WO2005055219A1 - 光記録媒体 - Google Patents
光記録媒体 Download PDFInfo
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- WO2005055219A1 WO2005055219A1 PCT/JP2004/017759 JP2004017759W WO2005055219A1 WO 2005055219 A1 WO2005055219 A1 WO 2005055219A1 JP 2004017759 W JP2004017759 W JP 2004017759W WO 2005055219 A1 WO2005055219 A1 WO 2005055219A1
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- layer
- optical recording
- protective layer
- upper protective
- recording medium
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
- G11B7/259—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers based on silver
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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
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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
- G11B7/2578—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 inorganic materials
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—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
- G11B2007/2431—Metals or metalloids group 13 elements (B, Al, Ga, In)
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- 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
- G11B2007/24312—Metals or metalloids group 14 elements (e.g. Si, Ge, Sn)
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- 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
- G11B2007/24314—Metals or metalloids group 15 elements (e.g. Sb, Bi)
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- 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
- G11B2007/25705—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 inorganic materials
- G11B2007/25706—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 inorganic materials containing transition metal elements (Zn, Fe, Co, Ni, Pt)
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- 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
- G11B2007/25705—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 inorganic materials
- G11B2007/2571—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 inorganic materials containing group 14 elements except carbon (Si, Ge, Sn, Pb)
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- 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
- G11B2007/25705—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 inorganic materials
- G11B2007/25715—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 inorganic materials containing oxygen
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- 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
- G11B2007/25705—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 inorganic materials
- G11B2007/25716—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 inorganic materials containing 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
- G11B7/256—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 improving adhesion between layers
Definitions
- the present invention relates to an optical recording medium that can be used for high-speed recording, such as a CD-RW, a DVD-RW, a DVD + RW, and a DVD-RAM, which can reproduce or record information by irradiating a laser beam.
- the present invention relates to an optical recording medium capable of realizing a recording speed at least four times faster than that of a DVD-ROM with a recording capacity equal to or greater than that of a DVD-ROM.
- phase-change optical recording media that can be reproduced or recorded by laser light irradiation.
- higher recording density and higher linear velocity are expected to enable more information to be recorded faster.
- opportunities for recording on a single phase-change optical recording medium with various recording devices have been increasing.
- the chance of overwriting (inter-company overwrite: ICOW) a phase change optical recording medium recorded by a recording device of one manufacturer with a recording device of another manufacturer is increasing, and the Increasing reproduction errors due to poor recording quality due to the difference has become an issue.
- Patent Documents 13 to 13 disclose a method of performing recording with a somewhat larger power than the initial recording when the recording apparatus overwrites.
- the use of an Ag-based light reflection layer is being considered as a measure to improve the issues related to the ICOW and IVOW.
- Ag having a purity of 98% by weight or more is desirable, and more preferably 99.9% by weight or more of Ag, in order to utilize the high thermal conductivity of Ag.
- Patent Document 8 discloses a method in which Ag contains various additive elements in order to control thermal conductivity.
- Patent Document 9 discloses that by setting the glass transition temperature of resin to 45 ° C. or higher, wrinkles due to water absorption of the resin are eliminated, and corrosion of the Ag reflective layer can be avoided.
- the layer structure of a general phase-change optical recording medium is a substrate Z lower protective layer Z optical recording layer Z upper protective layer Z light reflecting layer. Further, if necessary, an intermediate layer is formed between the lower protective layer and the optical recording layer, between the optical recording layer and the upper protective layer, and between the upper protective layer and the light reflecting layer. With respect to the upper protective layer and the intermediate layer adjacent to the light reflection layer in these layer configurations, various techniques described below are known.
- Patent Document 10 discloses that various metal or metalloid oxides, sulfides, selenides, and fluorides are used as an upper protective layer in order to prevent thermal deformation or evaporation accompanying heating of an optical recording layer. To ensure the mechanical strength and weather resistance of the upper protective layer It is also disclosed that an organic protective layer such as methacrylic resin is laminated on the substrate.
- Patent Document 11 discloses a method of forming an upper and lower protective layer for preventing diffusion of an optical recording layer, and forming a light reflective layer for an optical effect and an optical effect, thereby forming a substrate Z lower protective layer Z optical recording layer Z upper protective layer.
- a basic configuration of a phase change type optical recording medium having a Z light reflection layer is disclosed.
- the upper protective layer various metal or metalloid oxides, sulfides, selenium sulfides, fluorides, etc.
- the thickness is made to be about 150 nm using nitride, nitride, or C, and that the same material as the upper protective layer is used as the lower protective layer!
- Patent Document 12 discloses the use of various metal or metalloid oxides, fluorides, and nitrides for the upper protective layer for the purpose of high sensitivity and long life.
- Patent Document 13 discloses that GeOx is used for the lower protective layer.
- the refractive index is made smaller than that of the optical recording layer, the sensitivity is improved by using the optical interference effect, and the thermal damage to the substrate is reduced. It is stated that it is intended to be used.
- Patent Document 14 states that the properties required for the lower and upper protective layers are 1) transparency in the wavelength region used, 2) a relatively high melting point, and 3) no cracking. Conventional GeO as lower and upper protective layers to meet the requirements of
- Patent Documents 15-16 disclose that the properties required for the lower and upper protective layers are: 1) transparency in the operating wavelength range, 2) the melting point is higher than the operating temperature, and 3) mechanical properties. High strength, 4) chemically stable, 5) having an appropriate thermal constant (thermal conductivity, specific heat), especially compared to the lower and upper protective layers of Patent Document 14. It aims to improve mechanical and thermal properties and improve overwrite performance. It is proposed to use a mixture of a crystalline chalcogenide such as ZnS, ZnSe, and ZnTe and a glass material such as SiO, GeO, SnO, InO, and TeO as the lower and upper protective layers that satisfy these requirements. Sa
- the recording power is reduced when the glass material is about 20 mol%, and as a result, the thermal damage is reduced, thereby improving the overwrite performance.
