WO2000077779A1 - Laser beam interference optical information recording/reproducing apparatus comprising holographic recording material and optical information recording/reproducing method - Google Patents
Laser beam interference optical information recording/reproducing apparatus comprising holographic recording material and optical information recording/reproducing method Download PDFInfo
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- 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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- 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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Abstract
Description
明 細 書 ホログラフィ ック記録素材を使つたレーザ一光干渉型 光情報記録 Z再生装置及び光情報記録 Z再生方法 技 術 分 野 Description Laser-one-beam interference type optical information recording Z-reproducing device and optical information recording Z-reproducing method using holographic recording material
本発明は、 光情報記録/再生装置に係り、 特に、 記憶容量を増大させるの に有用な、 新規の光情報記録 Z再生装置及びその記録再生方法に関する。 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.
背 景 技 術 Background technology
通信手段及びコンピュータによる情報処理量の増加にともない、 各種の光 情報記録 Z再生装置が考案、 実用化されてきた。 代表的な光情報記録 Z再生 装置として、 C Dプレーヤや C D— R O M装置、 光磁気ディスク、 D V D With the increase in the amount of information processing by communication means and computers, various types of optical information recording / reproducing apparatuses have been devised and put into practical use. Typical optical information recording and Z-reproducing devices include CD players, CD-ROM devices, magneto-optical discs, and DVD players.
(デジ夕ルビデオデイスク） 等があげられるが、 通信情報量やコンピュータ 情報処理量の増加にともない、 さらなる大容量の情報記録 Z再生装置が必要 であると予測される。 (Digital Video Disk), etc., but with the increase in the amount of communication information and computer information processing, it is expected that an even larger-capacity information recording and Z-reproducing device will be required.
従来の光情報記録装置の一部には、 光ディスク内の情報記録層を多層化し 記録容量を増大させる手法が取り入れられているが、 多層化した際の隣接す る層からの不要反射光による、 信号対雑音比 （S / Nレシオ） の改善を図る 必要があった。 つまり、 従来技術においては、 多層化した場合の隣接層から の不要光によって、 記録密度に限界が生じている。 さらに、 各記録層におけ る記録容量を増大させるために記録密度を向上させる手法も取り入れられて いるが、 前述の隣接する層からの不要反射光による、 信号対雑音比 （S Z N レシオ） はさらに悪化するという問題が発生する。 In some conventional optical information recording devices, 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.
近年では、 研究開発段階にあるホログラフィ ックメモリあるいはホログラ フィ ック素材を用いた各種情報記録 Z再生装置が提案されている。 ホログラ フィ ック素材を用いた情報記録ズ再生装置は、 記録情報を有する情報光と記 録情報を持たない参照光とをホログラフィ ック素材の内部で重ね合わせるこ とによって生じる干渉パターンと呼ばれる干渉縞をホログラフィ ック素材の 内部に書き込むことによって情報記録を行う。 情報再生の際には、 干渉バタ ―ンが記録されたホロダラフィ ック素材の内部に参照光のみを照射すると、 干渉パターンの回折によつて記録情報が再生される。 干渉パターンの回折に よる情報記録再生の大きな利点は、 前述の、 隣接する層や同一情報記録層内 での隣接する情報記録バターンあるいは情報記録ピッ トからの不要反射光に よる影響が低減され、 各層における情報記録密度の向上及び情報記録層のさ らなる多層化に対応できる点にある。 In recent years, various information recording and Z-reproducing devices using holographic memory or holographic materials in the research and development stage have been proposed. 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. At the time of information reproduction, when only the reference light is irradiated inside the holodastic material on which the interference pattern is recorded, 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.
