WO2014091531A1 - 光情報再生装置及び光情報再生方法 - Google Patents
光情報再生装置及び光情報再生方法 Download PDFInfo
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- WO2014091531A1 WO2014091531A1 PCT/JP2012/081873 JP2012081873W WO2014091531A1 WO 2014091531 A1 WO2014091531 A1 WO 2014091531A1 JP 2012081873 W JP2012081873 W JP 2012081873W WO 2014091531 A1 WO2014091531 A1 WO 2014091531A1
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- 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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- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
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- G—PHYSICS
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- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
- G03H1/2645—Multiplexing processes, e.g. aperture, shift, or wavefront multiplexing
- G03H1/265—Angle multiplexing; Multichannel holograms
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- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/083—Disposition or mounting of heads or light sources relatively to record carriers relative to record carriers storing information in the form of optical interference patterns, e.g. holograms
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- 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
Definitions
- the present invention relates to an apparatus and method for reproducing information using holography.
- the Blu-ray Disc (TM) standard using a blue-violet semiconductor laser makes it possible to commercialize an optical disc having a recording density of about 100 GB even for consumer use. In the future, it is desired to increase the capacity of optical disks exceeding 500 GB.
- TM Blu-ray Disc
- a high-density technology by a new method different from the conventional high-density technology by shortening the wavelength and increasing the NA of the objective lens is necessary.
- Patent Document 1 JP-A-2004-272268
- This publication describes a so-called angle multiplex recording method in which multiplex recording is performed by displaying different page data on a spatial light modulator while changing the incident angle of the reference light to the optical information recording medium.
- Patent Document 2 Japanese Patent Application Laid-Open No. 2011-227967
- This publication states that “diffracted light diffracted by irradiating an optical information recording medium on which information is recorded with light for adjustment that has at least a part of the amplitude distribution and phase distribution identical to the signal light at the time of recording. The angle at which the reference light is incident on the optical information recording medium is controlled based on the information detected by the detector and the detected information.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide an optical information reproducing apparatus and method capable of appropriately correcting reference light multiplexing and vertical angle and wavelength during data reproduction.
- the above problem can be solved by, for example, dividing the reference light into a plurality of parts and detecting the plurality of reference lights after passing through the recording medium.
- an optical information reproducing apparatus and method capable of appropriately correcting the reference light multiplexing and the vertical angle and wavelength in the holographic memory during data reproduction.
- Schematic diagram showing an embodiment of an optical information recording / reproducing apparatus Schematic showing an embodiment of a pickup in an optical information recording / reproducing apparatus Schematic showing an embodiment of a pickup in an optical information recording / reproducing apparatus Schematic showing an embodiment of a pickup in an optical information recording / reproducing apparatus Schematic showing an embodiment of the operation flow of the optical information recording / reproducing apparatus Schematic showing the Example of the signal generation circuit in an optical information recording / reproducing apparatus Schematic showing the Example of the signal processing circuit in an optical information recording / reproducing apparatus Schematic showing the Example of the operation
- movement flow of a signal generation circuit and a signal processing circuit Schematic showing an embodiment of a layer structure of an optical information recording medium having a reflective layer
- Schematic showing an example of a book recording order in a book case in an optical information recording / reproducing apparatus Schematic showing the
- FIG. 1 is a block diagram showing a recording / reproducing apparatus for an optical information recording medium that records and / or reproduces digital information using holography.
- the optical information recording / reproducing device 10 is connected to an external control device 91 via an input / output control circuit 90.
- the optical information recording / reproducing apparatus 10 receives the information signal to be recorded from the external control device 91 by the input / output control circuit 90.
- the optical information recording / reproducing apparatus 10 transmits the reproduced information signal to the external control apparatus 91 by the input / output control circuit 90.
- the optical information recording / reproducing apparatus 10 includes a pickup 11, a reproduction reference light optical system 12, a cure optical system 13, a disk rotation angle detection optical system 14, and a rotation motor 50.
- the optical information recording medium 1 is a rotation motor. 50 can be rotated.
- the pickup 11 plays a role of emitting reference light and signal light to the optical information recording medium 1 and recording digital information on the recording medium using holography.
- the information signal to be recorded is sent by the controller 89 to the spatial light modulator in the pickup 11 via the signal generation circuit 86, and the signal light is modulated by the spatial light modulator.
- the reproduction reference light optical system 12 When reproducing the information recorded on the optical information recording medium 1, the reproduction reference light optical system 12 generates a light wave that causes the reference light emitted from the pickup 11 to enter the optical information recording medium in a direction opposite to that during recording. Generate. Reproduction light reproduced by the reproduction reference light is detected by a photodetector (to be described later) in the pickup 11, and a signal is reproduced by the signal processing circuit 85.
- the multiplexing of the reference light and the angle in the vertical direction are corrected by a mirror with an actuator in the pickup 11.
- the multiple vertical angle corrector control signal generation circuit 92 receives the signal from the pickup 11, creates a control signal for correcting the angle of the reference light and the vertical direction, and outputs the control signal to the multiple vertical angle corrector drive circuit 93. To do.
- the multiple vertical angle corrector drive circuit 93 receives the control signal from the multiple vertical angle corrector control signal generation circuit 92 and drives the mirror with the actuator in the pickup 11 so that the multiple of the reference light and the angle in the vertical direction are obtained. to correct.
- the irradiation time of the reference light and the signal light applied to the optical information recording medium 1 can be adjusted by controlling the opening / closing time of the shutter in the pickup 11 via the shutter control circuit 87 by the controller 89.
