WO2012032600A1 - Optical information record-playback device and optical information record-playback method - Google Patents

Optical information record-playback device and optical information record-playback method Download PDF

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Publication number
WO2012032600A1
WO2012032600A1 PCT/JP2010/065274 JP2010065274W WO2012032600A1 WO 2012032600 A1 WO2012032600 A1 WO 2012032600A1 JP 2010065274 W JP2010065274 W JP 2010065274W WO 2012032600 A1 WO2012032600 A1 WO 2012032600A1
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WO
WIPO (PCT)
Prior art keywords
recording medium
light
optical information
reference light
period
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PCT/JP2010/065274
Other languages
French (fr)
Japanese (ja)
Inventor
岡野　英明
渡部　一雄
小川　昭人
隆 碓井
Original Assignee
株式会社 東芝
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Priority to PCT/JP2010/065274 priority Critical patent/WO2012032600A1/en
Publication of WO2012032600A1 publication Critical patent/WO2012032600A1/en

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08547—Arrangements for positioning the light beam only without moving the head, e.g. using static electro-optical elements
    • G11B7/08564—Arrangements for positioning the light beam only without moving the head, e.g. using static electro-optical elements using galvanomirrors
    • 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
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2222/00—Light sources or light beam properties
    • G03H2222/50—Geometrical property of the irradiating beam
    • G03H2222/56—Conjugated beam

Definitions

  • Embodiments described herein relate generally to an optical information recording / reproducing apparatus and an optical information recording / reproducing method for recording and reproducing information as a hologram.
  • Optical information recording media represented by CDs (Compact Discs), DVDs (Digital Versatile Discs), BDs (Blu-ray Discs), etc. have hitherto been used mainly for shortening the wavelength of laser light and the numerical aperture (NA) of objective lenses.
  • the increase corresponds to the increase in recording density.
  • all of them are said to be approaching the limits due to technical reasons and the like, and an increase in the recording transfer rate by other means or methods is desired.
  • volume recording type high-density recording hereinafter referred to as “HDS: Holographic Digital Storage” using a hologram and an HDS recording / reproducing apparatus are being developed.
  • the hologram optical disk is a volume recording method capable of recording in the thickness direction of the information recording layer. Large recording density can be obtained.
  • One method for increasing the recording density of HDS is an angle multiplex recording method.
  • This angle multiplex recording method is a method that has not been seen in conventional CDs or DVDs, and is an important recording method in the two-beam interference method.
  • the two-beam interference method is a two-dimensional bar generated at an interference position between information light that holds information to be recorded and reference light that has the same wavelength as the information light and is generally generated from the same light source.
  • page data information expressed by code-like interference fringes (hereinafter referred to as page data) is recorded on an information recording layer of an optical information recording medium.
  • page data information expressed by code-like interference fringes
  • the optical information recording / reproducing apparatus can be miniaturized by using a technique called phase conjugate reproduction.
  • the laser light when reproducing the data recorded by the two-beam interference method, the laser light must be incident on the optical information recording medium at the same angle as that at the time of recording.
  • the angle accuracy with respect to the information recording medium is required to be very high.
  • the angle accuracy is desirably 0.025 degrees or less.
  • the present disclosure has been made to solve the above-described problem, and an object thereof is to provide an optical information recording / reproducing apparatus and an optical information recording / reproducing method capable of increasing a data transfer rate during phase conjugate reproduction. To do.
  • the optical information recording / reproducing apparatus includes a first control unit, a reflective element, a second control unit, and an imaging unit.
  • the first control unit records the information as a hologram when information light including information to be recorded emitted from a coherent light source interferes with reference light having the same wavelength as the information light.
  • the recording medium is controlled to rotate in a certain direction for the first period.
  • the reflective element reflects the reference light transmitted through the recording medium.
  • the second control unit controls the reflection element by rotating the reflection element so that an incident angle of the reflected reference light reflected by the reflection element to the recording medium is constant for a second period.
  • An imaging part images the reproduction
  • FIG. 1 is a block diagram showing an optical information recording / reproducing apparatus according to a first embodiment.
  • FIG. 5 is a diagram illustrating an example of the operation of the phase conjugate reproducing mirror according to the first embodiment.
  • FIG. 6 is a diagram illustrating an example of a phase conjugate reproducing mirror according to a modification of the first embodiment.
  • an optical information recording / reproducing apparatus and an optical information recording / reproducing method according to the present embodiment will be described in detail with reference to the drawings. Note that, in the following embodiments, the same reference numerals are assigned to the same operations, and duplicate descriptions are omitted as appropriate.
  • a two-beam optical system is used, in which the information light and the reference light are incident so as to interfere with each other in the information recording layer in the optical information recording medium via separate objective lenses. To do.
  • An optical information recording / reproducing apparatus 100 includes a laser light source 101, shutters 102 and 104, polarization beam splitters 103 and 106, relay lenses 105, 108, and 114, a spatial light modulator 107, an aperture 109, and an objective lens. 110, half-wave plates 111 and 116, reflection mirrors 112 and 113, a system controller 115, and an actuator 116. Information is recorded on the optical information recording medium 150 using the optical information recording / reproducing apparatus 100.
  • the system controller 115 and the actuator 116 are also collectively referred to as a first control unit.
  • the optical information recording medium 150 a photopolymer is sandwiched by a glass substrate or the like with a thickness of 0.2 mm to 2.0 mm. Thereby, an information recording layer is formed on the optical information recording medium 150.
  • the refractive index of that portion changes.
  • the light intensity distribution is written as a change in the refractive index due to the interference fringes. That is, information is recorded on the optical information recording medium 150 as this refractive index change.
  • the laser light source 101 is a light source that emits laser light for recording and reproduction, and generally uses a combination of a green or blue-violet semiconductor laser and an external resonator (not shown) for stabilizing the wavelength.
  • the laser light source 101 may be a light source that emits laser light such as other wavelengths or a so-called DFB laser, SHG laser, solid-state laser, and gas laser.
  • the shutters 102 and 104 open or close to allow light to pass or block light.
  • Polarization beam splitters (hereinafter also referred to as PBSs) 103 and 106 split the laser light into two light beams.
  • PBSs Polarization beam splitters
  • the relay lenses 105, 108, and 114 are a combination of two or more lenses, and the beam diameter is enlarged to be parallel light.
  • the spatial light modulator 107 is, for example, a ferroelectric reflective liquid crystal display device (FLCOS), a transmissive liquid crystal display device, a DMD (digital micromirror device), and the like, and spatially modulates laser light to generate a page. Information light carrying data is generated.
  • the aperture 109 is installed at a place where the light incident on the relay lens 108 is once condensed before passing through the relay lens 108.
  • the objective lens 110 is used to collect information light on the optical information recording medium 150.
  • the half-wave plates 111 and 116 convert the polarization of light. Specifically, mutual conversion is performed from S-polarized light to P-polarized light and from P-polarized light to S-polarized light.
  • the reflection mirrors 112 and 113 reflect light.
  • the system controller 115 generates a control signal that controls the operation of the actuator 116.
  • the actuator 116 receives a control signal from the system controller 115 and controls driving of the optical information recording medium 150 according to the control signal. Specific operation of the actuator 116 will be described later.
  • Parallel light generated from the laser light source 101 passes through the shutter 102 and enters the polarization beam splitter 103.
  • the incident parallel light is split into S-polarized light and P-polarized light by the polarization beam splitter 103.
  • S-polarized light is reflected by the polarization beam splitter 103 and used as information light, and P-polarized light is transmitted and used as reference light.
  • the reflected S-polarized light passes through the shutter 104 and enters the relay lens 105.
  • the beam diameter of the information light is expanded so that the S-polarized light is incident on the spatial light modulator 107 with a certain degree of uniform intensity.
  • the information light whose beam diameter has been enlarged is reflected by the PBS 106 and enters the spatial light modulator 107, and is polarization-modulated by the spatial light modulator 107 with page data.
  • the OFF bit is output as S-polarized light, and the ON bit is modulated into P-polarized light.
  • the information light modulated by the spatial light modulator 107 passes through the PBS 106, the information light is amplitude-modulated by transmitting the ON bit and reflecting the OFF bit.
  • the beam diameter of the amplitude-modulated information light is adjusted by the relay lens 108 in accordance with the incident diameter of the objective lens 110.
  • an aperture 109 is once installed at a place where information light is once condensed.
  • the place where the information light is collected is the Fourier transform plane of the intensity distribution in which the information light is modulated by the spatial light modulator 107 and the PBS 106.
  • the Fourier transform image of the information light has a conjugate relationship with the information light at the condensing position in the vicinity of the optical information recording medium 150.
  • the Fourier transform image of the information light near the position incident on the optical information recording medium 150 is obtained. The size of the information light is determined.
  • the information light in the vicinity of the optical information recording medium 150 can be taken into consideration if recording is performed at a step interval that is also parallel to the medium plane of the optical information recording medium 150.
  • the information light that has passed through the relay lens 108 enters the half-wave plate 116 and is converted from P-polarized light to S-polarized light.
  • the information light converted into S-polarized light is incident on the objective lens 110 and given a lens power, and is condensed on the optical information recording medium 150. Note that the condensing position of the information light is not limited to the inside of the optical information recording medium 150 but may be outside the optical information recording medium 150.
  • the reference light transmitted through the PBS 103 is converted into S-polarized light by the half-wave plate 111.
  • the reference light converted to S-polarized light is reflected by the reflection mirror 112 and the reflection mirror 113 and enters the relay lens 114.
