WO2008044295A1 - Support d'enregistrement d'hologramme et dispositif d'hologramme - Google Patents
Support d'enregistrement d'hologramme et dispositif d'hologramme Download PDFInfo
- Publication number
- WO2008044295A1 WO2008044295A1 PCT/JP2006/320329 JP2006320329W WO2008044295A1 WO 2008044295 A1 WO2008044295 A1 WO 2008044295A1 JP 2006320329 W JP2006320329 W JP 2006320329W WO 2008044295 A1 WO2008044295 A1 WO 2008044295A1
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- WIPO (PCT)
- Prior art keywords
- hologram
- mark
- record carrier
- light
- servo
- Prior art date
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00772—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track on record carriers storing information in the form of optical interference patterns, e.g. holograms
- G11B7/00781—Auxiliary information, e.g. index marks, address marks, pre-pits, gray codes
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/08547—Arrangements for positioning the light beam only without moving the head, e.g. using static electro-optical elements
- G11B7/08564—Arrangements for positioning the light beam only without moving the head, e.g. using static electro-optical elements using galvanomirrors
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0938—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following servo format, e.g. guide tracks, pilot signals
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2250/00—Laminate comprising a hologram layer
- G03H2250/40—Printed information overlapped with the hologram
Definitions
- the present invention relates to a hologram record carrier and a hologram apparatus having a hologram recording layer capable of recording or reproducing information by irradiation with a light beam such as an optical disk or an optical card.
- Holograms capable of recording two-dimensional data at high density are attracting attention for high-density information recording.
- the feature of this hologram is that the wavefront of light carrying recorded information is recorded as a change in refractive index in volume on a recording medium that is a photosensitive material such as a photorefractive material.
- the recording capacity can be dramatically increased.
- Multiplex recording includes angle multiplexing and phase encoding multiplexing, and information can be multiplexed and recorded even in the overlapped hologram region by changing the incident angle and phase of the interfering light wave.
- an optical information recording apparatus uses a hologram record carrier as a disk to record information at an ultra-high density.
- a hologram record carrier as a disk to record information at an ultra-high density.
- an appropriate exposure time and energy in a relative stationary state between the recording medium and the writing light are required. It provides a way to keep the exposure accurate.
- Patent Document 1 shows the specific shape of the positioning mark.
- Patent Document 2 some conventional hologram record carriers have a positioning mark inside (see Patent Document 2), and others have a region for moving the hologram recording light beam in the radial direction (see FIG. (See Patent Document 3).
- Patent Documents 2 and 3 clearly show the shape of the track, address area, and positioning mark! / ,!
- Patent Document 1 JP 2005-302149 A
- Patent Document 2 JP 2005-228416
- Patent Document 3 JP 2005-203070
- NA numerical aperture
- Conventional examples are set in a situation where the servo beam is focused to the diffraction limit, so the shape of the address and position information marker is limited.
- the problem to be solved by the present invention is to provide a hologram recording carrier and a hologram device that can quickly perform hologram recording a plurality of times and can easily perform stable recording or reproduction.
- a hologram recording carrier and a hologram device that can quickly perform hologram recording a plurality of times and can easily perform stable recording or reproduction.
- the hologram record carrier according to claim 1 is a hologram record carrier on which information is recorded or reproduced by light irradiation,
- a hologram recording layer that stores an optical interference pattern by a coherent hologram recording light beam as a hologram inside, and a servo that is laminated in the film thickness direction of the hologram recording layer and is recorded with multiple marks.
- a plurality of marks extending in a direction parallel to the relative movement direction of the light spot of the hologram recording light beam irradiated onto the hologram recording carrier. It is characterized by.
- Each of the marks is more than the direction parallel to the relative movement direction of the light spot. It is preferable to have a long shape in a direction perpendicular to the moving direction. For example, when a disc-shaped hologram record carrier is used by forming a long mark in the radial direction, the mark can be detected even when the disc is decentered.
- a positioning mark having a shape different from that of the mark is arranged between the mark rows in a direction parallel to a relative movement direction of the light spot at an interval equal to the recording interval of the hologram.
- the discrimination is easy.
- an interval between adjacent mark rows in a direction perpendicular to a relative movement direction of the light spot is an interval equal to a recording interval of the hologram.
