WO2015011744A1 - Dispositif d'enregistrement optique d'informations, dispositif de lecture optique d'informations, procédé d'enregistrement optique d'informations et procédé de détection de défaut d'alignement de position de lecture - Google Patents

Dispositif d'enregistrement optique d'informations, dispositif de lecture optique d'informations, procédé d'enregistrement optique d'informations et procédé de détection de défaut d'alignement de position de lecture Download PDF

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Publication number
WO2015011744A1
WO2015011744A1 PCT/JP2013/069729 JP2013069729W WO2015011744A1 WO 2015011744 A1 WO2015011744 A1 WO 2015011744A1 JP 2013069729 W JP2013069729 W JP 2013069729W WO 2015011744 A1 WO2015011744 A1 WO 2015011744A1
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WO
WIPO (PCT)
Prior art keywords
optical information
page data
information recording
light
recording medium
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PCT/JP2013/069729
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English (en)
Japanese (ja)
Inventor
孝一郎 西村
利樹 石井
直仁 池田
悠介 中村
達朗 井手
Original Assignee
日立コンシューマエレクトロニクス株式会社
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Priority to PCT/JP2013/069729 priority Critical patent/WO2015011744A1/fr
Publication of WO2015011744A1 publication Critical patent/WO2015011744A1/fr

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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
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/128—Modulators

Definitions

  • the present invention relates to an apparatus and method for recording information on a recording medium using holography, and an apparatus and method for reproducing information recorded on the recording medium using holography.
  • the Blu-ray Disc (TM) standard using a blue-violet semiconductor laser has made it possible to commercialize an optical disc having a recording capacity of about 50 GB even for consumer use.
  • HDD Hard Disk Drive
  • Hologram recording technology is a method in which signal light having page data information two-dimensionally modulated by a spatial light modulator is superimposed on reference light inside the recording medium, and the interference fringe pattern generated at that time is placed in the recording medium. This is a technique for recording information on a recording medium by causing refractive index modulation.
  • the hologram recorded in the recording medium acts like a diffraction grating to generate diffracted light. This diffracted light is reproduced as the same light including the recorded signal light and phase information.
  • Regenerated signal light is detected two-dimensionally at high speed using a photodetector such as a CMOS or CCD.
  • a photodetector such as a CMOS or CCD.
  • the hologram recording technique enables two-dimensional information to be recorded on the optical recording medium at once by one hologram and further reproduces this information. Since the page data can be overwritten, large-capacity and high-speed information recording / reproduction can be achieved.
  • Patent Document 1 JP-A-2004-272268
  • a signal beam is condensed on an optical information recording medium by a lens, and simultaneously, a hologram is recorded by irradiating and collimating a reference beam of a parallel beam, and further determining the incident angle of the reference beam on the optical recording medium.
  • a so-called angle multiplex recording method is described in which multiplex recording is performed by displaying different page data on a spatial light modulator while changing.
  • Patent Document 2 describes that “a holographic memory device capable of controlling the reproduction light emitted from the hologram to be reproduced appropriately to pass through the polytopic filter” is provided. Has been.
  • the number of page data to be angle-multiplexed (the number of multiplexing) is increased by using the methods described in Patent Documents 1 and 2, and at the same time, the page data that has been multiplexed and recorded (Hereinafter referred to as a book) needs to be spread more densely on the medium.
  • an object of the present invention is to provide an optical information recording apparatus, an optical information reproducing apparatus, an optical information recording method, and a reproducing position deviation capable of detecting a reproducing position deviation over a wide range when reproducing information recorded on a hologram recording medium. It is to provide a detection method.
  • an optical information recording apparatus an optical information reproducing apparatus, an optical information recording method, and a reproduction positional deviation detection method capable of detecting a reproduction positional deviation over a wide range when reproducing information recorded on a hologram recording medium.
  • Schematic showing page image data for detecting a reproduction position shift of an optical information recording / reproducing apparatus 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 the operation flow of the optical information recording / reproducing apparatus Schematic showing an embodiment of the operation flow of the 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 an embodiment of the operation flow of the signal generation circuit Schematic showing an embodiment of the operation flow of the signal processing circuit Schematic showing a reproduced image for detecting a reproduction position shift of the optical information recording / reproducing apparatus.
