WO2004070714A1 - 光情報記録媒体 - Google Patents
光情報記録媒体 Download PDFInfo
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- WO2004070714A1 WO2004070714A1 PCT/JP2004/001250 JP2004001250W WO2004070714A1 WO 2004070714 A1 WO2004070714 A1 WO 2004070714A1 JP 2004001250 W JP2004001250 W JP 2004001250W WO 2004070714 A1 WO2004070714 A1 WO 2004070714A1
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- Prior art keywords
- light
- layer
- recording medium
- optical information
- information recording
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Classifications
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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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
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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
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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
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00772—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track on record carriers storing information in the form of optical interference patterns, e.g. holograms
- G11B7/00781—Auxiliary information, e.g. index marks, address marks, pre-pits, gray codes
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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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
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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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24047—Substrates
- G11B7/2405—Substrates being also used as track layers of pre-formatted layers
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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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B7/2572—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of organic materials
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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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24035—Recording layers
- G11B7/24044—Recording layers for storing optical interference patterns, e.g. holograms; for storing data in three dimensions, e.g. volume storage
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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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
- G11B7/2531—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising glass
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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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
- G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins
- G11B7/2534—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins polycarbonates [PC]
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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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
- G11B7/2585—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers based on aluminium
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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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
- G11B7/2595—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers based on gold
Definitions
- the present invention relates to an optical information recording medium on which information is recorded using holography. More specifically, when the reflecting surface provided on the substrate of the optical information recording medium is irradiated with the information light or the reference light for recording / reproducing Z, various kinds of adverse effects are generated, and the diffused light from the reflecting surface is not generated.
- the present invention relates to a structure of an optical information recording medium to be configured. Background technology
- holographic recording in which information is recorded on a recording medium using holography, generally, light having image information and reference light are superimposed inside the recording medium, and interference fringes created at that time are recorded on the recording medium. This is done by writing.
- the recording medium is irradiated with reference light, and the image information is reproduced by diffraction due to interference fringes.
- the optical information recording medium used for the holographic recording includes a plastic or glass substrate 1 having a serpit 3 provided thereon, and a reflective layer formed by evaporating a film of aluminum or the like thereon. 2, a hologram recording layer 4 made of a recording material and a substrate 5 are formed on the reflection layer.
- the information light and the recording reference light reach the reflective layer 2 and are reflected to generate light that is irregularly reflected.
- Other interference patterns can be created with the light. This interference pattern is unnecessary, may cause noise during reproduction, and has a problem that the original recording capacity of the recording medium cannot be achieved.
- the recording medium is made of a material that is not sensitive to red light, even if the light for the service slightly reflects irregularly by the reflective layer 2, it does not affect the recording capacity of the recording medium. Disclosure of the invention
- the present invention has been made in view of such a problem, and an object of the present invention is to prevent information light and reference light for recording / reproduction from being irregularly reflected from a reflective layer of an optical information recording medium and to ride on a reproduced image.
- An object of the present invention is to provide a structure of an optical information recording medium capable of reducing the amount of noise.
- An optical information recording medium is an optical information recording medium for recording information using holography, and includes a transparent substrate, a recording layer on which information is recorded by an interference pattern, a transparent substrate, and a recording layer. And a filter layer that transmits light of the first wavelength and reflects light of the second wavelength.
- the fill layer transmits light of a first wavelength (eg, red light) and reflects light of a second wavelength (eg, green light). This separates the two wavelengths of light.
- the transparent substrate has a serpit pattern, and a reflective layer is formed on the pattern. In this configuration, light of the second wavelength is prevented from reaching the reflective layer.
- a polarization direction change that polarizes the light change direction is performed between the recording layer and the filter layer.
- a layer for example, a layer consisting of a quarter-wave plate is provided. As a result, it is possible to prevent the polarization direction of the light from being changed, and prevent a ghost image from being generated by the reflection hologram.
- a layer made of a dichroic mirror or a layer made of a cholesteric liquid crystal can be used as the filter layer.
- a layer made of cholesteric liquid crystal is used as a filter layer, a combination with the above-described quarter-wave plate layer is effective.
- Cholesteric liquid crystals have the property of reflecting circularly polarized light in a predetermined direction and transmitting the other light.