- a determination mark is arranged at an end of the mark row that also has a plurality of mark forces formed in the vertical direction between the mark rows. For example, since there is a mark indicating the radial movement area, the movement in the radial direction can be performed accurately.
- the hologram device wherein a hologram recording layer that stores therein an optical interference pattern by a coherent hologram recording light beam as a hologram, and a plurality of marks laminated in the film thickness direction of the hologram recording layer
- the servo recording layer is recorded with force, and the marks are arranged in a direction parallel to the relative movement direction of the light spot of the hologram recording light beam irradiated onto the hologram record carrier.
- a hologram device of a hologram record carrier which is extended as a plurality of mark rows and records or reproduces hologram information by light irradiation,
- the light spot is focused on the mark of the servo layer and the return light power of the mark is read to perform servo control for tracking the light spot in accordance with the movement of the hologram record carrier and the hologram recording.
- the relative positional relationship between the carrier and the light spot is controlled.
- the light spot on the servo layer has a longer and longer shape in a direction perpendicular to the moving direction than in a direction parallel to a relative moving direction of the light spot. That's right.
- the address mark and positioning mark can be detected even when the disc is decentered.
- FIG. 1 shows a disk-shaped hologram record carrier 2 on which information is recorded or reproduced by light irradiation, which is an example of the present embodiment.
- a plurality of marks M are pre-recorded to form a row, and a plurality of concentric circles extend as a row of marks.
- the hologram record carrier 2 includes a hologram recording layer 7, a servo layer 5, and a protective layer 8 laminated on a substrate 3.
- the hologram recording carrier 2 includes a hologram recording layer 7 that stores therein an optical interference pattern by a hologram recording light flux of coherent reference light and signal light as a hologram (diffraction grating), and a servo laminated in the film thickness direction. With layer 5. Further, as shown in FIG. 3, it may be a hologram record carrier 2 in which the protective layer 8 is omitted.
- a light-sensitive material, a photorefractive material, a hole burning material, a photochromic material, or the like that is sensitive to the wavelength of the hologram recording light beam (reference light and signal light) is used.
- the material strength of the hologram recording layer 7 is selected so that it is not sensitive to the wavelength of the servo beam SB.
- the substrate 3 is not particularly limited as a material.
- glass polycarbonate, amorphous polyolefin, polyimide, PET, PEN, PES and other plastics, and ultraviolet curable acrylic resin can be used.
- the protective layer 8 is made of a light-transmitting material, and has a function of flattening the laminated structure and protecting the hologram recording layer and the like.
- a plurality of marks M are recorded in advance on the servo layer 5 laminated in the film thickness direction of the hologram recording layer 7.
- the mark M is made of a material that is almost insensitive to the hologram recording light beam.
- mark M has reflectivity only at the wavelength of servo beam SB.
- a wavelength selective reflection film For example, a wavelength selective reflection film.
- the mark M forms a row in the direction parallel to the relative movement direction of the signal light GB light spot of the irradiated hologram recording light beam, and a plurality of mark rows MRW extend.
- a plurality of mark rows MRW extending without intersecting with the servo layer 5 can be formed by printing or the like.
- the recording area in which the hologram (book) is to be recorded and the mark row MRW are arranged at different positions even in the plane of the hologram recording carrier 2. Therefore, as shown in FIG. 4, the optical axis of the servo beam SB is formed at a predetermined distance from the optical axis of the signal beam GB so that the optical spot of the servo beam SB is formed at a position shifted from the optical axis of the signal beam GB. Away.
- the mark row MRW is composed of an alternating arrangement of high !, reflectivity mark M and non-mark nM (flat portion) between them.
- Each of the marks M in the mark row MRW has a long shape in a direction perpendicular to the moving direction rather than a direction parallel to the relative moving direction of the servo light spot to be irradiated.
- the mark string MRW should be formatted in the order of character Z data Z check digit Z stop character with margins (margins) at both ends of the mark M as mark codes. Can do.
- Start and stop characters are characters that indicate the beginning and end of data, such as ⁇ * "," a "," b “,” c “,” d “, etc.
- Data is represented as information.