- the cure optical system 13 plays a role of generating a light beam used for pre-cure and post-cure of the optical information recording medium 1.
- Precure is a pre-process for irradiating a predetermined light beam in advance before irradiating the desired position with reference light and signal light when recording information at a desired position in the optical information recording medium 1.
- Post-cure is a post-process for irradiating a predetermined light beam after recording information at a desired position in the optical information recording medium 1 so that additional recording cannot be performed at the desired position.
- the disk rotation angle detection optical system 14 is used to detect the rotation angle of the optical information recording medium 1.
- a signal corresponding to the rotation angle is detected by the disk rotation angle detection optical system 14, and a disk rotation motor control circuit is detected by the controller 89 using the detected signal.
- the rotation angle of the optical information recording medium 1 can be controlled via 88.
- a predetermined light source driving current is supplied from the light source driving circuit 82 to the light sources in the pickup 11, the cure optical system 13, and the disk rotation angle detection optical system 14, and each light source emits a light beam with a predetermined light amount. Can do.
- the pickup 11 and the disc cure optical system 13 are provided with a mechanism capable of sliding the position in the radial direction of the optical information recording medium 1, and the position is controlled via the access control circuit 81.
- the recording technology using the principle of angle multiplexing of holography tends to have a very small tolerance for the deviation of the reference beam angle.
- a mechanism for detecting the deviation amount of the reference beam angle is provided in the pickup 11, a servo control signal is generated by the servo signal generation circuit 83, and the deviation amount is corrected via the servo control circuit 84. It is necessary to provide a servo mechanism for this purpose in the optical information recording / reproducing apparatus 10.
- the pickup 11, the cure optical system 13, and the disk rotation angle detection optical system 14 may be simplified by combining several optical system configurations or all optical system configurations into one.
- FIG. 2 shows a recording principle in an example of a basic optical system configuration of the pickup 11 in the optical information recording / reproducing apparatus 10.
- the light beam emitted from the light source 301 passes through the collimator lens 302 and enters the shutter 303.
- the shutter 303 When the shutter 303 is open, after the light beam passes through the shutter 303, the optical ratio of the p-polarized light and the s-polarized light becomes a desired ratio by the optical element 304 composed of, for example, a half-wave plate.
- the optical element 304 composed of, for example, a half-wave plate.
- the light is incident on a PBS (Polarization Beam Splitter) prism 305.
- PBS Polarization Beam Splitter
- the light beam that has passed through the PBS prism 305 functions as signal light 306, and after the light beam diameter is expanded by the beam expander 308, the light beam passes through the phase mask 309, the relay lens 310, and the PBS prism 311 and passes through the spatial light modulator 312. Is incident on.
- the signal light to which information is added by the spatial light modulator 312 reflects the PBS prism 311 and propagates through the relay lens 313 and the spatial filter 314. Thereafter, the signal light is condensed on the optical information recording medium 1 by the objective lens 315.
- the light beam reflected from the PBS prism 305 functions as reference light 307 and is set to a predetermined polarization direction according to recording or reproduction by the polarization direction conversion element 316 and then galvano- lated via the mirror 317 and the mirror 318. Incident on the mirror 319.
- a servo light component is generated in addition to a normal reproduction light component.
- p-polarized light is a component of light for reproduction
- s-polarized light is a component of light for servo.
- the polarization separating element 327 such as a Wollaston prism separates the angles of the p-polarized light and the s-polarized light in the multiple directions by a desired angle.
- the wave plate 326 is set at an angle that does not change the polarization direction.
- the mirror 318 corrects the multiplex and vertical angle of the reference light during reproduction by changing the angle between the multiplex and the vertical direction by, for example, an actuator 332. Since the angle of the galvanometer mirror 319 can be adjusted by the actuator 320, the incident angle of the reference light incident on the optical information recording medium 1 after passing through the lens 321 and the lens 322 can be set to a desired angle.
- the reference light angle is, for example, a reference light within a plane in which at least two or more reference lights whose angles are changed by the actuator 320 exist with the direction perpendicular to the optical information recording medium as 0 degrees as shown in the figure.
- the direction in which the angle scanning range is large is defined as + direction, and the opposite direction is defined as-direction.
- the signal light and the reference light are incident on the optical information recording medium 1 so as to overlap each other, whereby an interference fringe pattern is formed in the recording medium, and information is recorded by writing this pattern on the recording medium.
- the incident angle of the reference light incident on the optical information recording medium 1 can be changed by the galvanometer mirror 319, recording by angle multiplexing is possible.
- holograms corresponding to each reference beam angle are called pages, and a set of pages angle-multiplexed in the same area is called a book. .
- FIG. 3 shows a reproduction principle in an example of a basic optical system configuration of the pickup 11 in the optical information recording / reproducing apparatus 10.
- the reference light is incident on the optical information recording medium 1 and the light beam transmitted through the optical information recording medium 1 can be angle-adjusted by the actuator 323 and the galvanometer mirror 324 and the actuator 335. Is reflected by the galvanometer mirror 334 whose angle can be adjusted, thereby generating the reproduction reference light.
- the mirror angle of the galvanometer mirror 324 can be adjusted in the multiplexing direction, and the angle of the reference beam in the multiplexing direction is adjusted so that the reference beam is always perpendicularly incident on the galvanometer mirror 334.
- the galvano mirror 334 can adjust the mirror angle in the vertical direction with respect to the multiplexing, and adjusts the multiplexing of the reference light and the angle in the vertical direction so that the reference light always reflects vertically.
