DATENAUFZEICHNUNGSMEDIUM, DATENAUFZEICHNUNGSGERÄT, DATENWIEDERGABEGERÄT UND DATENAUFZEICHNUNGS/WIEDERGABEGERÄT

Optischer Abtastkopf

Linsenantriebsgerät

Optisches Abtastgerät, optisches Plattengerät, und Verfahren zur Detektion eines Spurerkennungssignals

Leseanordnung für eine schreibbare optische Platte

OPTICAL RECORD MEDIUM REPRODUCING APPARATUS

Tracking servo system of recording-disc information recording and reproducing apparatus

A tracking servo system of a video or audio disc player, wherein the control data signals extracted from the electric signals read out from an information-carrying face of a video or audio recording disc are inhibited from being delivered from the servo system when the servo loop forming part of the system is open.

EQUIPMENT FOR OPTICAL SEIZING OF INFORMATION NOTED ON A CARRIER

SCHEIBENFORMIGER AUFZEICHNUNGSTRAGERKORPER UND VORRICHTUNG ZUM AUFZEICHNEN VON INFORMATIONEN AUF EINEM SOLCHEN AUFZEICHNUNGSTRAGERKORPER UND ZUM AUSLESEN VON AUF EINEM AUFZEICHNUNGSTRAGER GESPEICHERTEN INFORMATIONEN

OPTICAL SWEEP DEVICE.

MULTI-LAYER INFORMATION MEMORY SYSTEM

Method for track counting and corresponding apparatus for reading from and/or writing to an optical recording medium

Recording/reproducing apparatus for disc-shaped recording medium, photodetector and optical head

SYSTEM FOR DETECTING TRACKING ERROR OF AN OPTICAL HEAD

MOVING DIFFRACTION GRATING FOR AN INFORMATION TRACK CENTERING SYSTEM FOR OPTICAL RECORDING

SCAFFOLDING AND LOCKING DISCS THEREFOR

The invention relates to scaffolding and includes the use of aperture locking discs adapted to cooperate with vertical supports, and horizontal or diagonal brace members. The ends of the brace members are provided with pivotable locking wedges which can be driven down through said ends and through the apertures in the locking discs The apertures are all identically shaped and depending upon the intended purpose of the scaffold, certain surfaces of the ends of the brace members and the cooperating apertures are contacted by the locking wedges which thereby determines in which direction the horizontal members will extend.

APPARATUS FOR READING A DISC-SHAPED RECORD CARRIER

An apparatus for reading a disc-shaped record carrier on which information is stored in a preferably spiral-shaped track. Said information is read optically with the aid of a radiation beam, which via a directing system transfers the information contained in the scanning point of the record carrier to a read detector. The radial position of the scanning point is controlled with the aid of a control system which via a first pattern of radiation spots which is projected onto the record carrier receives information about said radial position and by means thereof controls the directing system. In order to ensure that the system is stable under all conditions use is made of a second pattern of radiation spots which are projected onto the record carrier, which pattern is radially shifted relative to the first pattern, and from which a control signal is derived with which the transfer function of the control system is varied so as to stabilize the control system.

DIGITAL INFO. STORAGE SYSTEM EMPLOYING MAGNETIC PLATE

DEVICE FOR OPTICALLY SCANNING AN INFORMATION TRACK ON A ROTATING INFORMATION CARRIER

AN OPTICAL PICKUP APPARATUS

CLOSED LOOP SERVO OPERATION FOR FOCUS CONTROL

A technique is disclosed for focus control of a beam of radiant energy, wherein a detector (712) of the beam has first (368) and second (376) output s responsive to a position of the focal point of the beam. A circuit is couple d to the outputs of the detector for producing an error signal representing a displacement of the focus from a predetermined position, wherein the error signal has a periodic characteristic relative to the displacement. A servo (700) responsive to the error signal restores the displaced beam to the predetermined position. A local feedback loop (344) is coupled to the output s of the detector, and includes first (360) and second (364) periodic function generators, each responsive to the error signal. The second periodic functio n generator has an output that differs from an output of the first periodic function generator by a phase angle, preferably 90 degrees. A first multipli er (332) multiplies the first output of the detector by the output of the first periodic ...

LIGHT EMITTER-RECEIVER DEVICE AND OPTICAL READING SYSTEM

The disclosure relates to a laser (L) and to at least one detector integrated side by side on one and the same substrate so that the laser emits, through the edge of the device, a light beam along a direction and so that the detector can detect, through the same edge of the device, a beam substantially parallel to this direction of emission. In a system for the optical reading of a recording medium, the light emitted is reflected by the medium to be read to the detector or detectors. A diffraction grating (RZ) that diffracts only diffraction waves with the same sign (positive for example) deflects at least a part of the light to the detector or detectors. Application to the reading of optical disks.

MORE AUFZEICHNUNGSTRAEGERKOERPER FOR OPTICAL DATA AND DEVICE TO THE WRITING OF DATA IN THE AUFZEICHNUNGSTRAEGERKOERPER.

RECORDING CARRIER FOR THE RECORDING OF OPTICAL INFORMATION AND DEVICE FOR THE RECORDING AND/OR RENDITION OF INFORMATION USING THIS RECORDING CARRIER.

Optical disk apparatus and tracking method

A tracking offset is reduced. The effect of an SPP signal fluctuation is reduced by using a variable mixing ratio DPP method, and a residual tracking offset is minimized.

Optical pickup

SYSTEME OPTIQUE A TROIS FAISCEAUX A GUIDAGE ASSERVI, POUR LECTURE SUR DEUX PISTES PARALLELES

SYSTEME OPTIQUE A TROIS FAISCEAUX A GUIDAGE ASSERVI, POUR LECTURE SUR DEUX PISTES PARALLELES. UN SUPPORT 13 EST POURVU DE PISTES DE GUIDAGE PARALLELES, ENTRE LESQUELLES SONT DISPOSEES DES PISTES D'ENREGISTREMENT DE DONNEES. TROIS FAISCEAUX LASER 25, 27, 29 EXPLORENT LE SUPPORT 13. POUR L'ENREGISTREMENT, LES DEUX FAISCEAUX LATERAUX 25, 29 SUIVENT DEUX PISTES DE GUIDAGE ADJACENTES, ET LE FAISCEAU CENTRAL 27 SUIT LA PISTE D'ENREGISTREMENT, POUR Y PRODUIRE DES MODIFICATIONS. EN LECTURE, LE FAISCEAU CENTRAL SUIT UNE PISTE DE GUIDAGE ET LES DEUX FAISCEAUX LATERAUX SUIVENT CHACUN UNE PISTE D'ENREGISTREMENT ENCADRANT LA PISTE DE GUIDAGE. UN DISPOSITIF DE DETECTION 57 RECOIT LE RAYONNEMENT REFLECHI, POUR COMMANDER LES DEPLACEMENTS LATERAUX D'UNE LENTILLE ASSERVIE 61. APPLICATION AUX APPAREILS D'EXPLOITATION DES SUPPORTS D'ENREGISTREMENT OPTIQUE.

OPTICAL METHOD OF RECORDING ON A DISC-SHAPED RECORD CARRIER BODY

OPTICAL SYSTEM HAS THREE BEAMS HAS GUIDANCE CONTROLLED, FOR READING ON TWO PARALLEL TRACKS

APPAREIL DE DETECTION OPTIQUE D'INFORMATIONS ENREGISTREES SUR UN SUPPORT

... a. Appareil de détection optique d'informations enregistrées sur un support b. Appareil caractérisé en ce qu'il comporte un moyen pour décaler la position de l'objectif par rapport à la surface d'enregistrement du support en fonction du signal de commande du chemin du faisceau, de façon à compenser les détériorations des conditions de focalisation du faisceau lumineux principal sur la surface d'enregistrement du support, provenant d'une variation de chemin du faisceau lumineux principal et du faisceau additionnel.

OPTICAL DETECTOR RECEIVING SET Of INFORMATION ENREGISTREES ON a SUPPORT

a. Appareil de détection optique d'informations enregistrées sur un support b. Appareil caractérisé en ce qu'il comporte un moyen pour décaler la position de l'objectif par rapport à la surface d'enregistrement du support en fonction du signal de commande du chemin du faisceau, de façon à compenser les détériorations des conditions de focalisation du faisceau lumineux principal sur la surface d'enregistrement du support, provenant d'une variation de chemin du faisceau lumineux principal et du faisceau additionnel. at. Apparatus for optical detection of information recorded on a medium b. Apparatus characterized in that it comprises a means for shifting the position of the objective with respect to the recording surface of the medium as a function of the control signal of the beam path, so as to compensate for the deterioration of the focusing conditions of the main light beam on the recording surface of the medium, originating from a variation of the path of the main light beam and of the additional beam.

OPTICAL METHOD OF RECORDING ON A DISC-SHAPED RECORD CARRIER BODY

DATA RECORDING MEDIUM, DATA RECORDING APPARATUS, DATA REPRODUCING APPARATUS AND DATA RECORDING/REPRODUCING APPARATUS

OPTICAL DISC REPRODUCING APPARATUS

The optical recording apparatus focusses a light beam, emitted from a laser light source, by an objective lens, applied in this state to an optical information recording medium. In the optical path between the laser light source and the objective lens is disposed a diffraction grating inclinedly with respect to the optical axis. This diffraction grating not only reflects the light beam emitted from the laser light source but also separates it into zero order as well as +1st order and -1st order diffracted light beams. Thus, this diffraction grating functions not only as a diffraction grating but also as a mirror. Copyright 1997 KIPO ...

OPTICAL PICKUP DEVICE, OPTICAL DISK UNIT AND METHOD FOR DETECTING TRACK DISCRIMINATING SIGNAL

PURPOSE: To enable the production of a track discriminating signal without increasing the number of components or complicating the constitution of the components, even when an optical recording medium adopting the 'land/groove system' such as e.g. 'DVD-RAM' is used. CONSTITUTION: A main light spot and a sub-light spot for the recording/ reproducing operation are formed on the optical disk. The sub-light spot is provided with the distance from an objective lens different with respect to the main light spot and also formed at the position where the equation S≒Pn/2 is valid when an absolute value of the distance with respect to the main light spot in the normal line direction of the recording track on the optical disk is expressed as S, the track pitch (distance between land part-land part) is expressed as P and n is integer. © KIPO & JPO 2002 ...

OPTICAL PICKUP AND AN OPTICAL DATA PROCESSING DEVICE USING THE SAME TO PREVENT DETERIORATION OF A TRACK ERROR SIGNAL DUE TO THE ADJACENT LAYER

PURPOSE: An optical pickup and an optical data processing device using the same are provided to correct inter-layer confusion without influence about the spot concentrated on the recording side of an optical recording medium when an optical axis difference occurs according to the driving of the objective lens. CONSTITUTION: An optical pickup comprises a light source, a light collecting unit, a diffraction element(2), a branch optical element, a 1/4 wave plate(8), a light receiving unit, and a correcting element. The correcting element is divided into at least two areas in the vertical plane of the optical axis. The area of the correcting element includes a sub-wavelength concavo-convex structure having a shorter period than the wavelength of incident light. In the sub-wavelength concavo-convex structure, groove directions of the adjacent areas intersect at right angle. The filling of the sub-wavelength concavo-convex structure is determined so that for the phase difference between the adjacent ...

OPTICAL PICKUP DEVICE AND AN OPTICAL DISC DEVICE, PARTICULARLY IN REFERENCE TO PERFORMING STABLE SERVO CONTROL

PURPOSE: An optical pickup device and an optical disc device are provided to stably control a servo by simple composition. CONSTITUTION: A light source(121) generates a beam irradiated on an optical recording medium(101). A beam splitting unit(122) divides an optical beam irradiated from the light source(121) into a main beam and sub-beams. A photo detecting unit(127) receives the main beam and the sub-beams reflected from a recording surface of the optical recording medium(101), and outputs signals corresponding the received optical beams. The beam splitting unit(122) deflects an optical beam which is a part of the optical beam irradiated from the light source(121) and is faced out of an aperture of an objective lens(126) which condenses the optical beam on the recording surface of the optical recording medium(101) to pass through the inside of the aperture of the objective lens(126), generates the two sub-beams, and simultaneously generates the main beam on the basis of another part of ...

OPTICAL DISC APPARATUS AND A PICKUP DEVICE, PARTICULARLY CONCERNED WITH SUPPORTING AN OPTIC DISC INCLUDING A PLURALITY OF SIGNAL LAYERS

PURPOSE: An optical disc apparatus and a pickup device are provided to make it possible to adopt one spot push-pull type for enabling the detection of a DPD(Differential Phase Detection) signal and the support of an optical disc having a plurality of signal layers. CONSTITUTION: A light emitting unit(1) emits a signal light beam onto an optical disc. A photo-detector(9) includes at least three light detection portions disposed along a track direction of the optical disc. Each light detection portion receives the light reflected from the optical disc and generates corresponding output. A tracking error signal generator(22) generates tracking error signals of at least two types, using the outputs from the three light detecting portions. A tracking controller(25) performs the tracking control of the optical disc based on the tracking error signal. © KIPO 2007 ...

OPTICAL PICKUP DEVICE AND OPTICAL DISC DEVICE PROVIDED WITH THE SAME

Provided are an optical pickup device wherein generation of unnecessary light is suppressed, and an optical disc device provided with such optical pickup device. The optical pickup device in the optical disc device is provided with a diffraction grating having a diffraction surface section, which splits first wavelength light into at least a first main beam and a first sub-beam, splits second wavelength light into at least a second main beam and a second sub-beam and is applicable to the second wavelength light. A distance Ys (cd) between a first main light receiving section (74a) to which the first main beam is applied and first sub light receiving sections (74b, 74c) to which the first sub-beam is applied from an optical detector (73) is changed, with respect to a distance between a first main light receiving section to which the first main beam is applied and a first sub light receiving section to which the first sub-beam is applied from a standardized optical detector. COPYRIGHT KIPO ...

DEVICE FOR SCANNING A HOLDER DISK-SHAPED INFORMATION

Cross-talk cancellation in three-spots push-pull tracking error signal in optical disc systems

A method and system for cross-talk cancellation in a three-spots push-pull tracking error signal in an optical disc system is disclosed. A tracking error signal (TES) is determined from a plurality of error signals (PPa, PPb, PPc). A noise signal (N) is determined from at least two of the plurality of error signals. The noise signal is filtered in a first filter (406). The filtered noise signal is subtracted from the tracking error signal (TES) to produce a resultant error signal(TESXTC), wherein filter coefficients of the filter (406) are selected by minimizing cross-correlation between the noise signal (N) and the resultant error signal (TESXTC).

