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WO2015011745A1 - Support d'enregistrement optique d'informations, procédé d'enregistrement optique d'informations et procédé de lecture optique d'informations - Google Patents

Support d'enregistrement optique d'informations, procédé d'enregistrement optique d'informations et procédé de lecture optique d'informations Download PDF

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Publication number
WO2015011745A1
WO2015011745A1 PCT/JP2013/069730 JP2013069730W WO2015011745A1 WO 2015011745 A1 WO2015011745 A1 WO 2015011745A1 JP 2013069730 W JP2013069730 W JP 2013069730W WO 2015011745 A1 WO2015011745 A1 WO 2015011745A1
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WIPO (PCT)
Prior art keywords
data
pattern
optical information
information recording
page
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Ceased
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PCT/JP2013/069730
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English (en)
Japanese (ja)
Inventor
純也 飯塚
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Hitachi Consumer Electronics Co Ltd
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Hitachi Consumer Electronics Co Ltd
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Priority to PCT/JP2013/069730 priority Critical patent/WO2015011745A1/fr
Publication of WO2015011745A1 publication Critical patent/WO2015011745A1/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
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G11B7/00772—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track on record carriers storing information in the form of optical interference patterns, e.g. holograms
    • G11B7/00781—Auxiliary information, e.g. index marks, address marks, pre-pits, gray codes
    • 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

Definitions

  • the present invention relates to a recording medium for recording information using holography and a method for reproducing information on this type of recording medium.
  • An optical disk having a recording capacity of about 100 GB has been commercialized, and it is desired to increase the capacity to the same level as that of a hard disk drive in the future. To achieve such a high density, a shorter wavelength of the light source and a higher objective lens are required. A new system different from the conventional high density technology mainly for NA is required.
  • the hologram recording technique is generated when a signal light having page data information two-dimensionally modulated by a spatial light modulator is superposed on a reference light having the same wavelength as the signal light inside the recording medium.
  • This is a technique for recording information on a recording medium by causing refractive index modulation in the recording medium by an interference fringe pattern.
  • 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 an image sensor such as a CMOS or CCD.
  • an image sensor such as a CMOS or CCD.
  • the hologram recording technology enables two-dimensional information to be simultaneously recorded on an optical recording medium by one hologram, and further enables the information to be reproduced. 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
  • Patent Document 2 JP-A-2004-272268
  • This publication discloses a multiplexing method and apparatus in which holograms are spatially multiplexed by partial spatial overlap between adjacent stacks of holograms. Each stack is for example an angle, a wavelength, a phase.
  • Another multiplexing technique such as sign, peritropy, or fractal multiplexing can be further taken in.
  • An amount equal to the beam waist of the signal light writing the hologram separates the individual stacks of holograms.
  • a hologram and a hologram adjacent to the hologram are all read out simultaneously, and the adjacent hologram read out is not transmitted to the camera surface by arranging a filter at the beam waist of the reproduced data, or These undesired reproductions can be found in optical systems with limited angular passbands. Information, it is described that may be filtered. "By the intermediate plane of the angular filter.
  • Patent Document 2 JP-T-2008-536158.
  • This publication states that “there is a predetermined spare block assigned to each entire data page, each spare block including a known pixel pattern, an area of the data page and a predetermined spare block; By determining the data page position error by calculating the best match between and correcting the data pixels according to the corresponding data page position error at the detector. A process for enabling discrimination of two-dimensional page data is described.
  • Patent Document 3 discloses a technique for emphasizing and recording header information in hologram recording.
  • Patent Document 3 discloses a technique for emphasizing and recording header information. However, if recording is performed using this technique, light having a higher intensity than other parts is detected at the part where the header information is recorded at the time of reproduction, so when the amount of light detected at the other part is optimized The part of the header information exceeds the detection range of the image sensor, and there is a possibility that proper processing cannot be performed. On the other hand, if the appropriate amount of light is detected in the header information region, the amount of light detected in other regions may be too small to be detected correctly.
  • Such information used for checking page data and determining the data format is preferably recorded in a format that allows easier and more accurate determination than user data in order to perform it accurately and in a short processing time.
  • an object of the present invention is to provide an optical information recording medium, an optical information recording method, and an optical information reproducing method capable of easily and accurately discriminating page data and identifying a data format.
  • 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 means 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 means 90.
  • the optical information recording / reproducing apparatus 10 transmits the reproduced information signal to the external control apparatus 91 by the input / output control means 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 to the spatial light modulator in the pickup 11 by the controller 89 via the signal generating means 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 the signal is reproduced by the signal processing means 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 by the controller 89 via the shutter control means 87.
  • 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 the controller 89 uses the detected signal to control the disk rotation motor control means.
  • 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 means 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 quantity. 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 position control is performed via the access control means 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 unit 83, and the deviation amount is corrected via the servo control unit 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. 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. 6 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. 6A 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. 6C shows an operation flow until information is recorded on the information recording medium 1
  • FIG. 6C 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 information corresponding to the data is received from the spatial light modulator in the pickup 11. Send to.
  • the access control means 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 page data generation processing (617) including main data generation (615) and page header addition (616) is performed, and pickup is performed.
  • Data is recorded using the reference light and the signal light emitted from 11 (618).
  • post cure is performed using the light beam emitted from the cure optical system 13 (619). Data may be verified as necessary.
  • the main data is a part that occupies most of the page data, and mainly stores user data.
  • a table showing the correspondence between the logical address handled by the external control device 91 and the position of each page data in the optical information recording medium 1, or replacement of page data that has become difficult to reproduce due to a defect You may make it store the replacement position list
  • the page header is an area provided on the page data for storing information such as the type and data format of the data recorded in the page data and the address for identifying the multiple recorded pages. Is provided separately from the recording area on the page data.
  • the operation flow from the ready state to the reproduction of recorded information is as follows.
  • the access control means 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. 9 shows a data processing flow during recording and reproduction.
  • FIG. 9A shows the two-dimensional data on the spatial light modulator 312 after the recording data reception processing 611 in the input / output control means 90.
  • FIG. 9B shows a recording data processing flow in the signal generation means 86 until conversion.
  • FIG. 9B shows the process up to the reproduction data transmission process 624 in the input / output control means 90 after the two-dimensional data is detected by the photodetector 325.
  • the reproduction data processing flow in the signal processing means 85 is shown.
