WO2010116945A1 - Support d'enregistrement d'informations optique à multiples couches - Google Patents

Support d'enregistrement d'informations optique à multiples couches Download PDF

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Publication number
WO2010116945A1
WO2010116945A1 PCT/JP2010/056000 JP2010056000W WO2010116945A1 WO 2010116945 A1 WO2010116945 A1 WO 2010116945A1 JP 2010056000 W JP2010056000 W JP 2010056000W WO 2010116945 A1 WO2010116945 A1 WO 2010116945A1
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Prior art keywords
layer
information recording
intermediate layer
recording medium
substrate
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PCT/JP2010/056000
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English (en)
Japanese (ja)
Inventor
圭介 米田
真一 小城
淳 赤羽
将志 服部
宏樹 石原
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太陽誘電株式会社
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Publication of WO2010116945A1 publication Critical patent/WO2010116945A1/fr

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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
    • 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
    • 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
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • G11B7/263—Preparing and using a stamper, e.g. pressing or injection molding substrates
    • 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
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • G11B7/266—Sputtering or spin-coating layers
    • 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
    • G11B7/2467—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 azo-dyes
    • 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
    • G11B7/2472—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 cyanine
    • 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
    • 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
    • G11B7/2532—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 metals
    • 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

Definitions

  • the present invention relates to a multilayer optical information recording medium having a plurality of information recording layers.
  • an optical information recording medium such as an optical disk has become widespread.
  • an optical information recording medium there is one in which an information recording layer is formed on a light-transmitting resin substrate having a thickness of 1.2 mm and a diameter of 120 mm or 80 mm, such as a compact disc (CD).
  • a compact disc CD
  • an optical information recording medium such as a DVD using an objective lens having a short laser wavelength and a large numerical aperture (NA) has been realized.
  • This DVD has a structure in which two light-transmissive resin substrates having a thickness of 0.6 mm are bonded together and an information recording layer is sandwiched between the substrates.
  • BD Blu-ray Disc is a registered trademark.
  • This BD has a structure in which an information recording layer is formed on the light incident surface side of a resin substrate having a thickness of 1.1 mm, and a light transmission layer having a thickness of 0.1 mm is provided on the surface on which the information recording layer is formed. have.
  • optical discs include write-once type optical discs.
  • a reflective layer formed on pits arranged in a spiral or concentric pattern on a substrate serves as an information recording layer.
  • an information recording layer is composed of a light absorption layer and a reflection layer formed on a guide groove arranged in a spiral or concentric pattern on a substrate.
  • organic dyes such as cyanine dyes and azo dyes, and inorganic materials such as Si, Cu, Sb, Te, and Ge are used.
  • data is recorded by irradiating a light-absorbing layer on the guide groove with a recording laser beam to form pits.
  • BD is standardized so that a recording capacity of 100 gigabytes can be realized with a maximum of four information recording layers.
  • a light-transmitting intermediate layer having a thickness of 25 ⁇ m is provided on a first information recording layer formed on a 1.1 mm-thick substrate, and a second information recording layer is provided thereon.
  • a light transmission layer is formed.
  • the thickness of the light transmission layer is 75 ⁇ m when the recording layer is two layers, 50 ⁇ m when the recording layer is three layers, and 25 ⁇ m when the recording layer is four layers.
  • Such a multilayer optical disc is formed by the following process as disclosed in, for example, Japanese Patent Application Laid-Open No. 2007-048367.
  • a substrate 2 on which a first information recording layer is formed is prepared. This substrate is formed by a single-layer optical disc manufacturing process.
  • a resin or metal stamper having a protrusion for forming a spiral or concentric guide groove is prepared, and light is applied to the surface of the stamper having a protrusion by spin coating or the like.
  • a transparent curable resin is applied and cured to form the intermediate layer 5.
  • an adhesive layer such as an ultraviolet curable adhesive is formed on the intermediate layer 5 and the first information recording layer 3 of the previously prepared substrate 2 by spin coating or the like.