OPTICAL PICKUP AND OPTICAL INFORMATION STORAGE MEDIUM SYSTEM EMPLOYING THE OPTICAL PICKUP

An optical pickup and a recording and/or reproducing apparatus having the same, the optical pickup including: a light source emitting a light beam; an objective lens focusing the emitted light beam onto a multi-layered optical information storage medium; a polarization dependent optical path changer changing a proceeding path of the light beam; a photodetector detecting a signal beam reflected from the optical information storage medium; and a polarization element provided on an optical path of the reflected signal beam, and reducing interference between the signal beam and a noise beam reflected from an adjacent layer on a light receiving plane by changing a polarization state of the signal beam in at least a portion where the signal beam overlaps with the noise beam.

OPTICAL PICKUP DEVICE

A conventional optical pickup device compatible with a two-layer optical information recording medium has problems that the S/N of a sub frame is degraded by stray light and a signal processing circuit is complicated. Provided is an optical pickup device including: a semiconductor laser (102) for emitting a light beam (L1) of a wavelength corresponding to recording/reproduction onto/from a two-layer optical information recording medium (101); a diffraction grating (103) for diffracting the optical beam (L1) of the wavelength into a main beam of 0-th degree diffracted light and a sub frame of plus and minus primary degree diffracted light; a 1/4 wavelength plate (104) for polarizing the optical beam (L1) of the rectilinearly polarized light (p polarized light) into circularly polarized light; a polarized light hologram element (105) for diffracting the optical beam (L1) reflected from the two-layer optical information recording medium (101); a stray light removal region (111) for removing ...

OPTICAL DISC DEVICE

Light emitted from a radiation light source (1) passes through a diffraction grating (3a) and is separated into a transmitting light "a", a +1 degree diffracted light "b", and a -1 degree diffracted light "c". The transmitting light "a", the +1 degree diffracted light "b", and the -1 degree diffracted light "c" which are partially overlapped pass through an objective lens (7) and are focused on a track on a signal plane (8a) of an optical disc (8).The light reflected from the track on the signal plane (8a) passes through the objective lens (7) and comes into light branching means (13a). According to the incident position, the light corresponding to the transmitting light "a" is branched into two lights, which come into light detection regions (A1, A2), respectively. The light corresponding to the +1 degree diffracted light "b" is branched into two lights, which come into light detection regions (B1, B2), respectively. The light corresponding to the -1 degree diffracted light "c" is branched ...

OPTICAL READ DEVICE, INFORMATION PROCESSING DEVICE USING OPTICAL RECORDING MEDIUM, AND INFORMATION REPRODUCTION METHOD

An optical read device capable of surely and easily reproducing address information recorded as a wobble of guide groove in an optical recording medium. A photodetector (20) for detecting a return light from the optical recording medium has detection areas (21A to D) divided by a plurality of division lines (22, 23, 24). According to the position of the return light spot S on a light reception surface (21) of the photodetector (20), the position of the division line serving as a detection reference is modified and a difference between the light reception signals according to the detection areas divided into two by this division line is calculated to obtain push-pull signals (PP1 to 3), thereby removing the in-phase component.

Optical disk system with improved signal regulation capability

An optical disc system with improved signal regulation capabilities and a method for implementing several improvements in the capabilities are disclosed, in that the signals containing information regarding the position of an objective lens in the tracking direction can be acquired accurately and the access to optical discs can be carried out. In the method for acquiring with high precision the signals containing information on the position of the objective lens in the tracking direction, these signals are regulated in response to an access request specifying an access target region on the optical recording disc provided thereon with tracks in the shape of spiral or concentric circle, corresponding to a zone to be regulated including the access target region to be regulated out of a plurality of regulating zones formed by dividing a plurality of the tracks utilizing regulation information acquired previously. Since the signal regulation is suitably carried out corresponding to each specified ...

System and method for measuring signal deviation used in an optical recording/reproducing apparatus

A method and system for measuring the signal deviation are applied to an optical recording/reproducing apparatus. The optical recording/reproducing apparatus comprises an optical pickup head for receiving Differential Push Pull (DPP) signals reflected from an optical recording medium to trace the tracks on the surface of the optical recording medium. The DPP signal comprises a Main beam Push Pull (MPP) signal and a Sub-beam Push Pull (SPP) signal. The method firstly receives the MPP signal and the SPP signal to generate an MPP waveform and an SPP waveform separately. Then, the MPP waveform and the SPP waveform are combined to generate an amplitude waveform function. Finally, according to the amplitude waveform function, a phase difference between the MPP signal and the SPP signal is estimated. An adjusting direction can be further determined according to a relative position between the SPP waveform and the MPP waveform.

Optical head and optical disc device

The present invention aims to provide an optical head including a diffraction element capable of improving the quality of a TE signal by a DPP method even if light amounts of two sub-spots are unbalanced for optical discs having different groove pitches. In a three-beam optical head, a diffraction element 12 is divided in a radial direction of an optical disc into a first area 31, a second area 32 and a third area 33, wherein the second area 32 is further divided into a fourth area 321 and a fifth area 322. The periodic structure of the first area 31 is displaced from that of the fourth area 321 by a ¼ period, the periodic structure of the third area 32 is displaced from that of the first area 31 by a ½ period, and the periodic structure of the fifth area 322 is displaced from that of the third area 33 by a ¼ period and from that of the fourth area 321 by a ½ period.

Apparatus and method for controlling tracking servo in near field optics

Disclosed are an apparatus and a method for controlling a tracking servo in a near field optics. Gap error signals are detected in a divided state, and a push pull signal is compensated based on the detected gap error signals. A photo detector detecting the gap error signals is divided into two areas such that movement of an image formed on the photo detector can be detected. The push pull signal is compensated by subtracting a value proportional to a difference value between the two gap error signals detected in the photo detector. The difference value between the two gap error signals is proportional to a dc offset component included in the push pull signal. Accordingly, it is possible to simply remove a dc offset included in a push pull signal without largely modifying the near field optics, so that it is possible to exactly perform a tracking servo operation.

Tracking system for optical disc memory using tracking error signals from main beam and auxiliary beams

A tracking system for positioning a light spot onto a magneto optic or optical disc having a beam guide track preformatted thereon comprises a main light beam and two auxiliary light beams, and a circuit for subtracting a low frequency component of a difference between the tracking error signals, detected by the respective auxiliary light beams and the main light beam, from a tracking error signal detected by the main light beam.

Optical head device for reading information stored in a recording medium

An optical head device for reading information stored in a recording medium wherein a light beam from a light source converges onto an optical disk and a beam reflected from the optical disk is received by a light receiving element to read information stored on the optical disk. This device includes a diffraction element having first diffraction gratings for dividing the light beam from the light source into a zero order diffracted beam utilized for reading the information stored on the optical disk and a pair of first order diffracted beams utilized for reading tracking errors. The diffraction element also has second diffraction gratings for guiding the beam reflected from the optical disk to a light receiving element. The transmission factors of the zero order diffracted beam of the first and/or second diffraction gratings in the regions located in the vicinity of both ends of the diffraction element are lower than those of the first and/or second diffraction gratings in the regions located ...

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 ...

Track follower system for correcting tangent errors in an optical record scanning system

A radially acting track follower system with an optical scanner for an audio or video record disc playback apparatus is provided. The apparatus generates three light spots disposed approximately on a straight line with an adjustable phase grate. The position of the light spots can be adjusted relative to the tangent of the track scanned. The central main luminous spot provides the track scanning wit respect to the information content of the track and possibly with respect to the generation of a focussing adjustment signal. The two outer or auxiliary luminous spots provide for a radial adjustment control. They are displaced in the direction of the track at an equal distance from the main light spot in a radially opposite direction to each other by equal amounts. Their light intensity is captured by detectors, and is processed to control signals which are fed to the drive converters for each of the reflection mirror parts, which are subdivided into three part sections and which are tiltably ...

Optical recording method, optical recording apparatus and optical recording medium

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

Read-after-write optical recording device having a single radiation source and employing write modulation of such source

In an optical recording device, a record carrier (4) is scanned with an intensity-modulated write beam (13) to form an information pattern of optically detectable marks (8) on the record carrier (4). By means of a verification beam (13), which trails the write beam (14) at a fixed distance, the recorded information is read immediately after recording. The write beam (13) and the verification beam (14) are produced by the same radiation source (10) whose intensity is modulated in conformity with the information to be recorded. In order to eliminate the effect of this modulation in the read signal (Vl) obtained by means of the verification beam (14) a dividing circuit (51) divides the read signal (VI) by a signal (Vn) which is indicative of the instantaneous intensity of the radiation generated by the radiation source (10).

Optical recording apparatus with simultaneous erasing and recording

An erasing beam B1 and a recording beam B2 emitted from a laser diode array 20 are focused on different tracks of a optical magnetic disk D, the erasing beam B1 being focused on a track located ahead of a track on which the recording beam B2 is focused. The reflected beams of the erasing beam B1 and the recording beam B2 are separated respectively into two polarized components by means of a polarized beam splitter 17 and the polarized components are received by photo sensor means 23 and 24. Based on outputs of the photo sensor means 23 and 24, an address signal, a focus error signal and a tracking error signal are obtained. At the time of reproduction, the laser diode array 20 emits a reproducing beam so that the photo sensor means provide a reproducing signal.

Signal detection method and apparatus and optical recording and/or reproducing apparatus using the same

A method and apparatus for detecting a signal to determine on-track/off-track and/or a track cross direction, using a detection signal corresponding to a reflected main light beam and detection signals respectively corresponding to reflected first and second sub light beams, and an optical recording and/or reproducing apparatus using the same are provided. When detection signals respectively corresponding to one side portions, in a direction corresponding to a radial direction of the optical information storage medium, of the respective main light beam and first and second sub light beams are referred to as a first main signal, a first sub signal, and a second sub signal, respectively, the method and apparatus include obtaining a first operational signal, which is used to determine on-track/off-track and/or a track cross direction, by performing a subtraction on the combination of the first and second sub signals, and the first main signal.

Optical pickup apparatus, optical disk apparatus, and tracking error signal detection method

An optical disk apparatus of this invention includes a light source, an objective lens which focuses a laser beam output from the light source onto an optical disk, a hologram which divides an overlap region where, of reflected light components from the optical disk, a 0th-order light component and ±1st-order light components that are symmetrical with respect to the 0th-order light component overlap by the diameter of the 0th-order light component and also divides a non-overlap region where the 0th-order light component and ±1st-order light components do not overlap along the diameter and a radius perpendicular to the diameter, and a photodetector which independently detects reflected light components from the regions divided by the hologram.

Optical pickup apparatus and method

The present invention provides an improved optical pickup device based on the developing electronically reconfigurable diffraction grating MEMS technology. The improved optical pickup device has applications that include but are not limited to CD and DVD for audio, video and computer technology. The present invention can provide improvements to this current and future technology with higher data storage density and faster retrieval. In a preferred embodiment, the optical pickup apparatus comprises an electronically reconfigurable diffraction grating modulating relative light intensities as among at least two different diffraction orders of light diffracted by the electronically reconfigurable diffraction grating; focusing optics for focusing the light diffracted by the electronically reconfigurable diffraction grating into diffractive spots corresponding with each of the diffraction orders and onto an optical storage medium, which light is then reflected by the optical storage medium; and ...

OPTICAL PICKUP DEVICE

A pickup device includes a diffraction grating 12 for separating a light beam emitted from the light source into at least three light beams. The diffraction grating 12 is divided into four regions by straight lines extending in a direction parallel to a tangential direction of tracks of an optical information recording medium. A periodic structure of a second region 12B has a phase difference of approximately 180 degrees from a periodic structure of a third region 12C, and a periodic structure of a first region 12A has a phase difference of approximately 180 degrees from a periodic structure of a fourth region 12D.

Configuration of three-dimensional features in data recording structures

Improvements in the shape of three-dimensional features displayed in optical recording structures, particularly in such structures displaying features of differing dimensional characteristics. The shape improvements include reductions in berm height and width, dual level data marks and tracking guides, and land areas projecting above or into the surface of the recording structure.

Methods and apparatuses for detecting a modulation transition in an optical storage medium

Circuits, architectures, systems, methods, software, and algorithms for detecting a modulation transition (e.g., a change from a written portion containing RF-modulated data to an unwritten portion containing only a wobble signal modulation) on an optical storage medium. The method generally includes steps of focusing a first spot of light onto an optical storage medium, wherein the first spot is substantially centered on a first track of the optical storage medium, focusing a satellite spot of light onto an optical storage medium, wherein the satellite spot at least partially overlaps a track adjacent to the first track, generating a satellite signal from light reflected from the optical storage medium from the satellite spot, and detecting the modulation transition by detecting a change in a level of the satellite signal. The present invention advantageously provides for detecting a modulation transition between a main (current) track and an adjacent (next) track, so that demodulation ...

Information reproducing method

An information reproducing method for reproducing information recorded on a medium by irradiating a laser beam and detecting a reflected light beam from the medium. The method includes detecting a plurality of reflected light beams in which the polarities of variations in reflected light beam intensity distributions are substantially inverted to each other, the distribution variation being produced when a light spot of the laser beam crosses a track on the medium, adding focus error signals for the plurality of reflected light beams to generate a focus error signal, and taking a difference between tracking error signals of the plurality of reflected light beams to generate a tracking error signal.

Optical pickup unit requiring no phase adjustment

In an optical pickup unit including a diffraction grating for separating an incident beam from a laser diode into a main beam (M), first and second sub beams, the diffraction grating separates the incident beam into the first and the second sub beams (L', T') so that each of the first and the second sub beams has, on an optical disc, an elliptic spot shape which becomes longer in a radial direction of the optical disc and which spans at least two tracks (TR).

DEVICE AND METHOD FOR SCANNING AN OPTICAL RECORDING MEDIUM AND OPTICAL RECORDING MEDIUM

Optical pickup and optical data processing device using the same

Optical pickup device, optical disc apparatus and method of detecting track cross signal

A method and apparatus for detecting track and focus errors in an optical head

Compatible recording and/or reproduction apparatus

Compatible recording and=or reproduction device for optical storage media of different densities The device has a track following arrangement which uses a three-beam method. There is an optical system with its wavelength and numerical aperture matched to the maximum storage density of the media (IT1,IT2) to be used. Several auxiliary beams (E-H) matched to the track width are generated and a number of auxiliary beam detector pairs is used, corresp. to the number of different information media. The optical system contains grids for generating the different beams. The grid structures can be rotated with respect to each other.

