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WO2009099015A1 - Optical information recording medium and method for manufacturing same - Google Patents

Optical information recording medium and method for manufacturing same Download PDF

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Publication number
WO2009099015A1
WO2009099015A1 PCT/JP2009/051671 JP2009051671W WO2009099015A1 WO 2009099015 A1 WO2009099015 A1 WO 2009099015A1 JP 2009051671 W JP2009051671 W JP 2009051671W WO 2009099015 A1 WO2009099015 A1 WO 2009099015A1
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WO
WIPO (PCT)
Prior art keywords
layer
optical information
recording
recording medium
hard coat
Prior art date
Application number
PCT/JP2009/051671
Other languages
French (fr)
Japanese (ja)
Inventor
Isao Matsuda
Yutaka Shibata
Masashi Hattori
Takeshi Otsu
Original Assignee
Taiyo Yuden Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Taiyo Yuden Co., Ltd. filed Critical Taiyo Yuden Co., Ltd.
Publication of WO2009099015A1 publication Critical patent/WO2009099015A1/en

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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
    • G11B7/26—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
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24056—Light transmission layers lying on the light entrance side and being thinner than the substrate, e.g. specially adapted for Blu-ray® discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/254—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers
    • G11B7/2542—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers consisting essentially of organic resins
    • 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
    • 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)
    • 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
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    • 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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    • 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
    • G11B2007/25713—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 nitrogen
    • G—PHYSICS
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
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    • 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
    • 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
    • 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
    • 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
    • G11B7/2433—Metals or elements of Groups 13, 14, 15 or 16 of the Periodic Table, e.g. B, Si, Ge, As, Sb, Bi, Se or Te
    • 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
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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
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    • 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
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
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    • 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 an optical information recording medium capable of reducing the influence on the recording characteristics due to adhesion of a fingerprint, particularly in a write-once type optical information recording medium having a high recording density, and a method for manufacturing the same.
  • An optical information recording medium such as write-once CD (CD-R), write-once DVD (DVD ⁇ R) or write-once Blu-ray disc (BD-R), that is, an optical disc, has a recording layer on one side of the disc-shaped substrate. It has a structure in which a reflective layer and, if necessary, a protective layer are formed. In addition, spiral or concentric grooves called groups are formed on the surface of the substrate on the side where the recording layer and the reflective layer are formed, and convex portions called lands are formed between adjacent groups. .
  • recording is performed by irradiating a recording layer on the recording layer with a recording laser beam to form pits.
  • the length of the pit, the length between the pitch and the pit hereinafter referred to as the space), and their arrangement are reproduced by irradiating the reproduction laser beam and reading the reflected light as a reproduction signal. Is done.
  • the recording laser beam and the reproducing laser beam are irradiated to the recording layer through the light transmission layer.
  • the light-transmitting layer is on a light-transmitting disc-shaped substrate (thickness is 1.2 mm for CD-R, 0.6 mm for 0 0 ⁇ 13 ⁇ 4) for CD-R and DVD soil R. Since it has a structure in which the recording layer and the reflective layer are sequentially formed, the light-transmitting disk-shaped substrate corresponds to the light-transmitting layer.
  • a reflective layer and a recording layer were sequentially formed on a disk substrate having a thickness of 1.1 mm, and a transparent cover layer having a thickness of 0.1 mm was formed on the recording layer. Since it has a structure, the transparent cover layer corresponds to the light transmission layer.
  • an On Groo Ve recording method for forming pits in the recording layer formed on the land of the disk-shaped substrate, and a groove on the disk-shaped substrate.
  • the On Gro Ve Ve recording method is used for BD-R, which uses an inorganic material for the recording layer
  • the In Gro Gro Ve recording method is used for BD—R, which uses an organic dye for the recording layer. Yes.
  • the surface of the light transmitting layer on which the laser beam is incident is scratched or fingerprinted, the spot shape of the laser beam may be disturbed, and the recording quality may deteriorate. This effect is particularly noticeable in high-density recording optical discs such as DVD SAT R and BD-R. Therefore, the surface of the light transmission layer
  • An optical disc having a hard coat layer formed thereon is commercialized. Since this hard coat layer uses a light-transmitting material that is harder than the material constituting the light-transmitting layer, the light-transmitting layer is less likely to be damaged.
  • an optical disc whose recording characteristics (for example, jitter characteristics) when an artificial fingerprint is attached to the surface of the light transmission layer and wiped off is at a level that does not cause an error is disclosed in Japanese Patent Laid-Open No. 1 1 4 4 7 Published in the gazette.
  • Patent Document 1 Japanese Patent Laid-Open No. 2 0 0 5-0 0 1 1 4 4
  • the optical disk disclosed in Patent Document 1 is premised on wiping off the attached fingerprints.
  • the surface of the light transmission layer or the surface of the hard coat layer may be damaged.
  • the spot shape of the laser beam is disturbed at that portion, and the recording characteristics are deteriorated. This is a significant effect on high-density recording optical discs such as BD-R.
  • the effect is increased because the In G roo Ve recording method is adopted. This is because the wavelength of the laser beam is 4 05 ⁇ and the width of the group is about 0.16 ⁇ m, so recording is performed in a state that exceeds the diffraction limit. This is because the influence of the disorder of the spot shape of the laser light becomes larger.
  • the present invention provides an optical information recording medium that can solve such problems and can obtain good recording characteristics even with fingerprints attached.
  • an optical information recording medium comprising: a recording layer; and a light transmitting layer through which the laser light applied to the recording layer passes.
  • a hard coat is applied to the surface of the light transmitting layer.
  • An optical information recording medium is proposed in which the hard coat layer is a resin having a contact angle with particulate triolein on the cured film of 50 ° or more.
  • Triolein is used as a dispersion medium for artificial fingerprint liquids, and the state where artificial fingerprints using triolein as a dispersion medium on the surface of the hard coat layer are attached is close to the actual state of adhesion of fingerprints. It is. If the maximum particle size of this triolein is 15 / m or less, good recording characteristics can be obtained even with the fingerprint still attached. According to the first solution described above, the maximum particle size when adhering an artificial fingerprint liquid using triolein as a dispersion medium is 15 Um or less, so that good recording characteristics can be obtained even with a fingerprint still attached. it can. "Hard As shown in Fig.
  • the contact angle with triolein on the top of the chemical coating diagram is the diameter (r) of the droplet from the apex T of the triolein particle and the end point A of the triolein particle.
  • the contact angle is calculated from the formula (A) and the formula (B) after obtaining the height (h).
  • This contact angle can be measured by using a contact angle meter (for example, C A-X type manufactured by Kyowa Interface Science Co., Ltd.).
  • the hard coat layer is an optical information which is a resin having a contact angle with triolein on the cured film of 60 ° or more. Propose a recording medium. If the contact angle is 60 ° or more, the maximum particle size when adhering artificial fingerprint liquid using triolein as a dispersion medium is 1 O jW m or less. At this level, it is possible to obtain good recording characteristics even in the state in which the fingerprint remains attached even in the organic dye-based BD-R adopting the InGrooVe recording method.
  • the hard coat layer is formed of a resin containing a silicon-based or fluorine-based leveling agent. As the amount of the repelling agent contained in this resin increases, the contact angle with triolein increases. When the leveling agent content is 1.0% to 3.0%, the contact angle is 50. As described above, preferably, the contact angle is 60 ° or more when it is 1.5% to 3.0%.
  • the silicon leveling agent and the fluorine leveling agent may be used alone or in combination.
  • Such a hard coat layer can be formed by applying a resin material having a contact angle with triolein on a cured coating of 50 ° or more, preferably 60 ° or more, by a spin-collision method. .
  • the optical information recording medium of the present invention can provide good recording characteristics even with a fingerprint still attached. Since such an optical information recording medium does not require the fingerprint to be wiped off, there is less possibility of scratching the light transmission layer or the hard coat layer when the fingerprint is wiped off.