  • 4a and an adhesive layer 4b are formed and bonded together.
  • the stamper is peeled off as shown in FIG.
  • a second information recording layer is formed on the intermediate layer 5, and then a light-transmitting curable resin is applied by spin coating or the like, or a light-transmitting curable resin is applied.
  • seat is affixed and a light transmissive layer is formed.
  • a photopolymer method hereinafter referred to as 2P method. *
  • Such a 2P method is costly in that it requires a stamper for forming the intermediate layer and requires a stamper peeling process, but a multilayer optical disk having good recording characteristics can be obtained. For this reason, the 2P method is preferably used for manufacturing a multilayer optical disk.
  • the adhesive 4 b is applied without peeling the stamper from the intermediate layer 5 as shown in FIG. 15.
  • meandering may occur on the inner peripheral edge side (left side in FIG. 15) of the intermediate layer due to variations in the application of the adhesive. This meandering may impair the appearance of the product.
  • the adhesive 4 b may be applied so as to protrude beyond the edge of the intermediate layer 5. If the adhesive 4b is cured in this state, the stamper is adhered and is difficult to peel off. As a result, a large stress is applied when the stamper is peeled off, and the intermediate layer 5 is often cracked or chipped. *
  • the adhesive layer 4 has a role of adjusting the thickness
  • the combined thickness of the intermediate layer 5 and the adhesive layer 4 becomes a predetermined thickness. Paste together.
  • excess adhesive may protrude from the inner peripheral edge of the intermediate layer 5.
  • the stamper is adhered and is difficult to peel off.
  • the intermediate layer 5 may be cracked or chipped as shown in FIG.
  • the protruding adhesive causes meandering at the inner peripheral edge of the intermediate layer 5, and this meandering may impair the appearance of the product.
  • a disk-shaped substrate having concave portions arranged in a spiral or concentric shape on one surface, a first information recording layer formed on one surface of the substrate, and the first information
  • An intermediate layer formed on one surface with concave portions formed on the recording layer and arranged in a spiral or concentric circle; and a second information recording layer formed on one surface of the intermediate layer
  • a multilayer optical information recording medium is proposed in which concentric grooves are formed continuously or intermittently in the vicinity of the inner periphery of the intermediate layer.
  • the concentric grooves prevent the adhesive from protruding, deterioration of the appearance of the product can be reduced. Moreover, since it can suppress that a stamper adhere
  • a radius of 10.5 to 12.5 mm from the center of the multilayer optical information recording medium is a suitable range.
  • a position having a radius of 10.5 mm from the center of the multilayer optical information recording medium corresponds to the inner peripheral edge of the intermediate layer. That is, it is preferable that concentric grooves are formed within a range of 2.0 mm from the inner peripheral edge of the intermediate layer toward the outer periphery.
  • FIG. 1 is a plan view schematically showing a multilayer optical information recording medium of the present invention.
  • FIG. 2 is a diagram schematically showing a cross section taken along the line AA of FIG. 1 and showing the first embodiment of the present invention. It is a figure which shows the manufacturing process of the multilayer type
  • FIG. 1 It is a figure which shows the manufacturing process of the multilayer type
  • FIG. 3 is a diagram schematically showing a cross section taken along line AA of FIG. 1, and is a diagram showing a second embodiment of the present invention.
  • FIG. 6 is a diagram schematically showing a cross section taken along line AA in FIG. 1, and showing a third embodiment of the present invention.
  • mold optical information recording medium It is a figure which shows the manufacturing process of the conventional multilayer type
  • mold optical information recording medium It is a figure which shows the problem of the conventional multilayer type
  • FIG. 1 is a plan view of a multilayer optical disc according to the present invention
  • FIG. 2 is a partial cross-sectional view taken along the line AA in FIG.
  • Concentric grooves 7 are intermittently formed in the vicinity of the inner peripheral edge of the intermediate layer 5.
