WO2006123732A1 - Support d’enregistrement, procede d’enregistrement d’informations optiques, dispositif d’enregistrement d’informations optiques, procede de reproduction d’informations optiques, dispositif de reproduction d’informations optiques et procede de fabrication de support d’enregistr - Google Patents

Support d’enregistrement, procede d’enregistrement d’informations optiques, dispositif d’enregistrement d’informations optiques, procede de reproduction d’informations optiques, dispositif de reproduction d’informations optiques et procede de fabrication de support d’enregistr Download PDF

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Publication number
WO2006123732A1
WO2006123732A1 PCT/JP2006/309908 JP2006309908W WO2006123732A1 WO 2006123732 A1 WO2006123732 A1 WO 2006123732A1 JP 2006309908 W JP2006309908 W JP 2006309908W WO 2006123732 A1 WO2006123732 A1 WO 2006123732A1
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WIPO (PCT)
Prior art keywords
light
recording
interference fringes
recorded
control
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2006/309908
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English (en)
Japanese (ja)
Inventor
Katsumi Mizunoe
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Optware Corp
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Optware Corp
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Publication date
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Priority to JP2007516334A priority Critical patent/JP4844759B2/ja
Publication of WO2006123732A1 publication Critical patent/WO2006123732A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24035—Recording layers
    • G11B7/24044—Recording layers for storing optical interference patterns, e.g. holograms; for storing data in three dimensions [3D], e.g. volume storage
    • 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers

Definitions

  • the present invention relates to a recording medium on which interference fringes of information light and recording reference light are recorded on a hologram recording layer, a method for manufacturing the same, and an optical information recording method for recording interference fringes on a hologram recording layer of a recording medium
  • the present invention relates to an optical information recording apparatus, an optical information reproducing method and an optical information reproducing apparatus for reproducing information from a hologram recording layer on which interference fringes are recorded.
  • Holographic recording in which information is recorded on a recording medium using holography is generally performed by superimposing information light having image information and reference light inside the recording medium, and interference that can be generated at that time. This is done by writing stripes on the recording medium.
  • the image information is reproduced by diffraction by interference fringes by irradiating the recording medium with reference light.
  • volume holography is a method of writing interference fringes in three dimensions by actively utilizing the thickness direction of the recording medium.
  • Digital volume holography is a method that uses the same recording medium and recording method as volume holography.
  • the image information to be recorded is a computer-oriented holographic recording method limited to a binary digital pattern.
  • image information such as an analog picture is also digitized, developed into two-dimensional digital pattern information, and recorded as image information. During playback, the digital pattern information is read and decoded to restore the original image information for display.
  • An example of recording on the hologram recording layer by volume holography is that the information light carrying the information to be recorded and the recording reference light from the transparent substrate side so that interference fringes in the thickness direction are generated in the hologram recording layer.
  • information is recorded as a three-dimensional hologram by three-dimensionally fixing an interference fringe pattern in the hologram recording layer by irradiation for a predetermined time (Patent Document 1).
  • FIG. 8 is a schematic configuration diagram of a conventional hologram recording / reproducing apparatus 1.
  • the optical information recording / reproducing apparatus 1 in FIG. 8 includes a recording / reproducing light source 35, a beam expander 34, a polarization beam splitter 32, a spatial light modulator 33, a beam splitter 31, first and second relay lenses 29, 30, It has a dichroic mirror 28, an objective lens 26, a projection lens 36, a photodetector 37, and a servo reading element 24. Then, the disk-shaped recording medium 25 is rotated by the driving means 27.
  • FIG. 9 is an enlarged schematic view of the vicinity of the recording medium 25.
  • the recording medium 25 has a reflective layer 20, a gap layer 19, and recording / reproduction on a substrate 21 on which pits are recorded as servo information.
  • a wavelength selective reflection film 18, a hologram recording layer 17, and a protective layer 16 that reflect the use light 14 and transmit the servo light 15 are provided.
  • FIG. 9 shows a state in which the recording / reproducing light 14 and the servo light 15 are irradiated onto the recording medium 25 while converging in a conical shape by an objective lens 26 (not shown).
  • FIG. 10 is a schematic plan view of the recording medium 25 irradiated with the recording / reproducing light 14 and the servo light 15.
  • FIG. 10 shows a pit 3 for specifying the irradiation position of the recording / reproducing light 14 and the servo light 15, and an irradiation area (beam spot) 4 of the servo light 15 in the pit 3 and a hologram of the recording / reproducing light 14.
  • An irradiation area (beam spot) 22 at the bottom of the recording layer 17 is shown.
  • the servo light 15 is emitted from the servo reading element 24.
  • the dichroic mirror 28 has a wavelength selective reflection surface that transmits the recording / reproducing light 14 emitted from the recording / reproducing light source 35 and reflects the servo light 15.
  • the light is reflected toward 26 and irradiated onto the recording medium 25 by the objective lens 26.
  • the servo light 15 passes through the protective layer 16, the hologram recording layer 17, the wavelength selective reflection film 18, and the gap layer 19 as shown in FIG.
  • a beam spot 4 (see FIG. 10) is formed on the substrate 21 and is modulated and reflected by the pit 3 of the substrate 21.
  • the reflected servo light 15 passes again from the gap layer 19 to the protective layer 16, passes through the objective lens 26, is reflected by the dichroic mirror 28, and is detected by the servo reading element 24.
  • the beam spot 4 of the servo light 15 follows the pit 3 row, and the tracking and focusing of the irradiation position are controlled by the information of the pit 3 detected by the servo reading element 24.
  • the optical information recording / reproducing apparatus 1 reads the address to be recorded or reproduced based on the information of the pit 3 detected by the servo reading element 24, and irradiates the recording or reproducing position with the recording or reproduction position.
  • S-polarized recording / reproducing light 14 is emitted from the reproducing light source 35.
  • the recording / reproducing light 14 is enlarged in beam diameter by the beam expander 34 and reflected by the polarization beam splitter 32 toward the spatial light modulator 33.
  • a two-dimensional pattern of information to be recorded in the spatial light modulator 33 and a two-dimensional pattern of reference light are displayed, and information light and reference light for recording are generated as recording / reproducing light 14 for reproduction.
  • a two-dimensional pattern of reference light is displayed on the spatial light modulator 33 to generate reproduction reference light.
  • the recording / reproducing light 14 is converted to P-polarized light by the spatial light modulator 33, passes through the polarization beam splitter 32 and the beam splitter 31, and is an objective lens by the first and second relay lenses 29 and 30.
  • the image of the two-dimensional pattern displayed on the spatial light modulator 33 is transferred to the 26 pupil planes.
  • the recording / reproducing light 14 passes through the dichroic mirror 28 and is irradiated onto the recording medium 25 by the objective lens 26.
  • the recording / reproducing light 14 passes through the protective layer 16 and the hologram recording layer 17 of the recording medium 25 and forms a beam spot 22 (see FIG. 10) on the bottom surface of the hologram recording layer 17.
  • the recording / reproducing light 14 is reflected by the wavelength selective reflection film 18 and passes through the hologram recording layer 17 and the protective layer 16 again.
  • interference fringes formed by the interference between the information light which is the recording / reproducing light 14 and the recording reference light are recorded on the hologram recording layer 17 of the recording medium 25, and at the time of reproduction, the recording / reproducing light 14
  • the reproduction reference light interferes with the interference fringes recorded on the hologram recording layer 17 of the recording medium 25 to generate reproduction light.
  • the reproduction light generated from the hologram recording layer 17 passes through the object lens 26 and the dichroic mirror 38, and the first and second relay lenses 29, 3
  • the image of the two-dimensional pattern formed on the pupil plane of the objective lens 26 is transferred by 0, reflected by the beam splitter 31, projected onto the photodetector 37 by the projection lens 36, and the image of the two-dimensional pattern of the reproduction light is It is detected by the photodetector 37.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 11-311938
  • a hologram recording layer having a sufficiently large thickness compared to the interval between interference fringes is called a thick hologram, and is distinguished from a thin hologram having properties similar to a diffraction grating.
  • Thick holograms can, in principle, be reproduced only by the reproduction reference beam under exactly the same conditions as the recording reference beam used at the time of recording. If the conditions are different, the reproduction efficiency decreases rapidly.
  • the reproduction reference light is centered on the angle of incidence on the recording medium, the magnification in the hologram recording layer, and the optical axis as well as the two-dimensional pattern and irradiation position of the reference light displayed on the spatial light modulator 33.
  • the positional relationship in the rotation direction is preferably the same as the recording reference beam at the time of recording.
  • the irradiation position of the recording / reproducing light 14 is determined by reading the pit 3 with the servo light 15.
  • the diameter ( ⁇ D) of the beam spot 22 of the recording / reproducing light 14 is several hundred ⁇ m, whereas the diameter of the beam spot 4 of the servo light 15 is several ⁇ m (FIGS. 9 and 10). Is a schematic diagram for explanation, and does not accurately indicate the ratio of the spot diameters.) O
  • the beam diameter of the recording / reproducing light 14 is much higher than the beam diameter of the servo light 15. Even if the beam spot 22 of the recording / reproducing light 14 and the beam spot 4 of the servo light 15 overlap each other, the positional relationship is not the same.
  • the recording / reproducing light 14 and the servo light 15 are irradiated onto the recording medium from different light sources through different optical systems, strictly speaking, as shown in FIG. 9, the recording / reproducing light 14
  • the optical axis 12 of the servo and the optical axis 13 of the servo light 15 cannot be completely matched, resulting in a difference of ⁇ 0.
  • the center of the irradiation position of the recording / reproducing light 14 on the recording medium 25 and the center of the irradiation position of the servo light 15 are displaced in the order of submicrons. 9 and FIG.
