WO2004030919A1 - 光情報記録担体およびそれを用いた記録再生装置 - Google Patents
光情報記録担体およびそれを用いた記録再生装置 Download PDFInfo
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- WO2004030919A1 WO2004030919A1 PCT/JP2003/011220 JP0311220W WO2004030919A1 WO 2004030919 A1 WO2004030919 A1 WO 2004030919A1 JP 0311220 W JP0311220 W JP 0311220W WO 2004030919 A1 WO2004030919 A1 WO 2004030919A1
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- optical information
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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
- G11B7/24038—Multiple laminated recording layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
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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
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
- G11B7/245—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing a polymeric component
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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
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
- G11B7/246—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes
- G11B7/247—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes methine or polymethine dyes
- G11B7/2475—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes methine or polymethine dyes merocyanine
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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
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
- G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete 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
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24302—Metals or metalloids
- G11B2007/24304—Metals or metalloids group 2 or 12 elements (e.g. Be, Ca, Mg, Zn, Cd)
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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
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24318—Non-metallic elements
- G11B2007/2432—Oxygen
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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
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24318—Non-metallic elements
- G11B2007/24324—Sulfur
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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
- G11B7/24—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
- G11B7/254—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 protective topcoat layers
- G11B7/2542—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 protective topcoat layers consisting essentially of organic resins
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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
- G11B7/2575—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 resins
Definitions
- the present invention relates to an optical information recording carrier, and a method and an apparatus for recording / reproducing information on the optical information recording carrier.
- the recording density of an optical disk is proportional to the wavelength ( ⁇ ) of the recording / reproducing light and the numerical aperture ( ⁇ ⁇ ) of the objective lens.
- ⁇ the wavelength of the recording / reproducing light
- NA the numerical aperture of the objective lens.
- the working distance (WD) of the objective lens decreases.
- a protective layer having a sufficient thickness cannot be formed on the recording layer.
- NA is larger than the above value (0.85)
- WD becomes smaller, so that the thickness of the protective layer becomes 100 m or less in consideration of the disk tilt margin.
- the thickness of the protective layer is less than 100 m, the dirt attached to the disk surface (that is, the surface of the protective layer) becomes very close to the recording layer, which is the signal surface, so that a little dirt attached to the disk surface Also, the disc reproduction signal may be degraded.
- Figure 7 shows an example of an optical disc with a multi-layered recording layer.
- a translucent recording layer 51 is formed on a holding substrate 56, and a heat insulating layer 53 and a translucent recording layer 51 are alternately formed thereon. Have been.
- the uppermost translucent recording layer 51 is covered with a protective layer 50.
- the translucent recording layer 51 when light is focused on the translucent recording layer 51 to be recorded, light is absorbed by the translucent recording layer 51.
- the translucent recording layer 51 that has absorbed light locally generates heat and causes phase transition and deformation, Using this, a signal can be recorded on the translucent recording layer 51. Therefore, as shown in FIG. 7, by laminating a plurality of translucent recording layers 51, information can be recorded in multiple layers, and the recording density can be improved.
- the conventional translucent recording layer 51 is multi-layered, when the light is focused on the translucent recording layer 51 to be recorded, another translucent recording layer on the light incident side of the translucent recording layer 51 is used. 51 is also irradiated with light, and light absorption occurs in the other translucent recording layer 51 as well. As a result, there is a problem that light reaching the translucent recording layer 51 to be recorded is attenuated. Therefore, when the number of the translucent recording layers 51 to be laminated is 4 to 5 or more, the attenuation of light increases, and it becomes difficult to record on the translucent recording layer 51 deeper. Is limited.
- Japanese Patent No. 2961126 discloses that a pulsed laser is condensed and radiated into a glass matrix, and a photo-induced change in refractive index, which is thought to be caused by rearrangement of charged particles caused by defects, is observed in a minute spot. The information is recorded as a spatial refractive index distribution. " This photoinduced refractive index change utilizes multiphoton absorption that occurs when glass is irradiated with strong light.
- Multiphoton absorption occurs when the material is illuminated with light of sufficient intensity, not when the material is illuminated with light of normal intensity. Therefore, if a layer that is transparent to the wavelength of the recording light (hereinafter, sometimes referred to as a “transparent recording layer”) is used as a recording layer using multiphoton recording, it will be more difficult than a transparent recording layer to record. Is also on the light incident side Even if the other transparent recording layer is irradiated with light, its intensity is relatively weak because it is not a condensed light, and multiphoton absorption does not occur. Therefore, light can pass through the other transparent recording layer without being attenuated.
- transparent recording layer a layer that is transparent to the wavelength of the recording light
- the light intensity is sufficiently large to cause multiphoton absorption, which causes a change in the light-induced refractive index.
- a spot having a different refractive index from that of the region is formed.
- a recording layer 57 disclosed in the above patent document is provided between the substrate 56 and the protective film 50 (FIG. 8).
- the recording layer 57 is made of a material containing silica glass as a main component.
- multiphoton absorption occurs only in the vicinity of the focal point 3 where light is condensed, and a light-induced refractive index change occurs. Therefore, by adjusting the position of the focal point 3, data can be recorded on a plurality of layers. As a result, a plurality of recording signal trains 55 are formed.
- multiphoton absorption refers to a phenomenon in which a substance absorbs a plurality of photons (same or different) (absorption accompanied by a plurality of transitions). Absorption with only a single transition process) is sometimes referred to as “single-photon absorption”.
- the conventional recording layers utilizing the photo-induced refractive index change are formed of an inorganic material such as silica glass as described in the above patent document. This is because there are many inorganic materials that can be recorded with relatively high sensitivity by generating a photo-induced refractive index change, and if an inorganic material is used, an oxide film, a nitride film, or a sulfide film of the inorganic material is used. This is because a transparent layer can be obtained relatively easily by forming a film or the like. As mentioned earlier, the recording layer If it is basically transparent to the light of the recording wavelength, the above-mentioned problem of light attenuation does not occur, so that it is possible to record satisfactorily on multiple layers.