- the reflection surface provided on the substrate is basically a metal reflection film, but may be a medium surface that reflects light and can be additionally written or erased.
- a gap layer for smoothing the substrate surface is provided between the filter layer and the reflection surface.
- the gap layer has a function of adjusting the size of the hologram recorded on the recording layer in addition to smoothing the substrate surface.
- FIG. 1 is a diagram showing the structure of a conventional optical information recording medium.
- FIG. 2 is a diagram showing a first embodiment according to the present invention.
- FIG. 3 is a diagram showing a second embodiment according to the present invention.
- FIG. 4 is a diagram showing a third embodiment according to the present invention.
- FIG. 5 is a diagram showing a fourth embodiment according to the present invention.
- FIG. 6 is a diagram showing an optical system around an optical information recording medium according to the present invention.
- FIG. 2 is a diagram showing a configuration of the optical information recording medium according to the first embodiment.
- a support pit is formed on a polycarbonate or glass substrate 1, and a reflective layer 2 is provided thereon by coating with aluminum, gold, platinum, or the like. I have.
- the servo pits are formed on the entire surface of the substrate, but they may be formed periodically as shown in FIG. Also, this The maximum height of the support pit is 175 OA, which is sufficiently smaller than the heat of the substrate and other layers.
- a red light transmitting filter layer 6 is provided on the substrate 1 with the reflective layer 2 and the hologram recording layer 4 is sandwiched between the red light transmitting filter layer 6 and the upper substrate 5 (polypropylene, glass, etc.).
- the optical information recording medium 100 is configured.
- the red light transmitting filter layer 6 transmits only red light and does not transmit light of other colors. Therefore, since the information light and the reference light for recording / reproduction are green or blue light, they do not pass through the filter layer 6, return to the reflection layer 2 without reaching the reflection layer 2, and exit from the entrance / exit surface A. Will be.
- the red light transmitting filter layer 6 is, for example, a cholesteric liquid crystal layer, and may be CM-33 manufactured by Chisso Corporation.
- a quarter-wave plate is provided between the filter layer (cholesteric liquid crystal layer) 6 and the input / output surface A in the optical information recording medium 101. Even if it is not included in the optical information recording medium 101 or as an optical configuration between the dichroic mirror 13 and the optical information recording medium 101 described later, What is necessary is just to arrange one wavelength plate.
- This quarter-wave plate shifts only the green light by a quarter wavelength, and when green light enters, it becomes circularly polarized light, but light of other colors (for example, red) When it is incident, it becomes elliptically polarized light.
- the optical information recording medium 101 in the present embodiment may have a disk shape or a force shape. In the case of a card shape, there is no need to have the service pit.
- the substrate 1 has a thickness of 0.6 mm
- the red light transmitting filter 6 has a thickness of 2 to 3 mm
- the hologram recording layer 4 has a thickness of 0.6 mm
- the substrate 5 has a thickness of 0.6 mm. The thickness is about 1.8 mm in total.
- the light (red light) emitted from the laser for reflection is reflected 100% by the dichroic mirror 13 and passes through the objective lens 12.
- the objective lens 12 irradiates the optical information recording medium 101 with the servo light so as to be focused on the reflective layer 2.
- the dichroic mirror 13 transmits green or blue wavelength light and reflects red wavelength light by approximately 100%.
- Optical information recording medium 1 0 1 The incident light from the light input / output surface A passes through the substrate 5, the hologram recording layer 4, and the red transmission filter layer 6, is reflected by the reflection layer 2, and is again reflected by the filter layer 6, The light passes through the program recording layer 4 and the substrate 5 and exits from the entrance / exit surface A. The emitted return light passes through the objective lens 12, is reflected 100% by the dichroic mirror 13, and the support information detector (not shown) detects the support information. The detected support information is used for a focus service, a tracking service, a slide service, and the like.
- the hologram material forming the hologram recording layer 4 is not exposed to red light, it is assumed that the service light passes through the hologram recording layer 4 or the support light is irregularly reflected by the reflection layer 2. Does not affect the hologram recording layer 4. Also, the return light from the reflection layer 2 for the service light is almost 100% reflected by the dichroic mirror 13, so that the light for the support is used for detecting the reproduced image. It is not detected by the MOS sensor or CCD 14 and does not generate noise for the reproduction light.