  • Schematic showing the relationship between the playback position of the optical information recording and playback device and the brightness of the playback image partial area Schematic showing page image data for detecting a reproduction position shift of an optical information recording / reproducing apparatus
  • Schematic showing a reproduced image for detecting a reproduction position shift of the optical information recording / reproducing apparatus Schematic showing page image data for detecting a reproduction position shift of an optical information recording / reproducing apparatus
  • Schematic showing a reproduced image for detecting a reproduction position shift of the optical information recording / reproducing apparatus Schematic showing a reproduced image for detecting a reproduction position shift of the optical information recording / reproducing apparatus.
  • FIG. 1 which shows the simulation result of the reproduction
  • Schematic showing a reproduced image for detecting a reproduction position shift of the optical information recording / reproducing apparatus Schematic diagram showing an example of the operation flow
  • FIG. 2 is a block diagram showing a recording / reproducing apparatus of an optical information recording medium for recording and / or reproducing 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 irradiating the optical information recording medium 1 with reference light and signal light 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 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. Further, 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.
  • the reproduction image increase contrast detection circuit 201 is a circuit that detects contrast information from a camera image obtained from the pickup 11, and the detected reproduction position information is input to the controller 89, and reproduction position information described later is generated. Control information necessary for the servo control circuit 84, the access control circuit 81, and the like is developed based on the generated reproduction position information.
  • a method is generally used in which a threshold value is obtained from a luminance distribution of a reproduced image by any method to divide a pixel into two, and an average luminance difference between separated pixel sets is obtained. To get the threshold value, Calculations are based on the expected value of luminance and the variance value of the luminance distribution.
  • FIG. 3 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. 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. In order to set the incident angle of the reference light, an element that converts the wavefront of the reference light may be used instead of the galvanometer mirror.
  • 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. 4 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 as described above, and the light beam transmitted through the optical information recording medium 1 is reflected by the galvanometer mirror 324 whose angle can be adjusted by the actuator 323. By doing so, the reproduction reference light is generated.
  • 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. 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. (502).
  • the optical information recording / reproducing apparatus 10 reads control data provided on the optical information recording medium (503). ), 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 (511), and information corresponding to the data is received from the spatial light modulator in the pickup 11. Send to.
  • 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 area is pre-cured using the light beam emitted from the cure optical system 13 (514), and data is recorded using the reference light and signal light emitted from the pickup 11 (515).
  • post cure is performed using the light beam emitted from the cure optical system 13 (516). 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 during recording and reproduction.
  • FIG. 8A shows the two-dimensional data on the spatial light modulator 312 after the recording data reception processing 511 in the input / output control circuit 90.
  • FIG. 8B shows a recording data processing flow in the signal generation circuit 86 until conversion.
  • FIG. 8B shows the process up to the reproduction data transmission processing 524 in the input / output control circuit 90 after the two-dimensional data is detected by the photodetector 325.
  • the reproduction data processing flow in the signal processing circuit 85 is shown.
  • each data string is converted to CRC (802) so that error detection at the time of reproduction can be performed.
  • the data string is scrambled (803) to add a pseudo-random data string, and then error correction coding (804) such as Reed-Solomon code is performed so that error correction can be performed during reproduction.
  • error correction coding 804 such as Reed-Solomon code is performed so that error correction can be performed during reproduction.
  • this data string is converted into two-dimensional data of M ⁇ N, and the two-dimensional data (805) for one page is configured by repeating this data for one page of data.
  • a marker serving as a reference for image position detection and image distortion correction during reproduction is added to the two-dimensional data configured as described above (806), and the data is transferred to the spatial light modulator 312 (807).
  • Image data detected by the photodetector 325 is transferred to the signal processing circuit 85 (811).
  • Image position is detected based on the marker included in the image data (812), distortion such as image tilt, magnification, and distortion is corrected (813), and then binarization processing (814) is performed to remove the marker.