- the configuration of the multilayer recording shown in FIG. 8 is very simple and easy to mass-produce, but has a problem that the recording / reproducing sensitivity is low. This is because the above-described method using the photo-induced refractive index change records information as spots having different refractive indexes, and therefore has lower recording / reproducing sensitivity than the method of recording information as physical pits. .
- the present invention has been made in view of the above points, and a main object of the present invention is to improve the recording Z reproduction sensitivity of an optical information recording carrier using multiphoton absorption. Disclosure of the invention
- the optical information recording carrier of the present invention is an optical information recording carrier comprising: a substrate; and a laminate formed on the substrate and including at least one recording layer, wherein the at least one recording layer is polydiacetylene. Or it contains merocyanine and is amorphous.
- the laminate includes a thermoplastic resin layer disposed so as to be in contact with at least one surface of the at least one recording layer.
- Another optical information recording carrier of the present invention is an optical information recording carrier comprising: a substrate; and a laminate formed on the substrate and including at least one recording layer, wherein the laminate comprises: It further comprises a thermoplastic resin layer disposed so as to be in contact with at least one surface of the at least one recording layer.
- the at least one recording layer contains at least one compound selected from the group consisting of tellurium oxide, zinc oxide and zinc sulfide, and is amorphous.
- the heat-insulating layer further includes a heat-insulating layer that suppresses transmission of heat generated in the at least one recording layer, wherein the thermoplastic resin layer is disposed so as to be in contact with one surface of the at least one recording layer.
- the recording layer may be arranged so as to be in contact with the other surface of at least one recording layer.
- the heat insulating layer may include a thermosetting resin or an inorganic oxide or an inorganic sulfide different from the material of the at least one recording layer.
- the at least one recording layer is substantially transparent to the writing light of the first wavelength and the reading light of the second wavelength, and generates multiphoton absorption for the writing light.
- the third-order nonlinear constant of the material of the at least one recording layer is 0.5
- X 1 0 - is preferably 1 2 esu or more.
- the second wavelength is about ⁇ of the first wavelength.
- the thickness of the at least one recording layer may be set so as to be a non-reflection condition for the writing light and a reflection condition for the reading light. .
- the at least one recording layer may be plural, and the plural recording layers may be separated from each other by a separation layer. It is preferable that information is recorded in multiple layers in the at least one recording layer.
- the method according to the present invention is a method for recording and / or reproducing information on / from the optical information recording carrier, wherein the writing light is focused on the at least one recording layer of the optical information recording carrier, And a recording step including a step of causing multi-photon absorption locally in the at least one recording layer, and focusing or reflecting the Z or readout light on the at least one recording layer of the optical information record carrier.
- a regeneration step for detecting light is included.
- An apparatus is an apparatus for recording and / or reproducing information on or from the optical information recording carrier, wherein the writing light is focused on the at least one recording layer of the optical information recording carrier, And a recording step including a step of causing multi-photon absorption locally in the at least one recording layer, and focusing or reflecting the Z or readout light on the at least one recording layer of the optical information record carrier.
- a regeneration step for detecting light is performed.
- the second wavelength is about 1Z2 times the first wavelength.
- one writing time length of the writing light is 15 picoseconds or more and 15 nanoseconds or less.
- FIG. 1 is a cross-sectional view schematically showing an optical information recording carrier of an embodiment according to the present invention.
- FIG. 2 is a cross-sectional view schematically showing an optical information recording carrier according to another embodiment of the present invention.
- FIG. 3 is a cross-sectional view schematically showing an optical information recording carrier of still another embodiment according to the present invention.
- FIG. 4 is a diagram showing the spectral characteristics of merocyanine.
- FIG. 5 is a diagram showing the spectral characteristics of polydiacetylene.
- FIG. 6 is a diagram showing a configuration of a recording / reproducing apparatus according to an embodiment of the present invention.
- FIG. 7 is a cross-sectional view showing a configuration of a conventional optical information recording carrier having a multilayer structure.
- FIG. 8 is a cross-sectional view showing a configuration of an optical information recording carrier using multiphoton absorption.
- the present inventor did not use the photoinduced refractive index change, but generated heat efficiently by multiphoton absorption, and performed thermal deformation.
- the conventional recording layer using photoinduced refractive index change causes multiphoton absorption, but it is difficult to form a physical pit due to thermal deformation.
- the recording layer 57 shown in FIG. 8 is formed of an inorganic glass material (silica glass) such as an inorganic oxide, an inorganic nitride, and an inorganic sulfide.
- an inorganic glass material silicon glass
- silicon oxide silicon oxide
- an inorganic nitride silicon dioxide
- an inorganic sulfide silicon dioxide
- a pit due to thermal deformation is formed. It is hard to be. That is, the recording sensitivity is low. There are three main reasons for this.
- the recording layer 57 made of the above material has a high thermal conductivity, heat generated at the focal point 3 is easily diffused to the periphery of the focal point 3 of the recording layer 57. Therefore, as a result of suppressing the heat rise at the focal point 3, the recording layer 57 is less likely to be thermally deformed.
- an inorganic compound (glass) such as silica glass has a higher heat distortion temperature than the metal compound used for the recording layer that generates single-photon absorption, and is hard. Therefore, even if multiphoton absorption occurs at the focal point 3 of the recording layer 57 and heat is generated, deformation near the focal point 3 hardly occurs.
- third-order nonlinear constant of the silica force the glass is small (0. 0 1 X 1 0 - 12 esu) , so even if the multiphoton absorption hardly fever (low heat generation efficiency).
- a concrete comparison between the heat distortion temperature of the inorganic compound (glass) and the heat distortion temperature of the metal compound is as follows.
- a Te metal compound for example, 60 Te 20 Ge 10 Ab
- the melting temperature of this metal compound is about 230 ° C.
- the melting temperature of the multiphoton absorption likely to cause recording material for example oxide T e compounds (2 0 mol% of tellurium oxide containing N a (2 ON a 8 0 T e 0 2)) is 5 0 0.
- multiphoton absorption recording forming a physical pit in a recording layer of an inorganic glass material using multiphoton absorption (hereinafter referred to as “multiphoton absorption recording”) is not possible.
