Vorrichtung zur magnetooptischen Aufzeichnung und Wiedergabe

Optisches Bauteil und damit versehenes optisches Wiedergabegerät.

Optische Abtasteinrichtung

OPTISCHE ABTASTEINHEIT UND OPTISCHES WIEDERGABEGERÄT

Vorrichtung zur Feststellung des Polarisationszustands eines optischen Wellenzugs.

Optischer Kopf.

Signalwiedergabegerät für optische Aufzeichnungs- und Wiedergabeapparatur und Methode für dasselbe.

OPTISCHE ABTASTVORRICHTUNG

OPTICAL SYSTEM FOR OPTICAL DISK DEVICES

Optical system for optical disk drive

An optical system for an optical disk drive for reading/writing data from/in an optical disk includes a light source (7) emitting a parallel laser beam (P) to be incident on a deflector (26) having a mirror surface rotatable about an axis (01). The parallel laser beam is deflected towards an objective lens system (10) which faces an optical disk (2). A relay lens system (29, 30) is provided between the deflector and the objective lens system such that the mirror surface and a mirror side principal plane (S'1) of the objective lens system have a substantially conjugate relationship.

PROCEDURE FOR DAEMPFUNG THE NOISE FOR AN OPTICAL SWEEP DEVICE.

Optical head, light-emitting/receiving device, and apparatus for recording/reproducing optical recording/recorded medium

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 MICROSWITCH HAVING ELECTROSTATIC MICROACTUATOR AND METHOD FOR USE THEREOF

An optical microswitch (104) for use with a laser beam that extends along a path comprising a body (213) having an inlet port (150) adapted to receive the laser beam and a plurality of outlet ports (151). A plurality of mirrors (103) coupled to a plurality of micromotors (180a, 180b) are carried by the body. The micromotors selectively move the mirrors from a first position out of the path of the laser beam to a second position into the path of the laser beam to direct the laser beam to one of the outlet ports. Each of the micromotors has at least one electrostatically-driven comb assembly therein for moving the respective mirror to one of the first and second positions. A controller is electrically coupled to the micromotors for providing control signals to the micromotors.

Optical signal detection circuit

Systeme de memorisation a lecture/ecriture optique et appareil pour lire et/ou ecrire sur un support souple des donnees pouvant etre detectees optiquement

L'invention concerne un systeme de memorisation par lecture/ecriture, destine a lire et ecrire des donnees, pouvant etre detectees optiquement, sur un support optique ou magneto-optique souple. Il comprend une tete de lecture/ecriture optique pouvant etre amenee par un bras 30 au-dessus d'un support souple sur lequel elle applique une lumiere focalisee et de laquelle elle recoit la lumiere reflechie. Les moyens de stabilisation fine sont places a proximite du support souple pour stabiliser ce dernier dans une position souhaitee afin qu'il ne soit pas necessaire a la tete optique de se rapprocher ou s'eloigner sensiblement du support pour maintenir la lumiere focalisee sur ce dernier. Domaine d'application : systemes de memorisation optiques d'informations, etc.

PROCEDE OPTO-ELECTRONIQUE DE LECTURE D'INFORMATIONS CONTENUES SUR UN SUPPORT MAGNETIQUE ET CIRCUIT POUR LE METTRE EN OEUVRE

PROCEDE OPTO-ELECTRONIQUE DE LECTURE DES INFORMATIONS CONTENUES SUR UN SUPPORT MAGNETIQUE SM SUR UNE PLURALITE DE PISTES, RECEVANT LES INFORMATIONS SOUS FORME D'UNE PLURALITE DE TACHES LUMINEUSES IDI PROJETEES SUR UN PLAN P OU SONT DISPOSES UNE PLURALITE DE TRANSDUCTEURS PHOTO-ELECTRONIQUES ALIGNES SUR AU MOINS UNE RANGEE BTRPE, AU MOINS DEUX TRANSDUCTEURS ETANT ASSOCIES TRPE, TRPE(I1)J A UNE MEME TACHE. SELON L'INVENTION, LE PROCEDE EST CARACTERISE EN CE QUE, ON ACQUIERT A DES INSTANTS D'ECHANTILLONNAGE DETERMINES, L'IMAGE ELECTRIQUE DE LA PORTION DE PISTE OBSERVEE, SOUS FORME D'UNE PLURALITE D'IMPULSIONS ANALOGIQUES S'TRPE, S'TRPE(I1)J, QUI SONT DECALEES EN PARALLELES, PUIS TRANSFEREES DANS UN REGISTRE OU ELLES SONT DECALEES EN SERIE, JUSQU'A OBTENTION D'UN SIGNAL DE SORTIE ANALOGIQUE SSR TRANSFORME ENSUITE EN UN SIGNAL LOGIQUE DE FREQUENCE EGALE A LA FREQUENCE D'ECRITURE F DES INFORMATIONS SUR LE SUPPORT SM. APPLICABLE AUX MEMOIRES MAGNETO-OPTIQUES.

Optical reader/writer for optical, magnetic or magneto-optical data storage medium

L'invention concerne un dispositif d'inscriptionllecture optique d'un support d'informations. Ce dispositif comporte : - un substrat (2) transparent possédant une face sensiblement plane (20) portant au moins une paire d'électrodes (E1-E2) délimitant une aire d'entrefer (3) dont la dimension correspond sensiblement à la dimension de l'information à inscrire ou à lire. Une paire d'électrodes (E1-E2 ou E3-E4) constitue un résonateur pour une onde électromagnétique incidente ayant une composante de son champ électrique parallèle à la direction d'alignement des électrodes; - une source optique (1) éclaire lesdites électrodes à l'aide d'un faisceau optique (F1) dont une composante du champ électrique est parallèle à la direction d'alignement de la paire d'électrodes. Dans ces conditions, sous excitation du faisceau FI, lesélectrodes réémettront un faisceau qui présente une concentration de champ au niveau de l'entrefer (3). Ce faisceau réémis permet d'inscrire/ lire un support d'informations ...

OPTICAL READER TAPE RECORDER OPTIMIZES BY THE POLARIZER OF INCIDENTAL LIGHT

Un dispositif de lecture magnéto-optique dans lequel le facteur de mérite est optimisé principalement par le réglage du polariseur de lumière incidente. La composante S de l'onde incidente pompe le transducteur magnéto-optique. La composante P de l'onde incidente amplifie les variations de l'onde magnéto-optique et génère une onde réfléchie de polarisation sensiblement linéaire.

MAGNETO-OPTIC RECORDING/REPRODUCING APPARATUS

PURPOSE: A magneto-optic recording/reproducing apparatus is provided to reduce the number of components by reproducing the data signal with the first hologram device and the survo signal with the second hologram device. CONSTITUTION: The magneto-optic recording/reproducing apparatus includes a light source(31) and an objective lens(33) for condensing the light beam from the light source(31) and forming a light spot. The objective lens(33) is driven by an actuator(34). The actuator(34) is driven by servo signal. A polarized beam splitter(32) for discriminating a path of the light beam is positioned between the light source(31) and the objective lens(33). Preferably, a collimator(36) is provided to the light path between the light source(31) and the polarized beam splitter(32). A light detector(41) is positioned to the front of the polarized beam splitter(32) and detects a data signal recorded to a magneto-optic disk(35) and a servo signal(tracking, focusing signals). A hologram light splitter ...

STORAGE APPARATUS

A storage apparatus capable of recording or reproducing onto/from an optical information recording medium on which ROM information is recorded by a phase pit and RAM information is recorded while being superimposed on the recording area of the phase pit. The apparatus detects a reflected light of a laser beam from the optical information recording medium and has a main controller operating as follows. When the output of the recording information detection system for generating a signal corresponding to the ROM information and the RAM information simultaneously has an ROM signal and an RAM signal corresponding to the ROM information and the RAM information, the main controller performs negative feedback control of light emission of the semiconductor laser by using the ROM signal in the output of the recording information detection system in such a manner that the read/reproduced ROM signal is obtained from output of the light intensity detection system detecting the intensity of the laser ...

POLARIZATION SENSITIVE PHOTODETECTORS AND DETECTOR ARRAYS

A device for detecting polarization of light comprising a first photodetector tuned to absorb TE polarization, a second photodetector tuned to absorb TM polarization, and a circuit for comparing an output from the first and second photodetector for generating a polarization output. The first photodetector comprises a first reflector, an absorption layer on top of the first reflector, and a second reflector on top of the absorption layer. The second photodetector comprises a third reflector on top of an absorption layer, and a fourth reflector disposed under absorption layer.

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 DISK DEVICE

Light beams emitted from a light source (11) and returned light beams reflected off magneto-optical disks (7a), (7b), (7c), (7d) are transmitted by using polarization preserving optical fibers (15a), (15b), (15c), (15d). Phase difference generating means (16a), (16b), (16c), (16d) are disposed in the optical paths of the light beams, and the phase differences of electric field vibration components occurring in the light beams due to double refraction of polarization preserving optical fibers (15a), (15b), (15c). (15d) are offset by phase differences produced by phase difference producing means (16a), (16b), (16b), (16c), (16d), or the phase differences are adjusted to be multiples of π.

Optical disk unit for recording or reproducing information

The present invention relates to an optical head device and an optical disk unit using the same. The optical head device includes a relay lens control unit to control at least one of lenses of a relay lens unit based on an output signal outputted from a first optical detector and a power control circuit to control an intensity of a light beam emits from a light source.

Optical head, light-emitting/receiving device, and apparatus for recording/reproducing optical recording/recorded medium

An optical head in which focussing error is detected by a spot size method used for recording and/or reproducing information signals on or from an optical disc. The optical head includes a unit for correcting the spot shape between the objective lens and a photodetector device. The spot shape correcting unit corrects part or all of light spots formed on the photodetector by a light beam reflected back by the optical disc so that the spot diameter in a direction traversing a track on the optical disc will be larger than the spot diameter along the track.

Cartridge-loading apparatus with improved cartridge receiver

The mechanism for loading and unloading a disk cartridge uses two sliders (one on each side of a base plate), which move in opposite directions under the influence of a tiller. Each slider has a slot to receive one of the two lifting pins provided on the cartridge receiver. The movement of the sliders drives the lifting pins along the slots, thereby raising or lowering the cartridge receiver depending upon the direction of rotation of the tiller. The sliding motion of the lifting pins engaged in the S-shaped slots thus unloads a disk from or, alternatively, loads the disk onto the drive spindle. As the lifting pins travel along their respective slots, the lifting and lowering of the disk is accomplished in such a manner that the disk hub is peeled from the spindle magnet rather than being lifted vertically off the spindle. This reduces the peak force required to break the magnetic clamp force between the spindle magnet and the disk hub. In this system, the dust door is attached to the cartridge ...

Optical element and optical pickup device comprising it

An optical element comprises a polarization diffraction element that is provided with diffraction gratings that are respectively mounted on different faces of a transparent substrate of a flat plate shape, which grating pitches are equal to each other and approximately equal to the wavelength of an incident light, and which grating lines are parallel. The thickness of the substrate is set such that the difference that occurs between the phases of the P and S polarizations of a light due to the grating, and the difference that occurs between the phases of the two polarizations when the light propagates through the substrate cancel out. The optical pickup device comprising the optical element includes a polarized light detecting unit provided with a diffraction grating which grating pitch is approximately equal to the wavelength of an incident light; a first photodetector that is mounted integrally and virtually in parallel with the substrate, and that receives a zero-order diffracted light ...

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 information recording/reproducing apparatus that produces verifying reproduction signals by executing a computation using detection signals of multi-divided detection surfaces of a photo-detector

An optical information recording and/or reproducing apparatus includes an irradiating device including an objective lens, having a curved surface, for irradiating a recording light beam to a magnetooptical recording medium having at least two magnetic layers, which are a recording layer and a reproduction layer, and which are exchanged-coupled to each other, and a magnetic layer for controlling the exchange-coupling force to block the exchange-coupling force between the recording and reproduction layers, a device for applying an external magnetic field modulated according to an information signal to be recorded on the beam irradiated portion of the recording medium to record information on the recording layer and to orient magnetization of the reproduction layer in a direction parallel to the external magnetic field, a splitting device including a polarizing beam splitter for splitting at least light produced by a magnetooptic effect of the recording medium and light produced by diffraction ...