  • binarization processing 814
  • two-dimensional data for one page is acquired (816).
  • error correction processing 817
  • descrambling processing 818
  • CRC error detection processing (819) is performed
  • CRC CRC is deleted
  • user data is transmitted (820) 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 601 in the signal generation circuit 86 via the control line 608. Upon receiving this notification, the sub-controller 601 controls each signal processing circuit via the control line 608 so that each signal processing circuit operates in parallel. First, the memory control circuit 603 is controlled to store user data input from the input / output control circuit 90 via the data line 609 in the memory 602.
  • the CRC calculation circuit 604 performs control to convert the user data into CRC.
  • the CRC-converted data is scrambled by adding a pseudo-random data sequence by the scramble circuit 605, and the error correction encoding circuit 606 performs error correction encoding by adding the parity data sequence.
  • the pickup interface circuit 607 reads out the error correction encoded data from the memory 602 in the arrangement 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 701 in the signal processing circuit 85 via the control line 711.
  • the sub-controller 701 controls each signal processing circuit via the control line 711 so that the signal processing circuits are operated in parallel.
  • the memory control circuit 703 is controlled to store the image data input from the pickup 11 via the pickup interface circuit 710 via the data line 712 in the memory 702.
  • the image position detection circuit 709 performs control to detect a marker from the image data stored in the memory 702 and extract an effective data range.
  • the image distortion correction circuit 708 performs distortion correction such as image inclination, magnification, and distortion 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 707 to determine “0” or “1”, and the data is arranged on the memory 702 in the order of the output of the reproduction data Control to store.
  • the error correction circuit 706 corrects an error included in each data string, and the scramble release circuit 705 cancels the scramble to add the pseudo random number data string, and then the CRC calculation circuit 704 detects an error in the user data on the memory 702. Check not included. Thereafter, user data is transferred from the memory 702 to the input / output control circuit 90.
  • FIG. 9 is a diagram schematically showing the relationship between the recording position on the hologram surface (Fourier plane) on the disc of the book and the reproduction acquired image according to the reproduction position on the hologram surface.
  • Reference numerals 901 to 903 on the disk show hologram images on the disk in book recording.
  • the page data at each multiple angle in the book is recorded as a Fourier transformed image on the hologram surface. It is known that the bit rate of white and black that can secure the most multiplexed number by optimizing the disk consumption per page in hologram recording is 50% (half rate).
  • reference numerals 904 and 905 in the figure schematically show the irradiation position of the reference light on the hologram surface when the recorded information on the disc is reproduced.
  • Reference numeral 904 indicates a case where the reference light is accurately positioned at the book recording position
  • reference numeral 905 indicates a case where the reference light is positioned at a position deviated from the book recording position.
  • a mechanism for detecting a positional deviation of the reference light by providing a reproduction position detection page for recording at a predetermined reference light angle in an adjacent book and describing a special pattern on these pages. Indicates.
  • FIG. 1 shows page image data used for detecting the reproduction position in this embodiment.
  • 101 in the figure is page data for detecting a reproduction position (hereinafter referred to as servo page data 1) recorded on a page of a predetermined reference light angle (hereinafter referred to as servo page angle) of a predetermined book, Reproduction position detection page data (hereinafter referred to as servo page data 2) recorded on a page having the same reference beam angle as the servo page angle in a book adjacent to a predetermined book.
  • servo page data 1 and 2 has a bit inversion pattern in a minimum pixel unit of data (hereinafter referred to as a pixel pitch) and has a bit inversion relationship.
  • FIG. 9 shows a position detection method using the reproduced image using the page data 1 and 2 described above.
  • hologram images 901 and 903 are books including the page data 1 and are hereinafter referred to as a book 901 and a book 903.
  • the hologram image 902 is a book including the page data 2 and is hereinafter referred to as a book 902.
  • the reproduction position shows a reproduction image of the servo page angle when the reference light irradiation position (hereinafter referred to as the reproduction position) is accurately positioned at the position 904 in FIG. In this state, the reproduced image is the same as the page data 101 because it is not affected by the crosstalk from the adjacent book.