- Difficult, and multi-absorption recording requires that light having an extremely large amount of light be focused on the recording layer. Therefore, the output light amount of a semiconductor laser conventionally used as a recording light source of an optical disc is often not enough to form pits in such a recording layer.
- a high-power laser such as a YAG laser can be used as a recording light source having a larger output light quantity than a semiconductor laser.
- the recording layer has a lower thermal conductivity, a lower thermal deformation temperature, and a third-order nonlinear constant. It has been found that a large material should be included. If the thermal conductivity of the material of the recording layer is low, the local temperature rise rate of the recording layer can be increased. If the thermal deformation temperature of the material of the recording layer is low, the recording layer is easily deformed by heat due to multiphoton absorption. Also, if the third-order nonlinear constant is large, the efficiency of heat generation due to multiphoton absorption is high.
- optical information recording carrier broadly includes a carrier on which information is recorded / reproduced using light, and is typically an optical disc.
- recording in multiple layers means recording an information signal sequence in multiple layers between the substrate and the surface of the optical information recording carrier.
- an information signal sequence may be recorded in one recording layer in multiple layers, or one information signal sequence may be recorded in each of a plurality of stacked recording layers.
- wavelength lambda w of the recording light were set a wavelength lambda r of the reproduction light (read light) and 40 0 nm. Any of these wavelengths can be emitted by a conventional semiconductor laser. The reason why the wavelength of the reproduction light is set to be shorter than the wavelength of the recording light will be described below.
- the size (pit diameter) of the pit formed on the recording layer in the conventional recording layer that generates single-photon absorption is ⁇ W / NA ( m).
- the pit diameter formed in the recording layer is A w VNA (u rn), which is smaller than the conventional pit diameter ( ⁇ W / NA).
- the optical information recording carrier of the present embodiment has the same configuration as the conventional optical disc shown in FIG. The difference is the material of the recording layer 57.
- the optical information recording carrier of the present embodiment includes a substrate 56 and a recording layer 57 formed on the substrate 56.
- the substrate 56 is made of, for example, polycarbonate.
- the recording layer 57 is formed of a material (merocyanine-based compound) containing merosyanine (thermal conductivity: 0.08 to 0.2 W / m ⁇ K). Further, since the recording layer 57 is amorphous, it is transparent to the reproduction light and the recording light.
- the thickness of the recording layer 57 is, for example, 50 zm.
- the surface of the recording layer 57 is preferably covered with a protective film 50 for protecting the recording layer 57.
- recording light (wavelength: 800 nm) 2 emitted from a light source or the like is converged on the recording layer 57 by the objective lens 1.
- the focused portion (near the focal point) 3 of the recording layer 57 generates heat due to multiphoton absorption and is locally deformed by the heat. As a result, a pit is formed near the focal point 3.
- reproduction light 2 (wavelength: 400 nm) emitted from a light source or the like is collected on the recording layer 57 by the objective lens 1. Light, and the reflected light is detected. Put out. Thus, information can be read from the pit formed on the recording layer 57.
- the optical information recording carrier has the above configuration, and therefore has high recording sensitivity for the following reasons.
- ⁇ 0.2 W / mK is smaller than the thermal conductivity (1-2 W / mK) of conventional recording materials, for example, silica glass, so that the heat generated near the focal point 3 Because it is difficult to expand, heat can be used with higher efficiency.
- merocyanine-based compounds have a relatively low heat distortion temperature, so that pits are easily formed by heat due to multiphoton absorption.
- third-order nonlinear constant of main Roshianin is large (8 1 x 1 0 one 12 esu) of a, a high efficiency of heat generation due to the multiphoton absorption.
- the thermal conductivity of the merocyanine-based compound is extremely small, as shown in FIG. 8, the information signal sequence 55 is recorded in a single recording layer 57 over a plurality of stages. Children will be possible. Therefore, recording can be performed at a high density. Further, the productivity of the optical information recording carrier having such a structure is extremely high.
- the recording layer 57 is transparent to the recording light and the reproducing light and can be in an amorphous state, even if light of different wavelengths is used as the recording light and the reproducing light, the problem of attenuation does not occur. .
- the thickness of the recording layer 5-7 is not limited to the above, the recording light (A w: 8 0 0 nm ) with respect to a non-reflecting condition, and reproduction light ( ⁇ r: 40 0 nm) reflective to It is preferable that the condition is set. As a result, there is no reflected light for the recording light, so the maximum recording efficiency And a reflection condition is satisfied for the reproduction light, so that a high-quality reproduction signal can be detected. More preferably, the thickness of the recording layer 57 is set so as to satisfy the maximum reflection condition for the reproduction light.
- the wavelengths of the recording light and the reflected light are not limited to the above, but the wavelength of the reproduction light is preferably about 1 Z 2 of the wavelength of the recording light. This is advantageous because the thickness of the recording layer 57 can be set so as to satisfy the non-reflection condition for the recording light and the maximum reflection condition for the reproduction light. For example, 4 0 5 nm wavelength lambda w of the recording light, the wavelength lambda r of the reproduction light may be 8 1 0 ⁇ m.
- a sample disk 1 is prepared, for example, by the following method.
- merocyanine is dissolved in black-mouthed form to obtain a merocyanine solution.
- the merocyanine solution is applied onto a substrate 56 made of poly-polyponate.
- the applied amount of the merocyanine solution is adjusted so that the thickness of the merocyanine layer is, for example, 1 m.
- a known coating method such as a spin coating method can be employed. In this way, a sample disk 1 having the substrate 56 formed with the melanin cyanine layer is obtained.
- the aperture form can also act as a solvent for the carbonate
- the substrate 56 made of polycarbonate may be damaged.
- a protective film may be formed on the surface of the substrate 56 before applying the merocyanine solution in order to prevent this.
- the protective film can be formed using, for example, a UV curable resin.
- Fig. 4 shows the results of measuring the spectral characteristics of the melocyanin layer using the sample disk.
- the recording layer 57 has a low absorptance for light having a wavelength of 800 nm and light having a wavelength of 400 nm. That is, it shows good transmission characteristics for light of these wavelengths.