  • the center of the recording / reproducing light 14 and the center of the servo light 15 are shifted by ⁇ r in the X direction and ⁇ t in the Y direction, and ⁇ t! .
  • the arrangement of the optical system, the magnification of the lens, and the like cannot be completely the same for each optical information recording / reproducing apparatus 1, and have a certain error range. For example, if the recording / reproducing light source 35 is slightly tilted, the incident angle or irradiation position of the recording / reproducing light 14 on the recording medium 25 is shifted, and if the servo reading element 24 is slightly tilted, the recording medium The irradiation position and incident angle of servo light 15 at 25 are shifted.
  • the magnification of the Fourier transform image of the recording / reproducing light 14 in the hologram recording layer is shifted, and the spatial light modulator 33 If it is slightly rotated with respect to the axis, the Fourier transform image of the recording / reproducing light 14 is rotated around the optical axis.
  • the recording state or the reproducing state of the recording / reproducing light and the servo light differs in a strict sense between different devices. Since the difference affects the playback efficiency, the device dependency is high and the versatility between devices is low.
  • the present invention provides a novel recording medium, an optical information recording method, an optical information recording device, an optical information reproducing method, and an optical information reproducing device for the purpose of enhancing versatility between devices in the optical information recording / reproducing device. provide.
  • the recording medium of the present invention is a recording medium on which information is recorded by interference fringes, and includes a hologram recording layer on which interference fringes are recorded, and control information on which control information reproduced by control light is recorded. And a plurality of reference marks that can be detected by the control light, and a plurality of interference fringes in which recording conditions are changed in association with the reference marks are recorded on the hologram recording layer.
  • the reference mark is a part of control information recorded in the control information layer in the recording medium.
  • the plurality of interference fringes are arranged by changing the relative positional relationship between the interference fringes and the reference marks associated with the interference fringes. Also good. In this case, it is preferable that each interference fringe has direction dependency in the diffraction efficiency in the plane direction of the recording medium. Further, the plurality of reference marks may be arranged by changing the positional relationship of the reference marks with respect to the interference fringe array that is normally recorded. Yes.
  • the plurality of interference fringes are recorded in a partial area of the recording medium.
  • the plurality of interference fringes can be reproduced by reproduction reference light having the same spatial modulation pattern.
  • the optical information recording method of the present invention is an optical information recording method for recording information on a recording medium on which information is recorded by interference fringes, and the recording medium is a program on which interference fringes are recorded.
  • a plurality of interference fringes are recorded on the hologram recording layer.
  • the reference mark is a part of control information recorded in the control information layer.
  • the plurality of interference fringes may change a relative positional relationship between each interference fringe and a reference mark associated with the interference fringe. .
  • the recording medium is arranged by changing the positional relationship of the reference marks with respect to the arrangement of interference fringes that are normally recorded, and perfectly follows the displacement of the arrangement of the plurality of reference marks. Instead, the plurality of interference fringes may be recorded.
  • the rotation angle around the optical axis of the recording light on which the interference fringes are recorded may be changed by changing the magnification of the recording light on which the interference fringes are recorded on the hologram recording layer. Good.
  • the optical information reproducing method of the present invention is an optical information reproducing method for reproducing information from a recording medium on which information is recorded by interference fringes, and the recording medium is a hologram on which interference fringes are recorded.
  • the hologram recording layer has a recording layer, a control information layer on which control information reproduced by the control light is recorded, and a plurality of reference marks that can be detected by the control light, and is associated with the reference mark.
  • a plurality of interference fringes are recorded, and the plurality of interference fringes are arranged by changing a relative positional relationship between each interference fringe and a reference mark associated with the interference fringe, and the control Irradiating the recording medium with reproduction light for reproducing interference fringes recorded in association with the use light and the reference mark, detecting the reference mark with the control light, and detecting the reference mark with the reproduction light.
  • Interference fringes The generated reproduction light is detected, a relative positional relationship between the control light and the reproduction light is detected from the detected reference mark and the detected reproduction light, and the control light and the reproduction light are detected. It is characterized by controlling the relative positional relationship of.
  • control light and the reproduction light are controlled by controlling timing information of the control light or the reproduction light or position information in the reproduced control information.
  • the relative positional relationship may be controlled.
  • another optical information reproducing method of the present invention is an optical information reproducing method for reproducing information from a recording medium on which information is recorded by interference fringes, wherein the recording medium records interference fringes.
  • a plurality of interference fringes are recorded on the hologram recording layer by changing the magnification of the recording light in the hologram recording layer, and the interference fringes recorded in association with the control light and the reference mark are reproduced.
  • the recording medium is irradiated with reproduction light, the reference mark is detected by the control light, the reproduction light generated by the interference fringe force is detected by the reproduction light, and the detected reference mark and the detected reproduction light are detected.
  • the magnification of the reproduction light in the hologram recording layer is detected, and the magnification of the reproduction light in the hologram recording layer is controlled.
  • another optical information reproducing method of the present invention is an optical information reproducing method for reproducing information from a recording medium on which information is recorded by interference fringes, the interference fringes being recorded on the recording medium.
  • a hologram recording layer that is recorded, a control information layer on which control information reproduced by the control light is recorded, and a plurality of reference marks that can be detected by the control light, and is associated with the reference mark.
  • a plurality of interference fringes are recorded on the hologram recording layer by changing the rotation angle around the optical axis of the recording light, and the interference fringes recorded in association with the control light and the reference mark are reproduced.
  • the recording medium is irradiated with reproduction light for
  • the reference mark is detected by the control light, the reproduction light generated by the interference fringe force is detected by the reproduction light, and the optical axis of the reproduction light is determined from the detected reference mark and the detected reproduction light.
  • a rotation angle around the center is detected, and the rotation angle around the optical axis of the reproduction light is controlled.
  • the reference mark is a part of control information recorded in the control information layer.
  • the plurality of interference fringes are recorded in a partial area of the recording medium, and after the plurality of interference fringes are reproduced in a part of the recording medium. Information is preferably reproduced in other areas of the recording medium.
  • the optical information reproducing apparatus of the present invention includes means for generating reproduction light for reproducing interference fringes recorded on a recording medium, control information and a reference mark recorded on the recording medium.
  • a second detection means for detecting the control information and reference marks reproduced by the control light; and the second detection.
  • a relative positional relationship between the control light and the reproduction light is detected from the reference mark detected by the means and the reproduction light detected by the first detection means, and the control light and the reproduction are detected. Control the relative position with the light And control means for controlling.
  • control means is configured to switch between the control light and the reproduction light by a displacement means that displaces the reproduction optical system or a part of the control optical system.
  • a displacement means that displaces the reproduction optical system or a part of the control optical system.
  • another optical information reproducing apparatus of the present invention includes means for generating reproduction light for reproducing interference fringes recorded on a recording medium, and control information and reference marks recorded on the recording medium.
  • First detection means for detecting reproduction light generated from the interference fringes, second detection means for detecting the control information and reference marks reproduced by the control light, and hologram recording on the recording medium
  • a hologram of the reproduction light from the displacement means for changing the magnification of the reproduction light in the layer, the reference mark detected by the second detection means, and the reproduction light detected by the first detection means In the recording layer
  • control means for changing the magnification of the reproduction light in the hologram recording layer by the displacement means.
  • another optical information reproducing apparatus of the present invention includes means for generating reproduction light for reproducing interference fringes recorded on a recording medium, and control information and reference marks recorded on the recording medium.
  • First detection means for detecting reproduction light generated from the interference fringes, second detection means for detecting the control information and reference mark reproduced by the control light, and light of the reproduction light
  • An optical axis of the reproduction light is centered from a displacement means for changing a rotation angle about the axis, a reference mark detected by the second detection means, and a reproduction light detected by the first detection means.
  • the rotation angle Control means for changing a rotation angle about the optical axis of the reproduction light by a positioning means.
  • the optical information recording method of the present invention is an optical information recording method for recording information on a recording medium on which information is recorded by interference fringes, and the recording medium is a program on which interference fringes are recorded.
  • the hologram recording layer is associated with the reference marks.
  • a plurality of interference fringes are recorded. The interference fringes are arranged by changing the relative positional relationship between each interference fringe and the reference mark associated with the interference fringe, and the interference light recorded in association with the control light and the reference mark.
  • the recording medium is irradiated with reproduction light for reproducing fringes, the reference mark is detected by the control light, the reproduction light generated from the interference fringes is detected by the reproduction light, and the detected reference After detecting the relative positional relationship between the control light and the reproduction light from the mark and the detected reproduction light, and controlling the relative positional relationship between the control light or the reproduction light Further, it is characterized in that recording fringes are recorded on the hologram recording layer by irradiating recording light using the same optical system as the reproducing light.
  • the optical information recording method of the present invention is an optical information recording method for recording information on a recording medium on which information is recorded by interference fringes, and the recording medium is a program on which interference fringes are recorded.
  • a recording layer, a control information layer on which control information reproduced by the control light is recorded, and a plurality of reference marks detectable by the control light, and a hologram of the recording light associated with the reference mark A plurality of interference fringes are recorded on the hologram recording layer by changing the magnification in the recording layer, and reproduction light for reproducing the interference fringes recorded in association with the control light and the reference mark is used.
  • the recording medium Irradiating the recording medium, detecting the reference mark by the control light, detecting the reproduction light generated by the interference fringe force by the reproduction light, and from the detected reference mark and the detected reproduction light, After detecting the magnification of the reproduction light in the hologram recording layer and controlling the magnification of the reproduction light in the hologram recording layer, the recording light is irradiated using the same optical system as the reproduction light. An interference fringe is recorded on the hologram recording layer.