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.

Light signal detection circuit

An output current from the anode side of one photo-diode PD1 of two photo-diodes PD1, PD2 and an output current from the cathode side of the other photo-diode PD2 which serves as an in-phase signal with respect to the first mentioned output current are added in terms of current to convert an added current thus obtained into a voltage signal by a current/voltage converter 1. Thus, circuit such as summing amplifier, etc. can be omitted and this light signal detection circuit is only required to have one circuit/voltage converter 1. As a result, noise at the time of reproduction of a magneto-optical signal can be reduced while holding the circuit scale down to small size. Thus, S/N ratio of the reproduction signal is improved, thus, making it possible to improve, e.g., the error rate in the digital system to much degree. Accordingly, improvements, in reliability /information desity/transmission rate(speed) can be made.

Integrated confocal optical pick-up head with a hologram and a polarizer mounted on each side of a transparent heat sink

Light is emitted from a light-emitting element toward an irradiated medium, and returning light reflected by the irradiated medium is diffracted by a hologram device. A polarizer polarizes the light diffracted by the hologram device to produce first polarized light that has passed through the polarizer and second polarized light that has been reflected by the polarizer. The first polarized light is detected by a first light-detecting element, and the second polarized light is detected by a second light-detecting element. A magnetooptical signal is generated as the difference between the intensities of the first and second polarized lights which are detected respectively by the first and second light-detecting elements.

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.

Compact size magneto-optical head with a hologram and a beam splitting means

An optical head for a magneto-optical disk drive, including a laser diode mounted on a stem, a first photodetector unit for detecting a magneto-optical signal, and a second photodetector unit for detecting a focusing error signal and a tracking error signal. The optical head further includes a cap mounted on the stem so as to surround the laser diode and the first and second photodetector units, a beam splitter unit mounted on the cap, and a hologram mounted on the cap. The beam splitter unit includes a polarization beam splitter, an optical rotating film for rotating a polarization plane of a part of a beam reflected on a magneto-optical disk by 45 degrees, and a Rochon prism. The hologram diffracts a part of the reflected beam from the magneto-optical disk toward the second photodetector unit.

Objective lens system and optical disk apparatus using the same

An objective lens system includes a first lens and a second lens. The first lens has a first surface for allowing entry of light and a second surface opposite to the first surface. The second lens has a spherical third surface and a flat fourth surface opposite to the third surface. The third surface faces the second surface and has a radius of curvature r0. The second lens has a thickness d0 and a refractive index n0. The thickness n0, the radius of curvature r0 and the refractive index n0 satisfy a relation: d0>r0>n0d0.

Optical head having light blocking means positioned in front of a detector for super-resolution detection

An optical head includes a lens system forming light reflected from an optical disk into parallel rays, a focal error and tracking error detection system detecting focal error and tracking error based on the parallel rays, an optical reproduced signal detection system detecting a reproduced signal reproduced from the optical disk based on the parallel rays, and a light blocking part for blocking, out of the parallel rays, at least a central portion in a light amplitude distribution of parallel rays supplied to the optical reproduced signal detection system.

Method and apparatus for reproducing optically an information recorded on a record medium along tracks

In a method and apparatus for detecting an information signal and a focussing error signal of an objective lens with respect to a video disc on which main and sub beams emitted from a laser light source are to be focussed as light spots by the objective lens, the main and sub beams reflected by the video disc are made incident as parallel light fluxes upon a detection prism surface which is set substantially at a critical angle with respect to the main beam, but at an angle smaller or larger than the critical angle with respect to the sub beam, and two light fluxes of the reflected main beam which situate on respective sides of a boundary plane including the central light ray and perpendicular to a plane of incidence, and are reflected by the reflection surface are separately received by two light receiving regions which are divided along a boundary plane including the main beam reflected by the reflection surface and perpendicular to the plane of incidence. The focussing error signal is derived as a difference between output signals from the two light receiving regions and the information signal is derived as a sum of the output signals from the two light receiving regions. The sub beam transmitted through and refracted by the reflection surface is received by a light detector and a tracking error signal is derived by detecting a variation in a light amount of the sub beam impinging upon the light detector.

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.

Magneto-optical recording and reproducing device having light interrupting forming main robe and side robe light beam portions

A magneto-optical recording and reproducing device is provided with a magneto-optical disk for reproducing recorded information using light, a semiconductor laser, an objective lens for converging a light beam emitted from the semiconductor laser onto the magneto-optical disk and a light interrupting member for interrupting a portion of a light beam before it is incident on the objective lens. The magneto-optical disk is composed of a readout layer which is predominant in in-plane magnetization, and in which a transition occurs to be predominant in perpendicular magnetization as temperature thereof is raised and a recording layer for recording thereon information using a perpendicular magnetization. In this arrangement, since the light interrupting member is provided, a light spot can be made smaller, thereby improving a recording density. Moreover, even when temperature of the readout layer is raised due to a side robe generated by the light interrupting member, in-plane magnetization ...

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.

Magneto-optical recording and reproducing apparatus and method

A magneto-optic recording medium reproduction device includes a multi-clad, step index optical fiber, a semiconductor laser arranged on one end surface side of the optical fiber for providing laser beam to one end surface of the optical fiber, a photodetector arranged on one end surface side of the optical fiber and receiving laser beam from one end surface of the optical fiber, and a magnetic head for applying an alternating field to the magneto-optic recording medium. Since the other end surface of the optical fiber is arranged adjacent to the magneto-optic recording medium, an accurate signal can be reproduced even from an extremely small recorded domain. Furthermore, since an alternating field is applied to the magneto-optic recording medium, a domain transferred from a recording layer of the magneto-optic recording medium to a reproducing layer is expanded and a large reproduced signal can be obtained from the expanded domain.

Optical head for scanning a record carrier

A device for scanning a first and second type of optical record carriers (2; 40) generates a first and a second radiation beam for scanning the first and second type of record carriers, respectively. The information layers (4; 42) of the first and second type of record carriers is scanned through transparent layers (3; 41) of different thickness. The first radiation beam (17) has a first wavelength and a first numerical aperture NA1. The second radiation beam (46) has a different, second wavelength and an effective second numerical aperture NA2 smaller NA1. The rays of the second radiation beam having an NA smaller than NA2 form a central sub-beam (48), the rays having a larger NA form an outer sub-beam (49). The device includes a non-periodic phase structure that does not affect the first radiation beam. The phase structure introduces an amount of spherical aberration in the central sub-beam (48). The phase structure is transparent for the central and outer sub-beam (48; 49). The introduced ...

Improved cartridge loading apparatus with tilting bias coil assembly

Optical disc system

Optical pick-up device

OPTICAL INFORMATION REPRODUCING DEVICE

PURPOSE: To effectively prevent deterioration in C/N of information signals and to effectively decrease the off-sets of push-pull signals even if optical axis misalignment arises. CONSTITUTION: This optical information reproducing device has a first beam splitter 53 which separates a forward path and a backward path and a nearly parallel flat planar second beam splitter 57 which separates the separated return light to two luminous fluxes including at least a luminous flux having an astigmatism. This first beam splitter 53 is composed to nearly 100% of transmittance or reflectivity to the polarized light component of a direction perpendicular to the linearly polarized light direction of the incident light from a semiconductor laser 51. A photodetector 58 for photodetecting the luminous flux having the astigmatism separated by the second beam splitter 57 is so arranged that the major axis direction of the elliptic spot formed on this photodetector 58 is in a push-pull signal direction. COPYRIGHT ...

MAGNETO-OPTICAL HEAD DEVICE

PROBLEM TO BE SOLVED: To provide a magneto-optical head device and a magneto-optical reproducing method for performing magnetic ultra-resolutional reproduction while obtaining a high regenerative signal S/N. SOLUTION: A magneto-optical disk 1 is irradiated by a parallel beam of (p) polarization to reflect it. The reflected beam is reflected by a first beam splitter 14 to be supplied to a regenerative signal detection system 20. The reflected beam is supplied to a light shield plate 21, and a (p) polarization component transmits through an area of a polarizing film 21b at a transmissivity of nearly 100%, and an (s) polarization component transmits at a transmissivity of nearly 0%, that is reflected or absorbed to be light shielded. The beam transmitting through the light shield plate 21 is made incident on a polarizing beam splitter 19 to be divided to the (p) polarization component and the (s) polarization component, and the regenerative signal is differential-detected. Since outputs of ...

OPTICAL INFORMATION STORAGE

PROBLEM TO BE SOLVED: To reduce cross talk from adjacent tracks by separating reflected light from a record medium to three or above of luminous flux and making the phase compensation amount of the luminous flux when its polarization state is detected so that an absolute value of a difference between the phase compensation amounts required for reproducing signals from a land and a groove becomes within the specified range. SOLUTION: The luminous flux emitted from a semiconductor laser 1, made incident on a polarizing beam splitter 3 to be transmitted is converged to a diffraction limit by an objective lens 4 to be emitted to the land and groove on a recording surface of a magneto-optical disk 5. Reflected luminous flux is led to the polarizing beam splitter 3, and the reflected luminous flux is separated to 0-order light and ±1st-order light by a diffraction grating 6. Respective separated luminous flux are separated to P/S polarization components by a wavelength plate 7 and a Wollaston ...

Linsenanordnung und deren Verwendung in einem optischen Abtastkopf

Optisches Speichergerät

Optisches Informationsaufzeichnungs-/wiedergabegerät

Optische Informationsspeichervorrichtung, die optimale Phasenkompensationen gemäss Aufzeichnungsspuren beim Reproduzieren von Information liefern kann

Magneto-optisches Plattenlaufwerk zum Richten eines einfallenden Lichtstrahls auf ein magneto-optisches Aufzeichnungsmedium mit einer Aufzeichnungsoberfläche, die aus Erhebungen und Rillen als Spuren besteht, und Detektieren eines reproduzierten Signals von einem reflektierten Lichtstrahl von dem magneto-optischen Aufzeichnungsmedium, gekennzeichnet durch eine Phasenplatte (86), die in einem optischen weg des reflektierten Lichtstrahls vorgesehen ist, um zwischen einer ersten Position, in der die Phasenplatte (86) dem reflektierten Lichtstrahl einen ersten Phasenkompensationsbetrag verleiht, der für eine Detektion von Signalen von den Erhebungen erforderlich ist, und einer zweiten Position neigbar zu sein, in der die Phasenplatte (86) dem reflektierten Lichtstrahl einen zweiten Phasenkompensationsbetrag verleiht, der für eine Detektion von Signalen von den Rillen erforderlich ist; und einen Treiber (98, 110, 130, 140) zum Neigen der Phasenplatte (86), und ein Steuermittel (99) zum Liefern ...

Polarisationsmesssystem

Erhöhung der Speicherdichte von Informationsspeichermedien

Read/write system for flexible optical/magneto-optical media

A read/write storage system for reading/writing data to and from a flexible optical or magneto-optical media (disc or tape eg helically scanned by rotating drum) includes an optical read/write head and a fine movement stabilizer 64 positioned proximate the flexible media for stabilizing the flexible media in a desired position so that the optical head providing focussed light need not be moved substantially toward or away from the media in order to maintain the light focussed on the media. A record disc may be additionally stabilised by Bernouilli plate 66 as part of cartridge (12) (eg Fig 1) or attached to drive 10. Magnetic head (170) below the media and plate (166) may provide stabilisation (Fig 11); coupler (164) surrounding lens (156) may also be shaped for stabilisation. Geometrics of stabilizer (64) and magnetic head (170) are detailed W.r.t. (Figs 5 and 12). The magneto-optical assembly of (Fig 13) includes U-shaped magnetic element (180) and the optical head on the same side of ...

Optical system using polarized light.