図 6に従来の一般的なホログラフィ ック情報記録 Z再生装置の構成図を示 す。 図示しない光源からのレーザ一光 4 0は、 画素毎に透過 Z遮光を制御す る空間光変調器 4 1によって情報光を発生させる。 空間変調器 4 1は、 記録 する情報に基づきこれを 2次元変調し、 ページデータと呼ばれる 2次元パ夕 ーンに変換し、 空間変調器 4 1上の画素を透過 Z遮光制御することにより情 報光を発生させる機能を有する。 空間光変調器 4 1によって制御された情報 光は、 シリンドリカルレンズ 4 2によって扁平光に変調されてホログラム記 録媒体 4 3上に照射される。 この時、 同時に図示しない他の光源からのレー ザ一光 4 4を参照光として照射することによつて情報光と参照光とが干渉し、 ホログラム記録媒体 4 3内に干渉縞として記録される。 また、 参照光がホロ グラム記録媒体 4 3上で情報光と干渉する際に、 参照光の入射角度を変える ことによって多重記録が可能となる。 再生の際には、 ホログラム記録媒体 4 3上で情報を記録した場所に記録した時と同じ角度で参照光のみを照射する と、 記録された干渉縞によって選択的に回折され再生光が発生する。 この再 生光は、 レンズ 4 5を介して C C D (電荷結合素子） アレイ 4 6によって検 出され、 情報記録の際の 2次元変調とは逆に変調 （復調） することにより情 報が再生される。 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. At this time, 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. . Further, when the reference light interferes with the information light on the hologram recording medium 43, multiplex recording can be performed by changing the incident angle of the reference light. At the time of reproduction, if only the reference light is irradiated at the same angle as when recording at the place where information was recorded on the hologram recording medium 43, 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. You.
図 6に示したホログラフィ ック情報記録 Z再生装置においては、 情報光を 発生させるための光源と参照光を発生させる光源との 2つの光源が不可欠で あり、 2つの光を干渉させることによって干渉縞を記録することが特徴であ る。 このため、 装置が大型化し従来の光情報記録/再生装置の構成部品が使 えず、 さらに、 従来の光情報記録 Z再生媒体である C Dや D V Dといった既 存のメディアとの互換性を有する装置を提供することが困難である。 また、 このホログラフィ ック情報記録/再生装置においては、 2次元情報を記録す ることが大きな特徴であり、 情報光を発生させるための空間光変調器 4 1を 構成要素として用いることが不可欠である。 このため、 空間光変調器 4 1を 駆動するための回路が複雑なものとなるうえ、 情報記録の際には空間光変調 器 4 1の制御速度によって記録速度が制限される欠点がある。 さらに再生の 際には、 C C Dアレイ 4 6による 2次元情報の検出が必要であり、 検出され た情報の復調処理においても復調回路が複雑になる欠点がある。 In 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. As a result, the size of the device increases and the components of the conventional optical information recording / reproducing device cannot be used.In addition, 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. For this reason, 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.
上記問題に鑑み、 本発明の第 1の目的は、 単一光源のみでも干渉縞を発生 させて光情報の記録を可能にし、 簡易な構成による新規の光情報記録 Z再生 装置を提供することである。 In view of the above problems, 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.
本発明の第 2の目的は、 空間変調器を用いない新規のホログラフィ ック情 報記録 Z再生装置及び方法を適用し、 情報記録 Z再生速度を向上させること が可能な、 新規の光情報記録 Z再生装置を提供することである。 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.
本発明の第 3の目的は、 C Dや D V Dといつた既存の光情報記録媒体との 互換性を有する大容量の光情報記録 Z再生装置を新規のホロダラフイ ツク情 報記録 Z再生装置及び方法によつて提供することである。 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.
本発明の第 4の目的は、 簡易な構成による新規のホログラフィ ック情報記 録 Z再生装置及び方法によって装置を小型化し、 さらに従来の光情報記録 再生装置に用いられている構成部品を可能なかぎり流用することによって安 価な光情報記録/再生装置を提供することである。 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.