  • the vicinity of the inner peripheral edge of the intermediate layer 5 is a range in which the effect of the present invention is exerted in the clamping area, from the inner peripheral edge of the intermediate layer located at a radius of 10.5 mm from the center of the disk to the outer periphery.
  • a range of 2.0 mm toward the disk, that is, a radius of 10.5 mm to 12.5 mm from the center of the disk is particularly preferable.
  • the multilayer optical disc 1 'in FIG. 2 has the following configuration.
  • a spiral or concentric guide groove GV1 is provided with a disk-shaped substrate 2 formed on one surface.
  • a first information recording layer 3 is formed on one surface of the substrate 2.
  • an intermediate layer 5 having a spiral or concentric guide groove GV2 on one surface is formed via an adhesive layer 4.
  • a second information recording layer 6 is formed on the intermediate layer 5.
  • a light transmission layer 8 is formed on the second information recording layer 6.
  • the first information recording layer 3 includes a reflective layer 3a formed on one surface of the substrate 2, a light absorbing layer 3b formed on the reflective layer 3a, and a protective layer formed on the light absorbing layer 3b. 3c.
  • the second information recording layer 3 includes a reflective layer 6a formed on the intermediate layer 5, a light absorbing layer 6b formed on the reflective layer 6a, and a protective layer 6c formed on the light absorbing layer 6b. And is composed of.
  • a concentric groove 7 is formed near the inner periphery of the intermediate layer 5.
  • the substrate 2 is a disc-shaped substrate having a thickness of 1.1 mm and a diameter of 120 mm.
  • Various materials used as the substrate material of the conventional optical disc can be arbitrarily selected and used for the substrate 2.
  • Specific examples include acrylic resins such as polycarbonate and polymethyl methacrylate, vinyl chloride resins such as polyvinyl chloride and vinyl chloride copolymers, epoxy resins, amorphous polyolefins, polyester resins, metals such as aluminum, and glass. If necessary, these may be used in combination or by a method such as mixing.
  • a thermoplastic resin is preferable from the viewpoint of moldability, moisture resistance, dimensional stability, and low price, and polycarbonate is particularly preferable.
  • Such a substrate 2 is formed by injection molding.
  • a stamper is set in the mold, whereby a spiral or concentric guide groove GV1 is formed in the substrate 2.
  • the guide groove GV1 is formed with a pitch of 0.32 ⁇ m to 0.35 ⁇ m, and pits are formed in the guide groove GV1.
  • the reflective layer 3a of the first information recording layer 3 is formed of a metal thin film having a high reflectance such as an Ag alloy or an Al alloy, and is formed by sputtering or the like. Since the reflection layer 3a may totally reflect the incident light, the thickness is preferably 55 nm to 65 nm.
  • the light absorption layer 3b includes one using an organic dye and one using an inorganic material. In the case of the light absorption layer 3b using an organic dye, it is formed by applying a solution obtained by dissolving an organic dye such as a cyanine dye or an azo dye in a solvent such as TFP by a spin coating method.
  • the dye used for the light absorption layer 3b has a characteristic of being decomposed by absorbing laser light having a wavelength of 405 nm.
  • an inorganic material for example, a phase change type such as Te—Pd, an alloy type in which a Si film and a Cu alloy film are laminated, or a decomposition reaction in which Bi—N and Ge—N are mixed. A type is mentioned.
  • These inorganic material-based light absorption layers 3b are formed by sputtering.
  • the protective layer 3c is a solvent of a curable resin that becomes the intermediate layer 5 and the diffusion of the dye contained in the light absorption layer 3b when the intermediate layer 5 is formed. This is to prevent a mixing phenomenon such as penetration into the light absorption layer 3b.