PURPOSE:To utilize projection polarization without any influence upon the double refraction of the optical system by providing a light source part which emits polarized luminous flux and the optical system which uses the luminous flux from the light source and matching the projection polarization of the light source part with the characteristic polarization of the optical system. CONSTITUTION:When an objective lens 21 has double refraction because of a plastic lens to have the possibility that a polarization state is changed, the characteristic polarization vector of the objective 21 is measured previously, and rotated and adjusted around the optical axis so as to match the polarization vector of luminous flux which is made incident from the light source part 10. Consequently, the luminous flux emitted by the light source 10 can be used without any change in the polarization state although an optical element which provides double refraction such as the plastic lens is used.

Improved optical reflector for micro-machined mirrors

A micromachined reflector comprising a planar substrate (146) and a reflective layer (147) secured to the planar substrate. The reflective layer has a stress. An additional layer (148) of material is secured to the reflective layer. The additional layer has a stress substantially opposing the stress of the reflective layer. The stress of the additional layer substantially offsets the stress of the reflective layer to enhance the planarity of the micromachined reflector.

EINRICHTUNG ZUM BELEUCHTEN EINES OBJEKTES MIT FOKUSSIERTEM LICHT

EQUIPMENT FOR DATA SEIZURE AND - RENDITION ON OR OF AN OPTICAL PLATE.

INTEGRATED MICRO-OPTICAL SYSTEMS

Polarization sensitive photodetectors and detector arrays

OPTICAL RECORDING MEDIUM, AND OPTICAL STORAGE DEVICE

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 ELEMENT AND OPTICAL PICKUP DEVICE COMPRISING IT

POLARIZATION DIFFRACTION ELEMENT AND POLARIZATION DETECTOR EMPLOYING THE SAME

A polarization diffraction element comprising two diffraction gratings formed on both faces of a substrate respectively. Both the diffraction gratings have grating lines which are arranged at the same grating pitch, and whose directions mutually form a predetermined minute angle. The grating lines may also be arranged parallel to each other. In this case, the relationship between grating pitches D1, D2 of the respective diffraction gratings and the wavelength .lambda. of an incident light is expressed as: 0 < ¦ .lambda.(1/D1 - 1/D2)(1 - (.lambda./2D1)2) - (1/2) ¦ ~ 0.35; or 0 < ¦ .lambda.(1/D1 - 1/D2)(1 - (.lambda./D1 - .lambda./2D2)2) - (1/2) ¦ ~ 0.35 In a polarization detector employing this polarization diffraction element, a single converging lens of a small effective diameter separates one polarization from another polarization and converges them separately on different photodetectors. Consequently, a still more compact and lightweight optical pickup can be manufactured.

POLARIZATION SENSITIVE PHOTODETECTORS AND DETECTOR ARRAYS

A device for detecting polarization of light comprising a first photodetector tuned to absorb TE polarization, a second photodetector tuned to absorb TM polarization, and a circuit for comparing an output from the first and second photodetector for generating a polarization output. The first photodetector comprises a first reflector, an absorption layer on top of the first reflector, and a second reflector on top of the absorption layer. The second photodetector comprises a third reflector on top of an absorption layer, and a fourth reflector disposed under absorption layer.

Photo pick-up device with polarization selection element and photo apparatus with said device

READING DEVICE OF ELONGATE SEGMENTS OF A SUPPORT UNWINDING.

MEMORY SYSTEM READ/WRITE APPARATUS AND APPARATUS FOR READING AND/OR WRITING OF A FLEXIBLE SUPPORT DATA OPTICALLY DETECTABLE

Support of tape recording allowing the fast optical character reading of the recorded data

OPTO-ELECTRONIC PROCESS OF READING Of CONTAINED INFORMATIONS ON MAGNETIC MEDIUM AND CIRCUIT TO IMPLEMENT IT

Optical pickup device and optical disk recording and/or reproducing device

REWRITABLE OPTICAL RECORDING SYSTEMS

A method of reading out data from a domain expansion data storage such as a MAMMOS magneto-optic disk (1) which includes a data storage layer (22) in which data is stored in the form of magnetic marks, and an expansion layer (24) capable of copying and expanding domains from the storage layer, the system applying a first radiation beam (7), having a first spot size on the disk, in order to initiate copying of a domain from the storage layer to the expansion layer, and applying a second radiation beam (9), having a second spot size larger than the first spot size on the disk, in order to read out data from the expansion layer. © KIPO & WIPO 2007 ...

LIGHT RECEIVING UNIT, OPTICAL PICKUP EQUIPPED WITH THE LIGHT RECEIVING UNIT AND OPTICAL REPRODUCING AND RECORDING DEVICE

PURPOSE: An optical pickup is provided to enable recording or reproduction to several optical recording media whose track shape and track pitch are different. CONSTITUTION: The optical pickup has a hologram optical element which divides a laser beam into three beams of a main beam, a preceding sub-beam, and a succeeding sub-beam, for irradiating an optical recording medium(4), and divides into four more beams each of a return light beam reflected by the optical recording medium concerned. Each divided beam is received by a light receiving unit having a first to fourth main light receiving elements, a first to fourth preceding sub-light receiving elements and a first to fourth succeeding sub-light receiving elements. A tracking servo to the optical recording medium(4) concerned is performed exactly by selecting a tracking error signal most suitable for the kind of an optical disk to be reproduced among three kinds of tracking error signals detected by the combination of the detecting signal ...

Cartridge-loading apparatus and method

MAGNETOOPTIC RECORDING MEDIUM AND MAGNETOOPTIC RECORDING HEAD

A magnetooptic recording medium includes a substrate and a magnetooptic recording film. The substrate is made of a material having a light transmission property, and the magnetooptic recording film is disposed on one side of this substrate. A groove having an optical depth in a range between 'lambda'/8 and 'lambda'/4, where 'lambda' is the wavelength of an incident optical beam, is formed in the surface on which the magnetooptic recording film is disposed. Themagnetooptic recording film is formed in such a manner that a Kerr ellipticity becomes 0°. A magnetooptic recording head includes an optical axis device for correcting the Kerr ellipticity of the recording medium, disposed in an optical path between an objective lens for condensing the optical beams from a light source on the recording film and a polarizing beam splitter.

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 system for optical information recording/reproducing apparatus

In an optical system comprising a light source section consisting of a semiconductor laser and a collimator lens, an objective lens for focusing a light beam on an optical disk, a beam splitter for separating part of the light beam reflected from the optical disk, a condenser lens, and a photosensor for detecting the separated light beam to produce a focusing and a tracking error signal, a plane parallel plate is provided between the light source section and the beam splitter. By rotating the plane parallel plate with an adjusting mechanism, the light beam undergoes a parallel shift, so that the intensity distribution of light being incident on the objective lens is varied and a tracking offset due to a deviation of the optical axis of the output light from the light source section can be compensated for. The plane parallel plate may be disposed between the beam splitter and the condenser lens.

Polarizing beam splitter and magneto-optic reading device using the same

A polarizing beam splitter for splitting a non-collimated light beam of a given wave length into two sub-beams, each of a different state of polarization, has a substrate provided with a polarizing stack of thin layers and a compensating means for compensating retardation of the light beam occurred in passing through the polarizing stack.

OPTICAL STORAGE MEDIUM, OPTICAL STORAGE MEDIUM MANUFACTURING METHOD, AND OPTICAL STORAGE

Recording density is improved by performing anneal processing on an optical storage medium (4). Anneal management information (40) is recorded in the optical storage medium (4) without performing anneal processing, and is provided to a user. Anneal processing is performed and high density recording and reproducing is enabled by the effect of annealing on an area between recording tracks based on the choice of the user. Since initialization processing (anneal processing) by a storage medium manufacturer can be omitted, the medium can be provided at low price. Also a deep groove medium need not be used because of the effect of annealing, thereby the manufacturing of a substrate used for a medium is easy. It is preferable that advertisement information is recorded in a pit section (4-1) as content information, so that the content can be reproduced automatically during anneal processing, and the medium price can be reduced due to advertisement fees.

Recording medium

Polarizer, optical element, and optical head

An optical element, for example for use in an optical head, comprises a member in the form of a single piece through which converging or diverging forward and returning light beams pass. The optical element is configured such that the optical length of a forward light beam is different from that of a returning light beam. A step may be provided on the surface of the optical element, which may comprise two discrete parts bonded to each other to form a single piece.

Optical information recording/reproducing apparatus

An optical information recording/reproducing apparatus records information on and/or reproduces information from an optical recording medium and detects a focal error based on a reflected light beam from the optical recording medium. The apparatus includes an optical element (15, 15A, 25, 25A, 85, 85A, 95, 95A, 105, 105A, 105B, 35, 45, 55) which deflects a part of the reflected light beam to at least two positions excluding a central part of the reflected light beam, and a photodetector device (16, 26, 36, 56, 66, 216A) having a plurality of photodetectors which respectively detect the deflected parts of the reflected light beam and output detection outputs. The focal error is detected based on the detection outputs of the photodetector device. ...

OPTICAL PICKUP DEVICE

PURPOSE: To read out information with a high resolution by partially overlapping two beam spots different in polarization state to irradiate a recording medium with them and making the read range smaller than the size of one beam spot. CONSTITUTION: A light dividing element 5 which divides a light beam to two light beams which are set to linear polarization states to have polarization directions orthogonal to each other and are different in an advance direction and a phase converting element 6 which converts phases of oscillation components in two axes orthogonal to each other in a plane orthogonal to the advance direction of the incident beam are provided. Two beam spots different in polarization state are partially overlapped and are irradiated to a recording medium 2. Consequently, the recording medium 2 is irradiated with light beams in three kinds of polarization state, and the area irradiated with the light beam related to read of an information signal out of these light beams is ...

HIGH DENSITY MAGNETO-OPTICAL DISK DEVICE

PROBLEM TO BE SOLVED: To provide a high density magneto-optical disk device for removing interference (crosstalk) between the signals of adjacent tracks adjacent to the track to be reproduced at the time of reproducing the signals recorded on a magneto-optical disk. SOLUTION: This device is provided with a phase modulation optical element for changing the polarization state of a light spot impressed on the recording surface of a disk corresponding to a signal detection position. Thus, by forming the light spot provided with linear polarization in a reproducing track and a circular polarization state in the adjacent track on the recording surface of the magneto-optical disk by using the phase modulation optical element, even when a track interval is excessively narrowed compared to the light spot, the density of the magneto-optical disk is raised by removing an inter-track signal interference effect caused by it. COPYRIGHT: (C)1997,JPO ...

RECORDING MEDIUM RECORDING AND REPRODUCING DEVICE AND METHOD THEREFOR

PROBLEM TO BE SOLVED: To suppress the occurrence of spherical aberration in an optical disk device. by moving a first lens and a second lens in an optical axis direction of a light beam and relatively moving one side of the first lens and the second lens with respect to the lens of other side in the optical axis direction of the light beam. SOLUTION: Since an actuator 6 is made so as to relatively move a front cell lens 3 in the optical axis direction with respect to an objective lens 4, it is possible to adjust the interval between the front cell lens 3 and the objective lens 4. Moreover, since an actuator 7 is a biaxial actuator, the actuator 7 is made so as to move the front cell lens 3 and the objective lens 7 in the optical axis direction and also to move them in a direction perpendicular to tracks of an optical disk 1. By such a constitution, the distance of an air gap 8 can be adjusted by the actuator 7 and also the interval between the front cell lens 3 and the objective lens 4 ...

OPTICAL SYSTEM FOR OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE

PURPOSE: To facilitate the adjustment of the dispersion of the emitting optical axis of a light source or a light receiving element, wedge prism or the like by providing a freely turnable parallel plane plate in an optical path from a light source up to a converging lens. CONSTITUTION: In the optical path up to the light source part composed of a semiconductor laser 1 and a collimator lens 2 and a converging lens 10, a freely turnable parallel plane plate 12 is provided. When the emitting optical axis of the light source part is dislocated with an ideal optical axis and the offset is included in a tracking error component, the parallel plane plate 12 is suitably turned and rotated, and thus, a push-pull offset detected by the light receiving element 20 can be removed with the intensity distribution of the incident luminous flux for an objective lens 5 as a symmetrical shape. Consequently, the offset of the intensity distribution due to the dispersion of the emitting optical axis of the ...

