# US 2006/0215527 A1 · Holographic recording medium and recording and reproducing apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2006/0215527 A1 - Document ID: US20060215527A1 - Status: Published application - Kind: A1 - Application number: 11/190,589 - Filed: 2005-07-27 - Published: 2006-09-28 - Earliest claimed: 2005-03-22 - Assignees: Fujitsu Limited - Inventors: Akiyoshi Uchida; Toshikazu Kanaoka; Masakazu Taguchi - Web page: https://patentgrep.com/patent/US20060215527A1 ## CPC - G11B 7/00736: {Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information (sector headers or adresses in prepits G11B7/00745; address data in track wobble G11B7/24082)} - G11B 7/0065: Recording, reproducing or erasing by using optical interference patterns, e.g. holograms - G11B 7/00781: {Auxiliary information, e.g. index marks, address marks, pre-pits, gray codes} - G11B 7/24044: for storing optical interference patterns, e.g. holograms; for storing data in three dimensions [3D], e.g. volume storage (G11B7/24038 takes precedence) - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract A holographic recording medium is a medium which records and reproduces data by irradiation with an information beam and a reference beam. This medium includes a user region for recording user data; and a calibration region for storing calibration data for calibrating an element which determines a recording and reproducing characteristic of a recording and reproducing apparatus for recording and reproducing data on/from the recording medium. The calibration data stored in the calibration region includes pattern information for measuring the element determining the recording and reproducing characteristic of the recording and reproducing apparatus. ## Claims ### Claim 1 A holographic recording medium provided for holographic recording and reproduction which records and reproduces data by irradiation with an information beam and a reference beam, comprising: a user region for recording user data; and a calibration region for storing calibration data for calibrating an element which determines a recording and reproducing characteristic of a recording and reproducing apparatus for recording and reproducing data on/from the recording medium, wherein the calibration data stored in the calibration region includes pattern information for measuring the element determining the recording and reproducing characteristic of the recording and reproducing apparatus. ### Claim 2 (depends on 1) The holographic recording medium of claim 1, wherein the element which determines the recording and reproducing characteristic includes at least one of wavelength of the information beam or reference beam, an angle of incidence on a medium surface of the reference beam, and an area of a beam spot in the medium surface of the information beam or reference beam, and a plurality of pieces of pattern information having different element values by which reproduction characteristics preferable for the respective elements are obtained are stored in the calibration region. ### Claim 3 (depends on 1) The holographic recording medium of claim 1, wherein a plurality of pieces of pattern information related to wavelength of the information beam or reference beam are stored in the calibration region, in the case of irradiating a region in which a piece of the pattern information is stored with a beam having a specific wavelength, the pattern information can be reproduced at an S/N ratio higher than that in the case of irradiating the region with a beam having another wavelength, and a plurality of pattern information of different specific wavelengths are stored in the calibration region. ### Claim 4 (depends on 1) The holographic recording medium of claim 1, wherein a plurality of pieces of pattern information related to an angle of incidence of the reference beam are stored in the calibration region, in the case of irradiating a region in which a piece of the pattern information is stored with a beam having a specific angle of incidence, the pattern information can be reproduced at an S/N ratio higher than that in the case of irradiating the region with a beam having another angle of incidence, and a plurality of pattern information of different specific angles of incidence are stored in the calibration region. ### Claim 5 (depends on 1) The holographic recording medium of claim 1, wherein a plurality of pieces of pattern information related to an area of a beam spot of the information beam or reference beam are stored in the calibration region, in the case of irradiating a region in which a piece of the pattern information is stored with a beam having a specific beam spot area, the pattern information can be reproduced at an S/N ratio higher than that in the case of irradiating the region with a beam having another beam spot area, and a plurality of pattern information of different specific beam spot areas are stored in the calibration region. ### Claim 6 (depends on 3) The holographic recording medium of claim 3, wherein the plurality of pieces of pattern information include: one pattern information which can be reproduced at the highest S/N ratio when reproduced with a beam having a first wavelength determined in a design specification, and “n” pieces of pattern information which can be reproduced at the highest S/N ratio when reproduced with a beam having any of “n” wavelengths which are different from the first wavelength only by predetermined values. ### Claim 7 (depends on 4) The holographic recording medium of claim 4, wherein the plurality of pieces of pattern information include: one pattern information which can be reproduced at the highest S/N ratio when reproduced with a beam having a first incidence angle determined in a design specification, and “n” pieces of pattern information which can be reproduced at the highest S/N ratio when reproduced with a beam having any of “n” incidence angles which are different from the first incidence angle only by predetermined values. ### Claim 8 (depends on 5) The holographic recording medium of claim 5, wherein the plurality of pieces of pattern information include: one pattern information which can be reproduced at the highest S/N ratio when reproduced with a beam having a first beam spot area determined in a design specification, and “n” pieces of pattern information which can be reproduced at the highest S/N ratio when reproduced with a beam having any