- the mark patterns of the characters are arranged in order from the reading side, for example, the address data “0123” can be expressed by arranging them in order.
- the check digit is a numerical value that is calculated and is added immediately after the mark code data in order to check for reading errors.
- the length of the mark string MRW that is, the mark code is preferably a length including margins at both ends.
- the width of the mark code should be long in the radial direction because it moves in the radial direction when disk eccentricity occurs. If the mark code width is narrow, The robot beam may be out of the mark code power and may not be read stably. It is preferable to secure 15% or more of the length of the mark code.
- the data of the mark row MRW includes an address mark indicating the address of the hologram recording portion of the hologram recording layer, and various information related thereto (compression method information, material information, information such as laser power and recording wavelength). ).
- the mark row MRW is also used for servo control of at least the tracking servo of the objective lens for light beam irradiation.
- the mark row MRW can be formed in a spiral shape or a plurality of divided spiral arcs in addition to a concentric shape on the center of the substrate.
- FIG. 1 An example of a disk-shaped hologram record carrier (Fig. 1) in which address marks indicating the addresses of the portions of the hologram recording layer to be recorded as holograms are recorded as mark rows MRW will be described.
- the mark code area MCR consisting of mark rows carries information indicating the book address. As shown in FIG. 6, an address mark ADM (mark code area MCR) and a positioning mark PAM are recorded in advance on a servo layer 5 different from the hologram recording layer 7.
- the address mark ADM is arranged at a position where the hologram recording light beam (signal light GB) is not transmitted, and one positioning mark PAM that makes contact with one mark code area MCR is a pair.
- the positioning mark PAM has such a shape that the position in the radial direction and the tangential direction can be detected when the servo light beam SB traces the mark row of the servo layer 5.
- the positioning mark PAM that has the light and dark power obtained by dividing the square shape shown in Fig. 6 into four equal squares, a pair of light spots is obtained when the servo beam SB is present at the center of the positioning mark PAM. It is assumed that the dark portion is arranged at the corner quadrant position.
- the address mark ADM is formed as a mark M longer in the radial direction of the hologram record carrier than in the tangential direction.
- the length M (in the radial direction) of the mark M is the size that does not protrude from the address mark ADM when the light spot of the servo beam SB exists in the center even if the hologram record carrier is decentered!
- the radial length At of the mark M is determined as follows.
- the total length of the mark code area MCR and the positioning mark PAM as a pair coincides with the book recording interval Hrp in the tangential direction (optical disc rotation direction) of the hologram record carrier.
- a set of an address mark ADM and a positioning mark PAM extending in the tangential direction is also arranged to coincide with the book recording interval Htp.
- two adjacent positioning marks PAM in the tangential direction of the hologram record carrier are formed at the same interval as the book recording interval Hrp.
- the set of address mark ADM and positioning mark PAM is formed in the radial direction of the hologram record carrier like the track of an optical disk. Therefore, the track pitch is such that the distance between adjacent mark rows in the radial direction coincides with the book recording interval Hrp in the radial direction.
- the address mark ADM of these mark rows is determined to have a spacing and a width so that the hologram recording light beam FB does not pass through. Therefore, no noise or the like is given to the recording / reproducing light beam.
- the hologram recording beam FB is applied to the address mark ADM for some reason, there is no problem because it is made of a material sensitive only to the servo beam SB.
- Hrp and Hrp may not be equal.
- the optical disk may be eccentric. The radial width At of the mark code area MCR is set so wide that the light spot of the servo beam SB does not protrude even if the hologram record carrier is decentered.
- FIG. 7 shows an example of a schematic configuration of an angle multiplexing type hologram apparatus for recording or reproducing information of a hologram record carrier to which the present invention is applied.
- the hologram apparatus in FIG. 7 includes a reference light mirror drive circuit MD, a spindle motor 22 that rotates the disk of the hologram record carrier 2 via a turntable, a pickup 23 that reads a signal by a hologram record carrier 2 force light beam, Pick-up coarse drive unit 24 that holds the pickup and moves it in the radial direction, first light source drive circuit 25a, second light source drive circuit 25b, spatial light modulator drive circuit 26, reproduction light signal detection circuit 27, servo signal processing Logic circuit 28, pickup position detection circuit 31 connected to the pickup coarse movement drive unit 24 for detecting the position signal of the pickup, slider servo circuit 32 connected to the pickup coarse movement drive unit 24 and supplying a predetermined signal thereto, spindle motor 22 is connected to the rotation speed detection unit 33 for detecting the rotation speed signal of the spindle motor, and connected to the rotation speed detection unit.