  • the incident reference light is converted by the relay lens 114 into a beam diameter that is substantially the same as the beam diameter of the information light on the optical information recording medium 150.
  • the reference light is incident on the same position as the position of the optical information recording medium 150 on which the information light is incident.
  • the information light and the reference light interfere to generate interference fringes, and the interference fringes are written in the information recording layer of the optical information recording medium 150 as a refractive index change.
  • interference fringes are generated by the reference light before (converging light) or after (diverging light) the information light condensing position, It is also possible to record information as a change in refractive index in the information recording layer.
  • an xyz orthogonal coordinate system fixed to the information recording layer of the optical information recording medium 150 is considered.
  • the z-axis is perpendicular to the thickness direction of the optical information recording medium 150 (that is, the direction perpendicular to the medium surface), that is, information
  • An x-axis and a y-axis perpendicular to each other are taken in the surface direction of the recording layer.
  • the optical information recording / reproducing apparatus 100 When performing angle multiplex recording, the optical information recording / reproducing apparatus 100 according to the present embodiment performs multiple recording of ⁇ y while changing the angle by rotating the optical information recording medium 150 around the y axis (around the in-plane axis). Do.
  • ⁇ y is a unit angle for rotating the optical information recording medium 150 in angle multiplexing recording.
  • the system controller 115 operates the actuator 116 to rotate the optical information recording medium 150 about the y axis by ⁇ y steps ( ⁇ y) (hereinafter referred to as ⁇ y rotation), and refers to the information light at each ⁇ y step.
  • Information is recorded by simultaneously irradiating the optical information recording medium 150 with light.
  • ⁇ y the relative angle between the information light and the reference light and the optical information recording medium 150 changes, and different page data is recorded.
  • ⁇ y multiplex recording is performed, but the present invention is not limited to this.
  • ⁇ z multiplex recording may be performed in which information is recorded while the optical information recording medium 150 is rotated by ⁇ z steps ( ⁇ z) around the z axis (hereinafter referred to as ⁇ z rotation).
  • ⁇ z rotation ⁇ z steps
  • a recording method using both ⁇ y multiplex recording and ⁇ z multiplex recording may be employed.
  • the ⁇ y step and the ⁇ z step need not always be constant, and the step width may be changed according to the incident angle of the reference light.
  • the optical information recording / reproducing apparatus 200 includes a quarter-wave plate 201, a phase conjugate reproducing mirror 202, a phase conjugate reproducing mirror control unit 203, an actuator 204, And an imaging unit 205.
  • the phase conjugate reproduction mirror control unit 203 and the actuator 204 are collectively referred to as a second control unit.
  • the quarter wave plate 201 converts the polarization of the reference light.
  • the phase conjugate reproduction mirror 202 is, for example, a galvanometer mirror, and reflects the reference light so that the phase of the reference light is conjugate.
  • the phase conjugate reproduction mirror control unit 203 generates a control signal for operating the actuator 204.
  • the actuator 204 receives a control signal from the phase conjugate reproduction mirror control unit 203 and controls the angle of the phase conjugate reproduction mirror 202.
  • the imaging unit 205 is a light receiving element configured by, for example, a CMOS sensor, and images page data recorded on the optical information recording medium 150.
  • a medium moving mechanism that rotates the optical information recording medium 150 by ⁇ y rotation or scans in the xy plane may be included.
  • a drive control unit that controls the medium moving mechanism or a signal processing unit that processes the output of the imaging unit 205 may be included.
  • the parallel light emitted from the laser light source 101 passes through the shutter 102 and enters the PBS 103.
  • PBS 103 S-polarized light is reflected and P-polarized light is transmitted.
  • the S-polarized light is shielded by closing the shutter 104.
  • P-polarized light is used as reference light.
  • the transmitted reference light is converted to S-polarized light by the half-wave plate 111, reflected by the reflection mirror 112 and the reflection mirror 113, and enters the relay lens 114.
  • the reference light is enlarged or reduced to a desired beam diameter by the relay lens 114 and enters the optical information recording medium 150.
  • the reference light incident on the optical information recording medium 150 passes through the optical information recording medium 150, passes through the quarter-wave plate 201, and is reflected by the phase conjugate reproducing mirror 202.
  • the reflected reference light from the phase conjugate reproducing mirror 202 is again transmitted through the quarter-wave plate 201 and converted to P-polarized light.
  • the reference light converted into the P-polarized light is transmitted again through the optical information recording medium 150.
  • the incident light to the optical information recording medium 150 is adjusted to be equal to that at the time of recording, and the reproduction light is reproduced. Since the reference light is P-polarized light, the reproduction light is also P-polarized light.
  • the reproduction light passes through the objective lens 110, passes through the half-wave plate 116, is converted into S-polarized light, the beam diameter is enlarged or reduced by the relay lens 108 and the aperture 109, and is reflected by the PBS 106. Thereafter, the reproduction light is incident on the imaging unit 205 and picked up, and reproduced page data is acquired.
  • FIG. 3 is a diagram showing an angle change of the reflected reference light from the phase conjugate reproduction mirror 202 and a time series of the rotation operations of the optical information recording medium and the phase conjugate reproduction mirror 202. From FIG. 3A to FIG. 3C, when reproducing page 1 on which information is recorded with the incident angle of the reference light to the optical information recording medium 150 being ⁇ y1, FIG. 3D to FIG. Up to f) is the case where the page 2 on which information is recorded with the incident angle of the reference light to the optical information recording medium 150 being ⁇ y2 is reproduced.
  • the optical information recording medium 150 rotates in a certain direction around the y axis (clockwise in this case) while keeping the angular velocity constant.
  • the phase conjugate reproduction mirror 202 is controlled so that the reflected reference light enters the optical information recording medium 150. Rotate so that the angle is ⁇ y1.
  • the phase conjugate reproduction mirror 202 is rotated in the same direction as the optical information recording medium 150 at an angular velocity that is half the angular velocity at which the optical information recording medium 150 rotates, and the reflected reference light from the phase conjugate reproduction mirror 202 is reflected.
  • the incident angle ⁇ y1 to the optical information recording medium 150 can be kept constant.
  • the optical information recording medium 150 continues to rotate, the incident angle of the reflected reference light to the optical information recording medium 150 approaches from ⁇ y1 to ⁇ y2.
  • page jump as shown in FIG. 3C to FIG. 3D is performed.
  • the phase conjugate reproducing mirror 202 rotating so that the incident angle of the reflected reference light to the optical information recording medium 150 is constant at ⁇ y1 is reversely rotated as shown in FIG.
  • the phase conjugate reproduction mirror 202 is controlled so that the incident angle of the reflected reference light to the optical information recording medium 150 becomes ⁇ y2.
  • FIGS. 3E and 3F the phase conjugate in the same direction as the optical information recording medium 150 so as to keep the incident angle ⁇ y2 of the reflected reference light to the optical information recording medium 150 constant.
  • the reproduction mirror 202 is rotated.
  • FIG. 4 the time change of the incident angle of the reference light to the optical information recording medium 150 and the incident angle of the reflected reference light to the optical information recording medium 150 from FIG. 3A to FIG. Shown in (A) to (f) in FIG. 4 correspond to the time series from FIG. 3 (a) to FIG. 3 (f), respectively.
  • An angle 401 and an angle 402 are incident angles of the reflected reference light to the optical information recording medium 150.
  • the angle 401 indicates the incident angle ⁇ y1 and the angle 402 indicates the incident angle ⁇ y2.
  • An angle 403 indicates an incident angle of the reference light to the optical information recording medium 150. It is assumed that a page jump occurs between (c) and (d).
  • a period 404 and a period 405 indicate page data read periods for page 1 and page 2, respectively.
  • the angle 403 increases in proportion to time. Accordingly, by controlling the rotation of the phase conjugate reproduction mirror 202, the incident angle of the reflected reference light to the optical information recording medium 150 is kept constant. Specifically, as indicated by the angles 401 and 402, the incident angle of the reflected reference light to the optical information recording medium 150 is maintained at ⁇ y1 during the period from (a) to (c), and from (d) to (f ) Until ⁇ y2. Therefore, during the period in which the incident angle of the reflected reference light to the optical information recording medium 150 is constant, the reproduction light of the page is imaged by the imaging unit 205 in the periods 404 and 405, and the recorded page data is acquired respectively. Can do.
  • the readout period (period 404, period 405) is set to a period in which the total luminance of the reproduction light of the page is equal to or higher than the threshold in this embodiment, but is not limited to this, and the optical information of the reflected reference light It is sufficient that the phase conjugate reproduction mirror 202 can be controlled so that page data can be reproduced, for example, the incident angle to the recording medium 150 is within a threshold value.
  • the optical information recording medium 150 is a relatively large medium, it is difficult to quickly perform control such as stop or start of rotation. Therefore, by controlling the rotation of an element smaller than the optical information recording medium 150 such as the phase conjugate reproducing mirror 202, the rapid rotation stop and start of the optical information recording medium 150 can be easily performed.
  • a relatively large optical information recording medium is rotated with a constant angular velocity in a certain direction, and the rotation of the phase conjugate reproducing mirror having a smaller element configuration than the optical information recording medium.
  • control such as rotation stop or reverse rotation of the phase conjugate reproduction mirror is easier than controlling the optical information recording medium, angle accuracy and control speed during phase conjugate reproduction can be improved. It is possible to increase the data transfer rate at the time of reproducing information recorded by angle multiplexing.
  • the angular velocity between the optical information recording medium 150 and the polygon mirror 501 is made constant by optimizing the multiple recording angle step when recording information on the optical information recording medium 150 in a multiplexed manner and the number of faces of the polygon mirror 501. can do.