DEVICE AND METHOD FOR RECORDING MAGNETO-OPTICAL DISK

PROBLEM TO BE SOLVED: To provide a magneto-optical disk recording technique capable of confirming the recording nearly simultaneously with the recording by one beam. SOLUTION: This device is constituted of a pre-output detection circuit 1, a post-output detection circuit 2, a pre-output pulse forming circuit 3, a post- output pulse forming circuit 4, a logical operation circuit 5, a recording data memory circuit 6 and a comparison operation circuit 7. Further, photodetectors are arranged in array on a using optical head so as to detect return light from a laser light irradiation area of a medium which is irradiated with the laser light, dividing it into at least two positions or more in the advance direction of the laser light. COPYRIGHT: (C)1997,JPO ...

СПОСОБ ИЗГОТОВЛЕНИЯ УСТРОЙСТВ ДЛЯ ХРАНЕНИЯ ИНФОРМАЦИИ (ВАРИАНТЫ)

Изобретение относится к технике изготовления носителей информации. Для реализации предложенного способа используют средства введения подшипников и линзы, оснастки для приклеивания обмотки грубого привода и пружины, средство для приклеивания полюсных наконечников, оснастку для введения и проверки пентапризмы, средства определения констант и передаточных характеристик, устройство юстировки оптического модуля, средства для введения призмы, микропризмы и расщепителя пучка, средство юстировки канала считывания, устройство для прикрепления уравновешивающей массы, оснастку для юстировки позиционно-чувствительного датчика, устройство для прикрепления обмотки фокусировки и радиальных обмоток, средства контроля качества для проверки оптического запоминающего устройства до ввода в него линзы объектива и средства для проверки следящей системы. Изобретение обеспечивает улучшенное качество и высокую эффективность изготовления носителя информации. 3 с. и 14 з.п. ф-лы, 134 ил. Эт с ПЧ сэ (19) РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ ВИ” 2 188 464 ' (51) МПК? 13) С2 С 11 В 7/00 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 96115203/28, 24.07.1996 (24) Дата начала действия патента: 24.07.1996 (30) Приоритет: 06.02.1996 Ш$ 08/596,000 (43) Дата публикации заявки: 21.10.1998 (46) Дата публикации: 27.08.2002 (56) Ссылки: Ц$ 5347500 А, 13.09.1994. ЦЗ 5319624 А, 07.06.1994. Ц$ 5191570 А, 02.03.1993. $4 1778182 АЛ, 30.11.1992. (98) Адрес для переписки: 129010, Москва, ул. Б.Спасская 25, стр.3, ООО "Юридическая фирма Городисский и Партнеры", Кирюшиной Л.Н. (71) Заявитель: . ДИСКОВИЖН АССОШИЕИТС (13) (72) Изобретатель: ХОЛЛЕН Зденек А. (13), МЕРФИ Кент Т. (4$), МЕЙЕР Рассел А. (0$), РАССЕЛ Роберт Г. (4$), МОНСЕН Кристофер Дж. (4$), ДеПУЙ Чарльз (0$), ХИТОН Херберт Е. (4$), ХУВЕР Дуглас Е. (4$), КНОРР Кристофер А. (4$), АНДЕРСОН Гэри (4$), ПАПЕРНИК Дэвид Л. (4$), О'НИЛ ХОЛЛ Холлис 1 (4$), ЛОЙЕ Джеймс К. (0$) , ТЕЙЛОР Вилхелм (13), ГРАССЕНС Леонардус Дж. ( ...

Magneto-optisches Aufzeichnungsmedium auf dem es moglich ist, Informationen hoher Zeichendichte aufzuzeichnen und Verfahren zur Wiedergabe der aufgezeichneten Informationen

INTEGRIERTE MIKROOPTISCHE SYSTEME

Optisches Plattensystem

Optischer Kopf für optisches Plattenlaufwerk

Ein optischer Kopf für ein magneto-optisches Plattenlaufwerk, mit einer Laserdiode, die auf einen Stamm montiert ist, einer Detektoreinheit eines magneto-optischen Signals und einer Fehlersignaldetektoreinheit zum Detektieren eines Fokussierfehlers und eines Spurverfolgungsfehlers. Eine Kappe ist auf den Stamm montiert, um die Laserdiode und diese Detektoreinheiten zu umgeben, und eine Strahlenteilereinheit mit einhem Polarisationsstrahlenteiler und einem Polarisationsprisma ist auf die Kappe montiert. Ein Hologramm zum Beugen eines Fehlersignalstrahls hin zu der Fehlersignaldetektoreinheit ist auf einer unteren Oberfläche der Strahlenteilereinheit gebildet.

Optische Wiedergabekopfvorrichtung für verschiedene Plattentypen

FRONT LOADING OPTO-MAGNETIC RECORDING APPARATUS WITH BIAS MAGNETIC FIELD GENERATING MEANS RETRACTABLE FROM MEDIUM INSERTION PATH

RECORDING HEAD WITH WAVEGUIDE

An apparatus having a first pole with a first side and a second side opposite from the first side, a second pole positioned on the first side of the first pole, and a waveguide positioned on the second side of the first pole wherein the waveguide has an end adjacent to an air bearing surface. The first pole includes a first portion spaced from the waveguide and a second portion extending from the first portion to the air bearing surface, with the second portion being structured such that an end of the second portion is closer to the waveguide than the first portion. 1. An apparatus , comprising:a waveguide positioned on a first side of a first pole, the waveguide having an end adjacent to an air bearing surface,wherein the first pole includes a first portion spaced from the waveguide and a second portion extending from the first portion to the air bearing surface, with the second portion being structured such that an end of the second portion is closer to the waveguide than the first portion, and wherein the end of the second portion of the first pole is spaced from the air bearing surface.2. The apparatus of claim 1 , wherein the first pole is a write pole.3. The apparatus of claim 1 , further comprising a second pole positioned on the second side of the first pole claim 1 , the second side being opposite from the first side of the first pole.4. The apparatus of claim 3 , wherein the first pole is magnetically coupled to the second pole.5. The apparatus of claim 3 , wherein the second pole includes a first portion spaced from the first pole and a second portion extending from the first portion to the air bearing surface claim 3 , with the second portion being structured such that the second portion is closer to the first pole than the first portion.6. The apparatus of claim 3 , wherein the second pole is at least partially wrapped around the first pole.7. The apparatus of claim 3 , further including means for energizing the first pole and the second pole.8. The ...

Device and Method for Recording Information on a Magnetic Data Storage Medium

Disclosed is a device for recording information on a magnetic data storage medium which comprises a magnetic field source designed to be capable of generating a magnetic field in the region where the magnetic data storage medium is arranged; a source of electromagnetic radiation at a matrix of controllable mirrors; and a matrix of controllable mirrors mounted in a housing so as to be capable of reflecting electromagnetic radiation by means of the controllable mirrors into the region where the magnetic data storage medium is arranged and/or in another direction. The present invention makes it possible to record information on a fixed magnetic data storage medium. 1. A device for recording information on a magnetic data storage medium comprising:a magnetic field source configured to generate magnetic field in an area of the magnetic storage medium;a source of electromagnetic radiation configured to generate electromagnetic radiation and direct generated electromagnetic radiation to a matrix of controlled mirrors; andthe matrix of controlled mirrors installed in a housing with an ability to reflect electromagnetic radiation by controlled mirrors to the area of the magnetic storage medium and/or to the other side.2. The device according to claim 1 , wherein the electromagnetic radiation is optical one.3. A device according to claim 1 , wherein the source of electromagnetic radiation is a laser.4. The device according to claim 1 , wherein the matrix of controlled mirrors contains rotatable micromirrors.5. The device according to claim 1 , further comprising a control unit comprising:a magnetic field source control module, an electromagnetic radiation source control module, a control module for a matrix of controlled mirrors, a memory configured to store sequences of commands and/or recorded information, and a processor configured to receive data from the memory and control the magnetic field source control module, the electromagnetic radiation source control module, and ...

Waveguide core layer with reduced downtrack thickness proximate a near-field transducer

An apparatus includes a write pole proximate a media-facing surface of a recording head. A near-field transducer is adjacent to the write pole. A waveguide has a core layer extending from an energy source to the media-facing surface. The core layer includes a region of reduced downtrack thickness proximate the near-field transducer. The region of reduced downtrack thickness is defined by a notch facing away from the near-field transducer. A material of the notch has a different index of refraction than an index of refraction of the core layer.

Optical information recording and reproducing device

Bolometer for monitoring internal laser power in thermally assisted magnetic recording devices

Optical readout method

光学的情報記憶装置

(57)【要約】 【課題】 本発明は光学的情報記憶装置に関し、比較的 簡単、且つ、安価な構成で、安定したフォーカスエラー 信号及びトラッキングエラー信号を生成し、高品質な光 磁気信号を検出することを目的とする。 【解決手段】 光源と、光源から出射される光束を反射 して記録媒体の記録面に照射する偏光ビームスプリッタ と、記録面により反射された光束が偏光ビームスプリッ タを通過することにより発生するコマ収差を除去する第 １の手段と、偏光ビームスプリッタ及び第１の手段によ り発生される非点収差を除去する第２の手段と、非点収 差を発生される第３の手段とを備えるように構成する。

光デイスクの記録再生装置

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Optical device

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.

High numerical aperture optical focusing device for use in data storage systems

A near-field optical or MO data storage system uses an optical focusing device for focusing an incident optical beam to a small size focal spot. The optical focusing device includes an optically transmissive body which is defined by a generally flat incident surface, a flat, bottom surface disposed opposite and parallel to the incident surface, and a reflective side coated with a reflective layer for reflecting the optical beam through the body toward the bottom surface. The bottom surface defines a focal plane on which the focal spot is formed, for generating a localized evanescent field. The focal spot is located along a central axis P, in very close proximity to the data storage disk, such that the localized evanescent field interacts with the disk, for enabling data to be transduced to and from the disk by effecting near field coupling. An electro-magnetic coil or coil assembly, can optionally be formed on the bottom surface, co-axially with the focal spot, for generating a desired write magnetic field. The reflective side of the optical focusing device preferably has a parabola shaped curvature, but other shapes can alternatively be selected. For example, the side curvature can have a tilted parabola shape.

Super-resolution Parabolic Lens

본 발명은, 광의 파장, 입사빔의 직경이 일정할 때, 광의 수렴각을 크게하고, 스팟이 형성되는 매질의 굴절률을 증기시킬 수 있도록 하는 초고분해능 포물선형 렌즈를 제공하는데 그 목적이 있다. SUMMARY OF THE INVENTION An object of the present invention is to provide an ultra-high resolution parabolic lens for increasing the convergence angle of light when the wavelength of light and the diameter of the incident beam are constant, and allowing the refractive index of the medium on which the spot is formed to be vaporized. 본 발명에 의하면, 외부로부터 입사되는 광을 집광 시키기 위한 집광 렌즈에 있어서, 상기 렌즈의 한면은 평면이고, 다른 한 면은 포물선 형태의 곡선면을 형성하고 있으며, 상기 렌즈의 곡선면은 정점을 제외한 다른 부분이 반사 코팅되어 있으며, 상기 렌즈의 평면에 평행광이 입사될 경우에, 상기 렌즈의 내부에서 몇번의 반사를 거친 후에, 코팅이 없는 상기 렌즈의 정점을 통하여 외부의 물체에 전달되는 것을 특징으로 하는 초고분해능 포물선형 렌즈가 제공된다. According to the present invention, in a condensing lens for condensing light incident from the outside, one side of the lens is a plane, the other side forms a parabolic curved surface, the curved surface of the lens except the vertex The other part is reflective-coated, and when parallel light enters the plane of the lens, after several reflections inside the lens, it is transmitted to an external object through the vertex of the uncoated lens. An ultra high resolution parabolic lens is provided.