- the hologram hologram apparatus has a control circuit 37.
- the control circuit 37 includes a reference light mirror one drive circuit MD, a first light source drive circuit 25a, a second light source drive circuit 25b, and a spatial light modulator drive circuit. 26, playback light signal detection circuit 27, servo signal processing circuit 28, pickup position detection circuit 31, slider servo circuit 32, rotation speed detection unit 33, rotation position detection circuit 34, and spindle servo circuit 35 .
- the control circuit 37 Based on a predetermined signal, the control circuit 37 performs servo control of coarse movement and fine movement related to the pickup, control of the reproduction position (radius and tangential position), and the like via these drive circuits.
- the control circuit 37 is a microcomputer equipped with various memories and controls the entire device. Various control operations are performed according to the operation input by the user from the operation unit (not shown) and the current operation status of the device. In addition to generating a control signal, the display unit (not shown) displays the operating status to the user. It is connected.
- control circuit 37 executes processing such as signing of the data to be recorded on the hologram input from the external force, and supplies a predetermined signal to the spatial light modulator drive circuit 26 to generate a hologram recording sequence. Control.
- the control circuit 37 restores the data recorded on the hologram record carrier by performing demodulation and error correction processing based on the signal from the reproduction optical signal detection circuit 27. Further, the control circuit 37 reproduces the information data by performing a decoding process on the restored data, and outputs this as reproduced information data.
- control circuit 37 includes thumbnail information of content information (for example, image data) from which hologram data power to be recorded is obtained, a compression method at the time of hologram recording, an encoding / decoding method, a laser power, Processing such as data sign related to hologram data such as recording wavelength is executed. Based on the signal supplied from the servo signal processing circuit 28, the control circuit 37 performs hologram recording using the information on the mark row MRW recorded on the servo layer of the hologram record carrier.
- thumbnail information of content information for example, image data
- a compression method at the time of hologram recording for example, an encoding / decoding method, a laser power
- Processing such as data sign related to hologram data such as recording wavelength is executed.
- the control circuit 37 Based on the signal supplied from the servo signal processing circuit 28, the control circuit 37 performs hologram recording using the information on the mark row MRW recorded on the servo layer of the hologram record carrier.
- FIG. 8 shows a schematic configuration of the pickup 23 of the hologram device.
- the pick-up that works is a configuration in which an optical system for detecting information of the mark row MRW, such as a servo optical system, is added to the pickup of a general angular multiplexing hologram device.
- the pickup 23 is roughly divided into a hologram recording / reproducing optical system, a servo optical system, and a common system.
- the hologram recording / reproducing optical system includes a first laser light source LD1, a first collimator lens CL1, a half mirror prism HP, a spatial light modulator SLM connected to a first light source driving circuit 25a for recording and reproducing a hologram.
- Reproduction including image sensor IS connected to reproduction optical signal detection circuit 27 such as array lens such as objective lens OBA, objective lens OBB, load coupling device (CCD) and complementary metal oxide semiconductor device (CMOS) It consists of an optical signal detector, aperture, APP, galvanometer mirror GM, and 4f optical system illumination lenses ILB and ILA.
- the pair of objective lenses OBA and OBB are arranged on a straight line so that their focal points coincide with each other, and a spatial light modulator SLM and an image sensor IS are arranged in a conjugate manner at the store positions at both ends.
- the hologram record carrier 2 is arranged with the common focus of the pair of objective lenses OBA and OBB removed.
- Space light The modulator SLM has a function of electrically transmitting or blocking incident light on a pixel-by-pixel basis using a transmissive liquid crystal panel having a plurality of pixel electrodes divided in a matrix.
- This spatial light modulator SLM is connected to the spatial light modulator drive circuit 26, and the page data to be recorded from the spatial light modulator drive circuit 26 (information pattern of two-dimensional data such as bright and dark dot patterns on a plane).
