Classifications

• • 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
  • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
  • G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/36—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using a polymeric layer, which may be particulate and which is deformed or structurally changed with modification of its' properties, e.g. of its' optical hydrophobic-hydrophilic, solubility or permeability properties
  • B41M5/363—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using a polymeric layer, which may be particulate and which is deformed or structurally changed with modification of its' properties, e.g. of its' optical hydrophobic-hydrophilic, solubility or permeability properties using materials comprising a polymeric matrix containing a low molecular weight organic compound such as a fatty acid, e.g. for reversible recording
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
  • B41M5/42—Intermediate, backcoat, or covering layers
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
  • G11B23/38—Visual features other than those contained in record tracks or represented by sprocket holes the visual signals being auxiliary signals
  • G11B23/40—Identifying or analogous means applied to or incorporated in the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader, photograph
• • 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
• • 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
  • G11B7/24094—Indication parts or information parts for identification
• • 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
  • G11B7/249—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 organometallic compounds

Definitions

• the present invention relates to an optical information recording medium capable of optical recording and reproduction of information, and more particularly, to optical recording / reproduction of electronic information and visual information using laser light on a label surface side.
• the present invention relates to an optical information recording medium capable of performing good recording. Background art
• optical information recording media that perform recording and reproduction using laser light are attracting attention as large-capacity recording media because they can perform high-density information recording, storage, and reproduction.
• optical information recording media include phase-change optical recording media such as CD-RW and DVD-RW, and organic dye-based optical recording media such as CD_R and DVD-R. Is mentioned.
• the contents of the electronic information recorded on such an optical information recording medium can be confirmed by optically reproducing the information.
• displaying the contents of the electronic information on the surface of the medium as visible information requires information management. Is important.
• a display method conventionally, for example, a method of printing and recording the contents of electronic information on a label surface of a medium (a surface opposite to a surface on which electronic information is recorded) using an inkjet printer or a thermal printer. For example, a method of attaching a label or the like recording the content of electronic information is adopted.
• a method of recording visible information on the label side of a medium by using a laser beam has been reported (for example, Japanese Patent Application Laid-Open Nos. 2000-17073 and 2000-1-2). It is expected as a method that can record visible information without mechanically affecting the medium. Disclosure of the invention
• Visible information is provided on the label side of the medium by the laser light reported in the above-mentioned Japanese Patent Application Laid-Open Publication No. 2000-20177309 or Japanese Patent Publication No. 2001-2836464 Publication.
• the recording method has the following problems. In other words, the method of recording visible information on the label side of the medium with laser light uses changes in reaction, melting, and precipitation due to heat. Therefore, it is necessary to pay sufficient attention to the irradiation method. Therefore, in order to reduce the thermal effect on such a medium, it is necessary to use a low output laser beam of about 10 to 20 OmW.
• the energy of the laser beam is concentrated efficiently by concentrating the low-output laser beam on the layer that records visible information (the visible information recording layer). Is effective, but to do so, it is necessary to apply a focus service.
• an object of the present invention is to record visible information on the label side using a low-power laser beam without adversely affecting electronic information recorded on a medium.
• An object of the present invention is to provide an optical information recording medium capable of recording.
• the optical information recording medium of the present invention is formed such that the reflectance with respect to the laser light irradiated from the label side is within a certain range. That is, the optical information recording medium of the present invention is provided on a substrate and directly or via another layer on the substrate, and the visible information is irradiated by a laser beam irradiated from a label surface side opposite to the substrate side. And a reflectance of 15% or more and 50% or less for a laser beam emitted from the label side.
