WO2000077779A1 - Appareil interferentiel a faisceau laser d'enregistrement/reproduction d'informations optiques comprenant un materiau d'enregistrement holographique, et procede d'enregistrement/reproduction associe - Google Patents

Appareil interferentiel a faisceau laser d'enregistrement/reproduction d'informations optiques comprenant un materiau d'enregistrement holographique, et procede d'enregistrement/reproduction associe Download PDF

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Publication number
WO2000077779A1
WO2000077779A1 PCT/JP1999/003181 JP9903181W WO0077779A1 WO 2000077779 A1 WO2000077779 A1 WO 2000077779A1 JP 9903181 W JP9903181 W JP 9903181W WO 0077779 A1 WO0077779 A1 WO 0077779A1
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WO
WIPO (PCT)
Prior art keywords
light
information
information recording
recording
recording layer
Prior art date
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/JP1999/003181
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English (en)
Japanese (ja)
Inventor
Yasuo Kamatani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LaserDynamics Inc
Original Assignee
LaserDynamics Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by LaserDynamics Inc filed Critical LaserDynamics Inc
Priority to PCT/JP1999/003181 priority Critical patent/WO2000077779A1/fr
Publication of WO2000077779A1 publication Critical patent/WO2000077779A1/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

Definitions

  • the present invention relates to an optical information recording / reproducing apparatus, and more particularly, to a novel optical information recording / reproducing apparatus and a recording / reproducing method useful for increasing a storage capacity.
  • Typical optical information recording and Z-reproducing devices include CD players, CD-ROM devices, magneto-optical discs, and DVD players.
  • a method of increasing the recording capacity by increasing the number of information recording layers in an optical disc is adopted. It was necessary to improve the signal-to-noise ratio (S / N ratio). That is, in the prior art, the recording density is limited by unnecessary light from an adjacent layer in the case of multilayering. In order to increase the recording capacity of each recording layer, a method of increasing the recording density has been adopted. However, the signal-to-noise ratio (SZN ratio) due to the unnecessary reflection light from the adjacent layer is further increased. The problem of worsening occurs.
  • An information recording / reproducing apparatus using a holographic material can superimpose an information beam having recording information and a reference beam having no recording information inside the holographic material.
  • Information recording is performed by writing an interference fringe called an interference pattern caused by the above in the holographic material.
  • the recorded information is reproduced by the diffraction of the interference pattern.
  • the major advantage of information recording / reproducing by the diffraction of the interference pattern is that the influence of unnecessary reflected light from adjacent information recording patterns or adjacent information recording patterns or information recording pits in the same information recording layer is reduced.
  • the point is that the information recording density of each layer can be improved and the information recording layer can be further multilayered.
  • Fig. 6 shows the configuration of a conventional general holographic information recording and Z-reproducing apparatus.
  • a laser beam 40 from a light source (not shown) generates information light by a spatial light modulator 41 that controls transmission Z light shielding for each pixel.
  • the spatial modulator 41 two-dimensionally modulates the information based on the information to be recorded, converts the modulated information into a two-dimensional pattern called page data, and controls the pixels on the spatial modulator 41 by transmitting and shielding light. It has the function of generating light.
  • the information light controlled by the spatial light modulator 41 is modulated into flat light by the cylindrical lens 42 and irradiated onto the hologram recording medium 43.
  • the information beam and the reference beam interfere with each other by simultaneously irradiating the laser beam 44 from another light source (not shown) as the reference beam, and are recorded as interference fringes in the hologram recording medium 43.
  • multiplex recording can be performed by changing the incident angle of the reference light.
  • the reproduced light is generated by being selectively diffracted by the recorded interference fringes.
  • This reproduced light is detected by a CCD (Charge Coupled Device) array 46 via a lens 45, and the information is reproduced by modulating (demodulating) the two-dimensional modulation in reverse to the information recording.
  • the holographic information recording Z reproducing apparatus shown in FIG. 6 two light sources, a light source for generating information light and a light source for generating reference light, are indispensable.
  • the feature is that interference fringes are recorded by causing two lights to interfere with each other.
  • the size of the device increases and the components of the conventional optical information recording / reproducing device cannot be used.
  • the device is compatible with existing media such as CDs and DVDs, which are conventional optical information recording / reproducing media. Is difficult to provide.
  • the holographic information recording / reproducing apparatus is characterized by recording two-dimensional information, and it is indispensable to use a spatial light modulator 41 for generating information light as a component. is there.
  • the circuit for driving the spatial light modulator 41 becomes complicated, and the recording speed is limited by the control speed of the spatial light modulator 41 when recording information. Further, at the time of reproduction, it is necessary to detect two-dimensional information by the CCD array 46, and there is a disadvantage that the demodulation circuit becomes complicated in the demodulation processing of the detected information.