Polarization separating element, manufacturing method and optical pick-up apparatus

本发明提供一种不用特别装置即可容易且廉价地制造的部分偏振性的偏振光分离元件及其制造方法。制造偏振光分离元件(1)时,在作为光学各向同性衬底的玻璃衬底(10)的表面(101)上,形成聚二乙炔衍生物膜(11),通过有选择地紫外线照射该聚二乙炔衍生物膜(11),形成2种色彩的周期构造,同时形成凹凸,制成具有部分偏振性的周期光栅(12)。该具有部分偏振性的偏振光分离元件(1)若用于光拾取装置,则即使光盘有双折射,由于部分返回光必定到达光接收元件,可无故障地进行信息重放。

Signal detection system of magneto-optical disk drive

A magneto-optical recording medium and recording/reproducing method for the same

본 발명은 투광성 기체, 기체상에 형성되며, 실온에서 면내 자기 이방성이 우위인 면내 자화를 나타내는 한편, 온도 상승에 따라 수직 자기 이방성이 우위인 수직 자화로 이행하는 독출층 및 독출층 위에 형성되며, 정보를 광 자기 기록하는 기록층을 가지고 있는 광 자기 기록 매체, 이 광 자기 기록 매체에 대한 기록 재생 방법 및 이 광 자기 기록 매체에 적합한 광 헤드에 관한 것이다. 이들 구성에 의하면, 고밀도로 정보를 기록할 수 있고, 그 정보를 재생할 수 있다. The present invention is formed on a light-transmitting gas and a gas phase, and is formed on a read layer and a read layer which exhibit in-plane magnetization with superior in-plane magnetic anisotropy at room temperature, and shift to vertical magnetization with superior vertical magnetic anisotropy with increasing temperature, A magneto-optical recording medium having a recording layer for magneto-optical recording information, a recording / reproducing method for the magneto-optical recording medium, and an optical head suitable for the magneto-optical recording medium. According to these configurations, information can be recorded at a high density, and the information can be reproduced.

Optical pick-up apparatus of optical magnetic optical reproductor system

a collimator lens 21 for converting the laser beam into the circular beam from the laser light source which generates from the laser beam examined on the surface of the optical magnetic disk; a regular prism 22 for partly reflecting the early circular laser beam converted by the collimator lens; a polarized light separator 23 for separating polarized elements of the polarized beam reflected from the surface of the optical magnetic disk; an object lens 24 for condensing the laser beam from the regular prism into the surface of the optical magnetic disk; and a prism mirror 25 for reflecting one polarized element among the polarized elements separated by the polarized light separator.

Magneto-optical head device and recording / reproducing device

Optical recording and reproducing device

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Optical pickup using vertical cavity surface-emitting laser diode

一种用一个垂直空腔表面发射激光二极管代替边缘发射激光二极管的光学拾波器。在由垂直空腔表面发射激光(VCSEL)二极管构成的光源和光检测器集成在单一基片上时，通过去除用作光检测器的垂直空腔表面发射激光二极管的上反射镜层的部分或全部，可以获得一个具有小像散性和优良特性的激光束，并且采用相同的方法，通过以高的灵敏度探测由光盘反射的光，可以明显地减少光的损失。

LIGHT SIGNAL DETECTION CIRCUIT

2개의 포토다이오드(PD1, PD2)중의 한편의 다이오드(PD1)의 애노드축으로부터의 출력전류와, 이 출력전류에 대하여 동상신호가 되는 다른 편의 포토다이오드(PD2)의 캐소드축으로부터의 출력전류와를 전류가산하고, 가산된 전류를 전류/전압변환기(1)에 의해 전압신호로 변환하고 있다. 이것에 의해 가산앰프 등의 회로를 생략할 수 있고, 하나의 전류/전압변환기(1)로 끝나고, 회로규모를 작게 억제하면서 광자기신호의 재생시의 잡음을 저감할 수 있다. 이것에 의해 재생신호의 S/N비를 향상시켜, 예를 들면 디지털시스템에 있어서의 에러레이트를 대폭으로 개선시킬 수 있고, 신뢰성-정보밀도-전송속도의 향상을 도모할 수 있다.

Magneto-optical storage device

Apparatus for reading a landscape area of a moving storage medium

Optical head for scanning a record carrier

서로 다른 두께를 갖는 제 1 및 제 2 형태의 광 기록매체(2; 40)를 주사하는 장치는 서로 다른 파장의 제 1 및 제 2 방사빔을 발생한다. 제 1 방사빔(17)은 제 1 개구수 NA 1 을 갖는다. 제 2 방사빔(46)은 NA 1 보다 작은 유효 제 2 개구수 NA 2 를 갖는다. NA 2 보다 작은 NA를 갖는 제 2 방사빔의 광속들은 중앙 서브빔(48)을 형성하며, 더 큰 NA를 갖는 광속들은 외부 서브빔(49)을 형성한다. 이 장치는, 제 1 방사빔에 영향을 미치지 않는 비주기적 위상 구조를 갖는다. 도입된 구면수차는 투명층들(3; 41)의 두께의 차이에 기인한 구면수차의 차이를 보상한다. 외부 서브빔(49)에 있는 광속들로부터 검출계(25) 상에 떨어지는 표유 광의 양을 줄이기 위해, 위상 구조는 제 2 방사빔(17)에 일정한 양의 초점 흐려짐을 도입한다. 이것은 외부 서브빔에 대해 중앙 서브빔의 초점을 변위시켜, 중앙 및 외부 서브빔의 강도 분포가 2개의 분리된 분포로 분할되도록 한다. 검출계의 위치와 크기가 적절히 선택되면, 검출계는 중앙 서브빔으로부터의 광속을 주로 포착하며 외부 서브빔으로부터의 광속은 포착하지 않는다. 따라서, 초점들의 변위는 제 2 방사빔의 원하는 광속들과 원치 않는 광속들의 검출계(25)의 평면에서의 공간 필터링를 허용한다. 기록매체, 광학 헤드, 중앙 서브빔, 위상 구조, 구면수차, 초점 흐려짐

Optical pickup

본 발명은 광디스크 등의 광기록매체상에 데이터를 기입, 또는 광기록매체상에 기록된 데이터를 판독하는 장치의 광 픽업을 소형화 및 경량화하여 광 픽업의 장착공간의 축소화를 도모하여, 장치 전체의 소형화 및 경량화함을 과제로 한다. According to the present invention, the optical pickup of an apparatus for writing data on an optical recording medium such as an optical disc or reading data recorded on the optical recording medium can be reduced in size and weight, thereby reducing the mounting space of the optical pickup, The object is to reduce the size and weight. 본 발명은 상기 과제를 해결하기 위하여 광원과, 광기록매체상에서 반사된 광중에서 데이터 신호성분을 수광하는 제1의 수광부와, 상기 데이터 신호성분 이외의 신호성분을 수광하는 제2의 수광부를 동일 면상에 배치한 기대부를 갖추며, 광기록매체로부터의 반사광을 데이터 신호성분과 기타의 신호성분으로 분리하고, 상기 데이터 신호성분을 소정의 입사각으로 보정수단에 입사시킴과 동시에, 상기 기타의 신호성분을 투과하는 분리수단과, 이 분리수단으로부터의 데이터 신호성분을 상기 제1의 수광부에 입사시킴과 동시에, 상기 기타의 신호성분을 투과하는 보정수단과, 보정수단을 투과한 상기 기타의 신호성분을 회절하여 상기 제2의 수광부에 입사시키는 회절수단을 갖춘 광 픽업을 제공한다. SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a light source, a first light receiving unit for receiving a data signal component among light reflected on an optical recording medium, and a second light receiving unit for receiving signal components other than the data signal component. An anticipated portion arranged on the substrate; the reflected light from the optical recording medium is separated into a data signal component and other signal components, and the data signal component is incident on the correction means at a predetermined angle of incidence and transmitted through the other signal components. And a separating means for entering the data signal component from the separating means into the first light receiving portion, diffracting the correcting means for transmitting the other signal components, and the other signal components passing through the correction means. An optical pickup having diffraction means incident on the second light receiving portion is provided.

Information reading device

Optical pickup and opto-magnetic signal reproducing apparatus

본 발명은 광픽업에 관한 것으로, 광픽업은 복굴절성(複屈折性) 재료단체(單體)에 의하여 형성되는 편광분리소자를 구비한다. 분리소자는 접합단체의 광학축을 정밀하게 맞추어 접합시킬 필요가 없다. 분리소자를 이루는 복굴절성 결정내의 다중반사는 매체 표면 배면에서 반사된 광선으로부터 추출되는 편광성분의 분리 및 해상도를 개선한다. The present invention relates to an optical pickup, and the optical pickup has a polarization splitting element formed by a single birefringent material. The separation element does not need to precisely align and join the optical axis of the bonded body. Multiple reflections within the birefringent crystal that make up the separation element improve separation and resolution of polarization components extracted from the light rays reflected from the back surface of the media surface.

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.

Optical information recording / reproducing device

Optical disc recording and reproducing apparatus and method

본 발명은 광디스크 기록재생장치 및 방법에 관한 것이며, 간단한 구성으로 고밀도로 광디스크에 정보를 기록 또는 재생한다. 대물렌즈(27)와 선옥(先玉)렌즈(28)를 렌즈홀더(71)에 고정한다. 렌즈홀더(71)를 액추에이터(72)로 일체적으로 포커스 제어한다. 광자기디스크(1)의 기판(61)의 두께는 0.3㎜ 이하로 한다. 대물렌즈(27)와 선옥렌즈(28)의 총합의 개구수는 0.8 이하로 한다. The present invention relates to an optical disc recording and reproducing apparatus and method, and records or reproduces information on an optical disc with a high density with a simple configuration. The objective lens 27 and the jade lens 28 are fixed to the lens holder 71. The lens holder 71 is integrally focused with the actuator 72. The thickness of the substrate 61 of the magneto-optical disk 1 is 0.3 mm or less. The numerical aperture of the sum total of the objective lens 27 and the prison lens 28 is 0.8 or less.

A super-resolution optical head device

직선편광의 코히어런트 광원에서 출사되는 광빔은 편광성 위상판에 입사하고, 서로 직교하는 편광성분을 갖는 주빔과 중심위치 및 주요부 사이즈가 일치하는 쌍봉상의 부빔을 생성한다. 주빔 및 부빔은 광디스크의 정보기억면에 집광되고, 반사후에 편광분리되어 별도로 제1~ 제3광검출기에 의해 검출된다. 제1~ 제3광검출기에서의 출력신호는 차동연산기에 의해 연산되고 출력된다. The light beam emitted from the linearly polarized coherent light source is incident on the polarizing phase plate and generates a bimodal subbeam having a central position and a main portion size coincident with the main beam having the polarization components orthogonal to each other. The main beam and the sub-beams are focused on the information storage surface of the optical disk, and after reflection are polarized to be separately detected by the first to third photodetectors. Output signals from the first to third photodetectors are calculated and output by a differential operator.

Optical pickup and manufacturing method thereof

Method and device for reproduction of optical information

Seperator of polarized light beam and light detector using same

本发明揭示一种偏振光束分束器，包括表面形成周期性凹凸栅的光学各向同性或双折射基片，在基片凹凸部的至少凸部上形成由聚联乙炔定向膜或与基片不同的材料组成的双折射层，其厚度及基片凹部深度的设定使凹凸部间对寻常光或异常光的相位差为π的偶数倍。也可以在光学各向同性材料基片上形成有周期性凹凸栅的双折射层、凹部充填折射率等于双折射层的寻常光折射率或异常光折射率的材料。或在双折射基片的凹部充填其折射率与双折射材料的寻常光及异常光折射率有特定关系的光学各向同性物质。

Disk drive system and method for operating same

一种盘驱动装置,使用两滑板,它们在一舵杆的驱动下以相反方向滑动。每一滑板有一容纳设在光盘盒容器上的两突销之一的狭槽。滑板的滑动可驱动两突销沿着两狭槽移动,从而按照舵杆转动方向上举或降下光盘盒容器。这样,啮合在S形狭槽中的突销的滑动把一光盘从驱动器心轴上卸下或把它装到其上。当突销沿其狭槽滑动时,光盘的上举和降下以把光盘盘心从心轴磁铁上剥离下来的方式而并非垂直举离心轴的方式进行。

Optical information processing device

가이드 소자를 사용하는 광 디스크 장치등의 광정보 처러 장치로서, 장치 전체로서의 신뢰성을 향상시키기 위해, 기판, 그 기판상에 형성된 광 가이드와 반사 광빔을 상기 광 가이드로 안내하는 격자커플러 및 상기 광 가이드내의 가이드 광빔을 검출하는 광 검출부를 각각 구비하는 여러개의 집적 광 검출부를 포함한다. 이러한 광정보 처리 장치에 의해 입사 결합부에서의 입사 각도나 입사 위치의 오차 허용량을 크게되고 입사 효율이 향상되어 장치의 신뢰성이 향상된다.