  • the angular velocity may be set to the same angular velocity as that of the optical information recording medium 150 or may be set to a constant angular velocity that is half the angular velocity of the optical information recording medium 150. By doing so, the incident angle of the reflected reference light to the optical information recording medium 150 is kept constant for a certain period without controlling the stop or reverse rotation of the optical information recording medium 150 and the phase conjugate reproducing mirror.
  • the relative angle between the information light and the reference light and the optical information recording medium 111 is changed by rotating the optical information recording medium 150.
  • the relative angle is changed.
  • the difference is that the direction of the reference light is controlled in order to change.
  • An example of controlling the direction of the reference light is shown in FIG.
  • a galvanometer mirror 601 is installed instead of the fixed reflection mirror 113.
  • the relay lens 114 is disposed so that the reflection surface of the galvano mirror 601 and the page data recording position of the information recording layer of the optical information recording medium 150 are conjugated. Then, by rotating the phase conjugate reproducing mirror 202 and the galvanometer mirror 601, the relative angle can be changed while the optical information recording medium 150 is fixed.
  • the same effect as that of the first embodiment can be obtained while the optical information recording medium is fixed by controlling the direction of the reference light by a galvanometer mirror or the like.
  • Optical information recording / reproducing apparatus 101 ... Laser light source, 102, 104 ... Shutter, 103, 106 ... Polarizing beam splitter (PBS), 105, 108, 114 ... Relay lens , 107 ... Spatial light modulator, 109 ... Aperture, 110 ... Objective lens, 111, 116 ... Half-wave plate, 112, 113 ... Reflection mirror, 150 ... Optical information recording medium 115 ... System controller 116, 204 ... Actuator 201 ... Quarter wave plate 202 ... Phase conjugate reproduction mirror 203 ... Phase conjugate reproduction mirror controller 205 ... imaging unit, 401, 402, 403 ... angle, 404, 405 ... period, 501 ... polygon mirror, 601 ... galvanometer mirror.
  • PBS Polarizing beam splitter

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  • Optical Recording Or Reproduction (AREA)

Abstract

An optical information record-play device comprises a first controller unit, a reflector element, a second controller unit, and an image capture unit. The first controller unit controls a recording medium, whereon information is recorded as a hologram by interference between an information beam which includes the information that is recorded and which is emitted by a coherent light source and a reference beam having the same wavelength as that of the information beam, to rotate in a constant direction in a first period. The reflector element reflects the reference beam that passes through the recording medium. The second controller unit controls the reflector element to rotate such that an angle of incidence of a reflected reference beam that is reflected from the reflector element to the recording medium is constant in a second period. The image capture element captures a playback beam of the reflected reference beam passing through the recording medium in a third period within the second period.

Description

光情報記録再生装置及び光情報記録再生方法Optical information recording / reproducing apparatus and optical information recording / reproducing method
　本発明の実施形態は、情報をホログラムとして記録および再生する光情報記録再生装置及び光情報記録再生方法に関する。 Embodiments described herein relate generally to an optical information recording / reproducing apparatus and an optical information recording / reproducing method for recording and reproducing information as a hologram.
　ＣＤ（Compact Disc）やＤＶＤ（Digital Versatile Disc）、ＢＤ（Blu-ray Disc）等に代表される光情報記録媒体は、これまで主としてレーザ光の短波長化および対物レンズの開口数（ＮＡ）の増大により記録密度の増加に対応している。しかしながら、そのいずれもが技術的な理由などにより限界に近づいているといわれており、その他の手段または方式による記録転送レートの増大が要望されている。　
　近年、ホログラムを用いた体積記録型の高密度記録（以下、「ＨＤＳ：Holographic Digital Storage」という）およびＨＤＳの記録再生装置が開発されつつある。ＤＶＤなどのように記録面上に記録マークを記録する、いわゆる面記録方式に対して、ホログラム光ディスクは、情報記録層の厚み方向への記録が可能な体積記録方式であるため、ＤＶＤなどに比べて大きな記録密度を得ることができる。　
　ＨＤＳの記録密度を増大させる方法の一つに、角度多重記録方式がある。この角度多重記録方式は、従来のＣＤまたはＤＶＤなどには見られなかった方式であり、二光束干渉方式においては重要な記録方式である。二光束干渉方式は、記録される情報を保持する情報光と、情報光と同一の波長であって一般的には情報光と同一光源から生成される参照光との干渉位置に生じる２次元バーコード状の干渉縞で表される情報（以下、ページデータという）を、光情報記録媒体の情報記録層に記録する方式である。また、角度多重記録された光情報記録媒体からページデータを再生する場合、位相共役再生という手法を用いることにより、光情報記録再生装置を小型化することができる。 Optical information recording media represented by CDs (Compact Discs), DVDs (Digital Versatile Discs), BDs (Blu-ray Discs), etc. have hitherto been used mainly for shortening the wavelength of laser light and the numerical aperture (NA) of objective lenses. The increase corresponds to the increase in recording density. However, all of them are said to be approaching the limits due to technical reasons and the like, and an increase in the recording transfer rate by other means or methods is desired.
In recent years, volume recording type high-density recording (hereinafter referred to as “HDS: Holographic Digital Storage”) using a hologram and an HDS recording / reproducing apparatus are being developed. In contrast to the so-called surface recording method, in which recording marks are recorded on the recording surface, such as a DVD, the hologram optical disk is a volume recording method capable of recording in the thickness direction of the information recording layer. Large recording density can be obtained.
One method for increasing the recording density of HDS is an angle multiplex recording method. This angle multiplex recording method is a method that has not been seen in conventional CDs or DVDs, and is an important recording method in the two-beam interference method. The two-beam interference method is a two-dimensional bar generated at an interference position between information light that holds information to be recorded and reference light that has the same wavelength as the information light and is generally generated from the same light source. In this method, information expressed by code-like interference fringes (hereinafter referred to as page data) is recorded on an information recording layer of an optical information recording medium. In addition, when reproducing page data from an angle-multiplexed optical information recording medium, the optical information recording / reproducing apparatus can be miniaturized by using a technique called phase conjugate reproduction.
米国特許出願公開２００６／０２７９８２３号明細書US Patent Application Publication No. 2006/0279823 特開平０５－１６５３９０号公報JP 05-165390 A
　しかしながら、二光束干渉方式で記録されたデータの再生を行う場合は、光情報記録媒体に対して、レーザ光を記録時と同じ角度で入射させなければならず、角度多重記録が行われた光情報記録媒体に対する角度精度は、非常に高い精度が要求される。例えば、光情報記録媒体の角度を変化させて角度多重記録を行うとき、多重角度間隔が０．１度以下である場合は、角度精度は０．０２５度以下であることが望まれる。さらに、角度多重記録を行うためには、回転動作と停止動作とを間欠的に行う必要がある。この場合の回転および停止といった制御時間は、データ転送レートに直接影響するため、できるだけ早く回転し、できるだけ早く静止させる必要がある。しかしながら、光情報記録媒体は比較的大きくて重く、記録媒体自体の剛性もそれほどないため、角度精度、回転および静止速度を全て満足させることが非常に難しい。　
　本開示は、上述の課題を解決するためになされたものであり、位相共役再生時のデータ転送レートを高くすることができる光情報記録再生装置及び光情報記録再生方法を提供することを目的とする。 However, when reproducing the data recorded by the two-beam interference method, the laser light must be incident on the optical information recording medium at the same angle as that at the time of recording. The angle accuracy with respect to the information recording medium is required to be very high. For example, when angle multiplex recording is performed by changing the angle of the optical information recording medium, if the multiplex angle interval is 0.1 degrees or less, the angle accuracy is desirably 0.025 degrees or less. Further, in order to perform angle multiplex recording, it is necessary to intermittently perform a rotation operation and a stop operation. Since the control time such as rotation and stop in this case directly affects the data transfer rate, it is necessary to rotate as fast as possible and stop as fast as possible. However, since the optical information recording medium is relatively large and heavy, and the recording medium itself does not have much rigidity, it is very difficult to satisfy all of the angular accuracy, rotation, and stationary speed.
The present disclosure has been made to solve the above-described problem, and an object thereof is to provide an optical information recording / reproducing apparatus and an optical information recording / reproducing method capable of increasing a data transfer rate during phase conjugate reproduction. To do.
　本実施形態に係る光情報記録再生装置は、第１制御部と、反射素子と、第２制御部と、撮像部とを含む。第１制御部は、可干渉性の光源より射出される、記録される情報を含む情報光と該情報光に同一な波長の参照光とが干渉することにより、ホログラムとして該情報が記録される記録媒体を第１期間一定方向に回転するように制御する。反射素子は、前記記録媒体を透過した前記参照光を反射する。第２制御部は、前記反射素子により反射した反射参照光の前記記録媒体への入射角が第２期間一定となるように前記反射素子を回転させて制御する。撮像部は、前記反射参照光が前記記録媒体を透過した再生光を、前記第２期間中の第３期間で撮像する。 The optical information recording / reproducing apparatus according to the present embodiment includes a first control unit, a reflective element, a second control unit, and an imaging unit. The first control unit records the information as a hologram when information light including information to be recorded emitted from a coherent light source interferes with reference light having the same wavelength as the information light. The recording medium is controlled to rotate in a certain direction for the first period. The reflective element reflects the reference light transmitted through the recording medium. The second control unit controls the reflection element by rotating the reflection element so that an incident angle of the reflected reference light reflected by the reflection element to the recording medium is constant for a second period. An imaging part images the reproduction | regeneration light which the said reflected reference light permeate | transmitted the said recording medium in the 3rd period in the said 2nd period.