- the light reproduced downward by irradiation of the reference light from the upper surface of the disk before being reflected by the galvanometer mirror 324 is used for a control signal for controlling the multiplexing of the reference light and the angle in the vertical direction.
- the light reproduced downward is converted into parallel light by the lens 328, and p-polarized light and s-polarized light are separated by the PBS prism 329, and the respective lights are detected by the light detector 330 and the light detector 331.
- the s-polarized light and p-polarized light incident from the upper surface of the disk are irradiated in a state where they are intentionally shifted in opposite directions from the optimum angle for reproducing the hologram. Further, when the light is reflected by the galvanometer mirror 324, the angle is changed so as to be an optimum angle for reproducing the hologram. In order to reduce the size of the photodetector, it may be defocused as convergent light instead of parallel light and received by the photodetector.
- the reproduction light reproduced by the reproduction reference light propagates through the objective lens 315, the relay lens 313, and the spatial filter 314. Thereafter, the reproduction light passes through the PBS prism 311 and enters the photodetector 325, and the recorded signal can be reproduced.
- the photodetector 325 for example, an image sensor such as a CMOS image sensor or a CCD image sensor can be used. However, any element may be used as long as page data can be reproduced.
- FIG. 4 is a diagram showing another configuration of the pickup 11.
- the light beam emitted from the light source 501 passes through the collimator lens 502 and enters the shutter 503.
- the optical element 504 configured by, for example, a half-wave plate or the like adjusts the light quantity ratio of p-polarized light and s-polarized light to a desired ratio. After the polarization direction is controlled, the light enters the PBS prism 505.
- the light beam transmitted through the PBS prism 505 is incident on the spatial light modulator 508 via the PBS prism 507.
- the signal light 506 to which information is added by the spatial light modulator 508 is reflected by the PBS prism 507 and propagates through an angle filter 509 that passes only a light beam having a predetermined incident angle. Thereafter, the signal light beam is focused on the hologram recording medium 1 by the objective lens 510.
- the light beam reflected from the PBS prism 505 acts as reference light 512, and is set to a predetermined polarization direction according to recording or reproduction by the polarization direction conversion element 519, and then passed through the mirror 513 and the mirror 514 to be a lens. 515 is incident.
- the lens 515 plays a role of condensing the reference light 512 on the back focus surface of the objective lens 510, and the reference light once condensed on the back focus surface of the objective lens 510 becomes parallel light again by the objective lens 510.
- a servo light component is generated in addition to a normal reproduction light component.
- p-polarized light is a component of light for reproduction
- s-polarized light is a component of light for servo.
- the polarization separating element 327 such as a Wollaston prism separates the angles of the p-polarized light and the s-polarized light in the multiple directions by a desired angle.
- the wave plate 326 is set at an angle that does not change the polarization direction.
- the mirror 513 corrects the multiplex and vertical angle of the reference light during reproduction by changing the angle between the multiplex and the vertical direction by, for example, an actuator 332.
- the objective lens 510 or the optical block 521 can be driven, for example, in the direction indicated by reference numeral 520.
- the objective lens 510 and the objective lens can be driven. Since the relative positional relationship of the condensing points on the back focus surface 510 changes, the incident angle of the reference light incident on the hologram recording medium 1 can be set to a desired angle.
- the incident angle of the reference light may be set to a desired angle by driving the mirror 514 with an actuator.
- the reference beam When reproducing the recorded information, the reference beam is incident on the hologram recording medium 1 as described above, and the light beam transmitted through the hologram recording medium 1 is reflected by the galvanometer mirror 516 and the galvanometer mirror 523, thereby reproducing the recorded information.
- a reference beam is generated.
- the mirror angle of the galvanometer mirror 516 can be adjusted in the multiplexing direction, and the angle of the reference beam in the multiplexing direction is adjusted so that the reference beam is always perpendicularly incident on the galvanometer mirror 523.
- the galvano mirror 523 can adjust the mirror angle in the vertical direction with respect to the multiplexing, and adjusts the multiplexing of the reference light and the angle in the vertical direction so that the reference light is always vertically reflected.
- the light reproduced upward by the irradiation of the reference light from the lower surface of the disk before being reflected by the galvanometer mirror 516 is used as a control signal for controlling the multiplexing of the reference light and the angle in the vertical direction.
- the regenerated light is converted into parallel light by the lens 328, and p-polarized light and s-polarized light are separated by the PBS prism 329, and each light is detected by the light detector 330 and the light detector 331.
- the s-polarized light and p-polarized light incident from the lower surface of the disk are irradiated in a state where they are intentionally shifted in opposite directions from the optimum angle for reproducing the hologram.
- the angle is changed so as to be an optimum angle for reproducing the hologram.
- it may be defocused as convergent light instead of parallel light and received by the photodetector.
- the reproduction light reproduced by the reproduction reference light propagates through the objective lens 510 and the angle filter 509. Thereafter, the reproduction light passes through the PBS prism 507 and enters the photodetector 518, and the recorded signal can be reproduced.
- the optical system shown in FIG. 4 has the advantage that the signal light and the reference light are made incident on the same objective lens, so that the optical system can be greatly reduced in size as compared with the optical system configuration shown in FIG.
- FIG. 5 shows an operation flow of recording and reproduction in the optical information recording / reproducing apparatus 10.
- a flow relating to recording / reproduction using holography in particular will be described.