• the optical information recording of the present invention comprises, on a substrate having a recording / reproducing guide groove and Z or pit, at least an electronic information recording layer on which digital information is recorded by a laser beam irradiated from the substrate side.
• the visible information recording layer may be characterized in that an overcoat layer is formed on the level surface side of the visible information recording layer.
• the lower limit of the thickness of the overcoat layer is preferably 10 and the upper limit thereof is preferably in the range of 100.
• the visible information recording layer is characterized in that the visible information recording layer is made of a material whose color developing property changes or a material whose transparency changes by a laser beam applied to the visible information recording layer.
• the visible information recording layer preferably has a reflective layer formed on at least one side of the visible information recording layer. In this case, the visible information recording layer and the reflection layer may be in contact with each other, or an arbitrary layer that transmits laser light may be provided between the visible information recording layer and the reflection layer.
• the scientific information recording medium of the present invention is provided with a substrate and directly or via another layer on the substrate.
• An optical information recording medium comprising: a protective layer formed on a side opposite to the substrate side of the optical information recording medium, wherein the protective layer is formed on a side opposite to the substrate side of the protective layer, and is on a side opposite to the substrate side.
• visible information is information that is visually read, such as characters, symbols, images such as illustrations and photographs, and geometric patterns.
• Electrical information is recorded as digital signals. This means information that is read by any playback device, such as information that is being read. The invention's effect
• an optical information recording medium capable of recording visible information on a label surface by irradiating a laser with a low output of about 10 to 20 OmW.
• FIG. 1 is a diagram for explaining the structure of an optical information recording medium according to a first embodiment of the present invention.
• FIG. 2 is a diagram for explaining the structure of an optical information recording medium according to a second embodiment of the present invention.
• FIG. 3 is a diagram for explaining a recording device that records visible information on an optical information recording medium having a visible information recording layer. Explanation of reference numerals
• FIG. 1 is a diagram for explaining the structure of an optical information recording medium according to a first embodiment of the present invention.
• the optical information recording medium 100 shown here is composed of a substrate 101, an electronic information recording layer 102 on this substrate 101, and a laser beam 107 of the electronic information recording layer 102.
• Reflective layer 103 provided on the side opposite to the side where light is incident, protective layer 104, visible information recording layer 105, and overcoat layer 10 forming the outermost layer 6 and are sequentially laminated.
• an electronic information recording layer 102 provided on an optical information recording medium 100 is provided by an objective lens (not shown) of a laser device for recording and reproducing electronic information from a substrate 101
• the recording and reproduction of electronic information is performed by the laser beam 107 incident through the.
• the optical information recording medium 100 is turned upside down and set in a laser device for recording and reproducing electronic information, for example, the visible information recording layer 105 becomes overcoated layer 106 from the label side. Visible information is recorded by the laser beam 108 radiated through the laser beam.
• a part of the laser beam 108 is supplied to a reflective layer 1010 provided below the visible information recording layer 105 (substrate 101 side).
• the reflected light 109 is used for forcing for condensing the laser light 108.
• the substrate 101 is basically formed of a material transparent to the wavelength of the recording light and the reproduction light for the electronic information recording layer 102.
• a material for forming the substrate 101 include polymers such as polycarbonate resin, acrylic resin, methacrylic resin, polystyrene resin, vinyl chloride resin, epoxy resin, polyester resin, and amorphous polyolefin resin.
• polymers such as polycarbonate resin, acrylic resin, methacrylic resin, polystyrene resin, vinyl chloride resin, epoxy resin, polyester resin, and amorphous polyolefin resin.
• inorganic materials such as glass are used.
• poly-polycarbonate resins are preferred because they are excellent in terms of high light transmission, low optical anisotropy, and high mechanical strength.
• amorphous polyolefin is preferable in terms of chemical resistance, moisture absorption resistance, optical characteristics, and the like.
• the substrate 101 is provided with, for example, a recording / reproducing guide groove and a Z or pit on a surface in contact with the electronic information recording layer 102, and is molded by a molding method such as injection molding.
• a molding method such as injection molding.