- the information light and the recording reference light generated from the recording Z reproduction laser pass through the dichroic mirror 13, and the information light and the recording reference light are converted into a front gram by the objective lens 11.
- the optical information recording medium 101 is irradiated so as to generate a interference pattern in the recording layer 4.
- the information light and the recording reference light enter from the entrance / exit surface A and interfere with each other in the holo-drum recording layer 4 to generate an interference pattern there. Thereafter, the information light and the recording reference light pass through the hologram recording layer 4 and enter the red light transmission filter layer 6, but are reflected back to the bottom surface of the layer to become return light. That is, the information light and the recording reference light do not reach the reflective layer 2. This is because the red light transmitting filter layer 6 has a property of transmitting only red light.
- FIG. 3 is a diagram illustrating a configuration of an optical information recording medium according to the second embodiment.
- a servo pit is formed on a polycarbonate or glass substrate 1, and a reflective layer 2 is provided thereon by coating with aluminum, gold, platinum, or the like. ing. Further, the point that the height of this serpentine is a maximum of 1750 A is the same as in the first embodiment.
- the difference between the structure of the second embodiment and the structure of the first embodiment is that the optical information recording medium 102 according to the second embodiment has a gap layer 8 and the optical information recording medium 10.
- a dichroic mirror layer 9 is provided instead of the filter layer 6 of FIG. 1, and a quarter-wave plate layer 7 is provided between the dichroic mirror layer 9 and the hologram recording layer 4. That is.
- the gap layer 8 is formed by applying a material such as a UV resin on the reflective layer 2 of the substrate 1 by spin coating or the like.
- the gap layer 8 is effective for protecting the reflection layer 2 and for adjusting the size of the hologram generated in the photographic recording layer 4. That is, it is necessary to form the interference area between the recording reference light and the information light in the hologram recording layer 4 to some extent. Therefore, it is effective to provide a gap between the hologram recording layer 4 and the servo pit.
- the dichroic mirror layer 9 is formed by coating a dielectric multilayer film (sputtering) on the gap layer 8 with a wavelength separation filter.
- the dichroic mirror in the second embodiment has a property of reflecting green light and transmitting other light (for example, red).
- the quarter-wave plate layer 7 is formed by spin-coating a material for generating a phase difference, for example, azobenzene on the dichroic mirror layer 9.
- the film formed by azobenzene has optical anisotropy and has the property of aligning molecules in the direction perpendicular to the polarized light to be irradiated.
- the quarter-wave plate layer 7 can be generated by using a so-called lapping process.
- a linearly-polarized light such as P-polarized light or S-polarized light enters the quarter-wave plate, the direction of the linearly polarized light forms an angle of 45 degrees with the optical axis of the crystal in the quarter-wave plate.
- the transmitted light is changed from linearly polarized light to circularly polarized light, and conversely, when circularly polarized light is incident, the light is converted to linearly polarized light.
- the quarter-wave plate layer 7 has the function of removing the ghost caused by the reflection type hologram (Horizontal Fringe). If the effect of the ghost can be ignored, No layer is required.
- the substrate 1 is 0.6 mm
- the gap layer 8 is 2 to 3 m
- the dichroic mirror layer 9 is 1 zm or less
- the quarter-wave plate layer 7 is 2 mm. 0 m or less
- the hologram recording layer 4 has a thickness of 0.6 mm
- the substrate 5 has a thickness of 0.6 mm. The total is approximately 1.8 mm.
- the optical information recording medium 102 having such a structure is irradiated with red support light, green information light, and recording / reproduction reference light.
- the servo light enters from the entrance / exit surface A, passes through the hologram recording layer 4, the quarter-wave plate layer 7, the dichroic mirror layer 9, and the gap layer 8, is reflected by the reflection layer 2, and is returned. It becomes.
- This return light passes through the gap layer 8, the dich-original mirror layer 9, the quarter-wave plate layer 7, the hologram recording layer 4, and the substrate 5 in this order, and is emitted from the input / output surface A.
- the emitted return light is used for a focus servo, tracking servo, or the like.