- the light beam is modulated so as to have a distribution based on) to generate signal light.
- the servo optical system servo-controls (moves in the radial, tangential, and focusing directions) the position of the servo beam with respect to the hologram record carrier 2 (moving in the radial, tangential, and focusing directions), so that the second laser light source LD2, the second collimator lens Consists of servo signal detector including CL2, polarizing beam splitter PBS, condenser lens CBL, 1Z4 wavelength plate ⁇ ⁇ ⁇ 4 ⁇ , detector lens AS, and photodetector PD.
- the servo optical system is also used for reproducing information of the mark row MRW from the servo layer 5.
- the wavelength of the second laser light source LD2 of the servo optical system is set to a wavelength different from the wavelength of the first laser light source LD1 of the recording system.
- the servo beam SB is set at a position where the optical axis of the signal beam GB is shifted so that it is focused on the address mark ADM of the servo layer 5 by the objective lens OBA that focuses the signal beam GB.
- the reflected light of the servo beam SB reflected by the servo layer 5 is detected by the photodetector PD via the objective lens OBA of the servo optical system.
- Positioning mark The photodetector for detecting PAM is made up of four light receiving elements.
- the dichroic prism DP and the objective lens OBA are a common system.
- the pickup 23 includes the objective lens OB in a direction parallel to its optical axis (focusing direction), a parallel direction (tangential direction) and a perpendicular direction (radial direction) to the mark row MRW. ) Is provided with a pick-up fine movement drive unit 36.
- the photodetector PD of the servo signal detector is connected to the servo signal processing circuit 28.
- the photodetector PD has a light receiving element for focusing, radius, and tangential movement control of the servo beam.
- the output signal such as the mark signal RF of the photodetector PD force, the focus error signal, and the tracking error signal is supplied to the servo signal processing circuit 28.
- a drive signal is also generated for these error signal forces, and this is supplied to the pickup fine movement drive unit 36 via the control circuit 37.
- Pickup fine The dynamic drive unit 36 operates to finely adjust the pickup position.
- the pickup is finely driven by the drive current according to the drive signals in the radius, tangential direction, and focusing direction, and the position of the light spot irradiated on the hologram record carrier is displaced. This makes it possible to ensure the hologram formation time by keeping the relative position of the light spot relative to the hologram record carrier during the recording motion.
- the control circuit 37 generates a slider drive signal based on the position signal from the operation unit or the pickup position detection circuit 31 and the radial movement error signal from the servo signal processing circuit 28, and generates this slider drive signal 32. To supply.
- the slider servo circuit 32 moves the pick-up 23 in the radial direction of the disk via the pick-up coarse drive unit 24 according to the drive current generated by the slider drive signal.
- the rotation speed detection unit 33 detects a frequency signal indicating the current rotation frequency of the spindle motor 22 that rotates the hologram record carrier 2 with a turntable, and generates a rotation speed signal indicating the corresponding spindle rotation speed.
- the rotation position detection circuit 34 is supplied.
- the rotational position detection circuit 34 generates a rotational speed position signal and supplies it to the control circuit 37.
- the control circuit 37 generates a spindle drive signal, supplies it to the spindle servo circuit 35, controls the spindle motor 22 and rotates the hologram record carrier 2.
- the operation of the hologram recording optical system is as follows.
- the divergent light emitted from the first laser light source LD 1 is converted into a parallel light beam by the first collimator lens CL 1 and separated into two optical paths by the noise mirror prism HP.
- the light branched to the mirror prism MP by the half mirror prism HP is reflected here and incident on the spatial modulator SLM, where it is spatially modulated in accordance with the page data to become the signal light GB.
- the signal light GB passes through the dichroic prism DP combined with the servo optical system, enters the object lens OBA, and enters the hologram record carrier 2.
- the aperture of the reference light RB is limited by the aperture APP and is converted into an appropriate light beam diameter.
- Reflected by galvo mirror GM The reflected reference light RB is incident on the 4f optical system formed by the irradiation lenses ILB and ILA and intersects with the signal light GB in the hologram record carrier 2.
- the hologram HG (diffraction grating) is angle-multiplexed in the record carrier 2 and a plurality of holograms (books) are recorded. After recording a book, the hologram record carrier 2 is moved and the book is recorded again in another area.