  • FIG. 1 A partial cross section schematically showing an enlarged part of a cross section of an optical information recording medium.
  • FIG. 2 is a schematic diagram showing the state of triolein on the hard coat layer.
  • FIG. 3 is a schematic cross-sectional view for explaining a 3 InG rooVe recording method.
  • FIG. 4 is a schematic cross-sectional view for explaining a 4 OnGrooVe recording method. Explanation of symbols
  • An optical information recording medium 1 shown in FIG. 1 has a thickness of 1.1 mm, in which a group 3 and a land 4 having a width of 0.16 im are spirally formed on one surface with a track pitch of 0.32 m.
  • a disk-shaped substrate 2 a reflective layer 5 formed on one surface of the substrate, a recording layer 6 formed on the reflective layer 5, and a thickness formed on the recording layer 6
  • a protective layer 9 made of a transparent inorganic material is formed between the recording layer 6 and the light transmission layer as necessary.
  • the substrate 2 is a resin substrate having a thickness of 1.1 mm and a diameter of 12 O mm.
  • various materials used as substrate materials for conventional optical information recording media can be arbitrarily selected and used. 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, glass, etc. These may be mentioned, and these may be used together if necessary.
  • 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.
  • Group 3 is formed with a track pitch of 0.32 jt m. Since the substrate 2 does not need to transmit light in particular, it may be formed of a material other than a light transmitting material.
  • the reflective layer 5 is formed of a highly reflective metal thin film such as Au, Ag, AI, or an alloy thereof, and is formed by vapor deposition or sputtering.
  • the recording layer 6 includes an organic material-based recording layer using a dye and an inorganic material-based recording layer using an inorganic material.
  • the organic material-based recording layer is formed by applying a solution such as a azo dye or a cyanine dye dissolved in, for example, a TFP (tetrafluoroethylene) solution by a spin coating method.
  • the inorganic material type recording layer is formed by depositing Te—Pd, S i to Cu, G e —B i or the like by vapor deposition or sputtering.
  • Inorganic materials The material-based recording layer is formed so as to be sandwiched between two dielectric thin films (for example, ZnS 2 S i 0 2 etc.) in order to improve light absorption.
  • an organic material-based BD-R employs an In Groove recording method in which a pitch is formed on the recording layer 6 formed on the group 3.
  • I n G roo Ve recording method laser light having a wavelength of 40 nm is applied to a concave portion having a width of 160 nm that is smaller than the wavelength, so that recording is performed in a state where the diffraction limit is exceeded. For this reason, the recording characteristics are easily affected by the disorder of the spot shape of the laser beam.
  • the recording layer 6 is based on an inorganic material, it is formed by vapor deposition or sputtering. Therefore, as shown in FIG. 4, the thickness of the recording layer 6 formed on the group 3 and the recording layer 6 formed on the land 4 Are substantially the same thickness.
  • the inorganic material BD-R employs the OnGrooVe recording method in which the pitch is formed on the recording layer 6 formed on the land 4. In the OnGroove recording method, since the recording layer 6 is convex with respect to the laser beam, the recording characteristics are relatively less affected by the irregular spot shape of the laser beam.
  • the light transmissive layer 7 is made of a light transmissive resin.
  • a curable resin that is cured by ultraviolet rays or radiation is formed to a thickness of 0.1 mm by a spin coating method or the like, and a light-transmitting resin sheet having a thickness of 0.1 mm is used as an adhesive. There is a method of pasting with etc.
  • the light transmittance of the light transmitting layer 7 is 0.1 mm, and when measured with a spectrophotometer using light having a wavelength of 45 nm, it is 70% or more, preferably 8 Oo / o or more. is there.
  • the dye contained in the recording layer 6 is diffused into the light transmitting layer 7 when the light transmitting layer 7 is formed, or the cured resin solvent for forming the light transmitting layer 7 is used.
  • a protective layer 9 made of an inorganic material is formed between the recording layer 6 and the light transmitting layer 7 in order to prevent a mixing phenomenon such as penetration of the solvent contained in the adhesive into the recording layer 6.
  • the protective layer 9 is composed of silicon oxide, particularly silicon dioxide, oxides such as zinc oxide, cerium oxide, and yttrium oxide; sulfides such as zinc sulfide and yttrium sulfide; nitrides such as silicon nitride; Silicon; a mixture of oxide and ion.
  • the protective layer 9 is formed by a method such as sputtering.
  • the hard coat layer 8 is formed of a mixture of a silicon-based or fluorine-based leveling agent and a curable resin that is cured by ultraviolet rays or radiation, and is formed by applying by a spin coating method.
  • Examples of the silicon leveling agent include a cross-linked type silicon leveling agent (for example, UCR-L 93 or Kyoeisha Chemical Co., Ltd. FS700).
  • Examples of the fluorine-based leveling agent include cross-linked fluorine-based leveling agents (for example, DIC F-48.2 and NOF F600).
  • examples of the curable resin include an acrylic nylon epoxy curable resin (for example, TYS-5503 manufactured by Nippon Kayaku).
  • the content of the leveling agent in the hard coat layer 8 is expressed by (amount of leveling agent) X 1 0 0 Z (amount of leveling agent + amount of curable resin). It is 0% to 3.0%, preferably 1.5% to 3.0%.
  • the leveling agent content is preferably 3.0% or less.
  • Such a hard coat layer 8 of the optical information recording medium 1 has a function of repelling sebum adhering as a fingerprint to form particles. The effect can be expressed by the contact angle with triolein used as a dispersion medium for artificial fingerprint liquid. And in the optical information recording medium 1 of the present invention, the contact angle is 50 ° or more, preferably 60 °. That's it.
  • Figure 2 shows the triolein adhering to the hard coat layer 8.
  • the triolein adhering to the hard coat layer 8 becomes particles with a diameter r.
  • the particle diameter r of the triolein particles is determined by the contact angle ⁇ between the hard coat layer 8 and the triolein because of the surface tension of triolein. And as the contact angle ⁇ increases, the particle diameter r decreases.
  • the triolein particles are attached to the hard coat layer 8 as follows.
  • an artificial fingerprint liquid is prepared by mixing 0.4 parts by weight of Kanto loam, 1 part by weight of triolein, and 10 parts by weight of methoxypropanol.
  • the triolein particles adhered to the hard coat layer 8 in this way have good recording characteristics even with BD-R in which the triolein particles remain attached if the maximum particle size is 15 ⁇ m or less. Is obtained.
  • the contact angle ⁇ at which the maximum particle size is 15 / m or less is 50 ° or more.
  • BD-R which is an organic material based on the In Gr ⁇ ⁇ Ve recording system
  • the conditions are more severe, so the maximum particle size of triolein particles is less than 10 m.
  • the contact angle ⁇ is over 60 °.
  • the effect of the present invention will be verified. First, a BD-R blank disc was prepared before the hard coat layer was formed.
  • a hard coating agent in which a silicone leveling agent: fluorine leveling agent is mixed at a weight ratio of 1: 1 and an acrylic UV curable resin is mixed. Prepared. Next, this hard coating agent is blanked by spin coating. It was applied onto the light transmission layer of the disc and then cured by irradiating with ultraviolet rays to form a hard coat layer.
  • the recording / reproduction characteristics were measured using ODU-1 000 manufactured by Pulstech Corporation, with a wavelength of 405 nm, a numerical aperture (NA) of 0.85, and a linear velocity of 4.92 mZs.
  • the recording / reproduction characteristics are set to 4.0 X 1 0 to 1 3 as a threshold value, and a value lower than this is set to pass.
  • the maximum particle size of the artificial fingerprint liquid (triolein) was measured with an attached micrometer by observing the largest particle diameter within a range of 12 mm with the artificial fingerprint liquid attached, using an optical microscope.
  • the contact angle was determined by dropping triolein (manufactured by Kanto Chemical Co.) 2. OjU I onto a BD-R disc and measuring the angle when the droplet was in an equilibrium state. CA-X type).