- a laser beam with a wavelength of 800 nm emitted from a pulsed semiconductor laser with a peak output of 600 mw, an output pulse width of 5 nanoseconds and an NA of 0.85 was applied to the sample disk 1.
- a good signal pit can be recorded on the melosyanin layer.
- the recording sensitivity of the merocyanine layer is high, it can be seen that recording can be performed on the merocyanine layer using a conventional semiconductor laser.
- the length of one light emission time of the recording light emitted from a semiconductor disk or the like be 15 nanoseconds or more and 15 picoseconds or less, because the maximum sensitivity can be obtained.
- the thickness of the sample disk 1 was 1 m
- a recording layer having a thickness of about 50 // m was formed with a similar cyanine-based compound
- a single layer was formed using the semiconductor laser described above.
- the information signal sequence 55 can be recorded in a plurality of stages in the recording layer 57 of the first embodiment.
- one recording layer 57 is provided on the substrate 56 as shown in FIG. 8, but instead, a plurality of recording layers 57 are stacked as shown in FIG. Is also good. In this case, one layer of information is recorded on each recording layer 57.
- the information signal sequence 55 may be recorded, or the information signal sequence 55 of two or more stages may be recorded.
- the material of the separation layer 53 it is preferable to select a resin or an inorganic material that is not damaged by the solvent of the recording layer 57 formed on the separation layer 53. It can be easily formed by a known method using a resin.
- an organic material is used as a recording material, but the recording material of the present invention is not limited to an organic material.
- Various inorganic materials were also examined from the viewpoint of recording sensitivity. As a result, even if a material obtained by adding lithium, sodium, tungsten, or the like to tellurium oxide (tellurium dioxide) was used as a multiphoton absorption recording material, the results were high. It was found that a sensitive recording layer could be formed. Similarly, a highly sensitive recording layer can be formed by using zinc oxide, zinc sulfide, or the like.
- the optical information recording carrier of this embodiment has the same configuration as that of the optical information recording carrier described in Embodiment 1 with reference to FIG. 8, but the recording layer 57 is made of polydiacetylene (thermal The difference is that a material containing conductivity: 0.08 to 0.2 W / m ⁇ K) is used. Since polydiacetylene has a small thermal conductivity like melonianin and is liable to undergo thermal deformation, the recording layer 57 in the present embodiment has the same high recording capacity as the recording layer made of the merocyanine-based compound in Embodiment 1. Indicating sensitivity, In order to check the recording sensitivity of the present embodiment, a sample disk 2 is manufactured by the following method.
- a polydiacetylene solution is obtained by dissolving a polydiacetylene monomer in ethyl acetate. This polyacetylene solution is applied onto a polycarbonate substrate by spin coating. Next, the applied polydiacetylene solution (thickness: 1 / im) is exposed to ultraviolet rays for one hour while the substrate is heated to 60 ° C., thereby curing the UV. As a result, a polydiacetylene layer is formed on the substrate (sample disk 2a). Polydiacetylene has three phases: red phase, blue phase, and colorless phase. The polydiacetylene layer obtained by this method has a blue phase.
- sample disks 2b and 2c are prepared.
- the polydiacetylene layer changes to a red phase, a blue phase, and a colorless phase as the UV curing time increases. Therefore, after applying the polydiacetylene solution in the same manner as described above, UV curing is performed for a time shorter than 1 hour.
- a sample disk 2b composed of red-phase borodiacetylene is obtained.
- a sample disk 3c made of a colorless polydiacetylene can be obtained.
- FIG. 5 shows the measurement results of the spectral characteristics of the sample disk 2a.
- the recording layer 57 made of polydiacetylene has very good transmission characteristics with respect to light having a wavelength of 800 nm and light having a wavelength of 400 nm. This layer is amorphous and does not scatter these lights.
- Sample disk 2a Peak output: 600 mw, output pulse width: 5 nanoseconds pulsed laser light emitted from semiconductor laser: 800 nm, NA: 0.85 objective
- the sample disk 2a has high sensitivity, recording can be performed on the sample disk 2a using a conventional semiconductor laser.
- the sample disk 2b (red phase) was transparent to light having a wavelength of 800 nm and light having a wavelength of 400 nm.
- Disk 2c (achromatic) is completely transparent to light in the entire wavelength range of 900 nm to 400 nm.
- Sample disk 2c laser beam of wavelength: 800 nm emitted from pulsed semiconductor laser with peak output: 800 mw, pulse width: 5 nanoseconds, NA: 0.85 objective lens
- a good signal pit can be recorded on the sample disk 2c.
- a colorless polydiacetylene film was considered to be a deteriorated film in which chemical bonds were broken by ultraviolet rays.
- the use of a recording layer composed of a colorless polydiacetylene enables highly sensitive multiphoton absorption recording.
- the optical information recording carrier of the present embodiment may have a plurality of recording layers 57 as shown in FIG. 1, as in the first embodiment.
- FIG. 1 is a schematic diagram showing a configuration of an optical information recording carrier 100 of the present embodiment.
- the optical information recording carrier 100 includes a substrate 56 and a laminate 49 formed on the substrate 56.
- the substrate 56 is made of, for example, polycarbonate.
- the laminate 49 includes a recording layer 57 (thickness: for example, 0.25 / 2 m).
- the recording layer 57 contains merocyanine (thermal conductivity: 0.08 to 0.2 WZm ⁇ K) or polydiacetylene (thermal conductivity: 0.8 to 0.2 W / m-K). It is formed from materials. Further, since the recording layer 57 is amorphous, it is transparent to the reproduction light and the recording light. In this embodiment, ten recording layers 57 are provided (three recording layers 57 are shown in FIG. 1 for simplicity).
- the number of the recording layers 57 is not particularly limited, and at least one recording layer may be used. In order to improve the recording density, the number of the recording layers 57 can be 5 or more. This is because the recording layer 57 is transparent to the recording light and the reproduction light, so that the above-described problem of light attenuation does not occur. More preferably, the number of the recording layers 57 is set to 10 or more. When a plurality of recording layers 57 are used in this way, a separation layer (thickness: for example, about 10 m) 53 made of, for example, a UV curable resin is provided between adjacent recording layers 57 so as to be separated from each other. Is preferred.
