀로그램 부품 또는 보정 필터가 광원과 2초점 렌즈 사이에 제공된다. 보정 홀로그램 부품 또는 보정 필터를 통과하는 광은 2초점 렌즈에 의해 광 디스크 상에 마이크로 스폿으로서 집광된다. 2초점 렌즈는 광빔의 일부를 회절시키는 홀로그램 렌즈와 대물렌즈를 포함한다. The present invention relates to an optical head apparatus for stably recording or reproducing a signal on an optical disk having a different thickness. A correction hologram component or correction filter is provided between the light source and the bifocal lens to reduce the light intensity or change the optical path length at a portion away from the optical axis. Light passing through the correction hologram component or correction filter is collected as a micro spot on the optical disk by a two-focal lens. Bifocal lenses include holographic lenses and objective lenses that diffract a portion of the light beam.

Optical disc apparatus for finding a tracking error for an optical disk

An optical disc apparatus capable of mounting an optical disc includes a light source for emitting light; an objective lens for collecting the light emitted by the light source on the optical disc; a first light distribution section integrally movable with the objective lens, the first light distribution section including a first area and a second area, the first light distribution section outputting the light reflected by the optical disc and transmitted through the first area or the second area as transmission light, outputting the light reflected by the optical disc and diffracted by the first area as first diffraction light, and outputting the light reflected by the optical disc and diffracted by the second area as second diffraction light; a transmission light detection section for detecting the transmission light and outputting a TE1 signal indicating an offset of the detected transmission light; a first diffraction light detection section for detecting the first diffraction light and the second diffraction light, and outputting a TE2 signal indicating a difference between a light amount of the detected first diffraction light and a light amount of the detected second diffraction light; and a control device for generating a tracking error signal for the optical disc based on the TE1 signal and the TE2 signal.

Near field type optical storage medium and optical data storage system therefor

광학적 데이터저장시스템은 니어필드를 발생하는 고체함침렌즈 또는 고체함침광학계를 구비한 광픽업을 이용하여 광학적 저장매체에 정보를 쓰거나 읽는다. 광학적 저장매체는 고체함침렌즈 또는 고체함침광학계에 마주보는 광학적 투과층의 한 쪽 표면의 반대가 되는 다른 쪽 표면에 놓인 기록층을 구비한다. 광학적 트과층의 두께는 사용하는 광의 한 파장 보다 크며, 고체함침렌즈(또는 고체함침광학계)와 광학적 투과층의 표면들간의 간격은 사용하는 광의 한 파장보다 작다. 따라서, 본 발명은 에어갭 속이나 에어갭과 기록층사이의 저장매체 내부에서 반사되는 광빔이 기록층에서 반사되는 광빔에 노이즈로 작용하지 않게 한다. 또한, 본 발명은 광학적 저장매체의 외부표면이 되는 보호층 또는 기판의 두께를 두껍게 할 수 있으므로, 먼지나 흠집 등에 있는 경우에도 광학적 저장매체에 정보를 정확하게 쓰거나 읽어낼 수 있다.

Optical pickup

레이저 원 (레이저 다이오드), 복수 개의 광학 소자, 빔 분할기, 집광 수단(마이크로렌즈), 및 광 검출기 (광 다이오드)를 포함하는 광 픽업이 개시된다. 복수개의 광학 소자는 레이저 다이오드로부터 방출된 레이저 빔을 광자기 디스크 상에 집속하고, 광자기 디스크로부터 반사된 레이저 빔을 광 검출기 상에 접속한다. 빔 분할기는 레이저 다이오드로부터 방출된 레이저 빔을, 그 일부는 제1 표면에서 반사시키고, 그 다른 일부는 상기 제1 표면에서 굴절시킴으로써 분할한다. 반사된 빔은 광학 소자에 입력되고, 굴절된 빔은 빔 분할기를 통과하여 제2 표면으로부터 출사된다. 마이크로렌즈는 이온 교환 방법에 의해 빔 분할기의 제2 표면 상에 일체고 형성된다. 또한, 마이크로렌즈는 제2 표면으로부터 출사된 빔을 접속한다. 광 다이오드는 마이크로렌즈에 의해 접속된 빔을 검출한다. 레이저 원, 빔 분할기, 마이크로렌즈, 및 광 검출기는 공통 기판 상에 장착된다. An optical pickup is disclosed that includes a laser source (laser diode), a plurality of optical elements, a beam splitter, a light collecting means (microlens), and a photo detector (photodiode). The plurality of optical elements focus the laser beam emitted from the laser diode on the magneto-optical disk, and connect the laser beam reflected from the magneto-optical disk on the light detector. The beam splitter splits the laser beam emitted from the laser diode by reflecting a portion of it at a first surface and refracting the other at the first surface. The reflected beam is input to the optical element, and the refracted beam passes through the beam splitter and exits from the second surface. The microlenses are integrally formed on the second surface of the beam splitter by the ion exchange method. In addition, the microlenses connect the beams emitted from the second surface. The photodiode detects beams connected by microlenses. The laser source, beam splitter, microlens, and light detector are mounted on a common substrate.