  • the optical information recording method of the present invention is an optical information recording method for recording information on a recording medium on which information is recorded by interference fringes, and the recording medium is a program on which interference fringes are recorded.
  • a plurality of interference fringes are recorded on the hologram recording layer by changing the rotation angle about the axis, and the interference fringes recorded in association with the control light and the reference mark are reproduced.
  • the recording medium is irradiated with reproduction light, the reference mark is detected with the control light, and the interference fringes are detected with the reproduction light.
  • the generated reproduction light is detected, the rotation angle around the optical axis of the reproduction light is detected from the detected reference mark and the detected reproduction light, and the rotation angle around the optical axis of the reproduction light is detected.
  • the same optical system as the reproducing light is used to irradiate the recording light to record interference fringes on the hologram recording layer.
  • the reference mark is a part of control information recorded in the control information layer.
  • the plurality of interference fringes are recorded in a partial area of the recording medium, and the plurality of interference fringes are formed in a part of the recording medium. After reproduction, it is preferable to record interference fringes in other areas of the recording medium.
  • the optical information recording apparatus of the present invention records an interference fringe on a recording medium, generates a recording / reproducing light for reproducing the interference fringe recorded on the recording medium, and the recording medium Means for generating control light for reproducing the recorded control information and reference marks, a recording / reproducing optical system for irradiating the recording medium with the recording / reproducing light, and the control light on the recording medium Irradiating control optical system, first detection means for detecting the reproduction light generated by the interference fringe force by the recording / reproducing light, and detecting the control information and the reference mark reproduced by the control light From the second detection means, the reference mark detected by the second detection means, and the reproduction light detected by the first detection means, the control light and the recording / reproduction light are relative to each other. To detect Characterized by chromatic and control means for controlling the relative positional relationship between patronage light and the reproducing light.
  • control means may transmit the control light and the control light by a displacement means for displacing the recording / reproducing optical system or a part of the control optical system.
  • the control light may be controlled by controlling the relative position relationship with the recording / reproducing light, the timing of irradiating the control light or the recording / reproducing light, or position information in the reproduced control information. Control the relative positional relationship between the light and the recording / reproducing light.
  • the optical information recording apparatus of the present invention records an interference fringe on a recording medium, generates a recording / reproducing light for reproducing the interference fringe recorded on the recording medium, and the recording medium.
  • Means for generating control light for reproducing the recorded control information and reference mark, an optical system for irradiating the recording medium with the recording / reproducing light, and optical for irradiating the recording light with the control light A first detection means for detecting reproduction light generated from the interference fringes by the recording / reproducing light, and a second detection for detecting the control information and the reference mark reproduced by the control light.
  • Control means for detecting the magnification of the recording / reproducing light in the hologram recording layer and changing the magnification of the recording / reproducing light in the hologram recording layer by the displacing means. Characterized in that it.
  • the optical information recording apparatus of the present invention records an interference fringe on a recording medium, generates a recording / reproducing light for reproducing the interference fringe recorded on the recording medium, and the recording medium.
  • Means for generating control light for reproducing the recorded control information and reference mark, an optical system for irradiating the recording medium with the recording / reproducing light, and optical for irradiating the recording light with the control light A first detection means for detecting reproduction light generated from the interference fringes by the recording / reproducing light, and a second detection for detecting the control information and the reference mark reproduced by the control light.
  • a displacement means for changing a rotation angle about the optical axis of the recording / reproducing light, a reference mark detected by the second detecting means, and a reproducing light detected by the first detecting means, From the recording / reproducing light Control means for detecting a rotation angle about the optical axis of the recording medium and changing the rotation angle about the optical axis of the recording / reproducing light by the displacement means.
  • a plurality of interference fringes are recorded in a predetermined arrangement on the hologram recording layer, and a plurality of reference marks are recorded on the hologram recording layer on which the plurality of interference fringes are recorded.
  • a control information layer having a plurality of reference marks and a plurality of interference fringes in association with each other.
  • the hologram recording layer when recording the plurality of interference fringes, has a plurality of reference marks having the same arrangement as the predetermined arrangement.
  • the control information layer is combined.
  • the optical information recording / reproducing apparatus using the recording medium can be determined in step (1). For this reason, it is possible to unify the recording / reproducing conditions between different devices, and the versatility between the devices can be improved.
  • the optical information recording method of the present invention it is possible to record a plurality of interference fringes on the hologram recording layer by changing the recording condition in association with the reference mark, and the recorded recording medium is described above. As described above, conditions for recording / reproducing conditions can be determined, and versatility between apparatuses can be improved.
  • the interference fringe force recorded in association with the reference mark is also a reproduction condition. Conditioning can be performed and versatility between devices can be improved.
  • the optical information recording method or the optical information recording apparatus of the present invention it is possible to determine the recording conditions of the interference fringe force recording conditions recorded in association with the reference marks, and recording is always performed under constant conditions. Therefore, versatility between devices can be improved.
  • a control information layer having a plurality of reference marks is placed on each of the plurality of reference marks and each of the interference fringes. Since these are linked in association, a recording medium having a plurality of interference fringes associated with a plurality of reference marks can be easily obtained. Other effects of the present invention will be described in the embodiments.
  • FIG. 1 (A) is a schematic plan view of a recording medium of the present invention, and (B) is a schematic cross-sectional view.
  • FIG. 2 (A) to (C) are schematic cross-sectional views each showing one embodiment of a control information layer in the recording medium of the present invention.
  • FIG. 5 is a schematic cross-sectional view of a recording medium recorded by changing the focal position of the recording light in the thickness direction of the recording medium.
  • FIG. 7 is a schematic configuration diagram of an optical information recording / reproducing apparatus according to the present invention.
  • FIG. 8 is a schematic configuration diagram of a conventional optical information recording / reproducing apparatus.
  • FIG. 10 is a schematic plan view of a recording medium irradiated with recording / reproducing light and servo light.
  • FIG. 11 (A) and (B) are schematic plan views of the recording medium showing an arrangement in which the positional relationship between the reference mark and the interference fringe is changed in the oblique direction.
  • FIG. 12 (A) to (C) are schematic plan views of the recording medium in which the positional relationship of the reference marks is changed.
  • FIG. 13 (A) to (D) are interference fringes whose diffraction efficiency has direction dependency.
  • FIG. 14 (A) and (C) are diagrams showing spatial modulation patterns of information light and recording reference light for forming an interference fringe whose diffraction efficiency has direction dependency, and (B) Diagram showing the direction dependency of diffraction efficiency
  • FIG. 15 is a diagram showing an embodiment of a method for manufacturing a recording medium
  • FIG. 1 (A) is a schematic plan view of a recording medium 101 of the present invention, and (B) is a schematic cross-sectional view thereof.
  • the recording medium 101 includes a hologram recording layer 107 on which interference fringes are recorded, a control information layer 103 on which control information is recorded, and a plurality of reference marks 109a to 109h. Are recorded with a plurality of interference fringes 110a to 110h in which the recording conditions are changed in association with the reference marks 109a to 109h.
  • the recording medium 101 in FIG. 1 includes a substrate 102, a first gap layer 104, a wavelength selective reflection layer 105, a second gap layer 106, and a protective layer 108.
  • the force is not limited to the force disk shape showing the disk-shaped recording medium 101.
  • a rectangular card shape may be used.
  • the hologram recording layer 107 is for recording interference fringes between information light and a recording reference wave, and particularly preferably a material that is sensitive to recording / reproducing light and not sensitive to control light. Good.
  • a photopolymer material can be used as the hologram recording layer 107. If a photopolymer-based material sensitive to green and blue light is used as the material of the hologram recording layer 107, green or blue light is used as recording / reproducing light, and other wavelengths are used as control light. For example, red light may be used.
  • the hologram recording layer 107 is not limited to a photopolymer material! /.
  • control information reproduced by the control light is recorded.
  • the control information layer 103 may be a recording-and-reproducing information that is pre-recorded and information-recorded. Examples of control information include servo address information for recording / reproducing light, recording medium identification information indicating the capacity and structure of the recording medium, and the like.
  • FIGS. 2A to 2C are schematic cross-sectional views of the recording medium 101 when a layer in which pits are formed in advance is used as the read-only control information layer 103.
  • information can be reproduced by a change in the reflectance or transmittance of the control light 15 due to the unevenness of the pits.
  • a reflective layer as a part of the control information layer 103 when reproducing information by a change in reflectance or detecting a change in transmittance on the incident surface side. Concavities and convexities are formed on the surface of the substrate 102, and a reflective layer may be formed on the uneven surface as necessary to form pits.
  • a layer for forming pits may be formed on the substrate 102 and etched.
  • a configuration in which irregularities are formed and a reflective layer is formed on the irregular surface can be used if necessary.
  • servo address information, identification information of the recording medium 101, and the like can be recorded beforehand.
  • FIG. 2 (A) is a schematic cross-sectional view of a hologram recording medium 101 in which a concavo-convex shape is formed on the surface of the substrate 102 and a reflective layer 111 is formed on the concavo-convex surface to constitute a reflective control information layer 103.
  • FIG. 2B is a schematic cross-sectional view of the hologram recording medium 101 in which the control information layer 103 is formed by forming the metal layer 112 on the substrate 102 and etching by photolithography to form the hole 112a.
  • the control information layer 103 composed of the metal layer 112 and the hole 112a in FIG. 2B can be used as both the reflective control information layer 103 and the transmissive control information layer.
  • FIG. 2 (C) shows an uneven shape formed on the surface of the substrate 102 and the transmission control information layer 103 is formed.