発 明 の 開 示 Disclosure of the invention
本発明の光情報記録装置では、 ホログラフィ ック素材を含有する情報記録 層と、 この情報記録層の一方の面側に対向して設けられた光反射層とを備え た光情報記録媒体に対して情報を記録する光情報記録装置において、 コヒー レント光を出射する光源と、 記録すべき情報信号に応じて前記光源をパルス 駆動して記録用情報光を作成する光源制御手段と、 前記情報記録層に対して、 他方の面側から前記記録用情報光を照射し、 照射された前記記録用情報光の 少なくとも一部を前記光反射層により反射させ、 記録用参照光として前記一 方の面側から前記情報記録層に照射し、 前記情報記録層上で前記記録用情報 光と前記記録用参照光とを干渉させて干渉縞を発生させ、 この干渉縞を前記 情報記録層に記録させる光学系と、 を備える。 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.
前記光学系として、 前記光源から出射する前記記録用情報光を平行光に変 換するコリメ一トレンズと、 前記コリメートレンズからの出射光を回折させ るビームスプリッタと、 前記ビ一ムスプリッ夕から出射する前記記録用情報 光を集光し前記情報記録層上に焦点合せするフオーカスレンズと、 前記フォ —カスレンズを駆動するァクチユエ一夕と、 As the optical system, 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;
を含むように構成することが出来る。 May be included.
また、 前記光源としてレーザ一ダイオードを用いることが出来る。 Further, a laser diode can be used as the light source.
本発明の光情報再生装置では、 ホログラフィ ック素材を含有する情報記録 層と、 この情報記録層の一方の面側に対向して設けられた光反射層とを備え た光情報記録媒体から情報を読み出す光情報再生装置において、 コヒーレン 卜光を出射する光源と、 前記光源を駆動して再生用参照光を作成する光源制 御手段と、 According to the optical information reproducing apparatus of the present invention, 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;
前記情報記録層に対して、 他方の面側から前記再生用参照光を照射し、 前 記情報記録層に記録された干渉縞によって回折した反射光を取出す光学系と、 前記光学系を介して取出された前記反射光を受光し、 前記情報記録層に記録 された情報に基づく電気信号を検出する光検出器と、 を備える。 An optical system for irradiating the information recording layer with the reproduction reference light from the other surface side and extracting reflected light diffracted by interference fringes recorded on the information recording layer; and A light detector that receives the extracted reflected light and detects an electric signal based on information recorded in the information recording layer.
ここで、 前記再生用参照光は、 前記情報記録層に記録された干渉縞に影響 を与えない強度を有するよう設定される。 Here, the reproduction reference light is set to have an intensity that does not affect the interference fringes recorded on the information recording layer.
前記光学系として、 前記光源から出射する前記再生用参照光を平行光に変 換するコリメ一卜レンズと、 前記コリメ一卜レンズからの出射光を回折させ るビ一ムスプリッタと、 前記ビ一ムスプリッ夕から出射する前記再生用参照 光を集光し、 前記情報記録層上に焦点合せする第 1のレンズと、 前記第 1の レンズを駆動するァクチユエ一夕と、 前記情報記録層から回折して取出され た反射光を前記第 1のレンズと前記ビームスプリッタとを介して入射し、 前 記光検出器上に導びく第 2のレンズと、 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;
を含むように構成することが出来る。 May be included.