  • the playback image at the servo page angle is the sum of the playback images played back from the servo pages of book 902 and book 903.
  • the addition ratio is such that the reference light irradiation range overlaps with the books 902 and 903.
  • the reproduced image in this case is as indicated by 907 in the figure, and the contrast of the image is deteriorated as compared with 906.
  • the contrast of the reproduced image is detected by the reproduced image contrast detection circuit 201 in FIG.
  • FIG. 10 shows the relationship between the playback position and the contrast of the playback image.
  • the horizontal axis represents the playback position
  • the vertical axis represents the contrast of the playback image at the servo page angle
  • 1001 shows the relationship between the two in the present embodiment.
  • 1002 in FIG. 9 indicates the position of the book 901 in FIG. 9
  • 1003 indicates the position of the book 902 in FIG.
  • adjacent servo page patterns that are inversely related to the servo page pattern of the book are mixed in the playback image at the servo page angle, and each servo page pixel is mixed.
  • the brightness will be uniform.
  • the contrast changes as indicated by 1001 in FIG.
  • the amount of change may be, for example, the difference between the contrast when the reproduction position is accurately positioned at the book position and the detected contrast.
  • the contrast when the reproduction position is accurately positioned at the position of the book may be held in advance in the apparatus or the like.
  • the present invention is not limited to this.
  • FIG. 11 shows the measurement results of the experimental apparatus of this example, and the horizontal and vertical axes in the figure are the same as those in FIG. 1101 in the figure is a book recording position as a reproduction target, and it can be confirmed that the contrast 1102 decreases as the reproduction position deviates from 1101.
  • the optical information recording medium 1 is driven and the optical information recording medium 1 is mechanically positioned at a desired position (2602).
  • the incident angle of the reference light incident on the optical information recording medium 1 by the galvano mirror 319 is changed to the incident angle of the reference light on which the servo page is recorded (2603).
  • it is determined whether or not preparation for reading is completed is completed. If completed, servo page detection is performed (2605). If it is determined that the preparation for reading is not completed, the wavelength of the light source and the incident angle of the reference light are adjusted (2606). When the adjustment is completed, the servo page is detected (2605).
  • the processing time is shortened by the time that the data processing of the reproduction signal is not required, and the first book reproduction is started. Processing time can be shortened.
  • a black and white checkerboard pattern image and its bit-reversed image are used for the servo page pattern.
  • the servo page pattern uses data to secure the size of the hologram image on the disk. It is only necessary to secure the same minimum pixel unit as that of the page, and the data pattern is not limited to that of this embodiment.
  • the contrast detected by the reproduced image contrast detection circuit 201 may be a difference between the maximum luminance and the minimum luminance in the image.
  • the luminance in the image is divided into two by the predetermined luminance or the average luminance in the image. It may be a difference in average luminance.
  • the direction in which the reproduction position is shifted is determined according to whether the reproduction position is moved in the X direction or the ⁇ X direction and the contrast is increased or decreased. To do.
  • the present invention is not limited to this.
  • FIG. 23 shows the configuration of the recording / reproducing apparatus 10 for the optical information recording medium of the present embodiment.
  • FIG. 12 shows page image data used for reproduction position detection in this embodiment.
  • the page image data 1201 in the figure is recorded on a predetermined page of a predetermined book, and the page image data 1202 is recorded in a book adjacent to the book 1201 using the same reference light angle as the page image data 1201.
  • Reference numeral 1203 denotes a partial area for calculating contrast, which will be described later.
  • the same area 1203-a in the page image data 1201 and the same area 1203-b in the page image data 1202 indicate the same area. Data recorded in this area is bit-inverted data between page image data 1201 and page image data 1202.
  • the partial area 1203 is a known area. For example, the recording / reproducing apparatus 10 recognizes that the partial area 1203 is embedded in the area.
  • areas other than this area may be random bit patterns such as information data.
  • FIG. 13 shows a reproduction position detection method using a reproduction image using the page image data 1201 and the page image data 1202.
  • hologram images 1301 and 1303 are books including the page image data 1201, and these are hereinafter referred to as a book 1301 and a book 1303.