  • a first object of the present invention is to provide a novel optical information recording / reproducing apparatus with a simple configuration that enables recording of optical information by generating interference fringes even with only a single light source. is there.
  • a second object of the present invention is to apply a novel holographic information recording Z-reproducing apparatus and method which does not use a spatial modulator, and to improve information recording Z-reproducing speed.
  • the object is to provide a Z playback device.
  • a third object of the present invention is to provide a large-capacity optical information recording Z-reproducing device having compatibility with existing optical information recording media such as CDs and DVDs, to a new holo-ray information recording Z-reproducing device and method. It is to provide.
  • a fourth object of the present invention is to reduce the size of the apparatus by a novel holographic information recording Z-reproducing apparatus and method with a simple configuration, and to make possible the components used in the conventional optical information recording / reproducing apparatus. It is an object of the present invention to provide an inexpensive optical information recording / reproducing apparatus by diverting the information.
  • the optical information recording device of the present invention includes an information recording layer containing a holographic material, and a light reflection layer provided on one side of the information recording layer so as to face the information recording layer.
  • An optical information recording apparatus for recording information on an optical information recording medium comprising: a light source for emitting coherent light; and a light source for pulse-driving the light source in accordance with an information signal to be recorded to produce recording information light.
  • a control unit irradiating the information recording layer with the recording information light from the other surface side, and reflecting at least a part of the illuminated recording information light by the light reflecting layer;
  • the information recording layer is irradiated as light from the one surface side, and the recording information light and the recording reference light interfere with each other on the information recording layer to generate interference fringes.
  • An optical system for recording on the information recording layer comprising: a light source for emitting coherent light; and a light source for pulse-driving the light source in accordance with an information signal to be recorded to produce recording information light.
  • a collimating lens that converts the recording information light emitted from the light source into parallel light
  • a beam splitter that diffracts the light emitted from the collimating lens, and an emitted light from the beam splitter
  • a focus lens for condensing the recording information light and focusing on the information recording layer; an actuator for driving the focus lens;
  • a laser diode can be used as the light source.
  • information is read from an optical information recording medium including an information recording layer containing a holographic material and a light reflection layer provided on one side of the information recording layer so as to face the information recording layer.
  • a light source that emits coherent light
  • light source control means that drives the light source to create reproduction reference light
  • the reproduction reference light is set to have an intensity that does not affect the interference fringes recorded on the information recording layer.
  • the optical system converts the reproduction reference light emitted from the light source into parallel light.
  • a collimating lens that exchanges light; a beam splitter that diffracts light emitted from the collimating lens; and a condenser that condenses the reproduction reference light emitted from the beam splitter.
  • a first lens that focuses on the first lens, an actuator that drives the first lens, and a reflected light diffracted and extracted from the information recording layer via the first lens and the beam splitter.
  • a second lens that enters and guides the light onto the photodetector;
  • the information recording layer containing a holographic material is opposed to one side of the information recording layer.
  • Optical information recording / reproducing apparatus for recording / reproducing information on / from an optical information recording medium having a light reflecting layer provided as a light source, a light source for emitting coherent light, and a recording for recording.
  • a light source control means for pulse-driving the light source in accordance with the information signal to generate a recording information light, and driving the light source to generate a reproduction reference light at the time of reproduction; and for the information recording layer at the time of recording.
  • Irradiation on information recording layer Causing the recording information light and the recording reference light to interfere with each other on the information recording layer to generate interference fringes; recording the interference fringes on the information recording layer;
  • the optical system irradiates the reproduction reference light from the other surface side to extract reflected light diffracted by interference fringes recorded on the information recording layer, and the optical system extracted through the optical system.
  • a light detector that receives the reflected light and detects an electric signal based on the information recorded on the information recording layer.
  • a collimating lens for converting the recording information light or the reproduction reference light emitted from the light source into a parallel light; a beam splitter for diffracting the light emitted from the collimating lens; and the beam splitter.
  • the recording information emitted from the A first lens that condenses the information light or the reference light for reproduction and focuses on the information recording layer; an actuator that drives the first lens; and diffracted light from the information recording layer.