  • the data processing during recording will be described with reference to FIG.
  • the processing from 901 to 906 corresponds to the internal processing of the main data generation (615) in the processing of FIG.
  • the signal generation means 81 receives user data (901), it is divided into a plurality of data strings and each data string is converted to CRC (902) so that error detection during reproduction can be performed, and the number of on pixels and the number of off pixels are substantially equal.
  • the data string is scrambled (903) to add a pseudo random number data string, and then error correction coding such as a Reed-Solomon code (904) is performed so that error correction can be performed during reproduction. )I do.
  • the two-dimensional data (905) is configured by arranging the error correction encoded data string according to a predetermined rule.
  • a modulation process such as run-length limited modulation may be added in the process 905.
  • 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 a page header is added (616) to the spatial light modulator 312. Data is transferred (907).
  • the processing from 912 to 919 corresponds to the internal processing of data reproduction (624) in the processing of FIG.
  • the image data detected by the photodetector 325 is transferred to the signal processing means 85 (911), and the page header is discriminated from the detected image data (623), and the data stored in the page header is acquired.
  • the image position is detected with reference to the marker included in the image data (912), and distortion such as the tilt, magnification, and distortion of the image is corrected (913), and then binarization processing (914) is performed.
  • 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 means 90. If it can be expected that the image position detection by the marker (912) can be performed more easily than the determination of the page header (623), the order of these processes is changed, and the image position detection result by the marker is used for the page. A header search may be performed.
  • FIG. 7 is a block diagram of the signal generation means 86 of the optical information recording / reproducing apparatus 10.
  • the input / output control means 90 When the input of user data is started to the output control means 90, the input / output control means 90 notifies the controller 89 that the input of user data has been started. In response to this notification, the controller 89 instructs the signal generation unit 86 to record one page of data input from the input / output control unit 90 and provides the header pattern generation unit 710 with information to be stored in the page header. A processing command from the controller 89 is notified to the sub-controller 701 in the signal generation means 86 via the control line 708. Upon receiving this notification, the sub-controller 701 controls each signal processing means via the control line 708 so that the signal processing means are operated in parallel.
  • the memory control unit 703 is controlled to store the user data input from the input / output control unit 90 via the data line 709 in the memory 702.
  • the CRC calculation means 704 performs control to convert the user data into CRC.
  • the scrambler 705 scrambles the CRC-converted data by adding a pseudo-random data sequence
  • the error correction encoder 706 performs error correction encoding by adding a parity data sequence.
  • a recording marker of the main data portion of the page data is generated by adding a reference marker at the time of reproduction, and stored in the memory 702.
  • the header pattern generation unit 711 generates a page header recording pattern based on the information stored in the page header input from the controller 89 and stores it in the memory 702.
  • the pickup interface unit 707 reads the recording pattern of the main data and the recording pattern of the page header from the memory 702 in the order of the two-dimensional data on the spatial light modulator 312, and causes the spatial light modulator 312 in the pickup 11 to read it. Transfer two-dimensional data.
  • FIG. 8 is a block diagram of the signal processing means 85 of the optical information recording / reproducing apparatus 10.
  • the controller 89 instructs the signal processing means 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 means 85 via the control line 811.
  • the sub-controller 801 controls each signal processing unit via the control line 811 so that the signal processing units operate in parallel.
  • the memory control unit 803 is controlled to store the image data input from the pickup 11 via the pickup interface unit 810 via the data line 812 in the memory 802.
  • the header pattern decoding unit 813 decodes the data stored in the page header, and the detected page data identification information is the page data to be reproduced.
  • the image position detection unit 809 performs control for detecting a marker from the image data stored in the memory 802 and extracting an effective data range.
  • the image distortion correction unit 808 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 binarizing means 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 means 806 corrects the error included in each data string
  • the scramble release means 805 releases the scramble to add the pseudo random number data string
  • the CRC calculation means 804 introduces an error in the user data on the memory 802. Check not included. Thereafter, the user data is transferred from the memory 802 to the input / output control means 90.
  • FIG. 10A shows the positions of the signal light and the page data on the pixel surface of the spatial light modulator 312 and the position of the page header area in the page data.
  • Reference numeral 1001 denotes a main data area
  • reference numeral 1002 denotes a page header area
  • reference numeral 1003 denotes a spatial light modulator pixel
  • reference numeral 1004 denotes a signal light optical axis position.
  • the pixels 1003 of the spatial light modulator are arranged in a matrix along two orthogonal directions as shown in the enlarged view of FIG. 10A.
  • the respective directions are defined as an X direction and a Y direction.
  • the pixel sizes of the spatial light modulator pixel 1003 in these directions are denoted by ⁇ X and ⁇ Y.
  • the signal light optical axis position 1004 is a point where the optical axis of the signal light 314 directed to the optical information recording medium via the relay lens 313, the spatial filter 314, and the objective lens 315 is located on the pixel surface of the spatial light modulator 312. .
  • the side view represents a cross-sectional view of the signal light 306, the relay lens 313, and the spatial filter 314 in the X and Y directions, and the opening sizes of the spatial filter 314 are denoted as Xspfs and Yspf, respectively.
  • Xspfs the opening sizes of the spatial filter 314
  • Yspf the opening sizes of the spatial filter 314
  • the main data area 1001 is an area where user data is mainly recorded in the page data.
  • the main data area 1001 is centered on the signal light optical axis position 1004 on the pixel surface of the spatial light modulator 312 and is shown in FIG.
  • the objective lens 315 is a circle having a diameter substantially equal to the smaller one of the effective diameters of the objective lens 315. By making such a circular region, the effective diameter region of the relay lens 313 and the objective lens 315 can be utilized without waste, and the maximum data size that can be stored in a single page data can be obtained. . In the case where the loss of data size is allowed, it does not necessarily have to be circular.
  • the page header area 1002 is an area for recording a page header for storing information such as the type and data format of data recorded in the page data and an address for identifying the multiple recorded pages. It is arranged on a straight line in the X direction or the Y direction passing through the axial position 1004, and is a rectangular region having the direction of these straight lines as a long side.
  • FIG. 10A shows an example in which page header regions 1002 are provided in both the X direction and the Y direction.
  • FIG. 10B is an example provided only in the X direction.
  • FIG. 10C is an example provided only in the Y direction.