第１の実施形態に係る光情報記録再生装置を示すブロック図。1 is a block diagram showing an optical information recording / reproducing apparatus according to a first embodiment. 記録再生時における光情報記録再生装置を示す図。The figure which shows the optical information recording and reproducing apparatus at the time of recording and reproducing. 第１の実施形態に係る位相共役再生用ミラーの動作の一例を示す図。FIG. 5 is a diagram illustrating an example of the operation of the phase conjugate reproducing mirror according to the first embodiment. 参照光の光情報記録媒体への入射角と時間との関係を示す図。The figure which shows the relationship between the incident angle to the optical information recording medium of reference light, and time. 第１の実施形態の変形例に係る位相共役再生用ミラーの一例を示す図。FIG. 6 is a diagram illustrating an example of a phase conjugate reproducing mirror according to a modification of the first embodiment. ガルバノミラーを用いた場合の位相共役再生を示す図。The figure which shows the phase conjugate reproduction | regeneration at the time of using a galvanometer mirror.
　以下、図面を参照しながら本実施形態に係る光情報記録再生装置および光情報記録再生方法について詳細に説明する。なお、以下の実施形態では、同一の参照符号を付した部分は同様の動作をおこなうものとして、重複する説明を適宜省略する。　
　なお、本実施形態では、情報光と参照光とが別々の対物レンズなどを経て光情報記録媒体中の情報記録層において干渉するように入射される方式である、二光束方式の光学系を採用する。 Hereinafter, an optical information recording / reproducing apparatus and an optical information recording / reproducing method according to the present embodiment will be described in detail with reference to the drawings. Note that, in the following embodiments, the same reference numerals are assigned to the same operations, and duplicate descriptions are omitted as appropriate.
In the present embodiment, a two-beam optical system is used, in which the information light and the reference light are incident so as to interfere with each other in the information recording layer in the optical information recording medium via separate objective lenses. To do.
　（第１の実施形態）　
　第１の実施形態に係る光情報記録再生装置について図１を参照して説明する。　
　第１の実施形態に係る光情報記録再生装置１００は、レーザ光源１０１、シャッタ１０２，１０４、偏光ビームスプリッタ１０３，１０６、リレーレンズ１０５，１０８，１１４、空間光変調部１０７、アパーチャ１０９、対物レンズ１１０、半波長板１１１，１１６、反射ミラー１１２，１１３、システムコントローラ１１５、及びアクチュエータ１１６を含む。この光情報記録再生装置１００を用いて、光情報記録媒体１５０に情報を記録する。なお、システムコントローラ１１５とアクチュエータ１１６とを合わせて第１制御部とも呼ぶ。 (First embodiment)
An optical information recording / reproducing apparatus according to a first embodiment will be described with reference to FIG.
An optical information recording / reproducing apparatus 100 according to the first embodiment includes a laser light source 101, shutters 102 and 104, polarization beam splitters 103 and 106, relay lenses 105, 108, and 114, a spatial light modulator 107, an aperture 109, and an objective lens. 110, half- wave plates 111 and 116, reflection mirrors 112 and 113, a system controller 115, and an actuator 116. Information is recorded on the optical information recording medium 150 using the optical information recording / reproducing apparatus 100. The system controller 115 and the actuator 116 are also collectively referred to as a first control unit.
　光情報記録媒体１５０は、フォトポリマーがガラス基板などにより０．２ｍｍから２．０ｍｍの厚さで挟まれている。これにより、光情報記録媒体１５０に情報記録層が形成されている。この情報記録層に光が当たると、その部分の屈折率が変化する。これにより、情報光と参照光との二光束干渉の結果、光の強度分布が干渉縞による屈折率変化として書き込まれる。すなわち、情報はこの屈折率変化として光情報記録媒体１５０に記録される。　
　レーザ光源１０１は、記録および再生用のレーザ光を射出する光源であり、一般には緑色や青紫色の半導体レーザおよび波長を安定させるための外部共振器（図示せず）を組み合わせて用いる。なお、レーザ光源１０１として、その他の波長や、いわゆるＤＦＢレーザ、ＳＨＧレーザ、固体レーザ、および気体レーザなどのレーザ光を射出するような光源を用いてもよい。　
　シャッタ１０２，１０４は、開閉することにより光を通過させるかまたは光を遮断する。　
　偏光ビームスプリッタ（以下、ＰＢＳともいう）１０３，１０６は、レーザ光を２つの光束に分割する。なお、ＰＢＳ１０３，１０６により分割された光束は、互いに偏光方向が９０度異なるＳ偏光とＰ偏光とになる。　
　リレーレンズ１０５，１０８，及び１１４は、２つ以上のレンズの組み合わせであり、ビーム径を拡大して平行光とする。 In the optical information recording medium 150, a photopolymer is sandwiched by a glass substrate or the like with a thickness of 0.2 mm to 2.0 mm. Thereby, an information recording layer is formed on the optical information recording medium 150. When light strikes this information recording layer, the refractive index of that portion changes. Thereby, as a result of the two-beam interference between the information light and the reference light, the light intensity distribution is written as a change in the refractive index due to the interference fringes. That is, information is recorded on the optical information recording medium 150 as this refractive index change.
The laser light source 101 is a light source that emits laser light for recording and reproduction, and generally uses a combination of a green or blue-violet semiconductor laser and an external resonator (not shown) for stabilizing the wavelength. Note that the laser light source 101 may be a light source that emits laser light such as other wavelengths or a so-called DFB laser, SHG laser, solid-state laser, and gas laser.
The shutters 102 and 104 open or close to allow light to pass or block light.
Polarization beam splitters (hereinafter also referred to as PBSs) 103 and 106 split the laser light into two light beams. Note that the light beams divided by the PBSs 103 and 106 become S-polarized light and P-polarized light whose polarization directions are different from each other by 90 degrees.
The relay lenses 105, 108, and 114 are a combination of two or more lenses, and the beam diameter is enlarged to be parallel light.
　空間光変調部１０７は、例えば、強誘電体型反射型液晶表示装置（ＦＬＣＯＳ）、透過型液晶表示装置、ＤＭＤ（デジタル・マイクロミラー・デバイス）などであり、レーザ光を空間的に変調してページデータを担持する情報光を生成する。　
　アパーチャ１０９は、リレーレンズ１０８に入射した光が、リレーレンズ１０８を通過する前に一旦集光する場所に設置される。　
　対物レンズ１１０は、情報光を光情報記録媒体１５０に集光するために用いられる。　
　半波長板１１１，１１６は、光の偏光を変換する。具体的には、Ｓ偏光からＰ偏光へ、Ｐ偏光からＳ偏光へと相互に変換する。　
　反射ミラー１１２，１１３は、光を反射する。　
　システムコントローラ１１５は、アクチュエータ１１６の動作を制御する制御信号を生成する。　
　アクチュエータ１１６は、システムコントローラ１１５から制御信号を受け取り、制御信号に従って光情報記録媒体１５０の駆動を制御する。アクチュエータ１１６の具体的な動作については後述する。 The spatial light modulator 107 is, for example, a ferroelectric reflective liquid crystal display device (FLCOS), a transmissive liquid crystal display device, a DMD (digital micromirror device), and the like, and spatially modulates laser light to generate a page. Information light carrying data is generated.
The aperture 109 is installed at a place where the light incident on the relay lens 108 is once condensed before passing through the relay lens 108.
The objective lens 110 is used to collect information light on the optical information recording medium 150.
The half- wave plates 111 and 116 convert the polarization of light. Specifically, mutual conversion is performed from S-polarized light to P-polarized light and from P-polarized light to S-polarized light.
The reflection mirrors 112 and 113 reflect light.
The system controller 115 generates a control signal that controls the operation of the actuator 116.
The actuator 116 receives a control signal from the system controller 115 and controls driving of the optical information recording medium 150 according to the control signal. Specific operation of the actuator 116 will be described later.
　＜情報記録方法＞　
　次に、光情報記録再生装置１００による光情報記録媒体１５０への情報記録方法について説明する。　
　レーザ光源１０１から発生した平行光は、シャッタ１０２を通過し、偏光ビームスプリッタ１０３に入射する。入射された平行光は、偏光ビームスプリッタ１０３によって、Ｓ偏光とＰ偏光とに分割される。Ｓ偏光は偏光ビームスプリッタ１０３で反射されて情報光として用いられ、Ｐ偏光は透過して参照光として用いられる。　
　反射したＳ偏光はシャッタ１０４を通過し、リレーレンズ１０５に入射する。リレーレンズ１０５において、Ｓ偏光は、ある程度均一な強度で空間光変調部１０７に入射するように情報光のビーム径が拡大される。その後、ビーム径が拡大された情報光はＰＢＳ１０６で反射されて空間光変調部１０７に入射し、空間光変調部１０７によってページデータで偏光変調される。具体的には、ＯＦＦビットはＳ偏光のまま出力され、ＯＮビットはＰ偏光に変調される。　
　空間光変調部１０７によって変調された情報光は、ＰＢＳ１０６を通過する際に、ＯＮビットが透過、ＯＦＦビットが反射されることにより振幅変調される。振幅変調された情報光のビーム径は、リレーレンズ１０８によって対物レンズ１１０の入射径の大きさに合わせて調整される。 <Information recording method>
Next, a method for recording information on the optical information recording medium 150 by the optical information recording / reproducing apparatus 100 will be described.