Method for arranging optical pickup system and optical recording and/or reproducing apparatus having optical pickup system arranged using the same

Provided is a method for arranging an optical pickup system on a deck of an optical recording and/or reproducing method to enable detection of a tracking error signal using one photodetector based on a three-beam method and by a differential phase detection method. The optical pickup system includes a light source (3), a diffractive optical element (4) that diffracts a light beam incident from the light source (3) and split it into at least three beams, a plate-type beam splitter (5) that changes the propagation path of the light beam, and a photodetector (9) including at least one main photodetector (9a) having at least four sections and a plurality of sub-photodetectors (9b, 9c). The optical pickup system is also constructed so that a reflecting mirror (2) redirects the propagation path of the light beam emitted from the light source (3) toward a recording medium (1). The arrangement method includes the steps of: where a propagation path of the light beam transmitted through the plate-type ...

Tracking control apparatus for a recording/reproducing apparatus on or from an optical disk

Light emitting module and compatible optical pickup device adopting the same

A light emitting module packaging two light sources (61, 63) emitting two light beams of different wavelengths, and a compatible optical pickup device adopting the module are provided. The light emitting module includes a base (51), first and second light sources (61, 63) installed on the base (51), for emitting laser beams in different wavelength regions, a beam splitter (65) and a monitoring photodetector (67) for monitoring the optical outputs of the first and second light sources (61, 63) by receiving the beams emitted from the first and second light sources (61, 63) and split from the beam splitter (65) in one direction. Also, another light emitting module includes a substrate (111), first and second light sources (121, 131) installed on the substrate (111) for emitting laser beams of first and second wavelengths from both lateral sides thereof, a reflection member (115) for reflecting the laser beam emitted from one lateral side of each of the first and second light sources (61, 63 ...

Optical disk apparatus having an improved tracking control system

An optical disk apparatus for stable tracking and reproduction of information recorded on a high density disk, the apparatus cancels various noise components in the tracking error signal. Disturbances caused in the tracking error signal, such as crosstalk from adjacent tracks, the positional shift of the photo detectors due to a change of the ambient temperature, an inclination of the disk surface to a laser beam causing a defocus of the laser beam, and defects on a disk are eliminated. The optical disk apparatus has a light source, a diffraction grid, a semi-transparent prism, a collimator lens, an objective lens, a concave lens, a cylindrical lens, a photodetecting device, a reproduction control circuit, a tracking drive circuit, and an actuator for displacing the objective lens. ...

A recording medium for a digital optical memory, and a memory using such a medium

A recording medium (12) for a digital optical memory uses periodic clock pulses pre-recorded on each servo track (13) of an optical medium (usually disc-shaped) to provide a local self-synchronizing source of clock frequency information for read-only or direct read-after-write optical digital memories. In keeping with accepted practices, the servo track or tracks additionally function as references for controlling the positioning of a read head or a read/write head of such a memory relative to the data tracks (14).

APPARATUS COMPRISING PICKUP PROVIDING THREE BEAMS FOR READING DATA FROM OR WRITING DATA TO OPTICAL STORAGE MEDIUM, AND CORRESPONDING OPTICAL STORAGE MEDIA

PROBLEM TO BE SOLVED: To establish a system for an advanced data storage use, specifically, when a pickup unit having a blue laser diode is used. SOLUTION: The apparatus comprises the pickup unit with a laser, a detector unit and an objective lens for reading data from or writing data to a Super-RENS (super-resolution near-field structure) optical storage medium having a track pitch (TP) below the optical resolution limit, the pickup unit generates a main beam (M) for reading and/or writing of data and generates two satellite beams (S1, S2) for providing a tracking error signal, the three beams are focused by the objective lens onto the optical storage medium, and the reflected light from the optical storage medium is guided onto the detector unit. The main beam and the two satellite beams have a light intensity on the optical storage medium being sufficient for providing a super-resolution effect for the main beam as well as for each satellite beam. COPYRIGHT: (C)2009,JPO&INPIT ...

INTEGRATED OPTICAL DEVICE, OPTICAL HEAD AND OPTICAL RECORDING/REPRODUCING DEVICE

PROBLEM TO BE SOLVED: To detect tracking error signals, for example by a three-beam method by coping with two kinds of optical disks different in using laser beam wavelength and comparatively freely selecting the arrangement of the light receiving part of a photodetector. SOLUTION: The plural light receiving parts A, B, E, F of a photodetector IC 25 are disposed on the extension of a line connecting the point p1 where the main beam of the first laser beam, which is emitted from a double wavelength semiconductor laser element 24, passes through the opening 23 of a package member 21 and the point p2 where the main beam of the second laser beam from the same element 24 passes through the same opening 23, at the time when the integrated optical device 11 is projected on a plane. As a result, the arrangement of other light receiving parts C, D can comparatively freely be selected. COPYRIGHT: (C)2001,JPO ...

DISC REPRODUCING DEVICE

PURPOSE: To prevent the occurrence of an acoustic noise, by reducing the control gain of a focus controlling circuit during the time when an optical pickup means traverses plural signal tracks on a disc. CONSTITUTION: A focus error sigal SF supplied to an input terminal 18 is supplied to a coil 22 of a focus controlling linear motor through a phase compensating circuit 19, a switch circuit 20, and a variable gain amplifier 21. A search circuit 23 is added to the other input terminal of the switch circuit 20, and it is detected by a turn-on/off controlling circuit 24 whether the signal SF is within the lead-in range or not. A reproduced information signal is supplied to an input terminal 25, and the output of a low pass filter 26 in the time when a pickup means traverses many signal tracks and a DC voltage based on a DC voltage holding circuit 28 are compared in level with each other in a voltage comparing circuit 27. The gain of the variable gain amplifier 21 is lowered by the detection ...

OPTICAL PICKUP DEVICE

PROBLEM TO BE SOLVED: To suppress occurrence of optical noise by improving use efficiency of a laser beam. SOLUTION: After all laser beams from a laser chip 11 are transmitted through a polarization hologram 13, transmitted through a 1/4 wavelength plate 15 and emitted to an optical disk 17, reflected by the optical disk 17, transmitted through the 1/4 wavelength plate 15, and made incident on the polarization hologram 13. Therefore, the laser beam is transmitted through the 1/4 wavelength plate 15 two times, after its polarization direction is rotated by 90 degrees, and made incident on the polarization hologram 13. Thereby, even if the laser beam P polarization when it is transmitted through the polarization hologram 13 from the laser chip 11, when it is reflected by the optical disk 17 and transmitted through the polarization hologram 13 again, it is already made S polarization. The laser beam made to S polarization is diffracted by the polarization hologram 13 diffracting only S polarization ...

Устройство для позиционирования пучка излучения при оптическом воспроизведении информации

Изобретение относитс  к оптическому воспроизведению информации с носителей, используемых в лазерных аудио- и видеопроигрывател х, в оптических запоминающих устройствах, и позвол ет повысить надежность и точ

Optisches Informationsaufzeichnungs-/-wiedergabegerät

Gerät zur Detektion der Position eines Lichtpunktes

Gerät zur optischen Aufnahme und Wiedergabe von Information.

Optical pickup

PICK-UP HEAD FOR OPTICAL RECORDS

A pickup unit for use in an optical information record/reproduce system comprising a plurality of optical elements including a light-emitting device and an objective lens by which the light issuing from the light-emitting device is focused as a beam spot on the recording surface of a recording medium, a retaining mechanism that holds the plurality of optical elements and which is movable in a direction parallel to the recording surface, and a tilt servo mechanism for causing the optical axis of the beam spot to intersect the recording surface at right angles. The tilt servo mechanism includes a sensor for detecting the angle of inclination of the optical axis in relation to the recording surface. The sensor has a sensor stay as an integral part thereof. The sensor stay is provided as an integral part of the retaining mechanism and is movable with respect to the recording surface.

TRACK READING APPARATUS

... 1434834 Automatic control of position PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 8 May 1973 [11 May 1972] 21901/73 Heading G3R [Also in Divisions G1 and G5] An optical playback apparatus includes a device for centring the read beam 5 1a on the track 3 by forming three light spots A, B1, B2 spaced across the track, a detector 55-57 being provided for each spot. A comparison of the output from spots B 1, B2 at the track edges is used to centre the read spot A. The spots are formed from the zero and Œ1st order images of a source 50 in a diffraction grating 52, higher orders being suppressed, the grating lines being projected on to the disc record 1 at an angle to the track direction. The difference between the outputs of detectors 56, 57 (shown superimposed on the record tracks) controls the position of a pivotable mirror 59 to centre the spot A. Further control signals may be derived as shown by directing the outer beams 51b, c at an acute angle to the record 1, rather then normally as ...

OPTICAL INFORMATION RECORDING & REPRODUCING APPARATUS

DATA HANDLING, DATA SEIZURE EQUIPMENT, DATA PLAYBACK UNIT AND DATA SEIZURE/CPLAYBACK UNIT

OPTICAL SWEEP DEVICE

PROCEDURE FOR THE IMPROVED RENDITION OF A DIGITAL DATA PLATE

AUFZEICHNUNGSTRAEGER, IN DEM DATEN IN EINER OPTISCH AUSLESBAREN INFORMATIONSSTRUKTUR GESPEICHERT SINDUND VORRICHTUNG ZUM AUSLESEN DESSELBEN

OPTICAL HEAD ARRANGEMENT AND OPTICAL DISK MECHANISM

Optical pickup apparatus

Provided is an optical pickup apparatus using a reduced number of parts. An optical pickup apparatus ( 26 ) of the present invention includes: a laser unit ( 108 ) for emitting a laser beam complying with the BD standards; a laser unit ( 106 ) for emitting a laser beam complying with the DVD standards and a laser beam complying with the CD standards; and a PDIC ( 10 B) for receiving and detecting the laser beams complying with the respective standards. Because the laser beam complying with the DVD standards and the laser beam complying with the BD standards are received by one photo detector provided in the PDIC ( 10 B), the number of parts needed for the optical pickup apparatus ( 26 ) can be reduced, and the costs of the apparatus can be decreased.

Optical head device and optical disc device

An optical head device mounted in an optical disc device. The optical head device is provided with a diffractive optical element and a photodetector. The diffractive optical element has: a primary diffraction region at a location on which the positive and negative first-order components and some of the zero-order component of a reflectively diffracted light beam are incident; and secondary diffraction regions at locations on which the rest of the zero-order component but none of the positive or negative first-order components of the reflectively diffracted light beam are incident. A main light-receiving section of the photodetector receives the zero-order component of a transmissively diffracted light beam that has passed through the primary diffraction region and the secondary diffraction regions. Secondary light-receiving sections receive the positive first-order component and/or the negative first-order component of the transmissively diffracted light beam that has passed through the secondary diffraction regions.

Method for detecting obliquity of optical disc drive based on function between obliquity and central error signal bias

A method for detecting an obliquity of an optical disc drive is disclosed. The method includes the following steps: setting up and storing a function between the obliquity and a central error signal bias by performing a current level calibration upon a plurality of obliquities of the optical disc drive predetermined to be tested to obtain corresponding central error signal biases; performing the current level calibration upon an objective lens of the optical disc drive; obtaining a calibrated central error signal bias; and acquiring the obliquity of the optical disc drive by interpolating or extrapolating the calibrated central error signal bias according to the stored function between the obliquity and the central error signal bias.

Optical pickup and optical information storage medium system using the same

An optical pick-up is provided. The optical pick-up includes a light source, a first objective lens configured to focus light emitted from the light source on a high-density optical information storage medium, a photo-detector configured to detect a signal by receiving light reflected from the high-density optical information storage medium, an optical-path changer configured to convert a travel path of incident light to allow the light emitted from the light source to proceed toward the high-density optical information storage medium, and to allow the light reflected from the high-density optical information storage medium to proceed toward the photo-detector, and a blocking device disposed in an optical path of signal light reflected from a target reproducing/recording layer of the high-density optical information storage medium, passes through the first objective lens, and proceeds toward the photo-detector.

Optical disk apparatus

The amplitude deviation of a tracking error signal in an optical disk apparatus is reliably corrected by processing signals at low costs. A servo signal generator generates a tracking error signal and a lens error signal from a photodetected signal. A lens error deviation signal memory circuit stores the lens error signal generated at the servo signal generator, and reproduces the one-turn deviation of the lens error signal. A tracking error signal corrector learns an amplitude correcting value for the tracking error signal from the tracking error signal detected in reproducing the one-turn deviation of the lens error signal, and stores the amplitude correcting value in a correcting signal generator.

LENS DRIVING DEVICE, INFORMATION RECORDING AND PLAYBACK APPARATUS, AND ELECTRONIC INSTRUMENT

According to one embodiment, a lens driving device includes a movable member, a fixed member, and a magnet. The movable member is configured to retain a lens and a coil. The fixed member is configured to support the movable member such that the movable member is movable in an optical axis direction of the lens using an elastic member. The magnet is configured to generate a driving force for the movable member by interaction with the coil provided in the fixed member. At least one of the coil and the magnet is provided so as to be projected from the fixed member in a direction orthogonal to the optical axis of the lens. 1. A lens driving device comprising:a movable member configured to retain a lens and a coil;a fixed member configured to support the movable member such that the movable member is configured to move in an optical axis direction of the lens using an elastic member; anda magnet configured to generate a driving force for the movable member by interaction with the coil in the fixed member,wherein at least the coil or the magnet is projected in a direction orthogonal to an optical axis of the lens from the fixed member.2. The lens driving device of claim 1 , wherein at least the coil or the magnet is projected in the direction orthogonal to the optical axis of the lens from the fixed member through an opening formed in the elastic member.3. A lens driving device comprising:a movable member configured to retain a lens and a magnet;a fixed member configured to support the movable member such that the movable member is configured to move in an optical axis direction of the lens using an elastic member; anda coil configured to generate a driving force for the movable member by interaction with the magnet in the fixed member,wherein at least the magnet or the coil is projected in a direction orthogonal to an optical axis of the lens from the fixed member.4. The lens driving device of claim 3 , wherein at least the magnet or the coil is projected in the ...

Method for determining phase difference of tracking error signal

A method for determining phase difference of tracking error (TE) signal is disclosed. The method includes following steps. An optical disc drive is activated to generate a TE signal. Amplitudes of the master push pull (MPP) signal, the secondary push pull (SPP) signal and the TE signal are measured. The phase difference between the MPP signal and the SPP signal of the TE signal is quickly calculated according to the law of cosine.

Optical disc device and method for driving the same

Provided is an optical disc device including: an optical pickup which includes an objective lens and a receiver unit which receives light reflected off an optical disc; a signal processing unit which generates a main push-pull signal and sub push-pull signals from signals from the receiver unit, and obtains a signal obtained by subtracting the main push-pull signal from the sub push-pull signal multiplied K times, to generate a tracking-error signal; and a control unit which performs a midpoint servo process, an offset process of adding an offset value to a lens-error signal indicating displacement of the objective lens, a stabilization awaiting process of waiting for oscillation of the optical disc to stabilize, a measurement process of measuring the tracking-error signal, and a K value adjusting process of adjusting a value of K in response to a result of the measurement process.