- the hologram material constituting the hologram recording layer 4 Since the hologram material constituting the hologram recording layer 4 is not exposed to red light, the light for the sample passes through the hologram recording layer 4 or the light for the sample is reflected on the reflection layer 2. Even if the light is irregularly reflected by the hologram recording layer 4, the hologram recording layer 4 is not affected.
- the green information light or the like enters from the entrance / exit surface A, passes through the hologram recording layer 4 and the quarter-wave plate layer 7, is reflected by the dichroic mirror layer 9, and becomes return light. This return light passes through the quarter-wave plate layer 7, the hologram recording layer 4, and the substrate 5 again in this order, and is emitted from the input / output surface A.
- the reproduction light is reflected by the dichroic mirror layer 9 depending on the recording method, that is, whether to record a reflection hologram or a transmission hologram.
- FIG. 4 is a diagram illustrating a configuration of an optical information recording medium according to the third embodiment.
- a cholesteric liquid crystal layer 10 is provided instead of the dichroic mirror layer 9 in the second embodiment.
- Other configurations are the same as those of the second embodiment.
- the cholesteric liquid crystal layer 10 also has a thickness of 1 to 2 Aim, and the optical information recording medium as a whole has a thickness of about 1.8 mm as in the other embodiments.
- the cholesteric liquid crystal layer 10 is formed by forming a gap layer (smooth layer) 8 and then applying, for example, a cholesteric liquid crystal CM-33 (manufactured by Chisso Corporation), which is a capillary, and spin-coating.
- CM-33 manufactured by Chisso Corporation
- a cholesteric liquid crystal reflects circularly polarized light in a predetermined direction when it enters the cholesteric liquid crystal, and receives other light, for example, circularly polarized light in the opposite direction, linearly polarized light, or elliptically polarized light. It has the property of transmitting light.
- the quarter-wave plate layer 7 has such a property that only the green light is shifted by a quarter wavelength. That is, in the quarter-wave plate layer 7, when linearly polarized green light (information light and reference light) enters, the light is changed to circularly polarized green light, and linearly polarized red light (servo light). ) Is changed to elliptically polarized red light when is incident. Therefore, the green information light and reference light changed from linearly polarized light to circularly polarized light by the quarter-wave plate layer 7 are reflected by the cholesteric liquid crystal layer 10 and do not reach the reflective layer 2.
- the red light serving as the support light which has been changed from linearly polarized light to elliptically polarized light by the quarter-wave plate layer 7, passes through the cholesteric liquid crystal layer 10 and reaches the reflective layer 2, and the return light is reflected by a forus sensor. Used for tracking services and the like.
- FIG. 5 is a diagram illustrating a configuration of an optical information recording medium according to the fourth embodiment.
- the reflective layer 2 in the third embodiment is not a simple metal reflection film such as A1, but a write-once or rewritable recording medium.
- a phase change film is provided, and other configurations are the same as those of the third embodiment. Therefore, the function of the cholesteric liquid crystal layer 10 is the same as that of the third embodiment, and the description is omitted.
- the optical information recording medium 100 having the configuration shown in FIG. 1 information light and reference light (green light) having a high light intensity are also focused on this reflective surface when recording a hologram. Even if an attempt is made to have a write-once function using the same red light as the one-point light, there is a problem in securing reliability. In addition, the reflectivity of these write-once or rewritable films is There is also a problem that the reproduction efficiency of the hologram is reduced because it is not so high. However, in the method according to the present embodiment, the reflectivity of green light can be set independently by the cholesteric liquid crystal layer 10 which is a wavelength separation layer. There is an advantage that a low reflectance may be used.
- a polarization direction changing layer for polarizing the light changing direction for example, a layer made of a quarter-wave plate is provided between the recording layer and the filter layer.
- the information light, the reference light, and the reproduction light used during recording or reproduction do not reach the reflective layer 2 or 11, diffused light is generated due to irregular reflection on the reflective surface. Can be prevented. Therefore, the noise generated by the diffused light is not superimposed on the reproduced image and detected on the CMOS sensor or the CCD 14, and the reproduced image can be detected at least to the extent that the error can be corrected.