  • a second lens that receives the reflected light via the first lens and the beam splitter and guides the reflected light onto the photodetector.
  • the reproduction reference light is set to have an intensity that does not affect the interference fringes recorded on the information recording layer.
  • a laser diode can be used as the light source.
  • an optical information recording medium including a holographic material-containing information recording layer and a light reflection layer provided on one side of the information recording layer facing the information recording layer.
  • a light source for emitting coherent light is pulse-driven in accordance with an information signal to be recorded to create a recording information light
  • the other side of the information recording layer is Irradiating the recording information light from a surface side, and reflecting at least a part of the illuminated recording information light by the light reflection layer; and as the recording reference light, from the one surface side to the information recording layer.
  • an optical information recording medium including a holographic material and a light reflecting layer provided on one side of the information recording layer so as to face information from an optical information recording medium.
  • a light source for emitting coherent light is driven to create a reproducing reference light, and the information recording layer is irradiated with the reproducing reference light from the other surface side, Information is obtained by extracting reflected light diffracted by the interference fringes recorded on the information recording layer, receiving the extracted reflected light, and detecting an electric signal based on the information recorded on the information recording layer. Perform playback.
  • the reproduction reference light is set to have an intensity t that does not affect interference fringes recorded on the information recording layer.
  • an optical information recording apparatus comprising: an information recording layer containing a holographic material; and a light reflection layer provided on one side of the information recording layer so as to face the information recording layer.
  • a recording light beam is created by pulse driving a light source which emits coherent light according to an information signal to be recorded during recording. At the time of reproduction, the light source is driven to create a reproduction reference light.
  • the information recording layer is irradiated with the recording information light from the other surface side, and the irradiated recording information light is irradiated. At least a part of the light is reflected by the light reflection layer, and the information recording layer is irradiated from the one surface side as recording reference light, and the recording information light and the recording reference light are irradiated on the information recording layer. Generate interference fringes by interfering with light The interference fringes are recorded on the information recording layer, and at the time of reproduction, the information recording layer is irradiated with the reproduction reference light from the other surface side, and the interference recorded on the information recording layer is reproduced.
  • the reflected light diffracted by the stripes is taken out, the reflected light taken out is received, and an electric signal based on the information recorded on the information recording layer is detected to reproduce the information.
  • the reference light is set to have an intensity that does not affect the interference fringes recorded on the information recording layer.
  • FIG. 1 shows a diagram for explaining the principle of optical information recording and Z reproduction according to the present invention.
  • FIG. 2 shows an embodiment of the optical information recording and Z reproducing apparatus according to the present invention at the time of information recording.
  • FIG. 3 shows an embodiment of the optical information recording / reproducing apparatus according to the present invention when reproducing information.
  • FIG. 4 is a diagram for explaining the effect of interference fringes during information recording Z reproduction of the optical information recording Z reproduction apparatus according to the present invention.
  • FIG. 5 is a block diagram showing a configuration of an optical information recording / reproducing apparatus according to the present invention.
  • FIG. 6 shows a configuration diagram of a conventional holographic information recording / reproducing apparatus.
  • FIG. 1 is a diagram illustrating the principle of the present invention.
  • a holographic disc 01 is used as an optical information recording medium.
  • Holographic Kkudisuku 0 1 includes a transparent substrate layer 0 2, L i N b 0 holography containing holographic click material 3 such as ram layer 0 3, a reflective film layer 0 4 and the protective layer 0 5 to total reflection of the light beam laminate Structure.
  • a light beam emitted from a laser diode 06 that emits coherent light is collimated by a lens 08 and is diffracted by a beam splitter 09. Further, the light is converged by the focus lens 10 and focused on the hologram layer 03 in the holographic disc 01.
  • interference fringes when interference fringes are present, reflected light is generated by diffraction due to the interference fringes, and the reflected light is condensed by a lens 12 through a focus lens 10 and a beam splitter 09, and a photodetector 13 Received.
  • the recorded information is reproduced based on the received optical signal.
  • the presence or absence of interference fringes is reflected in the intensity of the reflected light received by the photodetector 13, and the recorded information is reproduced.
  • FIG. 2 shows an embodiment of the optical information recording / reproducing apparatus to which the present invention is applied when recording information.
  • the laser diode 06 that emits coherent light is connected to the light source drive circuit 07 Therefore, it is driven according to the digital information signal to be recorded, and oscillates pulsed light.
  • the laser diode 06 emits coherent light when the digital information signal is “1”, and performs pulse control that does not emit light when the digital information signal is “0”. .