  • FIG. 10D is an example in which two page header areas 1002 are provided only in the X direction, and a plurality of page header areas 1002 divided in this way may be provided.
  • the detection image is less distorted during reproduction because it is less affected by the aberration of the optical component than when the page header region 1002 is concentrated in the periphery of the page data. An effect of enabling acquisition of a small page header image is obtained.
  • the page header in this embodiment is recorded as a bit pattern arranged one-dimensionally in the long side direction of the page header area 1002 as described later.
  • the bandwidth of the spatial frequency of the page data image detected at the time of reproduction is proportional to the aperture size of the spatial filter 314, the smaller the product of the pixel size of the spatial light modulator 312 and the aperture size of the spatial filter 314, The ratio of the spatial frequency band to the spatial sampling frequency (the reciprocal of the pixel interval of the spatial light modulator 312) decreases, and the amount of intersymbol interference between pixels increases.
  • page header regions 1002 are provided in both directions as shown in FIG. 10A. If the X direction and the Y direction are significantly different, it is preferable to provide a page header area 1002 only in one direction where the product value is small, as shown in FIGS. 10B, 10C, and 11D.
  • modulating the minimum continuous length of at least one of on and off pixels along one direction of the page data to reduce the spatial frequency bandwidth in this direction and This is the case when applying the spatial filter 314 having a smaller aperture size than the other direction.
  • Such a technique is disclosed in, for example, Japanese Patent Application Laid-Open No. 2010-003358.
  • the minimum continuous length of on-pixels and off-pixels in the X direction is limited to reduce the spatial frequency in the X direction and the aperture size of the spatial filter 314 in the X direction is shorter than the Y direction, only the Y direction
  • the page header region 1002 may be provided only in the X direction.
  • the direction in which the opening size is long makes it easy to read the data in the page header region 1002, while the direction in which the opening size is short is difficult to read.
  • the page header region can be accurately reproduced by configuring in this way. In addition, a large amount of main data area can be secured.
  • FIG. 1 shows an example of the pattern of the page header area 1002.
  • Fig. 1 (a) is an example of a bit pattern representing information of each bit of data to be stored.
  • Reference numeral 101 denotes a clock pattern unit
  • 102 denotes a data pattern unit.
  • the squares in the figure represent pixels of the spatial light modulator 312. Each pixel modulates light into two polarities, on and off. Pixels shown in white are on-pixels, and pixels shown in black are off-pixels.
  • the bit pattern representing each bit has a clock pattern portion 101 and a data pattern portion 102, which are close to each other in the short side direction of the page header area 1002.
  • the bit pattern representing “1” and the bit pattern representing “0” are distinguished by the data pattern unit 102, and the clock pattern unit 101 is common.
  • the data pattern part is divided into two equal parts in the long side direction of the page header area 1002, and different polarities are given to the pixels in each area so that a constant luminance level is maintained regardless of the bit information to be recorded. ing.
  • the clock pattern portion 101 has two regions each corresponding to 1/4 of both ends (corresponding to two pixels in FIG. 1A) and a central portion (FIG. 1A) in the long side direction of the page header region 1002. ) Is equivalent to 4 pixels in the middle), and the central part and the peripheral part have different polarities.
  • Fig. 1 (b) is an example of a data string of a plurality of bits using the bit pattern shown in Fig. 1 (a).
  • Reference numeral 103 denotes a clock pattern
  • reference numeral 104 denotes a data pattern.
  • the clock pattern 103 has the same period as that of the bit pattern (corresponding to 8 pixels in FIGS. 1A and 1B), and the on-pixel portion and the off-pixel portion have the same width (FIG. 1). (equivalent to the 8 pixels in (b)).
  • the data pattern 104 is composed of an on-pixel area and an off-pixel area having the same width as that of the bit pattern (corresponding to 8 pixels in FIGS. 1A and 1B) or a half of the width. Is done. Further, the polarity change point of the data pattern 104 is located at the center between successive polarity change points of the clock pattern 103 with respect to the long side direction of the page header area 1002.
  • FIG. 1C shows the intensity distribution of the signal light obtained from the clock pattern 103 and the data pattern 104 shown in FIG. 1B, with the position on the straight line along the long side direction of the page header area 1002 as the horizontal axis. It is the shown schematic. Here, the signal intensity obtained from the on-pixel is illustrated as being greater than the signal intensity obtained from the off-pixel.
  • 105 is a clock pattern detection signal
  • 106 is a data pattern detection signal.
  • the vertical axis represents the signal intensity, and the center level of the signal is shown as an intersection with the horizontal axis.
  • the intersection between the plot line of each detection signal and the horizontal axis corresponds to the polarity change point in FIG. In the following, the intersection of the horizontal axis and the plot line is referred to as a zero cross point.
  • the zero cross points of the data pattern detection signal 106 are also located at equal intervals in correspondence with the polarity change points of the data pattern 104 being located at the center between successive polarity change points of the clock pattern 103. It is located at the center between the zero cross points of the pattern detection signal 105.
  • the zero cross position of the clock pattern is discriminated from the clock pattern detection signal 105, the signal intensity of the data pattern detection signal 106 at the obtained zero cross position is subsequently detected and compared with the center level. It can be expected to obtain an effect that the discrimination can be performed easily and accurately.
  • the center level can be obtained by using a low-pass filter that cuts off the repetitive spatial frequency with respect to the clock pattern detection signal 105. Further, the center level of the clock pattern detection signal thus obtained is used. Can be used for pattern discrimination of adjacent data pattern detection signals 106. Further, the peak level and bottom level of the clock pattern detection signal can be detected from the central signal level between the zero cross positions of the clock pattern detection signal.
  • the page header area 1002 from the page data detected by the photodetector 325 is determined.
  • the clock pattern 103 and the data pattern 104 from the page header area 1002 it is necessary to determine an appropriate position in the short side direction of the page header area 1002. Therefore, at least two patterns called position reference markers are provided along the long side direction of the page header region 1002 below.
  • FIG. 11A, FIG. 11B, FIG. 11C, FIG. 11D, FIG. 11E, and FIG. 11F show examples of arrangement positions of position reference markers, and 1101 represents a position reference marker in each.
  • FIG. 11A shows an example in which position reference markers 1101 are arranged at both ends of one page header area 1002 arranged in one direction.