- Patent Document 18 discloses that protective layers on both sides of a recording layer are made of ZrO or SiO having low thermal conductivity.
- Patent Document 19 states that the ZnS-SiO-based protective layer has a high-temperature high-humidity reliability of 80 ° C and 95% RH.
- a protective layer which is also a mixture of the groups of 25 2 3 3 2 2 3 o has been proposed.
- Patent Document 20 discloses that ZnS'SiO (less than 25 mol%) is used for the lower protective layer and Z is used for the upper protective layer for the purpose of ensuring high-temperature high-humidity reliability, improving overwrite performance and improving recording sensitivity.
- Patent Document 21 discloses that, for the purpose of improving overwrite characteristics, Al O,
- Patent Document 22 proposes using BN, A1N, or SiC having high thermal conductivity for the upper protective layer in order to realize a quenching structure of an optical recording medium.
- Patent Document 23 proposes to use Ta oxide or Ta nitride having high thermal conductivity for the upper protective layer, and use Ag having high thermal conductivity for the reflective layer.
- Patent Document 24 discloses that a barrier layer of SiO, Al O, and MgO is formed on both sides of an optical recording layer,
- each layer is 50-110 nm for the lower protective layer, 11-20 nm for the recording layer, and The thickness of the protective layer is 15-40 nm, the thickness of the light reflection layer is 120-200 nm, and the thickness of the intermediate layer is 2-8 nm.
- Practical materials for each layer include a lower protective layer and an upper protective layer formed of ZnS'SiO.
- GeSbTe, AgInSbTe, GeInSbTe for the recording layer, AlTi, AlTa, Ag, AgPdCu, AgNdCu for the reflective layer, and GeN, GeCr, Si, SiC for the intermediate layer are known.
- Patent Document 25 discloses various metals or metalloids as an intermediate layer in order to prevent a chemical reaction between a sulfur atom present in a protective layer of a phase-change optical recording medium and an Ag-based light reflecting layer.
- an Ag-based product an A1-based product, and a Ta-based product.
- the thickness of the intermediate layer is preferably 40 nm in order to effectively function the corrosion resistance and the high thermal conductivity of the Ag-based light-reflecting layer. It also states that there is no problem with the storage reliability of C85% RH.
- Patent Documents 26 to 28 disclose the use of GeN, GeCrN, and SiC as an anti-sulfuration preventing layer of a light reflecting layer that also has Ag or Ag alloy strength, that is, an intermediate layer.
- Patent Document 29 discloses various metal or metalloid nitrides, oxides and carbides as an intermediate layer, and describes that the thickness of the intermediate layer is preferably 10 nm.
- the thickness of the intermediate layer was too thick at 10 nm, and the initial signal characteristics and the reliability under high humidity of 95% RH were sufficient. .
- phase-change optical recording medium capable of performing high-density recording at a high speed of 4 times or more of DVD
- stable quenching structures and materials of conventional optical recording media cannot be used.
- more reliable measures are desired.
- One such countermeasure would be to avoid using materials containing elements with high reactivity with Ag, such as sulfur and chlorine, in the upper protective layer! / ⁇ .
- Patent Document 30 discloses that a material containing cerium oxide and another oxide is used as a target material of the second dielectric layer in order to realize a phase-change optical recording medium having high storage reliability and good recording / reproducing characteristics. It is disclosed for use.
- the upper protective layer contains almost no sulfur or chlorine! No point is mentioned, and the effect of the crystallinity of the upper protective layer, particularly the crystallinity after recording or rewriting, on the recording characteristics is completely described.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2000-187840
- Patent Document 2 Japanese Patent Application Laid-Open No. 2002-319132
- Patent Document 3 Japanese Patent Application Laid-Open No. 2003-36536
- Patent Document 4 JP-A-57-186244
- Patent Document 5 JP-A-7-3363
- Patent Document 6 JP-A-9-156224
- Patent Document 7 JP-A-2000-285517
- Patent Document 8 Patent No. 2749080
- Patent Document 9 JP 2001-222842 A
- Patent Document 10 Japanese Patent Publication No. 52-2783
- Patent Document 11 Japanese Patent Publication No. 4-61791
- Patent Document 12 JP-A-60-179953
- Patent Document 13 Japanese Patent Publication No. 5-45434
- Patent Document 14 Japanese Patent Publication No. 6-87320
- Patent Document 15 Japanese Patent Publication No. 4 74785
- Patent Document 16 Japanese Patent Publication No. 6-90808
- Patent Document 17 Japanese Patent Publication No. 7-114031
- Patent Document 18 Patent No. 2511964
- Patent Document 19 Patent No. 2915112
- Patent Document 20 Patent No. 2788395
- Patent Document 21 JP-A-5-62244
- Patent Document 22 JP-A-5-151619
- Patent Document 23 JP-A-2002-352472
- Patent Document 24 Japanese Patent Publication No. 8-27980
- Patent Document 25 JP-A-11 238253
- Patent Document 26 JP-A-9-834298
- Patent Document 27 Japanese Patent Application Laid-Open No. 10-275360
- Patent Document 28 JP-A-2002-203338
- Patent Document 29 JP-A-2000-331378
- Patent Document 30 Japanese Patent Application Laid-Open No. 2003-166052
- the above problem is solved by the following inventions 1) to 6) (hereinafter, referred to as the present invention 116).
- the upper protective layer contains at least one of zinc oxide, indium oxide, tin oxide, niobium oxide, silicon nitride, aluminum nitride, and SiOx (l.6 ⁇ x ⁇ l.9).