- the noise component due to the diffused light becomes a greater problem as the multiplicity of the hologram increases. In other words, as the multiplicity increases, for example, when it exceeds 100, the diffraction efficiency from one hologram becomes extremely small, and it becomes very difficult to detect a reproduced image when there is diffusion noise.
- the servo pit is not limited to the sample servo, but can take any form of pre-pit structure. Further, the interval between the pits can be arranged independently of the hologram size.
- the polarization of the incident light and the exit light of the quarter-wave plate layer 7 are made orthogonal to each other, and the polarization beam splitter (not shown) used in the recording and reproducing optical system is used. And can detect most of the generated reproduction light, resulting in high light use efficiency.
- This combination is also very effective for removing unnecessary stray light such as surface reflection of an optical element generated on the laser light source side (not shown) with respect to the quarter-wave layer 7.
- the arrangement of the servo pits and the hologram recording are optically separated, no matter what pit format is adopted, the recording density does not decrease. Therefore, a sufficient frequency band can be given to the service control signal, and the accuracy of the service can be improved to be equal to or higher than that of the conventional optical disc.
- the present invention it is possible to freely select the reflectance of the reflective film for the service and to freely select the material of the reflective film. Therefore, as in the fourth embodiment, using a recording medium that can be additionally written or rewritten on the reflective layer 11, for example, a DVD (Digital Video, Disk), etc. It is also possible to add and / or rewrite directory information, such as when it was rewritten and in which part an error was present and how the replacement process was performed, without affecting the hologram.
- the filter layer which is a wavelength separation film
- the objective lens caused by the shift between the reflection surface by the filter layer 6, 9, or 10 and the reflection surface by the reflection layer 2 or 11 The effect of the optical aberrations on this is negligible.
- red light is used as the servo light and green light is used as the recording / reproducing light.
- the present invention is not limited to this, and a combination of lights having other wavelengths is possible depending on the properties of the medium. For example, when a chalcogenide-based material is used as a recording material, blue light is used for servo and red light is used for recording and reproduction. This is because this material has sensitivity to red light.
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Abstract
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/545,080 US7719952B2 (en) | 2003-02-06 | 2004-02-06 | Optical information recording medium |
EP04708872A EP1596376A4 (en) | 2003-02-06 | 2004-02-06 | OPTICAL INFORMATION RECORDING MEDIUM |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US44555803P | 2003-02-06 | 2003-02-06 | |
US60/445,558 | 2003-02-06 | ||
JP2003050645A JP4200026B2 (ja) | 2003-02-06 | 2003-02-27 | 光情報記録媒体 |
JP2003-050645 | 2003-02-27 |
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WO2004070714A1 true WO2004070714A1 (ja) | 2004-08-19 |
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PCT/JP2004/001250 WO2004070714A1 (ja) | 2003-02-06 | 2004-02-06 | 光情報記録媒体 |
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EP (1) | EP1596376A4 (ja) |
WO (1) | WO2004070714A1 (ja) |
Cited By (8)
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EP1768120A2 (en) * | 2005-09-14 | 2007-03-28 | FUJIFILM Corporation | Optical recording medium and production method thereof, and optical recording apparatus and optical reproducing apparatus |
US20070148556A1 (en) * | 2003-12-22 | 2007-06-28 | Yoshihito Maeno | Photosensitive composition for volume hologram recording |
EP1768114A3 (en) * | 2005-08-24 | 2007-11-28 | FUJIFILM Corporation | Optical recording method, optical recording apparatus, optical recording medium and optical reproducing method |
EP1764796A3 (en) * | 2005-09-07 | 2007-12-05 | FUJIFILM Corporation | Optical recording medium and production method thereof |