• Such guide grooves and / or pits are preferably provided at the time of molding the substrate 101.
• the guide grooves and / or pits may be provided on the substrate 101 using an ultraviolet (UV) curable resin.
• UV ultraviolet
• the lower limit of the thickness of the substrate 101 is usually 1.1 mm, preferably 1.15 mm, and the upper limit of the thickness is usually 1.3 mm, preferably 1.25 mm.
• the electronic information recording layer 102 is formed of a material capable of recording electronic information (information read by a reproducing device, such as information recorded as digital signals, etc.) by irradiation of a laser beam 107, and is usually formed. It is formed as a recording layer made of an organic substance or a recording layer made of an inorganic substance. Note that the electronic information recording layer 102 may be formed directly on the substrate 101, and if necessary, may be disposed between the substrate 101 and the electronic information recording layer 102. Alternatively, it may be formed via a layer.
• organic dye When the electronic information recording layer 102 is a recording layer made of an organic substance, an organic dye is mainly used.
• organic dyes include, for example, macrocyclic azanulene-based dyes (phthalocyanine). Phanine dye, naphthocyanine dye, porphyrin dye, etc.), polymethine dye (cyanine dye, merocyanine dye, squarylium dye, etc.), anthraquinone dye, azurenium dye, azo dye, metal-containing azo dye And metal-containing indoor diphosphorus dyes.
• metal-containing azo dyes, cyanine dyes and phthalocyanine dyes are preferred.
• metal-containing azo dyes are preferable because of their excellent durability and light fastness.
• Examples of the method for forming the electronic information recording layer 102 made of an organic substance include dry film forming methods such as a vacuum evaporation method and a sputtering method, and wet film forming methods generally used such as a casting method, a spin coating method, and an immersion method. Is mentioned. Of these, the wet film forming method is preferred in terms of mass productivity and cost, and the spin coating method is particularly preferred.
• the electronic information recording layer 102 is formed as a recording layer made of an inorganic substance, for example, a rare earth transition metal alloy such as Tb'Te'Co or Dy'Fe'Co, which is recorded by a magneto-optical effect, is used. You. Also, chalcogen-based alloys such as Ge'Te and Ge'Sb'Te which change phase may be used. These layers may be a single layer or may be composed of two or more layers.
• Examples of a method for forming the electronic information recording layer 102 made of an inorganic substance include a vapor deposition method, an ion plating method, and a sputtering method. Among them, the sputtering method is particularly preferable from the viewpoint of mass productivity and cost.
• the thickness of the electronic information recording layer 102 varies depending on the type of the recording layer, but the lower limit is usually 5 nm, preferably 10 nm, and the upper limit is usually 500 nm, preferably 300 nm.
• the electronic information recording layer 102 of the optical information recording medium 100 of the present invention may be a phase-change recording layer capable of recording and erasing.
• the reflection layer 103 is provided in contact with the electronic information recording layer 102 on the side opposite to the substrate 101, and generally has a function of reflecting a laser beam 107 emitted from the substrate 101 side to the substrate 101 side.
• the reflective layer 103 has a guide groove and Z or pit for recording / reproducing on the substrate 101. If provided, a corresponding uneven shape is produced.
• a material for forming the reflective layer 103 a material having a sufficiently high reflectance at the wavelength of the reproduction light can be used.
• metals such as Au, Al, Ag, Cu, Ti, Cr, Ni, Pt, Ta, and Pd can be used alone or as an alloy.
• Au, Al, and Ag have high reflectivity and are suitable as a material for the reflective layer. Further, those containing Ag as a main component are particularly preferable from the viewpoint of low cost and high reflectivity.
• Examples of a method for forming the reflective layer 103 include a vapor deposition method, an ion plating method, and a sputtering method. Of these, the sputtering method is particularly preferred in terms of mass productivity and cost.
• the lower limit of the thickness of the reflective layer 103 is usually 30 nm, preferably 50 nm, and the upper limit is usually 150 nm, preferably 120 nm.
• the protective layer 104 is usually formed of a laser light transmitting material, for example, an ultraviolet (UV) curable resin.
• an ultraviolet (UV) curable resin include, for example, acrylate resins such as urethane acrylate, epoxy acrylate, and polyester acrylate. Most of these materials are laser light transmissive substances, and thus can be suitably used.
• One of these ultraviolet (UV) curable resins may be used alone, or two or more thereof may be used in combination.
• the protective layer 104 may be a single-layer film or a multilayer film of two or more layers.
• an ultraviolet (UV) curable resin is used as it is or after dissolving in an appropriate solvent to prepare a coating solution. It can be formed by applying a coating liquid on the reflective layer 103 and irradiating it with ultraviolet (UV) light to cure it.
• a spin coating method, a casting method, or the like can be adopted as the coating method.