- An optical recording medium containing at least 0.1% by weight of at least one of sulfur, chlorine and chlorine, and wherein the upper protective layer is amorphous even after recording or rewriting.
- the upper protective layer is composed of two or more layers, and at least one layer is made of zinc oxide, indium oxide, tin oxide, niobium oxide, silicon nitride, aluminum nitride, SiOx (l.6 ⁇ x ⁇ l.9).
- the upper protective layer is composed of two or more layers, and the thickest layer is made of zinc oxide, indium oxide, tin oxide, niobium oxide, silicon nitride, aluminum nitride, SiOx (l. 6 ⁇ x ⁇ l.9).
- the total amount of zinc oxide, indium oxide, tin oxide, niobium oxide, silicon nitride, aluminum nitride and SiOx (l. 6 ⁇ x ⁇ l. 9) contained in the upper protective layer is 60- (1)
- the optical recording medium according to (3), wherein the content is 90 mol%.
- FIG. 1 is a diagram showing an example of a layer configuration of a phase-change optical recording medium of the present invention.
- FIG. 2 is a diagram showing another example of a layer configuration of the phase-change optical recording medium of the present invention.
- CD-RW, DVD-RAM, DVD- RW, upper protective layer of commercialized phase-change optical recording medium of DVD + RW and the like is only (ZnS) (SiO) (mol 0/0). This is this material
- the upper protective layer is made of a material that does not contain elements such as sulfur and chlorine that corrode Ag. It is a corrosion avoidance measure.
- the thickness of the optical recording layer is made as thin as possible to reduce excessive heat generation caused by light absorption.
- the film thickness that can secure mechanical durability due to internal stress, thermal stress, thermal shock, etc. is 8 to 14 nm for the optical recording layer and 412 to 24 nm for the upper protective layer.
- the film thickness that can secure mechanical durability due to internal stress, thermal stress, thermal shock, etc. is 8 to 14 nm for the optical recording layer and 412 to 24 nm for the upper protective layer.
- the force that enables recording and reproduction with a tester is insufficient.
- the modulation degree of the recording signal (maximum reflectivity of the recording signal Z, the amplitude of the recording signal) is set to 0.6 or more in order to ensure stable reproduction by the DVD player.
- the quadruple-speed recording power of DVD + RW discs is set to 22 mW or less.
- Substrate Z lower protective layer (ZnS) (SiO 2) (mol 0
- the upper protective layer material SiO
- SiO silicon dioxide
- the optimum recording power was less than 24mW. This is because the thermal conductivity of the upper protective layer is lower in the amorphous state than in the crystalline state, so that heat dissipation during optical recording was suppressed and the optical recording layer was effective in melting. it is conceivable that.
- the thickness of the lower protective layer is preferably in the range of a film thickness ⁇ lOnm at which the reflectance becomes a minimum value at the recording / reproducing wavelength from the viewpoint of the reflectance and the recording sensitivity.
- the recording layer is rapidly cooled after being heated to about 500 to 700 ° C. Since the upper protective layer is also affected by the temperature change, crystals may be generated. In the case of amorphous, it is thermally and optically isotropic and does not affect the recording characteristics.However, if a small amount of crystal is formed, the crystal grows by repeated recording, causing noise. There is a possibility that the grain boundary force may cause corrosion. Therefore, the upper protective layer of the present invention needs to be amorphous even after recording or rewriting.
- the term “amorphous” as used in the present invention refers to a state where no pattern (spot or diffraction ring) showing crystallinity is observed when electron diffraction is measured with a transmission electron microscope.
- the sensitivity can be improved if the lower protective layer has a film thickness at which the disk reflectance has a minimum value and the upper protective layer is amorphous.
- FIG. 1 and FIG. 2 show examples of the layer configuration of the phase-change optical recording medium of the present invention.
- the basic layer structure is shown in Fig. 1.
- a lower protective layer 2, an optical recording layer 3, an upper protective layer 4, a light reflecting layer 5, a resin layer and a Z or adhesive layer 6 are arranged on an information substrate 1 in this order. Is formed.
- a light reflecting layer, an upper protective layer, an optical recording layer, a lower protective layer, and a resin layer can be formed on a substrate.
- the cover substrate 7 is formed on the adhesive layer.
- FIG. 2 shows, in addition to the basic layer configuration of FIG. 1, a first intermediate layer 8 on the lower protective layer 2, a second intermediate layer 9 on the optical recording layer 3, and a third intermediate layer 9 on the upper protective layer 4.
- An intermediate layer 10 is formed.
- An intermediate layer is formed according to the target performance and the limitations of the manufacturing equipment.
- each layer may be formed by a single film formation or a plurality of film formations. By dividing the formation of one layer into multiple film formations, even if there is a film formation abnormality, it is complemented, preventing fatal layer dropout can do.
- a material that does not substantially contain an Ag corrosive substance is selected and used for the upper protective layer.
- the Ag corrosives in question are sulfur and chlorine. It is preferable that these elements are not contained from the viewpoint of preventing corrosion of Ag.
- the upper protective layer of the present invention does not contain at least 0.1% by weight of at least one of sulfur and chlorine (at least one of sulfur and chlorine). Either content is less than 0.1% by weight). This means that the total amount of sulfur and chlorine is less than 0.1% by weight, but if only one of sulfur and chlorine is contained and the content is less than 0.1% by weight, sulfur and chlorine Is not included at all! /
- a material having a purity of 99.9% by weight is used as the material of the upper protective layer.
- the amount of Ag corrosive substances contained as impurities can be suppressed to 0.1% by weight or less.