  • the material constituting the protective layer 3c is silicon oxide, particularly silicon dioxide, oxides such as zinc oxide, cerium oxide, yttrium oxide; sulfides such as zinc sulfide and yttrium sulfide; nitrides such as silicon nitride; silicon carbide; Examples thereof include a mixture of an oxide and a sulfur compound.
  • the same layer as the protective layer 3c is formed as a dielectric film for improving light absorption.
  • the protective layer 3c is formed by a method such as sputtering.
  • the reflective layer 3a, the light absorbing layer 3b, and the protective layer 3c constitute the first information recording layer 3.
  • the intermediate layer 5 is formed by a method in which a liquid curable resin is applied on a resinous or metallic stamper by a spin coating method or the like and cured, and is bonded to the substrate 2 via the adhesive layer 4.
  • a liquid curable resin for example, an ultraviolet curable resin such as trade name: SD-694 (manufactured by DIC Corporation) is suitably used.
  • spiral or concentric guide grooves GV2 are formed with a pitch of 0.32 ⁇ m to 0.35 ⁇ m.
  • the reflective layer 6a of the second information recording layer 6 is formed of a metal thin film having high reflectivity such as Ag alloy or Al alloy, and is formed by sputtering or the like. Since the reflective layer 6a of the second information recording layer 6 may reflect or transmit incident light, it needs to be semi-transmissive. Therefore, a metal film that is thinner than the reflective layer 3a of the first information recording layer 3 is preferable, and preferably 20 nm to 30 nm.
  • the light absorption layer 6b and the protective layer 6c are substantially the same as the light absorption layer 3b and the protective layer 3c of the first information recording layer 3.
  • the semi-transmissive reflective layer 6a, the light absorbing layer 6b, and the protective layer 6c constitute a second information recording layer 6.
  • the light transmissive layer 8 is formed of a light transmissive resin.
  • a curable resin that is cured by ultraviolet rays or radiation is formed by a spin coating method or the like, or a resin sheet that is cured by ultraviolet rays or radiation is formed by using a transparent adhesive. To be formed.
  • the light transmittance of the light-transmitting layer 8 is not less than 70%, preferably not less than 80% when measured with a spectrophotometer with a light having a wavelength of 405 nm with a thickness of 0.1 mm after curing. Since the light transmission layer 8 is relatively soft and easily damaged, a hard coat layer (not shown) made of an acrylic resin or the like may be provided on the surface on the light incident side.
  • a substrate 2 on which a first information recording layer 3 is formed is prepared. This is formed by the normal process of a single layer optical disc.
  • the substrate 2 is taken out from the mold, and an Ag alloy film is formed on the surface having the guide groove GV1 by sputtering to form the reflective layer 3a.
  • a solution obtained by dissolving an organic dye in a solvent such as TFP is applied onto the reflective layer 3a by spin coating, and dried to form the light absorption layer 3b.
  • the protective layer 3c is formed by sputtering.
  • a resin stamper for forming the guide groove GV2 in the intermediate layer 5 is prepared.
  • Polycarbonate or ZEONOR (trade name: manufactured by Nippon Zeon Co., Ltd.) is injected by an injection molding machine into a mold in which an original Ni stamper is set, and a resin stamper having protrusions that are reverse patterns of guide grooves is formed.
  • a resin stamper is taken out from the mold, and a curable resin is applied to the stamper to a thickness of 20 ⁇ m, for example, by spin coating. Thereafter, the curable resin is cured to form the intermediate layer 5.
  • a cut 7 is formed in the vicinity of the inner peripheral edge of the intermediate layer 5.
  • the resin near the inner peripheral edge of the intermediate layer 5 is rotated while rotating the stamper on which the intermediate layer 5 is formed or rotating the removing means.
  • the removing means include a carbon dioxide gas laser and a YAG laser in addition to a cutter and a pin. In this way, the cuts 7 are formed in the intermediate layer 5 as shown in FIG.
  • an adhesive is applied on the intermediate layer 5.
  • a light transmissive curable resin is preferably used, and examples thereof include an acrylic ultraviolet curable resin.