  • FIG. 11B is an example in which position reference markers 1101 are arranged at both ends and the center of one page header area 1002 arranged in one direction. If the page header area 1002 is largely distorted and deviates from the straight line connecting the two position reference markers 1101 provided at both ends at the center, the reference position marker 1101 is added to the center in this way and detection described later By performing the processing, the detection accuracy of the pattern in the page header area can be improved. In addition, as long as an area for storing page header information can be secured, not only the central portion but also a larger number of reference position markers 1101 may be provided.
  • FIG. 11C is an example in which the position reference markers 1101 are arranged at two locations in the middle of one page header area 1002 arranged in one direction. If the aberration of the optical component or the distortion of the disc is excessively applied, there may be a case where a sufficient amount of detected light cannot be obtained at the periphery of the detected image of page data during reproduction. By providing the position reference marker 1101 as shown in FIG. 11C, the position reference marker 1101 can be detected even in such a case.
  • FIG. 11D is an example in which position reference markers 1101 are arranged at both ends of two page header areas 1002 arranged in one direction.
  • the two page header regions 1002 are divided as shown in FIG. The page header can be detected accurately and easily in the same manner as in the above example.
  • FIG. 11E is an example in which a position reference marker 1101 is arranged in the middle between two page header areas 1002 arranged in one direction.
  • the position reference markers 1101 are provided at both ends of the two page header regions 1002.
  • the page header can be detected accurately and easily.
  • FIG. 11F shows an example in which page header areas 1002 are arranged in two directions.
  • the position reference markers 1101 are arranged at the center and both ends, and the center portion is used in two directions.
  • two or more position reference markers 1101 are provided along each direction. If so, another pattern may be arranged in the central portion.
  • the polarity inversion of the clock pattern unit 101 during reproduction and the position on the photodetector 325 where the position reference marker 1101 is detected and the signal intensity By performing the two-dimensional linear interpolation process using, the distortion and intensity unevenness of the entire page data image detected by the photodetector 325 can be estimated and corrected. .
  • FIG. 12A is a configuration example of the position reference marker 1101. It consists of a rectangular central part and a peripheral part surrounding the central part, and the central part and the peripheral part are composed of pixels of different polarities.
  • FIG. 12A shows an example in which the peripheral portion is an on-pixel and the central portion is an off-pixel, the reverse may be possible.
  • the size in the short side direction of the page header area 1002 in the center is determined to be about half the sum of the clock pattern size and the data pattern size in the same direction.
  • FIG. 12B shows the positional relationship between the position reference marker 1101 and the page header area 1002.
  • 1202 is a marker center upper boundary line
  • 1203 is a wrinkle marker center lower boundary line.
  • the marker center upper boundary line 1202 and the marker center lower boundary line 1203 connect the upper and lower boundaries of the center part of the two position reference markers 1101 arranged with respect to the page header region 1002 in the same direction. It is a straight line.
  • the position reference marker 1101 is arranged so that the upper and lower sides of the center portion are positioned at the center of each of the clock pattern 103 and the data pattern 104 in the short side direction of the page header area 1002. With this positional relationship, the marker center upper boundary line 1202 and the marker center lower boundary line 1203 become the respective center positions in the short side direction of the page header area 1002 of the clock pattern 103 and the data pattern 104. .
  • the page header for detecting the clock pattern 103 and the data pattern 104 by detecting the center part of the two position reference markers 1101 and determining the marker center upper boundary line 1202 and the marker center lower boundary line 1203. An appropriate position in the region short side direction can be determined.
  • the central portion and the peripheral portion of the position reference marker 1101 are occupied by pixels having opposite polarities. If the region is within the position reference marker 1101, the central portion and the peripheral portion can be easily distinguished by the polarity of the pixel. It is. Therefore, the central portion can be easily detected by searching within the position reference marker 1101 as a range by ensuring the peripheral region range sufficiently large with respect to the magnitude of the shift / distortion of the detection image during reproduction. It becomes.
  • the clock pattern 101 has a certain periodicity, it is possible to interpolate from the position around the detection failure part even when a part of the clock pattern 101 is not detected correctly in many cases. There is a possibility that erroneous detection or omission of the pattern occurs and the data detected from the header is discriminated from the correct bit position.
  • synchronization patterns are provided at regular intervals as patterns other than “1” ⁇ “0”, and bit position deviation is corrected with reference to the detection position of the synchronization pattern. You should be able to do it.
  • FIG. 13A shows an example of a synchronization pattern.
  • the clock pattern unit 101 arranges the clock pattern 103 and a pattern ensuring the continuity of the cycle and phase.
  • the data pattern unit 102 an on-pixel pattern and an off-pixel pattern having a width 1.5 times the period of the clock pattern 103 are arranged.
  • FIG. 13B shows an example in which the synchronization pattern shown in FIG. 13A is inserted into the page header area 1002, and the data portion in the figure is a part where bit patterns representing information of “1” or “0” are arranged.
  • the synchronization unit is a part where the synchronization pattern shown in FIG. 13A is arranged.
  • the clock pattern 103 has a pattern with a uniform period without distinction between the data part and the synchronization part, and the data pattern 104 has an on-pixel pattern and an off-pixel pattern with a 1.5 period width only in the synchronization part. .
  • FIG. 14A shows another example of the synchronization pattern.
  • the pattern has a three-cycle width centered on a portion having a width corresponding to 1.5 cycles of the clock pattern 103 with respect to the long-axis direction of the page header region 1002, and the short-axis direction of the page header region 1002 Unlike the example shown in FIGS. 13A and 13B, the clock pattern unit 101 and the data pattern unit 102 are uniform without distinction.
  • FIG. 14B shows an example in which the example of the synchronization pattern shown in FIG. 14A is inserted into the page header area 1002, and the data part in the figure is a part where bit patterns representing information of “1” or “0” are arranged. is there.
  • the synchronization unit is a part where the synchronization pattern shown in FIG. 14A is arranged.
  • the synchronization pattern can be determined according to one condition.
  • the width of the synchronization pattern is exactly an integral multiple of the cycle of the clock pattern. By selecting this, it is possible to interpolate the clock pattern.
  • FIG. 25A shows still another example of the synchronization pattern.
  • the major axis direction is the same width as the position reference marker 1101 and larger than the 0.5 or 1 clock cycle length pattern that forms the data pattern and the clock pattern.