Parallel light generated from the laser light source 101 passes through the shutter 102 and enters the polarization beam splitter 103. The incident parallel light is split into S-polarized light and P-polarized light by the polarization beam splitter 103. S-polarized light is reflected by the polarization beam splitter 103 and used as information light, and P-polarized light is transmitted and used as reference light.
The reflected S-polarized light passes through the shutter 104 and enters the relay lens 105. In the relay lens 105, the beam diameter of the information light is expanded so that the S-polarized light is incident on the spatial light modulator 107 with a certain degree of uniform intensity. After that, the information light whose beam diameter has been enlarged is reflected by the PBS 106 and enters the spatial light modulator 107, and is polarization-modulated by the spatial light modulator 107 with page data. Specifically, the OFF bit is output as S-polarized light, and the ON bit is modulated into P-polarized light.
When the information light modulated by the spatial light modulator 107 passes through the PBS 106, the information light is amplitude-modulated by transmitting the ON bit and reflecting the OFF bit. The beam diameter of the amplitude-modulated information light is adjusted by the relay lens 108 in accordance with the incident diameter of the objective lens 110.
　また、リレーレンズ１０８において、一旦情報光が集光する場所にアパーチャ１０９が設置される。情報光が集光する場所は、情報光が空間光変調部１０７とＰＢＳ１０６とにより変調された強度分布のフーリエ変換面である。情報光のフーリエ変換像は、光情報記録媒体１５０付近の集光位置の情報光と共役な関係になっており、アパーチャ１０９の大きさによって、光情報記録媒体１５０に入射される位置付近での情報光の大きさが決まる。光情報記録媒体１５０に情報を記録する際には、光情報記録媒体１５０の媒体平面に平行な方向にもあるステップ間隔で記録することも考慮すれば、光情報記録媒体１５０付近での情報光の大きさが小さいほど、小さなステップで記録することができ、記録密度を高めることができる。従って、アパーチャ１０９の大きさは、システムが許容できる再生像が得られる範囲で、できるだけ小さくすることが望ましい。　
　リレーレンズ１０８を通過した情報光は、半波長板１１６に入射され、Ｐ偏光からＳ偏光へ変換される。Ｓ偏光に変換された情報光は、対物レンズ１１０に入射してレンズパワーを与えられて光情報記録媒体１５０に集光する。なお、情報光の集光位置は、光情報記録媒体１５０の内部に限らず、光情報記録媒体１５０の外部でもよい。 In the relay lens 108, an aperture 109 is once installed at a place where information light is once condensed. The place where the information light is collected is the Fourier transform plane of the intensity distribution in which the information light is modulated by the spatial light modulator 107 and the PBS 106. The Fourier transform image of the information light has a conjugate relationship with the information light at the condensing position in the vicinity of the optical information recording medium 150. Depending on the size of the aperture 109, the Fourier transform image of the information light near the position incident on the optical information recording medium 150 is obtained. The size of the information light is determined. When recording information on the optical information recording medium 150, the information light in the vicinity of the optical information recording medium 150 can be taken into consideration if recording is performed at a step interval that is also parallel to the medium plane of the optical information recording medium 150. The smaller the size is, the smaller the step can be recorded, and the higher the recording density is. Therefore, it is desirable to make the size of the aperture 109 as small as possible within a range where a reproduced image acceptable by the system can be obtained.
The information light that has passed through the relay lens 108 enters the half-wave plate 116 and is converted from P-polarized light to S-polarized light. The information light converted into S-polarized light is incident on the objective lens 110 and given a lens power, and is condensed on the optical information recording medium 150. Note that the condensing position of the information light is not limited to the inside of the optical information recording medium 150 but may be outside the optical information recording medium 150.
　一方、ＰＢＳ１０３を透過した参照光は、半波長板１１１によってＳ偏光に変換される。Ｓ偏光に変換された参照光は、反射ミラー１１２および反射ミラー１１３によって反射されてリレーレンズ１１４に入射する。入射した参照光は、リレーレンズ１１４によって光情報記録媒体１５０上での情報光のビーム径とほぼ同じビーム径に変換される。その後参照光は、情報光が入射した光情報記録媒体１５０の位置と同じ位置に入射する。このとき情報光と参照光とが干渉して干渉縞を生じ、干渉縞は光情報記録媒体１５０の情報記録層に屈折率変化として書き込まれる。なお、情報光の集光位置が光情報記録媒体１５０の外部にある場合は、情報光の集光位置の前（収束光）または後（発散光）と参照光とにより干渉縞を生じさせ、情報記録層に屈折率変化として情報を記録することも可能である。 On the other hand, the reference light transmitted through the PBS 103 is converted into S-polarized light by the half-wave plate 111. The reference light converted to S-polarized light is reflected by the reflection mirror 112 and the reflection mirror 113 and enters the relay lens 114. The incident reference light is converted by the relay lens 114 into a beam diameter that is substantially the same as the beam diameter of the information light on the optical information recording medium 150. Thereafter, the reference light is incident on the same position as the position of the optical information recording medium 150 on which the information light is incident. At this time, the information light and the reference light interfere to generate interference fringes, and the interference fringes are written in the information recording layer of the optical information recording medium 150 as a refractive index change. When the information light condensing position is outside the optical information recording medium 150, interference fringes are generated by the reference light before (converging light) or after (diverging light) the information light condensing position, It is also possible to record information as a change in refractive index in the information recording layer.
　ここで、光情報記録媒体１５０の情報記録層に固定したｘｙｚ直交座標系を考える。情報光と参照光とによる情報記録層の媒体面における記録スポットを原点として、光情報記録媒体１５０の厚み方向（すなわち、媒体面に垂直な方向）にｚ軸を、それに直交する方向、すなわち情報記録層の面方向に、互いに直交するｘ軸とｙ軸とをとる。　
　本実施形態にかかる光情報記録再生装置１００は、角度多重記録を行う場合には、光情報記録媒体１５０をｙ軸周り（面内軸周り）に回転させて角度変化させながらθｙの多重記録を行う。なお、θｙは、角度多重記録の際に光情報記録媒体１５０を回転させる単位角度である。具体的には、システムコントローラ１１５が、アクチュエータ１１６を動作させ、光情報記録媒体１５０をｙ軸周りにθｙステップ（Δθｙ）ずつ回転（以下、θｙ回転という）させ、各θｙステップにおいて情報光と参照光とを光情報記録媒体１５０に同時に照射して情報を記録していく。θｙ回転により、情報光および参照光と光情報記録媒体１５０との間の相対角度が変化し、異なるページデータが記録される。　
　なお、本実施形態では、θｙ多重記録を行うが、これに限定されるものではない。例えば、光情報記録媒体１５０を、ｚ軸周りにθｚステップ（Δθｚ）ずつ回転（以下、θｚ回転という）させながら情報を記録するθｚ多重記録を行ってもよい。また、θｙ多重記録とθｚ多重記録とを併用した記録方式を採用してもよい。また、θｙステップとθｚステップとは常に一定である必要はなく、参照光の入射角に応じてステップ幅を変化させてもよい。 Here, an xyz orthogonal coordinate system fixed to the information recording layer of the optical information recording medium 150 is considered. Using the recording spot on the medium surface of the information recording layer by the information light and the reference light as the origin, the z-axis is perpendicular to the thickness direction of the optical information recording medium 150 (that is, the direction perpendicular to the medium surface), that is, information An x-axis and a y-axis perpendicular to each other are taken in the surface direction of the recording layer.
When performing angle multiplex recording, the optical information recording / reproducing apparatus 100 according to the present embodiment performs multiple recording of θy while changing the angle by rotating the optical information recording medium 150 around the y axis (around the in-plane axis). Do. Note that θy is a unit angle for rotating the optical information recording medium 150 in angle multiplexing recording. Specifically, the system controller 115 operates the actuator 116 to rotate the optical information recording medium 150 about the y axis by θy steps (Δθy) (hereinafter referred to as θy rotation), and refers to the information light at each θy step. Information is recorded by simultaneously irradiating the optical information recording medium 150 with light. By rotating θy, the relative angle between the information light and the reference light and the optical information recording medium 150 changes, and different page data is recorded.
In this embodiment, θy multiplex recording is performed, but the present invention is not limited to this. For example, θz multiplex recording may be performed in which information is recorded while the optical information recording medium 150 is rotated by θz steps (Δθz) around the z axis (hereinafter referred to as θz rotation). Further, a recording method using both θy multiplex recording and θz multiplex recording may be employed. Further, the θy step and the θz step need not always be constant, and the step width may be changed according to the incident angle of the reference light.
　＜情報再生方法＞　
　次に、情報再生時の光情報記録再生装置２００について図２のブロック図を参照して説明する。　
　ここでは、角度多重記録方式でページデータが記録された場合を想定する。角度多重記録方式は、光情報記録媒体に入射する参照光の角度を変える場合と、光情報記録媒体自体の角度を変える場合とがある。後者のように光情報記録媒体の角度を変えて多重記録されたページデータを連続して再生する場合、記録されたときと同じ角度となるように光情報記録媒体の角度を制御し、ページデータの再生に問題がない位置に停止したときに、ミラーにより反射されて光情報記録媒体に再入射した参照光（以下、反射参照光と呼ぶ）によりページデータの再生を行う。続いて、隣接したページを記録した角度となるように光情報記録媒体を制御し、同じようにページデータの再生に問題がない位置に停止したときに、隣接したページデータの再生を行う。 <Information playback method>
Next, the optical information recording / reproducing apparatus 200 during information reproduction will be described with reference to the block diagram of FIG.