OPTICAL RECORDING AND READING METHOD, OPTICAL RECORDING AND READING APPARATUS, OPTICAL RECORDING MEDIUM, AND METHOD FOR PRODUCING AN OPTICAL RECORDING MEDIUM

An optical recording medium includes a recording and reading layer that is previously staked or formed afterword and has no concavo-convex pattern for tracking control, and a servo layer in which a concavo-convex pattern or a groove for tracking control is formed. Information can be recorded in the recording and reading layer while tracking is performed using the servo layer. 1. An optical recording and reading method for recording information in a recording and reading layer in an optical recording medium , the optical recording medium comprising the recording and reading layer and a servo layer , the recording and reading layer being previously stacked or formed afterward and having no concavo-convex pattern for tracking control , the servo layer having a concavo-convex pattern or a groove for tracking control formed therein ,wherein information is recorded in the recording and reading layer while tracking is performed using the servo layer.2. (canceled)3. (canceled)4. (canceled)5. (canceled)6. (canceled)7. (canceled)8. (canceled)9. (canceled)10. (canceled)11. (canceled)12. The optical recording and reading method according to claim 1 ,wherein a recording and reading beam having a second wavelength shorter than a first wavelength is applied to the recording and reading layer to record or read information while a tracking beam having the first wavelength is applied to the servo layer to perform tracking control, andwherein a reflectance of the servo layer at a time when light of the recording and reading beam having the second wavelength is applied through the recording and reading layer to the servo layer is lower than a reflectance of the servo layer at a time when light of the tracking beam having the first wavelength is applied through the recording and reading layer to the servo layer.13. The optical recording and reading method according to claim 12 , wherein an amount of reflected light from the servo layer at a time when the recording and reading beam is ...

DIFFRACTIVE OPTICAL ELEMENT, PROJECTION DEVICE AND MEASURING DEVICE

To provide a diffractive optical element having a high light utilization efficiency, whereby light spots having a predetermined pattern can be stably formed, a projection device and a measuring device. 1. A diffractive optical element having a convexo-concave pattern to generate two-dimensional phase distribution , which two-dimensionally diffracts incident light into plural diffracted light rays ,which comprises a transparent substrate, a convexo-concave portion formed so as to be in contact with one surface of the transparent substrate and a filling portion with which concave portions of the convexo-concave portion are filled and which covers top surfaces of convex portions of the convexo-concave portion for planarizing the convexo-concave portion,{'b': 1', '2', '3', '1', '2', '3, 'wherein the convexo-concave portion has at least two stages on the surface of the transparent substrate; the top surfaces of the respective stages are parallel to one another; among the transparent substrate, the convexo-concave portion and the filling portion, the refractive indexes of at least the convexo-concave portion and the filling portion are different with respect to the incident light which enters from the normal direction of the surface of the transparent substrate; and all values of n, n and n are at most 2.2, wherein n, n and n are refractive indexes of the transparent substrate, the convexo-concave portion and the filling portion respectively with respect to the incident light.'}223. The diffractive optical element according to claim 1 , wherein |n−n|≥0.2.3. The diffractive optical element according to claim 1 , wherein the angle toward the diagonal direction of light spots of plural outgoing diffracted light rays when the incident light enters from the normal direction claim 1 , is at least 7.5°.4. The diffractive optical element according to claim 1 , wherein the number of formed light spots of plural outgoing diffracted light rays when the incident light enters from the ...

Optical pickup and optical information storage system including the same

Provided are an optical pickup and an optical information storage system including the same. The optical pickup includes a diffracting element that splits incident light into main light and a plurality of sub light. The diffracting element has at least three regions including first through third regions. A second region is disposed between a first region and a third region and has a phase difference from the first and third regions. The optical pickup detects a tracking error signal by using light diffracted by the diffracting element.

HYDRAULIC PUMP/MOTOR WITH ROTATION DETECTION MECHANISM

A hydraulic pump/motor includes a rotational shaft rotatably attached inside a casing, a cylinder block configured to rotate together with the rotational shaft, a plurality of pistons, a swash plate, a valve plate, and a rotation detection mechanism. The rotation detection mechanism includes a detection target section having three or more recesses formed on an outer peripheral surface of the cylinder block in a unique arrangement pattern with different arc lengths between the three continuous recesses with respect to one rotational direction of the rotational shaft and being formed so as not to include the unique arrangement pattern with respect to the other rotational direction of the rotational shaft, each of the three or more recesses having a cross section having a same semicircular shape perpendicular to a direction of the rotational shaft; and a rotation sensor arranged in the casing in a state of facing the detection target section. 1. A hydraulic pump/motor , comprising:a rotational shaft rotatably attached inside a casing;a cylinder block configured to rotate together with the rotational shaft;a plurality of pistons fittingly and reciprocatingly inserted into a plurality of cylinder bores formed on the cylinder block;a swash plate provided inside the casing so as to be tilted with respect to the rotational shaft and configured to slide a distal end portion of the plurality of pistons in a manner to achieve sliding contact;a valve plate configured to come in sliding contact with a rear end surface of the cylinder block; and a detection target section including three or more recesses formed on an outer peripheral surface of the cylinder block, the three or more recesses being formed in a unique arrangement pattern with different arc lengths between the three continuous recesses with respect to one rotational direction of the rotational shaft and being formed so as not to include the unique arrangement pattern with respect to the other rotational direction of ...

OPTICAL PICKUP AND OPTICAL RECORDING AND REPRODUCING DEVICE

An optical pickup includes a light source ; a diffraction element for generating a write main beam and a read sub-beam via diffraction; an objective lens ; a wavelength plate ; a polarization hologram element having a plurality of diffraction regions with different diffraction characteristics, designed so that each diffraction region separates a light beam reflected from the optical storage medium and transmitted through the wavelength plate into a 0order light beam and ±1order light beams; an actuator ; and a photodetector configured to detect a light beam reflected from the optical storage medium and diffracted by the polarization hologram element . The photodetector generates an RF signal from a detection result concerning a 0order light beam derived from the main beam, generates a focus error signal and a tracking error signal from a detection result concerning one of ±1order light beams derived from the main beam, and generates a signal indicating that data has been recorded normally from a detection result concerning a 0order light beam derived from the sub-beam. 1. An optical pickup for , while recording data onto a track of an optical storage medium , reading data that has been recorded on the track , comprising:a light source for emitting a light beam;a diffraction element for separating the light beam emitted from the light source into a plurality of light beams including a write main beam and a read sub-beam;an objective lens configured to converge the main beam and the sub-beam onto a same track on the optical storage medium;a wavelength plate disposed on an optical path from the diffraction element to the optical storage medium, the wavelength plate being designed so that a polarization direction of light which is incident from the diffraction element onto the wavelength plate is orthogonal to a polarization direction of light reflected from the optical storage medium and transmitted through the wavelength plate;{'sup': th', 'st, 'a polarization ...

OPTICAL WRITING / READING DEVICE WITH IMPROVED TRACKING FUNCTION

Optical disk apparatus

In an optical disk apparatus, an optical pickup includes an actuator for driving an object lens, and a sensed signal output part for making it possible to generate a tracking error signal and a lens error signal by addition/subtraction, and a signal processor includes a servo signal generator for generating a tracking error signal and a lens error signal on the basis of a signal supplied from the sensed signal output part, and a tracking offset correction quantity signal generator supplied with the lens error signal to output a tracking offset correction quantity signal. DC (direct current) offset correction is conducted by conducting addition/subtraction between the tracking error signal and both the lens error signal and the tracking offset correction quantity signal.

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

The present invention is aimed at providing a dual-layer phase-change optical recording medium which allows a high-density recording and a recording, where the optical recording medium has a high recording sensitivity even to a low power light with a short wavelength such as blue laser beam, does not cause noises such as jitter, has superior overwrite performance and favorable archivability, allows easier focusing and tracking and enables a compatibility with a ROM. Therefore, it provides an optical recording medium including a substrate and, on the substrate at least a first recording composite layer, an intermediate layer, a second recording composite layer and a cover substrate in this order, wherein the groove depth of the cover substrate is such that the magnitude of a push-pull signal of the first recording composite layer is equal or greater with respect to a push-pull signal of the second recording composite layer.

회절 소자 및 이것을 구비한 광 헤드 장치

격자부는 제 1 투명 재료를 포함하는 제 1 층과 제 2 투명 재료를 포함하는 제 2 층을 가지며 상기 투명 기판의 적어도 일방의 주면 상에 형성되고, 서로 평행하게 제 1 방향으로 연장 형성됨과 함께 그 제 1 방향과 직교하는 제 2 방향으로 주기적으로 배열된 복수의 볼록부를 갖는다. 충전부는 제 3 투명 재료를 포함하는 제 3 층에 의해, 적어도 상기 복수의 볼록부 사이를 충전한다. 상기 제 1 투명 재료의 굴절률의 온도 변화율을 α A , 상기 제 2 투명 재료의 굴절률의 온도 변화율을 α B , 상기 제 3 투명 재료의 굴절률의 온도 변화율을 α C 로 했을 때에, α A ＜α C ＜0 또한 │α C │＞│α B │ 의 관계를 만족한다. 회절 소자, 굴절률, 광 헤드 장치, 온도 변화량

디지털 데이터 저장장치를 위한 광픽업 및 서보제어시스템

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

Optical pickup device

소망의 정보신호가 기록되는 정보신호층을 복수 적층하여서 이루는 다층광디스크에 기록된 정보신호를 재생하기 위해 사용되는 광픽업장치이다. 이 광픽업장치는 광빔을 방사하는 광원과, 이 광원에서 방사된 광빔을 메인빔, 제 1사이드빔 및 제 2사이드빔으로 3분할하여 다층광디스크에 조사하는 광학수단과, 다층광디스크에서 반사된 메인빔을 수광하는 메인빔용의 수광부와, 다층광디스크에서 반사된 제 1 및 제 2사이드빔을 각각 수광하는 제 1 및 제 2사이드빔용의 수광부와, 메인빔용의 수광부, 제 1 및 제 2사이드빔용의 수광부에서 수광되는 광량에 따른 광량검출신호를 출력하는 수단과를 갖춘다. 제 1 및 제 2사이드빔용의 수광부가, 다층광디스크상의 초점이 맞춰져있지 않은 정보신호층에서 반사되는 메인빔의 반사광이 간섭하지 않는 위치에, 메인빔용의 수광부에서 소정의 간격을 두고 배치됨으로써, 다층광디스크상의 초점이 맞춰져있지 않은 정보신호층에서 반사되는 반사광의 영향을 받지 않고, 정보신호를 독해하여야 할 정보신호층에 기록된 정보신호의 정확한 재생이 행하여진다. An optical pickup apparatus is used for reproducing an information signal recorded on a multilayer optical disc formed by laminating a plurality of information signal layers on which a desired information signal is recorded. The optical pickup apparatus comprises a light source for emitting a light beam, optical means for dividing the light beam emitted from the light source into a main beam, a first side beam, and a second side beam to irradiate the multilayer optical disk, and a main reflected from the multilayer optical disk. A light receiving portion for the main beam receiving the beam, a light receiving portion for the first and second side beams receiving the first and second side beams reflected from the multilayer optical disk, respectively, a light receiving portion for the main beam, and a first and second side beam And means for outputting a light quantity detection signal according to the amount of light received by the light receiving portion. The light-receiving portions for the first and second side beams are arranged at predetermined intervals in the light-receiving portions for the main beams at positions where the reflected light of the main beams reflected from the unfocused information signal layer on the multi-layer optical disks does not interfere. Accurate reproduction of the information signal recorded in the information signal layer to be read out is performed without being affected by the reflected light reflected ...

光学的情報追跡方式

(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。

Tracking device of near-field recording and reproducing system

본 발명은 근접장 광 기록 재생 시스템의 트랙킹 장치에 관한 것으로, 광원을 발생시키는 수단과, 상기 수단에서 발생된 빛을 굴절시키며 임계각 영역에 그레이팅을 형성한 대물렌즈와, 대물렌즈로부터 반사되어 회절되는 빛을 검출하는 검출 수단으로 이루어지는 근접장 광 기록 재생 시스템의 트랙킹 장치를 제공하며, 또한 광원으로부터 빛을 발생시키고, 상기 광원으로부터 발생된 빛을 표면의 임계각 영역에 그레이팅이 형성된 대물렌즈에 입사시키고, 상기 대물렌즈의 그레이팅에 의해 반사 또는 투과되어 회절되는 빛을 광 검출 수단으로 검출하고, 상기 광 검출 수단에 의해 검출된 광량을 기준값과 비교하여 트랙킹을 수행하는 것으로 이루어지는 근접장 광 기록 재생 시스템의 트랙킹 방법을 제공한다. 본 발명에 의하면 종래의 트랙킹 방법에 의하거나 별도의 트랙킹 방법을 구성하지 않고 대물렌즈의 임계각 내부 빔 영역에 그레이팅을 형성하는 것 만으로 간단하게 트랙킹하는 것이 가능하다. 특히 근접장 광학계 등의 초고밀도 기록 및 재생 시스템에서 보다 정확하며 간단한 방법으로 트랙킹을 할 수 있다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tracking device of a near field optical recording and reproducing system, comprising: means for generating a light source, an objective lens that refracts the light generated by the means and forms a grating in a critical angle region, and light that is reflected and diffracted from the objective lens A tracking device of a near field optical recording and reproducing system, comprising a detecting means for detecting a light source, and generating light from a light source, and injecting the light generated from the light source into an objective lens having a grating formed in a critical angle region of the surface. It provides a tracking method of a near field optical recording and reproducing system, which comprises detecting light reflected or transmitted and diffracted by grating of a lens with light detecting means, and performing tracking by comparing the amount of light detected by the light detecting means with a reference value. do. According to the present invention, it is possible to simply track by forming a grating in the critical angle inner beam area of the objective lens without using a conventional tracking method or configuring a separate tracking method. In particular, tracking can be done more accurately and in a very high density recording and reproducing system such as near field optics.

光学式記録再生装置

(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。

대화식 데이터 능력을 가진 광 시스템

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

광 디바이스 및 광픽업 장치

입사광을 홀로그램 소자(19)에 의해 회절시켜서 수광 소자(12) 상의 수광 영역(20A ∼ 29)에서 수광하는 광 디바이스에 있어서, 수광 소자(12)는 광 디스크로부터 정보 판독에 사용하는 메인 빔의 반사광과, 트래킹 동작에 사용하는 서브 빔 반사광을 각각 독립된 수광 영역에서 수광하고, 메인 빔의 반사광을, 파장에 따르지 않는 공통의 수광 영역에서 수광하며, 서브 빔의 반사광을, 파장에 따라 상이한 수광 영역에서 수광함으로써, 예를 들어「DVD」 및「CD」와 같이, 사용하는 광원의 파장이 상이한 광디스크에 대해 정보 신호의 기록 및/또는 재생을 행할 때, 광디스크로부터의 불필요 반사광에 의한 영향을 받지 않음과 동시에, 신호 출력에 대한 연산의 복잡성을 회피할 수 있다. 광 디바이스, 광픽업, 홀로그램, 기록 매체, 트래킹, 광디스크, 레이저, 수광, 호환성, 불필요 반사광

Optical pick-up device

A light pickup apparatus having a laser array is disclosed. The light pickup apparatus comprises a laser beam source(30) generating a laser beam; an optical system(32, 34,36,38,42,44,46) for forming a path with the laser beam; a light-receiving element(44) for detecting a focus error by receiving a reflected beam provided from the information recording medium(d) by way of the optical system(32,34,36,38,42,44,46) and detecting a tracking error by receiving another reflected beam.