- a protective film 50 for protecting the recording layer 57 is formed on the uppermost portion of the laminate 49.
- the protective film 50 is, for example, a sheet (thickness: about 100 m, for example) of a poly-polyponate.
- the recording light (wavelength: 800 nm) 5 emitted from a light source or the like is The light is focused on one recording layer 57 to be recorded among the plurality of recording layers 57.
- the condensed portion (near the focal point) 3 of the recording layer 57 generates heat due to multiphoton absorption, and is locally deformed by the heat. As a result, a pit is formed near the focal point 3.
- Multilayer recording can be performed by sequentially focusing and recording each of the plurality of recording layers 57.
- a parallel light beam 5 of reproduction light (wavelength: 400 nm) emitted from a light source or the like is passed through the objective lens 1.
- the light is focused on the recording layer 57 to be reproduced, and the reflected light is detected.
- information can be read from the pit formed on the recording layer 57.
- the recording layer 57 of the optical information recording carrier 100 is formed from a material containing merocyanine or polydiacetylene, the recording sensitivity of the optical information recording carrier 100 is reduced as described in the first embodiment. Can be improved. Further, as shown in FIG. 1, the optical information recording carrier 100 has a structure in which the recording layers 57 having a relatively small thickness are stacked, so that the recording layers 57 can be easily manufactured. Such a structure is particularly advantageous when it is difficult to form a recording layer 57 having a large thickness as shown in FIG. 8 using a material containing merocyanine or polydiacetylene, for example.
- the sample multilayer disc 3 of the information recording carrier 100 is produced, for example, by the following method.
- a merocyanine solution is applied on a substrate (polycarbonate resin substrate) 56 by the same method as that described in the first embodiment.
- a recording layer (thickness: for example, 0.25 lim) 57 of the merocyanine-based compound is formed.
- the solution containing the UV curable resin is After applying the solution to about 10 m, the applied solution is irradiated with ultraviolet rays to cure the UV-curable resin, and the separation layer 53 (thermal conductivity: 0.08 WZm ⁇ K or more, 0.3 W or more) / m ⁇ K or less).
- a recording layer (thickness: 0.25 ⁇ m) 57 of a merocyanine compound is formed again.
- the recording layer 57 is formed into about 10 layers.
- a protective film 50 is provided by attaching a poly-ion sheet having a thickness of about 100 m.
- a sample multilayer disc 3 is obtained.
- the thickness (0.25 // m) of the recording layer 57 is about 1/2 of the wavelength ⁇ w of the recording light, and the reflected light from the upper surface and the lower surface of the recording layer 57 is The two beams cancel each other out, and almost no reflected light of the recording light by the recording layer 57 is observed.
- the recording layer 5 7 pit is formed, the semiconductor laser wavelength is emitted from the ⁇ r:. 4 0 0 nm of the parallel light beam 5 is condensed by the objective lens 1 for detecting the reflected light.
- the thickness of the recording layer 57 is substantially equal to the wavelength ⁇ f of the reproduction light, the reflected light from the upper surface and the lower surface of the recording layer 57 is emphasized, and the maximum reflected light is obtained. Therefore, the pits of the recording layer 57 (heat The change in the reflected light at the part where distortion or perforation is formed is the largest. At this time, the maximum modulation rate of the signal is obtained.
- the recording layer 57 may be formed from the inorganic materials exemplified in Embodiment 1 (tellurium oxide (tellurium dioxide), zinc oxide, zinc sulfide, and the like).
- the recording / reproducing apparatus shown in FIG. 6 includes a semiconductor laser 11 that emits a linearly polarized light beam, a collimator lens 10 that converges a light beam from the semiconductor laser 14 into parallel light, and a collimator lens 10. It is equipped with a polarizing beam splitter 7 for splitting a light beam from the camera into two lights, a focus detection lens 8, a signal detection photodetector 9, a ⁇ / 4 wavelength plate 4, a rising mirror 6, and an objective lens 1. One of the lights split by the polarization beam splitter 17 passes through the focus detection lens and enters the signal detection photodetector 9.
- the other of the split light passes through the polarizing beam splitter 7 as it is, passes through a ⁇ ⁇ 4 wave plate, changes its optical path by a start-up mirror 6, and thereafter, an optical information recording carrier by an objective lens 1.
- the light is focused on the recording layer 57 of 100. If the light emitted from the semiconductor laser 11 is recording light (wavelength: 800 nm, for example), thermal deformation occurs at the converged point 3 of the recording layer 57, and a pit is formed.
- the semiconductor laser 11 If the emitted light is reproduction light (wavelength: for example, 400 nm), the reproduction light is reflected by the recording layer 57, and the reflected light is transmitted to the polarizing beam splitter 7 by the objective lens 1 and the starting mirror 16. Is returned to. Thereafter, the reflected light changes its optical path by a polarizing beam splitter 7, is focused by a focus detection lens 8 on a signal detection photodetector 9, and is detected by a signal detection photodetector 9.
- This embodiment is different from the configuration shown in FIG. 1 in that a thermoplastic resin layer having a low heat distortion temperature is arranged so as to be in contact with each of the plurality of recording layers 57.
- a thermoplastic resin layer having a low heat distortion temperature is arranged so as to be in contact with each of the plurality of recording layers 57.
- a pit can be easily formed on the recording layer 57 by thermal deformation. Therefore, a high recording / reproducing density can be obtained even when, for example, an inorganic compound having a high thermal conductivity and being not easily thermally deformed is used as a material of the recording layer 57.
- a specific configuration of the optical information recording carrier of the present embodiment will be described below.
- the optical information recording carrier 101 shown in FIG. 2 has a substrate 56 and a laminated body 49 formed on the substrate.
- the laminate 49 has a plurality of recording layers 57 and a separation layer 53 for separating adjacent recording layers 57.
- Each of the plurality of recording layers 57 is sandwiched between thermoplastic resin layers 52.