• the protective layer 104 may be formed by any of the above-mentioned various coating methods, various wet film forming methods such as screen printing, and various dry film forming methods such as a vacuum evaporation method, a sputtering method, and an ion plating method.
• the lower limit of the thickness of the protective layer 104 is usually l; m, preferably 3 m, and the upper limit is usually 15 m, preferably 10 jam.
• the recording material constituting the layer When the visible information recording layer 105 is irradiated with a single laser beam, the recording material constituting the layer usually changes color, and as a result, the visible information (characters, symbols, images such as illustrations and photographs, geometric Information that can be read visually, such as geometric patterns.
• the recording material that constitutes the visible information recording layer 105 is not particularly limited, but substances that change the absorption of visible light are roughly classified into the following (a) a type in which the coloring property changes, and (b) ) Transparency changes.
• Examples of the recording material of the type in which the chromogenicity changes include, for example, chromogenic organic dyes generally used for optical recording of electronic information.
• organic dyes include macrocyclic azananulene dyes (phthalocyanine dyes, naphthalocyanine dyes, porphyrin dyes, etc.), polymethine dyes (cyanine dyes, merocyanine dyes, squarylium dyes, etc.), anthraquinone dyes, azurenium dyes, azozones Dyes, metal-containing azo dyes, metal-containing indoaniline dyes, and the like.
• leuco dyes having a lactone ring portion in the molecular structure can be mentioned.
• Leuco dyes are preferable because the contrast at the time of color development is high and the amount of heat required for color development can be suppressed low.
• leuco dyes include 3-getylamino-7-chloroanilinofluoran, 3-getylamino-6-methyl-7-anilinofluoran, 3-dibutylamino 6-methyl-7-anilinofluoran, and 3-getylamino.
• 6-Methyl-7-2,4-xyridinofluoran 3-Jethylamino-6-methyl-7- (m-toluidino) monofluorane, 3-Jethylamino-17,8-Venzofluoran, 3-Ge Fluoran compounds such as thilamino-6-methyl-7-xidinofluoran; crystal violet lactone, 3- (4-ethylethyl-2-ethoxyphenyl) 1-3-1- (1-ethyl-2-methylindole-3-) 1) 4-azaphthalide, 3- (4-ethylpyraminophenyl) 1-3- (1-ethyl-12-methylindole-3-yl) phthalide, 3,3-bis (11-n-butyl-2-) Methylindole-3-yl) phthalide and other fluoride compounds.
• a fluoride compound is preferred.
• An electron-accepting compound or a dye that absorbs recording laser light and generates heat is used in combination with these leuco dyes as necessary.
• the electron-accepting compound include an organic phosphoric acid compound having an aliphatic group having 6 or more carbon atoms, an aliphatic carboxylic acid compound, and a phenol compound.
• it is a phenol compound.
• the electron accepting compound include dodecylphosphonic acid, tetradecylphosphonic acid, hexadecylphosphonic acid, octadecylphosphonic acid, and eicosylphosphonic acid.
• Examples of the aliphatic carboxylic acid compounds include: -hydroxydecanoic acid, ⁇ -hydroxytetradecanoic acid, ⁇ -hydroxyhexadecanoic acid, ⁇ -hydroxyoctadecanoic acid, ⁇ Examples thereof include monohydroxydocosanoic acid, ⁇ -hydroxytetracosanoic acid, ⁇ -hydroxyhexacosanoic acid, and ⁇ -hydroxyoctacosanoic acid.
• phenol compound examples include a gallic acid compound, a benzoic acid compound, a bisphenol compound, and the like.
• these compounds include methyl gallate, methyl gallate, propyl gallate, butyl gallate, lauryl gallate and the like.
• the benzoic oxide compound include methyl ⁇ -hydroxybenzoate, ethyl ⁇ -hydroxybenzoate, and 2,4-didroxybenzoic acid.
• Bisphenol compounds include bisphenol Enol 3, bisphenol A and the like. In addition, 4'-hydroxy-4 year-old kutadecyl penzanilide, N-year-old kutadecyl-4-hydroxybenzamide, N- (4-hydroxyphenyl) -one N'-year-old kutadecyl urea, 4-hydroxyphenol Nylhydrazide and the like.
• These electron accepting compounds may be used alone or in combination of two or more.
• laser light-absorbing dye examples include the various dyes described above as organic dyes used for optical recording of electronic information, and infrared-absorbing dyes such as bisanthone-based dyes and indoaniline-based dyes.
• a recording material of a type in which transparency changes for example, an organic low-molecular compound that is dispersed in a resin base material at about 0.1 to 2 / m and melts or crystallizes by heat treatment is listed. I can do it.
• the compound for example, a known organic low-molecular compound such as a higher fatty acid having 12 or more carbon atoms can be used.
• the organic low molecular weight compound may be a compound composed of a fatty acid, an aliphatic dibasic acid, a ketone, an ether, an alcohol, a fatty acid ester, or a derivative thereof, and one or more of them may be used in combination. You can also.
• alkyl esters of fatty acid flax having 12 or more carbon atoms have a low melting point (mp) and are preferred because they are melted and crystallized by heat treatment at relatively low temperature.
• a high melting point (mp) aliphatic dibasic acid having 10 or more carbon atoms is used in combination, and the mixing ratio of the fatty acid alkyl ester and the aliphatic dibasic acid is adjusted. By adjusting the temperature, it is possible to adjust the temperature range for the transparency, and to change the degree of transparency and opacity at a predetermined temperature.