- FIG. 5A shows an operation flow from when the optical information recording medium 1 is inserted into the optical information recording / reproducing apparatus 10 until preparation for recording or reproduction is completed
- FIG. FIG. 5C shows an operation flow until information is recorded on the information recording medium 1
- FIG. 5C shows an operation flow until the information recorded on the optical information recording medium 1 is reproduced from the ready state.
- the optical information recording / reproducing apparatus 10 discriminates whether or not the inserted medium is a medium for recording or reproducing digital information using holography, for example. (602).
- the optical information recording / reproducing apparatus 10 reads control data provided on the optical information recording medium (603). ), For example, information relating to the optical information recording medium and information relating to various setting conditions during recording and reproduction, for example.
- the operation flow from the ready state to recording information is as follows. First, data to be recorded is received (611), and the information corresponding to the data is stored in the spatial light modulator in the pickup 11. To send.
- the access control circuit 81 is controlled to position the pickup 11 and the cure optical system 13 at predetermined positions on the optical information recording medium.
- the optical information recording medium 1 has address information, it reproduces the address information, checks whether it is positioned at the target position, and calculates the amount of deviation from the predetermined position if it is not positioned at the target position. And repeat the positioning operation.
- a predetermined region is pre-cured using the light beam emitted from the cure optical system 13 (614), and data is recorded using the reference light and signal light emitted from the pickup 11 (615).
- post cure is performed using the light beam emitted from the cure optical system 13 (616). Data may be verified as necessary.
- the operation flow from the ready state to the reproduction of recorded information is as follows.
- the access control circuit 81 is controlled and the pickup 11 and the reproduction reference light are reproduced.
- the position of the optical system 12 is positioned at a predetermined position on the optical information recording medium.
- the optical information recording medium 1 has address information, it reproduces the address information, checks whether it is positioned at the target position, and calculates the amount of deviation from the predetermined position if it is not positioned at the target position. And repeat the positioning operation.
- FIG. 8 shows a data processing flow at the time of recording and reproduction.
- FIG. 8A shows the input / output control circuit 90 after receiving the recording data 611 and converting it into two-dimensional data on the spatial light modulator 312.
- FIG. 8B shows a recording data processing flow in the signal generation circuit 86 until the signal processing is performed. After the two-dimensional data is detected by the photodetector 325, the signal processing from the input / output control circuit 90 to the reproduction data transmission 624 is shown. The reproduction data processing flow in the circuit 85 is shown.
- each data string is converted to CRC (902) so that error detection at the time of reproduction can be performed.
- the data string is scrambled (903) to add a pseudo random number data sequence, and then error correction coding (904) such as Reed-Solomon code is performed so that error correction can be performed during reproduction.
- error correction coding such as Reed-Solomon code is performed so that error correction can be performed during reproduction.
- the data string is converted into M ⁇ N two-dimensional data, and the two-dimensional data (905) for one page is configured by repeating the data for one page data.
- a marker serving as a reference for image position detection and image distortion correction at the time of reproduction is added to the two-dimensional data thus configured (906), and the data is transferred to the spatial light modulator 312 (907).
- the image data detected by the photodetector 325 is transferred to the signal processing circuit 85 (911).
- Image position is detected based on the marker included in the image data (912), distortion such as image tilt, magnification, distortion, etc. is corrected (913), and then binarization processing (914) is performed to remove the marker. (915) to acquire (916) two-dimensional data for one page.
- error correction processing (917) is performed to remove the parity data strings.
- descrambling processing (918) is performed, CRC error detection processing (919) is performed and CRC parity is deleted, and then user data is transmitted (920) via the input / output control circuit 90.
- FIG. 6 is a block diagram of the signal generation circuit 86 of the optical information recording / reproducing apparatus 10.
- the input / output control circuit 90 When the input of user data to the output control circuit 90 is started, the input / output control circuit 90 notifies the controller 89 that the input of user data has started. In response to this notification, the controller 89 instructs the signal generation circuit 86 to record data for one page input from the input / output control circuit 90. A processing command from the controller 89 is notified to the sub-controller 701 in the signal generation circuit 86 via the control line 708. Upon receiving this notification, the sub-controller 701 controls each signal processing circuit via the control line 708 so that the signal processing circuits are operated in parallel. First, the memory control circuit 703 is controlled to store user data input from the input / output control circuit 90 via the data line 709 in the memory 702.
- the CRC calculation circuit 704 performs control to convert the user data into CRC.
- the scramble circuit 705 scrambles the CRC-converted data to add a pseudo-random data sequence
- the error correction encoding circuit 706 performs error correction encoding to add the parity data sequence.
- the pickup interface circuit 707 reads out the error correction encoded data from the memory 702 in the order of the two-dimensional data on the spatial light modulator 312 and adds a reference marker at the time of reproduction. The two-dimensional data is transferred to the spatial light modulator 312.
- FIG. 7 is a block diagram of the signal processing circuit 85 of the optical information recording / reproducing apparatus 10.
- the controller 89 instructs the signal processing circuit 85 to reproduce the data for one page input from the pickup 11.
- a processing command from the controller 89 is notified to the sub-controller 801 in the signal processing circuit 85 via the control line 811.
- the sub-controller 801 controls each signal processing circuit via the control line 811 so that the signal processing circuits are operated in parallel.
- the memory control circuit 803 is controlled to store the image data input from the pickup 11 via the pickup interface circuit 810 via the data line 812 in the memory 802.
- the image position detection circuit 809 performs control to detect a marker from the image data stored in the memory 802 and extract an effective data range.
- the image distortion correction circuit 808 performs distortion correction such as image inclination, magnification, and distortion by using the detected marker, and controls to convert the image data into the expected two-dimensional data size.