  • the light beam emitted from the laser diode 06 at the digital information signal “1” is collimated by the lens 08 and diffracted by the beam splitter 09. Further, the light is converged by the focus lens 10 and focused on the hologram layer 03 in the holographic disc 01.
  • the actuator 11 drives the focus lens 10 to move the focus in the thickness direction of the holographic disc 01 and adjusts the focus position based on a focus error signal.
  • the focus lens 10 is driven by the actuator 11 and the position of the holographic layer 03 and the thickness of the holographic disk 01 are detected by detecting the reflected light, and the other optical information recording medium is detected. Can also be identified.
  • the light beam condensed on the hologram layer 03 by the focus lens 10 interferes with the light beam transmitted through the hologram layer 03 and reflected by the reflection film layer 04, and recorded as interference fringes on the hologram layer 03. It becomes the recording state 03 a in which the digital information signal “1” as information is recorded.
  • the digital information signal “0” since the laser diode 06 does not emit light, naturally no interference fringes occur and the recording state is 0 3 b where there is no interference fringe, and this is the digital information signal “0”. Recording state.
  • FIG. 3 shows an embodiment of the optical information recording / reproducing apparatus to which the present invention is applied when reproducing information.
  • the laser diode 06 is driven by the light source driving circuit 07 to emit a weak light beam that does not affect the interference fringes recorded on the hologram layer 03.
  • the light is focused on the aperture gram layer 03 via the lens 08, the beam splitter 09, and the focus lens 10.
  • the recording state 03 a where interference fringes exist, strong reflected light is generated due to diffraction by the interference fringes.
  • recording state 0 3 b where no interference fringes exist, Does not generate reflected light.
  • the reflected light diffracted by the interference fringes is
  • the light is condensed by the lens 12 through the cas lens 10 and the beam splitter 09 and is received by the photodetector 13. Force for reproducing recorded information based on received optical signals The presence or absence of interference fringes is reflected in the intensity of reflected light received by photodetector 13, and reproduction of recorded information is realized.
  • FIG. 4 is a diagram for explaining the effect of interference fringes during information recording / reproduction of the optical information recording / reproducing apparatus to which the present invention is applied.
  • a light beam emitted from a laser diode (not shown) is driven by an actuator 11 so that the focus lens 10 focuses on the center of the hologram layer 03.
  • the light beam condensed by the focus lens 10 and the light beam transmitted through the hologram layer 03 and reflected by the reflection film layer 04 interfere with each other, and are recorded as interference fringes on the hologram layer 03 and the recording state 03a.
  • Become When a light beam having a light intensity that does not affect the interference fringes is applied during reproduction, strong reflected light diffracted by the interference fringes is detected.
  • the luminous flux reflected by the reflection film layer 04 also becomes return light, but has a light intensity sufficient to cause interference on the hologram layer 03 which is a nearby area, but the diffraction limited light spot which becomes a focal point Is already transmitted and becomes scattered light, which is unlikely to cause noise.
  • FIG. 5 shows a block diagram for explaining the configuration of the optical information recording / reproducing apparatus to which the present invention is applied.
  • the holographic disk 01 in the present invention is fixed by a spindle 20 and is rotationally driven by a spindle motor 21.
  • the spindle motor 21 is controlled by a spindle servo circuit 22 that controls the number of revolutions according to the information recording and reproducing speed.
  • the big-up 23 has a configuration that includes the optical system shown in FIGS. 1, 2 and 3 in the present invention.
  • the big finger 23 is moved by the big end drive 24 in the radial direction of the holographic disk 01, and the holographic It is possible to move the focal point of the light beam to each information recording area on the disk 01.
  • the signal due to the reflected light received by the photodetector in the pickup 23 detects the focus error signal by the detection circuit 25, and the signal in the pickup is detected by the focus servo circuit 26 and the tracking servo circuit 27.
  • the force lens is driven by the actuator to correct the focal position and identify the optical information recording medium.
  • the pickup servo circuit 28 controls the pickup drive device 24 and controls the radial movement of the holographic disc 01.
  • the spindle servo circuit 22, focus servo circuit 26, talking servo circuit 27 and pickup servo circuit 28 are controlled by a servo controller 29 in response to a signal from the detection circuit 25. Integrally controlled.
  • the signal processing circuit 31 processes the read signal detected by the detection circuit 25 as a reproduction signal.
  • the system controller 30 is a central processing unit that controls the entire optical information recording and Z playback device.
  • the present invention enables recording of optical information by generating interference fringes with only a single light source with a simple configuration. Further, it is possible to increase the information recording / reproducing speed without using a spatial modulator which is indispensable for the conventional holographic recording / reproducing apparatus. In addition, it is compatible with existing optical information recording media, which has the same structure as that of the existing optical information recording / reproducing apparatus. An optical information recording / reproducing apparatus having a large capacity can be provided by a novel holographic information recording / reproducing apparatus and method.