Immersion system

본 발명은 구 세그먼트형 렌즈(3)를 포함하는 자기 광학 저장 장치용 침지 시스템에 관한 것이다. 상기 렌즈(3)는 저장 장치에 사용되는 파장(λ)의 전자기 광선(2)에 대한 투과성, 및 공기 보다 높은 제 1 굴절률(n 1 )을 가진 재료, 특히 반도체 재료로 이루어진다. 바람직한 실시예에서, 전자기 광선(2)이 퍼지는 방향으로 볼때 렌즈(3) 다음에 고굴절 층(4)이 배치된다. 상기 층(4)은 렌즈(3) 재료의 제 1 굴절률(n 1 ) 보다 높은 제 2 굴절률(n 2 )을 가진 재료로 이루어진다. The present invention relates to an immersion system for a magneto-optical storage device comprising a segmented lens (3). The lens 3 is made of a material, especially a semiconductor material, having a transmittance of the wavelength? Of the wavelength? Used in the storage device to the electromagnetic ray 2 and a first refractive index n 1 higher than air. In a preferred embodiment, the high refractive index layer 4 is disposed after the lens 3 in the direction in which the electromagnetic rays 2 are spread. The layer (4) is made of a material having a second refractive index (n 2 ) higher than the first refractive index (n 1 ) of the material of the lens (3).

Optical pickup device and wavelength selective diffraction grating

본 발명에 따른 광픽업 장치는 파장 635nm의 레이저 광 및 파장 780nm의 레이저 광을 선택적으로 생성하는 2파장 반도체 레이저(23)와, 콜리메이터 렌즈(24)와, 콜리메이터 렌즈(24)의 표면 상에 형성된 홀로그램(25)와, 환형 편광 영역(40)을 갖는 편광 유리(22)와, 대물 렌즈(21)를 구비한다. 홀로그램(25)은 파장 635nm의 레이저 광을 회절시키지 않고, 파장 780nm의 레이저 광을 외측으로 회절시킨다. 그 때문에, 파장 780nm의 레이저 광의 가상광원이 파장 635nm의 레이저 광의 광원보다도 콜리메이터 렌즈(24)에 접근한다. 따라서, 대물 렌즈(21)는 파장 635nm의 레이저 광을 DVD의 투명 기판(31)의 기록면 상에 집결시키고, 파장 780nm의 레이저 광을 CD-R의 투명 기판(32)의 기록면 상에 집결시킨다. 이에 따라, 이 광픽업 장치는 투명 기판의 두께가 다른 DVD 및 CD-R 모두에 기록된 데이타를 재생시킬 수 있다. The optical pickup apparatus according to the present invention comprises a two-wavelength semiconductor laser 23 for selectively generating a laser beam having a wavelength of 635 nm and a laser beam having a wavelength of 780 nm, a collimator lens 24 and a collimator lens 24 formed on the surface of the collimator lens 24 A hologram 25, a polarizing glass 22 having an annular polarization region 40, and an objective lens 21. The hologram 25 diffracts the laser beam having the wavelength of 780 nm outward without diffracting the laser beam having the wavelength of 635 nm. Therefore, the virtual light source of the laser light having the wavelength of 780 nm approaches the collimator lens 24 more than the light source of the laser light having the wavelength of 635 nm. Therefore, the objective lens 21 collects laser light having a wavelength of 635 nm on the recording surface of the DVD's transparent substrate 31, and collects laser light having a wavelength of 780 nm on the recording surface of the CD-R's transparent substrate 32. Thus, this optical pickup apparatus can reproduce data recorded on both DVDs and CD-Rs having different thicknesses of the transparent substrate.