- Each bit data of a plurality of bits constituting the size-converted two-dimensional data is binarized by the binarization circuit 807 to determine “0” or “1”, and the data is arranged on the memory 802 in the order of the output of the reproduction data. Control to store.
- the error correction circuit 806 corrects the error included in each data string
- the scramble release circuit 805 releases the scramble to add the pseudo random number data string
- the CRC calculation circuit 804 causes an error in the user data on the memory 802. Check not included. Thereafter, user data is transferred from the memory 802 to the input / output control circuit 90.
- FIG. 9 is a diagram showing a layer structure of an optical information recording medium having a reflective layer. (1) shows a state where information is recorded on the optical information recording medium, and (2) shows a state where information is reproduced from the optical information recording medium.
- the optical information recording medium 1 includes a transparent cover layer 1000, a recording layer 1002, a light absorption / light transmission layer 1006, a light reflection layer 1010, and a third transparent protective layer 1012 from the optical pickup 11 side.
- the interference pattern between the reference light 10A and the signal light 10B is recorded on the recording layer 1002.
- the light absorption / transmission layer 1006 absorbs the reference light 10A and the signal light 10B at the time of information recording, and the physical properties are converted so as to transmit the reference light at the time of information reproduction. For example, when the voltage is applied to the optical recording medium 1, the coloring / decoloring state of the light absorption / light transmission layer 1006 changes, that is, the light absorption / light transmission layer 1006 becomes colored during information recording.
- the reference light 10A and the signal light 10B that have passed through the layer 1002 are absorbed, and when the information is reproduced, the reference light is transmitted (T. Ando et. Al .: Technical Digest ISOM (2006), Th-PP). -10).
- the reference light 10A that has passed through the light absorption / light transmission layer 1006 is reflected by the light reflection layer 1010 to become reproduction reference light 10C.
- EC electrochromic
- this material When a voltage is applied to this material, it is reversibly colored and decolored, colored during information recording to absorb light, and decolored during information reproduction to transmit light.
- the configuration shown in FIG. 9 eliminates the need for a reproduction reference beam optical system, and allows the drive to be miniaturized.
- FIG. 10 is a schematic diagram showing an embodiment of an optical information recording medium and a book case.
- FIG. 10A shows a schematic diagram of an embodiment of an optical information recording medium.
- tracks 3 are arranged concentrically, for example, and a book case 2 is recorded on the tracks.
- the book case is the smallest unit that can be recorded during a recording session, and is composed of a plurality of books. For example, as shown in the drawing, a gap is provided between the book cases.
- the bookcase is recorded clockwise from the inner circumference side track.
- recording is performed by unifying the rotation angle position of the optical information recording medium.
- the recording start position of each track is shown by a straight line of 0 °.
- FIG. 10 (b) shows a schematic diagram of an embodiment of a book case.
- the book case 2 is composed of, for example, a plurality of books 4 and a management area 5.
- the management area includes, for example, information on the optical information recording medium, information on the optical information recording / reproducing apparatus that performed recording and reproduction, various setting conditions for recording and reproduction, environmental information such as temperature, humidity, date and time at the time of recording and reproduction.
- so-called management information such as information on physical addresses and logical addresses, information on media formats, information on defect positions and information on alternative areas is recorded, and is not used for recording user data.
- This management area is arranged, for example, at the right end of the outermost peripheral side in the book case. In the reproduction operation, for example, the management area is first searched and reproduced.
- FIG. 11 is a schematic diagram showing an example of the relationship between the locations of recorded and unrecorded areas and the amount of light detected during scanning.
- FIG. 11A shows a recorded area and an unrecorded area in the optical information recording medium in the optical information recording medium. It is assumed that there is a recorded area concentrically from the inner circumference to the outer circumference of the optical information recording medium, and the outermost circumference of the recorded area is recorded in the middle of the rotation angle.
- FIG. 11B shows the light quantity obtained when the outermost circumference of the recorded area is determined by scanning the light quantity in the radial direction after shifting the reference light angle in the direction perpendicular to the angle multiplexing.
- FIG. 11C shows the light amount obtained when the end of the recorded area is determined by scanning the light amount in the rotation direction.
- a light quantity larger than the threshold value is always detected, and a light quantity peak is obtained every time the book passes.
- the amount of light is equal to or less than the threshold value.
- the boundary between the recorded area and the unrecorded area can be stably detected by scanning the light amount by shifting the reference light angle in the direction perpendicular to the angle multiplexing, and management is possible. A search for an area becomes possible.
- FIG. 12 is a schematic diagram showing an example of the book recording order in the book case in the optical information recording / reproducing apparatus.
- recording is performed for each track indicated by Tr1 or Tr2, and when a certain track is recorded, the recording is moved to the next track and recording is performed.
- the track for example, an odd-numbered track indicated by Tr1 is recorded first, and then an even-numbered track indicated by Tr2 is recorded.
- Tr2 the recording portion of the optical information recording medium tends to contract due to recording, and the contraction state of the adjacent track is made uniform for recording. That is, by recording Tr2 after recording Tr1, both the inner and outer adjacent tracks can be recorded in an uncontracted state during Tr1 recording, and both the inner and outer adjacent tracks can be recorded during Tr2 recording.
- L1 is called, for example, layer 1
- L2 is called, for example, layer 2.
- This technique is called layer recording, for example.
- FIG. 13 is a schematic view showing an embodiment of a photodetector in the optical information recording / reproducing apparatus.