  • 3 is a schematic cross-sectional view of a configured hologram recording medium 101.
  • FIG. 2C the surface of the substrate 102 functions as the control information layer 103.
  • control information layer 103 As the control information layer 103 that can be recorded and reproduced, an organic dye layer, a phase change layer, or the like can be used.
  • the control information layer 103 is an organic dye layer, information can be recorded only once, and pits can be formed by decomposing the dye with laser light. The formed pits can reproduce information by changing the reflectance or transmittance of the pits as in the read-only layer.
  • control information layer 103 is a phase change layer
  • information can be rewritten, and the crystalline structure and the amorphous portion are formed by changing the crystal structure of the phase change layer by heating with laser light.
  • information can be recorded by the difference in reflectance or transmittance between the crystalline part and the non-crystalline part.
  • the reference marks 109a to 109h serve as a reference for specifying the position on the recording medium 101, and may be any marks that can be detected by the control light. It is preferable to use a part of the control information recorded in the control information layer 103 as the reference marks 109a to 109h. For example, pits as address information are used as reference marks, interference fringes are recorded in association with the pits, or control information recorded in a system area provided separately from the area on the recording medium 101 where normal information is recorded. As a reference mark, interference fringes may be recorded in association with the pit. In this case, a plurality of interference fringes 110 for determining conditions can be recorded without reducing the recording capacity of normal information.
  • an identifier that can be detected by the control light may be provided separately from the control information.
  • a pit as a reference mark is separately formed on the control information layer 103, a reference mark layer is provided, or a seal that selectively reflects control light on the protective layer 108 is attached to form a reference mark.
  • the reference mark may be printed by selectively printing ink that reflects the control light.
  • the plurality of interference fringes 110a to: L lOh is provided for determining the condition relating to the recording reference light or the reproduction reference light of the recording / reproducing apparatus, and is a reference for recording each interference fringe.
  • the recording conditions related to light are changed.
  • the plurality of interference fringes 110a to: L lOh is formed by interference of information light and recording reference light.
  • the spatial modulation pattern of the information light for recording each interference fringe is the same, and the spatial modulation pattern of the recording reference light for recording each interference fringe is the same. It is preferable that By doing so, it is possible to detect the influence on the reproduction light due to the change in the recording condition without considering the influence on the reproduction light due to the difference in the spatial modulation pattern of the information light or the recording reference light. You can make a condition. Further, if the recording modulation reference light has the same spatial modulation pattern, it can be reproduced with the same spatial modulation pattern reproduction reference light, so there is no limitation on the switching time of the spatial modulation pattern, and conditions are determined more quickly. be able to.
  • each of the interference fringes 110a to 110h preferably has direction dependency in the diffraction efficiency in the plane direction of the recording medium 101. For this reason, it is preferable to use a spatial modulation pattern of information light or a spatial modulation pattern of recording reference light whose diffraction efficiency has direction dependency.
  • the interference fringe 110 being recorded in association with the reference mark 109 indicates that the interference fringe 110 is positioned by the reference mark 109 detected by the control light 15.
  • the interference fringe 110a is recorded in association with the reference mark 109a.
  • the control light detects the reference mark 109a
  • calculate the time when the recording medium reaches the position again and record the interference fringe 11 Oa by irradiating the recording light 14 at the position of the reference mark 109a.
  • the interference fringe 110a is recorded in association with the reference mark 109a.
  • the control light detects the reference mark 109a and then the recording light 14 is emitted after a specific time has passed to record the interference fringe 110a
  • the interference fringe 110a is recorded in association with the reference mark 109a. Will be.
  • the interference fringe 110 may be recorded in association with the reference mark 109a.
  • the reference marks may be associated afterwards.
  • a relative position between the interference fringes and a reference mark associated with the interference fringes Relationship (relative positional relationship between the irradiation position of the recording / reproducing light and the irradiation position of the control light), the magnification of the recording light for recording the interference fringes in the hologram recording layer, and the light of the recording light for recording the interference fringes
  • FIG. 3 is a diagram for explaining a part of the influence caused by the change of the recording condition.
  • Fig. 3 (A) shows the ideal relationship between the recording / reproducing light and the control light.
  • bright spots 116 are also generated at equal intervals due to diffraction caused by the spatial modulation pattern of the recording / reproducing light.
  • FIG. 3B shows a case where the irradiation position of the control light and the irradiation position of the recording / reproducing light in the plane direction of the recording medium are changed.
  • the positional force of the interference fringe 110a (dotted line) in the ideal state is also shifted, and the relative positional relationship between the interference fringe 110b and the reference mark 109b changes. This can be changed, for example, by tilting the optical axis of the recording / reproducing light or the control light emitted from the light source.
  • the relationship between the relative irradiation positions can be changed by controlling the timing of emitting the light source light of the recording / reproducing light and the control light or the position information in the reproduced control information.
  • FIG. 3C shows the case where the magnification of the recording light in the hologram recording layer is changed, and the magnification of the interference fringe 110c changes. This can be changed, for example, by changing the magnification of the pair of relay lenses.
  • FIG. 3 (D) shows a case where the rotation angle around the optical axis of the recording light is changed.
  • the spatial modulation pattern By rotating the spatial modulation pattern, the bright spot 116 in the interference fringe l lOd is rotated. Are recorded. This can be changed, for example, by rotating the spatial light modulator with respect to the optical axis of the recording / reproducing light.
  • FIG. 3 (E) shows a case where the position of the spatial modulation pattern in the recording light has changed, and the position of the bright spot 116 in the interference fringe l lOd has changed. This can be changed, for example, by translating the spatial light modulator in a direction perpendicular to the optical axis of the recording / reproducing light.
  • FIG. 4 is a schematic plan view of the recording medium in which the interference fringes 110 are recorded by changing the positional relationship in the plane direction of the recording medium with respect to the reference mark 109.
  • the reference mark 109 may be arranged on a circular or spiral track that does not need to be arranged on a straight line.
  • the layout may be used.
  • the upper row shifts the interference fringes 110a-g in the arrangement direction (the horizontal direction of the paper) with respect to the arrangement 117 of the plurality of reference marks 109a-g.
  • a shift in the positional relationship of the control light can be detected.
  • the lower row shifts the interference fringes 110h to n in the direction orthogonal to the upper row (vertical direction on the paper) with respect to the array 117 of the plurality of reference marks 109h to n. It is possible to detect deviations in the positional relationship. It is preferable to use both the upper and lower stages because the positional relationship in the planar direction of the recording medium can be grasped within a certain area.
  • the horizontal direction can be the circumferential direction and the vertical direction can be the radial direction.
  • the circumferential direction is the direction that advances when the recording medium rotates during recording or reproduction.
  • the interference fringes are arranged in the circumferential direction and when reproducing. Then, the interference fringes arranged in the circumferential direction are sequentially reproduced.
  • each interference fringe 110a-n has a plurality of reference mark arrays 117a with respect to the reference marks 109a-n associated with the interference fringes.
  • the interference fringes 110a-g are shifted in the diagonally left direction with respect to the arrangement 117a of the reference marks 109a-g
  • FIG. 11B shows the arrangement 117a of the reference marks 109h-n. Interference fringes 110h to n are shifted in the diagonally right direction.
  • the arrangement 117a of the reference marks 109a to 109n is linear, but it may be curved corresponding to a track on a disk-shaped recording medium. In this case, place it diagonally to the tangent at the position of each fiducial mark.
  • FIG. 4 a plurality of reference marks 109a-n are arranged in a line at regular intervals, and a plurality of interference fringes 110a-n are recorded with the positional relationship changed with respect to this arrangement.
  • a plurality of interference fringes 110a to 110n are arranged at regular intervals.
  • the positional relationship between 109a to n may be changed, and as shown in FIG. 12C, all of the plurality of reference marks 109a to 109g and the plurality of interference fringes 11Oa to g
  • the positional relationship may be changed with respect to the arrangement of the plurality of interference fringes.
  • the arrangement 117b of the plurality of interference fringes 110a to n is constant, like the arrangement of the plurality of interference fringes recorded normally. They are arranged on a straight line or arc at intervals of.
  • the arrangement 117c (shown by dotted lines) of the plurality of reference marks 109a to 109g changes the positional relationship in the direction perpendicular to the arrangement 117b of the plurality of interference fringes.
  • the plurality of reference marks 109h to 109i are arranged with their positional relationship changed in the arrangement direction with respect to the arrangement 117b of the plurality of interference fringes.
  • the plurality of interference fringes 110o to u and the plurality of reference marks 109 ⁇ to u are also arranged in a plurality of interference fringe arrangement 117b (shown by dotted lines). They are arranged in different directions in the direction perpendicular to each other. However, the amount of displacement differs between the plurality of interference fringes 110o to u and the plurality of reference marks 109o to u.
  • an array 117c of a plurality of reference marks 109o to u is indicated by a dotted line
  • an array 117d of a plurality of interference fringes 110o to u is indicated by a broken line.
  • Figs. 12 (A) to 12 (C) when a positional deviation is detected by a plurality of interference fringes 110a-u, reproduction is performed along the arrangement of the reference marks 109a-u, thereby recording.
  • Reproduction light 1 The relative positional relationship between the 14 irradiation positions and the irradiation position of the control light 115 can be detected.
  • the positional relationship of the reference marks in the plane direction of the recording medium is changed.
  • the positional relationship of the reference marks may be changed in the thickness direction of the recording medium.
  • a plurality of interference fringes are recorded along the reference marks in FIGS. 12 (A) to 12 (C), and at the time of reproduction, reproduction reference light is applied along the plurality of interference fringe arrays 117b that are normally recorded. Even if it is irradiated, the relative positional relationship between the irradiation position of the recording / reproducing light 114 and the irradiation position of the control light 115 can be detected.