  • This is a pattern of an integer (3 in the figure) clock period width having a rectangular central part with a size of (2 clock period length in the figure) and surrounded by pixels having a polarity different from that of the central part.
  • FIG. 25B shows an example in which the synchronization pattern shown in FIG. 25A is inserted into the page header area 1002, and the data portion in the figure is a part where bit patterns representing information of “1” or “0” are arranged.
  • the synchronization unit is a part where the synchronization pattern shown in FIG. 25A is arranged.
  • a synchronization pattern When such a synchronization pattern is applied, it is possible to discriminate the synchronization pattern by detecting the central part based on the polarity change positions in the short axis and long axis directions. Further, regarding the length of the page header region 1002 in the major axis direction, if the length of the data portion is sufficiently larger than the width of the synchronization portion, the clock pattern interrupted by the synchronization portion can be interpolated. Further, when the synchronization pattern shown in FIG.
  • the position in the minor axis direction for detecting the polarity change point in the minor axis direction at the center and discriminating between the clock pattern and the data pattern, like the position reference marker 1101. Can be used to determine the marker center upper boundary line 1202 and the marker center lower boundary line 1203 for determining the position of the marker.
  • each page header area 1002 is set to Header1, Header2, Header3, and Header4.
  • the same information is stored in these four page header areas, and the data is quadrupled, but the arrangement order of the stored data is different in each area. That is, the data pattern area of these four page header areas is further divided into four parts, and the data to be stored is also divided into Part A, B, C, D, and Part A in Headers 1 to 4 , B, C, and D are arranged as follows. An example satisfying this arrangement order is shown in FIGS. 15A and 16A.
  • the header is arranged in the order of Part ABCD in the order from the center of the page data (Header 1 in FIG. 16A)
  • the order of arrangement in the remaining three headers is Part DCBA (Header 2 in FIG. 16A), Part C-A-D-B (Header 3 in FIG. 16A), Part B-D-A-C (Header 4 in FIG. 16A).
  • FIG. 15B shows the arrangement order from the center of Part A, B, C, D in each Header in the arrangement of FIG. 15A, and the arrangement order from the center in the four Headers is different for all Part. It is shown.
  • FIG. 16B shows the arrangement order from the center of Part A, B, C, D in each Header in the arrangement of FIG. 16A, and the arrangement order from the center in the four Headers for all Part. It is shown that they are different from each other. This means that there is no bias with respect to the arrangement of each Part, and there is a small risk that a specific Part will occur in the determination in all four Headers.
  • FIG. 17 shows an example of the pattern of the page header area 1002 in this embodiment.
  • ⁇ in the figure represents pixels of the spatial light modulator 312. Each pixel modulates light into two polarities, on and off. Pixels shown in white are on-pixels, and pixels shown in black are off-pixels.
  • FIG. 17C schematically shows the pattern of the page header area 1002 in this embodiment, and the short side of the page header area 1002 with respect to the clock pattern 103 having a constant period with respect to the long side direction of the page header area 1002.
  • Two rows of data patterns, data pattern A (1704) and data pattern B (1705), are arranged close to each other in the direction.
  • FIG. 17A shows a bit pattern corresponding to 1-bit data in data pattern A (1704).
  • FIG. 17B shows a bit pattern corresponding to 1-bit data in data pattern B (1705). Both of these are composed of a clock pattern unit 101 and a data pattern unit 102. The positional relationship between the data pattern A (1704) and the data pattern B (1705) is adjacent to the clock pattern 103. Different. That is, in the bit pattern of the data pattern A (1704), the clock pattern unit 101 is positioned below the data pattern unit 102 in the figure, and in the bit pattern of one data pattern B (1705), the data pattern unit The clock pattern unit 101 is located on the upper side in FIG.
  • the bit pattern representing “1” and the bit pattern representing “0” are distinguished by the data pattern unit 102 and The pattern unit 101 is common.
  • the data pattern part is divided into two equal parts in the long side direction of the page header area 1002, and different polarities are given to the pixels in each area so that a constant luminance level is maintained regardless of the bit information to be recorded.
  • the clock pattern portion 101 is divided into two regions each having a quarter of both ends (corresponding to two pixels in FIG. 1A) and a central portion (FIG. 1A) with respect to the long side direction of the page header region 1002. ) (Corresponding to 4 pixels in the above), and the central part and the peripheral part have different polarities. Note that the width in the short side direction of the page header area 1002 of the data pattern portion is the same for both the bit patterns of the data pattern A and the data pattern B.
  • the pattern shown in FIG. 17C is obtained by arranging the bit patterns of data pattern A and data pattern B shown in FIGS. 17A and 17B corresponding to the data stored in the respective areas.
  • the clock pattern 103 in FIG. 17C has the same cycle as the bit pattern width (corresponding to 8 pixels in FIGS. 17A, 17B, and 17C), and the widths of the on-pixel portion and the off-pixel portion are the same (in FIG. 17C). Equivalent to 8 pixels).
  • Data pattern A (1704) and data pattern B (1705) are both on-pixels having the same width as the bit pattern (equivalent to 8 pixels in FIGS. 17A, 17B, and 17C) or half the width thereof. It consists of a region and an off-pixel region. Further, the polarity change points of the data pattern A (1704) and the data pattern B (1705) are both located at the center between successive polarity change points of the clock pattern 103 with respect to the long side direction of the page header region 1002.
  • the discrimination between the data pattern A (1704) and the data pattern B (1705) in the header pattern of this embodiment shown in FIG. 17C is the same as the discrimination of the data pattern 104 in the example of FIG. 1 from the clock pattern detection signal 105.
  • the clock pattern has periodicity, when a missing portion is generated, it can be interpolated from the surrounding positional relationship as in the example of FIG.
  • the position reference markers may be arranged as shown in FIGS. 11A, 11B, 11C, 11D, and 11E.
  • the position reference marker for the header pattern of this embodiment, and the position in the short side direction of the page header area 1002 for detecting the clock pattern 103, the data pattern A (1704), and the data pattern B (1705) are determined by the position reference marker.
  • the method will be described with reference to FIG.
  • Reference numeral 1801 denotes a position reference marker
  • 1802 denotes a marker center upper boundary line
  • 1803 denotes a marker center center line
  • 1804 denotes a marker center lower boundary line.
  • FIG. 18A is a configuration example of the position reference marker 1801. It consists of a rectangular central part and a peripheral part surrounding the central part, and the central part and the peripheral part are composed of pixels of different polarities.