Optical scanning unit having a main lens and an auxiliary lens

The invention relates to an optical scanning device for scanning an optically readable record carrier (1). The scanning device includes a radiation source (5), a radiation-sensitive detection system (7), and an optical scanning unit for focusing a scanning beam (3) produced by the radiation source to a scanning spot (9) on the record carrier. The scanning unit inlcuding a lens system having an optical axis (13), which lens system comprises a first lens unit having a main lens (15) and a second lens unit having an auxiliary lens (17). The scanning device further includes a first detection means involved in detection of the main lens with respect to the record carrier, and a second detection means involved in detection of the auxiliary lens. The scanning unit further includes a first electrical drive unit for moving the first lens unit in dependence upon a signal supplied by the first detection means, and a second electrical drive unit for moving the second lens unit with respect to the main lens in dependence upon a signal supplied by the second detection means. The second drive unit comprises a first part and a second part which cooperates with the first part via an air gap (51). The first part is secured to the first lens unit and the second part is secured to the second lens unit. In order to counteract spherical aberration and/or coma and/or astigmatism during scanning the second detection means includes a position and orientation detector system for detecting the position and orientation of the auxiliary lens with respect to the record carrier during scanning.

Subminiature dual focus optical pick-up device

본 발명은 광 디스크 플레이어에서 디스크에 기록된 정보를 읽어들이는 광 픽-업에 관한 것으로서, 특히 모든 광학계를 실리콘기판에 초소형 박막형으로 일체로 구성하여 두께가 서로 다른 두 종류의 디스크에 기록된 정보를 읽어들일 수 있도록 함으로서 조립 및 조정의 용이성과 경박단소화에 기여할 수 있도록 하는 초소형 광 픽-업 장치에 관한 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to optical pick-up for reading information recorded on a disc in an optical disc player. In particular, all optical systems are integrally formed on a silicon substrate in an ultra-thin thin film so as to record information recorded on two different types of discs. The present invention relates to an ultra-compact optical pick-up device that can contribute to ease of assembly and adjustment and light weight and shortening. 이를 위하여 다수의 광학소자가 집적 형성되는 실리콘기판과, 상기 실리콘기판의 일측 중앙부에 형성되어 소정의 발진파장으로 레이저 빔을 방출하는 레이저 다이오드, 상기 레이저 다이오드 하측에 집적 형성되어 디스크로부터 돌아오는 광정보를 검출하는 광검출기, 상기 실리콘기판 상부의 소정부분에 형성되어 상기 레이저 다이오드로부터 방사되는 레이저 빔을 평행광으로 유지하여 반사하는 제 1 프레즈넬렌즈, 상기 실리콘기판 상부 일측에 형성되어 레이저 빔을 집광하여 두께가 다른 디스크상에 서로 다른 빔 포커스를 형성하는 듀얼 포커스 대물렌즈, 상기 실리콘기판 중앙부의 소정위치에 형성되어 제 1 플레즈넬렌즈에 의해 반사된 레이저 빔을 소정비율로 투과 및 반사시켜 상기 듀얼 포커스 대물렌즈로 조사하는 빔 스플리트, 상기 실리콘기판 하부의 소정위치에 형성되어 상기 빔 스플리트로 투과하는 광정보를 이용해 포커스에러를 발생시켜 광검출기로 조사하는 제 2 프레스넬렌즈로 이루어진 것이다. To this end, a silicon substrate in which a plurality of optical elements are integrally formed, a laser diode formed at a central portion of one side of the silicon substrate to emit a laser beam at a predetermined oscillation wavelength, and optical information formed integrally under the laser diode and returned from a disk A photodetector for detecting a first fresnel lens formed on a predetermined portion of the upper side of the silicon substrate to reflect and maintain a laser beam emitted from the laser diode as parallel light, and formed on one side of the upper side of the silicon substrate to collect a laser beam The dual focus objective lens to form different beam focus on the disk having different thicknesses, and the laser beam formed at a predetermined position in the center ...