  • each interference fringe 110 has a direction of diffraction efficiency in the plane direction of the recording medium. It is preferable to have dependency.
  • 13A to 13D show the reproducible range 119 of each interference fringe when the interference fringe 110 is recorded by changing the positional relationship in the plane direction of the recording medium with respect to the reference mark 109.
  • Figures 13 (A) and (B) show the case where the diffraction efficiency is isotropic with no direction dependence
  • Figures 13 (C) and (D) show the diffraction efficiency with direction dependence. This is the case with anisotropy.
  • interference fringes 110a to g are recorded in a shifted manner in the arrangement direction with respect to the arrangement 117 of the plurality of reference marks 109a to 109g, as in the upper part of FIG. Being!
  • FIG. 13A when the diffraction efficiency is isotropic, the reproducible range 1 19a-g of each interference fringe is circular.
  • FIG. 13 (B) is a collection of the reproducible ranges 119a to g of FIG. 13 (A) with reference mark 109 as a reference, and the set portion 119X (the hatched area) is shown in FIG. This is an area in which the positional deviation between the reproduction light and the control light can be grasped by the plurality of interference fringes 110a to 110g in (A).
  • the collection portion 119X is irradiated with reproduction light
  • at least one of the interference fringes 110a to 110g is reproduced, and based on the reproduced information, the positional relationship shift in the arrangement direction is grasped. Can be controlled.
  • FIG. 13B even if the reproduction light is irradiated to the position X where the reproduction light and the control light are shifted in the direction orthogonal to the arrangement direction, the interference fringes cannot be reproduced and the positional deviation cannot be grasped.
  • the reproducible ranges 1 19 a to 1 19 g of the respective interference fringes are not circular but deformed.
  • the reproducible ranges 119a to 119g are vertically long ellipses, and the selectivity in the direction orthogonal to the arrangement direction is high, and the selectivity in the arrangement direction is high.
  • the diffraction efficiency of the interference fringes in FIG. 13 (C) decreases sharply in the arrangement direction and gradually decreases in the direction orthogonal to the arrangement direction.
  • FIG. 13 (D) is a collection of the reproducible ranges 119a-g of FIG. 13 (C) with reference mark 109 as a reference, and the set portion 119Z (the hatched area) is This is an area in which the positional deviation between the reproduction light and the control light can be grasped by the plurality of interference fringes 110a to 110g in FIG.
  • the set portion 119Z the hatched area
  • each reproducible range 119a to 119g has a low selectivity in the direction orthogonal to the arrangement direction, the positional relationship in the arrangement direction can be grasped more widely and over the range. For example, even when the reproduction light is irradiated to the position X that could not be grasped in FIG. 13B, the positional deviation in the arrangement direction can be grasped.
  • the alignment can be performed while maintaining the alignment accuracy.
  • the time required can be shortened.
  • the interference itself between the information light for recording the interference fringe and the recording reference light should have direction dependency!
  • the spatial frequency is different in a specific direction, not in a plane direction, and in a specific direction. If you use it.
  • FIG. 14 (A) and 14 (C) are examples of embodiments of the spatial modulation pattern of information light and the spatial modulation pattern of recording reference light, respectively.
  • FIG. 14 (B) is an example of FIG. 14 (A). This is a reproduced image when the interference fringes recorded by the information light and the recording reference light are reproduced while shifting the position.
  • X and Y in Fig. 14 (B) are the coordinate axes shown on the right side of Fig. 14 (A). is there.
  • the spatial modulation pattern 140 of the information light has four squares arranged in an intersecting manner at the center, and four spaced apart by the same distance in the four directions in the XY direction. This is a shape in which squares are arranged. For this reason, the spatial modulation pattern 140 of the information light is symmetric with respect to the X direction and the Y direction, and the frequency components in the X direction and the Y direction are equal.
  • the spatial modulation pattern 141 of the recording reference light has a shape in which the central force extends linearly in the Y direction around the information light, and the frequency component in the Y direction is high, and the frequency component in the Y direction is high. Low.
  • the interference fringes recorded by the information light and the recording reference light in FIG. 14 (A) move the irradiation position of the reproduction light by 9 m in the X direction. Even if it is, the spatial modulation pattern of the reproduction light, that is, the force that can reproduce the five squares arranged crossing the center and the four squares spaced apart from each other, is moved 9 ⁇ m in the Y direction. The spatial modulation pattern of the playback light cannot be confirmed and playback is not possible.
  • the interference fringes recorded by the information light and the recording reference light in FIG. 14 (A) are low and selective in the X direction, and highly selective in the Y direction. It has direction dependency of diffraction efficiency. For this interference fringe, it is preferable to record with the positional relationship shifted in the Y direction.
  • the interference fringes reproduced in FIG. 14 (B) are interference fringes when the information light and recording reference light in FIG. 14 (A) are irradiated to converge on the recording medium by the objective lens, This is due to the interference between the Fourier-transformed images of the spatial modulation pattern shown in Fig. 14 (A).
  • FIG. 5 is a schematic cross-sectional view of a recording medium that is recorded by sequentially changing the focal position 114a of the recording light 114 that records the interference fringes 110o to 110q in the thickness direction of the recording medium.
  • Each interference fringe 110o-q is associated with a respective reference mark 109o-q.
  • a shift between the focal position 114a of the recording / reproducing light 114 and the focal position 115a of the control light 115 can be detected from the plurality of interference fringes 110o to q in FIG.
  • the recording / reproducing light 114 is recorded on the hologram recording layer.
  • the magnification can be detected.
  • Fig. 3 (D) if the interference fringes are sequentially recorded by gradually changing the rotation angle around the optical axis of the recording light, the rotational direction of the spatial modulation pattern relative to the optical axis can be detected.
  • Fig. 3 (E) if the interference fringes are sequentially recorded by gradually changing the position of the spatial modulation pattern in the recording light, the position of the spatial modulation pattern in the direction orthogonal to the optical axis is determined. It can be detected.
  • the interference fringes are sequentially recorded by changing the wavelength of the recording light, the wavelength error of the light source can be detected. Further, if the interference fringes are sequentially recorded by changing the incident angle of the recording light, the error of the incident angle of the recording light in each apparatus can be detected.
  • the plurality of interference fringes 110 are recorded for condition determination and may be recorded in a partial area of the recording medium. In particular, if recording is performed in an area (for example, a system area) provided separately from the area for recording normal information, a plurality of interference fringes 110 for recording conditions are recorded without reducing the recording capacity of normal information. be able to.
  • the irradiation position of the reproduction light is fixed if a plurality of interference fringes are arranged on the same track provided in the circumferential direction of the recording medium.
  • a plurality of interference fringes can be reproduced simply by rotating the recording medium, which is efficient. For example, if interference fringes are recorded without overlapping on a circle with a radius of 23 mm, the diameter of the interference fringes is 200 ⁇ m, so 722 interference fringes can be recorded. Therefore, conditions can be determined 722 times in one round, and can be performed reliably in a short time.
  • the plurality of interference fringes 110a to 110h are arranged at equal intervals on the same track in the system region 101a near the center, and are rotated once while being reproduced under the same irradiation conditions. It is possible to determine the conditions.
  • FIG. 6 is a diagram showing a change in reproduction light when a plurality of interference fringes are reproduced under the same reproduction condition.
  • the horizontal axis 6 is related to the reference mark
  • the vertical axis 9 is an amount related to the reproduction level of the interference fringes, for example, light quantity, SNR, error rate, and the like.
  • Curve 7 and song Line 8 was taken with a different device. From curve 7 and curve 8, the trend in the regenerated equipment can be grasped. In other words, curve 7 and curve 8 gradually increase in playback level from a reference mark with almost zero playback level, the playback level becomes maximum at a certain reference mark, and then gradually decreases. Therefore, it can be understood that the condition for recording the interference fringes recorded in association with the reference mark having the maximum reproduction level is the closest to the irradiation condition of the recording / reproducing apparatus.
  • the recording medium in FIG. Fig. 6 explains the reconstructed light when the is reproduced.
  • the reproduction light is irradiated when the control light detects the reference marks 109a and 109h, almost no reproduction is performed from the interference fringes 110a and 110h, and the reproduction level becomes almost zero.
  • the interference fringes 110b and 110i increase interference more than the interference fringes 110a, so that the reproduction level increases. Further, when the reproduction light is irradiated when the control light detects the reference marks 109c and 109j, the interference fringes 110c and 110j further interfere with each other, so that the reproduction level increases. If the reproduction light is emitted when the control light detects the reference marks 109d and 109k, the reproduction light is emitted in the same state as during recording, so the reproduction level generated from the interference fringes 110d and 110k is the maximum. Become. After that, the interference level decreases again, and the playback level gradually decreases.
  • the correspondence between the change in the recording condition of the plurality of interference fringes 110 and the reference mark may be input to the control means in advance, or may be recorded on the recording medium 110 as control information and used for the control. You may reproduce
  • a nonvolatile memory such as EPROM may be installed in the cartridge that accommodates the recording medium, and the correspondence between the change in the recording conditions of the plurality of interference fringes 110 and the reference mark may be recorded in the memory.
  • the cartridge is preferably capable of shielding light having a wavelength that the hologram recording layer is sensitive to prevent the recording medium from being exposed to photosensitive light.
  • the irradiation condition of the recording / reproducing apparatus can be detected, and if the irradiation condition of the recording / reproducing apparatus is adjusted based on the detection result, Since these irradiation conditions are unified, recording can be performed under the same conditions regardless of which apparatus is used, and even interference fringes recorded with different apparatuses can be reproduced.