Apparatus for producing seek direction detecting signal for optical pickup

광디스크에 맺히는 광스폿중심과 디스크 트랙 센터 사이의 상대적인 위치를 판별하기 위한 광픽업용 시크 방향 검출신호 생성장치가 개시되어 있다. Disclosed is an apparatus for generating a seek direction detection signal for an optical pickup for determining a relative position between an optical spot center formed on an optical disc and a disc track center. 이 개시된 장치는 광분기수단을 통하여 메인 광과, 일정수차를 래디얼방향으로 갖는 서브 광이 광디스크에 맺히도록 한다. 메인 광은 제1광검출기에 맺히고, 서브 광은 제1광검출기에 인접된 제2광검출기에 맺힌다. 제2광검출기는 광디스크의 래디얼 방향에 대응되는 방향으로 배열되며, 한 쌍의 제1 및 제2내측수광부와, 이 제1 및 제2내측수광부 각각의 외측에 배치된 한 쌍의 제1 및 제2외측수광부를 가진다. 신호처리부는 제1광검출기에서 출력된 신호를 합산, 차동증폭하여 트랙오차신호를 검출하는 제1신호처리부와, 제1 및 제2외측수광영역과 제1 및 제2내측수광영역을 통해 검출된 신호로부터 시크방향 검출신호를 생성하는 제2신호처리부를 포함한다. The disclosed apparatus allows the main optical and the sub-light having a predetermined aberration in the radial direction to be formed on the optical disk through the optical branching means. The main light is bound to the first photodetector, and the sub light is bound to a second photodetector adjacent to the first photodetector. The second photodetector is arranged in a direction corresponding to the radial direction of the optical disc, and includes a pair of first and second inner light receiving portions and a pair of first and second rays disposed outside each of the first and second inner light receiving portions. It has two external light-receiving parts. The signal processor detects the track error signal by summing and differentially amplifying the signals output from the first photodetector, and detected through the first and second outer light receiving regions and the first and second inner light receiving regions. And a second signal processor for generating a seek direction detection signal from the signal.

Optical storage device using near-field optical phenomenon and tracking control method using the same

근접장 광학현상을 이용한 광 저장장치 및 이를 이용한 트랙킹 제어방법은 기록매질에 정보가 기록된 데이터 마크의 배열방향 즉, 트랙을 따라가며 트랙킹을 할 수 있도록하여 정확한 데이터의 재생이 이루어지도록 하기 위한 것으로서, 상기 기록매질에 기록된 정보를 읽기 위해 기록매질상에 분포된 광량을 탐침하는 제 1 탐침수단; 상기 기록매질의 트랙방향과 상기 제 1 탐침수단에 의해 기록매질에 기록된 정보를 스캔하는 방향이 일치하는가를 판단하기 위해 상기 기록매질상에 분포된 광량을 탐침하는 복수개의 제 2 탐침수단; 제공되는 트랙킹 제어신호에 따라 상기 제 1, 2 탐침수단의 트랙킹 방향을 조정하는 탐침조정수단; 상기 제 1 탐침수단에서 탐침된 광량을 검지하여 기 설정된 기록매질에 기록된 정보에 해당하는 정보신호를 발생하는 기록정보 발생수단; 상기 복수개의 제 2 탐침수단에서 탐침한 광량을 각각 검지하여 상기 검지된 광량에 해당하는 트랙킹신호를 각각 발생하는 광검지수단; 상기 광 검지수단에서 발생한 트랙킹 신호에 따라 트랙킹제어신호를 발생하여 상기 조정수단으로 제공하는 제어수단을 포함하여 구성됨에 그 요지가 있다.

Optical information recording / reproducing device

Device for producing search direction detection signal by optical reading

公开了产生用于光拾取器装置的查找方向检测信号的装置，用于确定聚焦在光盘光点中心与光盘轨迹中心的相对位置。通过分配器聚焦主光束和副光束。主光束聚焦在第一检测器，副光束聚焦在第二检测器。第二检测器有设在光盘径向方向的第一、二内接收器，和设在第一、二内接收器外的第一、二外接收器。信号处理器包括：第一信号处理器，求和/差分从第一检测器输出的信号并检测轨迹误差；第二信号处理器，从第一和第二外接收器及第一、二内接收器检测的信号产生查找方向检测信号。

Photodetectors for the Use of Two-Wave Laser Diodes

2파장 레이저 다이오드의 사용을 위한 광검출기가 개시된다. 본 발명에 의하면, DVD용 레이저 빔 및 CD용 레이저 빔을 각각 검출하기 위해 10분할된 포토 다이오드를 구비함으로써, 광픽업은 2파장 레이저 다이오드를 용이하게 적용할 수 있다. Photodetectors for the use of two wavelength laser diodes are disclosed. According to the present invention, by providing a photodiode divided into ten for detecting the laser beam for DVD and the laser beam for CD, respectively, the optical pickup can easily apply a two-wavelength laser diode. 포토 다이오드, 2파장 LD, 광픽업 Photodiodes, 2-wavelength LD, Optical Pickup

Optical pickup drive

Optical device and optical pickup device

입사광을 홀로그램 소자(19)에 의해 회적시켜서 수광 소자(12) 상의 수광 영역(20A ∼ 29)에서 수광하는 광 디바이스에 있어서, 수광 소자(12)는 광 디스크로부터 정보 판독에 사용하는 메인 빔의 반사광과, 트래킹 동작에 사용하는 서브 빔 반사광을 각각 독립된 수광 영역에서 수광하고, 메인 빔의 반사광을, 파장에 따르지 않는 공통의 수광 영역에서 수광하며, 서브 빔의 반사광을, 파장에 따라 상이한 수광 영역에서 수광함으로써, 예를 들어「DVD」 및「CD」와 같이, 사용하는 광원의 파장이 상이한 광디스크에 대해 정보 신호의 기록 및/또는 재생을 행할 때, 광디스크로부터의 불필요 반사광에 의한 영향을 받지 않음과 동시에, 신호 출력에 대한 연산의 복잡성을 회피할 수 있다. 광 디바이스, 광픽업, 홀로그램, 기록 매체, 트래킹, 광디스크, 레이저, 수광, 호환성, 불필요 반사광

Optical information recording / reproducing method and apparatus

Optical disc discriminating device

PURPOSE: A device for discriminating an optical disc is provided to discriminate a kind of an optical disc mounted to a deck by a phase difference of 180° between sub-beam signals, thereby reducing a lead-in time and prevent the system error due to the mis-judgement of the optical disc. CONSTITUTION: A device for discriminating an optical disc includes an optical pickup(10) for generating data recorded to an optical disc to output sub-beam signals(E,F), an EF signal amplifying part(11) for amplifying the sub-beam signals to a predetermined level, removing noise, and low pass filtering to output a predetermined voltage, a first comparing part(12) for comparing the voltage of one of the sub-beam signals with a reference voltage to output a high or low level signal according to the comparison result, a second comparing part(13) for comparing the other sub-beam signal with a reference voltage to output a high or low level signal according to the comparison result, a gate circuit part(14) for outputting a low level signal when the signals output from the first and second comparing parts equal while outputting a high level signal in the other case, a control part(15) for discriminating a kind of the optical disc according to the signal output from the gate circuit part, and a servo-part(16) for controlling the driving of the pickup according to a control signal of the control part.

Optical head device and optical disk device

A scanning device and an optical reading and recording device having the device

주사 장치는 제1방사 비임(3)과 제2방사 비임(2)에 의한 형태를 형성하여 기록 캐이어(9)의 기록 표면을 반복해서 주사하는 광학 주사계(1,5,6,7)를 갖는다. 상기 제1방사 비임(3)과 제2 방사 비임(2)은 기록 캐이어(9)의 기록표면에 제1주사스폿(11)과 제2주사스폿(12)을 형성한다. 주사스폿(11,12)은 다른 소정의 주사방향을 갖는 제1주사 경로(16)와 제2주사 경로(18)에 따른 동기적 이송을 수행하며, 이의 결과로서, 상기 주사 경로(16 및 19)에 가로지르는 y방향에서 관측할 때 상기 제1주사스폿(11)과 상기 제2주사스폿(12) 사이의 간격은 주사하는 동안에 변화한다. 주사장치는 광학 기록 및 판독 장치에 이용될 수 있다. 기록 및 판독 장치는 트랙에 가로지르는 y방향에서 상기 기록 캐리어 테이프(9)를이송시키는 이송롤러(14)를 더 포함한다. 검출계(70)는 상기 제2주사 스폿(12)으로 나오는 방사를 대응하는 검출 신호(S1)로 변환한다. 측정 회로(72)는 상기 제1주사 경로(16)상에서 상기 제1주사 스폿(11)의 위치를 나타내는 검출 신호(S1)와 기준 신호(S3) 사이의 편차를 근거로 위치 측정 신호(Sp)를 유도한다. 상기 검출신호는 상기 주사 경로(16)에 가로지르는 y방향에서 주사 스폿의 속도를 나타내는 속도 측정 신호(Sv)를 유도하고, 상기 주사 스폿(12)에 의해 가로지르는 트랙(75)의 위치에서 정보 패턴을 성분을 나타내는 성분 측정신호를(Sa)를 유도하는데 사용될 수 있다. 판독하는 동안에 상기 제2주사 스폿(12)과 제3주사 스폿(13)을 상기 제1주사 스폿(11)에 대해 항상 대칭적으로 배치시키는 방법으로 제3주사 스폿(4)이 제3주사 스폿(13)을 생성하면, 대응하는 검출신호(S1,S2)는 경사 측정 신호(Ss)를 유도하는데 사용될 수 있다. 이 경사 측정 신호는 기록 표면과 주사 경로(16)상에서 트랙(75)사이의 각을 나타낸다.

Optical pickup and optical disc apparatus

Detecting device for tracking error of optical head

(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 apparatus, optical disc apparatus, and track recognition signal detection method

주 스폿과 보조 스폿은 광 디스크(101) 상에 형성된다. 주 스폿은 기록 및 재생을 위해 이용된다. 보조 스폿은 주 스폿으로부터 떨어져서 위치된다. 보조 스폿은 대물 렌즈로부터의 거리에 있어 주 스폿과 상이하다. 거리(초점 분산량) Def는 0.4×Def0 ≤Def ≤1.7×Def0의 범위를 만족한다. 이 때, 광원 파장은 λ이고 광 디스크의 트랙 피치는 Tp이고 대물 렌즈의 개구수는 NA이고 Def0 = [0.178λ/{1-cos(sin -1 NA)}]ㆍ[{1-(λ/(TpㆍNA))}+2.35]라고 가정된다. The main spot and the auxiliary spot are formed on the optical disc 101. The main spot is used for recording and playback. The secondary spot is located away from the main spot. The auxiliary spot is different from the main spot in distance from the objective lens. The distance (focal dispersion amount) Def satisfies the range of 0.4xDef0≤Def≤1.7xDef0. At this time, the light source wavelength is λ, the track pitch of the optical disk is Tp, the numerical aperture of the objective lens is NA, Def0 = [0.178λ / {1-cos (sin- 1 NA)}] · {{1- (λ / (Tp • NA))} + 2.35]. 광 픽업 장치, 광 디스크 장치, 트랙 인식 신호 검출 방법, 광 비임, 광 기록 매체 Optical pickup apparatus, optical disk apparatus, track recognition signal detection method, optical beam, optical recording medium

Optical pick-up apparatus for multi recoding/reproducing

멀티 기록/재생용 광픽업장치가 개시된다. 본 발명에 따른 멀티 광픽업장치는 CD용 광원 및 DVD용 광원을 구비한 광원모듈과, 광원모듈로부터 출사되는 소정의 광을 적어도 3개의 광으로 분할하는 회절격자와, 회절격자에 의해 분할된 적어도 3개의 광이 광디스크에 입사되도록 광 경로를 변환시키는 제1광분할기와, 광디스크에서 반사되어 제1광분할기를 통해 입사되는 적어도 3개의 광을 소정 비율로 반사 및 투과시키는 제2광분할기와 제2광분할기에서 반사되는 적어도 3개의 광 중 어느 하나의 광을 수광하기 위하여 하나의 광검출센서를 구비한 제1광검출기 및 제2광분할기에서 투과되어 입사되는 적어도 3개의 광을 수광하기 위하여 적어도 3개의 광검출센서를 구비한 제2광검출기를 구비한다. 본 발명에 따르면, 간단한 광학적 구조로 서로 다른 규격의 광디스크를 호환 채용할 수 있다. Disclosed is an optical pickup apparatus for multi-recording / reproducing. The multi-optical pickup apparatus according to the present invention includes a light source module having a light source for CD and a light source for DVD, a diffraction grating for dividing predetermined light emitted from the light source module into at least three lights, and at least divided by a diffraction grating. A first light splitter that converts an optical path so that three light is incident on the optical disk, a second light splitter that reflects and transmits at least three light reflected by the optical disk and incident through the first light splitter at a predetermined ratio, and a second light splitter At least 3 for receiving at least three light transmitted through and incident from the first and second light splitters having one light detecting sensor to receive any one of at least three light reflected by the splitter. And a second photodetector having two photodetection sensors. According to the present invention, optical discs of different standards can be used interchangeably with a simple optical structure. 광픽업, 광디스크, 호환, 광검출기 Optical Pickup, Optical Disc, Compatible, Photodetectors

Apparatus for producing seek direction detecting signal for optical pickup

랜드/그루브 구조의 광디스크의 동일 트랙 상에 메인 광과 래디얼 방향 또는 탄젠셜 방향으로 일정 수차를 갖는 서브 광을 조사하여 이로부터 광디스크에 조사되는 광스폿의 시크 방향 및 광스폿 중심과 광디스크의 트랙 센터 사이의 상대적인 위치를 검출할 수 있도록 된 광픽업용 시크 방향 검출신호 생성장치가 개시되어 있다. Irradiation of sub-lights having a certain aberration in the radial direction or the tangential direction with the main light on the same track of the optical disc of the land / groove structure, from which the seek direction and optical center of the optical spot irradiated to the optical disc and the track center of the optical disc An apparatus for generating a seek direction detection signal for an optical pickup capable of detecting a relative position therebetween is disclosed. 이 광픽업용 시크 방향 검출신호 생성장치는, 광디스크에서 반사된 메인 광과 서브 광은 각각 광디스크의 탄젠셜 방향에 대응되는 방향 및/또는 래디얼 방향에 대응되는 방향으로 서로 인접되게 배치된 제1 내지 제6수광부를 구비하는 메인 광검출기 및 서브 광검출기에 수광되어, 각 수광부에서 각각 독립적으로 광전변환되며, 메인 광검출기의 제1 내지 제6수광부 중 적어도 일부 수광부에서 출력된 신호로부터 검출된 트랙 오차신호와, 메인 및 서브 광검출기 각각의 탄젠셜 방향에 대응되는 방향 및/또는 래디얼 방향에 대응되는 방향으로 서로 인접하지 않는 제1, 제3 및 제5수광부에서 출력된 신호의 합과 제2, 제4 및 제6수광부에서 출력된 신호의 합을 차동하여 검출한 제1 및 제2차동신호를 서로 차동하여 검출된 트랙 크로스신호를 비교하도록 되어 있다. The optical pickup seek direction detection signal generating apparatus includes a first to sub-optical light reflected from an optical disc, the first to sub-optical lights being disposed adjacent to each other in a direction corresponding to a tangential direction and / or a radial direction of the optical disc, respectively. A track error detected by a main photodetector having a sixth light receiver and a sub photodetector, respectively independently photoelectrically converted at each light receiver, and detected by a signal output from at least some of the first to six light receivers of the main photodetector The sum of the signals and the signals output from the first, third and fifth light receiving units which are not adjacent to each other in a direction corresponding to the tangential direction and / or a radial direction of each of the main and sub photodetectors, respectively; The first and ...