  • FIG. 18A shows an example in which the peripheral portion is an on-pixel and the central portion is an off-pixel, the reverse is also possible.
  • the size of the page header area 1002 in the central portion in the short side direction is such that the width of the clock pattern 103 is added to half the sum of the widths of the data pattern A (1704) and the data pattern B (1705) in the same direction. Stipulated in
  • FIG. 18B shows the positional relationship between the position reference marker 1801 and the page header area 1002.
  • the marker center upper boundary line 1802 and the marker center lower boundary line 1804 connect the upper and lower boundaries of the center part of the two position reference markers 1801 arranged with respect to the page header region 1002 in the same direction. It is a straight line.
  • the position reference marker 1801 is arranged so that the upper and lower sides of the center portion are positioned in the vicinity of the respective centers of the data pattern A (1704) and the data pattern B (1705) in the short side direction of the page header area 1002. . With such a positional relationship, the marker center upper boundary line 1802 and the marker center lower boundary line 1804, and the center positions of the clock pattern 103 and the data pattern 104 in the short-side direction of the page header area 1002 are obtained.
  • the detection of the data pattern A (1704) and the data pattern B (1705) is performed by detecting the center of the two position reference markers 1801 and determining the marker center upper boundary line 1802 and the marker center lower boundary line 1804. It is possible to determine an appropriate position in the direction of the short side of the page header area for performing. Further, by obtaining a marker center part center line 1803 that bisects between the marker center upper boundary line 1802 and the marker center lower boundary line 1804, the page header area short side direction for detecting the clock pattern 103 is obtained.
  • the center part and the peripheral part of the position reference marker 1801 are occupied by pixels having opposite polarities. If the region is within the position reference marker 1801, the center part depends on the polarity of the pixel. And the peripheral part can be easily distinguished. Therefore, the central portion can be easily detected by searching the position reference marker 1801 as a range by ensuring the peripheral region range sufficiently large with respect to the magnitude of the shift / distortion of the detected image during reproduction. it can.
  • FIG. 19A shows an example of a synchronization pattern.
  • the clock pattern unit 101 arranges the clock pattern 103 and a pattern ensuring the continuity of the cycle and phase.
  • An on-pixel pattern and an off-pixel pattern having a width 1.5 times the period of the clock pattern 103 are arranged in the two data pattern units 102 sandwiching the clock pattern unit 101, respectively.
  • FIG. 19B shows an example in which the synchronization pattern shown in FIG. 19A is inserted into the page header area 1002, and the data portion in the figure is a part where bit patterns representing information of “1” or “0” are arranged.
  • the synchronization unit is a part where the synchronization pattern shown in FIG. 19A is arranged.
  • the clock pattern 103 has a pattern with a uniform period without distinction between the data part and the synchronization part, and the data pattern A (1704) and the data pattern B (1705) have an on-pixel with a 1.5 period width only in the synchronization part. A pattern and an off-pixel pattern are respectively arranged.
  • FIG. 20A shows another example of the synchronization pattern.
  • it is a pattern having a four-cycle width centered on a portion having a width corresponding to two cycles of the clock pattern 103 with respect to the major axis direction of the page header region 1002, and the minor axis direction of the page header region 1002 is Unlike the example shown in FIGS. 19A and 19B, the clock pattern unit 101 and the data pattern unit 102 are uniform without being distinguished.
  • FIG. 20B shows an example in which the example of the synchronization pattern shown in FIG. 20A is inserted into the page header area 1002, and the data portion in the figure is a part where bit patterns representing information of “1” or “0” are arranged. is there.
  • the synchronization unit is a part where the synchronization pattern shown in FIG. 20A is arranged.
  • a uniform synchronization pattern is applied without distinguishing between the clock pattern unit 101 and the data pattern unit 102
  • the synchronization pattern can be determined.
  • the width of the synchronization pattern is exactly an integral multiple of the cycle of the clock pattern. By selecting this, it is possible to interpolate the clock pattern.
  • FIG. 26A shows still another example of the synchronization pattern.
  • the length is the same width as the position reference marker 1801, and is clearly longer than the 0.5 or 1 clock cycle length pattern that forms the data pattern and the clock pattern.
  • This is an integer (4 in the figure) clock cycle width pattern that has a rectangular central part with an axial size (in the figure, 2 clock periods long) and is surrounded by pixels that differ in polarity from the central part.
  • FIG. 26B shows an example in which the synchronization pattern shown in FIG. 26A is inserted into the page header area 1002, and the data portion in the figure is a part where bit patterns representing information of “1” or “0” are arranged.
  • the synchronization unit is a part where the synchronization pattern shown in FIG. 26A is arranged.
  • a synchronization pattern When such a synchronization pattern is applied, it is possible to discriminate the synchronization pattern by detecting the central part based on the polarity change positions in the short axis and long axis directions. Further, regarding the length of the page header region 1002 in the major axis direction, if the length of the data portion is sufficiently larger than the width of the synchronization portion, the clock pattern interrupted by the synchronization portion can be interpolated. Further, when the synchronization pattern shown in FIG.
  • the marker center upper boundary line 1802, the marker center lower boundary line 1804, and the marker center center line 1803 for determining the position can be used.
  • each page header area 1002 has a clock pattern 103 as shown in FIG.
  • a header pattern provided with two data patterns (data pattern A 1704 and data pattern B 1705) is applied.
  • a total of four data patterns existing in the two page header areas are defined as leader1, Header2, Header3, and Header4.
  • the same information is stored in these four page header areas, and the data is quadrupled, but the arrangement order of the stored data is different in each area.
  • the data pattern area of these four page header areas is further divided into four parts, and the data to be stored is also divided into Part A, B, C, D, and Part A in Headers 1 to 4 , B, C, and D are arranged as follows.
  • An example satisfying this arrangement order is shown in FIGS. 21A and 22A.
  • Part ABCD Header 1 in FIG. 21A
  • Part ABCD Header 1 in FIG. 21A
  • the arrangement order in the remaining three headers is Part DCABA (FIG. 21A, Header CD), Part CDA-B (Header 3 in FIG. 21A), Part B-A-D-C (Header 4 in FIG. 21A).