  • the irradiation condition of the recording / reproducing apparatus may be automatically adjusted to a specific condition based on the detected irradiation condition of the recording / reproducing apparatus.
  • all recording media may be provided with reference marks for condition determination and a plurality of interference fringes.
  • the recording medium serves as a reference for condition adjustment for apparatus and maintenance. May be used as
  • a plastic substrate such as polycarbonate, a glass substrate, a metal substrate, or the like can be used.
  • a plastic substrate When a plastic substrate is used, pits can be easily formed as a control information layer by forming irregularities on the surface by pressing. Further, the glass substrate can reduce the influence of inclination due to the sag of the substrate having high strength and smoothness.
  • the metal substrate can also serve as a reflection layer for the control light.
  • the shape of the substrate 102 may be a disk shape or a card shape.
  • the thickness of the substrate 102 is not particularly limited, but if the recording medium 101 as a whole has a thickness of 1.2 to 2.4 mm, the currently used CD (Compact Disc) and DVD (Digital Versatile Disc) can be made compatible.
  • CD Compact Disc
  • DVD Digital Versatile Disc
  • the wavelength selective reflection layer 105 reflects the recording / reproducing light and transmits the control light.
  • a dichroic mirror layer or a cholesteric liquid crystal layer in which a high refractive index substance and a low refractive index substance are alternately laminated can be used as the wavelength selective reflection layer 105.
  • the reflective surface for light 2 of the first wavelength in 105 can record and reproduce information stably. Thus, it is preferable to be flat.
  • the first gap layer 104 and the second gap layer 106 are formed by applying a resin material, for example, a material such as a UV resin, by spin coating or pasting a resin sheet such as a polycarbonate sheet. It is formed.
  • the gap layer protects the hologram recording layer 107 and the control information layer 103, and adjusts the size of the hologram generated in the hologram recording layer 107, the interval between the focal lengths of the recording / reproducing light and the control light, and the like. This is also effective.
  • the second gap layer 106 can prevent a portion in the vicinity of the focal point where the interference fringes are concentrated in the hologram recording layer 107, so that the photosensitive layer of the hologram recording layer 107 is exposed by the portion near the focal point where the interference fringes are concentrated. It is possible to alleviate the phenomenon that a large amount of material is consumed and the multiplicity (amount of holograms that can be recorded at the same location) decreases.
  • the thickness of the second gap layer 106 is preferably in the range of 10 to 100 / ⁇ ⁇ .
  • the protective layer 108 is formed on the surface on the incident surface side of the recording medium 101 and protects the recording medium 101.
  • the protective layer 108 is formed by applying a resin material, such as a UV resin, to the hologram recording layer 107 by spin coating or pasting a resin sheet such as a polycarbonate sheet.
  • the recording medium 101 in FIG. 1 has a structure in which the wavelengths of the control light and the recording / reproducing light are different, and the control light is transmitted and the recording / reproducing light is reflected by the wavelength selective reflection layer 105.
  • the wavelength selective reflection layer 105 it is not limited to this configuration.
  • the recording medium of the present invention may be recorded by changing the recording conditions in the optical information recording apparatus as will be described later. However, a plurality of interference fringes are recorded on the hologram recording layer, and later. Manufacture by combining control information layers with fiducial marks arranged with different positional relationships.
  • FIG. 15 is a diagram for explaining a method for manufacturing a recording medium.
  • a plurality of interference fringes 110 are recorded on the recording medium 101a having at least the hologram recording layer 107.
  • the recording medium 101a includes a protective layer 108, a gap layer 106, and a wavelength selective reflection layer 105 that are not limited to the hologram recording layer 107 alone.
  • the interference fringes may be recorded by transferring from the master hologram substrate.
  • Master hologram substrate means information light and recording reference. Interference fringes due to interference between the virtual information light combined with the illumination and the reference light for virtual recording are recorded.
  • the master hologram substrate is reproduced with the virtual recording reference light, the virtual information light that combines the information light and the recording reference light is reproduced, so that the reproduced virtual information light is irradiated to the hologram recording layer of another recording medium.
  • interference fringes due to interference between the information light in the virtual information light and the recording reference light can be recorded. That is, if a master hologram substrate is used, a replica can be easily produced.
  • the master hologram substrate force also reproduces a plurality of virtual information beams at a time, a plurality of interference fringes can be formed at a time, so that productivity can be improved.
  • a plurality of interference fringes 110 are arranged on a straight line or arc at regular intervals in the same manner as the arrangement of a plurality of interference fringes that are normally recorded.
  • a plurality of interference fringes 110 may be mechanically recorded on the hologram recording layer 107 at regular intervals.
  • the temporary control information layer 203 is coupled to the hologram recording layer 107, alignment is performed using the control information of the temporary control information layer 203.
  • a plurality of interference fringes 110 can be recorded.
  • the temporary control information layer 203 is formed on, for example, another substrate 202, and the recording medium 101a may be bonded by a fixture or temporarily adhered, or in the process of FIG. In the optical information recording apparatus to be used, the recording medium 101a may be formed on a holder, and the holder may hold the recording medium 101a for coupling.
  • a temporary control information layer 203 and a second gap layer 204 are formed on another wide substrate 202.
  • the temporary control information layer 203 it is preferable that a plurality of reference marks 209 having the same arrangement as the plurality of interference fringes 110 to be recorded are arranged. In this case, for example, only by recording the plurality of interference fringes 110 following the reference mark 209 of the temporary control information layer 203, for example, FIG. 4, FIG. 5, FIG. 11 (A), (B) or FIG. As described above, a plurality of interference fringes having a complicated arrangement can be recorded in a predetermined arrangement compared to the arrangement of interference fringes normally recorded. After recording a plurality of interference fringes, the temporary control information layer 203 may be removed.
  • the first reference mark 209 is recorded as a temporary control information layer, and after recording the plurality of interference fringes 110, the first reference mark 209 is erased, You can record the second fiducial mark 109 as the control information layer.
  • a control information layer having a plurality of reference marks 109 arranged in a predetermined arrangement with respect to the hologram recording layer 107 on which a plurality of interference fringes 110 are recorded. 10 3 is associated with each of the plurality of reference marks 109 and the plurality of interference fringes 110 in association with each other.
  • control information layer 103 not only the control information layer 103 alone but also the substrate 102 and the gap layer 104 are simultaneously bonded to complete the recording medium 101.
  • a reference mark having a predetermined arrangement may be formed in advance on the substrate 102 to form the control information layer 103, and a laminate of the gap layer 104 may be bonded to the hologram recording layer 107 side and bonded together.
  • a plurality of reference marks are formed in the area corresponding to the predetermined area. Can be placed and combined so that the two regions overlap. For this purpose, since precise alignment is required, it is preferable to place alignment marks on the hologram recording layer side 101a and the control information layer side.
  • FIG. 7 is a schematic configuration diagram of the optical information recording / reproducing apparatus 120.
  • the optical information recording / reproducing apparatus 120 in FIG. 7 includes a recording / reproducing light source 135, a beam expander 134, a first displacement means 141, a polarization beam splitter 132, a spatial light modulator 133, a fourth displacement means 144, a beam splitter.
  • first relay lens 129, third displacement means 143, dichroic mirror 128, object lens 126, projection lens 136, photodetector 137, control element 124, and second displacement means 142 is doing. Then, the disk-shaped recording medium 101 is rotated by the driving means 127.
  • the optical information recording / reproducing apparatus 120 in Fig. 7 has a first to fourth displacing means 141-144 as a major difference from the conventional recording / reproducing apparatus.
  • the first displacing means 141 changes the irradiation position of the recording / reproducing light 114 on the recording medium 101, so that the irradiation position of the control light 115 and the irradiation position of the recording / reproducing light 114 are relative to each other. The positional relationship is changed.
  • the recording / reproducing light source 135 itself may be moved, but the direction of the optical axis of the recording / reproducing light 114 is changed. It may be allowed.
  • an element for changing the path of light such as a mirror may be provided in the optical path of the recording / reproducing light 114, and the active element may be moved or already disposed.
  • a mirror such as the polarizing beam splitter 132 may be rotated.
  • the spatial light modulator may be tilted.
  • the direction of the optical axis of the recording / reproducing light 114 is changed, it is preferable to be able to change the direction in two orthogonal directions because it can cope with all the positional deviations in the plane direction of the recording medium.
  • a plurality of displacement means may be used in combination.
  • the second displacing means 142 changes the irradiation position of the control light 115 on the recording medium 101, whereby the relative position between the irradiation position of the control light 115 and the irradiation position of the recording / reproducing light 114 is changed. It changes the relationship.
  • the control element 124 itself may be moved, but the direction of the optical axis of the control light 115 may be changed.
  • an element for changing the path of light such as a mirror or a prism may be provided in the optical path of the control light 115, and the active element may be moved. Mouth mirror Mirror such as 128 may be rotated.
  • both the first displacing means 141 and the second displacing means 142 are provided. However, any one of the positional deviations in the plane direction of the recording medium is used.
  • the timing of irradiating the control light 115 or the recording / reproduction light 114 or the position information in the reproduced control information is controlled.
  • the relative positional relationship between the control light 115 and the recording / reproducing light 114 may be controlled.
  • the irradiation timing is controlled by PLL (Phase Lock Loop) control, but the recording / playback light 114 is emitted from the recording / playback light source 135.
  • the irradiation position in the advancing direction is adjusted by adjusting the timing at which the control light 124 is emitted from the control element 124 Can do.
  • the tracking servo control or the focus servo control may be biased by adding an offset to the position information detected by the control information force reproduced by the control light 115.