また、 前記光源としてレーザ一ダイォ一ドを用い δことが出来る本発明の 光情報記録 ·再生装置では、 ホログラフィ ック素材を含有する情報記録層と、 この情報記録層の一方の面側に対向して設けられた光反射層とを備えた光情 報記録媒体に対して情報を記録 ·再生する光情報記録 ·再生装置において、 コヒ一レン卜光を出射する光源と、 記録時には記録すべき情報信号に応じて 前記光源をパルス駆動して記録用情報光を作成し、 再生時には前記光源を駆 動して再生用参照光を作成する光源制御手段と、 記録時には、 前記情報記録 層に対して、 他方の面側から前記記録用情報光を照射し照射された前記記録 用情報光の少なくとも一部を前記光反射層により反射させ、 記録用参照光と して前記一方の面側から前記情報記録層に照射し、 前記情報記録層上で前記 記録用情報光と前記記録用参照光とを干渉させて干渉縞を発生させ、 この干 渉縞を前記情報記録層に記録し、 再生時には、 前記情報記録層に対して、 前 記他方の面側から前記再生用参照光を照射し、 前記情報記録層に記録された 干渉縞によって回折した反射光を取出す光学系と、 前記光学系を介して取出 された前記反射光を受光し、 前記情報記録層に記録された情報に基づく電気 信号を検出する光検出器と、 を備える。 Further, in the optical information recording / reproducing apparatus of the present invention, which can use a laser diode as the light source, 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. Irradiating 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, and forming the recording information light from the one surface side as the recording reference light. 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; On the other hand, 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.
前記光学系として、 As the optical system,
前記光源から出射する前記記録用情報光又は前記再生用参照光を平行光に 変換するコリメ一トレンズと、 前記コリメ一トレンズからの出射光を回折さ せるビームスプリ ッ夕と、 前記ビ一厶スプリ ッ夕から出射する前記記録用情 報光又は前記再生用参照光を集光し、 前記情報記録層上に焦点合せする第 1 のレンズと、 前記第 1のレンズを駆動するァクチユエ一夕と、 前記情報記録 層から回折して取出された反射光を前記第 1のレンズと前記ビームスプリッ 夕とを介して入射し、 前記光検出器上に導びく第 2のレンズと、 を含むよう に構成することが出来る。 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. And a second lens that receives the reflected light via the first lens and the beam splitter and guides the reflected light onto the photodetector.
ここで、 前記再生用参照光は、 前記情報記録層に記録された干渉縞に影響 を与えない強度を有するよう設定される。 Here, the reproduction reference light is set to have an intensity that does not affect the interference fringes recorded on the information recording layer.
また、 前記光源としてレーザ一ダイォードを用いることが出来る。 Further, a laser diode can be used as the light source.
本発明の光情報記録方法では、 ホログラフィ ック素材を含有する情報記録 層と、 この情報記録層の一方の面側に対向して設けられた光反射層とを備え た光情報記録媒体に対して情報を記録する光情報記録方法において、 記録す べき情報信号に応じてコヒ一レント光を出射する光源をパルス駆動して記録 用情報光を作成し、 前記情報記録層に対して、 他方の面側から前記記録用情 報光を照射し、 照射された前記記録用情報光の少なくとも一部を前記光反射 層により反射させ、 記録用参照光として前記一方の面側から前記情報記録層 に照射し、 前記情報記録層上で前記記録用情報光と前記記録用参照光とを干 渉させて干渉縞を発生させ、 この干渉縞を前記情報記録層に記録させる。 本発明の光情報再生方法では、 ホログラフィ ック素材を含有する情報記録 層と、 この情報記録層の一方の面側に対向して設けられた光反射層とを備え た光情報記録媒体から情報を読み出す光情報再生方法において、 コヒーレン 卜光を出射する光源を駆動して再生用参照光を作成し、 前記情報記録層に対 して、 他方の面側から前記再生用参照光を照射し、 前記情報記録層に記録さ れた干渉縞によって回折した反射光を取出し、 取出された前記反射光を受光 し、 前記情報記録層に記録された情報に基づく電気信号を検出することによ り情報の再生を行う。 In the optical information recording method of the present invention, 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 is provided. In the optical information recording method of recording information by recording, 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, and 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. Irradiation causes interference between the recording information light and the recording reference light on the information recording layer to generate interference fringes, and the interference fringes are recorded on the information recording layer. According to the optical information reproducing method of the present invention, 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. In the optical information reproducing method for reading out the information, 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.