- the photodetector 330 or 331 is divided into, for example, two in the multiplex and vertical directions, and the received light signals are A, B, C, and D, respectively.
- the multiplexing of the reference light and the error signal in the vertical direction are expressed by the following equation, for example.
- Multiple vertical angle error signal (AB) / (A + B)-(CD) / (C + D) (Equation 1) Note that the number and arrangement of the light receiving surfaces of the photodetector are not limited to those shown in the drawing, and may be divided into two or more. In that case, a multiple vertical angle error signal can be generated by obtaining the luminance centroid of the signal on the light receiving surface.
- FIG. 14 is a diagram showing an example of a simulation result of a reproduction page at the time of applying the reference beam multiplex vertical angle shift and the reference beam multiplex direction angle shift.
- an angle shift in the multiplex vertical direction occurs, and the luminance centroid of the reproduction page is displaced vertically (in the multiplex and vertical directions).
- the direction of the displacement is reversed depending on the direction in which the offset of the angular deviation in the multiplex direction is added, the difference between the center of gravity position when the offset is added in the ⁇ direction and the offset in the + direction is calculated. Multiple angular error signals in the vertical direction can be generated.
- FIG. 15 is a diagram showing a simulation result of the reference light multiplexed vertical angle error signal. This result is a result of creating an error signal by simulation using Equation 1, but it is an S-shaped signal in which the error signal changes according to the amount of angular deviation in the multiplex and the vertical direction. It can be seen that can be created.
- FIG. 16 is a diagram showing an example of a learning operation flow of the photodetector mounting error amount.
- the position of the luminance gravity center of the reproduction page does not change even if the angle shift in the multiplexing direction occurs.
- the installation error of the photodetector is learned.
- the reference light angle is positioned so that the SNR is maximized by 601.
- the page is reproduced while changing the reference light angle, and the reference light angle is positioned by searching for the reference light angle that maximizes the SNR at that time.
- the luminance gravity center position of the reproduction page on the photodetector is calculated.
- the luminance barycentric position can be calculated by, for example, the formula (AB) / (A + B) or (CD) / (C + D).
- the mounting error of the photodetector is calculated.
- the signal calculation formula is corrected by the mounting error of each photodetector.
- FIGS. 1-10 A second embodiment of the present invention will be described with reference to FIGS.
- the apparatus configuration can be realized with the same configuration as that of the first embodiment, and thus the description thereof is omitted.
- FIG. 17 is a schematic view showing an embodiment of a photodetector in the optical information recording / reproducing apparatus.
- the photodetector 330 or 331 is divided into, for example, two in the multiplexing direction, and the received light signals are E, F, G, and H, respectively.
- the wavelength error signal is expressed by the following equation, for example.
- Wavelength error signal (E ⁇ F) / (E + F) ⁇ (GH) / (G + H) (Equation 3) Note that the number and arrangement of the light receiving surfaces of the photodetector are not limited to those shown in the drawing, and may be divided into two or more. In that case, a multiple vertical angle error signal can be generated by obtaining the luminance centroid of the signal on the light receiving surface.
- FIG. 18 is a diagram showing an example of a reproduction page when a wavelength shift and an angle shift in the reference light multiplexing direction are applied. If there is an amount of angular deviation in the multiplex direction, the luminance centroid of the reproduction page is displaced left and right (in the multiplex direction) due to the occurrence of wavelength deviation. In addition, since the magnitude of the displacement direction changes depending on the direction in which the offset of the angular deviation in the multiplex direction is applied, the difference between the center of gravity position when the offset is added in the ⁇ direction and the offset in the + direction is calculated. Multiple angular error signals in the vertical direction can be generated.
- FIG. 19 is a diagram showing a simulation result of the wavelength error signal. This result is a result of creating an error signal by simulation using Equation 3, but it is an S-shaped signal in which the error signal changes according to the amount of wavelength shift, and the error signal can be created by the present invention. I understand that.
- the reproduction page misalignment that occurs on the photodetector is the luminance center of gravity of the photodetector 330 and the photodetector 331. Since the difference is taken, there is an advantage that it is canceled out and the control signal is strong against disc displacement.
- a third embodiment of the present invention will be described with reference to FIG.
- the apparatus configuration can be realized with the same configuration as that of the first embodiment, and thus the description thereof is omitted.
- FIG. 20 is a schematic view showing an embodiment of a pickup in the optical information recording / reproducing apparatus.
- the difference from the optical system of Example 1 is that a lens 333 is added. After collimated light by the lens 328, it is converged by the lens 333. Thereafter, the light is defocused from the condensing point by the light detector 330 and the light detector 331, and is detected in the state of divergent light or convergent light.
- the method of this embodiment has an advantage that the photodetector can be downsized by adjusting the defocus amount to detect convergent light or divergent light instead of parallel light.
- a fourth embodiment of the present invention will be described with reference to FIG.
- the apparatus configuration can be realized with the same configuration as that of the first embodiment, and thus the description thereof is omitted.
- FIG. 21 is a schematic view showing an embodiment of a pickup in the optical information recording / reproducing apparatus.
- the photodetector 330 is not provided.
- the angle in the multiplexing direction of the reproducing p-polarized light incident from the upper surface of the disk is the optimum angle, and the angle in the multiplexing direction of the servo s-polarized light is offset from the optimum angle.
- the galvanometer mirror 324 reproduces the page at an optimum angle by vertically reflecting the p-polarized light for reproduction.
- the vertical angle error signal and the wavelength error signal are represented by the following formulas, for example.