Optical head

Optical reader for data stored on optical disc

The optical reader has mechanism for producing a beam of light, and an optical device for partial transmission of the beam onto the optical disc. A lens (230) is provided to focus a beam of light from an optical source onto the surface of the optical disc (240) and also to cause convergence of the beam of light reflected from the disc surface onto a reflecting surface (224). The reflecting surface directs the reflected light at right angles to its angle of incidence. The reflected light falls onto a curved reflector (250) that causes it to converge to a point on a detector which is positioned adjacent to the light source (210) to assist in the compact construction of the reader.

Magneto-optical head device having integrated auxiliary lens and magnetic reproducing haed and recording and reproducing device using magneto-optical head device

광자기 헤드 장치는 광원(1), 광원(1)에서 방출된 광 빔을 집광하는 대물 렌즈(5), 광 빔으로 기록 매체(8)가 조사되도록 대물 렌즈(5)에 의해 집광된 광 빔의 유효 개구수를 변환하는 보조 렌즈(6), 및 보조 렌즈(6)와 일체화된 자기 재생 헤드(7, 72)를 구비한다. 따라서, 자기 재생 헤드(7, 72)가 보조 렌즈(6)와 일체화되므로, 광자기 헤드 장치의 크기를 줄일 수 있고, 디스크의 양면에서 정보를 재생할 수 있다. 또한, 기록 매체(8)로서 열자기 기록 매체를 채용할 때, 광자기 헤드 장치는 높은 트랙 밀도 및 높은 선 밀도로 기록된 정보를 재생할 수 있다. The magneto-optical head device includes a light source 1, an objective lens 5 for condensing the light beam emitted from the light source 1, and a light beam focused by the objective lens 5 so that the recording medium 8 is irradiated with the light beam. And an auxiliary lens 6 for converting the effective numerical aperture of? And magnetic reproducing heads 7 and 72 integrated with the auxiliary lens 6. Therefore, since the magnetic reproduction heads 7 and 72 are integrated with the auxiliary lens 6, the size of the magneto-optical head device can be reduced, and information can be reproduced from both sides of the disc. Further, when employing a thermomagnetic recording medium as the recording medium 8, the magneto-optical head apparatus can reproduce information recorded at high track density and high line density.

MULTI-FOCUS OPTICAL READING SYSTEM FOR REPRODUCING INFORMATION RECORDED ON OPTICAL DISCS

La présente invention concerne un système de lecture optique à focalisation multiple pour reproduire des signaux d'information mémorisés sur des disques optiques. Selon l'invention, le système est caractérisé en ce qu'il comprend des moyens (216, 206, 208) pour produire un faisceau lumineux parallèle; un dispositif optique (210) pourvu de seconde et première parties (211, 213), une portion du faisceau lumineux parallèle frappant la première partie étant focalisée sur un premier disque optique (215) et la portion restante de ce faisceau frappant la seconde partie étant focalisée sur un second disque optique (217); et un moyen de détection (202) pour lire le signal d'information du disque optique respectif. L'invention trouve application pour lire à la fois des disques optiques mince et épais. The present invention relates to a multiple focusing optical reading system for reproducing information signals stored on optical discs. According to the invention, the system is characterized in that it comprises means (216, 206, 208) for producing a parallel light beam; an optical device (210) provided with second and first parts (211, 213), a portion of the parallel light beam striking the first part being focused on a first optical disc (215) and the remaining portion of this beam striking the second part being focused on a second optical disc (217); and detecting means (202) for reading the information signal from the respective optical disc. The invention finds application for reading both thin and thick optical discs.

MULTI-FOCUS OPTICAL READING SYSTEM FOR REPRODUCING INFORMATION RECORDED ON OPTICAL DISCS

Optical head unit

본 발명은 두께가 다른 광학 디스크에 신호를 안정하게 기록하거나 재생시키는 광학 헤드장치에 관한 것이다. 보정 홀로그램 소자 또는 보정필터가 광학축으로부터 떨어진 부분에서 광학 강도를 감소시키거나 광학 통로 길이를 변경시키기 위해 광원과 2촛점렌즈 사이에 제공된다. 보정 홀로그램 소자 또는 보정필터를 통과하는 광은 광학 디스크의 마이크로 스폿으로 2촛점렌즈에 의해 수렵된다. 2촛점렌즈는 광비임의 부분을 회절시키는 홀로그램 렌즈와 대물렌즈를 포함한다.