• fatty acid alkyl esters having 12 or more carbon atoms examples include methyl stearate, ethyl stearate, butyl stearate, octyl stearate, stearyl stearate, behenyl stearate, methyl behenate, and behate.
• Examples of the aliphatic dibasic acid having 10 or more carbon atoms include sepasic acid, dodecandioic acid, tetradecandioic acid, eicosantioic acid, and the like.
• the ratio of the former to the latter is preferably about 1: 1 to 10: 1, and 2: 1 to 10: 1. 6: 1 is more preferred.
• the aliphatic dibasic acid on the high melting point side is thought to play a role in controlling the crystallization behavior as a seed crystal of the fatty acid alkyl ester on the low melting point side.Therefore, if the amount is too small, the effect may be lost. Yes, on the other hand, if the amount is too large, the contrast may be reduced.
• the visible information recording layer 105 As a method for forming the visible information recording layer 105, a known wet film formation method as described in the section of the method for forming the electronic information recording layer 102 can be used. Of these, spin coating or screen printing is preferred, and spin coating is more preferred.
• the lower limit of the thickness of the visible information recording layer 105 is usually 0.1 im, preferably 0.5 ⁇ m, and the upper limit of the thickness is usually 5 ⁇ m, preferably 3 / im. is there.
• the overcoat layer 106 protects the visible information recording layer 105 from physical damage and the like.
• the visible information recording layer 105 In addition, in order to efficiently narrow the laser beam 108 to the visible information recording layer 105, the visible information recording layer It is provided on the label side of the recording layer 105 and forms the outermost layer.
• the laser beam 108 can be narrowed down efficiently, so that the visible information can be recorded on the visible information recording layer 105 even when the power of the laser beam 108 is reduced. can do. This can further reduce the thermal effect on electronic information.
• the material forming the overcoat layer 106 is not particularly limited as long as it is a material that protects the visible information recording layer 105 from external force and the like and is transparent to laser light.
• Examples of the material constituting the overcoat layer 106 include, as the organic substance, a thermoplastic resin, a thermosetting resin, an electron beam curable resin, an ultraviolet (UV) curable resin, and the like.
• the overcoat layer 106 can be formed by dissolving a thermoplastic resin, a thermosetting resin, or the like in an appropriate solvent, applying a coating solution, and drying. Ultraviolet (UV) curable resin is used as it is or after dissolving in a suitable solvent to prepare a coating solution, then applying this coating solution and irradiating it with ultraviolet (UV) light to overcoat. Layer 106 can be formed.
• UV curable resin for example, acrylate resins such as urethane acrylate, epoxy acrylate, and polyester acrylate can be used.
• the overcoat layer 106 may be a single-layer film or a multilayer film having two or more layers as long as it is transparent to the laser beam 108.
• the overcoat layer 106 is preferably formed by a wet film-forming method using the above-mentioned various organic substances.
• a spin coating method, a casting method, a screen printing method, or the like can be employed as in the case of the protective layer 104 described above.
• the spin coating method is particularly preferred because of its high surface smoothness.
• a transparent substrate made of a laser light transmitting material is to be bonded in advance, it is necessary to perform accurate alignment of the substrate.
• Various innovations in the manufacturing process are required, such as reducing the pressure in the bonding process to prevent air bubbles from entering the layer. Therefore, from the viewpoint of productivity, it is advantageous to provide the overcoat layer 106 by a wet film forming method such as spin coating or screen printing.
• the lower limit of the thickness of the overcoat layer 106 is 10 m, preferably 20 im, The limit is 100 °, preferably 80 m.
• the thickness of the overcoat layer 106 is excessively small, the visible information recording layer 105 may not be able to maintain a sufficient protective function. In addition, the focus of the recording laser beam becomes unstable, and stable recording cannot be performed.
• the thickness of the overcoat layer 106 is less than 10 m, if the thickness variation of the overcoat layer 106 in the circumferential direction is equal to or more than the wavelength of the laser beam (up to 900 nm), the laser Light interference may occur, and the amount of reflected light for focusing may fluctuate, making it impossible to perform stable focusing. If the thickness is 10 im or more, even if the thickness fluctuates, interference does not easily occur, so that focusing can be stably performed.
• the refractive index of the overcoat layer 106 is preferably at least 0.4, more preferably at least 0.5. Further, it is preferably 2.6 or less, more preferably 1.9 or less. If the refractive index of the overcoat layer 106 is excessively large, the amount of reflection of the laser beam 108 on the surface of the overcoat layer 106 increases, and the visible information recording layer 105 is efficiently visible. It may be difficult to record information.