- this invention is not limited to the above-mentioned Example, Various modifications are included.
- the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.
- a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.
- each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit.
- Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor.
- Information such as programs, tables, and files that realize each function can be stored in a memory, a hard disk, a recording device such as an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.
- control lines and information lines indicate what is considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.
- Multiple vertical angle corrector control signal generation circuit 93 ... Multiple vertical angle corrector drive circuit, 301 ... light source 302 ... collimating lens 303 ... shutter 304 ... 1/2 wavelength plate 305 ... polarization beam splitter 306 ... signal light 307 ... reference light , 308 ... Beam expander, 309 ... Phase mask 310 ... relay lens, 311 ... PBS prism, 312 ... Spatial light modulator, 313 ... Relay lens, 314 ... Spatial filter, 315 ... objective lens, 316 ... polarization direction conversion element, 317 ... mirror, 318 ... mirror, 319 ... mirror, 320 ... actuator, 321 ... lens, 322 ... lens, 323 ...
- actuator 324 ... Mirror, 325 ... Photodetector, 326 ... Wave plate, 327 ... Polarization separation element, 328 ... lens, 329 ... PBS prism, 330 ... photodetector, 331 ... photodetector, 332 ... Actuator, 333 ... Lens, 334 ... Galvano mirror, 335 ... Actuator, 501 ... light source, 502 ... collimating lens, 503 ... shutter, 504 ... optical element, 505 ... PBS prism, 506 ... signal light, 507 ... PBS prism, 508 ... Spatial light modulator, 509 ... Angle filter, 510 ... Objective lens, 511 ...
- Objective lens actuator 512: reference beam, 513: mirror, 514 ... mirror, 515 ... lens, 516 ... Galvano mirror, 517 ... Actuator, 518 ... Photo detector, 519: Polarization direction conversion element, 520: Driving direction, 521: Optical block, 522 ... Photodetector, 523 ... Galvano mirror, 524 ... Actuator
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Abstract
Description
なお、光検出器の受光面の分割数及び配置は本図面に限定されるものではなく、2分割以上していても構わない。その場合は、受光面上の信号の輝度重心を求めることで多重垂直方向角度誤差信号を生成することができる。
本実施例の方法では、再生時にラジアル方向にディスクの位置ずれが生じた場合に、光検出器上に生じる再生ページの位置ずれが、光検出器330と光検出器331での輝度重心の差分を取るため打ち消され、制御信号がディスク位置ずれに強いという利点がある。
なお、光検出器の受光面の分割数及び配置は本図面に限定されるものではなく、2分割以上していても構わない。その場合は、受光面上の信号の輝度重心を求めることで多重垂直方向角度誤差信号を生成することができる。
波長誤差信号=(G-H)/(G+H)・・・(式5)
本実施例の方法では、光検出器が1つであるため少ない部品点数で実現可能という利点がある。
4・・・ブック、5・・・管理領域
10・・・光情報記録再生装置、11・・・ピックアップ、
12・・・再生用参照光光学系、13・・・ディスクCure光学系、
14・・・ディスク回転角度検出用光学系、81・・・アクセス制御回路、
82・・・光源駆動回路、83・・・サーボ信号生成回路、
84・・・サーボ制御回路、85・・・信号処理回路、86・・・信号生成回路、
87・・・シャッタ制御回路、88・・・ディスク回転モータ制御回路、
89・・・コントローラ、90…入出力制御回路、91・・・外部制御装置、
92・・・多重垂直角度補正器制御信号生成回路、93・・・多重垂直角度補正器駆動回路、
301・・・光源、302・・・コリメートレンズ、303・・・シャッタ、304・・・1/2波長板、305・・・偏光ビームスプリッタ、306・・・信号光、307・・・参照光、
308・・・ビームエキスパンダ、309・・・フェーズ(位相)マスク、
310・・・リレーレンズ、311・・・PBSプリズム、
312・・・空間光変調器、313・・・リレーレンズ、314・・・空間フィルタ、