Patent FR2403575B1

Object lens for optical head

(57)【要約】 【課題】 温度変化による波面収差の変化を小さく抑 え、高ＮＡの対物レンズとして利用する場合にも、利用 可能な温度範囲を広げることができる光ヘッド用対物レ ンズを提供することを課題(目的)とする。 【解決手段】 対物レンズ１０は、両面が凸の非球面で ある樹脂製単レンズであり、一方のレンズ面１１に光軸 を中心とした輪帯状のパターンとして回折レンズ構造が 形成されている。回折レンズ構造は、入射光の波長が長 波長側にシフトした際に、球面収差が補正不足となる方 向に変化するような球面収差特性を有している。

Apparatus for controlling track servo in a holographic digital data storage system

본 발명은 홀로그래픽 디지털 데이터 저장 시스템을 위한 트랙 서보 제어 장치에 관한 것으로, 초기 트래킹 패턴이 형성된 홀로그래픽 기록 매체의 기록물질층과 반응하는 파장 대역을 갖는 제 1 광을 데이터 기록을 위한 신호광으로 변조하여 기록 매체에 입사시키는 제 1 광학계와, 제 1 광을 데이터 기록 또는 재생을 위한 기준광으로 하여 기록 매체에 소정 각도로 입사시키는 제 2 광학계와, 기록물질층과 반응하지 않는 파장 대역을 갖는 제 2 광을 트랙광으로 하여 초기 트래킹 패턴 또는 데이터 패턴에 입사시키는 제 3 광학계와, 초기 트래킹 패턴 또는 데이터 패턴에 의해 회절된 트랙광을 검출하는 광 검출기와, 광 검출기에 의한 광 검출값에 의거하여 초기 트래킹 패턴 또는 데이터 패턴의 정확한 위치를 인식한 후 초기 트래킹 패턴 또는 데이터 패턴과 일정 간격을 둔 위치에 기준광이 입사되도록 제어하여 데이터 기록 또는 재생 위치를 조정하는 트래킹 서보 제어를 수행하는 제어부를 포함하며, 초기 트래킹 패턴만 형성하여 두면 이후 서클부터는 이전 서클의 데이터 패턴을 이용하여 트랙 서보 제어를 수행하므로 트랙 방향으로의 다중화 기록이 가능하여 홀로그래픽 기록 매체의 기록 밀도가 향상되고, 기록시에 이전 서클의 데이터 패턴을 트랙 서보 제어에 이용하므로 서클 데이터 패턴의 기록 정도를 간접적으로 파악할 수 있는 이점이 있다. The present invention relates to a track servo control apparatus for a holographic digital data storage system, wherein a first light having a wavelength band that reacts with a recording material layer of a holographic recording medium having an initial tracking pattern is modulated into a signal light for data recording. A first optical system incident on the recording medium, a second optical system incident on the recording medium at a predetermined angle using the first light as a reference light for data recording or reproduction, and a second wavelength band not reacting with the recording material layer. A third optical system that enters light into the initial tracking pattern or data pattern as the track light, an optical detector that detects the track light diffracted by the initial tracking pattern or data pattern, and an initial stage based on the light detection value by the light detector Initial tracking pattern or data after recognizing the exact location of the tracking pattern or data pattern It includes a control unit that performs tracking servo control to adjust the data recording or reproducing position by controlling the reference light to be incident at a predetermined distance from the turn.If only the initial tracking pattern is formed, the subsequent circle uses ...

Single-frequency laser source for optical data storage system

An optical data storage system utilizes optical fibers (102) for transfer of information to and from storage media (107). The storage media (107) includes magneto-optical storage disks. The optical fibers (102) are single-mode polarization maintaining optical fibers. A single frequency laser diode (231) provides a source of polarized light. Accordingly, a polarization state conveyed by the polarization maintaining optical fiber (102) is accurately reproduced with reduced noise, as compared to use of a Fabry-Perot laser diode.