• the thickness of the layer to be formed is controlled.
• the upper limit of the thickness of a layer such as a protective layer formed on an optical disc is about 3 to 7, so when forming a layer by the spin coating method, the viscosity of the coating liquid for forming the layer is 100 CPS.
• a layer is formed by controlling the number of rotations to 700 to 100 rpm and the rotation time to 1 to 3 seconds.
• the overcoat layer is formed by a spin coating method. The overcoat layer is formed by increasing the viscosity of the liquid as much as possible, making the rotation speed as slow as possible, and making the rotation time as long as possible.
• the viscosity is usually 200 CPS or more, preferably 300 CPS or more, usually 10,000 CPS or less, preferably 6000 CPS or less
• the rotation speed is usually 1000 rpm or more, preferably 2000 rpm or more, and usually 600 rpm. pm or less, preferably 5000 rpm or less
• the rotation time is usually 4 seconds or more and 10 seconds or less.
• the optical information recording medium 100 of the present invention is formed so that the reflectance with respect to the light irradiated from the label side is in the range of 15% or more, preferably 20% or more, 50% or less, preferably 40% or less. I have.
• the reflectivity is obtained by irradiating a light having a wavelength corresponding to the wavelength ( ⁇ ) of the laser beam applied to the visible information recording layer 105 on the level surface side of the optical information recording medium 100 before recording the visible information.
• the spectral reflectance on the label side at that time is calculated using the integrating sphere (1
• the laser beam used in the present invention is a semiconductor laser beam, and if it is a semiconductor laser beam, the wavelength ( ⁇ ) is 300 to 8
• the reflectance with respect to the laser beam irradiated from the level surface side is in the range of 15% or more, preferably 20% or more, 50% or less, and preferably 40% or less. It is formed so that it becomes. This maintains a balance between the ratio of the laser beam 108 irradiated from the label side to the visible information recording layer 105 and the ratio of the reflected light 109 reflected to the label side. As a result, the amount of light incident on the visible information recording layer 105 is secured, and the reflected light 109 reflecting the laser light 108 irradiated from the label side is stabilized, and focusing is performed by the stable reflected light 109. Is performed. This makes it possible to record clear visible information on the visible information recording layer 105 using a low-output laser beam.
• the method of forming the optical information recording medium 100 of the present invention so that the reflectance with respect to the laser light irradiated from the label side is in the range of 15% or more and 50% or less.
• the layer 105 is composed of a chromogenic organic dye
• the reflectance of the visible information recording layer 105 with respect to the laser light 108 is controlled by adjusting the mixing ratio of the laser light absorbing dye used in combination with the chromogenic organic dye, and the reflectance is adjusted.
• the content is controlled by adjusting the mixing ratio of the laser light absorbing dye used in combination with the chromogenic organic dye, and the reflectance is adjusted.
• the absorption rate is measured as an absorbance.
• the composition of the recording material (coating solution) used to form the visible information recording layer 105 contains the laser light absorbing dye in a solid content concentration of 1% by weight or more, preferably 3% by weight or more. , 15% by weight or less, preferably 7% by weight or less.
• the laser light absorbing dye is contained in an amount of about 20%.
• the laser The reflectance is adjusted with the light absorbing dye in the above range.
• the reflectance can be reduced by increasing the thickness of the visible information recording layer 105, and the reflectance can be increased by decreasing the thickness of the visible information recording layer 105.
• the lower limit of the thickness of the visible information recording layer 105 whose reflectance is 15% or more and 50% or less is usually 0.1 or more, preferably 0.5; um or more, and the upper limit of the thickness is It is usually 5 m or less, preferably 3 m or less.
• the thickness of the visible information recording layer is set to about 10 m in order to sufficiently change the recording portion of the visible information recording layer and clearly record the visible information.
• the reflectance is adjusted so that the thickness of the visible information recording layer 105 is in the above range so that the thickness is in the range from 50% to 50%.
• the content of the laser light-absorbing dye in the visible information recording layer 105 should be 1% by weight or more in terms of solid content in order to stably set the reflectance to 15% or more and 50% or less. It is very effective to set the thickness of the visible information recording layer 105 to 0.1 l / m or more.
• the reflection layer 103 serves as a reflection layer for the laser beam 107 irradiated from the substrate 101 side for recording electronic information, Since it serves as a reflective layer for the laser beam 108 irradiated from the label side to record visible information, it is preferable to simplify the layer configuration and reduce manufacturing costs.