ここで、 前記再生用参照光は、 前記情報記録層に記録された干渉縞に影響 を与えな t、強度を有するよう設定される。 本発明の光情報記録 ·再生方法では、 ホログラフィ ック素材を含有する情 報記録層と、 この情報記録層の一方の面側に対向して設けられた光反射層と を備えた光情報記録媒体に対して情報を記録 ·再生する光情報記録 ·再生方 法において、 記録時には記録すべき情報信号に応じてコヒ一レント光を出射 する光源をパルス駆動して記録用情報光を作成し、 再生時には前記光源を駆 動して再生用参照光を作成し、 記録時には、 前記情報記録層に対して、 他方 の面側から前記記録用情報光を照射し、 照射された前記記録用情報光の少な くとも一部を前記光反射層により反射させ、 記録用参照光として前記一方の 面側から前記情報記録層に照射し、 前記情報記録層上で前記記録用情報光と 前記記録用参照光とを干渉させて干渉縞を発生させ、 この干渉縞を前記情報 記録層に記録し、 再生時には、 前記情報記録層に対して、 前記他方の面側か ら前記再生用参照光を照射し、 前記情報記録層に記録された干渉縞によつて 回折した反射光を取出し、 取出された前記反射光を受光し、 前記情報記録層 に記録された情報に基づく電気信号を検出することにより情報の再生を行う ここで、 前記再生用参照光は、 前記情報記録層に記録された干渉縞に影響 を与えない強度を有するよう設定される。 Here, the reproduction reference light is set to have an intensity t that does not affect interference fringes recorded on the information recording layer. According to the optical information recording / reproducing method of the present invention, there is provided 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. In an optical information recording / reproducing method for recording / reproducing information on a medium, 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. At the time of recording, 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.
図面の簡単な説明 BRIEF DESCRIPTION OF THE FIGURES
図 1は、 本発明による光情報記録 Z再生の原理を説明するための図を示す 図 2は、 本発明による光情報記録 Z再生装置の情報記録時の実施の形態を 示す。 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.
図 3は、 本発明による光情報記録 Z再生装置の情報再生時の実施の形態を 示す。 FIG. 3 shows an embodiment of the optical information recording / reproducing apparatus according to the present invention when reproducing information.
図 4は、 本発明による光情報記録 Z再生装置の情報記録 Z再生時の干渉縞 の作用を説明するための図を示す。 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.
図 5は、 本発明による光情報記録/再生装置の構成ブロック図を示す。 図 6は、 従来のホログラフィ ック情報記録 Z再生装置の構成図を示す。 発明を実施するための最良の形態 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. BEST MODE FOR CARRYING OUT THE INVENTION
図 1に本発明の原理を説明するための図を示す。 光情報記録媒体としてホ ログラフィ ックディスク 0 1を用いる。 ホログラフィ ックディスク 0 1は、 透明基板層 0 2、 L i N b 0 3 等のホログラフィ ック素材を含有するホログ ラム層 0 3、 光束を全反射する反射膜層 0 4及び保護層 0 5を積層した構造 とする。 コヒーレント光を出射するレーザーダイォ一ド 0 6より出射した光 束は、 レンズ 0 8によってコリメ一卜されビ一ムスプリッタ 0 9によって回 折される。 さらに、 フォーカスレンズ 1 0によって集光されホログラフイ ツ クディスク 0 1内のホログラム層 0 3上に焦点を合わせられる。 ァクチユエ —夕 1 1は、 フォーカスレンズ 1 0を駆動し、 焦点をホログラフィ ックディ スク 0 1の厚み方向に移動させたり、 フォーカスエラ一信号に基づいて焦点 位置を調整する。 フォーカスレンズ 1 0によってホログラム層 0 3上に集光 した光束は、 ホログラム層 0 3を透過し反射膜層 0 4によって反射した光束 と干渉し、 ホログラム層 0 3上に干渉縞として記録される。 次に記録された 情報を再生する際には、 レーザ一ダイオード 0 6よりホログラム層 0 3上に 記録された干渉縞に影響を与えない程度の弱い光束を出射し、 レンズ 0 8、 ビームスプリッタ 0 9及びフォーカスレンズ 1 0を経てホログラム層 0 3上 に焦点を結ぶ。 