  • the hologram image 1302 is a book including the page image data 1202 and is hereinafter referred to as a book 1302.
  • the predetermined area 1308-a of the reproduced image corresponds to the area 1203-a described above, and in this state, the reproduced image in this area is not recorded in the area 1203-a because it is not affected by the crosstalk from the adjacent book. Same as data.
  • the playback image at the reference light angle of the page image data 1201 is the page image data 1202 played back from the book 1302.
  • the sum image of the page image data 1201 reproduced from the book 1303 is obtained, and the addition ratio is a ratio of the reproduction range and the books 1302 and 1303 overlapping.
  • the reproduced image in the same area as the area 1308-a becomes the area 1308-b in the figure, and the contrast of the image is deteriorated as compared with the area 1308-a.
  • the contrast of the reproduced image is detected by the reproduced image partial area contrast detection circuit 2301 shown in FIG.
  • the partial area is an image area of 2 ⁇ 2 pixels.
  • the size, shape, and arrangement position of the partial area are not limited to this embodiment.
  • a partial area with a fixed bit pattern is arranged in the data page.
  • this partial area can be arranged on any page included in the book, and the number of pages to be arranged is also limited. is not.
  • FIG. 24 shows the configuration of the recording / reproducing apparatus 10 for the optical information recording medium of the present embodiment.
  • FIG. 14 shows page image data used for detecting the reproduction position in the present embodiment.
  • 1401 in the figure is page data for reproduction position detection (hereinafter referred to as servo page data 1401) recorded on a page of a predetermined reference beam angle (similar to the servo page angle of the first embodiment) of a predetermined book.
  • Reference numeral 1402 denotes reproduction position detection page data (hereinafter referred to as servo page data 1402) recorded on a page having the same reference light angle as the servo page angle in a book adjacent to the predetermined book.
  • the page data 1401 includes a region where the average luminance of the predetermined region is known. In this embodiment, the bit zero region (black region) on the right side of the figure corresponds to this. It should be noted that the areas other than the area where the average luminance is known have the same bit pattern in which both the page data 1401 and 1402 have bit inversion in units of small pixels.
  • FIG. 15 shows a position detection method using a reproduced image using the page data 1401 and 1402.
  • hologram images 1501 and 1503 are books including the page data 1401 and are hereinafter referred to as a book 1501 and a book 1503.
  • the hologram image 1502 is a book including the page data 1402 and is hereinafter referred to as a book 1502.
  • the reproduced image is the same as the page data 1401 because it is not affected by the crosstalk from the adjacent book.
  • the average luminance of the partial area 1508-a where the luminance of the page data 1401 is known is calculated.
  • the average luminance is zero.
  • the playback image at the servo page angle is the sum of the playback images played back from the servo pages of book 1502 and book 1503.
  • the addition ratio is the ratio of the reference light irradiation range and the books 1502 and 1503 overlapping.
  • the luminance distribution of the same partial area 1508-b as the partial area 1508-a is larger than the average luminance of the partial area 1508-a described above because the luminance of the page data 1402 is added.
  • the average luminance of the partial area of the reproduced image is detected by the reproduced image predetermined area average luminance detecting circuit 2401 shown in FIG.
  • FIG. 16 shows the relationship between the playback position and the partial area average brightness of the playback image.
  • the horizontal axis represents the reproduction position
  • the vertical axis represents the partial area average luminance
  • 1601 represents the relationship between the two in this embodiment.
  • 1602 in FIG. 15 indicates the position of the book 1501 in FIG. 15, and 1603 indicates the position of the book 1502 in FIG.
  • the average brightness of the partial area changes from zero to the average brightness of the partial area of the page data 1402 included in the book 1502.
  • the deviation of the reproduction position may be detected using a threshold value of luminance.
  • the average luminance information of the partial area since the average luminance information of the partial area is used, it is not necessary to detect a threshold value for luminance separation required for contrast detection in the first and second embodiments of the present invention, and the arithmetic processing Can be simplified, and at the same time, it is more resistant to image degradation due to deviations in reproduction conditions.