  • Invention Example 3 A hard coat layer was formed on the surface of a light transmitting layer of BD-1R having a recording layer of an inorganic material using a hard coat agent containing a 1.00 / 0 repelling agent. At this time, the hard coat layer had a contact angle with respect to triolein of 50 °. The symbol error rate of this BD-R was 2.0 X 1 0-3. The maximum particle size of triolein was 15 m.
  • Comparative Example 1 A hard coat layer was formed on the surface of a light transmitting layer of BD-R having an organic material type recording layer by using a hard coat agent containing 1.0% of a repelling agent. At this time, the hard coat layer had a contact angle with respect to triolein of 51 °. Symbol error rate of the BD- R was 1. 0 X 1 0 one 2. The maximum particle size of triolein was 15 m.
  • Comparative Example 2 A hard coat layer was formed on the surface of a light transmitting layer of BD-1R having an organic material type recording layer by using a hard coat agent containing 0.5% of a leveling agent.
  • the hard coat layer at this time had a contact angle with respect to triolein of 42 °.
  • Symbol error rate of the BD- R was 5. 0 X 1 0 one 2.
  • the maximum particle size of triolein was 20 m .
  • the hard coat layer has a contact angle with triolein of 50 ° or more, preferably 60 ° or more, it is possible to obtain a BD-R that can obtain good recording characteristics even with a fingerprint attached. it can.

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  • Manufacturing & Machinery (AREA)
  • Manufacturing Optical Record Carriers (AREA)
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Abstract

An optical information recording medium exhibiting a favorable recording characteristic even if recording is carried out while a fingerprint is on the surface of the light-transmitting layer. The optical information recording medium (1) includes a recording layer (6) and a light-transmitting layer (7) transmitting a recording laser beam and a reproducing laser beam directed to the recording layer (6). A hard-coat layer (8) is formed on the surface of the light-transmitting layer (7) and is formed of a resin the angle of contact of which with triolein on the hard coat is 50° or more, preferably 60° or more.

Description

明細書  Specification
光情報記録媒体及びその製造方法 Optical information recording medium and manufacturing method thereof
技術分野  Technical field
本発明は、 特に高記録密度の追記型の光情報記録媒体において、 指紋の 付着による記録特性への影響を低減することが可能な光情報記録媒体とそ の製造方法に関するものである。 背景技術  The present invention relates to an optical information recording medium capable of reducing the influence on the recording characteristics due to adhesion of a fingerprint, particularly in a write-once type optical information recording medium having a high recording density, and a method for manufacturing the same. Background art
追記型 CD (CD-R) 、 追記型 DVD (DVD±R) または追記型ブ ルーレイディスク （BD— R) 等の光情報記録媒体すなわち光ディスクは、 ディスク状基板の一方の面上に、 記録層、 反射層、 及び必要に応じて保護 層を形成した構造を有している。 また、 記録層や反射層が形成されている 側の前記基板の面上にはグループと呼ばれる螺旋状または同心円状の溝が 形成され、 隣り合うグループの間はランドと呼ばれる凸部となっている。 このような光ディスクは、 記録用レーザ光をグループ上の記録層に照射し てピットを形成することにより記録が行われる。 このピットの長さ、 ピッ 卜とピットの間の部分 （以下スペースと言う。 ） の長さ及びこれらの配列 を、 再生用レーザ光を照射して反射光を再生信号として読み取ることによ つて再生が行われる。  An optical information recording medium such as write-once CD (CD-R), write-once DVD (DVD ± R) or write-once Blu-ray disc (BD-R), that is, an optical disc, has a recording layer on one side of the disc-shaped substrate. It has a structure in which a reflective layer and, if necessary, a protective layer are formed. In addition, spiral or concentric grooves called groups are formed on the surface of the substrate on the side where the recording layer and the reflective layer are formed, and convex portions called lands are formed between adjacent groups. . In such an optical disc, recording is performed by irradiating a recording layer on the recording layer with a recording laser beam to form pits. The length of the pit, the length between the pitch and the pit (hereinafter referred to as the space), and their arrangement are reproduced by irradiating the reproduction laser beam and reading the reflected light as a reproduction signal. Is done.
このような光ディスクは、 記録用レーザ光及び再生用レーザ光が光透過 層を通して記録層に照射される。 ここで光透過層は、 CD— Rや DVD土 Rの場合は光透過性のディスク状基板 （厚さは CD— Rの場合 1. 2mm、 0 0±1¾の場合0. 6mm) の上に記録層、 反射層が順次形成された構 造を有するので、 光透過性のディスク状基板が光透過層に相当する。 また、 BD— Rの場合は厚さ 1. 1 mmのディスク状基板の上に反射層、 記録層 が順次形成され、 記録層上に厚さ 0. 1 mmの透明のカバー層が形成され た構造を有するので、 透明のカバー層が光透過層に相当する。  In such an optical disc, the recording laser beam and the reproducing laser beam are irradiated to the recording layer through the light transmission layer. Here, the light-transmitting layer is on a light-transmitting disc-shaped substrate (thickness is 1.2 mm for CD-R, 0.6 mm for 0 0 ± 1¾) for CD-R and DVD soil R. Since it has a structure in which the recording layer and the reflective layer are sequentially formed, the light-transmitting disk-shaped substrate corresponds to the light-transmitting layer. In the case of BD-R, a reflective layer and a recording layer were sequentially formed on a disk substrate having a thickness of 1.1 mm, and a transparent cover layer having a thickness of 0.1 mm was formed on the recording layer. Since it has a structure, the transparent cover layer corresponds to the light transmission layer.
また、 BD— Rの場合は、 ピットを形成する位置の違いから、 ディスク 状基板のランド上に形成された記録層にピットを形成する O n G r o o V e記録方式と、 ディスク状基板のグルーブ上に形成された記録層にピット を形成する I n G r o o V e記録方式の、 2種類の記録方式がある。 O n G r o o V e記録方式は記録層に無機材料を用いた BD— Rに採用されて おり、 I n G r o o V e記録方式は記録層に有機色素を用いた B D— Rに 採用されている。  In addition, in the case of BD-R, due to the difference in the positions where pits are formed, an On Groo Ve recording method for forming pits in the recording layer formed on the land of the disk-shaped substrate, and a groove on the disk-shaped substrate. There are two types of recording methods: IngroVe recording method that forms pits in the recording layer formed above. The On Gro Ve Ve recording method is used for BD-R, which uses an inorganic material for the recording layer, and the In Gro Gro Ve recording method is used for BD—R, which uses an organic dye for the recording layer. Yes.
このような光ディスクは、 レーザ光が入射される光透過層の表面に傷や 指紋等が付いたりすると、 レーザ光のスポット形状に乱れが生じて、 記録 品質が低下してしまうことがある。 特に D V D土 Rや B D— Rのような高 密度記録の光ディスクではその影響が顕著である。 そこで、 光透過層表面 にハードコート層を形成した光ディスクが製品化されている。 このハード コー卜層は、 光透過層を構成する材料よリも硬い光透過性の材料を用いて いるため、 光透過層は傷が付きにくくなる。 In such an optical disc, if the surface of the light transmitting layer on which the laser beam is incident is scratched or fingerprinted, the spot shape of the laser beam may be disturbed, and the recording quality may deteriorate. This effect is particularly noticeable in high-density recording optical discs such as DVD SAT R and BD-R. Therefore, the surface of the light transmission layer An optical disc having a hard coat layer formed thereon is commercialized. Since this hard coat layer uses a light-transmitting material that is harder than the material constituting the light-transmitting layer, the light-transmitting layer is less likely to be damaged.