- the thermoplastic resin layer 52 may be arranged so as to surround each of the recording layers 57.
- the recording layer 57 is an amorphous layer formed of, for example, a tellurium oxide compound.
- the material of the recording layer 57 is not particularly limited, but it is preferable that the recording layer 57 be substantially transparent.
- the thermoplastic resin layer 52 is a resin having thermoplasticity and a low heat distortion temperature.
- the laminated body 49 may have at least one recording layer 57, but preferably has two or more recording layers 57 from the viewpoint of recording density.
- Each of the recording layers 57 of the optical information recording carrier 101 can be recorded or reproduced by the same method as described with reference to FIG.
- the recording layer 57 for example, an inorganic oxide, an inorganic sulfide, or the like can be used.
- Preferred inorganic oxides and sulfides are, for example, tellurium oxide, zinc oxide and zinc sulfide. These inorganic materials are advantageous because the third-order nonlinear constant is relatively large.
- the recording layer 57 is preferably an amorphous layer of these inorganic materials. Since such an amorphous layer has translucency, absorption of light other than multiphoton absorption hardly occurs, and excellent recording can be performed. Also, when performing multi-layer recording, a high recording density can be obtained because the number of layers can be increased.
- tellurium oxide when used as the inorganic oxide, it is difficult to vitrify (amorphize) with tellurium oxide alone. When added in an amount of 10% by weight or more, the glassy range of tellurium oxide can be expanded, so that an amorphous layer can be easily formed.
- the range of vitrification when various additives are added to tellurium oxide is described in "T e 1 lurite Glasses H andbook, Raouf AH E l -M all aw anyp 2 0—22 describes in detail.
- thermoplastic resin layer 52 is disposed on both sides (or around) of the recording layer 57, the portion of the recording layer 57 where multiphoton absorption occurs (near the focal point) The heat generated in 3 distorts the recording layer 57 and also distorts the thermoplastic resin layers 52 on both sides (or around). In this way, the pits can be formed more reliably by the heat of multiphoton absorption, and the recording sensitivity can be further improved.
- an inorganic material tellurium oxide, zinc oxide, zinc sulfide, etc.
- the recording layer 57 has good thermal conductivity. Can be greatly improved.
- thermoplastic resin layer 52 is in contact with the corresponding recording layer 57.
- the heat generated in the recording layer 57 is efficiently transmitted to the thermoplastic resin layer 52, so that the recording sensitivity can be improved more effectively.
- the optical information recording carrier 101 is manufactured by, for example, the following method. Is done.
- a separating layer (thickness :, for example, 5 to; L 0 m, thermal conductivity: 0.08 W / m ⁇ K or more and 0.3 W / m ⁇ K or less)
- the separation layer 53 can be formed using a UV curable resin.
- the separation layer 53 can be formed by using a known coating method such as a spin coating method.
- thermoplastic resin layer 52 (thickness: for example, 0.5 to 5 zm) made of polystyrene is formed.
- the formation of the thermoplastic resin layer 52 can be performed, for example, by a spin coating method.
- a recording layer 57 (thickness: for example, 0.05 to 1 / im) is formed on the thermoplastic resin layer 52. It is formed by a pinner method or an evaporation method.
- a tellurium oxide compound obtained by adding lithium or Na as an additional element to tellurium oxide is used as the material of the recording layer 57.
- the method for adding the additional element to tellurium oxide is not particularly limited. For example, after tellurium oxide is added to sodium carbonate and mixed, the mixture is melted. As a result, the carbonic acid contained in the sodium carbonate is gasified and diffuses into the air, so that only Na can be added to tellurium oxide.
- the addition amount is preferably from 10% by weight to 30% by weight.
- thermoplastic resin layer 52 is further formed by the same method.
- the thermoplastic resin layer 52, the recording layer 57, and the thermoplastic resin layer 52 are sequentially formed again.
- a protective film 50 is provided by attaching a poly-polycarbonate sheet having a thickness of about 100 m so as to cover the uppermost thermoplastic resin layer 52. Thereby, the optical information recording carrier 101 is obtained.
- a sample disk 4 having a structure in which a lithium-doped tellurium oxide layer (thickness: 0.25 ⁇ m) was formed on a polycarbonate substrate was used.
- a comparative disk having a silica glass layer (thickness: 0.25 xm) formed on a polycarbonate substrate was also manufactured.
- “recording sensitivity (or sensitivity)” refers to the light focused on the recording layer in order to form a pit of a predetermined shape on the recording layer when the NA of the objective lens is fixed. The comparison is based on the strength of That is, the smaller the light intensity required to form a pit having a predetermined shape, the higher the recording sensitivity.
- the recording sensitivities of the recording layers of the above two sample disks can be specifically compared by the following method.
- the light intensity of the tellurium oxide layer of sample disk 4 was 10 nJ, while the light intensity of the silica glass layer of the comparative disk was 20 OnJ, and the recording sensitivity of the tellurium oxide recording layer was Has been confirmed to be one order of magnitude higher than the recording sensitivity of the conventional recording layer.
- thermoplastic resin layers 52 are arranged on both sides of the recording layer (thickness: 0.05 to 1 ⁇ ) 57, for example. Is not limited to this.
- a thermoplastic resin layer (thickness: for example, 2 im) 52 may be provided only on the upper surface or the lower surface of the recording layer 57.
- a heat insulation layer (or heat insulation layer) 58 of titanium oxide or the like may be provided on the other surface of the recording layer 57.
- a heat insulation layer 58 of titanium oxide or the like may be provided on the other surface of the recording layer 57.
- the heat insulating layer 58 it has a high thermal deformation temperature such as titanium oxide and is hard ( Inorganic materials and organic materials such as high-hardness thermosetting resins and UV-curing resins can be used.
- the thermal conductivity of the heat insulating layer 58 is, for example, not less than 0.08 W_ / m'K and not more than 0.3 W / m ⁇ K.
- the thickness of the heat insulating layer 58 is, for example, about 0.5 to 3 m.