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  • Optical Recording Or Reproduction (AREA)

Abstract

L'invention concerne un appareil d'enregistrement/reproduction d'informations optiques permettant d'enregistrer des informations sur un support d'enregistrement comprenant une couche d'enregistrement de données constituée d'un matériau holographique et une couche constituée d'un film réfléchissant destinée à réfléchir la lumière incidente. Ledit appareil comprend une source lumineuse émettant le faisceau lumineux projeté sur le support d'informations optiques, et un système optique destiné à focaliser le faisceau lumineux sur le support d'enregistrement d'informations optiques, les franges d'interférence formées par l'interférence du faisceau lumineux focalisé et de la lumière traversant la couche d'enregistrement d'informations et réfléchie par la couche du film réfléchissant étant enregistrées sur la couche d'enregistrement d'informations. On projette alors sur lesdites franges d'interférence un faisceau lumineux d'une intensité suffisamment faible pour ne pas avoir d'influence sur les franges d'interférence et l'on détecte la lumière diffractée par les franges d'interférence, ce qui permet de reproduire la structure enregistrée.
PCT/JP1999/003181 1999-06-15 1999-06-15 Appareil interferentiel a faisceau laser d'enregistrement/reproduction d'informations optiques comprenant un materiau d'enregistrement holographique, et procede d'enregistrement/reproduction associe Ceased WO2000077779A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP1999/003181 WO2000077779A1 (fr) 1999-06-15 1999-06-15 Appareil interferentiel a faisceau laser d'enregistrement/reproduction d'informations optiques comprenant un materiau d'enregistrement holographique, et procede d'enregistrement/reproduction associe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1999/003181 WO2000077779A1 (fr) 1999-06-15 1999-06-15 Appareil interferentiel a faisceau laser d'enregistrement/reproduction d'informations optiques comprenant un materiau d'enregistrement holographique, et procede d'enregistrement/reproduction associe

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WO2000077779A1 true WO2000077779A1 (fr) 2000-12-21

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03120625A (ja) * 1989-10-04 1991-05-22 Canon Inc 情報記録再生装置
JPH03216824A (ja) * 1990-01-22 1991-09-24 Hitachi Ltd 光情報記録媒体及び光情報記録方法
JPH05232850A (ja) * 1992-02-20 1993-09-10 Toppan Printing Co Ltd ホログラム用感材およびその処理方法
JPH0737028A (ja) * 1993-07-15 1995-02-07 Nippondenso Co Ltd 情報記録装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03120625A (ja) * 1989-10-04 1991-05-22 Canon Inc 情報記録再生装置
JPH03216824A (ja) * 1990-01-22 1991-09-24 Hitachi Ltd 光情報記録媒体及び光情報記録方法
JPH05232850A (ja) * 1992-02-20 1993-09-10 Toppan Printing Co Ltd ホログラム用感材およびその処理方法
JPH0737028A (ja) * 1993-07-15 1995-02-07 Nippondenso Co Ltd 情報記録装置

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