また、 指紋に対する耐性については、 光透過層表面に人工指紋を付着させ て拭き取ったときの記録特性 （例えばジッター特性） がエラーの生じない レベルになるような光ディスクが特開 2 0 0 5 - 0 1 1 4 4 7号公報に開 示されている。 As for the resistance to fingerprints, an optical disc whose recording characteristics (for example, jitter characteristics) when an artificial fingerprint is attached to the surface of the light transmission layer and wiped off is at a level that does not cause an error is disclosed in Japanese Patent Laid-Open No. 1 1 4 4 7 Published in the gazette.
特許文献 1 特開 2 0 0 5— 0 1 1 4 4フ号公報 発明の開示  Patent Document 1 Japanese Patent Laid-Open No. 2 0 0 5-0 0 1 1 4 4
発明が解決しょうとする課題  Problems to be solved by the invention
しかしながら、 特許文献 1に開示されている光ディスクは、 付着した指 紋を拭き取ることを前提にしている。 このような光ディスクでは、 指紋を 拭き取るときに、 光透過層の表面またはハードコ一ト層の表面に傷をつけ てしまうおそれがある。 光透過層の表面またはハードコート層の表面に傷 をつけた場合、 その部分においてレーザ光のスポット形状に乱れが生じ、 記録特性の低下が発生する。 これは B D— Rのような高密度記録の光ディ スクではその影響が大きいものである。  However, the optical disk disclosed in Patent Document 1 is premised on wiping off the attached fingerprints. In such an optical disc, when the fingerprint is wiped off, the surface of the light transmission layer or the surface of the hard coat layer may be damaged. When the surface of the light transmission layer or the surface of the hard coat layer is scratched, the spot shape of the laser beam is disturbed at that portion, and the recording characteristics are deteriorated. This is a significant effect on high-density recording optical discs such as BD-R.
さらに、 記録層に有機色素を用いた B D— Rの場合、 I n G r o o V e 記録方式を採用しているため、 その影響が大きくなる。 これは、 レーザ光 の波長が 4 0 5 η で、 グループの幅が 0 . 1 6 μ m程度なので、 回折限 界を超えた状態で記録を行うため、 O n G r o o V e記録方式に比べてレ 一ザ光のスポット形状の乱れの影響がよリ大きくなるためである。  In addition, in the case of BD-R using an organic dye in the recording layer, the effect is increased because the In G roo Ve recording method is adopted. This is because the wavelength of the laser beam is 4 05 η and the width of the group is about 0.16 μm, so recording is performed in a state that exceeds the diffraction limit. This is because the influence of the disorder of the spot shape of the laser light becomes larger.
そこで本発明では、 このような課題を解決して、 指紋が付着したままで も良好な記録特性を得ることが可能な光情報記録媒体を提供する。  Accordingly, the present invention provides an optical information recording medium that can solve such problems and can obtain good recording characteristics even with fingerprints attached.
課題を解決するための手段  Means for solving the problem
発明者らは、 鋭意検討の結果、 指紋として付着した皮脂が所定の粒子径 以下であれば記録特性に影響しないことを見出した。 そこで本発明では第 一の解決手段として、 記録層と、 該記録層に照射されるレーザ光が通過す る光透過層と、 を有する光情報記録媒体において、 前記光透過層の表面に ハードコート層が形成されており、 前記ハードコート層は、 硬化被膜上に おける粒子状のトリオレインとの接触角が 5 0 ° 以上となる樹脂である光 情報記録媒体を提案する。  As a result of intensive studies, the inventors have found that the recording properties are not affected if the sebum attached as a fingerprint is equal to or smaller than a predetermined particle size. Therefore, in the present invention, as a first solution, an optical information recording medium comprising: a recording layer; and a light transmitting layer through which the laser light applied to the recording layer passes. A hard coat is applied to the surface of the light transmitting layer. An optical information recording medium is proposed in which the hard coat layer is a resin having a contact angle with particulate triolein on the cured film of 50 ° or more.
トリオレインは、 人工指紋液の分散媒として用いられているもので、 ハ 一ドコート層表面におけるトリオレインを分散媒とする人工指紋を付着さ せた状態は、 実際の指紋の付着状態に近いものである。 このトリオレイン の最大粒子径が 1 5 / m以下であれば、 指紋が付着したままの状態でも良 好な記録特性が得られる。 上記第一の解決手段によれば、 トリオレインを 分散媒とする人工指紋液付着時の最大粒子径が 1 5 U m以下になるので、 指紋が付着したままでも良好な記録特性を得ることができる。 なお、 「硬 化被膜図図図図あ上におけるトリオレインとの接触角」 とは、 図 2に示すように、 ト リォレインの粒子の頂点 Tとトリオレインの粒子の端点 Aから液滴の直径 ( r ) と高さ （h ) を求め、 式 （A) 、 および、 式 （B ) より算出できる 接触角ぴである。 Triolein is used as a dispersion medium for artificial fingerprint liquids, and the state where artificial fingerprints using triolein as a dispersion medium on the surface of the hard coat layer are attached is close to the actual state of adhesion of fingerprints. It is. If the maximum particle size of this triolein is 15 / m or less, good recording characteristics can be obtained even with the fingerprint still attached. According to the first solution described above, the maximum particle size when adhering an artificial fingerprint liquid using triolein as a dispersion medium is 15 Um or less, so that good recording characteristics can be obtained even with a fingerprint still attached. it can. "Hard As shown in Fig. 2, the contact angle with triolein on the top of the chemical coating diagram is the diameter (r) of the droplet from the apex T of the triolein particle and the end point A of the triolein particle. The contact angle is calculated from the formula (A) and the formula (B) after obtaining the height (h).
t a η σ τ = 2 h r ■ ■ ' ( A)  t a η σ τ = 2 h r ■ ■ '(A)
σ = 2 t a n一1 ( 2 h / r ) ■ ■ ■ ( B ) σ = 2 tan 1 (2 h / r) ■ ■ ■ (B)
この接触角は、 接触角計 （例えば協和界面科学 （株） 製 C A- X型） を用 いることによつて測定することができる。 This contact angle can be measured by using a contact angle meter (for example, C A-X type manufactured by Kyowa Interface Science Co., Ltd.).
また、 本発明では第二の解決手段として、 上記第一の解決手段に加えて、 前記ハードコート層が、 硬化被膜上におけるトリオレインとの接触角が 6 0 ° 以上となる樹脂である光情報記録媒体を提案する。 接触角が 6 0 ° 以 上であれば、 トリオレインを分散媒とする人工指紋液付着時の最大粒子径 が 1 O jW m以下となる。 このレベルであれば、 I n G r o o V e記録方式 を採用している有機色素系の B D— Rにおいても指紋が付着したままの状 態でも良好な記録特性を得ることができる。 Further, in the present invention, as a second solving means, in addition to the first solving means, the hard coat layer is an optical information which is a resin having a contact angle with triolein on the cured film of 60 ° or more. Propose a recording medium. If the contact angle is 60 ° or more, the maximum particle size when adhering artificial fingerprint liquid using triolein as a dispersion medium is 1 O jW m or less. At this level, it is possible to obtain good recording characteristics even in the state in which the fingerprint remains attached even in the organic dye-based BD-R adopting the InGrooVe recording method.
また、 このハードコート層は、 シリコン系またはフッ素系のレべリング剤 を含んでいる樹脂で形成されている。 この樹脂に含まれるレペリング剤の 量を多くするほどトリオレインとの接触角が大きくなる。 レべリング剤の 含有量が 1 . 0 %~ 3 . 0 %であれば接触角が 5 0。 以上、 好ましくは 1 . 5 %~ 3 . 0 %であれば接触角が 6 0 ° 以上となる。 なお、 シリコン系の レべリング剤とフッ素系のレべリング剤は、 単独で用いても良いし、 混合 して用いても良い。 The hard coat layer is formed of a resin containing a silicon-based or fluorine-based leveling agent. As the amount of the repelling agent contained in this resin increases, the contact angle with triolein increases. When the leveling agent content is 1.0% to 3.0%, the contact angle is 50. As described above, preferably, the contact angle is 60 ° or more when it is 1.5% to 3.0%. The silicon leveling agent and the fluorine leveling agent may be used alone or in combination.