Optical pickup device, optical recording and/or reproducing apparatus using the same, and method for detecting tracking error signal

提供一种光学拾取器和一种采用该光学拾取器的光学记录和/或再现设备，其中，该光学拾取器包括：光源；物镜，用于聚集入射光束，并且将所述入射光束聚焦在信息存储介质上；全息光栅，用于通过衍射将由光源发射的光分为主光束以及第一和第二副光束，并且在所述第一和第二副光束中提供或产生连续变化的波前，以减小所述第一和第二副光束的副推挽(SPP)信号的交流(AC)分量的振幅；和光电检测器，用于接收聚焦在信息存储介质上并从信息存储介质反射的所述主光束以及第一和第二副光束，以获得所述主光束的主推挽(MPP)信号以及所述第一和第二副光束的SPP信号。

Optical head

光盘由于在其半径方向倾斜时发生的彗形象差的影响引起跟踪信号产生相位偏移，使跟踪控制的精度减低。在光学头中设置：集光于光盘的物镜(4)、收受从光盘反射的反射光束、获得受光信号的受光装置(8)、从受光信号中检测跟踪误差信号的跟踪误差信号检测装置(9)、以及使入射到受光装置(8)的反射光束中、用于检测跟踪误差信号的跟踪误差信号检测用光束的中央部的领域的光量衰减的光学装置(6)。

Disk area detection method and apparatus thereof

본 발명에 따라 디스크 영역 검출 방법 및 디스크 영역 검출 장치가 개시된다. Disc disk detection method and disk area detection apparatus are disclosed in accordance with the present invention. 본 발명에 따른 디스크 영역 검출 방법은, 사이드푸시풀(SPP) 1 신호와 사이드푸시풀(SPP) 2 신호의 차를 검출하는 단계와, 상기 차의 크기에 기초하여 디스크에 마련된 저장매체 관련 정보 영역인지 사용자 데이터 영역인지를 결정하는 단계를 포함한다. 이상과 같은 본 발명에 의하면, 디스크의 사용자 데이터 영역과 저장매체 관련 정보 영역은 간단하게 구별함으로써 적절한 PLL 제어를 할 수 있게 된다. The disk area detection method according to the present invention includes detecting a difference between a side push-pull (SPP) 1 signal and a side push-pull (SPP) 2 signal, and a storage medium-related information area provided on the disk based on the size of the difference. Determining whether it is a user data area. According to the present invention as described above, it is possible to perform appropriate PLL control by simply distinguishing the user data area of the disk from the storage medium related information area.

Optical playback device

Pick-up device for beam

본 발명은, 광픽업장치에 관한 것으로서, 광픽업장치에서 디스크에 반사된 빔을 검출하는 광검출기는, 광디스크에 의해 반사된 하나의 메인 빔과 두 개의 서브 빔을 투과시키는 기질과, 기질을 투과한 두 개의 서브 빔을 상기 광원에서 출력된 파장에 따라 상이한 굴절률로 굴절시키는 액정과, 액정에 전원을 공급하는 전극재료, 전극재료로 공급되는 전원의 전압세기를 조절하는 스위치와, 메인 빔 및 기질과 액정을 통과하면서 굴절된 서브 빔이 투사되어 전기신호로 변환되는 수광소자를 구비하고 있다. 이러한 광검출기는 포토다이오드의 전방에 기질과 액정을 설치하고, 액정에 인가되는 전압의 크기를 조절함으로써, 수광배율을 변경할 수 있도록 하고 있다. 따라서, 디스크로부터 반사된 서브 빔을 파장에 따라 적정한 굴절률로 굴절시킴으로써, ±1차광이 파장에 상관없이 동일한 위치에 투사되도록 할 수 있고, 이에 따라, 다양한 규격을 갖는 디스크에 정보를 재생 및 기록할 수 있게 된다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup apparatus, wherein an optical detector for detecting a beam reflected by a disk in an optical pickup apparatus includes a substrate for transmitting one main beam and two sub beams reflected by the optical disk, and a substrate for transmitting the substrate. A liquid crystal for refracting one or two sub-beams at different refractive indices according to the wavelength output from the light source, an electrode material for supplying power to the liquid crystal, a switch for adjusting the voltage intensity of the power supplied to the electrode material, a main beam and a substrate And a light-receiving element which projects the refracted sub-beams while passing through the liquid crystal and converts them into electrical signals. Such photodetectors provide a substrate and a liquid crystal in front of the photodiode, and adjust the magnitude of the voltage applied to the liquid crystal so that the light reception magnification can be changed. Therefore, by refracting the sub-beams reflected from the disc at an appropriate refractive index according to the wavelength, ± 1st order light can be projected at the same position irrespective of the wavelength, thereby reproducing and recording information on a disc having various standards. It becomes possible. 광픽업장치, 광검출기, 기질, 액정, ITO, 포토다이오드, 서브 빔, ±1차광 Optical pickup device, photodetector, substrate, liquid crystal, ITO, photodiode, sub ...

Optical pickup device and optical disc device

An optical pickup device imparts different astigmatisms from each other to light fluxes in four light flux areas formed around an optical axis of laser light, out of the laser light reflected on a disc. The optical pickup device also changes the propagating directions of the light fluxes in the light flux areas to separate the light fluxes in the light flux areas each other. A signal light area where only signal light exists is defined on a detection surface of a photodetector. Eight sensing portions are arranged at a position corresponding to the signal light area. According to this arrangement, only the signal light is received by the sensing portions to thereby suppress deterioration of a detection signal resulting from stray light. Further, a push-pull signal, whose DC component is suppressed, is obtained by computing an output from the eight sensing portions by a predetermined formula.

Optical head device and optical disk device

An optical head device mounted in an optical disc device. The optical head device is provided with a diffractive optical element and a photodetector. The diffractive optical element has: a primary diffraction region at a location on which the positive and negative first-order components and some of the zero-order component of a reflectively diffracted light beam are incident; and secondary diffraction regions at locations on which the rest of the zero-order component but none of the positive or negative first-order components of the reflectively diffracted light beam are incident. A main light-receiving section of the photodetector receives the zero-order component of a transmissively diffracted light beam that has passed through the primary diffraction region and the secondary diffraction regions. Secondary light-receiving sections receive the positive first-order component and/or the negative first-order component of the transmissively diffracted light beam that has passed through the secondary diffraction regions.

Optical pickup device

In a photo pickup device, an incident area 30 for a reflection light of a light spot is divided into four areas 30 a˜ 30 d by parting lines 31, 32 making axial-symmetrical angles with a direction Y of a projected track on an optical disc. In these areas, the so-divided areas 30 a, 30 c are formed so as to diffract the light in one or more directions in a range of 90 degrees ±20 degrees to the direction Y and impress misalignment on each diffraction light. In each diffraction light, two focal lines produced due to the astigmatism make approx. 45 degrees with the direction Y of the projected track. Further, the divided areas 30 b, 30 d are characterized by diffracting the light in one or more directions in a range of 90 degrees ±20 degrees to the direction Y.

Optical pickup device

First order diffraction lights reflected on a first signal face for reproducing an optical disc and further deflected by a spatial divide element converge to spots 21 a to 21 d on photo acceptance cells 9 A to 9 D of a photodetector 9 , while diffraction lights reflected on the first signal face and further diffracted by other orders of diffraction except plus first-order and diffraction lights reflected on a second signal face become crosstalk lights. Therefore, an optical pickup device is adapted so that minus (−) first-order diffraction lights 23 a to 23 d from the first signal face and the spots 21 a to 21 d of the first order diffraction light from the second signal face are not radiated on the photo acceptance cells 9 A to 9 D.

Optical pickup device and optical disk device

Optical pickup device and optical disc device

An optical pickup device imparts different astigmatisms from each other to light fluxes in four light flux areas formed around an optical axis of laser light, out of the laser light reflected on a disc. The optical pickup device also changes the propagating directions of the light fluxes in the light flux areas to separate the light fluxes in the light flux areas each other. A signal light area where only signal light exists is defined on a detection surface of a photodetector. Eight sensing portions are arranged at a position corresponding to the signal light area. According to this arrangement, only the signal light is received by the sensing portions to thereby suppress deterioration of a detection signal resulting from stray light. Further, a push-pull signal, whose DC component is suppressed, is obtained by computing an output from the eight sensing portions by a predetermined formula.

Optical pickup

본 발명은 광픽업 장치(Optical Pickup System)에 관한 것이다. 종래에는 광학계 자체가 많은 부피를 차지하고, 또한 이들이 배치가 공간적으로 이루어지며, 반도체 레이저(3)와 포토디턱터(7)가 분리되어, 장치의 크기가 커지고 무게 또한 무거워져 광디스크(1)상에 기록된 정보를 읽는데 필요한 시간이 느려지는 주된 원인이 되고, 또한 광부품들이 독자적으로 고정되어야 하므로 조립 시간이오래 걸리고 조립성이 나쁘므로 제조원가의 상승요인이 되는 문제점이 있었다. 본 발명은 광원으로 사용되는 반도체 레이저(4)와, 반도체 레이저(4)로부터 발생하는 발산광(9)을 광디스크(1)상에 집속시키는 대물랜즈(2)와, 광디스크(1)에 의해 반사되어 대물렌즈(2)를 통과한 후, 집속되는 레이저 빔을 4분할 포토디텍터(5)에 집속시키는 4분할 홀로그램(3)과, 홀로그램(3)(H1,H2, H3, H4)에 의해 회절, 접속되는 레이저 빔을 검지하는 4분할 포토 디텍터(5)(P1,P2,P3,P4)의 순으로 레이저 빔의 진행광로를 구성하여, 홀로그램(3)을 사용하여 기존의 광픽업 기능을 가능하게 하고, 또한 반도체 레이저(4)와 포토디텍터(5)를 하나의 모듈로 구성할 수 있어 광픽업을 소형 및 경량화 시킬수 있기 때문에 픽업을 사용하는 기기에서 정보의 읽는 속도를 증가시킬수 있으며, 조립을 용이하게 하도록 한 것이다.

Tracking servo circuit

광학식 디스크장치 등을 위한 트래킹서보회로에 있어서, 서보오프의 상태에서 얻어지는 트래킹에러신호 TE를 A/D변환하여 그 센터레벨을 센터레벨연산회로에서 산출하고, 그 값을 레지스터에 격납하여 두고, 서보온일 때에 스위치를 하나의 단자 a측에 접속하고, 정상동작시는, 서보온상태시에 얻어지는 트래킹에러신호 TE로부터 감산회로에서 레지스터에 격납된 센터레벨을 감산하여 트래킹에러신호의 오프셋보정을 행하고, 돌발적 원인으로 디스크면으로부터의 반사광이 얻어지지 않게 되면, RF신호에 따라서 생성되는 신호 FOK가 로레벨에 전환한 것에 응답하여 다른 스위치의 접속을 단자 b에 전환하여, 트래킹에러신호 TE의 오프셋보정동작을 정지한다. In a tracking servo circuit for an optical disk device or the like, a tracking error signal TE obtained in the servo-off state is subjected to A / D conversion, the center level is calculated by the center level calculation circuit, the value is stored in a register The switch is connected to one terminal a side at the time of keeping the temperature, and in normal operation, the subtraction circuit subtracts the center level stored in the register from the tracking error signal TE obtained in the servo-on state to perform offset correction of the tracking error signal In response to the fact that the signal FOK generated in accordance with the RF signal is switched to the low level when the reflected light from the disk surface can not be obtained due to the sudden cause, the connection of the other switch is switched to the terminal b, Stop operation.

Optical pickup and optical information storage medium system

광픽업 및 이를 적용한 광정보저장매체 시스템이 개시된다. 광픽업은, 고밀도 광정보저장매체 상에 광원으로부터 출사되는 광을 집속시키는 제1대물렌즈, 광정보저장매체로부터 반사되는 광을 수광하여 신호를 검출하는 광검출기, 차단소자를 구비한다. 차단소자는, 고밀도 광정보저장매체의 재생/기록 대상층에서 반사되고 제1대물렌즈를 통과하여 광검출기로 진행하는 신호광의 광로 상에, 고밀도 광정보저장매체가 복수의 기록층을 가질 때, 상기 재생/기록 대상층 이외 층에서 반사된 층간 간섭광을 차단하도록, 신호광 통과 영역 주변에 층간 간섭광을 차단하는 차단 영역이 형성된다. An optical pickup and an optical information storage medium system using the same are provided. The optical pickup includes a first objective lens that focuses light emitted from a light source on a high density optical information storage medium, a photodetector that receives light reflected from the optical information storage medium, and detects a signal. When the high density optical information storage medium has a plurality of recording layers on the optical path of the signal light reflected from the reproduction / recording target layer of the high density optical information storage medium and passing through the first objective lens and proceeding to the photodetector, In order to block interlayer interference light reflected from layers other than the reproduction / recording target layer, a blocking region for blocking interlayer interference light is formed around the signal light passing area.