- 99. Preferably towards 99 weight 0/0 level purity of material, the manufacturing cost of the material is increased.
- a purity of 99% by weight a small amount of Ag corrosive substances such as sulfur and chlorine may be mixed in.
- Ag is corroded by Ag corrosion substances such as sulfur and chlorine. Or it turns out that the Ag alloy is corroded. All of the upper protective layers studied so far have a purity of 99.9% by weight or more, and if this purity can be maintained, the corrosion of Ag or Ag alloy does not occur.
- the upper protective layer is effective in suppressing the occurrence of cracks, such as zinc oxide, indium oxide, tin oxide, niobium oxide, silicon nitride, aluminum nitride, and SiOx (l. 6 ⁇ x ⁇ l. 9).
- a material having a sputtering rate suitable for the production of an optical recording medium is desired.
- the power of using these suitable materials as the main component means that the main component mentioned here exceeds 50 mol%.
- X of SiOx is less than 1.6, the light transmittance of the film is remarkably reduced, and the film cannot be used as an upper protective layer.
- X exceeds 1.9 the sputtering rate is remarkably reduced, causing a problem in production.
- Materials used in the present invention include Si, Al, Ti, Zn, Zr, Mo, Ta, Nb, and W, which are capable of forming a network with oxygen having a high degree of freedom of bivalent bond rotation in terms of film flexibility. It preferably contains an oxide.
- the film thickness of the upper protective layer is preferably 424 nm.
- the thickness is smaller than 4 nm, the heat storage function of the upper protective layer cannot be sufficiently performed, and recording with an existing semiconductor laser becomes difficult. On the other hand, when the thickness is more than 24 ⁇ m, cracks are generated as described above.
- a more desirable thickness of the upper protective layer is 8 to 20 nm.
- the phase-change optical recording medium is manufactured by continuous film formation by S sputtering, a lower protective layer Z, an optical recording layer Z, an upper protective layer Z, a light reflecting layer.
- the film requiring the longest film forming time is the film forming of the lower protective layer or the light reflecting layer having a larger film thickness than the other layers. Therefore, in order to efficiently form the upper protective layer without loss, the upper protective layer should be formed at a time equal to or shorter than the film forming time of the lower protective layer or the light reflecting layer. It is desired that the film forming conditions be such that the film thickness can be formed.
- the deposition rate of the upper protective layer must be at least InmZs or more, preferably 3 nmZs or more.
- the critical deposition rate is less than lOnmZs, preferably less than 8 nmZs.
- the limit film forming speed is the speed at which the film is formed with the highest possible power (4 kW RF power supply) when forming the film with the current manufacturing equipment.
- Table 1 shows the critical deposition rates of various upper protective layer materials.
- Materials having a desired film forming speed of lnm / s or more and 10 nm / s or less according to the present invention were zinc oxide, indium oxide, oxidized tin, niobium oxide, silicon nitride, aluminum nitride, and SiOx.
- the film formation rate is reduced, but SiO
- the interface between the upper protective layer and the light reflection layer containing Ag or an Ag alloy as a main component is made of Ag—O.
- the formation of the bond was effective, and the Ag—O bond was confirmed by analytical methods such as XPS.
- A1N and SiN are used for the upper protective layer,
- the optical recording layer material is preferably a phase change material containing 60 to 90 atomic% of Sb.
- Sb a phase change material containing 60 to 90 atomic% of Sb.
- InSb containing Sb 60- 90 atomic 0/0, GaSb, GeSb, GeSbSn, GaGeSb, GeSb Te, GaGeSbSn, AgInSbTe, GeInSbTe, and the like GeGaSbTe.
- the melting time of the optical recording layer at the time of recording / erasing can be shortened, and the thermal damage of the optical recording layer and the upper protective layer can be reduced.
- the initial melting crystallization of the optical recording medium can be performed at a high speed, so that thermal damage is reduced.
- the initialization linear velocity can be made 10 OmZs or more, and the thermal damage can be further reduced.
- Sb exceeds 90 atomic%, even if various elements are added, the reliability of the mark at high temperature and high humidity is poor, which is not preferable.
- the thickness of the optical recording layer is preferably 8 to 14 nm. If the thickness is less than 8 nm, crystallization of the recording mark at high temperature and high humidity of 80 ° C and 85% RH will be accelerated, and the life will be a problem. On the other hand, when the thickness exceeds 14 nm, heat is generated at the time of optical recording and erasing, and thermal damage to the upper protective layer becomes remarkable, which causes cracks in the upper protective layer.
- the material of the lower protective layer is SiO, SiO, ZnO, SnO, Al O, TiO, In O, Mg
- oxides such as ZrO; nitrides such as SiN, A1N, TiN, BN, ZrN; ZnS, TaS
- the optical constant, thermal expansion coefficient, and elastic modulus are optimized (ZnS) ( SiO 2) (mol%) is desirable.
- the thickness of the lower protective layer depends on the reflectivity
- the film thickness be such that the disk reflectance becomes a minimum value with respect to the film thickness of the lower protective layer. In this film thickness region, the recording sensitivity is good, recording can be performed with a smaller power of thermal damage, and the overwrite performance is improved.
- the lower protective layer Zn S (SiO) (mol 0/0)
- Zn S SiO
- the thickness is too thin, thermal damage to the substrate becomes large, and the groove shape is deformed. On the other hand, if the thickness is more than 65 nm, the reflectivity of the disk increases and the sensitivity decreases.
- Ag or an Ag alloy is used for the light reflection layer, and a purity of 98% by weight or more is required in order to fully utilize the heat conductivity and high reflectance, which are characteristics of Ag.