  • the header is arranged in the order of Part ABCDD (Header 1 in FIG. 22A) from the center of the page data in the header
  • the arrangement order in the remaining three headers is Part DCBA (Header 2 in FIG. 22A), Part C-A-D-B (Header 3 in FIG. 22A), and Part B-D-A-C (Header 4 in FIG. 22A).
  • FIG. 21B shows the arrangement order from the center of Part A, B, C, D in each Header in the arrangement of FIG. 21A, and the arrangement order from the center in the four Headers is different for all Part. It is shown.
  • FIG. 22B shows the arrangement order from the center of Part A, B, C, and D in each Header in the arrangement of FIG. 22A, and the arrangement order from the center in the four Headers for all Part. It is shown that they are different from each other. This means that there is no bias with respect to the arrangement of each Part, and there is a small risk that a specific Part will occur in the determination in all four Headers.
  • each header is divided into four parts.
  • the number of divisions is not necessarily limited to four.
  • each header is part of Part A 'Part B'. The same effect can be obtained even if the two parts are divided and arranged so that the opposing Part is different with the clock pattern interposed therebetween.
  • the number of headers to be arranged is not necessarily four.
  • a page in which a data pattern 104 consisting of two regions of Part A ′ and Part B ′ in a row along the clock pattern 103 is provided.
  • the same effect can be obtained by arranging the headers of header 1 and header 2 with the configuration of the header region 1002 and the center of the header pattern in the long side direction.
  • the page header region 1002 may be provided with the data pattern 104 sandwiched between the clock patterns 103, and the two headers Header1 and Header2 may be arranged to face each other across the clock pattern 102. A similar effect can be obtained.
  • Fig. 5 (a) shows an example of a page header generation flow.
  • the generation of a page header includes a storage information encoding step 2701, a header data string generation step 2702, and a header patterning step 2703.
  • a header storage information acquisition step 2704 for acquiring or generating information to be stored in the header such as information representing the pattern format of page data and information for identifying page data is obtained.
  • a CRC code adding step 2705 for adding a CRC code used for error detection during reproduction to the information, and a step 2706 for performing error correction coding on the data after the CRC code addition are performed. Through these steps, error-corrected encoded information to be stored in the page data is generated.
  • header data sequence generation step 2702 data sequences corresponding to each data pattern are recorded in a page header multiplexed and recorded from the encoded information obtained in storage information encoding step 2701 to ensure reliability. Is generated.
  • the error correction encoded information generated in the payment information encoding step 2701 is divided into several partial data strings. For example, when generating the page header shown in FIG. 15, FIG. 16, FIG. 21, and FIG. 22, it is divided into four partial data strings of Part A, B, C, and D, and shown in FIG. If the indicated page header is used, it is divided into two partial data strings of Part A ′ and B ′.
  • each header data string synthesizing step 2708 the partial data strings obtained in the storage information encoding step 2701 are appropriately rearranged to synthesize data strings corresponding to the respective data patterns.
  • Header 1 in which partial data strings are arranged in the order of Part ABCD from the center of the page
  • Partial data strings in the order of Part DCBA.
  • Data sequence corresponding to Header 4 and Header 4 in which partial data sequences are arranged in the order of Header 3 and Part BDAC in which the partial data sequences are arranged in the order of Header 2 and Part C-A-D-B. Is synthesized.
  • Header 1 in which partial data strings are arranged in the order of Part A′-B ′ from the center of the page
  • Header 2 in which partial data strings are arranged in the order of Part B′-A ′.
  • a data string corresponding to is synthesized.
  • a two-dimensional header pattern to be displayed on the page data is generated based on the data string generated in the header data string generating step 2702.
  • a two-dimensional pattern (for example, FIG. 1A or FIG. 1) consisting of a plurality of pixels determined corresponding to 1-bit information is applied to the data sequence generated in the header data sequence generation step 2702. 17A and 17B) are arranged, and a two-dimensional data pattern 104 and a clock pattern 103 arranged along this are generated.
  • the two-dimensional pattern corresponding to this 1-bit information is selected so that the generated clock pattern 103 and data pattern satisfy the following conditions.
  • each data pattern and clock pattern generated in the data pattern and clock pattern generation step 2709 is arranged in a predetermined pixel position in the page data.
  • a position reference pattern and a synchronization pattern are added to the header pattern arranged in the page data arrangement step 2710. According to the above flow, a two-dimensional pattern of the page header can be generated. The generated two-dimensional pattern is recorded on the optical information recording medium 1.
  • FIG. 5B shows an example of the reproduction flow of the page header generated as described above.
  • a position reference pattern search step 2801 In the reproduction of page data, a position reference pattern search step 2801, a data pattern and clock pattern short axis direction determination position determination step 2802, a data pattern long axis direction determination position determination step 2803, a header data string restoration step 2804, and a stored data acquisition step 2805.
  • a position reference pattern is searched from the entire two-dimensional page data detected by the photodetector 325. For simplicity, at least one of the distances between the polarity change points in the major axis direction and the minor axis direction is recorded around the pixel position of the photodetector that is expected to detect the position reference pattern.
  • a position reference pattern can be searched for by searching for a pattern that is about the number of pixels in the center of the reference pattern. More precisely, an expected value pattern of the position reference pattern image detected by the photodetector 325 is obtained in advance, and the position reference pattern is detected around the pixel position of the photodetector that is expected to detect the position reference pattern.
  • the position reference pattern can be determined by acquiring a plurality of two-dimensional patterns having a size expected to be imaged and selecting the one having the maximum covariance value or total correlation value between these and the expected value pattern.
  • the data pattern and clock pattern short axis direction determination position determination step 2802 the short axis direction determination position of each of the data pattern and the clock pattern is obtained based on the determined position reference pattern.
  • the position reference pattern short axis direction polarity reversal detection step 2806 the boundary position in the short axis direction of the header between the central portion and the peripheral portion of the position reference pattern is obtained.
  • step 2807 of calculating the marker center upper boundary line and the marker center lower boundary line a straight line connecting the boundary positions in the minor axis direction of the header between the center part and the peripheral part of the adjacent position reference pattern is obtained. Therefore, the short axis direction discrimination position of each of the data pattern and the clock pattern is determined.
  • the determination position of the data pattern in the long axis direction is obtained, and the data pattern and the clock pattern in the short axis direction determination position determination step 2802 are combined with the data in the short axis direction.
  • the position of the pixel used for pattern discrimination is determined.