Here, it is assumed that page data is recorded by the angle multiplex recording method. In the angle multiplexing recording method, there are a case where the angle of the reference light incident on the optical information recording medium is changed and a case where the angle of the optical information recording medium itself is changed. In the latter case, when the page data recorded in a multiplexed manner is changed by changing the angle of the optical information recording medium, the angle of the optical information recording medium is controlled so that the angle is the same as the recorded page data. When the reproduction stops at a position where there is no problem in reproduction, page data is reproduced by reference light reflected by the mirror and re-entered on the optical information recording medium (hereinafter referred to as reflected reference light). Subsequently, the optical information recording medium is controlled so as to have an angle at which the adjacent page is recorded. Similarly, when the page is stopped at a position where there is no problem in reproducing the page data, the adjacent page data is reproduced.
　光情報記録再生装置２００は、図１に示す光情報記録再生装置１００の構成に加え、４分の１波長板２０１、位相共役再生用ミラー２０２、位相共役再生用ミラー制御部２０３、アクチュエータ２０４、および撮像部２０５を含む。なお、位相共役再生用ミラー制御部２０３とアクチュエータ２０４とを合わせて第２制御部とも呼ぶ。　
　４分の１波長板２０１は、参照光の偏光を変換する。　
　位相共役再生用ミラー２０２は、例えばガルバノミラーであり、参照光の位相が共役となるように参照光を反射する。　
　位相共役再生用ミラー制御部２０３は、アクチュエータ２０４を動作させる制御信号を生成する。　
　アクチュエータ２０４は、位相共役再生用ミラー制御部２０３から制御信号を受け取り、位相共役再生用ミラー２０２の角度を制御する。　
　撮像部２０５は、例えばＣＭＯＳセンサで構成される受光素子であり、光情報記録媒体１５０に記録されたページデータを撮像する。 In addition to the configuration of the optical information recording / reproducing apparatus 100 shown in FIG. 1, the optical information recording / reproducing apparatus 200 includes a quarter-wave plate 201, a phase conjugate reproducing mirror 202, a phase conjugate reproducing mirror control unit 203, an actuator 204, And an imaging unit 205. The phase conjugate reproduction mirror control unit 203 and the actuator 204 are collectively referred to as a second control unit.
The quarter wave plate 201 converts the polarization of the reference light.
The phase conjugate reproduction mirror 202 is, for example, a galvanometer mirror, and reflects the reference light so that the phase of the reference light is conjugate.
The phase conjugate reproduction mirror control unit 203 generates a control signal for operating the actuator 204.
The actuator 204 receives a control signal from the phase conjugate reproduction mirror control unit 203 and controls the angle of the phase conjugate reproduction mirror 202.
The imaging unit 205 is a light receiving element configured by, for example, a CMOS sensor, and images page data recorded on the optical information recording medium 150.
　続いて、第１の実施形態に係る光情報記録再生装置１００の基本的な情報再生動作について説明する。　
　なお、ここでは図示しないが、光情報記録媒体１５０をθｙ回転駆動させたり、ｘ－ｙ平面内をスキャンさせたりする媒体移動機構を含んでもよい。また、図示しないが、媒体移動機構を制御する駆動制御部または撮像部２０５の出力を処理する信号処理部を含んでもよい。　
　レーザ光源１０１から射出された平行光は、シャッタ１０２を通過し、ＰＢＳ１０３に入射する。ＰＢＳ１０３において、Ｓ偏光が反射し、Ｐ偏光が透過する。ここで、Ｓ偏光はシャッタ１０４を閉じることにより遮光される。一方、Ｐ偏光は参照光として用いられる。透過した参照光は、半波長板１１１によってＳ偏光に変換され、反射ミラー１１２および反射ミラー１１３によって反射されてリレーレンズ１１４に入射する。参照光は、リレーレンズ１１４によって所望のビーム径に拡大または縮小されて光情報記録媒体１５０に入射する。 Subsequently, a basic information reproducing operation of the optical information recording / reproducing apparatus 100 according to the first embodiment will be described.
Although not shown here, a medium moving mechanism that rotates the optical information recording medium 150 by θy rotation or scans in the xy plane may be included. Further, although not shown, a drive control unit that controls the medium moving mechanism or a signal processing unit that processes the output of the imaging unit 205 may be included.
The parallel light emitted from the laser light source 101 passes through the shutter 102 and enters the PBS 103. In the PBS 103, S-polarized light is reflected and P-polarized light is transmitted. Here, the S-polarized light is shielded by closing the shutter 104. On the other hand, P-polarized light is used as reference light. The transmitted reference light is converted to S-polarized light by the half-wave plate 111, reflected by the reflection mirror 112 and the reflection mirror 113, and enters the relay lens 114. The reference light is enlarged or reduced to a desired beam diameter by the relay lens 114 and enters the optical information recording medium 150.
　光情報記録媒体１５０に入射された参照光は、光情報記録媒体１５０を透過し、４分の１波長板２０１を透過して位相共役再生用ミラー２０２で反射する。位相共役再生用ミラー２０２からの反射参照光は、再び、４分の１波長板２０１を透過してＰ偏光に変換される。　
　Ｐ偏光に変換された参照光は、光情報記録媒体１５０を再び透過するが、このとき光情報記録媒体１５０への入射角が記録時と等しくなるように調整されて再生光が再生される。なお、参照光がＰ偏光であるため、再生光もＰ偏光である。再生光は、対物レンズ１１０を通過し、半波長板１１６を透過してＳ偏光に変換され、リレーレンズ１０８およびアパーチャ１０９によって、ビーム径が拡大または縮小され、ＰＢＳ１０６によって反射される。その後再生光は、撮像部２０５に入射されて撮像され、再生されたページデータが取得される。 The reference light incident on the optical information recording medium 150 passes through the optical information recording medium 150, passes through the quarter-wave plate 201, and is reflected by the phase conjugate reproducing mirror 202. The reflected reference light from the phase conjugate reproducing mirror 202 is again transmitted through the quarter-wave plate 201 and converted to P-polarized light.
The reference light converted into the P-polarized light is transmitted again through the optical information recording medium 150. At this time, the incident light to the optical information recording medium 150 is adjusted to be equal to that at the time of recording, and the reproduction light is reproduced. Since the reference light is P-polarized light, the reproduction light is also P-polarized light. The reproduction light passes through the objective lens 110, passes through the half-wave plate 116, is converted into S-polarized light, the beam diameter is enlarged or reduced by the relay lens 108 and the aperture 109, and is reflected by the PBS 106. Thereafter, the reproduction light is incident on the imaging unit 205 and picked up, and reproduced page data is acquired.
　次に、光情報記録媒体１５０をｙ軸中心で角度変化させることで多重記録されたデータを再生する方法について図３および図４を参照して説明する。　
　図３は、位相共役再生用ミラー２０２からの反射参照光の角度変化と、光情報記録媒体および位相共役再生用ミラー２０２の回転動作の時系列とを示す図である。図３（ａ）から図３（ｃ）までは、光情報記録媒体１５０への参照光の入射角がθｙ１で情報が記録されたページ１を再生する場合、図３（ｄ）から図３（ｆ）までは、光情報記録媒体１５０への参照光の入射角がθｙ２で情報が記録されたページ２を再生する場合である。 Next, a method for reproducing multiplexed data by changing the angle of the optical information recording medium 150 about the y-axis center will be described with reference to FIGS.
FIG. 3 is a diagram showing an angle change of the reflected reference light from the phase conjugate reproduction mirror 202 and a time series of the rotation operations of the optical information recording medium and the phase conjugate reproduction mirror 202. From FIG. 3A to FIG. 3C, when reproducing page 1 on which information is recorded with the incident angle of the reference light to the optical information recording medium 150 being θy1, FIG. 3D to FIG. Up to f) is the case where the page 2 on which information is recorded with the incident angle of the reference light to the optical information recording medium 150 being θy2 is reproduced.
　図３（ａ）から図３（ｆ）までに示すように、光情報記録媒体１５０はｙ軸周りの一定方向（ここでは時計回り）に、角速度を一定に保って回転する。参照光の光情報記録媒体１５０への入射角が、ページ１が記録された入射角θｙ１に近づくと、位相共役再生用ミラー２０２を制御して、反射参照光の光情報記録媒体１５０への入射角がθｙ１となるように回転させる。具体例としては、光情報記録媒体１５０が回転する角速度の半分の角速度で、位相共役再生用ミラー２０２を光情報記録媒体１５０と同一方向に回転させ、位相共役再生用ミラー２０２からの反射参照光の光情報記録媒体１５０への入射角θｙ１を一定に保つことができる。　
　光情報記録媒体１５０が続けて回転を行うと、反射参照光の光情報記録媒体１５０への入射角がθｙ１からθｙ２に近づいていく。θｙ２に近づいたときに、図３（ｃ）から図３（ｄ）に示すようなページジャンプを行う。具体的には、反射参照光の光情報記録媒体１５０への入射角がθｙ１で一定となるように回転している位相共役再生用ミラー２０２を、図３（ｄ）に示すように逆回転させ、反射参照光の光情報記録媒体１５０への入射角がθｙ２となるように位相共役再生用ミラー２０２を制御する。その後、図３（ｅ）および図３（ｆ）に示すように、反射参照光の光情報記録媒体１５０への入射角θｙ２を一定に保つように、光情報記録媒体１５０と同一方向に位相共役再生用ミラー２０２を回転させる。 As shown in FIGS. 3A to 3F, the optical information recording medium 150 rotates in a certain direction around the y axis (clockwise in this case) while keeping the angular velocity constant. When the incident angle of the reference light on the optical information recording medium 150 approaches the incident angle θy1 at which the page 1 is recorded, the phase conjugate reproduction mirror 202 is controlled so that the reflected reference light enters the optical information recording medium 150. Rotate so that the angle is θy1. As a specific example, the phase conjugate reproduction mirror 202 is rotated in the same direction as the optical information recording medium 150 at an angular velocity that is half the angular velocity at which the optical information recording medium 150 rotates, and the reflected reference light from the phase conjugate reproduction mirror 202 is reflected. The incident angle θy1 to the optical information recording medium 150 can be kept constant.