また、 このようなハードコート層は、 硬化被膜上におけるトリオレインと の接触角が 5 0 ° 以上好ましくは 6 0 ° 以上となる樹脂材料を、 スピンコ 一卜法によって塗布して形成することができる。 Further, such a hard coat layer can be formed by applying a resin material having a contact angle with triolein on a cured coating of 50 ° or more, preferably 60 ° or more, by a spin-collision method. .
明の効里  Akira no Eri
本発明の光情報記録媒体は指紋が付着したままの状態でも良好な記録特 性が得られる。 このような光情報記録媒体は、 指紋を拭き取る必要がない ので、 指紋のふき取り時に光透過層またはハードコ一ト層に傷をつけるお それが少なくなる。 図面の簡単な説明  The optical information recording medium of the present invention can provide good recording characteristics even with a fingerprint still attached. Since such an optical information recording medium does not require the fingerprint to be wiped off, there is less possibility of scratching the light transmission layer or the hard coat layer when the fingerprint is wiped off. Brief Description of Drawings
1 光情報記録媒体の断面の一部を拡大して模式的に示す部分断面 る。  1 A partial cross section schematically showing an enlarged part of a cross section of an optical information recording medium.
2 ハードコート層上のトリオレインの状態を示す模式図である。  2 is a schematic diagram showing the state of triolein on the hard coat layer.
3 I n G r o o V e記録方式を説明するための模式断面図である。  FIG. 3 is a schematic cross-sectional view for explaining a 3 InG rooVe recording method.
4 O n G r o o V e記録方式を説明するための模式断面図である。 符号の説明  FIG. 4 is a schematic cross-sectional view for explaining a 4 OnGrooVe recording method. Explanation of symbols
1 光情報記録媒体  1 Optical information recording media
2 基板 記光ハ保反グラ 2 Board Recording light
透ル録護射ン  Transparent record shooting
一 _p _pー罾咼ドド  One _p _p
層ブ Π  Stratum Π
発明を実施するための最良の形態 BEST MODE FOR CARRYING OUT THE INVENTION
本発明の光情報記録媒体にかかる実施の形態について、 8りー[¾の場合 を例にとって、 図面に基づいて説明する。 図 1に示す光情報記録媒体 1は、 一方の面に幅 0 . 1 6 i mのグループ 3及びランド 4がトラックピッチ 0 . 3 2 mで螺旋状に形成されている厚さ 1 . 1 mmのディスク状の基板 2 と、 該基板の一方の面上に形成された反射層 5と、 該反射層 5の上に形成 された記録層 6と、 該記録層 6上に形成された厚さ 0 . 1 mmの光透過層 7と、 該光透過層 7上に形成されたハードコート層 8と、 を有する。 また、 必要に応じて記録層 6と光透過層つとの間に透明の無機材料で構成された 保護層 9が形成される。  An embodiment of the optical information recording medium of the present invention will be described with reference to the drawings, taking the case of 8 [3] as an example. An optical information recording medium 1 shown in FIG. 1 has a thickness of 1.1 mm, in which a group 3 and a land 4 having a width of 0.16 im are spirally formed on one surface with a track pitch of 0.32 m. A disk-shaped substrate 2, a reflective layer 5 formed on one surface of the substrate, a recording layer 6 formed on the reflective layer 5, and a thickness formed on the recording layer 6 A 1 mm light transmission layer 7 and a hard coat layer 8 formed on the light transmission layer 7. Further, a protective layer 9 made of a transparent inorganic material is formed between the recording layer 6 and the light transmission layer as necessary.
基板 2は、 厚さが 1 . 1 mmを有する直径 1 2 O mmの樹脂製の基板で ある。 この基板 2には、 従来の光情報記録媒体の基板材料として用いられ ている各種の材料を任意に選択して使用することができる。 具体的には、 ポリカーボネート、 ポリメチルメタクリレート等のアクリル樹脂、 ポリ塩 化ビニル、 塩化ビニル共重合体等の塩化ビニル系樹脂、 エポキシ樹脂、 ァ モルファスポリオレフイン、 ポリエステル樹脂、 アルミニウム等の金属、 ガラス等を挙げることができ、 必要によりこれらを併用してもよい。 上記 材料の中では、 成型性、 耐湿性、 寸法安定性及び低価格等の点から熱可塑 性樹脂が好ましく、 ポリカーボネートが特に好ましい。 このような基板 2 は、 射出成形によって形成される。 このとき、 金型内にスタンパがセット されておリ、 これによつて基板 2に螺旋状のグルーブ 3及びランド 4が形 成される。 このグループ 3は 0 . 3 2 jt mのトラックピッチで形成されて いる。 なお、 この基板 2は特に光を透過する必要がないので、 光透過性の 材料以外で形成しても良い。  The substrate 2 is a resin substrate having a thickness of 1.1 mm and a diameter of 12 O mm. For this substrate 2, various materials used as substrate materials for conventional optical information recording media can be arbitrarily selected and used. 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, glass, etc. These may be mentioned, and these may be used together if necessary. Among the above materials, 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. At this time, a stamper is set in the mold, and thereby, spiral grooves 3 and lands 4 are formed on the substrate 2. Group 3 is formed with a track pitch of 0.32 jt m. Since the substrate 2 does not need to transmit light in particular, it may be formed of a material other than a light transmitting material.
反射層 5は、 A u、 A g、 A Iあるいはこれらの合金等の反射率の高い 金属薄膜で形成されており、 蒸着またはスパッタリング等によって形成さ れる。 記録層 6は、 色素を用いた有機材料系の記録層と、 無機材料を用い た無機材料系の記録層とがある。 有機材料系の記録層は、 ァゾ系色素ゃシ ァニン系色素等の色素を例えば T F P (テトラフル才ロプロパノール） 溶 液に溶かしたものをスピンコート法で塗布することによって形成される。 無機材料系の記録層は、 T e— P d、 S i ~ C u , G e—B i等を蒸着ま たはスパッタリング等で成膜することによって形成される。 なお、 無機材 料系の記録層は、 光吸収性を良好にするため、 2つの誘電体薄膜 （例えば Z n S ■ S i 0 2等） で挟むようにして形成される。 The reflective layer 5 is formed of a highly reflective metal thin film such as Au, Ag, AI, or an alloy thereof, and is formed by vapor deposition or sputtering. The recording layer 6 includes an organic material-based recording layer using a dye and an inorganic material-based recording layer using an inorganic material. The organic material-based recording layer is formed by applying a solution such as a azo dye or a cyanine dye dissolved in, for example, a TFP (tetrafluoroethylene) solution by a spin coating method. The inorganic material type recording layer is formed by depositing Te—Pd, S i to Cu, G e —B i or the like by vapor deposition or sputtering. Inorganic materials The material-based recording layer is formed so as to be sandwiched between two dielectric thin films (for example, ZnS 2 S i 0 2 etc.) in order to improve light absorption.
記録層 6が有機材料系の場合、 スピンコート法で形成するため、 図 3に 示すように、 グループ 3上に形成された記録層 6の厚みがランド 4上に形 成された記録層 6の厚みよりも厚くなる。 そこで有機材料系の B D— Rで は、 ピッ卜がグループ 3上に形成された記録層 6に形成される I n G r o o v e記録方式が採用されている。 I n G r o o V e記録方式は、 波長 4 0 5 n mのレーザ光を、 波長よリも小さい幅 1 6 0 n mの凹部に照射する ので、 回折限界を超えた状態で記録が行われる。 そのため、 記録特性がレ 一ザ光のスポット形状の乱れに影響されやすい。  When the recording layer 6 is an organic material system, the recording layer 6 is formed by spin coating, so that the thickness of the recording layer 6 formed on the group 3 is the thickness of the recording layer 6 formed on the land 4 as shown in FIG. Thicker than the thickness. Therefore, an organic material-based BD-R employs an In Groove recording method in which a pitch is formed on the recording layer 6 formed on the group 3. In the I n G roo Ve recording method, laser light having a wavelength of 40 nm is applied to a concave portion having a width of 160 nm that is smaller than the wavelength, so that recording is performed in a state where the diffraction limit is exceeded. For this reason, the recording characteristics are easily affected by the disorder of the spot shape of the laser beam.