  • the control light 115 is positioned so as to irradiate the center of the reference mark. Noise can be added to the tracking servo control, and the center force of the reference mark can be intentionally aligned to a position shifted.
  • the irradiation position of the reproducing light 114 can be moved.
  • the relative positional relationship between 115 and the recording / reproducing light 114 can be changed.
  • the third displacement means 143 changes the magnification of the recording / reproducing light 114 in the hologram recording layer 107 of the recording medium 101.
  • the third displacement means 143 for example, in order to change the focal length of the relay lens optical system of the recording / reproducing light 114, the focal length of at least one of the pair of relay lenses may be changed.
  • the magnification of the image of the spatial modulation pattern displayed on the spatial light modulator on the pupil plane of the objective lens 126 can be changed.
  • the magnification of the Fourier transform image in the hologram recording layer of the recording / reproducing light 14 irradiated by can also be changed.
  • the second relay lens uses a lens with variable focus.
  • the magnification of the display itself of the image of the spatial modulation pattern displayed on the spatial light modulator may be changed to change the magnification in terms of information processing. Further, as the third displacement means 143, a plurality of displacement means may be used in combination.
  • the fourth displacing means 144 changes the arrangement of the spatial modulation pattern of the recording / reproducing light, thereby changing the rotation angle about the optical axis of the recording / reproducing light and the spatial modulation pattern of the recording / reproducing light.
  • the position is changed (Fig. 3 (D) and (E)).
  • the means for spatially modulating the light in the means for generating the recording / reproducing light is rotated about the optical axis or translated in the direction perpendicular to the optical axis. .
  • a transmissive or reflective spatial light modulator that has a large number of pixels arranged in a grid and can modulate the phase or Z and intensity of the emitted light for each pixel.
  • DMD digital 'micromirror device
  • a matrix type liquid crystal element can be used.
  • the spatial modulation pattern of the reference light is a constant pattern
  • a mask in which an opening of the spatial modulation pattern is formed can be used.
  • the rotation angle about the optical axis of the recording / reproducing light can be changed even if the arrangement of the recording medium is rotated.
  • the display itself of the image of the spatial modulation pattern displayed on the spatial light modulator may be translated or rotated.
  • a plurality of displacement means may be used in combination as the fourth displacement means 144.
  • the moving distance and the rotation amount depend on the pixel pitch of the spatial light modulator. If the pixel pitch of the spatial light modulator is greater than the required alignment accuracy, other displacement means may be used in addition to simply moving or rotating the display of the spatial light modulator.
  • the interference fringes are sequentially recorded by changing the incident angle of the recording light, the error of the incident angle of the recording light in each apparatus can be detected.
  • the objective lens may be moved parallel to the optical axis.
  • the optical information recording / reproducing apparatus 120 in FIG. 1 includes all of the first to fourth displacement means 141 to 144, but only one of them may be provided. As another displacement means, a means capable of changing the wavelength of the recording / reproducing light may be provided.
  • the drive means itself in the first to fourth displacement means 141 to 144 may be installed only when the conditions are set, removed during normal use, and the arrangement of the optical system is fixed. Yo ...
  • the recording / reproducing light source 135 emits light that serves as the recording / reproducing light 14.
  • a coherent beam of linearly polarized light is generated using a semiconductor laser.
  • the recording / reproducing light source 1335 a shorter wavelength is advantageous in order to perform high-density recording, and it is preferable to employ a blue laser or a green laser.
  • the first displacement means 141 may be movable.
  • the beam expander 134 is shaped so that the beam diameter of the light emitted from the recording / reproducing light source 135 can be used as recording / reproducing light.
  • a collimator lens may be used for diverging light.
  • the polarization beam splitter 132 reflects or transmits linearly polarized light (for example, P-polarized light), and It has a semi-reflective surface that transmits or reflects linearly polarized light (eg, S-polarized light) perpendicular to the polarized light.
  • the polarizing beam splitter 132 reflects the light beam generated from the recording / reproducing light source 135 toward the spatial light modulator 133, and the polarization direction is rotated by 90 degrees by the spatial light modulator 133. Transmits information light, recording reference light, or reproduction reference light.
  • the polarization beam splitter 132 may be rotatable as the first displacement means 141.
  • Spatial light modulator 133 has a large number of pixels arranged in a lattice pattern, and is a transmissive or reflective spatial light modulator capable of modulating the phase or Z and intensity of emitted light for each pixel. Can be used.
  • the spatial light modulator DMD (digital 'micromirror' device) or matrix type liquid crystal element can be used. DMD can modulate the intensity of incident light by changing the reflection direction for each pixel or spatially modulate the intensity of incident light by changing the reflection position for each pixel.
  • the liquid crystal element can spatially modulate the polarization state, intensity, or phase of incident light by controlling the alignment state of the liquid crystal for each pixel.
  • the phase of the light can be spatially modulated by setting the phase of the emitted light to one of two values that differ from each other by ⁇ radians. Further, in FIG. 7, the spatial light modulator rotates the polarization direction of the outgoing light by 90 ° with respect to the polarization direction of the incident light.
  • information light carrying the spatial modulation pattern as information is generated by spatially modulating the light from the light source 135 with the spatial modulation pattern displayed on the display surface of the spatial light modulator 133. be able to.
  • the spatial light modulator 133 also functions as means for generating the reference light for recording at the time of recording and the reference light for reproduction at the time of reproduction.
  • the spatial light modulator 133 when information light and reference light are formed by one spatial light modulator, two regions are provided in the spatial light modulator, information light is formed in one region, and the other region is formed. In this case, reference light may be formed. Therefore, in FIG. 7, the light source 135 and the spatial light modulator 133 are recording light generation means and reproduction light generation means.
  • the means for generating the reference light may be provided separately from the spatial light modulator 133.
  • the light from the light source 135 may be divided, one light may be generated by the spatial light modulator 133, and the other light may be used as the reference light.
  • the optical that splits the light from the light source 133 The optical system that propagates the other light including the element serves as reference light generation means, and the reproduction apparatus serves as reproduction light generation means.
  • the reference light may be spatially modulated by providing another spatial light modulator in the optical system that propagates the other light.
  • the spatial modulation pattern of the reference light needs to be imaged on the entrance pupil plane of the objective lens 126, so the spatial light modulator that generates the information light and the spatial light that generates the reference light.
  • the modulator has a conjugate relationship.
  • the beam splitter 131 transmits reproduction reference light, and reflects reproduction light generated from the recording medium 101 by the reproduction reference light toward the detection means 137.
  • the first relay lens 129 in FIG. 7 is arranged between the spatial light modulator 133 and the objective lens 126 together with the third displacement means 143, and is displayed on the spatial light modulator 133.
  • An image is arranged on the entrance pupil plane of the objective lens 126.
  • the first relay lens 129 and the third displacement means 14 are disposed between the objective lens 126 and the detection means 137, and are separated from the hologram recording layer of the recording medium 101 by the reproduction light.
  • the generated reproduction light is arranged so that the image on the exit pupil plane of the objective lens 126 is formed again by the detection means 137 as a real image.
  • an image is formed by the detection means 137 via the projection lens 136 arranged in front of the detection means 136.
  • the dichroic mirror 128 has a wavelength selective reflection surface that transmits the recording / reproducing light 114 emitted from the recording / reproducing light source 135 and reflects the servo light 115.
  • the dichroic mirror 128 may be rotatable as the second displacement means 142.
  • the objective lens 126 irradiates the recording medium 101 with information light and a recording reference light imaged on the entrance pupil plane, and causes the hologram recording layer to interfere and record.
  • the recording medium 101 is irradiated with reproduction reference light imaged on the entrance pupil plane, and the reproduction light generated from the recording medium 101 is imaged on the exit pupil plane.
  • the projection lens 136 projects the reproduction light generated from the recording medium 101 onto the photodetector 137 during reproduction. With the projection lens 136, the spatial modulation pattern displayed on the spatial light modulator 133 can be enlarged and reproduced, and information can be reproduced more accurately.
  • the photodetector 137 has a large number of pixels arranged in a lattice pattern, and light received for each pixel. It is possible to detect the intensity of.
  • a CCD solid-state image sensor or a MOS solid-state image sensor can be used.
  • a smart optical sensor in which a MOS type solid-state imaging device and a signal processing circuit are integrated on one chip (for example, “0 plus E, September 1996, No. 202, No. 93- See page 99.;) may be used.
  • This smart optical sensor has a high transfer rate and a high-speed calculation function. By using this smart optical sensor, high-speed playback is possible, for example, transfer in the order of G (giga) bits Z seconds. It becomes possible to perform playback at a rate.
  • the control element 124 reproduces the control information recorded on the recording medium 101, and includes a light source that generates control light, for example, a semiconductor laser, and light that receives light returned from the recording medium 101. And a detector.
  • the control light 115 emitted from the control element 124 preferably has a wavelength different from that of the recording / reproducing light 114 that preferably does not affect the hologram recording layer of the recording medium 101.
  • the optical information recording / reproducing apparatus 120 has control means (not shown).
  • the control means controls the operation of the optical information recording / reproducing apparatus 120 including the first to fourth displacement means 141 to 144.
  • the method for recording the interference fringes for determining the condition on the recording medium 101 is to record the plurality of interference fringes on the hologram recording layer by changing the recording conditions in association with the reference mark of the recording medium 101. .
  • control light 115 is emitted from the control element 124, and the emitted control light 115 is reflected by the second displacement means 142, reflected by the dichroic mirror 128, and by the objective lens 126.
  • the recording medium 101 is irradiated and reflected by the recording medium 101.
  • the reflected return light of the control light is detected by the control element 124 along the reverse path.
  • the reference mark of the recording medium 101 is detected by the control light 115.