• the lower side of the visible information recording layer 105 (for recording) is used to obtain reflected light 109 for stable focusing. It is preferable that a second reflective layer is provided on the side opposite to the laser light incident surface). Further, an overcoat layer made of a laser light transmitting material may be formed between the second reflective layer and the visible information recording layer 105.
• FIG. 2 is a diagram for explaining the structure of the second embodiment of the information recording medium of the present invention.
• the optical information recording medium 200 shown here is composed of a substrate 201, an electronic information recording layer 202 on this substrate 201, and a laser beam 200 of the electronic information recording layer 202.
• a first reflective layer 203 provided in contact with the side on which light is incident and a protective layer 204, a visible information recording layer 205, and a translucent second reflective layer 2 13;
• an overcoat layer 206 forming the outermost layer are sequentially laminated.
• the electronic information recording layer 202 provided on the optical information recording medium 200 is formed by an objective lens (not shown) of a laser device for recording / reproducing electronic information from a substrate 201.
• the recording and reproduction of electronic information is performed by the laser beam 207 incident through the.
• the visible information recording layer 205 is, for example, turned over the optical information recording medium 200 to record electronic information.
• visible information is recorded by a laser beam 208 irradiated from the label side via the overcoat layer 206.
• a part of the laser light 208 is reflected by the semi-transparent second reflective layer 211 provided in contact with the visible information recording layer 205, and the reflected light 209 is reflected by the laser light. Used for forcing to focus 208. '
• a translucent second reflective layer 21 is provided above the visible information recording layer 205 (on the label side).
• the translucent second reflective layer 21 3 is formed using the same material as the first reflective layer 203 so that the reflectance is about 10% or more and about 50% or less.
• the translucent second reflective layer 2 13 reflects a part of the laser light 208 irradiated from the label side and transmits a part of the laser light 208 to reach the visible information recording layer 205.
• the method of controlling the reflectance of the translucent second reflective layer 2 13 is not particularly limited, and for example, a method of controlling by changing the thickness of the layer may be mentioned.
• Examples of the material for forming the translucent second reflective layer 21 include Au, Al, Ag, Cu, Ti, Cr, Ni, Pt, Ta, Pd, and the like. It is possible to use these metals alone or as alloys. Among these, Au, Al, and Ag are preferable because it is easy to control the reflectance by changing the thickness of the layer.
• Examples of a method for forming the translucent second reflective layer 21 include an evaporation method, an ion plating method, and a sputtering method. Among them, the sputtering method is particularly preferable from the viewpoint of mass productivity and cost.
• the lower limit of the thickness of the translucent second reflective layer 21 is usually 3 nm, preferably 5 nm, and the upper limit is usually 70 nm, preferably 50 nm.
• the upper side of the visible information recording layer 205 (label By providing the translucent second reflective layer 2 13 on the surface side), the laser light 208 irradiated from the label side is reflected by the translucent second reflective layer 2 13 and this reflected light 2 09
• the laser light 208 irradiated from the label side is reflected by the translucent second reflective layer 2 13 and this reflected light 2 09
• clear visible information can be recorded on the visible information recording layer 205 using a low-output laser beam.
• the optical information recording mediums 100 and 200 of the present invention may have any layers other than those described above.
• a recording layer made of an inorganic material is used as the electronic information recording layer 102
• a dielectric layer sandwiching the electronic information recording layer 102 is provided.
• An arbitrary layer may be provided between the optical information recording media 100 and 200 or in contact with the outermost layer.
• the optical recording medium may have a plurality of electronic recording layers.
• a substrate having a guide groove and / or pit having a thickness of about 0.6 mm (first substrate) and a so-called dummy substrate (second substrate) having no guide groove and no Z or pit are used.
• the first substrate has a laminated structure of electronic information recording layer / reflective layer / adhesive layer Z second substrate / visible information recording layer / overcoat layer, or the first substrate.
• the present invention can be applied to a laminated structure composed of the substrate Z, the electronic information recording layer Z, the reflective layer Z, the adhesive layer Z, and the visible information recording layer.
• the overcoat layer and the second substrate side are the label side, respectively, and other layers may be provided as needed between each layer and the outermost layer.