一方記録層 6が無機材料系の場合、 蒸着またはスパッタリングで形成す るため、 図 4に示すように、 グループ 3上に形成された記録層 6の厚みと ランド 4上に形成された記録層 6の厚みが略同じになる。 そこで無機材料 系の B D— Rでは、 ピッ卜がランド 4上に形成された記録層 6に形成され る O n G r o o V e記録方式が採用されている。 O n G r o o v e記録方 式では、 記録層 6がレーザ光に対して凸部になっているので、 記録特性が レーザ光のスポット形状の乱れに対して比較的影響されにくい。  On the other hand, when the recording layer 6 is based on an inorganic material, it is formed by vapor deposition or sputtering. Therefore, as shown in FIG. 4, the thickness of the recording layer 6 formed on the group 3 and the recording layer 6 formed on the land 4 Are substantially the same thickness. In view of this, the inorganic material BD-R employs the OnGrooVe recording method in which the pitch is formed on the recording layer 6 formed on the land 4. In the OnGroove recording method, since the recording layer 6 is convex with respect to the laser beam, the recording characteristics are relatively less affected by the irregular spot shape of the laser beam.
光透過層 7は、 光透過性の樹脂で形成されている。 形成方法としては、 紫外線または放射線によって硬化する硬化性樹脂をスピンコート法等によ つて厚さ 0 . 1 mmに形成する方法と、 厚さ 0 . 1 mmの光透過性の樹脂 シートを接着剤等で貼り付ける方法と、 がある。 この光透過層 7の光透過 率は、 厚み 0 . 1 mmで、 4 0 5 n mの波長の光にて分光光度計で測定し たときに 7 0 %以上好ましくは 8 O o/o以上である。 なお、 記録層 6が有機 材料系の場合、 光透過層 7の成膜時における記録層 6に含まれる色素の光 透過層 7への拡散や、 光透過層 7の形成用の硬化樹脂の溶剤または接着剤 に含まれる溶剤等の記録層 6への浸透などの混和現象を防止するため、 記 録層 6と光透過層 7との間に無機材料の保護層 9を形成する。 この保護層 9を構成する材料は、 酸化珪素とくに二酸化珪素や、 酸化亜鉛、 酸化セリ ゥ厶、 酸化ィットリゥム等の酸化物；硫化亜鉛、 硫化ィットリゥムなどの 硫化物；窒化珪素などの窒化物；炭化珪素；酸化物とィォゥとの混合物な どが挙げられる。 この保護層 9は、 スパッタリング等の方法で形成される。 ハードコート層 8は、 シリコン系またはフッ素系のレべリング剤と、 紫 外線または放射線等によって硬化する硬化性樹脂との混合物で形成されて おり、 スピンコート法で塗布して形成される。 シリコン系のレべリング剤 としては、 架橋型シリコン系レべリング剤 （例えば共栄社化学製 U C R— L 9 3や日油製 F S 7 0 0 ) 等が挙げられる。 フッ素系のレべリング剤と しては架橋型フッ素系レべリング剤 （例えば D I C製 F— 4 8 2や日油製 F 6 0 0 ) 等が挙げられる。 また、 硬化性樹脂としては、 アクリル系ゃェ ポキシ系紫外線硬化樹脂 （例えば日本化薬製 T Y S— 5 0 3 ) 等が挙げら れる。 ハードコ一ト層 8中のレべリング剤の含有量は、 （レべリング剤の 量） X 1 0 0 Z (レべリング剤の量 +硬化性樹脂の量） で表したとき、 1 . 0 %〜3 . 0 %、 好ましくは 1 . 5 %〜 3 . 0 %である。 3 . 0 %を超え る含有量ではハードコート層表面におけるレべリング剤の割合が多くなリ すぎるため耐磨耗性の劣化が生じ、 ハードコート層としての機能を果たさ なくなる。 そのためレべリング剤の含有量は 3 . 0 %以下が好ましい。 このような光情報記録媒体 1のハードコート層 8は、 指紋として付着し た皮脂をはじいて粒子状にする作用を有する。 その作用は、 人工指紋液の 分散媒として用いられるトリオレインとの接触角で表すことができる。 そ して本発明の光情報記録媒体 1では、 接触角が 5 0 ° 以上好ましくは 6 0。 以上となる。 ハードコート層 8上にトリオレインが付着している様子 を図 2に示す。 The light transmissive layer 7 is made of a light transmissive resin. As a forming method, a curable resin that is cured by ultraviolet rays or radiation is formed to a thickness of 0.1 mm by a spin coating method or the like, and a light-transmitting resin sheet having a thickness of 0.1 mm is used as an adhesive. There is a method of pasting with etc. The light transmittance of the light transmitting layer 7 is 0.1 mm, and when measured with a spectrophotometer using light having a wavelength of 45 nm, it is 70% or more, preferably 8 Oo / o or more. is there. When the recording layer 6 is an organic material system, the dye contained in the recording layer 6 is diffused into the light transmitting layer 7 when the light transmitting layer 7 is formed, or the cured resin solvent for forming the light transmitting layer 7 is used. Alternatively, a protective layer 9 made of an inorganic material is formed between the recording layer 6 and the light transmitting layer 7 in order to prevent a mixing phenomenon such as penetration of the solvent contained in the adhesive into the recording layer 6. The protective layer 9 is composed of silicon oxide, particularly silicon dioxide, oxides such as zinc oxide, cerium oxide, and yttrium oxide; sulfides such as zinc sulfide and yttrium sulfide; nitrides such as silicon nitride; Silicon; a mixture of oxide and ion. The protective layer 9 is formed by a method such as sputtering. The hard coat layer 8 is formed of a mixture of a silicon-based or fluorine-based leveling agent and a curable resin that is cured by ultraviolet rays or radiation, and is formed by applying by a spin coating method. Examples of the silicon leveling agent include a cross-linked type silicon leveling agent (for example, UCR-L 93 or Kyoeisha Chemical Co., Ltd. FS700). Examples of the fluorine-based leveling agent include cross-linked fluorine-based leveling agents (for example, DIC F-48.2 and NOF F600). Further, examples of the curable resin include an acrylic nylon epoxy curable resin (for example, TYS-5503 manufactured by Nippon Kayaku). The content of the leveling agent in the hard coat layer 8 is expressed by (amount of leveling agent) X 1 0 0 Z (amount of leveling agent + amount of curable resin). It is 0% to 3.0%, preferably 1.5% to 3.0%. If the content exceeds 3.0%, the ratio of the leveling agent on the surface of the hard coat layer is too high, resulting in deterioration of the wear resistance and failing to function as a hard coat layer. Therefore, the leveling agent content is preferably 3.0% or less. Such a hard coat layer 8 of the optical information recording medium 1 has a function of repelling sebum adhering as a fingerprint to form particles. The effect can be expressed by the contact angle with triolein used as a dispersion medium for artificial fingerprint liquid. And in the optical information recording medium 1 of the present invention, the contact angle is 50 ° or more, preferably 60 °. That's it. Figure 2 shows the triolein adhering to the hard coat layer 8.
ハードコート層 8に付着したトリオレインは、 直径 rの粒子状になる。 このトリオレインの粒子の粒子径 rは、 トリオレインの表面張力の関係か ら、 ハードコート層 8とトリオレインとの接触角 σで決定される。 そし て、 接触角 σが大きくなるほど粒子径 rは小さくなる。  The triolein adhering to the hard coat layer 8 becomes particles with a diameter r. The particle diameter r of the triolein particles is determined by the contact angle σ between the hard coat layer 8 and the triolein because of the surface tension of triolein. And as the contact angle σ increases, the particle diameter r decreases.