- the galvanomirror GM is driven by a reference light mirror drive circuit MD that controls an actuator that rotates its rotating shaft.
- recording information different for each angle can be multiplexed and recorded in the same area by slightly changing the angle of the reference light with respect to the signal light in the hologram record carrier at the time of recording.
- a so-called 4f optical system and a gallon mirror are used as a mechanism for changing the angle of the reference light applied to the hologram record carrier, and as shown in FIG.
- a plurality of 4f lenses are arranged so that their focal points coincide with each other, the rotation axis of the galvano mirror GM is arranged at the lens focal point at one end, and the recording layer of the hologram record carrier 2 is arranged at the lens focal point at the other end (conjugate position)
- the signal light GB irradiation is stopped by setting the spatial light modulator SLM in a light-shielded state, and only the reference light RB is incident on the hologram recording carrier 2 at a predetermined angle to generate the hologram force signal light. Is reconstructed and photoelectrically converted to page data by the image sensor IS.
- the operation of the servo optical system is as follows.
- the divergent light emitted from the second laser light source LD2 having a wavelength different from that of the hologram recording light beam FB is converted into a parallel light beam by the second collimator lens CL2, and is polarized as a servo light beam SB. Transmitted and synthesized with the holographic recording optical system by the dichroic prism DP.
- the converging lens CBL of the servo optical system condenses the servo beam SB in combination with the objective lens OBA onto the servo layer 5 of the hologram record carrier 2 so as to have a certain light spot diameter! / . This light spot is not necessarily focused to the diffraction limit.
- the recording area of the book and the address mark ADM mark code area MCR is different in the two planes of the hologram record carrier, so the light spot of the servo beam SB is formed so as to be shifted from the optical axis of the signal light GB. The axes are shifted.
- the light reflected from the servo layer 5 is transmitted through the polarization beam splitter PBS and the servo optical system.
- the light is detected by the photodetector PD through the detection lens AS.
- the hologram record carrier 2 is moved (rotated) in the tangential direction. By this movement, the signal of the mark code area MCR can be detected and the book address to be recorded can be known.
- the positioning mark PAM is used to know the location of the next book to be recorded.
- the positioning mark PAM is arranged at an interval equal to the interval between books, and the shape can be determined by reading with the servo beam SB.
- the photodetector PD includes light receiving elements A1 to A4 having a light receiving surface divided into four equal parts along the radial direction and the linear direction for receiving the servo light beam SB. .
- the direction of the four dividing lines corresponds to the disk radial direction and mark row MRW (tangential direction).
- the photodetector PD is set so that the reflected light spot when the servo light beam SB is focused is a circle centered on the center of the divided intersection of the light receiving elements A1 to A4.
- the servo signal processing circuit 28 generates various signals according to the output signals of the light receiving elements A1 to A4 of the photodetector PD.
- FIG. 10 shows a method for detecting the positioning mark PAM.
- the photodetector PD shown in Fig. 9 is used for error detection.
- the return light is detected by the light receiving element A2 in one quadrant of the photodetector (timing 2). Further, it is detected by the Al and A2 photodetectors, and at the mark position, it is detected by the Al and A3 light receiving elements (timing 3).
- the light beam of servo beam SB moves away from the marker, the return light is detected by the opposite light receiving element (timing 4).
- the address mark ADM and positioning mark PAM other than providing a blank (margin) between the mark code area MCR and the positioning mark PAM as in Example 1 A shape modification is shown.
- the positioning mark PAM1 is set longer in the radial direction in the tangential direction.
- the mark code area MCR is shifted in the radial direction alternately between each book. This makes it possible to determine that the mark is close when the output from the light receiving elements Al and A2 of the photodetector changes to detection of A3 and A4.
- the positioning mark PAM should be divided into bright and dark shapes symmetrical in the radial and tangential directions.
- FIG. 14 shows a schematic configuration of the pickup 23 of the second embodiment.
- the pickup 23 shapes the light beam shape so that the servo light beam SB becomes longer in the radial direction of the hologram record carrier 2.
- Astigmatism generating means (for example, a cylindrical lens) 100 is used as the first laser light source LD 1 of the servo optical system.