315・・・対物レンズ、316・・・偏光方向変換素子、317・・・ミラー、
318・・・ミラー、319・・・ミラー、320・・・アクチュエータ、
321・・・レンズ、322・・・レンズ、323・・・アクチュエータ、
324・・・ミラー、325・・・光検出器、326・・・波長板、327・・・偏光分離素子、
328・・・レンズ、329・・・PBSプリズム、330・・・光検出器、331・・・光検出器、
332・・・アクチュエータ、333・・・レンズ、
334・・・ガルバノミラー、335・・・アクチュエータ、
501・・・光源、502・・・コリメートレンズ、503・・・シャッタ、504・・・光学素子、
505・・・PBSプリズム、506・・・信号光、507・・・PBSプリズム、
508・・・空間光変調器、509・・・アングルフィルタ、510・・・対物レンズ、
511・・・対物レンズアクチュエータ、
512・・・参照光、513・・・ミラー、514・・・ミラー、515・・・レンズ、
516・・・ガルバノミラー、517・・・アクチュエータ、518・・・光検出器、
519・・・偏光方向変換素子、520・・・駆動方向、521・・・光学ブロック、
522・・・光検出器、523・・・ガルバノミラー、524・・・アクチュエータ
Claims (15)
- ホログラフィを利用して光情報記録媒体から情報を再生する光情報再生装置において、
参照光を生成するレーザ光源と、
前記参照光の多重方向の角度を調節する多重角度調節素子と、
前記参照光の多重と垂直方向の角度を調節する垂直角度調節素子と、
前記光情報記録媒体から再生する回折光を検出する撮像素子と、
前記参照光を多重方向の角度が異なる少なくとも2つの参照光に分岐する光軸分岐素子と、
前記分岐された参照光を多重方向の角度を最適角度からずらした状態で前記光情報記録媒体に照射し再生された回折光を検出する少なくとも2つ以上の受光面を有する光検出部と、を備えることを特徴とする光情報再生装置。 - 請求項1記載の光情報再生装置において、
前記光検出部で検出した信号から参照光の多重と垂直方向の角度誤差信号を生成する角度誤差信号算出回路と、を備え、
前記垂直角度調整部は、前記角度誤差信号算出回路から出力される信号に基づき参照光の多重と垂直方向の角度を調整することを特徴とする光情報再生装置。 - 請求項2に記載の光情報再生装置において、
前記角度誤差信号算出回路は光検出部上の回折光の輝度重心位置を基に参照光の多重と垂直方向の角度誤差信号を生成することを特徴とする光情報再生装置。 - 請求項2に記載の光情報再生装置において、
前記角度誤差信号算出回路は光検出部の取付誤差量を学習し、該取付誤差量から多重と垂直方向の角度誤差信号の算出式を補正したうえで該角度誤差信号を生成することを特徴とする光情報再生装置。 - 請求項2に記載の光情報再生装置において、
前記光検出部は、参照光の多重方向の角度を最適角度からプラス方向にずらした状態で再生した信号を検出するための光検出器1と参照光の多重方向の角度を最適角度からマイナス方向にずらした状態で再生した信号を検出するための検出器2とで構成されることを特徴とする光情報再生装置。 - 請求項5に記載の光情報再生装置において、
前記角度誤差信号算出回路は前記光検出器1上の回折光の輝度重心位置と前記光検出器2上の回折光の輝度重心位置の差分の情報を基に参照光の多重と垂直方向の角度誤差信号を生成することを特徴とする光情報再生装置。 - 請求項1記載の光情報再生装置において、
前記光検出部で検出した信号から波長誤差信号を生成する波長誤差信号算出回路と、を備え、
前記光源は、前記波長誤差信号算出回路から出力される信号に基づき波長を調整することを特徴とする光情報再生装置。 - 請求項7に記載の光情報再生装置において、
前記波長誤差信号算出回路は光検出部上の回折光の輝度重心位置を基に波長誤差信号を生成することを特徴とする光情報再生装置。 - 請求項7に記載の光情報再生装置において、
前記波長誤差信号算出回路は光検出部の取付誤差量を学習し、該取付誤差量から波長誤差信号の算出式を補正したうえで該波長誤差信号を生成することを特徴とする光情報再生装置。 - 請求項7に記載の光情報再生装置において、
前記光検出部は、参照光の多重方向の角度を最適角度からプラス方向にずらした状態で再生した信号を検出するための光検出器1と参照光の多重方向の角度を最適角度からマイナス方向にずらした状態で再生した信号を検出するための検出器2とで構成されることを特徴とする光情報再生装置。 - 請求項10に記載の光情報再生装置において、
前記波長誤差信号算出回路は前記光検出器1上の回折光の輝度重心位置と前記光検出器2上の回折光の輝度重心位置の差分の情報を基に波長誤差信号を生成することを特徴とする光情報再生装置。 - ホログラフィを利用して光情報記録媒体から情報を再生する光情報再生方法において、
参照光を生成するレーザ出射工程と、
前記参照光を多重方向の角度が異なる少なくとも2つの参照光に分岐する光軸分岐工程と、
前記参照光の多重方向の角度を調節する多重角度調節工程と、
前記参照光の多重と垂直方向の角度を調節する垂直角度調節工程と、
前記光情報記録媒体から再生する回折光を検出する撮像工程と、
参照光を多重方向の角度を最適角度からずらした状態で前記光情報記録媒体に照射し再生された回折光を検出する少なくとも2つ以上の受光面を有する光検出部で検出する検出工程と、
前記光検出部で検出した信号から参照光の多重と垂直方向の角度誤差信号を生成する角度誤差信号算出工程と、を備え、
前記垂直角度調整工程は、前記角度誤差信号算出工程から出力される信号に基づき参照光の多重と垂直方向の角度を調整することを特徴とする光情報再生方法。 - 請求項12に記載の光情報再生方法において、
前記角度誤差信号算出工程は光検出部上の回折光の輝度重心位置を基に参照光の多重と垂直方向の角度誤差信号を生成することを特徴とする光情報再生方法。 - ホログラフィを利用して光情報記録媒体から情報を再生する光情報再生方法において、
参照光を生成するレーザ出射工程と、
前記参照光を多重方向の角度が異なる少なくとも2つの参照光に分岐する光軸分岐工程と、
前記参照光の多重方向の角度を調節する多重角度調節工程と、
前記光情報記録媒体から再生する回折光を検出する撮像工程と、
参照光を多重方向の角度を最適角度からずらした状態で前記光情報記録媒体に照射し再生された回折光を検出する少なくとも2つ以上の受光面を有する光検出部で検出する検出工程と、
前記光検出部で検出した信号から波長誤差信号を生成する波長誤差信号算出工程と、を備え、
前記出射工程は、前記波長誤差信号算出工程から出力される信号に基づき波長を調整することを特徴とする光情報再生方法。 - 請求項14に記載の光情報再生方法において、
前記波長誤差信号算出工程は光検出部上の回折光の輝度重心位置を基に波長誤差信号を生成することを特徴とする光情報再生方法。
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