なお、 トリオレインの粒子は、 以下のようにしてハードコート層 8に付 着させる。 （1 ) まず、 0 . 4重量部の関東ロームと、 1重量部のトリオ レインと、 1 0重量部のメトキシプロパノールとを混合して人工指紋液を 作成する。 （2 ) この人工指紋液を 1 m I採取して、 直径 1 2 O m mのポ リカーボネート基板上にスピンコート法で塗布し、 初めの 3秒間を 5 0 0 r p m、 その後の 3秒間を 2 5 0 r p mで回転させて塗膜を形成する。  The triolein particles are attached to the hard coat layer 8 as follows. (1) First, an artificial fingerprint liquid is prepared by mixing 0.4 parts by weight of Kanto loam, 1 part by weight of triolein, and 10 parts by weight of methoxypropanol. (2) Collect 1 m I of this artificial fingerprint solution and apply it onto a polycarbonate substrate with a diameter of 12 O mm by spin coating. The first 3 seconds is 500 rpm and the next 3 seconds is 2 Rotate at 50 rpm to form a coating film.
( 3 ) これを 6 0 °C、 3分間乾燥して人工指紋用の膜を形成する。 （4 ) 次いで直径 1 2 m mのシリコーンゴムの端面を、 J I S R 6 2 5 2に規 定された基材 C w、 研磨材 A、 粒度 P 2 4 0の研磨紙で研磨した擬似指紋 転写材を用意する。 （5 ) この擬似指紋転写材の端面を、 荷重 2 9 Nで 1 0秒間人工指紋用の膜に押し当てて、 人工指紋液を転写する。 （6 ) 次い で人工指紋液を転写した擬似指紋転写材をハードコート層 8に荷重 2 9 N で 1 0秒間押し当てて、 人工指紋液を付着させる。 付着させた人工指紋液 はハードコート層 8にはじかれてトリオレインの粒子となる。  (3) This is dried at 60 ° C for 3 minutes to form a film for artificial fingerprints. (4) Next, a pseudo-fingerprint transfer material obtained by polishing the end face of silicone rubber having a diameter of 12 mm with a base paper C w, abrasive material A, and abrasive paper with a particle size P 2 40 specified in JISR 6 2 52 prepare. (5) The artificial fingerprint liquid is transferred by pressing the end face of the pseudo-fingerprint transfer material against the artificial fingerprint film with a load of 29 N for 10 seconds. (6) Next, the artificial fingerprint liquid transferred from the artificial fingerprint liquid is pressed against the hard coat layer 8 under a load of 29 N for 10 seconds to adhere the artificial fingerprint liquid. The attached artificial fingerprint liquid is repelled by the hard coat layer 8 and becomes triolein particles.
このようにしてハードコート層 8に付着させたトリオレインの粒子は、 最大粒子径が 1 5 μ m以下であれば、 トリオレインの粒子が付着したまま の状態の B D— Rでも良好な記録特性が得られる。 最大粒子径が 1 5 / m 以下になる接触角 σは、 5 0 ° 以上となる。 なお、 I n G r ο ο V e記 録方式の有機材料系の B D— Rでは、 条件がよリ厳しいものとなるため、 トリオレインの粒子の最大粒子径は 1 0 m以下になり、 そのときの接触 角 σは 6 0 ° 以上となる。 次に本発明の効果について検証する。 まず、 ハードコート層を形成する 前の B D— Rのブランクディスクを用意した。 次にシリコン系のレペリン グ剤：フッ素系のレべリング剤が重量比で 1 ： 1の割合で混合されたレべ リング剤と、 アクリル系の紫外線硬化樹脂と、 を混合したハードコート剤 を用意した。 次にこのハードコ一ト剤をスピンコート法によってブランク ディスクの光透過層上に塗布し、 その後紫外線を照射して硬化させ、 ハー ドコート層を形成した。 The triolein particles adhered to the hard coat layer 8 in this way have good recording characteristics even with BD-R in which the triolein particles remain attached if the maximum particle size is 15 μm or less. Is obtained. The contact angle σ at which the maximum particle size is 15 / m or less is 50 ° or more. In the case of BD-R, which is an organic material based on the In Gr ο ο Ve recording system, the conditions are more severe, so the maximum particle size of triolein particles is less than 10 m. The contact angle σ is over 60 °. Next, the effect of the present invention will be verified. First, a BD-R blank disc was prepared before the hard coat layer was formed. Next, a hard coating agent in which a silicone leveling agent: fluorine leveling agent is mixed at a weight ratio of 1: 1 and an acrylic UV curable resin is mixed. Prepared. Next, this hard coating agent is blanked by spin coating. It was applied onto the light transmission layer of the disc and then cured by irradiating with ultraviolet rays to form a hard coat layer.
この BD— Rの光透過層表面に、 上記 （1) ~ (6) に記載されている 手順によって人工指紋液を付着させた。 次に、 人工指紋液を付着させたま まの B D— Rのブランクディスクにデータ記録を行い、 記録 Z再生特性 An artificial fingerprint liquid was adhered to the surface of the light transmission layer of BD-R by the procedure described in (1) to (6) above. Next, data was recorded on a B D-R blank disc with the artificial fingerprint liquid attached, and the recorded Z playback characteristics were recorded.
(シンボルエラーレート） を測定した。 記録 再生特性はパルステックェ 業 （株） 製 ODU— 1 000を用い、 波長 405 nm、 開口数 （N A) 0. 85、 線速 4. 92mZsで測定した。 なお、 記録 再生特性は、 4. 0 X 1 0一3を閾値とし、 これより低い値を合格とする。 また、 人工指紋液 (トリオレイン） の最大粒子径は、 人工指紋液の付着した直径 1 2 mmの 範囲内で最も大きいものを光学顕微鏡で覩察して、 付属のマイクロメータ によって測定した。 また、 接触角は、 BD— Rディスク上にトリオレイン (関東化学製） を 2. OjU I滴下し、 液滴が平衡状態となった際の角度を 接触角計 （協和界面科学 （株） 製 CA- X型） で測定した。 (Symbol error rate) was measured. The recording / reproduction characteristics were measured using ODU-1 000 manufactured by Pulstech Corporation, with a wavelength of 405 nm, a numerical aperture (NA) of 0.85, and a linear velocity of 4.92 mZs. The recording / reproduction characteristics are set to 4.0 X 1 0 to 1 3 as a threshold value, and a value lower than this is set to pass. The maximum particle size of the artificial fingerprint liquid (triolein) was measured with an attached micrometer by observing the largest particle diameter within a range of 12 mm with the artificial fingerprint liquid attached, using an optical microscope. The contact angle was determined by dropping triolein (manufactured by Kanto Chemical Co.) 2. OjU I onto a BD-R disc and measuring the angle when the droplet was in an equilibrium state. CA-X type).
(本発明例 1 ) 有機材料系の記録層を有する B D一 Rの光透過層の表面 に、 レべリング剤を 3. 0%含有するハードコート剤を用いてハードコー ト層を形成した。 このときのハードコート層はトリオレインに対する接触 角が 71° であった。 この BD— Rのシンボルエラーレートは、 1. 0 X 1 0—3であった。 また、 トリオレインの最大粒子径は 5 mであった。 (Invention Example 1) A hard coat layer containing 3.0% leveling agent was formed on the surface of a light transmitting layer of BD-1R having an organic material type recording layer. At this time, the hard coat layer had a contact angle with respect to triolein of 71 °. Symbol error rate of the BD- R is 1. a 0 X 1 0- 3. The maximum particle size of triolein was 5 m.