EP1760707A3 (en) * | 2005-09-06 | 2007-12-05 | FUJIFILM Corporation | Optical recording medium, method of producing the same, and, optical recording method and optical reproducing method |
EP1768119A3 (en) * | 2005-08-25 | 2007-12-19 | FUJIFILM Corporation | Optical information recording medium, optical information recording method and optical information reproducing method |
EP1909269A1 (en) * | 2005-06-22 | 2008-04-09 | Fujifilm Corporation | Optical recording method, optical recording device and optical recording medium |
US8014260B2 (en) * | 2005-12-21 | 2011-09-06 | Fujifilm Corporation | Optical information recording medium, information recording method and information recording system |
Families Citing this family (3)
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JP2007171673A (ja) * | 2005-12-22 | 2007-07-05 | Fujifilm Corp | 光記録媒体、並びに光記録装置、光記録方法及び光再生方法 |
JP2007207386A (ja) * | 2006-02-03 | 2007-08-16 | Fujifilm Corp | 光記録再生装置、光記録方法及び光再生方法 |
EP2337026A1 (en) * | 2009-12-18 | 2011-06-22 | Thomson Licensing | Optical recording medium and apparatus and method for reading from the medium |
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US7130092B1 (en) * | 1998-02-27 | 2006-10-31 | Optware Corporation | Apparatus and method for recording and reproducing optical information |
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KR100691320B1 (ko) * | 2000-02-10 | 2007-03-12 | 엘지.필립스 엘시디 주식회사 | 콜레스테릭 액정 컬러필터를 갖는 반사형 액정표시장치 |
KR100715906B1 (ko) * | 2000-12-26 | 2007-05-08 | 엘지.필립스 엘시디 주식회사 | Clc 컬러필터의 제조방법 |
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JPS59217244A (ja) * | 1983-05-24 | 1984-12-07 | Victor Co Of Japan Ltd | 情報信号記録円盤 |
JPS63188090A (ja) * | 1987-01-30 | 1988-08-03 | Hitachi Ltd | 光記録および再生方法 |
WO1996016401A1 (fr) * | 1994-11-17 | 1996-05-30 | Matsushita Electric Industrial Co., Ltd. | Appareil generateur de marquage, procede de formation d'un marquage au laser sur disque optique, appareil de reproduction, disque optique et procede de production de disque optique |
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Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
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US20070148556A1 (en) * | 2003-12-22 | 2007-06-28 | Yoshihito Maeno | Photosensitive composition for volume hologram recording |
US7742380B2 (en) | 2005-06-22 | 2010-06-22 | Fujifilm Corporation | Optical recording method, optical recording apparatus and optical recording medium |
EP1909269A1 (en) * | 2005-06-22 | 2008-04-09 | Fujifilm Corporation | Optical recording method, optical recording device and optical recording medium |
EP1909269A4 (en) * | 2005-06-22 | 2008-11-26 | Fujifilm Corp | OPTICAL RECORDING METHOD, OPTICAL RECORDING DEVICE, AND OPTICAL RECORDING MEDIUM |
EP1768114A3 (en) * | 2005-08-24 | 2007-11-28 | FUJIFILM Corporation | Optical recording method, optical recording apparatus, optical recording medium and optical reproducing method |
US7742379B2 (en) | 2005-08-24 | 2010-06-22 | Fujifilm Corporation | Optical recording method, optical recording apparatus, optical recording medium, and optical reproducing method |
EP1768119A3 (en) * | 2005-08-25 | 2007-12-19 | FUJIFILM Corporation | Optical information recording medium, optical information recording method and optical information reproducing method |
US7894319B2 (en) | 2005-09-06 | 2011-02-22 | Fujifilm Corporation | Optical recording medium, method of producing the same, and, optical recording method and optical reproducing method |
EP1760707A3 (en) * | 2005-09-06 | 2007-12-05 | FUJIFILM Corporation | Optical recording medium, method of producing the same, and, optical recording method and optical reproducing method |
EP1764796A3 (en) * | 2005-09-07 | 2007-12-05 | FUJIFILM Corporation | Optical recording medium and production method thereof |
EP1768120A3 (en) * | 2005-09-14 | 2008-03-05 | FUJIFILM Corporation | Optical recording medium and production method thereof, and optical recording apparatus and optical reproducing apparatus |
EP1768120A2 (en) * | 2005-09-14 | 2007-03-28 | FUJIFILM Corporation | Optical recording medium and production method thereof, and optical recording apparatus and optical reproducing apparatus |
US8014260B2 (en) * | 2005-12-21 | 2011-09-06 | Fujifilm Corporation | Optical information recording medium, information recording method and information recording system |
Also Published As
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EP1596376A4 (en) | 2008-10-29 |
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