Optical information recording / reproducing device

Optical disk device

본 발명은, 간단한 구성으로 광축의 어긋남의 원인인 오프셋을 저감할 수 있어, ATIP의 판독 정밀도를 향상시킬 수 있는 광 디스크장치를 제공하는 것을 목적으로 한다. 리드파워시 또는 소거파워시의 메인 광빔의 반사광의 검출신호로부터 제1트랙킹 에러성분을 생성하는 제1트랙킹 에러 생성수단(18, 70)과, 라이트파워시의 서브 광빔의 반사광의 검출신호로부터 제2트랙킹 에러성분을 생성하는 제2트랙킹 에러 생성수단(22∼26, 72, 74)과, 제1트랙킹 에러성분으로부터 제2트랙킹 에러성분을 감산하여 기록시의 트랙킹 에러신호를 얻는 감산수단(20)을 갖는 것에 의해, 간단한 구성으로 메인 광빔의 기록시의 리드파워시 또는 소거파워시에 대한 라이트파워시의 광축의 어긋남 등의 원인의 오프셋을 저감할 수 있어, 기록시의 리드파워의 타이밍으로 메인 광빔의 반사광으로부터 검출되는 ATIP의 판독 정밀도를 향상시킬 수 있다. SUMMARY OF THE INVENTION An object of the present invention is to provide an optical disk apparatus which can reduce the offset which is the cause of misalignment of the optical axis with a simple configuration and can improve the reading accuracy of ATIP. First tracking error generating means (18, 70) for generating a first tracking error component from the detection signal of the reflected light of the main light beam during read power or erase power; and the detection signal of the reflected light of the sub light beam during light power. Second tracking error generating means (22 to 26, 72, 74) for generating two tracking error components and subtraction means (20) for subtracting the second tracking error component from the first tracking error component to obtain a tracking error signal at the time of recording By a simple structure, the offset of the cause such as the deviation of the optical axis at the time of the read power at the time of recording the main light beam or at the time of the erase power at the time of erasing power can be reduced, and the timing of the read power at the time of recording can be reduced. The reading accuracy of the ATIP detected from the reflected light of the main light beam can be improved.

Grating element, optical pickup optical system, and grating element design method

透明基板１２Ｄ、１２Ｅ、１２Ｆの一方の表面に凸部１２Ｇ、１２Ｉ、１２Ｋと凹部１２Ｈ、１２Ｊ、１２Ｌとが周期的に配置されてなる回折部材１２Ａ、１２Ｂ、１２Ｃを備え、回折部材１２Ａ、１２Ｂ、１２Ｃは、透明基板１２Ｄ、１２Ｅ、１２Ｆに略垂直な方向に積層されており、回折部材１２Ａ、１２Ｂの凸部１２Ｇ、１２Ｉは、誘電体多層膜により形成され、誘電体多層膜は、透明基板１２Ｄ、１２Ｅ上に２種類以上の誘電膜が当該略垂直な方向に積層されてなり、回折部材１２Ａ、１２Ｂ、１２Ｃが所定の回折効率で回折させるレーザ光の波長はそれぞれ異なるように構成した。 The diffractive members 12A, 12B, 12B are provided with diffractive members 12A, 12B, 12C in which convex portions 12G, 12I, 12K and concave portions 12H, 12J, 12L are periodically arranged on one surface of the transparent substrates 12D, 12E, 12F. , 12C are laminated in a direction substantially perpendicular to the transparent substrates 12D, 12E, and 12F, and the convex portions 12G and 12I of the diffraction members 12A and 12B are formed of a dielectric multilayer film, and the dielectric multilayer film is transparent. Two or more types of dielectric films are stacked on the substrates 12D and 12E in the substantially vertical direction, and the diffraction beams 12A, 12B, and 12C are configured to have different wavelengths of laser light that are diffracted with a predetermined diffraction efficiency. .

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。

Intergrated optical unit, optical head and optical recording and/or reproducing apparatus

본 발명은 파장이 다른 두 레이저 빔들을 사용하여 두 종류의 광 디스크들에/로부터 정보를 기록 및/또는 판독하는 것을 가능하게 함으로써 3 빔법(three-beam method)에 의한 트래킹 에러 신호의 검출을 가능하게 하는 집적 광학 유닛, 광학 헤드 및 광 기록 및/또는 재생 장치를 제공한다. 집적 광학 유닛의 평면에 위치하는 복수의 광 검파기들을 사용하여 광 디스크들로부터 반사된 레이저 빔들의 복귀 성분들을 검출함으로서 에러 신호가 발생된다. 1차 복귀 성분들을 검출하는 광 검파기들은 2-파장 반도체 레이저로부터 출사되는 제 1 레이저의 주 광선 (main ray)이 통과하는 패키지의 개구부 내부에 있는 지점과 제 2 레이저의 주 광선이 통과하는 개구부 내부에 있는 지점을 연결하는 선의 연장선상에 배치된다. The present invention enables the detection of tracking error signals by the three-beam method by making it possible to record and / or read information from / to two types of optical disks using two laser beams of different wavelengths. To provide an integrated optical unit, an optical head and an optical recording and / or reproducing apparatus. An error signal is generated by detecting the return components of the laser beams reflected from the optical disks using a plurality of optical detectors located in the plane of the integrated optical unit. Optical detectors for detecting the first return components are located inside the opening of the package through which the main ray of the first laser exiting the two-wavelength semiconductor laser passes and inside the opening through which the main ray of the second laser passes. It is placed on the extension of the line connecting the points at. 광 기록 재생 장치, 광학 헤드, 집적 광학 유닛, 발광기, 광 검파기 Optical recorder, optical head, integrated optical unit, light emitter, optical detector

Optical pickup and manufacturing method thereof

Compatible optical scanning device

Использование: в технике оптической записи информации, в частности, для сканирования первого и второго типов оптического носителя записи. Сущность изобретения: в устройстве источник излучения образует луч излучения первой длины волны. Образуемое этим лучом излучение в виде сканирующего или считывающего пятна точно следует по центральной линии предназначенной для считывания дорожки на носителе записи первого типа, предназначенного именно для этой длины волны. В случае считывания второго типа носителя записи, считывающее пятно в соответствии с изобретением будет точно следовать по кромке, предназначенной для считывания дорожки, а не по центральной линии. Благодаря этому удовлетворительный информационный сигнал образуется при сканировании носителей записи как первого, так и второго типов. 9 з.п. ф-лы, 11 ил. 95$58960с ПЧ Го РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (19) (51) МП ВИ” 2 096 836. 13) СЛ ° ©Сл1в 7/09 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 5052441/28, 31.07.1992 (30) Приоритет: 01.08.1991 ЕР 91201991.6 (46) Дата публикации: 20.11.1997 (56) Ссылки: Патент Японии М 2-83830, кл.С 11В 711125, 1990. (71) Заявитель: Филипс электроникс Н.В. (МЕ) (72) Изобретатель: Адрианюс Петрус Йоханнес Мария Ионгенелис МЕ |, Герард Эдуард Ван Росмален[МЕ] (73) Патентообладатель: Филипс электроникс Н.В. (МЕ) (54) СОВМЕСТИМОЕ ОПТИЧЕСКОЕ СКАНИРУЮЩЕЕ УСТРОЙСТВО (57) Реферат: Использование: в технике оптической записи информации, в частности, для сканирования первого и второго типов оптического носителя записи. Сущность изобретения: в устройстве источник излучения образует луч излучения первой длины волны. Образуемое этим лучом излучение в виде сканирующего или считывающего пятна точно следует по центральной линии предназначенной для считывания дорожки на носителе записи первого типа, предназначенного именно для этой длины волны. В случае считывания второго типа носителя записи, считывающее пятно в соответствии с изобретением будет точно ...

Optical reproducing apparatus

내용 없음.

Optical disc inclination detecting method, optical disc inclination controlling method, optical pickup device, and optical disc device

본 발명은 간단한 구조이며 높은 정확도로 디스크의 방사 틸트(radial tilt)를 검출할 수 있는 광 디스크 경사 검출 방법, 광 픽업 디바이스, 및 광 디스크 디바이스에 관한 것이다. The present invention relates to an optical disk tilt detection method, an optical pickup device, and an optical disk device which are simple in structure and capable of detecting the radial tilt of the disk with high accuracy. 광 디스크 경사 검출 방법에서, 광 디스크(7)로부터의 반사광으로부터 메인 스폿과 양 사이드 스폿에서의 또는 양 사이드 스폿의 트랙 교차 방향으로의 검출기(A 내지 H)로부터의 검출 신호들을 감산 또는 가산하여, DPD 신호 또는 3-스폿 에러 신호를 생성하는 한편, 메인 스폿의 트랙 교차 방향에 수직 방향으로 검출기(A 내지 D)의 검출 신호 위상을 비교함으로써 DPD 신호가 생성되어 그 차동값이 결정되고, 광 디스크의 경사각이 차동값에 기초하여 검출되므로, 광 디스크의 방사 틸트각을 검출하게 된다. In the optical disk tilt detection method, by subtracting or adding the detection signals from the detectors A to H at the main and both side spots or in the track crossing direction of both side spots from the reflected light from the optical disc 7, While generating a DPD signal or a 3-spot error signal, a DPD signal is generated by comparing the detection signal phases of the detectors A to D in a direction perpendicular to the track crossing direction of the main spot, and the differential value thereof is determined, and the optical disk Since the inclination angle of is detected based on the differential value, the radiation tilt angle of the optical disk is detected. 광 디스크, 광 픽업 장치, 방사 틸트각, 메인 스폿, 사이드 스폿, 검출기 Optical Disc, Optical Pickup Device, Radiation Tilt Angle, Main Spot, Side Spot, Detector

Optical pickup and optical recording and/or reproducing apparatus using it and method of tracking error signal detection

광원과; 입사광을 집속하여 광디스크에 포커싱하는 대물렌즈와; 광원쪽에서 입사되는 광을 회절에 의해 메인빔과 제1 및 제2서브빔으로 분할하며, 제1 및 제2서브빔에 대한 서브 푸시풀 신호의 AC 성분 진폭이 줄어들도록 제1 및 제2서브빔에 연속적으로 변화되는 파면을 형성하는 홀로그램 그레이팅과; 정보저장매체에 조사된 후 반사된 메인빔과 제1 및 제2서브빔을 수광하여, 메인빔에 대한 메인 푸시풀 신호, 제1 및 제2서브빔에 대한 서브 푸시풀 신호를 얻을 수 있도록 마련된 광검출기;를 포함하는 것을 특징으로 하는 광픽업 및 이를 사용하는 광 기록 및/또는 재생기기가 개시되어 있다. A light source; An objective lens for focusing incident light and focusing on an optical disk; The light incident from the light source side is divided into the main beam and the first and second sub beams by diffraction, and the first and second sub beams are reduced so that the AC component amplitude of the sub push-pull signal for the first and second sub beams is reduced. Hologram grating to form a wavefront that is continuously changed at; The main beam and the first and second sub beams reflected after being irradiated to the information storage medium are received to obtain a main push pull signal for the main beam and a sub push pull signal for the first and second sub beams. An optical pickup and optical recording and / or reproducing apparatus using the same are disclosed.

Patent JPS6215864Y2

Method for reproducing optical disc

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

Servo device, and optical disk data reading and writing device

본 발명은 포커스 에러를 정확하게 검출하여 포커스 서보의 성능을 향상시키는 것에 관한 것으로, 광디스크(X)에 조사되는 메인 빔(L1) 및 2개의 서브 빔(L2, L3)에서, 서브 빔의 한쪽(L2)을 상기 광디스크(X)에 대한 플러스 측에 디포커스하고, 다른쪽(L3)을 상기 광디스크(X)에 대한 마이너스 측에 디포커스한 후, 상기 서브 빔(L2, L3)의 광디스크(X) 상의 조사 범위인 2개의 서브 스폿의 스폿 사이즈를 검출하여 비교함으로써 메인 빔(L1)의 광디스크(X)에 대한 포커스 제어를 실시하는 것에 관한 것이다.

Patent JPS626580Y2

Light scanning apparatus and reflecting objective thereof and optical read and/or the write device of being furnished with this device

一种光扫描装置，包括光源9，反射物镜10和光敏探测系统20，其中的反射物镜包含有第一和第二透镜窗(14，17)及第一和第二反射镜(15，16)。第一和第二衍射元件(30，40)分别在第一窗14和第二反射镜16上，以使探测在带有记录槽的信息平面3上扫描光点V1的扫描轨迹误差和相对于信息平面3而言扫描光束b1的聚焦误差成为可能。

Optical semiconductor device

【課題】 トラックピッチの異なる複数の光ディスクに対して記録・再生を行うことが可能であると共に、高精度の組立調整が不要で、組立時間の短縮及び低コスト化を図ることが可能な光半導体装置を提供する。 【解決手段】 光半導体装置を、半導体レーザ素子１と、半導体レーザ素子１からの出射光束を、主ビームと複数の副ビームとに分岐する出射光束分岐素子２と、主ビーム及び副ビームを光ディスク５上に集光する対物レンズ４と、光ディスク５で反射された主ビーム及び副ビームをそれぞれ検出する信号検出用の受光素子８とにより構成する。そして、出射光束分岐素子２によって分岐された副ビームが、対物レンズ４への入射時に、光ディスク半径方向に２分割以下の光分布となるように構成する。 【選択図】 図１

Compatible recording and / or playback device

Optical recording device, optical head device, optical disc driving device, tracking controlling method therefor, and optical disc

정보기록매체를 회전구동하는 회전구동수단과, 정보기록매체에 대하여 광을 조사하여 정보신호의 기록 및/또는 재생을 행하는 광학헤드와, 광학헤드에 의해 검출된 신호를 처리하는 신호처리회로를 가지고, 광학헤드는, 광원과, 대물렌즈와, 신호검출수단을 갖춘다. 그리고 대물렌즈의 개구수(NA)가 0.5〈NA 0.6의 범위로 하고, 트랙피치가 다른 광기록매체의 호환성을 유지하면서도 고정밀도 광기록매체로의 기록 및/또는 재생을 안정하게 행한다. Rotation driving means for rotating the information recording medium, an optical head for irradiating light to the information recording medium to record and / or reproduce the information signal, and a signal processing circuit for processing the signal detected by the optical head; The optical head includes a light source, an objective lens, and signal detection means. The numerical aperture (NA) of the objective lens is 0.5 <NA In the range of 0.6, recording and / or reproduction on a high-precision optical recording medium is stably performed while maintaining compatibility of optical recording media having different track pitches.