(本発明例 2 ) 有機材料系の記録層を有する B D— Rの光透過層の表面 に、 レベリング剤を 1. 5%含有するハードコート剤を用いてハードコー ト層を形成した。 このときのハードコート層はトリオレインに対する接触 角が 62。 であった。 この BD— Rのシンポルエラ一レートは、 3. 9 X 1 0— 3であった。 また、 トリオレインの最大粒子径は 1 0 jUmであった。 (Invention Example 2) A hard coat layer containing 1.5% leveling agent was formed on the surface of a light transmitting layer of BD-R having an organic material type recording layer. At this time, the hard coat layer has a contact angle of 62 with triolein. Met. The symbolic rate of this BD—R was 3.9 × 10 3 . The maximum particle size of triolein was 10 jUm.
(本発明例 3 ) 無機系材料の記録層を有する B D一 Rの光透過層の表面 に、 レペリング剤を 1. 00/0含有するハードコート剤を用いてハードコー ト層を形成した。 このときのハードコート層はトリオレインに対する接触 角が 50° であった。 この BD— Rのシンボルエラ一レートは、 2. 0 X 1 0—3であった。 また、 トリオレインの最大粒子径は 1 5 mであった。 Invention Example 3 A hard coat layer was formed on the surface of a light transmitting layer of BD-1R having a recording layer of an inorganic material using a hard coat agent containing a 1.00 / 0 repelling agent. At this time, the hard coat layer had a contact angle with respect to triolein of 50 °. The symbol error rate of this BD-R was 2.0 X 1 0-3. The maximum particle size of triolein was 15 m.
(比較例 1 ) 有機材料系の記録層を有する BD— Rの光透過層の表面に、 レペリング剤を 1. 0%含有するハードコート剤を用いてハードコート層 を形成した。 このときのハードコート層はトリオレインに対する接触角が 51° であった。 この BD— Rのシンボルエラーレートは、 1. 0 X 1 0 一2であった。 また、 トリオレインの最大粒子径は 1 5 mであった。 Comparative Example 1 A hard coat layer was formed on the surface of a light transmitting layer of BD-R having an organic material type recording layer by using a hard coat agent containing 1.0% of a repelling agent. At this time, the hard coat layer had a contact angle with respect to triolein of 51 °. Symbol error rate of the BD- R was 1. 0 X 1 0 one 2. The maximum particle size of triolein was 15 m.
(比較例 2 ) 有機材料系の記録層を有する B D一 Rの光透過層の表面に、 レべリング剤を 0. 5%含有するハードコ一ト剤を用いてハードコート層 を形成した。 このときのハードコート層はトリオレインに対する接触角が 42° であった。 この BD— Rのシンボルエラーレートは、 5. 0 X 1 0 一2であった。 また、 トリオレインの最大粒子径は 20 mであった。 Comparative Example 2 A hard coat layer was formed on the surface of a light transmitting layer of BD-1R having an organic material type recording layer by using a hard coat agent containing 0.5% of a leveling agent. The hard coat layer at this time had a contact angle with respect to triolein of 42 °. Symbol error rate of the BD- R was 5. 0 X 1 0 one 2. The maximum particle size of triolein was 20 m .
(比較例 3 ) 無機材料系の記録層を有する B D— Rの光透過層の表面に、 レペリング剤を 0. 5%含有するハードコート剤を用いてハードコート層 を形成した。 このときのハードコート層はトリオレインに対する接触角が 42° であった。 この B D— Rのシンボルエラーレートは、 3, 0X 10 一2であった。 また、 トリオレインの最大粒子径は 2 OjUmであった。 以 上の結果を表 1にまとめた。 (Comparative Example 3) A hard coat layer containing 0.5% of a repelling agent on the surface of a light transmitting layer of BD-R having an inorganic material type recording layer Formed. The hard coat layer at this time had a contact angle with respect to triolein of 42 °. Symbol error rate of the BD- R were 3, 0X 10 one 2. The maximum particle size of triolein was 2 OjUm. The above results are summarized in Table 1.
表 1 table 1
Figure imgf000010_0001
Figure imgf000010_0001
以上の結果から、 トリオレインとの接触角が 50° 以上好ましくは 6 0° 以上のハードコート層であれば、 指紋が付いたままでも良好な記録特 性が得られる B D— Rを得ることができる。 From the above results, if the hard coat layer has a contact angle with triolein of 50 ° or more, preferably 60 ° or more, it is possible to obtain a BD-R that can obtain good recording characteristics even with a fingerprint attached. it can.
なお、 本発明の実施形態は、 BD— Rを例にとって説明したが、 CD— Rや D V D土 R等の、 その他の光情報記録媒体にも適用可能である。  Although the embodiment of the present invention has been described by taking BD-R as an example, it can also be applied to other optical information recording media such as CD-R and DV RD.

Claims

請求の範囲 The scope of the claims
1 . 記録層と、 該記録層に照射されるレーザ光が通過する光透過層と、 を 有する光情報記録媒体において、 1. An optical information recording medium comprising: a recording layer; and a light transmission layer through which a laser beam irradiated to the recording layer passes.
前記光透過層の表面にハードコート層が形成されており、 前記ハ一ドコ 一ト層は、 硬化被膜上における粒子状のトリオレインとの接触角が 5 0 ° 以上となる樹脂であることを特徴とする光情報記録媒体。  A hard coat layer is formed on the surface of the light transmission layer, and the hard coat layer is a resin whose contact angle with particulate triolein on the cured coating is 50 ° or more. A characteristic optical information recording medium.
2 . 前記ハードコート層は、 硬化被膜上におけるトリオレインとの接触角 が 6 0 ° 以上となる樹脂であることを特徴とする請求項 1に記載の光情報 記録媒体。  2. The optical information recording medium according to claim 1, wherein the hard coat layer is a resin having a contact angle with the triolein on the cured coating of 60 ° or more.
3 . 前記ハードコート層を形成する樹脂は、 シリコン系またはフッ素系の レべリング剤を含んでおリ、 前記レべリング剤の含有量が 1 . 0 %〜 3 . 0 %であることを特徴とする請求項 1に記載の光情報記録媒体。  3. The resin forming the hard coat layer contains a silicon-based or fluorine-based leveling agent, and the content of the leveling agent is 1.0% to 3.0%. 2. The optical information recording medium according to claim 1, wherein
4 . 前記ハードコート層を形成する樹脂は、 シリコン系またはフッ素系の レべリング剤を含んでおリ、 前記レべリング剤の含有量が 1 . 5 %〜 3 . 0 %であることを特徴とする請求項 2に記載の光情報記録媒体。  4. The resin forming the hard coat layer contains a silicon-based or fluorine-based leveling agent, and the content of the leveling agent is 1.5% to 3.0%. 3. The optical information recording medium according to claim 2, wherein
5 . 記録層と、 該記録層に照射されるレーザ光が通過する光透過層と、 を 有する光情報記録媒体の製造方法において、  5. In a method for manufacturing an optical information recording medium, comprising: a recording layer; and a light transmission layer through which laser light applied to the recording layer passes.
前記光情報記録媒体を用意するステップと、  Providing the optical information recording medium;
前記光情報記録媒体の前記光透過層表面に、 硬化被膜上におけるトリオ レインとの接触角が 5 0 ° 以上となる樹脂材料をスピンコート法によって 塗布するステップと、  Applying to the surface of the light transmission layer of the optical information recording medium a resin material having a contact angle with triolein on the cured coating of 50 ° or more by a spin coating method;
前記樹脂材料を硬化させてハードコート層を形成するステップと、 を有することを特徴とする光情報記録媒体の製造方法。  Curing the resin material to form a hard coat layer. A method for producing an optical information recording medium, comprising:
6 . 前記樹脂材料は、 硬化被膜上におけるトリオレインとの接触角が 6 0 ° 以上となる樹脂材料であることを特徴とする請求項 5に記載の光情報 記録媒体の製造方法。  6. The method for producing an optical information recording medium according to claim 5, wherein the resin material is a resin material having a contact angle with triolein on a cured coating of 60 ° or more.
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