  • the recording / reproducing light 114 is emitted from the recording / reproducing light source 135 in association with the reference mark.
  • the recording / reproducing light 114 has its beam diameter enlarged by the beam splitter 134, reflected by the first displacement means 141, and reflected by the polarization beam splitter 132 toward the spatial light modulator 133.
  • Spatial light modulator 133 displays the spatial modulation pattern of information light and recording reference light. Thus, information light and recording reference light are generated as the recording / reproducing light 114.
  • the recording / reproducing light 114 is converted into P-polarized light by the spatial light modulator 133, passes through the polarization beam splitter 132 and the beam splitter 131, and is objectively received by the first relay lens 129 and the third displacement means 143.
  • the image of the two-dimensional pattern displayed on the spatial light modulator 133 is transferred to the pupil plane of the lens 126.
  • the recording / reproducing light 114 passes through the dichroic mirror 128 and is irradiated onto the recording medium 101 by the objective lens 126.
  • the recording / reproducing light 114 interferes with the hologram recording layer of the recording medium 101 to form interference fringes.
  • the recording can be performed by sequentially changing the angle of the first displacement means 141 in one direction for each reference mark. Since the irradiation position of the reproduction light 114 changes in one direction, the positional relationship between the interference fringes 110a to n and the reference marks 109a to n in the plane direction of the recording medium is changed as shown in the upper or lower part of FIG. Recorded.
  • the second displacing means 1 42 As shown in the upper or lower part of Fig. 4, when the positional relationship between the interference fringes 110a to 110n and the reference marks 109a to 109n in the plane direction of the recording medium is changed, the second displacing means 1 42 The angle may be sequentially changed for each reference mark.
  • some recording conditions can be controlled by changing irradiation conditions and display conditions by the control means without using physical displacement means. Note that changing the irradiation conditions and display conditions to control the recording conditions by the control means may adversely affect the actual recording or reproduction operation. You can use a combination of various displacement means and multiple controls.
  • the positional relationship between each reference mark and the interference fringes in the traveling direction as shown in the upper part of FIG. can be changed.
  • the relative positional relationship between each reference mark and the interference fringes can be changed by gradually changing the offset to which the control information force is added to the detected position information.
  • the plurality of reference marks 109 are not aligned at regular intervals, and are positioned relative to the plurality of interference fringe arrays 117b that are normally recorded. Change relationship If a plurality of interference fringes are recorded without completely following the displacement of the arrangement of the plurality of reference marks by the control light 114, the positional relationship between each reference mark and the interference fringes is changed. Can be made.
  • PLL Phase Lock Loop
  • LPF Low Pass Fi Iterer
  • the magnification of the recording / reproducing light 114 in the hologram recording layer 107 of the recording medium 101 is changed, the magnification of the recording / reproducing light 114 is changed for each reference mark by the third displacing means 143. May be changed sequentially.
  • the fourth displacing means 144 centers the optical axis of the recording / reproducing light If the rotation angle and the position of the spatial modulation pattern in the recording / reproducing light are sequentially changed for each reference mark, the bright spot 116 in the interference fringe 110d rotates (Fig. 3 (D)), or the interference fringe 110d The position of the bright spot 116 changes (Fig. 3 (E)).
  • the optical information recording / reproducing apparatus 120 can adjust the recording / reproducing conditions using the recording medium 101 on which the interference fringes for condition determination are recorded.
  • the reference mark of the recording medium 101 is detected by the control light 115 emitted from the control element 124.
  • the recording / reproducing light 114 is emitted from the recording / reproducing light source 135.
  • the recording / reproducing light 114 is enlarged in beam diameter by the beam expander 134, reflected by the first displacement means 141, and reflected by the polarization beam splitter 132 toward the spatial light modulator 133.
  • the spatial light modulator 133 displays the spatial modulation pattern of the reproduction reference light, and generates reproduction reference light as the recording / reproduction light 114.
  • the recording / reproducing light 114 is converted into P-polarized light by the spatial light modulator 133, passes through the polarization beam splitter 132 and the beam splitter 131, and is reflected by the first relay lens 129 and the third displacing means 143 of the objective lens 126. 2D pattern displayed on spatial light modulator 133 on the pupil plane The image is transferred.
  • the recording / reproducing light 114 passes through the dichroic mirror 128 and is irradiated onto the recording medium 101 by the objective lens 126.
  • the recording / reproducing light 114 interferes with the interference fringes recorded in the hologram recording layer of the recording medium 101 to generate reproducing light.
  • the reproduced light that also generated the hologram recording layer force passes through the objective lens 126 and the dichroic mirror 138, and is spatially modulated on the pupil plane of the objective lens 126 by the first relay lens 129 and the third displacement means 143. While the pattern image is transferred to the pupil plane of the projection lens, it is reflected by the beam splitter 131. Thereafter, the reproduction light is projected onto the photodetector 136 by the projection lens 136, and an image of the spatial modulation pattern of the reproduction light is detected.
  • the first displacement means 141 or the second displacement means what is necessary is just to change the angle of 142.
  • the timing of irradiating the control light 115 or the recording / reproduction light 114 or the position information in the reproduced control information is controlled. May be.
  • the timing for emitting the recording / reproduction light 114 from the recording / reproduction light source 135 and the control light 115 from the control element 124 are emitted.
  • the control information reproduced by the control light 115 may include an offset in the detected position information and bias the tracking servo or focus servo by the control light 115.
  • the magnification of the recording / reproducing light 114 in the hologram recording layer of the recording medium 101 is adjusted.
  • the magnification of the recording / reproducing light 114 may be changed by the third displacement means 143.
  • the optical axis of the recording / reproducing light is adjusted by the fourth displacing means 144. It is only necessary to change the rotation angle as the center and the position of the spatial modulation pattern in the recording / reproducing light.
  • the information used as the reference for adjustment (in the above example, the curve 7 which is the detection result of the optical information recording / reproducing apparatus in which a plurality of interference fringes are recorded) is recorded as the control information of the recording medium 101.
  • V may be recorded as information on multiple interference fringes for condition determination.
  • the interference fringes are recorded with the recording / reproducing light after adjusting the recording / reproducing conditions.
  • the interference fringes are recorded under the standard recording / reproducing conditions.
  • Interference fringes with the same recording / reproducing conditions are recorded on the medium. It can be played back on multiple devices. If playback is performed after adjusting the recording and playback conditions, playback can be performed at a higher playback level. Changes caused by long-term use of the device can be corrected.
  • the adjustment may be performed every time, it may be performed only at an appropriate adjustment or maintenance time. Moreover, although it is preferable to carry out automatically by a control apparatus, manual adjustment is also possible.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Holo Graphy (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

L’invention vise à améliorer la polyvalence parmi des dispositifs d’enregistrement/reproduction d’informations optiques. Un support d’enregistrement possède une couche de recodification d’hologramme (107), où des franges d’interférence sont enregistrées, une couche d’informations de commande (103), où des informations de commande à reproduire par un faisceau de commande sont enregistrées, et une pluralité de marques de référence (109) qui peuvent être détectées par le faisceau de commande. Une pluralité de franges d’interférence (110) sont enregistrées dans la couche d’enregistrement d’hologramme dans des conditions d’enregistrement variées en liant les franges d’interférence aux marques de référence.
PCT/JP2006/309908 2005-05-18 2006-05-18 Support d’enregistrement, procede d’enregistrement d’informations optiques, dispositif d’enregistrement d’informations optiques, procede de reproduction d’informations optiques, dispositif de reproduction d’informations optiques et procede de fabrication de support d’enregistr Ceased WO2006123732A1 (fr)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007138867A1 (fr) * 2006-05-26 2007-12-06 Optware Corporation Procédé d'enregistrement d'informations optiques et support d'enregistrement
JP2008276838A (ja) * 2007-04-26 2008-11-13 Fuji Xerox Co Ltd 光信号記録媒体及び光情報記録再生装置
JP2010518420A (ja) * 2007-02-06 2010-05-27 バイエル・イノヴェイション・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング ホログラフィック記憶媒体に記憶されたホログラムを読み取るためのホログラフィック記憶装置、およびこれを実現する方法
JP2023001090A (ja) * 2021-06-17 2023-01-04 アメシスタム ストレージ テクノロジー カンパニー リミテッド ホログラフィック記憶光路システム及びそのビーム校正方法

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JP2004158113A (ja) * 2002-11-06 2004-06-03 Memory Tec Kk 光情報記録媒体

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Publication number Priority date Publication date Assignee Title
JP2004158113A (ja) * 2002-11-06 2004-06-03 Memory Tec Kk 光情報記録媒体

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007138867A1 (fr) * 2006-05-26 2007-12-06 Optware Corporation Procédé d'enregistrement d'informations optiques et support d'enregistrement
JP2007316422A (ja) * 2006-05-26 2007-12-06 Optware:Kk 光情報記録方法及び記録媒体
JP2010518420A (ja) * 2007-02-06 2010-05-27 バイエル・イノヴェイション・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング ホログラフィック記憶媒体に記憶されたホログラムを読み取るためのホログラフィック記憶装置、およびこれを実現する方法
JP2008276838A (ja) * 2007-04-26 2008-11-13 Fuji Xerox Co Ltd 光信号記録媒体及び光情報記録再生装置
JP2023001090A (ja) * 2021-06-17 2023-01-04 アメシスタム ストレージ テクノロジー カンパニー リミテッド ホログラフィック記憶光路システム及びそのビーム校正方法
EP4116971A3 (fr) * 2021-06-17 2023-04-26 Amethystum Storage Technology Co., Ltd. Système optique de stockage holographique et son procédé d'étalonnage de faisceau

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