この時、 干渉縞が存在する際には干渉縞による回折によって 反射光が発生し、 この反射光はフォーカスレンズ 1 0及びビームスプリッタ 0 9を経てレンズ 1 2によって集光され、 光検出器 1 3に受光される。 受光 された光信号に基づき記録情報の再生を行うが、 干渉縞の有無が光検出器 1 3に受光される反射光の強弱に反映され、 記録情報の再生を実現する。 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. Actuate — Driving the focus lens 10 to move the focus in the thickness direction of the holographic disc 01 and adjusting the focus position based on the focus error signal. The light beam focused 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 is recorded on the hologram layer 03 as interference fringes. Next, when reproducing the recorded information, the laser diode 06 emits a weak light beam that does not affect the interference fringes recorded on the hologram layer 03, and the lens 08 and the beam splitter 0 The light is focused on the hologram layer 03 through the focus lens 9 and the focus lens 10. At this time, 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.
図 2は、 本発明を適用した光情報記録/再生装置の情報記録時の実施の形 態を示す。 ホログラフィ ックディスク 0 1は、 ポリカーボネイ ト等の透明基 板層 0 2、 L i N b 0 3 を含有するホログラム層 0 3、 光束を全反射するァ ルミ二ゥムを含有する反射膜層 0 4及び保護層 0 5を積層した構造である。 コヒ一レント光を出射するレーザーダイォー ド 0 6は、 光源駆動回路 0 7に よって記録するデジタル情報信号に従い駆動され、 パルス光を発振させる。 この実施の形態では、 デジタル情報信号の 「 1」 においてレーザ一ダイォ一 ド 0 6はコヒ一レン卜光を出射し、 デジタル情報信号 「0」 においては光を 出射しないパルス制御を行うものとする。 デジタル情報信号の 「 1」 におい てレーザーダイオード 0 6より出射した光束は、 レンズ 0 8によってコリメ —卜されビ一ムスプリ ッタ 0 9によって回折される。 さらに、 フォーカスレ ンズ 1 0によって集光されホログラフィ ックディスク 0 1内のホログラム層 0 3上に焦点を合わせられる。 ァクチユエ一タ一 1 1は、 フォーカスレンズ 1 0を駆動し、 焦点をホログラフィ ックディスク 0 1の厚み方向に移動させ たり、 フォーカスエラ一信号に基づいて焦点位置を調整する。 さらに、 ァク チユエ一ター 1 1によってフォーカスレンズ 1 0を駆動し、 反射光を検出す ることによりホログラム層 0 3の位置やホログラフィ ックディスク 0 1の厚 さを検出し、 他の光情報記録媒体との識別を行うことも可能である。 フォー カスレンズ 1 0によってホログラム層 0 3上に集光した光束は、 ホログラム 層 0 3を透過し反射膜層 0 4によって反射した光束と干渉し、 ホログラム層 0 3上に干渉縞として記録され、 元情報であるデジタル情報信号 「 1」 を記 録した記録状態 0 3 aとなる。 デジタル情報信号 「0」 においてはレーザ一 ダイオード 0 6が光を出射しない為、 当然ながら干渉縞は発生せず、 干渉縞 の存在しない記録状態 0 3 bとなり、 これがデジタル情報信号 「 0」 を記録 した記録状態となる。 FIG. 2 shows an embodiment of the optical information recording / reproducing apparatus to which the present invention is applied when recording information. Holographic Kkudisuku 0 1 polycarbonate neighbor transparent base plate layer 0 2 bets, etc., L i N b 0 3 hologram layer 0 3 containing, § lumi two © reflective film layer containing a beam 0 4 for totally reflecting the light beam And a protective layer 05. 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. In this embodiment, it is assumed that 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. Further, 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. In the case of 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.