  • the right side of the servo page data is the bit zero area (black area), but this ratio is not limited to this.
  • the entire servo page data area may be a bit zero area (black area).
  • the configuration of the recording / reproducing apparatus of the present embodiment and the optical system configuration are the same as those of the second embodiment of the present invention, and a description thereof will be omitted here.
  • FIG. 17 shows page image data used for reproduction position detection in this embodiment.
  • the page image data 1701 to 1703 in the figure are page image data recorded on a predetermined page of a predetermined book.
  • the partial area 1704 has the same pattern in the page image data 1701 (1704-a in the figure) and in the page image data 1702 (1704-b in the figure). The pattern is different from the inside (1704-c in the figure).
  • the partial area 1705 has the same pattern in the page image data 1702 (1705-b in the figure) and in the page image data 1703 (1705-c in the figure), and in the page image data 1701 (1705-a in the figure). Are different patterns.
  • FIG. 18 shows a playback position detection method using playback images using the page image data 1701 to 1703.
  • a holographic image 1801 is a book including the page image data 1701 and is hereinafter referred to as a book 1801.
  • the hologram image 1802 is a book including the page image data 1702 and is hereinafter referred to as a book 1802.
  • the hologram image 1803 is a book including the page image data 1703 and is hereinafter referred to as a book 1803.
  • the book 1801 and the book 1802 are adjacent to each other in the Y axis direction on the disk, and the book 1801 and the book 1802 are adjacent to each other in the X direction different from the Y axis direction on the disk.
  • the reproduced image 1806 is a sum image of page image data 1701 reproduced from the book 1801 and page image data 1702 reproduced from the book 1802.
  • the reproduced image in the same area 1808-a as the above-described area 1704 is the same in the page image data 1701 and 1702, and thus the reproduced image similar to the page image data is obtained.
  • the reproduced image in the area 1809-a which is the same as the area 1705 described above, is bit-inverted in the page image data 1701 and 1702, so that the contrast in the area is lowered.
  • a playback image at the reference light angle of the page image data 1702 is shown in 1807.
  • a reproduced image 1807 is a sum image of page image data 1702 reproduced from the book 1802 and page image data 1703 reproduced from the book 1803.
  • the reproduced image in the area 1808-b that is the same as the above-described area 1704 is bit-inverted in the page image data 1702 and 1703, so that the contrast in the area decreases.
  • the reproduced images in the region 1809-b that is the same as the region 1705 are the same in the page image data 1702 and 1703, a reproduced image similar to the page image data is obtained.
  • the partial area is an image area of 2 ⁇ 2 pixels.
  • the size, shape, and arrangement position of the partial area are not limited to this embodiment.
  • the arrangement and number of partial areas are not limited to the present embodiment.
  • the configuration of the recording / reproducing apparatus of the present embodiment and the optical system configuration are the same as those of the third embodiment of the present invention, and a description thereof will be omitted here.
  • FIG. 19 shows page image data used for reproduction position detection in this embodiment.
  • the page image data 1901 to 1903 in the figure is page image data recorded on a predetermined page of a predetermined book, and is an image having an area having a known average luminance at different locations or not having any at all.
  • the average brightness of the upper right portion of the page image data 1901 and the upper left portion of the page image data 1903 corresponds to a known region.
  • the page image data 1902 does not have an area with a known average luminance.
  • page image data 1901 to 1903 have the same bit pattern having bit inversion in the minimum pixel unit.
  • a checkered pattern is used.
  • FIG. 20 shows a method for detecting a reproduction position using a reproduction image using the page image data 1901 to 1903.
  • a holographic image 2001 is a book including the page image data 1901, which is hereinafter referred to as a book 2001.
  • the hologram image 2002 is a book including the page image data 1902 and is hereinafter referred to as a book 2002.
  • the hologram image 2003 is a book including the page image data 1903, which is hereinafter referred to as a book 2003.
  • the book 2001 and the book 2002 are adjacent to each other in the Y axis direction on the disc, and the book 2001 and the book 2002 are adjacent to each other in the X direction different from the Y axis direction on the disc.