When the optical information recording medium 150 continues to rotate, the incident angle of the reflected reference light to the optical information recording medium 150 approaches from θy1 to θy2. When approaching θy2, page jump as shown in FIG. 3C to FIG. 3D is performed. Specifically, the phase conjugate reproducing mirror 202 rotating so that the incident angle of the reflected reference light to the optical information recording medium 150 is constant at θy1 is reversely rotated as shown in FIG. Then, the phase conjugate reproduction mirror 202 is controlled so that the incident angle of the reflected reference light to the optical information recording medium 150 becomes θy2. Thereafter, as shown in FIGS. 3E and 3F, the phase conjugate in the same direction as the optical information recording medium 150 so as to keep the incident angle θy2 of the reflected reference light to the optical information recording medium 150 constant. The reproduction mirror 202 is rotated.
　次に、図３（ａ）から図３（ｆ）までの参照光の光情報記録媒体１５０への入射角と、反射参照光の光情報記録媒体１５０への入射角との時間変化を図４に示す。　
　図４中の（ａ）から（ｆ）までが、図３（ａ）から図３（ｆ）までの時系列にそれぞれ対応する。　
　角度４０１および角度４０２は、反射参照光の光情報記録媒体１５０への入射角であり、角度４０１は入射角θｙ１、角度４０２は入射角θｙ２をそれぞれ示す。角度４０３は、参照光の光情報記録媒体１５０への入射角を示す。なお、（ｃ）と（ｄ）との間でページジャンプが発生したとする。期間４０４および期間４０５は、ページ１およびページ２のそれぞれのページデータの読み出し期間を示す。　
　光情報記録媒体１５０は一定方向に連続して回転するため、角度４０３は時間に比例して大きくなる。それに応じて、位相共役再生用ミラー２０２の回転を制御することで、反射参照光の光情報記録媒体１５０への入射角を一定に保つ。具体的には、角度４０１および角度４０２に示すように、反射参照光の光情報記録媒体１５０への入射角を（ａ）から（ｃ）までの期間はθｙ１に保ち、（ｄ）から（ｆ）までの期間はθｙ２に保つ。そこで、反射参照光の光情報記録媒体１５０への入射角が一定である期間中、期間４０４および期間４０５においてページの再生光を撮像部２０５で撮像し、記録されたページデータをそれぞれ取得することができる。 Next, the time change of the incident angle of the reference light to the optical information recording medium 150 and the incident angle of the reflected reference light to the optical information recording medium 150 from FIG. 3A to FIG. Shown in
(A) to (f) in FIG. 4 correspond to the time series from FIG. 3 (a) to FIG. 3 (f), respectively.
An angle 401 and an angle 402 are incident angles of the reflected reference light to the optical information recording medium 150. The angle 401 indicates the incident angle θy1 and the angle 402 indicates the incident angle θy2. An angle 403 indicates an incident angle of the reference light to the optical information recording medium 150. It is assumed that a page jump occurs between (c) and (d). A period 404 and a period 405 indicate page data read periods for page 1 and page 2, respectively.
Since the optical information recording medium 150 rotates continuously in a certain direction, the angle 403 increases in proportion to time. Accordingly, by controlling the rotation of the phase conjugate reproduction mirror 202, the incident angle of the reflected reference light to the optical information recording medium 150 is kept constant. Specifically, as indicated by the angles 401 and 402, the incident angle of the reflected reference light to the optical information recording medium 150 is maintained at θy1 during the period from (a) to (c), and from (d) to (f ) Until θy2. Therefore, during the period in which the incident angle of the reflected reference light to the optical information recording medium 150 is constant, the reproduction light of the page is imaged by the imaging unit 205 in the periods 404 and 405, and the recorded page data is acquired respectively. Can do.
　なお、読み出し期間(期間４０４、期間４０５)の設定は、本実施形態ではページの再生光の総輝度が閾値以上となるような期間とするが、これに限定されず、反射参照光の光情報記録媒体１５０への入射角を閾値以内とするなどページデータが再生できるように位相共役再生用ミラー２０２を制御できればよい。 Note that the readout period (period 404, period 405) is set to a period in which the total luminance of the reproduction light of the page is equal to or higher than the threshold in this embodiment, but is not limited to this, and the optical information of the reflected reference light It is sufficient that the phase conjugate reproduction mirror 202 can be controlled so that page data can be reproduced, for example, the incident angle to the recording medium 150 is within a threshold value.
　光情報記録媒体１５０は、比較的大きな媒体となるので、回転の停止または開始といった制御を急速に行うことは難しい。そこで、位相共役再生用ミラー２０２のような光情報記録媒体１５０よりも小さい素子の回転を制御することにより、光情報記録媒体１５０の急速な回転の停止および開始を容易に行うことができる。 Since the optical information recording medium 150 is a relatively large medium, it is difficult to quickly perform control such as stop or start of rotation. Therefore, by controlling the rotation of an element smaller than the optical information recording medium 150 such as the phase conjugate reproducing mirror 202, the rapid rotation stop and start of the optical information recording medium 150 can be easily performed.
　以上に示した第１の実施形態によれば、比較的大きい光情報記録媒体を一定方向に角速度を一定に保って回転させ、光情報記録媒体よりも素子構成が小さい位相共役再生用ミラーの回転を制御することにより、駆動機構の負担を減らすことができる。さらに、位相共役再生用ミラーの回転停止または逆回転といった制御が、光情報記録媒体を制御するよりも容易なため、位相共役再生時の角度精度および制御速度を向上させることができ、結果的に角度多重記録された情報の再生時のデータ転送レートを高くすることができる。 According to the first embodiment described above, a relatively large optical information recording medium is rotated with a constant angular velocity in a certain direction, and the rotation of the phase conjugate reproducing mirror having a smaller element configuration than the optical information recording medium. By controlling this, it is possible to reduce the load on the drive mechanism. Furthermore, since control such as rotation stop or reverse rotation of the phase conjugate reproduction mirror is easier than controlling the optical information recording medium, angle accuracy and control speed during phase conjugate reproduction can be improved. It is possible to increase the data transfer rate at the time of reproducing information recorded by angle multiplexing.
　（第１の実施形態の変形例）　
　第１の実施形態では、位相共役再生用ミラーの鏡面が１面の場合を想定し、情報再生時に位相共役再生用ミラーの回転を制御することで複数のページデータを撮像するが、本変形例では、位相共役再生用ミラーとしてポリゴンミラーを用いる点が異なる。　
　ポリゴンミラーを用いた例について図５を参照して説明する。　
　図５に示すように、多面体であって、鏡面を複数有するポリゴンミラー５０１を位相共役再生用ミラーとして用いる。光情報記録媒体１５０に情報を多重に記録する場合の多重記録角度ステップと、ポリゴンミラー５０１の多面体の面数とを最適化することにより、光情報記録媒体１５０とポリゴンミラー５０１との角速度を一定することができる。例えば、光情報記録媒体１５０の角速度と同じ角速度に設定したり、光情報記録媒体１５０の角速度の半分の角速度に一定に設定すればよい。このようにすることで、光情報記録媒体１５０および位相共役再生用ミラーの回転の停止または逆回転の制御を行わずに、反射参照光の光情報記録媒体１５０への入射角をある期間一定に保ち、ページデータを取得して、次のページへとページジャンプを行う一連の動作を行うことができる。　
　以上に示した第１の実施形態の変形例によれば、光情報記録媒体に情報を多重に記録する場合の多重記録角度ステップと、ポリゴンミラーの多面体の面数とを最適化することにより、それぞれ一定の角速度で回転させたまま自動的にページジャンプを行って、次々とページデータを撮像することができ、情報再生時の制御をさらに容易にすることができる。 (Modification of the first embodiment)
In the first embodiment, assuming that the mirror surface of the phase conjugate reproduction mirror has one mirror surface, a plurality of page data is imaged by controlling the rotation of the phase conjugate reproduction mirror during information reproduction. The difference is that a polygon mirror is used as the phase conjugate reproducing mirror.
An example using a polygon mirror will be described with reference to FIG.
As shown in FIG. 5, a polygon mirror 501 that is a polyhedron and has a plurality of mirror surfaces is used as a phase conjugate reproducing mirror. The angular velocity between the optical information recording medium 150 and the polygon mirror 501 is made constant by optimizing the multiple recording angle step when recording information on the optical information recording medium 150 in a multiplexed manner and the number of faces of the polygon mirror 501. can do. For example, the angular velocity may be set to the same angular velocity as that of the optical information recording medium 150 or may be set to a constant angular velocity that is half the angular velocity of the optical information recording medium 150. By doing so, the incident angle of the reflected reference light to the optical information recording medium 150 is kept constant for a certain period without controlling the stop or reverse rotation of the optical information recording medium 150 and the phase conjugate reproducing mirror. It is possible to perform a series of operations for keeping and acquiring page data and performing page jump to the next page.