Optical pickup device for magneto-optical recording media

워블링 트랙이 형성되어 있는 광자기 기록 매체용 광 픽업 장치는 광원, 대물 렌즈 및 편광 비임 분광기를 포함한다. 광원은 직선 편광된 발산 광 비임이다. 대물 렌즈는 광원에 의해 방출된 광 비임을 광자기 기록 매체상에 수렴하고, 광자기 기록 매체로부터 반사된 광을 수렴한다. 편광 비임 분광기는 광원과 대물 렌즈 사이의 발산/수렴 광로에 배치되어 발산/수렴 광로로부터 광자기 기록 매체로부터의 반사 광 비임을 분리시킨다. 광원은 광원에 의해 방출된 광 비임의 편광면이 광자기 기록 매체의 트랙에 수직으로 되도록 배치된다. 편광 비임 분광기른 광축상에 있는 광원에 의해 방출된 광 비임의 성분에 대응하는 광자기 기록 매체로부터 반사되는 광 비임의 성분 및 발산/수렴 광 경로로부터 준리되는 상기 반사된 광 비임 성분인 발산/수렴 광로로부터 분리된 광의 성분을 또한 포함하는 평면이 광자기 기록 매체의 트랙에 수직으로 되도록 배치된다.

Optical magneto recording/reproducing apparatus

본 발명은 광자기 기록/재생 장치에 관한 것으로서, 구조를 단순하게 하고, 조립 및 조정을 용이하게 하기 위하여, 광빔을 출사하는 광원과 상기 광빔을 기록매체로 집속하는 대물렌즈와 상기 광원과 상기 대물렌즈 사이의 광경로상에 위치하여 입사방향에 따라 입사빔의 진행경로를 결정하는 광경로변환수단과 상기 광경로변환수단을 통과한 광빔의 광경로상에 배치되어 상기 광자기디스크에서 반사된 광빔중 진동면이 커각만큼 회전된 광빔을 회절시키는 제1홀로그램소자와 상기 제1홀로그램소자를 통과한 광빔을 다수개로 분리하는 제2홀로그램소자와 상기 홀로그램소자들을 통과한 광빔을 수광하는 광검출수단을 구비하여 된 것을 특징으로 한다. 상술한 홀로그램소자들을 채용함으로서, 구조가 단순해진 광 자기 기록/재생 장치를 구현할 수 있다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical recording / reproducing apparatus, comprising a light source for emitting a light beam, an objective lens for focusing the light beam on a recording medium, and the light source and the object in order to simplify the structure and facilitate assembly and adjustment. An optical path shifting means positioned on an optical path between the lenses and determining an advancing path of the incident beam according to the incident direction, and an optical beam disposed on the optical path of the optical beam passing through the optical path converting means and reflected from the optical magnetic disk; A first hologram element for diffracting the light beam rotated by an oscillation plane, a second hologram element for separating a plurality of light beams passing through the first hologram element, and light detecting means for receiving a light beam passing through the hologram elements Characterized in that. By employing the above-described hologram elements, the magneto-optical recording / reproducing apparatus can be realized with a simple structure.

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.

Optical pickup device and disc player device

수발광(受發光)소자 (레이저커플러)를 사용한 소형, 고성능의 광학픽업장치로서, 더욱 상세하게는 광자기기록매체에 대한 양호한 기록재생을 행할 수 있는 광학픽업장치를 제공한다. A small, high performance optical pickup device using a light emitting element (laser coupler) is provided, and more particularly, an optical pickup device capable of performing good recording and reproducing of an optical magnetic recording medium. 광검출기상에 배설되는 프리즘을 복굴절성(複屈折性) 결정(結晶)재료에 의하여 형성하고, 이상(異常)광선을 수광하는 광검출기를, 이상광선의 이른바 워크오프(walk -off)에 대응시켜 횡방향으로 벗어난 위치에 형성한다. 반사광속(光束)이 각 광검출기의 수광면상에 형성하는 스폿의 강도분포로부터, 트래킹에러신호를 검출한다. A photodetector for forming a prism disposed on the photodetector by a birefringent crystalline material and receiving abnormal light corresponds to a so-called walk-off of the abnormal light. It is formed at the position deviated laterally. The tracking error signal is detected from the intensity distribution of the spot in which the reflected light beam is formed on the light receiving surface of each photodetector.

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 with a hologram to limit the aperture of two light beams with different wavelengths

An optical pickup device that is able to record/reproduce information signals for first and second optical discs with different recording capacities. The optical pickup device includes an objective lens for converging first and second light beams of different wavelengths on the signal recording layers of first and second optical discs having different substrate thicknesses, a beam splitter having the same transmittance to the first and second light beams and configured for separating the first and second light beams radiated by first and second light sources to fall on the beam splitter via a first objective lens or a second objective lens, and a hologram element arranged between the objective lens and the beam splitter for limiting the aperture of one of the first light beam and the second light beam and for correcting the spherical aberration caused by difference in the disc substrate thickness of the first and second optical discs. This configuration enables various optical elements, such as objective lens or beam splitter, to be used in common for the optical disc of different recording capacities.

Magnetooptical information recording and reproducing apparatus

In a magnetooptical information recording- reproducing apparatus, recording of information is performed such that laser beam is irradiated on a magnetooptical information recording medium via an optical head while applying a magnetic field to the beam irradiated portion of the recording medium onto which information pits are formed by utilizing the difference in the direction of magnetization of thereof. The magnetooptical information recording-reproducing apparatus is provided with a band-like shielding plate which is arranged in an optical path of a reflected light from the recording medium upon application of laser beam thereto in a direction perpendicular to tracks of the recording medium. Reproduction of information recorded on the recording medium is effected by detecting the beam which is not shielded by the shielding plate by use of a photodetector.

Recording method and apparatus for optical recording medium with a laminated structure having ROM and RAM layers

The recording method for an optical recording medium with a laminated structure with a ROM layer, from which data having been recorded beforehand can be read out, and a RAM layer, from which data is read out and in which data is recordable, includes: emitting laser light that has two or more pulses per record unit of a RAM record mark, which is recorded as data on the RAM layer, thereby recording the RAM record mark.

OPTICAL SYSTEM FOR OPTICAL DISK DRIVE

Système optique pour un lecteur de disque optique pour lire/ écrire des données sur un disque optique (2), le système optique comprenant une source de lumière (7) émettant un faisceau laser parallèle, un déflecteur (26) ayant une surface de miroir mobile en rotation, le faisceau laser parallèle émis par la source de lumière étant incident sur la surface de miroir du déflecteur (26) et étant réfléchi vers un système de lentilles d'objectif (10) qui fait face au disque optique (2). Un système de lentilles relais (29, 30) est disposé entre le déflecteur (26) et le système de lentilles d'objectif (10) de façon que la surface de miroir et le plan principal avant du système de lentilles d'objectif (10) aient une relation sensiblement conjuguée. Optical system for an optical disc player for reading/writing data on an optical disc (2), the optical system comprising a light source (7) emitting a parallel laser beam, a baffle (26) having a movable mirror surface in rotation, the parallel laser beam emitted by the light source being incident on the mirror surface of the deflector (26) and being reflected towards an objective lens system (10) which faces the optical disc (2). A relay lens system (29, 30) is disposed between the deflector (26) and the objective lens system (10) such that the mirror surface and the front major plane of the objective lens system (10 ) have a substantially conjugate relationship.

Polarization diffraction element and polarization detector employing the same

A polarization diffraction element comprising two diffraction gratings formed on both faces of a substrate respectively. Both the diffraction gratings have grating lines which are arranged at the same grating pitch, and whose directions mutually form a predetermined minute angle. The grating lines may also be arranged parallel to each other. In this case, the relationship between grating pitches D1, D2 of the respective diffraction gratings and the wavelength .lambda. of an incident light is expressed as: 0 < ¦ .lambda.(1/D1 - 1/D2)(1 - (.lambda./2D1)2) - (1/2) ¦ ~ 0.35; or 0 < ¦ .lambda.(1/D1 - 1/D2)(1 - (.lambda./D1 - .lambda./2D2)2) - (1/2) ¦ ~ 0.35 In a polarization detector employing this polarization diffraction element, a single converging lens of a small effective diameter separates one polarization from another polarization and converges them separately on different photodetectors. Consequently, a still more compact and lightweight optical pickup can be manufactured.

MAGNETO OPTICAL READER OPTIMIZED BY THE INCIDENT LIGHT POLARIZER

Patent FR2664394B1

DEVICE FOR OPTICAL RECORDING / READING OF AN INFORMATION MEDIUM

Magneto-optically read data recording medium and process and device for recording and reading applying same

The recording medium includes a substrate (10) carrying a first magneto-optical layer (12), which carries a dichroic decoupling layer (18). It is surmounted by a second magneto-optical layer (16) having a Curie point which differs from that of the first layer. The reading device includes two polarised light sources (the light of the longer wavelength being that for which the dichroic layer (18) is transparent), a dichroic plate for recombining the two beams, a lens for projecting the combined beams onto the medium and means for detecting the rotation of one and the other of the beams originating from the sources.

Optical head device and a diffraction element suitable for the device, and a method of manufacturing the diffraction element and the optical head device

복굴절성을 갖는 광기록매체에 대해서도 정보를 읽어낼 수 있도록 하기 위해 단면이 요철 형상인 회절격자 (21) 를 형성하는 광학재료, 및 회절 격자 (21) 의 적어도 오목부에 충전되는 별도의 광학재료 (22) 를 구비하고, 상기 2 종류의 광학재료 (21, 22) 중 적어도 한 쪽이 복굴절성을 나타내고, 다른 쪽 광학재료 (22) 가 복굴절성을 나타내는 한 쪽 광학재료 (21) 의 정상 광선굴절율과 이상 광선굴절율 중 어느 쪽과도 다른 굴절율을 갖도록 한다. Optical material for forming a diffraction grating 21 having a concave-convex shape in cross section so as to be able to read information about an optical recording medium having birefringence, and a separate optical material filled in at least the concave portion of the diffraction grating 21. (22), wherein at least one of the two kinds of optical materials (21, 22) exhibits birefringence, and the other optical material (22) exhibits a normal light beam of one optical material (21) The refractive index and the abnormal light refractive index are different from each other. 또, 회절 효율이 높고 면내 분포가 균일한 편광계의 회절 소자를 얻기 위해, 대향하는 2 장의 기판 (2) 중 하나에 배향처리막 (11) 을 형성하고, 대향하는 기판 (2) 사이에 간격을 일정하게 유지하는 스페이서 (12) 와 고분자 액정 박막 (1) 이 되는 액정을 위치시키고 액정을 배향시켜 광조사에 의해 액정을 경화하여 고분자 액정 박막 (1) 으로 한 후, 한 쪽 기판을 떼내어 고분자 액정 박막 (1) 에 단면이 요철 형상인 격자를 형성하여 요철부에 등방성 매질을 충전한다. In addition, in order to obtain a diffraction element of a polarization system having a high diffraction efficiency and a uniform in-plane distribution, an alignment treatment film 11 is formed on one of the two substrates 2 facing each other, and a gap is formed between the substrates 2 that face each other. Place the liquid crystal to be a spacer 12 and the polymer liquid crystal thin film 1 to be kept constant, orient the liquid crystal to cure the liquid crystal by light irradiation to form a polymer liquid crystal thin film (1), and then remove one substrate and In the liquid crystal thin film 1, a lattice having a concave-convex cross section is formed to fill an uneven portion with an isotropic medium.

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.