- the heat insulating layer 58 When the heat insulating layer 58 is provided so as to be in contact with one surface of the recording layer 57, the heat generated in the recording layer 57 is not transmitted to the heat insulating layer 58 by the heat and the distortion force due to the heat. In this way, by controlling the transfer of heat generated in the recording layer 57, a desired pit shape can be obtained while maintaining a high temperature rise rate in a portion of the recording layer 57 where a pit is desired to be formed. .
- the heat insulating layer 58 is lined with the separation layer 53 used in the optical information recording carrier of FIG. 3, it is preferable to use a hard UV cured resin or the like that is hardly deformed by heat as a material of the separation layer 53.
- the thickness of the separation layer 53 is, for example, about 5 to 10 m.
- the thermoplastic resin layer 52 may be provided on both sides of the recording layer 57 as shown in FIG. 2, or may be provided only on one side as shown in FIG.
- a preferred material of the thermoplastic resin layer 52 in contact with the recording layer 57 is a resin such as styrene, polystyrene, or polyurethane that is easily deformed by heat ( therefore, together with the heat generation of the recording layer 57, the thermoplastic resin layer 5 2 easily deforms locally, so signals can be recorded as film deformation.
- thermoplastic resin layer 52 is suitably used for an optical information recording carrier having a recording layer having a high heat distortion temperature.
- a recording layer is not limited to a recording layer made of the above-mentioned inorganic compound, and may be used in other embodiments of the present invention such as a known inorganic material and an organic material, and melosyanin. It may be a recording layer made of a material.
- a thermoplastic resin layer 52 is formed on the surface of the recording layer 57.
- the heat insulating layer 58 By appropriately arranging the heat insulating layer 58, it is possible to easily form a pit due to the heat generated in the recording layer 57, and to suppress the expansion of the heat generated in the recording layer 57. That is, the characteristics of the recording layer 57 can be appropriately corrected. Therefore, the range of selection of the material of the recording layer 57 is widened.
- a large third-order nonlinear constant as a material of the recording layer 5-7 (preferably 0. 5 X 1 0- 12 esu or more) can be freely selected material.
- Suitable materials for the recording layer 5-7 if example embodiment, tellurium oxide (tellurium dioxide) (third-order nonlinear constant: 1.
- X 1 0- 12 esu zinc oxide
- third-order nonlinear constant 0. 8 X 1 0-1 12 esu
- These oxidized compounds may be materials to which lithium (Li), sodium (Na) and the like are appropriately added. Specifically, for example, a compound containing 75 TeO 2 and lithium 25 (a compound composed of 75% tellurium oxide and 25% tellurium oxide in mole percent; hereinafter abbreviated as “lithium-doped tellurium oxide”) May be used).
- Third-order nonlinear constant of this compound (1.
- the recording sensitivity of the recording layer of the Li-added tellurium oxide is N in a configuration in which the thermoplastic resin layer 52 is not provided (for example, FIG. 1). Recording layer of a-doped tellurium oxide Lower than the recording sensitivity.
- the recording sensitivity of the optical information recording medium including the recording layer of Li-added tellurium oxide becomes Na-added. Improves the recording sensitivity to about twice the recording sensitivity of the optical information recording device #: including the tellurium oxide recording layer.
- the thermoplastic resin layer 52 has an effect of compensating that the recording layer of Li-added tellurium oxide is hard and has poor adhesion to other layers.
- the material of the recording layer a material having a low heat distortion temperature, a small thermal conductivity, and a high heat generation efficiency (a large third-order nonlinear constant) is used.
- a physical spot can be formed on the recording layer. Therefore, the recording / reproducing sensitivity can be improved. Further, the recording density can be improved by performing multi-layer recording.
- thermoplastic resin layer is disposed on the upper surface, the upper surface, or the lower surface of the recording layer, it is easy to form a physical spot on the recording layer using multiphoton absorption. Therefore, the range of choice of the material of the recording layer is expanded. It is particularly advantageous to select a material having a large third-order nonlinear constant as the material of the recording layer.
- an optical information recording carrier having high recording / reproducing sensitivity can be provided. Also, a method and apparatus for recording / reproducing information on such an optical information recording carrier can be provided. Performing multi-layer recording using this optical information recording carrier is advantageous because the recording density can be improved.
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Abstract
Description
Claims
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Publication number | Priority date | Publication date | Assignee | Title |
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Citations (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3971874A (en) * | 1973-08-29 | 1976-07-27 | Matsushita Electric Industrial Co., Ltd. | Optical information storage material and method of making it |
JPS58163695A (ja) * | 1982-03-24 | 1983-09-28 | Agency Of Ind Science & Technol | 感熱記録材料及びその記録方法 |