図 3は、 本発明を適用した光情報記録 Z再生装置の情報再生時の実施の形 態を示す。 記録された情報を再生する際には、 光源駆動回路 0 7によってレ 一ザ一ダイオード 0 6を駆動し、 ホログラム層 0 3上に記録された干渉縞に 影響を与えない程度の弱い光束を出射し、 レンズ 0 8、 ビームスプリ ッタ 0 9及びフオーカスレンズ 1 0を経てホ口グラム層 0 3上に焦点を結ぶ。 この 時、 干渉縞が存在する記録状態 0 3 aにおいては干渉縞による回折によって 強い反射光が発生する。 また、 干渉縞が存在しない記録状態 0 3 bにおいて は、 当然ながら反射光は発生しない。 干渉縞によって回折した反射光はフォFIG. 3 shows an embodiment of the optical information recording / reproducing apparatus to which the present invention is applied when reproducing information. When reproducing the recorded 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. Then, the light is focused on the aperture gram layer 03 via the lens 08, the beam splitter 09, and the focus lens 10. At this time, in the recording state 03 a where interference fringes exist, strong reflected light is generated due to diffraction by the interference fringes. In recording state 0 3 b where no interference fringes exist, Does not generate reflected light. The reflected light diffracted by the interference fringes is
—カスレンズ 1 0及びビームスプリッタ 0 9を経てレンズ 1 2によって集光 され光検出器 1 3に受光される。 受光された光信号に基づき記録情報の再生 を行う力 干渉縞の有無が光検出器 1 3に受光される反射光の強弱に反映さ れ、 記録情報の再生を実現する。 — 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.
図 4は、 本発明を適用した光情報記録 Z再生装置の情報記録/再生時の干 渉縞の作用を説明するための図を示す。 レーザーダイオード （図示せず） か ら出射した光束は、 フォーカスレンズ 1 0によってホログラム層 0 3の中央 に焦点を結ぶようァクチユエ一夕一 1 1によって駆動される。 フォーカスレ ンズ 1 0によって集光された光束とホログラム層 0 3を透過し反射膜層 0 4 によって反射した光束が干渉し、 ホログラム層 0 3上に干渉縞として記録さ れ記録状態 0 3 aとなる。 再生時にこの干渉縞に影響を与えない光強度の光 束を照射すると、 干渉縞によって回折を受けた強い反射光が検出される。 レ —ザ一ダイォ一ドから情報記録時に光束の出射を受けず、 干渉縞が存在しな い記録状態 0 3 bにおいては、 当然ながら反射光は発生しない。 この時、 反 射膜層 0 4に反射した光束も戻り光となるが、 近隣域であるホログラム層 0 3上においては干渉を引き起こすに足る光強度を有するものの、 焦点となる 回折限界光スポッ 卜は既に透過しているので散乱光となりノイズの原因には なりにくい。 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. In the recording state 03b where no laser beam is emitted from the laser diode at the time of information recording and no interference fringes exist, naturally no reflected light is generated. At this time, 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.
次に図 5に本発明を適用した光情報記録 Z再生装置の構成を説明するため のブロ、ソク図を示す。 本発明におけるホログラフィ ックディ スク 0 1はスビ ン ドル 2 0によって固定され、 スピン ドルモー夕 2 1 によって回転駆動され る。 スピン ドルモータ 2 1は、 情報記録及び再生速度によって回転数を制御 するスピン ドルサーボ回路 2 2によって制御される。 Next, 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.