- the resin protective layer or the adhesive layer covering the Ag-based light reflective layer to suppress moisture permeation was determined. It was found that it depends on the glass transition temperature. Above the glass transition temperature, the moisture permeability and the coefficient of linear expansion of the resin protective layer or the adhesive layer are greatly increased. As a result, it was found that the corrosion of the Ag-based reflective layer and the arrival of moisture on the Ag surface, which is the main cause of film peeling, were promoted, and the optical recording medium was degraded.
- the glass transition temperature of the resin protective layer or the adhesive layer in contact with the Ag-based reflective layer must be adjusted. It is effective to set the temperature to 90 ° C or higher.
- the glass transition temperature of the resin protective layer or the adhesive layer is too high, the bending strength of the optical recording medium decreases, and the optical recording medium tends to crack when dropped on the floor or taken out of the plastic case. Occurs.
- the glass transition temperature of the resin protective layer or the adhesive layer in contact with the Ag-based light reflecting layer is 180 ° C or lower, preferably 165 ° C or lower.
- the difference in glass transition temperature between the resin protective layer and the adhesive layer provided on the Ag reflective layer should be 50 ° C or less, and preferably 30 ° C or less. It is desirable to keep the temperature below ° C. It is also effective to use the same material for the resin protective layer and the adhesive layer.
- the glass transition temperature (Tg) is defined as the temperature at which the specific volume, specific heat, refractive index, dielectric constant, diffusion constant, elastic modulus, etc., change rapidly when the resin changes due to a rise in temperature.
- the Tg of the resin changes depending on the chemical structure of the starting monomers that make up the resin, the size of the substituents, and the intermolecular force resulting from the polarity. Tg can also obtain an inflection point force of tan ⁇ by a viscoelasticity measuring device.
- the optimum film thickness of the optical recording layer and the upper protective layer of the present invention is around lOnm, which is thinner than before, and control of the interface is important.
- the interface between the optical recording layer and the upper protective layer of the conventional phase-change optical recording medium was able to tolerate some mutual diffusion.
- sufficient signal characteristics cannot be obtained with the conventional level of cross-diffusion!
- An analysis of mutual diffusion in the depth direction by Auger electron spectroscopy shows that initial characteristics cannot be obtained unless the mutual diffusion region is at least 2 nm or less.
- it is important to lower the substrate temperature. In the study of the present inventors, it was important to sufficiently cool the inside of the sputtering chamber and maintain the substrate temperature at 60 ° C. or less. Desirably, it is 50 ° C or less.
- the material of the substrate is usually glass, ceramics, or resin, and the resin substrate is suitable in terms of moldability and cost.
- the resin include polycarbonate resin, acrylic resin, epoxy resin, polystyrene resin, acrylonitrile styrene copolymer resin, polyethylene resin, polypropylene resin, silicone resin, fluorine resin, Examples thereof include ABS resin and urethane resin, and polycarbonate resin and acrylic resin, which are excellent in moldability, optical properties, and cost, are preferable.
- optical recording medium of the present invention when applied to a rewritable optical recording medium compatible with DVD-ROM, it is desirable that the following specific conditions be given.
- the width of the guide groove formed on the substrate is 0.10 to 0.40 m, preferably 0.15 to 0.35 m, and the depth of the guide groove is 15 to 45 nm, preferably 20 to 40 nm. It is 40 nm.
- the thickness of the substrate is preferably 0.55 to 0.65 mm, and the thickness of the disc after bonding is preferably 1.1 to 1.3 mm.
- the width of the guide groove of the substrate ⁇ ). 25-0.65 / zm, preferably 0.30-0.60 m, Guide groove depth force ⁇ 20—50 ⁇ m, preferably 25-45 nm.
- an ultraviolet curable resin prepared by a spin coating method is preferable.
- An appropriate thickness is 3-15 ⁇ m. If the thickness is less than 3 ⁇ m, an increase in error may be observed when a printing layer is provided on the overcoat layer. On the other hand, if the thickness is more than 15 m, the internal stress increases, which greatly affects the mechanical properties of the disk.
- an ultraviolet curable resin produced by a spin coating method is generally used.
- the appropriate thickness is 2-6 m. If it is thinner, sufficient scratch resistance cannot be obtained. If the thickness is more than 6 m, the internal stress increases, which greatly affects the mechanical properties of the disk.
- the hardness must be higher than the pencil hardness H, which does not cause large scratches even when rubbed with a cloth. It is also effective to mix a conductive material as necessary to prevent electrification and prevent adhesion of dust and the like.
- the printing layer is used for the purpose of ensuring abrasion resistance, label printing of a brand name, etc., and formation of an ink receiving layer for an ink jet printer, and it is preferable to form an ultraviolet curable resin by a screen printing method. is there.
- the appropriate thickness is 3-50 m. If the thickness is less than 3 m, unevenness occurs during layer formation. If the thickness is more than 50 m, the internal stress increases, which greatly affects the mechanical properties of the disk.
- an adhesive such as an ultraviolet curable resin, a hot melt adhesive, or a silicone resin can be used. These materials are applied onto the overcoat layer or the print layer by spin coating, roll coating, screen printing, etc., depending on the material, and then subjected to treatment such as ultraviolet irradiation, heating, and pressurization. Glue to disc.
- the opposite disk may be a similar single-plate disk or a transparent substrate only. The bonding surface of the opposite disk may or may not be coated with an adhesive layer material. Further, an adhesive sheet can be used as the adhesive layer.
- the thickness of the adhesive layer is not particularly limited, but is 5 to 100 m, preferably 7 to 80 m, in consideration of the applicability of the material, the curability, and the effect of the mechanical properties of the disk.
- the range of the adhesive surface is not particularly limited, but when applied to rewritable discs compatible with DVD and Z or CD, in order to enable high-speed recording, it is necessary to secure adhesive strength. It is desirable that the position of the inner peripheral end is ⁇ 15-40 mm, preferably ⁇ 15-30 mm.