Optical head for recording and reproduction of optical disc data

La présente invention concerne une tête optique où une lumière émise par un émetteur (103) est transmise vers un premier séparateur de faisceau (108) à sélectivité de polarisation pour produire un faisceau diffracté d'ordre 0 et deux faisceaux d'ordre (1. Un hologramme (106) est agencé entre l'émetteur (103) et le séparateur (108) pour convertir l'angle de diffusion selon un rapport spécifié. Le faisceau émergeant du séparateur (108) est condensé sur un disque optique (110) qui renvoie la lumière vers un détecteur à travers un deuxième séparateur (116) à sélectivité de polarisation. On obtient lors de l'enregistrement une tache image provenant d'une onde sphérique sans aberration et en corrigeant la phase lors de la reproduction on obtient un rapport signal/bruit élevé, un signal d'erreur de localisation et un signal de suivi de piste stables. L'invention concerne aussi le procédé de fabrication d'une telle tête optique.

OPTICAL READ / WRITE MEMORY SYSTEM AND APPARATUS FOR READING AND / OR WRITING ON OPTIMALLY DETECTED DATA ON A FLEXIBLE SUPPORT

L'invention concerne un système de mémorisation par lecture/écriture, destiné à lire et écrire des données, pouvant être détectées optiquement, sur un support optique ou magnéto-optique souple. Il comprend une tête de lecture/écriture optique pouvant être amenée par un bras 30 au-dessus d'un support souple sur lequel elle applique une lumière focalisée et de laquelle elle reçoit la lumière réfléchie. Les moyens de stabilisation fine sont placés à proximité du support souple pour stabiliser ce dernier dans une position souhaitée afin qu'il ne soit pas nécessaire à la tête optique de se rapprocher ou s'éloigner sensiblement du support pour maintenir la lumière focalisée sur ce dernier. Domaine d'application : systèmes de mémorisation optiques d'informations, etc. The invention relates to a read / write storage system for reading and writing optically detectable data on a flexible optical or magneto-optical medium. It comprises an optical read / write head which can be brought by an arm 30 above a flexible support on which it applies a focused light and from which it receives the reflected light. The fine stabilization means are placed close to the flexible support to stabilize the latter in a desired position so that it is not necessary for the optical head to approach or move away substantially from the support to keep the light focused on the latter. . Field of application: optical information storage systems, etc.

Device for focussing light onto an object

The invention relates to a device for focussing light onto an object. Said device comprises at least one light source that is preferably formed by a laser. The inventive device also comprises at least one optical focussing element and a device for fixing the relative position of the focussing element and the object. The light which is sent through the focussing element is present in the form of a radially polarised ring mode.

DETECTION CIRCUIT FOR AN OPTICAL SIGNAL

Optical information storage device e.g. for reproduction of information stored on magnetooptical recording medium

Eine optische Informationsspeichereinheit zum Wiedergeben von auf Erhebungen und Rillen eines magnetooptischen Aufzeichnungsmediums aufgezeichneter Information mittels eines reflektierten Lichts, das von einem Lichtfluß erhalten wird, das von einer Lichtquelle emittiert, auf das Aufzeichnungsmedium gestrahlt und vom Aufzeichnungsmedium reflektiert wurde. Die optische Informationsspeichereinheit enthält eine erste Wellenplatte, auf die das reflektierte Licht von dem magnetooptischen Aufzeichnungsmedium einfällt; ein Beugungsgitter, auf das das Licht einfällt, das durch die erste Wellenplatte durchgelassen wurde; eine zweite Wellenplatte, auf die das Licht einfällt, das durch das Beugungsgitter durchgelassen wurde; und eine Polarisation-Detektiereinheit, auf die das Licht einfällt, das durch die zweite Wellenplatte durchgelassen wurde.

Optical pickup and optical disk device

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.

OPTO-ELECTRONIC METHOD FOR READING INFORMATION CONTAINED ON A MAGNETIC MEDIUM AND CIRCUIT FOR IMPLEMENTING IT

Photomagnetic head apparatus

A photomagnetic head apparatus includes a beam splitter which splits a laser beam, reflected by concentric recording tracks of a rotating photomagnetic recording disc, into three bundles of rays. The three bundles of rays have different polarization directions in a plane which lies in a radial direction of the recording tracks. One of the three bundles of rays is used as a servo-signal light, and the remaining two bundles of rays are used as data signal lights. A defocusing diffraction element splits at least the servo-signal light into a least two bundles of rays in a direction corresponding to the tangential direction of the recording tracks, substantially perpendicular to the split direction of the beam splitter and which provides at least two split lights with a predetermined amount of positive or negative defocus in an optical axis direction. A pair of servo-signal light receiving elements receive the split beams of the servo-signal light produced by the defocusing diffraction element. A data light receiving element receives the data signal lights. The defocusing diffraction element is made of a non-circular element whose numerical aperture in the tangential direction of the recording tracks is smaller than the numerical aperture in the radial direction.

Magneto-optical head

Optical memory apparatus

본 발명에 의한 광학적 기억장치는 광학적 기억매체에 액세스하기 위한 적어도 1개의 기구가 배치되는 드라이브베이스와, 드라이브베이스의 면에 형성된 블록을 갖추며, 드라이브베이스의 단부에 광을 발광하는 발광소자와 상기 광학적 기억매체로부터의 복귀광을 검출하는 광검출기가 부착되고, 상기 블록의 면에 광을 안내하기 위한 광학부품의 적어도 일부가 접촉하여 상기 광학부품의 위치가 결정되도록 배치된 것을 특징으로 한다. An optical memory device according to the present invention comprises a drive base on which at least one mechanism for accessing an optical storage medium is arranged, a block formed on a surface of the drive base, and a light emitting element emitting light at an end of the drive base and the optical A photodetector for detecting the return light from the storage medium is attached, and at least a part of the optical component for guiding the light is brought into contact with the surface of the block so that the position of the optical component is determined.

Optical head for optical disk device

Super-resolution optical head apparatus

A linearly polarized light beam emitted from a coherent light source reaches a polarizing phase plate and is thereby divided into a primary beam and a subsidiary beam having a polarized light component perpendicular to the polarized light component of the primary beam and a double-humped pattern, in which the center position coincides with the center position of the primary beam and the principal portion is equal in size to the principal portion of the primary beam. The primary beam and the subsidiary beam are focused onto an information storage surface of an optical disk and reflected therefrom, so that they are separated again through polarization separation and individually detected by first to third optical detectors. The output signals from the first to third optical detectors are calculated by a differential calculator and outputted therefrom.

Converter for magnetic recording and reproducing

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

OPTICAL SYSTEM FOR OPTICAL DISK DRIVE

Système optique pour un lecteur de disque optique pour lire/ écrire des données sur un disque optique (2), le système optique comprenant une source de lumière (7) émettant un faisceau laser parallèle, un déflecteur (26) ayant une surface de miroir mobile en rotation, le faisceau laser parallèle émis par la source de lumière étant incident sur la surface de miroir du déflecteur (26) et étant réfléchi vers un système de lentilles d'objectif (10) qui fait face au disque optique (2). Un système de lentilles relais (29, 30) est disposé entre le déflecteur (26) et le système de lentilles d'objectif (10) de façon que la surface de miroir et le plan principal avant du système de lentilles d'objectif (10) aient une relation sensiblement conjuguée. Optical system for an optical disc drive for reading / writing data on an optical disc (2), the optical system comprising a light source (7) emitting a parallel laser beam, a deflector (26) having a movable mirror surface in rotation, the parallel laser beam emitted by the light source being incident on the mirror surface of the deflector (26) and being reflected towards an objective lens system (10) which faces the optical disc (2). A relay lens system (29, 30) is disposed between the deflector (26) and the objective lens system (10) such that the mirror surface and the front principal plane of the objective lens system (10) ) have a substantially conjugate relationship.

BUNDLE ANALYSIS DEVICE FOR DEVICES FOR OPTICAL RECORDING.

Changes in the plane of polarisation of the laser beam (4) are measured by a photodetector array (21) on a substrate (20) with a system of imaging mirrors (22-24) under a parallel plate (25) of high-quality optical glass, whose underside is covered with a beamsplitting system (26) of dielectric multilayers. One mirror (24) rotates the polarisation plane of the obliquely incident beam through 45 deg. w.r.t. the beamsplitter (26), from which two partial beams (202,203) are directed to the photodetector array (21). The tilted mirror (24) may have either circular or stripe geometry with compensation for the astigmatism introduced when the convergent beam (202) traverses the glass plate (25) obliquely.

Optical head unit

본 발명의 목적은 소형으로 구성되는 동시에 정확한 반사광빔의 검출이 가능하도록 한 광학헤드를 제공하는 것이다. 본 발명에 따라 광원, 대물렌즈, 분리광학계 및 포토디텍터. 대물렌즈는 광원에서 출사된 광빔을 광자기 기록매체의 신호기록면에 초점을 맞추도록 조사하고, 분리광학계는 광원에서 출사된 광빔과 대물렌즈를 통해 다시 입사한 광자기 기록매체의 신호기록면으로부터 되돌아오는 빔을 분리하고, 포토디텍테와 분리광학계에 의해 분리된 신호 기록면으로부터의 되돌아오는 광빔을 수광하고, 분리광학계는 되돌아오는 빔의 카회전각을 외관상 증가시키는 인핸스소자를 포함하는 광자기 기록매체용 광헤드이다.

Polarizing beam splitter and magneto-optic reading device using the same

一个光学偏振分束器具有薄层(8-13)组成的堆，堆包括毗邻补偿堆(11-13)的偏振堆(8-10)。偏振堆包括多个交替地具有第一折射率n w 和第二折射率n h 的连续层。补偿堆包括一系列半波长厚度及折射率分别为n 1 、n 2 和n 3 且符合关系n 3 ＜n 2 ＜n 1 的三个连续层。补偿堆使分束器在透射或反射光束的两个互相垂直的偏振方向引入最小的相位差。分束器适用于把发散或会聚光束分为一定的偏振分量的光学系统。

Magnetooptical recording/reproducing apparatus

Optical head, magneto-optical head, disk apparatus and manufacturing method of optical head

The present invention relates to an optical head, a magneto-optical head, and a disk apparatus, that have high light efficiency, can realize high-density recording medium and perform high-speed recording and reproduction, and can prevent erroneous record or erroneous reproduction, and a manufacturing method of the optical head. When a converged beam enters an incident surface of a transparent condensing medium, its refracted beam is condensed on a light-condensed surface and forms a light spot. Since leaking out to an aperture formed on an outer surface of the light-condensed surface of this light spot, near field light is scattered by a micro metal member. In addition, since, also in the micro metal member, plasmon resonance occurs by the irradiation of a laser beam, near field light leaks out therefrom. This near field light becomes propagation light and enters a recording medium of a disk, and recording into the recording medium is performed by this light.

Optical information recording and reproducing device

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Magneto-optical disk reading apparatus and method

Recording medium on which information is magneto-optically recorded is irradiated with a linearly polarized light beam. A light beam reflected from or passed through the recording medium is changed in phase by a wave plate. Through an analyzer the differently polarized components of the light beam from the wave plate are combined by aligning the polarizing directions of the light beam. The light intensities of the forward and backward parts of the moving direction of the recording medium in the far field of the light beam from the analyzer are detected by a photo detector. A difference between the detected signals of the forward and backward parts is generated to reproduce the information recorded on the recording medium. Furthermore, the light beam from the wave plate is splitted into two light beams linearly polarized in mutually orthogonal directions. Two light intensities of the two light beams for the forward and backward parts of the moving direction of the recording medium in the far field of the respective light beams are detected by two photo detectors. Two differences between the outputs from the two photo detectors are determined by two subtractors. A difference or sum between the two subtractors is determined and the information is reproduced on the basis of thus determined difference or sum.

Optical system for two-dimensional positioning of light beams

A positioning system for selectively directing a first beam of light towards a destination and a second beam of light towards a first diffractive optic. The first beam of light and the second beam of light traverse a substantially co-linear optical path. The first diffractive optic diffracts the second beam of light into a plurality of optical spots. The second beam of light comprising the plurality of optical spots is directed onto a second diffractive optic. A change in position of the plurality of optical spots relative to the second diffractive optic is sensed in a reflection of the second beam of light by a detection element and representative signals are derived thereof. The signals are coupled to a directing assembly, which directs the first beam of light towards the destination.