of “n” beam spot areas which are different from the first beam spot area only by predetermined values. ### Claim 9 (depends on 2) The holographic recording medium of claim 2, wherein the plurality of pieces of pattern information are recorded at an S/N ratio higher than that of data recorded on the user region. ### Claim 10 (depends on 2) The holographic recording medium of claim 2, wherein the plurality of pieces of pattern information are stored in different regions in the calibration region. ### Claim 11 (depends on 1) The holographic recording medium of claim 1, further comprising: a region for storing apparatus adjustment information indicative of a recording and reproduction condition peculiar to a recording and reproducing apparatus so as to be associated with user data recorded and reproduced by the recording and reproducing apparatus. ### Claim 12 (depends on 11) The holographic recording medium of claim 11, wherein the region for storing the apparatus adjustment information includes at least one of calibration result information, defect information of an optical part related to recording, and defect information of an optical part related to reproduction. ### Claim 13 A recording and reproducing apparatus comprising: a beam emitter for generating an information beam and a reference beam from a single light source; a recording member for recording data by irradiating a holographic recording medium with the information beam and the reference beam generated by the beam emitter; a reproducing member for reproducing the data recorded on the medium by irradiating the holographic recording medium with the reference beam; and a calibrator for calibrating an element which determines a recording and reproducing characteristic of the recording member or reproducing member by using calibration data recorded on the holographic recording medium. ### Claim 14 (depends on 13) The recording and reproducing apparatus of claim 13, wherein when numerical values of elements which determine the recording and reproducing characteristic of the recording member or reproducing member are different from each other, the calibration data recorded on the holographic recording medium includes a plurality of pieces of pattern information indicative of preferable reproduction characteristics for the respective different numerical values, and the calibrator includes: a reproduction section for reproducing the plurality of pieces of pattern information; a comparator for comparing a numerical value A of an element corresponding to pattern information indicative of the most preferable reproduction characteristic as a result of the reproduction with a reference value A0 of an element which is preset as a design specification of the recording and reproducing apparatus; and an element adjustor, when the numerical value A and the reference value A0 do not coincide with each other as a result of the comparison, for adjusting the beam emitter, reproducing member or recording member so that the numerical value of the element corresponding to the pattern information exhibiting the most preferable reproducing characteristic becomes the reference value A0. ### Claim 15 (depends on 13) The recording and reproducing apparatus of claim 13, further comprising: a recording controller for reading apparatus adjustment information peculiar to each of different recording and reproducing apparatuses and preliminarily recorded on the holographic recording medium and, on the basis of the apparatus adjustment information peculiar to the apparatus, reconstructing user data so that the user data is correctly recorded on the medium; and a reproduction controller for reading the apparatus adjustment information recorded on the medium and identification information of a recording and reproducing apparatus which has recorded user data recorded on the medium from the medium and reconstructing reproduced user data on the basis of apparatus adjustment information peculiar to the recording and reproducing apparatus specified by the read identification information. ### Claim 16 (depends on 15) The recording and reproducing apparatus of claim 15, wherein the apparatus adjustment information peculiar to an apparatus includes information specifying a defect position in the recording member or reproducing member, the recording controller includes a replacement section for moving data to be recorded in the defect position to a predetermined spare data region on the basis of the information specifying the defect position, and the reproduction controller includes a replacement reverse section for reconstructing user data by moving back the data moved to the predetermined spare data region in reproduced data to the defect position on the basis of the information specifying the defect position. ### Claim 17 (depends on 16) The recording and reproducing apparatus of claim 16, wherein the recording member includes a space modulator for generating space information corresponding to user data to be recorded and modulating the information beam, the apparatus adjustment information peculiar to an apparatus includes information specifying a defect position in the space modulator, the space modulator has a user data region of user data and a spare data region including a replacement position in which data to be recorded in a defect position is saved, and when information specifying a defect position in the space modulator exists, the replacement section moves data to be recorded in the defect position to a spare position associated with the defect position. ### Claim 18 (depends on 13) The recording and reproducing apparatus of claim 13, wherein an element which determines the recording and reproducing characteristic includes at least one of wavelength of the information beam or reference beam, an angle of incidence on a medium surface of the reference beam, and an area of a beam spot in the medium surface of the information beam or reference beam. ### Claim 19 (depends on 13) The recording and reproducing apparatus of claim 13, wherein the recording member includes a space modulator for generating space information corresponding to user data to be recorded and modulating the information beam. ### Claim 20 (depends on 13) The recording and reproducing apparatus of claim 13, wherein the reproducing member includes a photodetector for receiving a reproduction beam obtained by irradiating a medium with the reference beam.