- the recording sensitivity can be improved, and the upper protective layer is a corrosive substance of Ag, which is preferable for preventing the corrosion of Ag and contains substantially no sulfur and chlorine. Therefore, it is possible to provide an optical recording medium that can completely prevent Ag corrosion.
- an optical recording medium with high productivity can be provided.
- the upper protective layer can be more stably produced as an amorphous material.
- high-speed initialization is possible to avoid heat accumulation, reduce thermal damage to the upper protective layer, etc. due to initialization, and improve the weather resistance of the optical recording medium.
- a plasma power of 4kWZ200mm (i) is applied to the protective layer at a film formation rate of 4.2nmZs at a film formation speed of 4.2nmZs, and a 12nm thick (NbO) (SiO) 99.99 weight 0/0)
- the concentration of chlorine and sulfur in the upper protective layer was set to 0.1% by weight or less.
- a 140 nm layer structure was formed.
- a UV curable resin (SD318, manufactured by Dainippon Ink and Chemicals, Inc.) having a room temperature viscosity of 120 cps and a glass transition temperature of 149 ° C. after curing was spin-coated to form a resin protective layer.
- a single-plate disk of a phase-change optical recording medium was formed.
- a polycarbonate bonded substrate is bonded with a UV-curable adhesive (DVD003, manufactured by Nippon Kayaku Co., Ltd.) that has a room temperature viscosity of 450 cps and a glass transition temperature of 75 ° C after curing.
- An optical recording medium was obtained.
- phase-change optical recording medium was measured at a recording linear velocity of 14 mZs, a wavelength of 657 nm, a NAO of 65, and a recording power of 17 to 22 mW using a recording and reproduction evaluation device DDU1000 manufactured by Pulstec. Overwritten (DOW) in a format that can play DVD-ROM. As a result, the jitter was as good as 9% or less even after overwriting 2000 times.
- these recorded phase-change optical recording media were stored at 80 ° C and 85% RH for a predetermined period of time. As a result, no deterioration was observed after storage for 200 hours.
- the electron beam diffraction of the upper protective layer was found to be amorphous and low in pattern. Also, since the film formation rate of the upper protective layer was appropriate, the overall production rate was not affected.
- the concentration of chlorine and sulfur in the upper protective layer was set to 0.1% by weight or less.
- a UV curable resin (SD318, manufactured by Dainippon Ink and Chemicals, Inc.) having a room temperature viscosity of 120 cps and a glass transition temperature of 149 ° C. after curing was spin-coated to form a resin protective layer.
- a single-plate disk of a phase-change optical recording medium was formed.
- a polycarbonate bonded substrate is bonded with a UV-curable adhesive (DVD003, manufactured by Nippon Kayaku Co., Ltd.) that has a room temperature viscosity of 450 cps and a glass transition temperature of 75 ° C after curing.
- a UV-curable adhesive (DVD003, manufactured by Nippon Kayaku Co., Ltd.) that has a room temperature viscosity of 450 cps and a glass transition temperature of 75 ° C after curing.
- An optical recording medium was obtained.
- phase-change optical recording medium using a recording and reproducing evaluation device DDU1000 manufactured by Pulstec, at a recording linear velocity of 14 mZs, a wavelength of 657 nm, NA of 0.65, and a recording power of 17 to 22 mW, Overwritten (DOW) in a format that can play DVD-ROM.
- DDU1000 manufactured by Pulstec
- phase-change optical recording media were stored at 80 ° C and 85% RH for a predetermined time. As a result, no deterioration was observed after storage for 200 hours. As a result of TEM observation of these recorded phase-change optical recording media, the electron beam diffraction of the upper protective layer was found to be amorphous and low in pattern. Also, since the film formation rate of the upper protective layer was appropriate, the overall production rate was not affected.
- the chlorine and sulfur concentrations of the upper protective layer were set to 0.1% by weight or less.
- a UV curable resin (SD318, manufactured by Dainippon Ink and Chemicals, Inc.) having a room temperature viscosity of 120 cps and a glass transition temperature of 149 ° C. after curing was spin-coated to form a resin protective layer.
- a single-plate disk of a phase-change optical recording medium was formed.
- a polycarbonate bonded substrate is bonded with a UV-curable adhesive (DVD003, manufactured by Nippon Kayaku Co., Ltd.) that has a room temperature viscosity of 450 cps and a glass transition temperature of 75 ° C after curing.
- a UV-curable adhesive (DVD003, manufactured by Nippon Kayaku Co., Ltd.) that has a room temperature viscosity of 450 cps and a glass transition temperature of 75 ° C after curing.
- An optical recording medium was obtained.
- phase-change optical recording medium using a recording and reproducing evaluation device DDU1000 manufactured by Pulstec, at a recording linear velocity of 14 mZs, a wavelength of 657 nm, NA of 0.65, and a recording power of 17 to 22 mW, Overwritten (DOW) in a format that can play DVD-ROM.
- DDU1000 manufactured by Pulstec
- phase-change optical recording media were stored at 80 ° C and 85% RH for a predetermined time. As a result, no deterioration was observed after storage for 200 hours. As a result of TEM observation of these recorded phase-change optical recording media, electron beam diffraction of the upper protective layer showed that It was a low pattern.
- a plasma power of 4kWZ200mm (i) is applied to the protective layer at a deposition rate of 5.5nmZs at a film forming speed of 5.5nmZs, and a 12nm thick (InO) (ZrO) 99. 99% by weight)
- the concentration of chlorine and sulfur in the upper protective layer was set to 0.1% by weight or less.
- a 140 nm layer structure was formed.