According to the modification of the first embodiment shown above, by optimizing the multiple recording angle step in the case of recording information on the optical information recording medium and the number of faces of the polygon mirror polyhedron, Each page data can be taken one after another by automatically performing page jump while rotating at a constant angular velocity, and control during information reproduction can be further facilitated.
　（第２の実施形態）　
　第１の実施形態では、光情報記録媒体１５０を回転させることにより情報光および参照光と光情報記録媒体１１１との間の相対角度を変化させたが、第２の実施形態では、相対角度を変化させるために、参照光の方向を制御する点が異なる。　
　参照光の方向を制御する場合の一例を図６に示す。　
　この場合、固定の反射ミラー１１３に代えてガルバノミラー６０１を設置する。ガルバノミラー６０１の反射面と光情報記録媒体１５０の情報記録層のページデータの記録位置とにおいて共役な関係になるように、リレーレンズ１１４を配する。そして、位相共役再生用ミラー２０２とガルバノミラー６０１とを回転させることにより、光情報記録媒体１５０を固定したまま、相対角度を変化させることができる。 (Second Embodiment)
In the first embodiment, the relative angle between the information light and the reference light and the optical information recording medium 111 is changed by rotating the optical information recording medium 150. However, in the second embodiment, the relative angle is changed. The difference is that the direction of the reference light is controlled in order to change.
An example of controlling the direction of the reference light is shown in FIG.
In this case, a galvanometer mirror 601 is installed instead of the fixed reflection mirror 113. The relay lens 114 is disposed so that the reflection surface of the galvano mirror 601 and the page data recording position of the information recording layer of the optical information recording medium 150 are conjugated. Then, by rotating the phase conjugate reproducing mirror 202 and the galvanometer mirror 601, the relative angle can be changed while the optical information recording medium 150 is fixed.
　以上に示した第２の実施形態によれば、参照光の方向をガルバノミラーなどによって制御することで、光情報記録媒体は固定したまま第１の実施形態と同様の効果を得ることができる。 According to the second embodiment described above, the same effect as that of the first embodiment can be obtained while the optical information recording medium is fixed by controlling the direction of the reference light by a galvanometer mirror or the like.
　本発明のいくつかの実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。 Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.
１００，２００・・・光情報記録再生装置、１０１・・・レーザ光源、１０２，１０４・・・シャッタ、１０３，１０６・・・偏光ビームスプリッタ（ＰＢＳ）、１０５，１０８，１１４・・・リレーレンズ、１０７・・・空間光変調部、１０９・・・アパーチャ、１１０・・・対物レンズ、１１１，１１６・・・半波長板、１１２，１１３・・・反射ミラー、１５０・・・光情報記録媒体、１１５・・・システムコントローラ、１１６，２０４・・・アクチュエータ、２０１・・・４分の１波長板、２０２・・・位相共役再生用ミラー、２０３・・・位相共役再生用ミラー制御部、２０５・・・撮像部、４０１，４０２，４０３・・・角度、４０４，４０５・・・期間、５０１・・・ポリゴンミラー、６０１・・・ガルバノミラー。 DESCRIPTION OF SYMBOLS 100,200 ... Optical information recording / reproducing apparatus, 101 ... Laser light source, 102, 104 ... Shutter, 103, 106 ... Polarizing beam splitter (PBS), 105, 108, 114 ... Relay lens , 107 ... Spatial light modulator, 109 ... Aperture, 110 ... Objective lens, 111, 116 ... Half-wave plate, 112, 113 ... Reflection mirror, 150 ... Optical information recording medium 115 ... System controller 116, 204 ... Actuator 201 ... Quarter wave plate 202 ... Phase conjugate reproduction mirror 203 ... Phase conjugate reproduction mirror controller 205 ... imaging unit, 401, 402, 403 ... angle, 404, 405 ... period, 501 ... polygon mirror, 601 ... galvanometer mirror.

Claims (9)

  1. 　可干渉性の光源より射出される、記録される情報を含む情報光と該情報光に同一な波長の参照光とが干渉することにより、ホログラムとして該情報が記録される記録媒体を第１期間一定方向に回転するように制御する第１制御部と、
    　前記記録媒体を透過した前記参照光を反射する反射素子と、
    　前記反射素子により反射した反射参照光の前記記録媒体への入射角が第２期間一定となるように前記反射素子を回転させて制御する第２制御部と、
    　前記反射参照光が前記記録媒体を透過した再生光を、前記第２期間中の第３期間で撮像する撮像部と、を具備することを特徴とする光情報記録再生装置。     A recording medium on which the information is recorded as a hologram is interfered by information light including information to be recorded emitted from a coherent light source and reference light having the same wavelength as the information light. A first control unit that controls to rotate in a certain direction;
    A reflective element that reflects the reference light transmitted through the recording medium;
    A second control unit that rotates and controls the reflection element so that an incident angle of the reflected reference light reflected by the reflection element to the recording medium is constant for a second period;
    An optical information recording / reproducing apparatus comprising: an imaging unit that captures an image of reproduction light transmitted through the recording medium by the reflected reference light in a third period of the second period.
  2. 　前記第３期間は、前記再生光の総輝度が第１閾値以上である期間とすることを特徴とする請求項１に記載の光情報記録再生装置。 The optical information recording / reproducing apparatus according to claim 1, wherein the third period is a period in which the total luminance of the reproduction light is equal to or greater than a first threshold.
  3. 　前記第３期間は、前記記録媒体への参照光の入射角と前記記録媒体への前記反射参照光の入射角との差が第２閾値以内である期間とすることを特徴とする請求項１に記載の光情報記録再生装置。 2. The third period is a period in which a difference between an incident angle of the reference light to the recording medium and an incident angle of the reflected reference light to the recording medium is within a second threshold. 2. An optical information recording / reproducing apparatus according to 1.
  4. 　前記第２制御部は、記録された情報を読み取る際にページジャンプを行う場合、前記反射素子を逆回転または停止させることを特徴とする請求項１に記載の光情報記録再生装置。 2. The optical information recording / reproducing apparatus according to claim 1, wherein the second control unit reversely rotates or stops the reflecting element when performing a page jump when reading recorded information. 3.
  5. 　前記反射素子は、ガルバノミラーであることを特徴とする請求項１に記載の光情報記録再生装置。 The optical information recording / reproducing apparatus according to claim 1, wherein the reflective element is a galvanometer mirror.
  6. 　前記反射素子は、ポリゴンミラーであることを特徴とする請求項１に記載の光情報記録再生装置。 The optical information recording / reproducing apparatus according to claim 1, wherein the reflective element is a polygon mirror.
  7. 　前記第１制御部は、前記情報光と前記参照光との角度は変化させず、前記記録媒体の角度を一定間隔で変化させることにより、前記情報光および前記参照光と該記録媒体との相対角度を変化させることを特徴とする請求項１に記載の光情報記録再生装置。 The first control unit does not change the angle between the information light and the reference light, and changes the angle of the recording medium at a constant interval, thereby making the relative relation between the information light and the reference light and the recording medium. The optical information recording / reproducing apparatus according to claim 1, wherein the angle is changed.
  8. 　可干渉性の光源より射出される、記録される情報を含む情報光と該情報光と同一波長の参照光とが干渉することにより、ホログラムとして該情報が記録される記録媒体を第１期間固定するように制御する第１制御部と、
    　前記参照光を反射し、前記記録媒体への入射角度を変化させる第１反射素子と、
    　前記記録媒体を透過した前記参照光を反射する第２反射素子と、
    　前記第２反射素子により反射した反射参照光の前記記録媒体への入射角が第２期間一定となるように前記第２反射素子を回転させて制御する第２制御部と、
    　前記反射参照光が前記記録媒体を透過した再生光を、前記第２期間中の第３期間で撮像する撮像部と、を具備することを特徴とする光情報記録再生装置。     A recording medium on which information is recorded as a hologram is fixed for a first period by interference of information light including recorded information emitted from a coherent light source and reference light having the same wavelength as the information light. A first control unit that controls to
    A first reflecting element that reflects the reference light and changes an incident angle on the recording medium;
    A second reflective element that reflects the reference light transmitted through the recording medium;
    A second control unit that rotates and controls the second reflective element so that an incident angle of the reflected reference light reflected by the second reflective element to the recording medium is constant for a second period;
    An optical information recording / reproducing apparatus comprising: an imaging unit that captures an image of reproduction light transmitted through the recording medium by the reflected reference light in a third period of the second period.
  9. 　可干渉性の光源より射出される、記録される情報を含む情報光と該情報光に同一な波長の参照光とが干渉することにより、ホログラムとして該情報が記録される記録媒体を第１期間一定方向に回転するように制御し、
    　前記記録媒体を透過した前記参照光を反射する反射素子を用意し、
    　前記反射素子により反射した反射参照光の前記記録媒体への入射角が第２期間一定となるように前記反射素子を回転させて制御し、
    　前記反射参照光が前記記録媒体を透過した再生光を、前記第２期間中の第３期間で撮像することを具備することを特徴とする光情報記録再生方法。     A recording medium on which the information is recorded as a hologram is interfered by information light including information to be recorded emitted from a coherent light source and reference light having the same wavelength as the information light. Control to rotate in a certain direction,
    Providing a reflective element for reflecting the reference light transmitted through the recording medium;
    Rotating and controlling the reflective element so that the incident angle of the reflected reference light reflected by the reflective element to the recording medium is constant for a second period;
    An optical information recording / reproducing method comprising: imaging the reproduction light transmitted through the recording medium by the reflected reference light in a third period of the second period.
PCT/JP2010/065274 2010-09-07 2010-09-07 Optical information record-playback device and optical information record-playback method WO2012032600A1 (en)

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