Optical disc apparatus

Apparatus for processing optical information, method of recoding and reading optical information thereof

본 발명은 광정보 처리장치 및 이를 이용한 광정보 기록방법과 재생방법에 관한 것으로, 본 발명의 광정보 처리장치는 광원, 상기 광원에서 제공되는 기준광을 광정보 저장매체로 다중 각도로 입사 안내하는 기준광 광학계, 상기 저장매체에서 상기 기준광과 동축이며 상기 기준광의 진행방향과 반대방향으로 재생한 재생광을 검출하는 광정보 검출기를 구비하여 신호광과 기준광이 동축 상에서 서로 반대방향으로 입사되고, 신호광과 기준광을 하나의 렌즈에서 공간적으로 분리할 필요가 없기 때문에 고개구수의 대물렌즈를 사용하지 않아도 되어 광정보 처리장치의 제조비용을 절감할 수 있고, 또한 기준광 입사각도의 다중화 범위가 보다 넓어지게 되는 효과가 있고, 또한 다양한 각도로 기준광을 다중화함으로써 광정보의 다중화 밀도를 보다 높일 수 있고, 광정보의 재생시에는 기준광의 산란에 의한 노이즈가 광정보 검출기에 거의 검출되지 않게 되어 광정보의 재생효율이 더욱 향상되는 효과가 있다. The present invention relates to an optical information processing apparatus, and an optical information recording method and a reproducing method using the optical information processing apparatus. The optical information processing apparatus according to the present invention provides a light source and a reference light for guiding an incident light provided by the light source at multiple angles to an optical information storage medium. An optical system and an optical information detector for detecting the reproduction light reproduced in the opposite direction to the traveling direction of the reference light in the optical medium and the storage medium, the signal light and the reference light is incident in opposite directions on the coaxial, and the signal light and the reference light Since there is no need to separate spatially from one lens, it is not necessary to use a high-aperture objective lens, thereby reducing the manufacturing cost of the optical information processing device, and also increasing the multiplexing range of the reference light incident angle. In addition, by multiplexing the reference light at various angles, When the optical information is reproduced, the noise due to scattering of the reference light is hardly detected by the optical information detector, so that the reproduction efficiency of the optical information is further improved.

Reproduction device for optical disks

Signal processing systems can be switched according to the optical system selected from a plurality of optical systems and set to the operating state. A system controlling portion 100 finally sets an appropriate optical system according to the kind of an optical disk 11, and sets an appropriate signal processing system corresponding to the set optical system for setting an appropriate mode depending upon CD (compact disk) or DVD (high density recording disk).

Optical element

An optical element (16) introduces a first wavefront deviation when a first radiation beam having a first wavelength passes through it and a second wavefront deviation when a second radiation beam having a second wavelength different from the first wavelength passes through it. One surface of the optical element comprises a phase structure in the form of annular areas (52, 53, 54, 55), the areas forming a non-periodic pattern of optical paths of different length. The optical paths for the first wavelength form the first wavefront deviation and the optical paths for the second wavelength form the second wavefront deviation, the difference between the two deviations being proportional to the difference between the first and second wavelength.

Pickup device for reproducing information recording medium

(57)【要約】 【課題】 本発明は、信号のクロストークを小さく抑え ることのできる情報記録媒体の再生用ピックアップ装置 を提供することを課題としている。 【解決手段】 一層目のフォーカス時に二層目から得ら れる受信信号は、デフォーカススポット面積に相当する 全光量の内、ＰＤ受光部面積に相当する光量に比例す る。又、一層目からの受信信号は、フォーカススポット により形成されるＰＤ受光部面積に相当する全光量に比 例するが、該全光量は一層目がデフォーカ状態となって も変わらない。従って、デフォーカススポットの面積π ｒ d 2 に対するフォーカススポットの面積πｒ f 2 の比 は、一層目の受信信号に対する二層目の受信信号の比と なり、フォーカスエラー信号のＳ字間隔をＳ、情報記録 層の層間間隔をｄとして、これを計算するとπｒ f 2 ／ πｒ d 2 ＝（Ｓ／２ｄ’） 2 となるので、２０ｌｏｇ （Ｓ／２ｄ’） 2 ≦−２０となるように光学系を設計す れば、十分なビット誤り率を得る事ができる。