- a UV curable resin (SD318, manufactured by Dainippon Ink and Chemicals, Inc.) having a room temperature viscosity of 120 cps and a glass transition temperature of 149 ° C. after curing was spin-coated to form a resin protective layer.
- a single-plate disk of a phase-change optical recording medium was formed.
- a polycarbonate bonded substrate is bonded with a UV-curable adhesive (DVD003, manufactured by Nippon Kayaku Co., Ltd.) that has a room temperature viscosity of 450 cps and a glass transition temperature of 75 ° C after curing.
- a UV-curable adhesive (DVD003, manufactured by Nippon Kayaku Co., Ltd.) that has a room temperature viscosity of 450 cps and a glass transition temperature of 75 ° C after curing.
- An optical recording medium was obtained.
- a recording linear velocity of 14 mZs, a wavelength of 657 nm, a NA of 0.65, and a recording power of the obtained phase-change optical recording medium were measured using a recording and reproducing evaluation device DDU1000 manufactured by Pulstec. It was overwritten (DOW) in a format that can play DVD-ROM at 17-22mW.
- phase-change optical recording media were stored at 80 ° C and 85% RH for a predetermined period of time. As a result, no deterioration was observed after storage for 200 hours. As a result of TEM observation of these recorded phase-change optical recording media, the electron beam diffraction of the upper protective layer was found to be amorphous and low in pattern. Also, since the film formation rate of the upper protective layer was appropriate, the overall production rate was not affected.
- a UV curable resin (SD318, manufactured by Dainippon Ink and Chemicals, Inc.) having a room temperature viscosity of 120 cps and a glass transition temperature of 149 ° C. after curing was spin-coated to form a resin protective layer.
- a single-plate disk of a phase-change optical recording medium was formed.
- a polycarbonate bonded substrate is bonded with a UV-curable adhesive (DVD003, manufactured by Nippon Kayaku Co., Ltd.) that has a room temperature viscosity of 450 cps and a glass transition temperature of 75 ° C after curing.
- a UV-curable adhesive (DVD003, manufactured by Nippon Kayaku Co., Ltd.) that has a room temperature viscosity of 450 cps and a glass transition temperature of 75 ° C after curing.
- An optical recording medium was obtained.
- phase-change optical recording medium was measured at a recording linear velocity of 14 mZs, a wavelength of 657 nm, a NAO of 65, and a recording power of 17 to 22 mW using a recording and reproduction evaluation device DDU1000 manufactured by Pulstec. Overwritten (DOW) in a format that can play DVD-ROM.
- DOW Overwritten
- the jitter was as good as 9% or less even after overwriting 2000 times. Also, the recording power at which the jitter was minimized was about 1.5 mW smaller than that of Examples 14 to 14, and improvement in sensitivity due to the lamination of the upper protective layer was observed.
- a 140 nm layer structure was formed.
- the room temperature viscosity was 120 cps, and the glass transition temperature after curing was 149 ° C.
- a UV-curable resin (SD318, manufactured by Dainippon Ink and Chemicals, Inc.) was spin-coated to form a resin protective layer, and a single-plate disk of a phase-change optical recording medium was produced.
- the laminated substrate made of polycarbonate is laminated with an ultraviolet-curable adhesive (DVD003, manufactured by Nippon Kayaku) whose viscosity at room temperature is 450 cps and the glass transition temperature after curing is 75 ° C. Obtained.
- DVD003 ultraviolet-curable adhesive
- phase-change optical recording medium was recorded on a DVD-ROM at a linear velocity of 14 mZs, a wavelength of 657 nm, NAO.65, a recording power of 17 to 22 mW, using a recording and reproducing evaluation device manufactured by Pulstec.
- the reflectance after recording was 15%.
- DVD-ROM playback compatibility performance has been significantly reduced. This is because phase-change optical memory was used because the upper protective layer was made of SiO, which has a large light absorption due to lack of oxygen.
- an ultraviolet-curable resin (SD318, manufactured by Dainippon Ink and Chemicals, Inc.) having a room temperature viscosity of 120 cps and a glass transition temperature of 149 ° C. after curing was spin-coated.
- a fat protective layer was formed, and a single-plate disk of a phase-change optical recording medium was manufactured.
- the laminated substrate made of polycarbonate is laminated with an ultraviolet-curable adhesive (DVD003, manufactured by Nippon Kayaku) whose viscosity at room temperature is 450 cps and the glass transition temperature after curing is 75 ° C. Obtained.
- DVD003 ultraviolet-curable adhesive
- the obtained phase-change optical recording medium was recorded on a DVD / DVD at a linear velocity of 14 m / s, a wavelength of 657 nm, NAO.
- the modulation factor after recording was 0.5.
- DVD-ROM playback compatibility performance has been significantly reduced. This is probably because the upper protective layer was as thin as nm nm, so that the recording power was not effectively used and the modulation degree of the phase-change optical recording medium was reduced.
- an ultraviolet curable resin (SD318, manufactured by Dainippon Ink and Chemicals, Inc.) having a room temperature viscosity of 120 cps and a glass transition temperature of 149 ° C. after curing was spin-coated on the Ag light reflecting layer to form a resin protective layer. Then, a single-plate disk of a phase-change optical recording medium was manufactured. Next, the laminated substrate made of polycarbonate is laminated with an ultraviolet-curable adhesive (DVD003, manufactured by Nippon Kayaku) whose viscosity at room temperature is 450 cps and the glass transition temperature after curing is 75 ° C. Obtained.
- DVD003 ultraviolet-curable adhesive
- phase-change optical recording medium using a recording and reproducing evaluation device manufactured by Pulstec Co., Ltd., at a linear velocity of 14 m / s, a wavelength of 657 nm, NAO.65, a recording power of 20 mW, and a DV D- Recorded in ROM-reproducible format.