Optical information recording medium

An optical information recording medium capable of reproducing RAM information constantly during concurrent reading of ROM-RAM information, comprising a substrate having a ROM region in which phase pits working as ROM signals are imprinted, and a magneto-optic recording film formed in a region corresponding to the ROM region in the substrate, for recording RAM signals, the modulation coefficient of the above phase pit being 15%-25%. In one embodiment, the width of the above phase pit is 0.29 μm to 0.37 μm. In another embodiment, the optical depth of the phase pit is about λ/8 to λ/10 (λbeing laser wavelength used in recording/reproducing).

FRONT LOADED OPTOMAGNETIC RECORDING APPARATUS HAVING A RETRACTABLE POLARIZATION MAGNETIC FIELD PRODUCTION DEVICE IN RELATION TO THE INTRODUCING MEDIUM RECORDING PATH

L'INVENTION CONCERNE UN APPAREIL D'ENREGISTREMENT OPTOMAGNETIQUE POUR ENVOYER UN FAISCEAU LUMINEUX SUR UN SUPPORT D'ENREGISTREMENT OPTOMAGNETIQUE 102 TOUT EN PROVOQUANT L'APPLICATION, PAR UN MOYEN DE PRODUCTION D'UN CHAMP MAGNETIQUE 8, DISPOSE PRES DU SUPPORT D'ENREGISTREMENT, D'UN CHAMP MAGNETIQUE DE POLARISATION SUR CE DERNIER, CE QUI PERMET L'ENREGISTREMENT D'INFORMATIONS SUR LE SUPPORT D'ENREGISTREMENT. LE SUPPORT D'ENREGISTREMENT OPTOMAGNETIQUE 102 EST INSERE DANS UNE DIRECTION SENSIBLEMENT LE LONG D'UNE SURFACE D'ENREGISTREMENT DU SUPPORT D'ENREGISTREMENT OPTOMAGNETIQUE, UN MECANISME 9-11 ETANT PREVU POUR RETIRER LE MOYEN DE PRODUCTION DE CHAMP MAGNETIQUE 8 HORS DU TRAJET D'INSERTION LORSQUE LE SUPPORT D'ENREGISTREMENT EST INSERE. APPLICATION : MINIATURISATION DES APPAREILS D'ENREGISTREMENT OPTOMAGNETIQUES.

Optical pick up

The optical pick up system is comprised of a beam generating from a semiconductor laser(1) being irradiated in parallel with an active layer xy-plane of the semiconductor laser(1) so that the beam get to be P-polarized when being irradiated at PBS(polarized beam splitter)(4); a hologram(12) being comprised of a couple of H1, H2, semicircle-type holograms; 6-division optical detector(11) determining position of the hologram(12) for a couple of a semicircle-type beam connected together by a couple of the holograms to maintain a predetermined interval each other; the interval between a couple of the semicircle beams on the 6-division optical detector(11) being equal to line width for 6-division.

Optical pick-up device, optical recording/reproducing apparatus and objective lens

An optical pickup device for improving the numerical aperture of an objective lens and for assuring high-reliability recording/reproduction of information signals. The optical pickup device has a first lens 6 having a curvilinear or planar surface facing an optical recording medium 5 and having the numerical aperture set to a pre-set value, and a second lens 3 arranged for clamping the first lens 6 between t and the optical recording medium 5. The optical pickup device also has a light-converging optical system for converging the reflected light from the surface of the optical recording medium 5 and a first movement unit 2 for moving the first objective lens 6 and the second lens 3 along the direction of the optical axis with respect to the second objective lens 3. The optical pickup device also has a second movement unit 11 for moving the first objective lens 6 along the direction of the optical axis relative to the second objective lens 3 and a fixation unit 12 for fixing the first objective lens 6 moved by the second movement unit 9. The method for adjusting the optical processing device includes a step of adjusting the position along the optical axis of the first objective lens 6 and a step of fixing the position of the first lens 6.

Optical head for magneto-optical information reproducing device

Optical head and optical information processing apparatus

Optical storage device

Optical information storage apparatus

An optical information storage apparatus is constructed to include a light source (1), a polarization beam splitter (2) reflecting light emitted from the light source and irradiating a reflected light on a recording surface of a recording medium, and an optical element (9), made of an optically transparent material, having an input surface to which light reflected by the recording surface and transmitted through the polarization beam splitter is input, and an output surface from which light is output. The optical element (9) is inclined within a plane which is perpendicular to a light incident surface of the polarization beam splitter and includes an optical axis along which light travels. In addition, the input surface and the output surface of the optical element are parallel to each other. The apparatus is suitable for reproducing high quality magneto-optic signals from a recording medium.

Compound prism including interfaces with curvatures of the order of a laser wave length

A compound prism including a plurality of unit prisms which have reflective interfaces defined by outer and/or inner surfaces thereof and which are arranged so that light is reflected by an inner surface of the interface of one of the unit prisms and by an outer surface of the interface of another unit prism.

Optical data storage

Magneto-optical recording medium and method for recording and reproducing and optical head designed for the magneto-optical recording medium

Optical pickup with a first detector to receive reflected data component signal and a second detector to receive reflected other component signal

An optical pickup irradiates a record surface of an optical storage medium with light and receives the light reflected by the record surface. The reflected light includes a data signal light corresponding to data recorded on the optical storage medium and other light. The optical pickup comprises a light source, a data photo detector, another photo detector, a base, a beam splitter, an introductive optical element, and a lens. The light source emits the light to the record surface. The data photo detector receives the data signal light. The another photo detector receives the other light. On the base, the light source, the data photo detector and the another photo detector are arranged. The beam splitter transmits the light from the light source and separates the reflected light from the optical record medium into the data signal light and the other light. The introductive optical element introduces the data signal light to the data photo detector and the other light to the another photo detector. The lens condenses the light from the light source transmitted through the beam splitter on the optical record medium and introduces the reflected light from the optical record medium to the beam splitter.

Polarization detector optical head

An optical head comprising of a laser source, a collimating lens, a focusing lens, a beam splitter, two polarizers, a quarter wave retarder, three detector lenses, and three photo detectors can be used to detect the polarization change of reflected light from an optical memory. Linear polarized light emerging from the laser source is collimated by the collimating lens and then is focused through the beam splitter and focus lens on the optical memory. Reflected light, which is elliptically polarized upon reflection from optical memory, is subdivided by the beam splitter into three parts: The first part goes through the quarter wave phase retarder followed by a polarizer whose transmission axis is set at 45 degrees, to reach a photo detector through a detector lens. The second part goes through a second polarizer, which has its transmission axis also set at 45 degrees, and then through the second detector lens to reach another photo detector. The third part of light that emerges from beam splitter goes directly to the third detector lens to reach the last photo detector. A simple and elegant equation is derived which relates the three light intensities detected by the photo detectors to the change of phase between the orthogonal electrical components of reflected light from optical memory. Such information is sufficient to detect the recorded information on the optical memory.

Storage apparatus

A storage apparatus, capable of record or reproduce of an optical information recording medium in which ROM information is recorded with phase pits and RAM information is recorded on top of a recording region of the phase pits, has a main controller that, when the output of the recording information detection system—a system for detecting reflected light of a laser beam from the optical information recording medium and generating signals corresponding to ROM and RAM information—simultaneously contains ROM and RAM signals corresponding to ROM and RAM information, performs negative feedback control of a semiconductor laser emission using ROM signal in the output of the recording information detection system and performs control so as to obtain read-out and played-back ROM signal from the output of an optical intensity detection system for detecting the intensity of the laser light.

Optical pickup and optical storage device

An optical pickup for an optical storage device includes a stem, a substrate mounted on the stem, and a laser diode mounted on the substrate. The substrate is integrally formed with an optical signal detector and an error signal detector for focusing error detection and tracking error detection. A cap is mounted on the stem so as to accommodate the substrate and the laser diode. A beam splitter unit including a polarization beam splitter and a beam splitting element is mounted on the cap. A hologram for diffracting a reflected beam toward the error signal detector is interposed between the cap and the beam splitter unit. The substrate is biased at a given potential, and has an insulating film opposed to the stem.

Optical head with a beam splitter

Magneto-optical pickup with optical modulus

자기광학효과에 의하여 정보의 기록·재생을 하는 광자기 픽업에 있어서, 광이용효율이 높고 충분한 SN 비의 광자기 신호가 얻어져서 신뢰성 및 내구성이 높은 소형이고 염가의 광자기 픽업을 제공하는 것을 목적으로 한다. 내부에 레이저 다이오드(17)와 포토 다이오드(18,19,20)가 구성된 광학 모듀울(15)과 일체로 P 편광과 S편광에서 반사율 및 투과율이 다른 편광 프리즘(23)을 설치하고, 광학 모듈울(15)의 내부에 프리즘형 검광자(24)를 설치함으로써 소형화를 꾀하면서 광이용효율의 향상과 광자기 신호의 충분한 SN 비를 확보할 수 있다. 또, 광학 모듀울을 밀봉하는 구조로 함으로써 신뢰성과 내구성이 높은 광자기 픽업을 제공할 수 있다.

System and method of using optical fibers in a data storage and retrieval system

An optical system and method for transmission of light between a source of light (101) and a magneto-optical storage location (107) along an optical path including: orthogonally aligned first and second single-mode polarization maintaining optical fibers (598, 599).

Magneto-optical head having heat sink layer

A magneto-optical recording head comprises a magnetic coil formed on a lower surface of a transparent substrate opposed to a magneto-optical disk. A heat sink layer is provided at the outside of the magnetic coil on the lower surface. An objective lens is supported on an upper surface of the transparent substrate. The heat, which is generated by the magnetic coil, is released via the heat sink layer to the space between the magneto-optical disk and the substrate. The release of the heat is facilitated by the air stream which is generated by the rotation of the magneto-optical disk. The heat can be effectively released from the magnetic coil without inhibiting optical characteristics of the objective lens.

OPTO-MAGNETIC SIGNAL PLAYER FOR READING INFORMATION, RECORDED ON A RECORDING MEDIUM THROUGH DIFFERENTIAL EVALUATION, USING A MAGNETO-OPTICAL EFFECT.

Optical scanning device for magneto-optical recording media

Apparatus and method for loading and unloading disc cartridges

디스크 카트리지를 로딩 및 언로딩하기 위한 장치가 두개의 슬라이더(베이스판의 각 측면에 하나씩 놓임)를 이용하며, 이는 틸러의 영향하에서 반대 방향으로 이동한다. 각각의 슬라이더는 카트리지 리시버 상에 제공된 두개의 리프팅 핀 중 하나를 수용하기 위한 슬롯을 갖는다. 상기 슬라이더의 이동으로 리프팅 핀이 상기 슬롯을 따라 구동되며, 따러서 상기 틸러의 회전 방향에 따라서 카트리지 리시버를 상승 및 하강시킨다. S형 슬롯에 결합된 리프팅 핀의 슬라이딩 동작으로 디스크는 드라이브 스핀들로부터 언로딩 되거나 그로부터 로딩된다. 상기 리프팅 핀이 각각의 슬롯을 따라 이동함에 따라, 디스크의 상승 및 하강은, 디스크 허브가 스핀들로부터 수직으로 들리는 것이 아니라, 스핀들 자석으로부터 박리되는 방석으로 수행된다. 이러한 시스템에서, 더스트 도어가 카트리지 리시버에 부착되며 로딩된 카트리지의 리벨 단부는 디스크가 로딩될 때 보이게 유지된다. 이러한 시스템을 암 상에 회전 가능하게 장착된 바이어스 코일 조립체를 포함하여 상기 코일 조립체는 디스크 카트리지로 로딩되거나 언로딩되며 디스크 카트리지의 이동 경로로부터 벗어나 배치된다. 바이어스 코일 암 회전은 슬라이더 중 하나에 의해 야기된다.

Magneto-optical pick-up with optical module