  • a clock pattern detection signal acquisition step 2808 pixel information of a pixel area where the clock pattern exists is acquired.
  • a clock pattern center level detection step 2809 the center level of the clock pattern region is detected from the pixel information acquired in the clock pattern detection signal acquisition step 2808.
  • the pixel information and the clock pattern center level detection step 2809 arranged in the major axis direction at the position in the minor axis direction of the clock pattern discrimination determined in the data pattern and clock pattern minor axis direction discrimination position determination step 2802. From the obtained center level, the clock pattern polarity change position (zero cross point) is obtained. In the polarity inversion period / number determination 2811, the interval and the number of the polarity change positions of the obtained clock pattern are obtained.
  • the correction processing step 2811 if there are locations where the interval is smaller than the assumed range and there are a large number, It is considered that a non-original clock pattern is detected and excluded, and conversely, if there are places where the interval is larger than the expected range and the number is small, there are places that were not detected due to defects etc. It is assumed that interpolation is performed based on the surrounding polarity change position.
  • the data pattern discrimination position determination step 2813 the major axis direction for discriminating the data pattern is obtained based on the polarity change position determined through the correction processing step 2811, and in the data pattern and clock pattern minor axis direction discrimination position determination step 2802. A pixel for determining the data pattern is determined in accordance with the obtained position in the minor axis direction.
  • the data pattern and the clock pattern are stored in the header from the data pattern based on the pixel information of the position obtained through the short axis direction determination position determination step 2802 and the data pattern long axis direction determination position determination step 2803. Determine the discriminant value of the data string.
  • the data pattern amplitude determination step 2814 the recorded pattern is based on the amplitude level of the pixel information at the position obtained through the data pattern and clock pattern short axis direction determination position determination step 2802 and the data pattern long axis direction determination position determination step 2803. Discriminate between on-pixel and off-pixel. Since the data pattern and the clock pattern are close to each other, the respective center levels can be regarded as equivalent.
  • the amplitude level of the pixel information is applied by using the center level obtained in the clock pattern center level detection step 2809 as a reference. Compare with.
  • the data decoding step 2815 the data string stored in the data pattern is decoded based on the result of the data pattern amplitude determining step 2814. .
  • the data string determined in the data decoding step 2815 is divided by the position and number determined at the time of recording to obtain a partial data string.
  • the partial data sequence obtained in the data division step 2816 is changed in order so as to restore the arrangement conversion processing in each header data sequence synthesis step 2708 at the time of recording, and the data stored in the header Get the discriminant value for a column.
  • the partial data strings subjected to the layout conversion process in the layout order restoration step 2817 do not necessarily have the same data pattern, and partial data strings determined from different data patterns may be combined.
  • the data patterns of Headers 1, 2, 3, and 4 storing four partial data strings of Part A, B, C, and D are arranged.
  • a partial data sequence obtained from Part A of Header 1 a partial data sequence obtained from Part B of Header 2, a partial data sequence obtained from Part C of Header 3, and a partial data sequence obtained from Part D of Header 4 You may combine.
  • correct storage information is acquired based on the discriminant value of each data string obtained in the header data string restoration step 2804.
  • the error correction step 2818 performs error correction processing in a format corresponding to the error correction encoding step 2706 performed at the time of recording on the discriminant value of each data string obtained in the header data string restoration step 2804.
  • a wrinkle error detection process corresponding to the format of the CRC code addition step 2705 at the time of recording is performed on the data string obtained as a result of the error correction step 2818.
  • correct data selection step 2820 a data string determined to be correct is selected from the discriminant value of each data string obtained in header data string restoration step 2804, and obtained through error correction step 2818 and error detection step 2819.
  • step 2817 for dividing each stored information the data string determined to be correct is divided for each information stored at the time of recording (for example, information indicating a pattern format or information for identifying page data).
  • the divided information is transmitted to the controller 89 via a memory element or a register.
  • the data stored in the page header can be reproduced by the flow shown in FIG.
  • a page header pattern is generated by the above-described page header generation flow of FIG. 5A and this pattern is reproduced by the reproduction flow of FIG. Identification can be performed easily and accurately.
  • the present invention is not limited to this, and the present invention can also be applied to a pattern of three or more values. I can do it.
  • the present invention can be applied not only to the angle multiplexing method but also to other methods such as a shift multiplexing method.
  • 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 by, for example, an integration means.
  • 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.
  • 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 the disk rotation angle, 101 ... Clock pattern part 102: Data pattern part 103 ... clock pattern 104 ... Data pattern 105 ... Clock pattern detection signal 106 ... Data pattern detection signal 81 ... access control means, 82... Light source driving means, 83... Servo signal generating means, 84 ... servo control means, 85 ... signal processing means, 86 ... signal generation means, 87 ... shutter control means, 88 ... disk rotation motor control means, 89 ...
  • Controller 90 ... Input / output control means, 91 ... External control device, 301 ... light source, 303 ... shutter, 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, 320 ... actuator, 321 ... lens, 322 ... lens, 323 ... actuator, 324 ... Mirror, 325 ... Photodetector 501 ... Light source, 502 ... Collimating lens, 503 ... Shutter, 504 ...

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  • Optical Recording Or Reproduction (AREA)

Abstract

La présente invention a pour objet, lors d'un traitement de lecture de mémoire holographique, d'exécuter facilement et précisément un traitement qui vérifie que des données de page détectées concernent une page qui comprend des données cibles prédéfinies, et un traitement qui identifie un format de données, lesquels sont exécutés avant de déterminer des données d'utilisateur. Un en-tête de page, qui contient des informations d'identification de données de page ou des informations d'identification de format de données, est prévu à l'intérieur de motifs des données de page. Un motif d'horloge sur lequel des pixels activés et des pixels désactivés sont répétés à une période constante est placé dans l'en-tête de page, le long d'un motif de données formant un motif unidimensionnel.
PCT/JP2013/069730 2013-07-22 2013-07-22 Support d'enregistrement optique d'informations, procédé d'enregistrement optique d'informations et procédé de lecture optique d'informations Ceased WO2015011745A1 (fr)

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JPH07307064A (ja) * 1994-05-11 1995-11-21 Canon Inc 光学的情報再生装置
JPH10307262A (ja) * 1997-03-05 1998-11-17 Olympus Optical Co Ltd ビデオマイクロスコープ
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Publication number Priority date Publication date Assignee Title
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