- the hologram recording optical system is the same as that of Example 1 in FIG. 8 except that the hologram recording optical system is disposed between the first collimator lens CL 1 and the first collimator lens CL 1. As shown in FIG.
- the servo beam SB2 can be elongated in the radial direction of the hologram record carrier 2 by an optical element that generates astigmatism, so that when the hologram record carrier 2 moves in the tangential direction, the servo beam SB2 Even if the proper position (2 in Fig. 15) moves slightly in the radial direction (eccentricity in the case of an optical disk) (1 or 3 in Fig. 15), the servo beam SB is in the mark code area MCR, Positioning mark Does not protrude from PAM. As a result, good positioning can be performed even if an error occurs in the variation of the hologram record carrier 2 or the mechanism for moving the hologram record carrier 2, so that the book can be recorded at an accurate interval.
- FIG. 15 shows a schematic configuration of the hologram record carrier of Example 3, particularly a configuration of a mark row having a plurality of mark forces formed on the servo layer.
- the third embodiment is the same as the pattern of the mark code area MCR and the positioning mark PAM of the first embodiment shown in FIG. 6 except that a mark row MRW2 extending in the radial direction is added.
- a second positioning mark PAM2 having a shape different from the positioning mark PAM extending in the tangential direction is located at the intersection of the mark row MRW 2 (address mark ADM) extending in the radius and the mark row MRW extending in the tangential direction Can also be arranged.
- ADM address mark ADM
- the second positioning mark PAM4 at the intersecting point is a shape in which the mark shape of the previous positioning mark PAM is negative-positive inverted.
- the servo light beam SB completes the tangential direction positioning of the hologram record carrier 2, By moving in the radial direction, the address in the radial direction can be read from the mark row MRW2. Radial movement is done with the same algorithm as tangential movement.
- the signal detected by the servo light beam SB is processed, so that the movement from the tangential direction to the radial direction can be realized.
- the radial direction address may be located only at a specific location on the hologram record carrier 2. And may be at certain intervals
- the hologram recording carrier disk 2 is described as an example of the recording medium.
- the shape of the hologram recording carrier is not limited to the disk shape.
- It may be a hologram recording carrier of a rectangular parallel plate optical card 20a which has a force such as plastic.
- the mark row MRW may be formed in a spiral shape, a spiral arc shape or a concentric shape with respect to the center of gravity of the substrate, for example, or a plurality of mark row MRWs may be arranged in parallel on the substrate! / But! /
- FIG. 1 is a plan view showing a hologram record carrier according to an embodiment of the present invention.
- FIG. 2 is a schematic partial sectional view showing a hologram record carrier according to an embodiment of the present invention.
- FIG. 3 is a schematic partial sectional view showing a hologram record carrier according to another embodiment of the present invention.
- FIG. 4 is an enlarged partial plan view showing a part of a mark row of a hologram record carrier of an embodiment according to the present invention.
- FIG. 5 is an enlarged partial plan view showing a part of a mark row of a hologram record carrier of an embodiment according to the present invention.
- FIG. 6 is an enlarged partial plan view showing a part of a mark row of the hologram record carrier of the embodiment according to the present invention.
- FIG. 7 is a block diagram showing a schematic configuration of a hologram device for recording or reproducing information on a hologram record carrier of an embodiment according to the present invention.
- FIG. 8 is a schematic perspective view showing an outline of a pickup of a hologram apparatus for recording / reproducing information on a hologram record carrier of an embodiment according to the present invention.
- FIG. 9 is a plan view showing a photodetector in a pickup of a hologram apparatus for recording / reproducing information on a hologram record carrier according to an embodiment of the present invention.
- FIG. 10 is a graph illustrating a position error signal for detecting a positioning mark of the hologram record carrier according to the embodiment of the present invention.
- FIG. 11 is an enlarged partial plan view showing a part of a mark row of a hologram record carrier of another embodiment according to the present invention.
- FIG. 12 is an enlarged partial plan view showing a part of a mark row of a hologram record carrier of another embodiment according to the present invention.
- FIG. 13 is a plan view showing a part of a mark row of a hologram record carrier of another embodiment according to the present invention.