  • the same UV curable resin used for forming the intermediate layer 5 may be used.
  • the intermediate layer 5 on the stamper is bonded onto the first information recording layer 3 of the substrate 2 prepared in advance.
  • the adhesive layer 4a is also formed on the substrate 2 side, and the adhesive layers are bonded together. Since the adhesive layer has a role of adjusting the thickness, the adhesive layer is bonded so that the total thickness of the intermediate layer 5 and the adhesive layer is a predetermined thickness, for example, 25 ⁇ m.
  • the adhesive layer 4 is cured, and then the stamper is peeled off.
  • the second information recording layer 6 is formed on the surface of the intermediate layer 5 where the guide groove GV2 is formed.
  • a light transmission layer 8 having a thickness of 75 ⁇ m is formed on the second information recording layer 6 to obtain a multilayer optical disc 1 ′ shown in FIG. 2.
  • the adhesive When the adhesive is inserted into the notch 7, as shown in FIG. 10, the adhesive may enter the notch 7 so that the adhesive adheres to the stamper. This part becomes a part where the concentric grooves are interrupted. In such a portion, the adhesive adheres to the stamper, but since the ratio is small, the intermediate layer 5 is not cracked or chipped. If a space is formed in the entire cut 7, the concentric grooves are continuous concentric circles.
  • the multilayer optical disk 11 in FIG. 11 shows a case of DVD ⁇ R, and has the following configuration.
  • a spiral or concentric guide groove GV11 has a disk-like substrate 12 formed on one surface.
  • a first information recording layer 13 is formed on one surface of the substrate 12.
  • An intermediate layer 15 having a spiral or concentric guide groove GV12 on one surface is formed on the first information recording layer 13 via an adhesive layer 14a.
  • a second information recording layer 16 is formed on the intermediate layer 15.
  • a dummy substrate 18 is formed on the second information recording layer 16 through an adhesive layer 14b.
  • the first information recording layer 13 includes a light absorption layer 13b formed on one surface of the substrate 12, and a semi-transmissive reflection layer 13a formed on the light absorption layer 13b. Yes.
  • the second information recording layer 16 is composed of a light absorption layer 16b formed on one surface of the intermediate layer 15 and a reflection layer 16a formed on the light absorption layer 16b.
  • the multilayer optical disk 11 shown in FIG. 3 is that the substrate 12 is necessarily light transmissive, the thickness of the substrate 2 is 0.6 mm, the positions of the reflection layer 13a and the light absorption layer 13b with respect to the substrate 2, and the intermediate layer. 15, the positions of the reflective layer 16a and the light absorbing layer 16b are reversed, the pitch of the guide groove GV11 and the guide groove GV12 is 0.74 ⁇ m, and the wavelength of the laser light used for recording and reproduction is 650 nm Except for this point, the configuration is substantially the same as the multilayer optical disc 1 ′ of the first embodiment. As for the manufacturing process, the formation of the intermediate layer that is the main part of the present invention is the same as in the first embodiment.
  • the multilayer optical disk 21 of FIG. 12 shows a case of a BD-ROM, and has the following configuration.
  • a pit PT1 arranged in a spiral or concentric manner has a disk-like substrate 22 formed on one surface.
  • a first information recording layer 23 is formed on one surface of the substrate 22.
  • an intermediate layer 25 having pits PT2 arranged spirally or concentrically on one surface is formed via an adhesive layer 24.
  • a second information recording layer 26 is formed on one surface of the intermediate layer 25.
  • a light transmission layer 28 is formed on the second information recording layer 26. Since the multilayer optical disk 22 shown in FIG. 12 is read-only, the first information recording layer 23 is composed only of a total reflection metal film.
  • the second information recording layer 26 is composed only of a transflective metal film.
  • the multilayer optical disk 21 shown in FIG. 12 has a point that pit rows are formed on the substrate 22 and the intermediate layer 25, and a point that no light absorption layer exists in the first information recording layer 23 and the second information recording layer 26.