ビックアップ 2 3は、 本発明における図 1、 図 2及び図 3に示した光学系 を含んだ構成である。 ビック丁 ' プ 2 3は、 ビック了ッブ駆動装置 2 4によ つてホログラフィ ッ クディ スク 0 1 の半径方向に移動され、 ホログラフ ィ 'v クディスク 0 1上の各情報記録エリアに光束の焦点を移動させることが可能 である。 ピックアップ 2 3内の光検出器に受光された反射光による信号は、 検出回路 2 5によってフォーカスエラ一信号が検出され、 フォーカスサ一ボ 回路 2 6及びトラッキングサ一ボ回路 2 7によりピックアップ内のフォー力 スレンズをァクチユエ一夕によって駆動し、 焦点位置を修正したり、 光情報 記録媒体の識別等を行う。 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.
ピックァップサ一ボ回路 2 8は、 ピックァップ駆動装置 2 4を制御し、 ホ ログラフィ ックディスク 0 1の半径方向の移動を制御する。 スピンドルサ一 ボ 2 2、 フォーカスサ一ボ回路 2 6、 トツキングサ一ボ回路 2 7及びピック アップサ一ボ回路 2 8は、 サ一ボコントロ一ラ 2 9によって、 検出回路 2 5 からの信号に応じて統合的に制御される。 信号処理回路 3 1は、 検出回路 2 5によって検出された読み取り信号を再生信号として処理する。 システムコ ン卜ローラ 3 0は、 光情報記録 Z再生装置全体を制御する中央演算装置であ 産業上の利用可能性 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.
以上に述べたように本発明は、 簡易な構成によって単一光源のみでも干渉 縞を発生させて光情報の記録を可能にする。 また、 従来のホログラフィ ック 記録再生装置に不可欠であった空間変調器を用いずに情報記録再生速度を向 上させることが可能である。 さらに、 じ0ゃじ 0とぃった既存の光情報記 録媒体との互換性を有し、 従来の光情報記録再生装置に用いられている構成 部品を可能なかぎり流用した構成によって、 大容量の光情報記録再生装置を 新規のホログラフィ ック情報記録/再生装置及び方法によって提供すること が可能となる。 As described above, 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.
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP1999/003181 WO2000077779A1 (en) | 1999-06-15 | 1999-06-15 | Laser beam interference optical information recording/reproducing apparatus comprising holographic recording material and optical information recording/reproducing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP1999/003181 WO2000077779A1 (en) | 1999-06-15 | 1999-06-15 | Laser beam interference optical information recording/reproducing apparatus comprising holographic recording material and optical information recording/reproducing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2000077779A1 true WO2000077779A1 (en) | 2000-12-21 |
Family
ID=14235969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1999/003181 Ceased WO2000077779A1 (en) | 1999-06-15 | 1999-06-15 | Laser beam interference optical information recording/reproducing apparatus comprising holographic recording material and optical information recording/reproducing method |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2000077779A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03120625A (en) * | 1989-10-04 | 1991-05-22 | Canon Inc | Information recording and reproducing device |
| JPH03216824A (en) * | 1990-01-22 | 1991-09-24 | Hitachi Ltd | Optical information recording medium and optical information recording method |
| JPH05232850A (en) * | 1992-02-20 | 1993-09-10 | Toppan Printing Co Ltd | Holographic sensitive material and processing method thereof |
| JPH0737028A (en) * | 1993-07-15 | 1995-02-07 | Nippondenso Co Ltd | Information recording device |
-
1999
- 1999-06-15 WO PCT/JP1999/003181 patent/WO2000077779A1/en not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03120625A (en) * | 1989-10-04 | 1991-05-22 | Canon Inc | Information recording and reproducing device |
| JPH03216824A (en) * | 1990-01-22 | 1991-09-24 | Hitachi Ltd | Optical information recording medium and optical information recording method |
| JPH05232850A (en) * | 1992-02-20 | 1993-09-10 | Toppan Printing Co Ltd | Holographic sensitive material and processing method thereof |
| JPH0737028A (en) * | 1993-07-15 | 1995-02-07 | Nippondenso Co Ltd | Information recording device |
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