Optical scanning device and process

Photoelectronic device

An optoelectronic device that provides an excellent reproduction signal and a stable servo control while preventing deterioration of S/N ratio caused by stray light. The optoelectronic device has a semiconductor laser (101) that emits light beams on an information-recording medium (105), a hologram optical element (102) having a diffraction grating region (108) and located between the semiconductor laser (101) and the information-recording medium (105), and a photodetector (106) for receiving light that is diffracted at the diffraction grating region (108) of the hologram optical element (102), among returning light beams from the information-recording medium (105), and the optoelectronic device has also a diffraction grating region (107) in the vicinity of the diffraction grating region (108) of the hologram optical element (102) so as to prevent stray light other than diffracted light from the diffraction grating region (108) from entering the photodetector (106).

Optical recording method, optical recording apparatus and optical recording medium

The intensity of an ultraviolet laser beam emitted from a UV laser beam source (1) is modulated based on additional information by an optical modulator (2), and directed to a mirror (14) through lenses (3, 4), a phase diffraction grating (5) and a half mirror (14). The laser beam is reflected from the mirror (14), focused by an objective lens (6) and then made to fall on an optical disc (8). Alternatively, an ultraviolet laser beam from a UV laser beam source (1) enters a phase diffraction grating through an optical modulator (2) and lenses (3, 4) and is divided into three beams by the phase diffraction grating (5). The three beams are applied to the optical disc (8) through a half mirror (11), a mirror (14) and an objective lens (6). Reflected light of visible laser beam from the optical disc (8) enters a half mirror (11), and is then reflected therefrom to enter an optical detector (13) through a cylindrical lens (12). The focusing control and tracking control are carried out on the basis of the output signal from this optical detector (13), whereby it is possible to form a spot of the ultraviolet laser beam in an accurate position in an additional information recording region and record the additional information thereon accurately.

Optical pick-up head device

一种兼容至少两种类型光学记录载体的光学拾取头装置,采用具有不同波长的光束来记录和读取信息。其中,物镜一侧表面上设有环形全息环,第一光源发出的光束透过该全息环区域,第二光源发出的光束在透过该全息环区域时被衍射;所述第一光源发出的光束聚焦于第一种光记录载体的信息记录面上形成一光点,而所述第二光源发出的光束聚焦于第二种光记录载体的信息记录面上形成一光点。这种光学拾取头装置消除了光学记录载体厚度不同产生的球差。

Objective lens, and optical pickup device using the objective lens

An objective lens used for an optical pickup device having a numerical aperture (NA) of 0.7 or larger, comprising a plurality sheets of lenses, wherein the plurality sheets of lenses (1) and (2) are fixed to the inside of a cylindrical lens holder (3) in such a manner that, with one lens (1) used as a reference, the other lens (2) is positioned.

Optical recording medium and optical disk device

(57)【要約】 【課題】 高記録容量化可能な光記録媒体を提供する。 【解決手段】 熱可塑性樹脂からなり、０．３〜１．２ ｍｍの厚さの支持体と、支持体上に案内溝と、案内溝上 に、順に、少なくとも反射膜と、有機色素記録層からな る情報記録層と、１０〜１７７μｍの厚さの光透過層が 形成されて成り、光透過層の、厚さむらをΔｔとしたと きに、再生、もしくは記録再生する光学系のＮ．Ａ．お よび波長λとの間に、 Δt ≦±５．２６( λ／Ｎ．Ａ． 4 ）（μｍ） （Ｎ． Ａ．は開口数） の関係を満たすようにする。

Compound objective lens having two focal points and apparatus using the lens

A compound objective lens is composed of a hologram lens for transmitting a part of incident light without any diffraction to form a beam of transmitted light and diffracting a remaining part of the incident light to form a beam of first-order diffracted light, and an objective lens for converging the transmitted light to form a first converging spot on a front surface of a thin type of first information medium and converging the diffracted light to form a second converging spot on a front surface of a thick type of second information medium. Because the hologram lens selectively functions as a concave lens for the diffracted light, a curvature of the transmitted light differs from that of the diffracted light. Therefore, even though the first and second information mediums have different thicknesses, the transmitted light incident on a rear surface of the first information medium is converged on the its front surface, and the diffracted light incident on a rear surface of the second information medium is converged on the its front surface. That is, the compound objective lens has two focal points.