  • the configuration is substantially the same as that of the multilayer optical disc 1 ′ of the first embodiment.
  • the formation of the intermediate layer that is the main part of the present invention is the same as in the first embodiment.
  • Multi-layer type optical disc 2 12, 22 Substrate 3, 13, 23 First information recording layer 3a, 13a, reflective layer 3b, 13b light absorbing layer 3c protective layer 4, 14, 24 adhesive layer 5, 15, 25 intermediate layer 6, 16, 26 second information Recording layer 6a, 16a, reflective layer 6b, 16b light absorption layer 6c protective layer 7, 17, 27 concentric grooves (notches) 8, 28 Light transmission layer 18, dummy substrate

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  • Manufacturing & Machinery (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

L'invention porte sur un support d'enregistrement d'informations optique à multiples couches, qui a un excellent aspect et peu de défauts tels que des fractures, des ébréchures, ou analogues, dans une couche intermédiaire. Le support d'enregistrement d'informations optique à multiples couches comprend un substrat de type disque ayant des parties en cavité disposées de manière concentrique ou en spirale dans une surface de celui-ci, une première couche d'enregistrement d'informations formée sur la surface du substrat, une couche intermédiaire qui est formée sur la première couche d'enregistrement d'informations et qui présente des parties en cavité disposées de manière concentrique ou en spirale dans une surface de celle-ci, et une seconde couche d'enregistrement d'informations formée sur la surface de la couche intermédiaire. Dans le support d'enregistrement d'informations optique à multiples couches, des tranchées concentriques sont formées de façon continue ou intermittente à proximité du bord périphérique interne de la couche intermédiaire.
PCT/JP2010/056000 2009-04-07 2010-04-01 Support d'enregistrement d'informations optique à multiples couches WO2010116945A1 (fr)

Applications Claiming Priority (2)

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JP2009-092780 2009-04-07
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JPH08321074A (ja) * 1995-02-15 1996-12-03 Matsushita Electric Ind Co Ltd 光情報媒体、光情報媒体製造方法および光情報媒体製造装置
JPH1092015A (ja) * 1996-09-18 1998-04-10 Sony Disc Technol:Kk 光ディスク
JPH1139734A (ja) * 1997-07-23 1999-02-12 Sony Corp 光学記録媒体の製造方法
JP2002074756A (ja) * 2000-08-31 2002-03-15 Matsushita Electric Ind Co Ltd 光ディスク、その製造方法及びディスク成形体成形用金型
JP2002260307A (ja) * 2000-09-12 2002-09-13 Matsushita Electric Ind Co Ltd 光情報記録媒体の製造方法、製造装置及び光情報記録媒体
WO2007114285A1 (fr) * 2006-03-31 2007-10-11 Mitsubishi Kagaku Media Co., Ltd. Procede pour la fabrication d'un support d'enregistrement optique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08321074A (ja) * 1995-02-15 1996-12-03 Matsushita Electric Ind Co Ltd 光情報媒体、光情報媒体製造方法および光情報媒体製造装置
JPH1092015A (ja) * 1996-09-18 1998-04-10 Sony Disc Technol:Kk 光ディスク
JPH1139734A (ja) * 1997-07-23 1999-02-12 Sony Corp 光学記録媒体の製造方法
JP2002074756A (ja) * 2000-08-31 2002-03-15 Matsushita Electric Ind Co Ltd 光ディスク、その製造方法及びディスク成形体成形用金型
JP2002260307A (ja) * 2000-09-12 2002-09-13 Matsushita Electric Ind Co Ltd 光情報記録媒体の製造方法、製造装置及び光情報記録媒体
WO2007114285A1 (fr) * 2006-03-31 2007-10-11 Mitsubishi Kagaku Media Co., Ltd. Procede pour la fabrication d'un support d'enregistrement optique

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