Diffraction element and optical pick-up apparatus having the same

트랙피치가 다른 사양의 디스크에 사용되는 호환형 광픽업용 회절소자가 개시된다. 본 발명에 의한 광픽업용 회절소자는, 각각 소정 주기를 가지는 회절격자로 이루어진 제1 및 제2영역을 포함하며, 제1영역과 제2영역은 소정 높이차이(Δx)를 가진다. Disclosed are a diffractive element for compatible optical pickup used in discs having different track pitches. The diffraction element for optical pickup according to the present invention includes first and second regions each having a diffraction grating having a predetermined period, and the first region and the second region have a predetermined height difference Δx. 회절소자, 2분할, 단차, 위상차, 하나의 트랙 Diffraction element, two divisions, step, phase difference, one track

Apparatus and method for controlling tracking error balance in optical disc device

An apparatus and a method for controlling tracking error balance in an optical disc device are provided to record RF data on an optical disc effectively by executing the operation of controlling the tracking error balance with a proper record power value. A method for controlling tracking error balance in an optical disc device comprises a first step(S12) of searching record power value stored in a specific table in controlling the tracking error balance, and a second step(S16) of executing the operation of controlling the tracking error balance by applying the record power value lower than the searched record power value. The record power value according to manufacturer ID of an optical disc is recorded in a specific table of a nonvolatile memory. The record power value stored in the confirmed manufacturer ID is searched from the record power value according to the manufacturer ID stored in the specific table after confirming the manufacturer ID stored in a lead area of the optical disc in controlling the tracking error balance.

Optical pick-up

An optical pick-up emits three laser beams onto an optical disk. The three laser beams are reflected on the optical disk and incident to a condenser lens. The three laser beams are further incident to a holographic device via the condenser lens. The surface of the holographic device is divided into a first and a second hologram region by a bisecting line oriented almost parallel to the track formed on the optical disk. The holographic device generates ±1th-order diffracted light beams on the hologram regions. The ±1th-order diffracted light beams are incident to a photodetector having a plurality of photo-detecting segments corresponding to the ±1th-order diffracted light beams. The photodetector detects signals recorded on the optical disk based on the ±1th-order diffracted light beams.

Optimized tracking method

The invention relates to an optimized tracking method for an optical scanner along a track (1L, 1G) of an optical recording medium in which the track comprises information marks (3) arranged in close succession and has fundamental changes in properties (1L/1G, 1G/1L) that are located significantly closer to one another. The method comprises the following steps: forming a track error signal (TE, TECL, PPTE); detecting the occurrence of fundamental changes in the properties of track (1L, 1G); forming an offset value (TO) based on the comparison of the value of the track error signal (TE, TECL, PPTE), which occurs shortly before and shortly after the fundamental change in property; forming the track error signal (TE, TECL, PPTE) while taking the offset value (TO) into account, and; repeating the aforementioned steps.

OPTICAL WRITING / READING SYSTEM OF RECORDING MEDIUM AND APPLICATION TO RECORDING DISK

Système d'écriture/lecture optique d'un support d'enregistrement comportant: - au moins une source lumineuse émettant trois faisceaux (F1, F2, F3) focalisant en trois points distincts sur le support d'enregistrement; - un dispositif de diffraction créant pour chaque faisceau trois ordres de diffraction (-1, 0, +1). Les points de focalisation des trois faisceaux sont alignés selon la direction de diffraction du dispositif de diffraction et sont distants les uns des autres de manière qu'au point de focalisation de l'ordre 0 du faisceau central focalise l'ordre -1 d'un faisceau latéral et l'ordre +1 de l'autre faisceau latéral. Applications: Lecture de disques optiques. Optical writing / reading system for a recording medium comprising: - at least one light source emitting three beams (F1, F2, F3) focusing at three distinct points on the recording medium; - a diffraction device creating for each beam three orders of diffraction (-1, 0, +1). The focusing points of the three beams are aligned according to the diffraction direction of the diffraction device and are distant from each other so that the focal point of order 0 of the central beam focuses the order -1 of a side beam and the +1 order of the other side beam. Applications: Reading optical discs.

OPTICAL-TYPE HEAD-FORMING DEVICE, PARTICULARLY FOR RECORDING AND READING DATA.

APPARATUS FOR OPTICAL INFORMATION RECORDING AND REPRODUCTION

OPTICAL RECORDING / REPRODUCING APPARATUS

L'invention concerne les techniques d'enregistrement/reproduction d'information par des moyens optiques. Un appareil d'enregistrement/reproduction optique comporte notamment un double réseau de diffraction 10 qui comprend un substrat 18 et des premier et second réseaux de diffraction 11, 12. Le double réseau de diffraction reçoit la lumière qui provient d'un support d'enregistrement optique 7 et il la décompose en lumière transmise 14 et en lumière diffractée 15. Un détecteur de signal d'erreur de suivi de piste 16 et un détecteur de signal d'erreur de focalisation 17 détectent des signaux correspondants en recevant respectivement la lumière transmise 14 et la lumière diffractée 15.

RECORD CARRIER HAVING OPTICALLY READABLE PHASE STRUCTURE AND DEVICE FOR READING

OPTICAL REPRODUCING APPARATUS

OPTICAL READ / WRITE APPARATUS HAVING VERY GOOD TRACK TRACKING PERFORMANCE.

OPTICAL INFORMATION RECORDING MEDIUM AND RECORDING / REPRODUCING DEVICE USING THE SAME

L'INVENTION CONCERNE LES TECHNIQUES D'ENREGISTREMENTREPRODUCTION OPTIQUES. UN SUPPORT D'ENREGISTREMENT OPTIQUE CONFORME A L'INVENTION SE PRESENTE SOUS LA FORME D'UNE CARTE 1 QUI COMPORTE DES PISTES DE GUIDAGE 3, 3, ... DESTINEES A FOURNIR UN SIGNAL DE GUIDAGE ET DES PISTES D'HORLOGE 2, 2, ... DESTINEES A FOURNIR UN SIGNAL D'HORLOGE, QUI SONT DISPOSEES EN ALTERNANCE, ET DES ZONES D'ENREGISTREMENT 4, 4, ... PREVUES POUR L'ENREGISTREMENT D'INFORMATION ENTRE CHACUNE DES PISTES DE GUIDAGE ET CHACUNE DES PISTES D'HORLOGE. APPLICATION AUX CARTES A INFORMATIONS ENREGISTREES. THE INVENTION CONCERNS OPTICAL RECORDING-REPRODUCTION TECHNIQUES. AN OPTICAL RECORDING MEDIA CONFORMING TO THE INVENTION IS IN THE FORM OF A MAP 1 WHICH INCLUDES GUIDANCE TRACKS 3, 3, ... INTENDED TO PROVIDE A GUIDANCE SIGNAL AND CLOCK TRACKS 2, 2 , ... INTENDED TO PROVIDE A CLOCK SIGNAL, WHICH ARE ALSO AVAILABLE, AND RECORDING ZONES 4, 4, ... PROVIDED FOR THE RECORDING OF INFORMATION BETWEEN EACH GUIDANCE TRACK AND EACH TRACK CLOCK. APPLICATION TO RECORDED INFORMATION CARDS.

OPTICAL INFORMATION RECORDING AND REPRODUCING APPARATUS

L'INVENTION CONCERNE UN APPAREIL D'ENREGISTREMENT ET DE REPRODUCTION OPTIQUE D'INFORMATION. CET APPAREIL COMPREND UN GENERATEUR DE FAISCEAUX 22 POUR RAYONNER UNE PLURALITE DE FAISCEAUX DE MEME LONGUEUR D'ONDE, UN SYSTEME OPTIQUE 12, 25, 26, 27 POUR RAYONNER LA PLURALITE DE FAISCEAUX SUR LE SUPPORT D'ENREGISTREMENT D'INFORMATION 13 DE TELLE FACON QUE LES SPOTS FORMES PAR LES FAISCEAUX SOIENT DISPOSES SUIVANT LA DIRECTION DANS LAQUELLE L'INFORMATION EST ENREGISTREE ET POUR EXTRAIRE UNE PLURALITE DE FAISCEAUX REFLECHIS PAR LE SUPPORT D'ENREGISTREMENT D'INFORMATIONS, ET UN DETECTEUR OPTIQUE 16 POUR DETECTER CHAQUE FAISCEAU DE LA PLURALITE DE FAISCEAUX APRES QU'ILS ONT ETE EXTRAITS PAR LE SYSTEME OPTIQUE. L'APPAREIL A POUR BUT D'ENREGISTRER OPTIQUEMENT UNE INFORMATION SUR UN SUPPORT ET DE REPRODUIRE L'INFORMATION QUI VIENT D'ETRE ENREGISTREE. THE INVENTION RELATES TO AN APPARATUS FOR RECORDING AND OPTICAL REPRODUCTION OF INFORMATION. THIS APPARATUS INCLUDES A BEAM GENERATOR 22 TO RADIANCE A PLURALITY OF BEAMS OF THE SAME WAVELENGTH, AN OPTICAL SYSTEM 12, 25, 26, 27 TO RADIANCE THE PLURALITY OF BEAMS ON THE INFORMATION RECORDING MEDIA 13 IN SUCH A WAY THAT THE SPOTS FORMED BY THE BEAMS ARE ARRANGED FOLLOWING THE DIRECTION IN WHICH THE INFORMATION IS RECORDED AND TO EXTRACT A PLURALITY OF BEAMS REFLECTED BY THE INFORMATION RECORDING MEDIA, AND AN OPTICAL DETECTOR 16 TO DETECT EACH BEAM FROM THE PLURALITY BEAMS AFTER THEY HAVE BEEN EXTRACTED BY THE OPTICAL SYSTEM. THE PURPOSE OF THE APPLIANCE IS TO OPTICALLY RECORD INFORMATION ON A MEDIA AND TO REPRODUCE THE INFORMATION THAT HAS JUST BEEN RECORDED.

Patent FR2313731B1

Patent FR2505536B1

BODY HOLDER OF RECORDING AND HOLDER OF RECORDING FOR OPTICAL INFORMATION AND RECORDING AND READING DEVICE

L'information est enregistrée par voie optique dans un corps porteur d'enregistrement en forme de disque suivant une piste d'information. Ledit corps comporte une servo-piste composée de servo-domaines qui sont prevus en nombre élevé constant pour chaque spire de la servo-piste. Lors de l'enregistrement du projet, outre une tache d'enregistrement, également une servo-tache sur la couche d'enregistrement La vitesse tangentielle et la position radiale de la servo-tache par rapport à la servo-piste sont déterminées, ainsi on peut corriger la vitesse tangentielle et la position radiale de la tache d'enregistrement Application : enregistrement d'un programme vidéo dans un disque. The information is recorded optically in a disc-shaped recording carrier body following an information track. Said body comprises a servo-track composed of servo-domains which are provided in a constant high number for each turn of the servo-track. When recording the project, besides a recording spot, also a servo spot on the recording layer The tangential speed and the radial position of the servo spot relative to the servo track are determined, thus one can correct the tangential speed and the radial position of the recording spot Application: recording of a video program in a disc.

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.

DEVICE AND METHOD FOR MONITORING THE TRACK FOLLOWING BALANCE OF AN OPTICAL DISC READER

Optical pickup head and information recording/reproducing device

An optical pickup head is provided with a light source, a diffracting means for creating a plurality of diffracted beams, a converging means for focusing the diffracted beams onto an optical storage medium, a beam branching means for branching the plurality of beams reflected by the optical storage medium, and an optical detecting means for outputting a signal corresponding to the amount of light of the received beams. The optical detecting means has main beam light receiving portions and sub-beam light receiving portions. The amount of light of the first or higher order diffracted beams when they are substantially focused on and reflected by a focus plane of the plurality of information recording planes is equal to or greater than the amount of light of the zero order diffracted beam when it is reflected without focusing by a non-focus plane other then the focus plane of the plurality of information recording planes. The invention provides an optical pickup head where offset is not generated in the TE signals even during tracking with the objective lens when a two-layered disk is used.

Optical pick up adaptor and holographic laser hololaser

提供了通过在跟踪信号检测信号中消除DC偏置而从目标信息记录表面可靠地读信息。在以3束方法达到跟踪伺服的过程中，提供辅助光接收域D3_1、D3_2、D8_1、D8_2。该辅助光接收域接收由从与目标为读的信息记录表面不同的信息记录表面返回的光形成的图像。±1阶衍射光的副束进入光接收域D3、D8、D1、D10。相对于全息图(8)的衍射方向，在光接收域D3(D8)的两侧都提供辅助光接收域D3_1、D3_2(D8_1、D8_2)。因为以内部连接的方式计算信号：D8-(D8_1+D8_2)；和D3-(D3_1+D3_2)，可以在DPP方法中使用的RES信号(D1+D3、D8+D10)中消除DC偏置。

Optical head device

Optical Pickup Device Using Hologram Pattern and Hologram Pattern Generating Method

단일의 진정 레이저 광원(11)으로부터의 광을 홀로그램 모듈(13)에 의해 동시에 트랙상의 데이터를 판독하기 위하여 광 디스크의 복수의 트랙에 집광되는 복수의 광스폿으로 회절 및 분리시키는 형식의 광픽업 장치내에서 비점 수차 및 코마 수차가 억제된다. 홀로그램 모듈(13)의 비회절 홀로그램 패턴(14)과 회절 홀로그램 패턴(15a, 15b, 15c)은 홀로그램 모듈에 의해 회절된 광이 진정 레이저 광원(11)으로부터 광 디스크까지의 광진로내에서 광학 요소에 의해 야기된 것과 같은 역수차를 주도록 결정된다. 다른 하나의 홀로그램 패턴(14)은 광학 요소에 의하여 레이저로 형성된 균일한 강도의 광스폿을 제공한다.

Diffraction element and optical pick-up apparatus having the same

보다 정밀한 포커싱 제어를 할 수 있는 광픽업용 회절소자가 개시된다. 본 발명에 의한 광픽업용 회절소자는, 각각 소정 피치(P)로 반복되는 격자패턴이 형성된 제1 및 제2영역으로 분할되며, 상기 제1영역과 상기 제2영역 중 적어도 하나의 영역의 격자패턴은 상기 제1영역과 상기 제2영역을 분할하는 분할선(DL)과 수직한 가상의 선(VL)에 대하여, 소정각도 기울어진 것을 특징으로 한다. Disclosed is a diffractive element for optical pickup that can perform more precise focusing control. The optical pickup diffraction element according to the present invention is divided into first and second regions each having a grating pattern repeated at a predetermined pitch P, and includes a grating of at least one of the first region and the second region. The pattern is inclined at a predetermined angle with respect to the virtual line VL perpendicular to the dividing line DL dividing the first area and the second area. 회절소자, 2분할, 격자패턴, 기울어짐, 하나의 트랙, 포커싱 제어, 차동비점수차법 Diffraction element, Divided, Grating pattern, Slant, One track, Focusing control, Differential astigmatism

Photosensitive device.