- the recorded phase-change optical recording medium was stored at 80 ° C and 85% RH for 300 hours, an increase in errors was observed.
- a fine spot pattern was observed in electron beam diffraction of the upper protective layer. This is probably because the upper protective layer was as thick as 25 mm and the amorphous stability of the upper protective layer was reduced. Comparative Example 4
- the light reflecting layer has a 140 nm thick Ag (99.99
- the amount% eight 8 forming a 140nm and ⁇ U layer structure.
- an ultraviolet-curable resin (SD318, manufactured by Dainippon Ink and Chemicals, Inc.) having a room temperature viscosity of 120 cps and a glass transition temperature of 149 ° C. after curing was spin-coated.
- a fat protective layer was formed, and a single-plate disk of a phase-change optical recording medium was manufactured.
- the laminated substrate made of polycarbonate is laminated with an ultraviolet-curable adhesive (DVD003, manufactured by Nippon Kayaku) whose viscosity at room temperature is 450 cps and the glass transition temperature after curing is 75 ° C. Obtained.
- DVD003 ultraviolet-curable adhesive
- phase-change optical recording medium using a recording and reproducing evaluation device manufactured by Pulstec Co., Ltd., at a linear velocity of 14 m / s, a wavelength of 657 nm, NAO.65, a recording power of 20 mW, and a DV D- Recorded in ROM-reproducible format.
- the recorded phase-change optical recording medium was stored at 80 ° C and 85% RH for 300 hours, an increase in errors was observed. This is probably because the optical recording layer was as thin as 7 nm, so that the crystallization of the recording mark at the interface of the optical recording layer became dominant, and the recording mark was crystallized.
- an ultraviolet curable resin (SD318, manufactured by Dainippon Ink and Chemicals, Inc.) having a room temperature viscosity of 120 cps and a glass transition temperature of 149 ° C. after curing was spin-coated to form a resin protective layer. Then, a single-plate disk of a phase-change optical recording medium was manufactured. Next, the laminated substrate made of polycarbonate is laminated with an ultraviolet-curable adhesive (DVD003, manufactured by Nippon Kayaku) whose viscosity at room temperature is 450 cps and the glass transition temperature after curing is 75 ° C. Obtained.
- DVD003 ultraviolet-curable adhesive
- phase-change optical recording medium was recorded on a DVD / DVD at a linear velocity of 14 m / s, a wavelength of 657 nm, NAO. -Overwritten (DOW) in a format that allows ROM playback.
- DOW NAO. -Overwritten
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Abstract
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EP1917661A1 (en) * | 2005-08-25 | 2008-05-07 | Ricoh Company, Ltd. | Optical recording medium |
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WO2005091282A1 (en) * | 2004-03-18 | 2005-09-29 | Ricoh Company, Ltd. | Optical recording medium and two layered optical recording medium, recording and reproducing method and recording and reproducing apparatus using media |
WO2007029759A1 (en) * | 2005-09-05 | 2007-03-15 | Ricoh Company, Ltd. | Multilayer optical recording medium and optical recording method |
EP1977420A4 (en) * | 2006-01-23 | 2009-08-26 | Ricoh Kk | OPTICAL RECORDING MEDIUM |
EP1993847B1 (en) | 2006-03-10 | 2011-10-26 | Ricoh Company, Ltd. | Optical recording medium |
JP2010192025A (ja) * | 2009-02-17 | 2010-09-02 | Sony Corp | 光情報記録媒体 |
JP4735734B2 (ja) * | 2009-04-02 | 2011-07-27 | Tdk株式会社 | 光メディア用スパッタリングターゲット、その製造方法、ならびに、光メディア、およびその製造方法 |
JP5680382B2 (ja) * | 2010-11-19 | 2015-03-04 | パナソニックIpマネジメント株式会社 | 蓄熱装置およびこれを備える空気調和装置 |
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JP2002269825A (ja) * | 2001-03-14 | 2002-09-20 | Ricoh Co Ltd | 光記録媒体 |
JP2002288828A (ja) * | 2001-03-23 | 2002-10-04 | Ricoh Co Ltd | 光記録方法および光記録媒体 |
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- 2004-11-30 EP EP04819814A patent/EP1696430A4/en not_active Withdrawn
- 2004-11-30 CN CN2004800362079A patent/CN1890732B/zh not_active Expired - Fee Related
- 2004-12-03 TW TW093137547A patent/TWI264716B/zh not_active IP Right Cessation
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2006
- 2006-06-02 US US11/445,290 patent/US20060291368A1/en not_active Abandoned
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JP2002100076A (ja) * | 2000-09-25 | 2002-04-05 | Ricoh Co Ltd | 光記録媒体及びその製造方法 |
JP2002269825A (ja) * | 2001-03-14 | 2002-09-20 | Ricoh Co Ltd | 光記録媒体 |
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EP1917661A1 (en) * | 2005-08-25 | 2008-05-07 | Ricoh Company, Ltd. | Optical recording medium |
EP1917661A4 (en) * | 2005-08-25 | 2009-01-14 | Ricoh Kk | OPTICAL RECORDING MEDIUM |
Also Published As
Publication number | Publication date |
---|---|
TW200522060A (en) | 2005-07-01 |
US20060291368A1 (en) | 2006-12-28 |
EP1696430A4 (en) | 2009-02-18 |
JP2005190642A (ja) | 2005-07-14 |
CN1890732B (zh) | 2011-06-08 |
EP1696430A1 (en) | 2006-08-30 |
CN1890732A (zh) | 2007-01-03 |
TWI264716B (en) | 2006-10-21 |
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