  • a reproduced image 2006 is a sum image of page image data 1901 reproduced from the book 2001 and page image data 1902 reproduced from the book 2002.
  • a partial reproduction area 2008 is provided in an area where the average luminance of the page image data 1901 is known.
  • a partial reproduction area 2009 is provided in an area where the average luminance of the page image data 1903 is known.
  • the average brightness decreases due to the influence of the area where the average brightness of the page image data 1901 is known.
  • the partial playback area 2009-a in the playback image 2006 is an area where the page image data 1901 and 1902 are the same, the average luminance does not change.
  • the reproduced image 2007 is a sum image of page image data 1902 reproduced from the book 2002 and page image data 1903 reproduced from the book 2003.
  • the average luminance of the partial reproduction area 2008-b inside the reproduction image 2007 does not change in the same manner as the page image data 1902 and 1903, contrary to the above.
  • the average brightness of the partial playback area 2009-b in the playback image 2007 is reduced by the influence of the area where the average brightness of the page image data 1903 is known.
  • the third embodiment of the present invention is provided by providing areas of known average brightness at different positions in the pages of a book having different adjacent directions of the book and obtaining the average brightness of the area in the reproduced image. While obtaining the same effect, it is possible to detect not only the amount of deviation of the reproduction position from the target reproduction book but also the direction of deviation.
  • the configuration of the recording / reproducing apparatus of the present embodiment and the optical system configuration are the same as those of the second embodiment of the present invention, and a description thereof will be omitted here.
  • Information recording on a medium by a hologram is performed by forming a hologram (grating) by polymerization of monomers in the medium recording layer by irradiation with laser light.
  • the recording medium shrinks.
  • the hologram recording medium expands and contracts due to temperature changes. Because of these factors, the recorded hologram is distorted when information is recorded on the hologram medium using the angle multiplexing method and due to expansion and contraction of the medium due to a temperature change after recording. For this reason, when page data is reproduced under the same laser wavelength and reference light angle conditions as in recording, only a part of the reproduced image is reproduced.
  • FIG. 22 shows page image data used for reproduction position detection in this embodiment.
  • the page image data 2201 in the figure is page image data recorded on a predetermined page of a predetermined book, and the page image data 2202 is recorded in a book adjacent to the book 2201 using the same reference light angle as the page image data 2201.
  • Reference numeral 2203-a denotes a partial region for calculating the contrast as in the second embodiment of the present invention.
  • contrast is also applied to an image reproduced with the above-described laser wavelength and reference light angle conditions shifted.
  • a bit pattern fixed region including bit inversion of the minimum pixel unit is provided in the vertical direction including the center of the image (direction perpendicular to the reference light angle change direction).
  • page recording data of a page recorded at the same angle as the page on which the page image data 2201 is recorded in an adjacent book is also displayed in the same area 2203-b as 2201 in FIG.
  • a bit pattern fixed area including bit inversion of the unit is provided.
  • the bit patterns of 2203-a and area 2203-b have a bit pattern relationship.
  • Information other than the bit pattern fixed area is used as information data.
  • FIG. 25 shows a method of detecting a reproduction position by a reproduced image using the page image data 2201 and the page image data 2202 in a state where the optimum conditions of the reference beam angle and the laser wavelength are shifted during reproduction.
  • a hologram image 2301 is a book including the page image data 2201, and these are hereinafter referred to as a book 2501.
  • the hologram image 2502 is a book including the page image data 2202 and will be referred to as a book 2502 hereinafter.
  • Reference numeral 2504 denotes a case where the reproduction position is positioned at a position 2503 in the figure, that is, a position straddling the adjacent books 2501 and 2502, in which both the laser wavelength and the reference light angle deviate from the conditions for recording the page image data 2201.
  • regeneration image is shown typically.
  • an area 2506-a corresponding to the bit pattern fixed area 2203 of the page image data 2201 is the result of adding the luminance of the page image data 2201 and the page image data 2202, and the contrast decreases as shown in the figure. To do.
  • the playback image can be obtained only in the area 2504 in FIG. 25 as in FIG. 21A, but since the area 2504 includes the area 2506-a, a shift in the playback position is detected. It becomes possible to do.