• the present invention is not limited to the substrate-incident optical disk, but may be a so-called film-incident optical recording medium that records and reproduces information by irradiating a laser beam from the protective layer side (that is, the film surface side).
• the present invention can be applied to a laminated structure including an overcoat layer, a visible information recording layer, a substrate, a Z reflection layer, an electronic information recording layer, and a protective layer.
• the overcoat layer side is the label side
• the substrate is provided with a guide groove and / or on the side where the information recording layer is provided. Has a pit.
• other layers may be provided as needed between each layer or as the outermost layer.
• optical information recording medium of the present invention will be described more specifically with reference to examples. Note that the present invention is not limited to these examples.
• FIG. 3 is a diagram for explaining a recording device that records visible information on an optical information recording medium having a visible information recording layer.
• the recording device 300 shown in FIG. 3 is a device capable of recording visible information on an optical information recording medium 11 having a visible information recording layer by a normal optical disk drive.
• 1 Spindle 1 2 on which spindle 1 is mounted, Spindle motor 13 rotating spindle 1 2, Stepping motor 14 for feed feed, Screw shaft 15 rotated by stepping motor 14, optional And a pickup 16 that can be moved to the position.
• this recording apparatus 300 mounts an optical information recording medium 11 on a spindle 12 and rotates it by a spindle motor 13, and at the same time, feeds a step pin damper 14 for feed and a screw shaft. Rotate 1 5 to move pickup 16 to the desired position.
• the spindle motor 13 is supported by the FG pulse signal, and the optical information recording medium 11 is adjusted to a desired rotation speed.
• the optical information recording medium 11 is focused on the surface of the optical information recording medium 11 by the focus servo, and the laser beam 17 is condensed to write visible information on the optical information recording medium 11.
• the laser power is controlled by the front monitor so that it can be written with an appropriate power.
• the write signal a pulse having a duty of about 50% is applied to the optical information recording medium 11 at an output of 40 to 5 OmW.
• the spindle rotation speed is 160 to 250 rpm.
• a 1.2-mm-thick polycarbonate resin substrate having a group of 0.45 mm in width and 155 nm in depth was formed.
• a fluoroalcohol solution of a metal-containing azo dye was applied by spin coating, and dried at 90 ° C. for 15 minutes to form an electronic information recording layer having a thickness of 7 Onm.
• Ag was sputtered to form a 70 nm-thick reflective layer.
• UV curable resin (“D-374j” manufactured by Dainippon Ink Co., Ltd.) mainly composed of an acrylate monomer on the reflective layer by spin coating, the ultraviolet (UV) light is irradiated.
• a protective layer with a thickness of 7 / xm to produce a CD-R.
• Toluene 0.05 parts by weight of a bisanthrone-based infrared-absorbing dye, and 4 parts by weight of a binder resin (10% by weight in toluene) shown in Table 1 were added with toluene.
• An organic pigment composition was prepared, applied to the protective layer by spin coating, and dried at 50 for 30 minutes to form a visible information recording layer.
• UV curable resin mainly composed of acrylate monomer
• This ink company “SD-301”, viscosity 500 CPS) is applied by spin coating at a rotation speed of 250 rpm and a rotation time of 6 seconds, and is cured by irradiation with ultraviolet (UV) light.
• a 20 m long bar coat layer (refractive index: 1.5) was formed, and nine types of optical information recording media with different reflectivities shown in Table 1 were produced.
• the nine types of optical information recording media manufactured in this manner were set in the recording device 300 shown in FIG. 3, and a low-power laser beam having a wavelength ( ⁇ ) of 780 nm and an output of 50 mw was applied to the optical device. Irradiation was performed from the label side of the information recording medium, and visible information was recorded on the visible information recording layer. Table 1 shows the results. Table 1

Landscapes

• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Optical Record Carriers And Manufacture Thereof (AREA)
• Optical Recording Or Reproduction (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

Family

ID=32708850

Family Applications (1)

Country Status (7)

Cited By (4)

Families Citing this family (6)

Citations (3)

Family Cites Families (8)

• 2003
  • 2003-12-26 CN CNB2003801085596A patent/CN100483523C/zh not_active Expired - Fee Related
  • 2003-12-26 AU AU2003292693A patent/AU2003292693A1/en not_active Abandoned
  • 2003-12-26 DE DE60328415T patent/DE60328415D1/de not_active Expired - Lifetime
  • 2003-12-26 EP EP03768334A patent/EP1583089B1/en not_active Expired - Lifetime
  • 2003-12-26 WO PCT/JP2003/016975 patent/WO2004064053A1/ja not_active Ceased
• 2004
  • 2004-01-07 TW TW093100352A patent/TW200423112A/zh not_active IP Right Cessation
• 2005
  • 2005-07-08 US US11/176,342 patent/US7551541B2/en not_active Expired - Fee Related

Patent Citations (3)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events