- FIG. 14 is a schematic perspective view showing an outline of a pickup of a hologram apparatus for recording / reproducing information on a hologram record carrier of another embodiment according to the present invention.
- FIG. 15 is an enlarged partial plan view showing a part of a mark row of a hologram record carrier of another embodiment according to the present invention.
- FIG. 16 is an enlarged partial plan view showing a part of a mark row of a hologram record carrier of another embodiment according to the present invention.
- FIG. 17 is an enlarged partial plan view showing a part of a mark row of a hologram record carrier of another embodiment according to the present invention.
Landscapes
- Optical Recording Or Reproduction (AREA)
- Holo Graphy (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/441,831 US20090268267A1 (en) | 2006-10-11 | 2006-10-11 | Hologram recording carrier and hologram apparatus |
JP2008538533A JP4768820B2 (ja) | 2006-10-11 | 2006-10-11 | ホログラム記録担体およびホログラム装置 |
PCT/JP2006/320329 WO2008044295A1 (fr) | 2006-10-11 | 2006-10-11 | Support d'enregistrement d'hologramme et dispositif d'hologramme |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2006/320329 WO2008044295A1 (fr) | 2006-10-11 | 2006-10-11 | Support d'enregistrement d'hologramme et dispositif d'hologramme |
Publications (1)
Publication Number | Publication Date |
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WO2008044295A1 true WO2008044295A1 (fr) | 2008-04-17 |
Family
ID=39282506
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/320329 WO2008044295A1 (fr) | 2006-10-11 | 2006-10-11 | Support d'enregistrement d'hologramme et dispositif d'hologramme |
Country Status (3)
Country | Link |
---|---|
US (1) | US20090268267A1 (ja) |
JP (1) | JP4768820B2 (ja) |
WO (1) | WO2008044295A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2014087460A1 (ja) * | 2012-12-03 | 2014-06-12 | 日立コンシューマエレクトロニクス株式会社 | 記録再生装置 |
JPWO2014083671A1 (ja) * | 2012-11-30 | 2017-01-05 | 日立コンシューマエレクトロニクス株式会社 | 記録再生装置及び記録媒体 |
JP2021118022A (ja) * | 2020-01-21 | 2021-08-10 | アメシスタム ストレージ テクノロジー カンパニー リミテッドAmethystum Storage Technology Co., Ltd. | 光ディスクヘッド位置を正確に検出および制御するための方法、光ディスク並びに装置 |
Families Citing this family (3)
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US9721906B2 (en) * | 2015-08-31 | 2017-08-01 | Intel Corporation | Electronic package with corner supports |
CN115497516A (zh) * | 2021-06-17 | 2022-12-20 | 广东紫晶信息存储技术股份有限公司 | 一种全息存储光路系统及其光束校准方法 |
CN115910120A (zh) * | 2021-08-12 | 2023-04-04 | 广东紫晶信息存储技术股份有限公司 | 全息存储光盘的光道格式及其编码方法 |
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- 2006-10-11 US US12/441,831 patent/US20090268267A1/en not_active Abandoned
- 2006-10-11 JP JP2008538533A patent/JP4768820B2/ja not_active Expired - Fee Related
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JPWO2014083671A1 (ja) * | 2012-11-30 | 2017-01-05 | 日立コンシューマエレクトロニクス株式会社 | 記録再生装置及び記録媒体 |
WO2014087460A1 (ja) * | 2012-12-03 | 2014-06-12 | 日立コンシューマエレクトロニクス株式会社 | 記録再生装置 |
JP2021118022A (ja) * | 2020-01-21 | 2021-08-10 | アメシスタム ストレージ テクノロジー カンパニー リミテッドAmethystum Storage Technology Co., Ltd. | 光ディスクヘッド位置を正確に検出および制御するための方法、光ディスク並びに装置 |
JP7128257B2 (ja) | 2020-01-21 | 2022-08-30 | アメシスタム ストレージ テクノロジー カンパニー リミテッド | 光ディスクヘッド位置を正確に検出および制御するための方法、光ディスク並びに装置 |
Also Published As
Publication number | Publication date |
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US20090268267A1 (en) | 2009-10-29 |
JP4768820B2 (ja) | 2011-09-07 |
JPWO2008044295A1 (ja) | 2010-02-04 |
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