JPS5982342U (ja) * | 1982-11-22 | 1984-06-04 | 沖電気工業株式会社 | 光記録用媒体 |
US4460665A (en) * | 1981-12-28 | 1984-07-17 | Ricoh Co., Ltd. | Optical information recording medium |
EP0130755A2 (en) * | 1983-06-27 | 1985-01-09 | Matsushita Electric Industrial Co., Ltd. | Method of producing optical recording medium |
EP0142968A2 (en) * | 1983-11-15 | 1985-05-29 | Matsushita Electric Industrial Co., Ltd. | Optical recording medium and method of producing same |
JPS60127242A (ja) * | 1983-12-09 | 1985-07-06 | Res Dev Corp Of Japan | 鉄−鉛系非晶質化合物材料及びその製造法 |
JPS61138236A (ja) * | 1984-12-10 | 1986-06-25 | Agency Of Ind Science & Technol | 表示素子 |
EP0188100A2 (en) * | 1984-12-13 | 1986-07-23 | Kuraray Co., Ltd. | Optical recording medium formed of chalcogen oxide and method for producing same |
JPS61203448A (ja) * | 1985-03-05 | 1986-09-09 | Mitsubishi Petrochem Co Ltd | 光記録媒体 |
EP0243958A2 (en) * | 1986-04-30 | 1987-11-04 | Nec Corporation | Optical information recording medium |
JPS62256243A (ja) * | 1986-01-20 | 1987-11-07 | Victor Co Of Japan Ltd | 情報記録媒体 |
JPH01115685A (ja) * | 1987-10-29 | 1989-05-08 | Toray Ind Inc | 光記録媒体 |
JPH01159840A (ja) * | 1987-12-17 | 1989-06-22 | Matsushita Electric Ind Co Ltd | 光ディスク |
JPH0296942A (ja) * | 1988-10-02 | 1990-04-09 | Taiyo Yuden Co Ltd | 書き換え可能な光情報記録媒体 |
JPH0335428A (ja) * | 1989-06-30 | 1991-02-15 | Toshiba Corp | 情報記録装置 |
JPH0369041A (ja) * | 1989-08-09 | 1991-03-25 | Hitachi Ltd | 光学的記録再生方法 |
US5272667A (en) * | 1989-12-29 | 1993-12-21 | Matsushita Electric Industrial Co., Ltd. | Optical information recording apparatus for recording optical information in a phase change type optical recording medium and method therefor |
JP2000118135A (ja) * | 1998-10-09 | 2000-04-25 | Ricoh Co Ltd | 相変化形光記録媒体 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4614705A (en) * | 1984-02-17 | 1986-09-30 | Ricoh Co., Ltd. | Optical information recording medium |
US4678736A (en) * | 1985-03-05 | 1987-07-07 | Mitsubishi Petrochemical Co., Ltd. | Optical recording media on which information is stored and method of making same |
JPH02155689A (ja) * | 1988-12-08 | 1990-06-14 | Olympus Optical Co Ltd | 光記録方式 |
US5449590A (en) * | 1991-06-04 | 1995-09-12 | International Business Machines Corporation | Multiple data surface optical data storage system |
US5559784A (en) * | 1993-03-26 | 1996-09-24 | Fuji Xerox Co., Ltd. | Multi-layer optical information detection by two laser beam and optical multilayer recording medium |
-
2003
- 2003-09-02 WO PCT/JP2003/011220 patent/WO2004030919A1/ja active Application Filing
- 2003-09-02 JP JP2004541217A patent/JPWO2004030919A1/ja active Pending
- 2003-09-02 US US10/527,018 patent/US20060072438A1/en not_active Abandoned
Patent Citations (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3971874A (en) * | 1973-08-29 | 1976-07-27 | Matsushita Electric Industrial Co., Ltd. | Optical information storage material and method of making it |
US4460665A (en) * | 1981-12-28 | 1984-07-17 | Ricoh Co., Ltd. | Optical information recording medium |
JPS58163695A (ja) * | 1982-03-24 | 1983-09-28 | Agency Of Ind Science & Technol | 感熱記録材料及びその記録方法 |
JPS5982342U (ja) * | 1982-11-22 | 1984-06-04 | 沖電気工業株式会社 | 光記録用媒体 |
EP0130755A2 (en) * | 1983-06-27 | 1985-01-09 | Matsushita Electric Industrial Co., Ltd. | Method of producing optical recording medium |
EP0142968A2 (en) * | 1983-11-15 | 1985-05-29 | Matsushita Electric Industrial Co., Ltd. | Optical recording medium and method of producing same |
JPS60127242A (ja) * | 1983-12-09 | 1985-07-06 | Res Dev Corp Of Japan | 鉄−鉛系非晶質化合物材料及びその製造法 |
JPS61138236A (ja) * | 1984-12-10 | 1986-06-25 | Agency Of Ind Science & Technol | 表示素子 |
EP0188100A2 (en) * | 1984-12-13 | 1986-07-23 | Kuraray Co., Ltd. | Optical recording medium formed of chalcogen oxide and method for producing same |
JPS61203448A (ja) * | 1985-03-05 | 1986-09-09 | Mitsubishi Petrochem Co Ltd | 光記録媒体 |
JPS62256243A (ja) * | 1986-01-20 | 1987-11-07 | Victor Co Of Japan Ltd | 情報記録媒体 |
EP0243958A2 (en) * | 1986-04-30 | 1987-11-04 | Nec Corporation | Optical information recording medium |
JPH01115685A (ja) * | 1987-10-29 | 1989-05-08 | Toray Ind Inc | 光記録媒体 |
JPH01159840A (ja) * | 1987-12-17 | 1989-06-22 | Matsushita Electric Ind Co Ltd | 光ディスク |
JPH0296942A (ja) * | 1988-10-02 | 1990-04-09 | Taiyo Yuden Co Ltd | 書き換え可能な光情報記録媒体 |
JPH0335428A (ja) * | 1989-06-30 | 1991-02-15 | Toshiba Corp | 情報記録装置 |
JPH0369041A (ja) * | 1989-08-09 | 1991-03-25 | Hitachi Ltd | 光学的記録再生方法 |
US5272667A (en) * | 1989-12-29 | 1993-12-21 | Matsushita Electric Industrial Co., Ltd. | Optical information recording apparatus for recording optical information in a phase change type optical recording medium and method therefor |
JP2000118135A (ja) * | 1998-10-09 | 2000-04-25 | Ricoh Co Ltd | 相変化形光記録媒体 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006057181A1 (ja) * | 2004-11-24 | 2006-06-01 | Matsushita Electric Industrial Co., Ltd. | 光情報記録担体 |
WO2007060674A2 (en) * | 2005-11-28 | 2007-05-31 | Mempile Inc. | Multi-layer three dimensional non-linear optical data carrier and method of recording/reading data therein |
WO2007060674A3 (en) * | 2005-11-28 | 2007-07-05 | Mempile Inc | Multi-layer three dimensional non-linear optical data carrier and method of recording/reading data therein |
WO2009139479A1 (ja) * | 2008-05-12 | 2009-11-19 | ソニー株式会社 | 光情報記録媒体及び2光子吸収材料 |
JP2009277271A (ja) * | 2008-05-13 | 2009-11-26 | Fujifilm Corp | 光記録媒体の記録方法、光記録媒体、情報が記録された記録媒体の製造方法および光記録媒体の記録装置 |
Also Published As
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JPWO2004030919A1 (ja) | 2006-02-02 |
US20060072438A1 (en) | 2006-04-06 |
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