  • reference numeral 2505 schematically illustrates a reproduction image when the reproduction position is positioned at a position 2503 that straddles the adjacent books 251 and 2502, and the laser wavelength is different from the condition at the time of recording the page image data 2201. It is shown.
  • the playback image can be obtained only in the area 2505 of FIG. 25 as in FIG. 21B, but the area 2505 has an area 2506-b corresponding to the bit pattern fixed area 2203 of the page image data 2201. Since it is included, it is possible to detect a deviation in the reproduction position.
  • the bit pattern fixed area is arranged in the vertical direction including the center of the reproduced image (direction perpendicular to the reference light angle change direction).
  • the laser wavelength at the time of recording at the time of reproduction see What is necessary is just to arrange
  • the number of the bit pattern fixed areas arranged in the book is not limited to the present embodiment.
  • the reproduction position deviation detection pattern is mounted on the partial area in the page where the information data is recorded.
  • the reproduction position deviation detection pattern is provided on the entire surface as in the first embodiment of the present invention. May be deployed.
  • the reproduction position shift detection pattern is a checkered pattern in units of minimum pixels.
  • the pattern may be a pattern including bit inversion in units of minimum pixels, and is limited to the contents of this embodiment. It is not something.
  • the contrast of the bit pattern fixed area is used for the reproduction position shift detection.
  • the reproduction with the average brightness using the area where the average brightness is known is used. Misalignment detection is also possible. In this case, the same effect can be obtained by making the bit pattern fixed region shown in the present embodiment a region where the average luminance is known.
  • the present invention can be applied not only to the angle multiplexing method but also to the shift multiplexing method. Therefore, in the above description, the book is used for the sake of simplicity. However, the book is not necessarily used, and may be a page.
  • 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.
  • 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.
  • SYMBOLS 1 Optical information recording medium, 10 ... Optical information recording / reproducing apparatus, 11 ... Pickup, 12 ... Reference light optical system for reproduction, 13 ... Disc Cure optical system, 14 ... Optical system for detecting disk rotation angle, 81 ... Access control circuit, 82... Light source drive circuit, 83... Servo signal generation circuit, 84 ... Servo control circuit, 85 ... Signal processing circuit, 86 ... Signal generation circuit, 87 ... Shutter control circuit, 88 ... Disc rotation motor control circuit, 89 ... Controller, 90 ... Input / output control circuit, 91 ... External control device, 201 ... Reproduction image contrast detection circuit, 301 ... light source, 303 ...

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Holo Graphy (AREA)

Abstract

Lors d'un enregistrement dense de livres sur un support d'enregistrement pour exécuter un enregistrement à haute densité d'un hologramme sur le support d'enregistrement, il est nécessaire de disposer précisément les livres à des positions de rayonnement de lumière de référence au moment de la lecture. La présente invention concerne un dispositif d'enregistrement optique d'informations, qui enregistre des informations sur un support d'enregistrement optique d'informations au moyen de l'holographie, pourvu d'une source de lumière qui allume un faisceau de lumière, d'une unité de séparation de faisceau de lumière qui sépare le faisceau de lumière en une lumière de référence et une lumière de signal, et d'une unité de modulation de lumière spatiale qui superpose des données de page sur la lumière de signal. L'unité de modulation de lumière spatiale met en place un premier motif de modulation sur des premières données de page enregistrées au niveau d'une première zone sur le support d'enregistrement optique d'informations. L'unité de modulation de lumière spatiale met en place un second motif de modulation, qui comprend un motif de modulation dans lequel une polarité binaire a été inversée par rapport à celle du premier motif de modulation, au niveau d'une partie prédéfinie de secondes données de pages enregistrées au niveau d'une seconde zone adjacente à la première zone.
PCT/JP2013/069729 2013-07-22 2013-07-22 Dispositif d'enregistrement optique d'informations, dispositif de lecture optique d'informations, procédé d'enregistrement optique d'informations et procédé de détection de défaut d'alignement de position de lecture WO2015011744A1 (fr)

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