WO2011024297A1 - Procédé pour la production d'un support d'enregistrement d'hologramme - Google Patents

Procédé pour la production d'un support d'enregistrement d'hologramme Download PDF

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Publication number
WO2011024297A1
WO2011024297A1 PCT/JP2009/065106 JP2009065106W WO2011024297A1 WO 2011024297 A1 WO2011024297 A1 WO 2011024297A1 JP 2009065106 W JP2009065106 W JP 2009065106W WO 2011024297 A1 WO2011024297 A1 WO 2011024297A1
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Prior art keywords
recording medium
layer
hologram recording
substrate
glass transition
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PCT/JP2009/065106
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English (en)
Japanese (ja)
Inventor
勝哉 寺井
一紀 松本
留美子 早瀬
善洋 川門前
典克 笹尾
将宏 金丸
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株式会社 東芝
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Priority to PCT/JP2009/065106 priority Critical patent/WO2011024297A1/fr
Publication of WO2011024297A1 publication Critical patent/WO2011024297A1/fr

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0252—Laminate comprising a hologram layer
    • 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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2250/00—Laminate comprising a hologram layer
    • G03H2250/37—Enclosing the photosensitive material
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24035—Recording layers
    • G11B7/24044—Recording layers for storing optical interference patterns, e.g. holograms; for storing data in three dimensions, e.g. volume storage

Definitions

  • the present invention relates to a method for manufacturing a hologram recording medium.
  • Hologram recording media that record information in holograms are attracting attention as next-generation optical information recording media because they can record large volumes.
  • the hologram recording medium is generally composed of information light that carries information by spatially modulating laser light by a spatial light modulator such as a liquid crystal element or a digital micromirror device, and information light having the same wavelength as the information light.
  • Information is recorded by recording interference fringes formed by irradiating the same place with reference light generated from the same light source in a recording medium. Since the interference fringes have a three-dimensional spread, the recording layer for recording the interference fringes is not only the surface direction but also three-dimensional volume recording including the thickness direction.
  • the thickness of the recording layer greatly affects the recording density of the hologram recording medium.
  • the peak width that meets the Bragg condition of interference fringes decreases as the thickness of the hologram recording medium increases. Therefore, the so-called multiple recording performance of recording a plurality of interference fringes in the same place is improved. This means that the recording density of the hologram recording medium is increased.
  • a material of the recording layer that has attracted particular attention is a material called a photopolymer mixed with a matrix material, a radical polymerizable monomer, a photo radical polymerization initiator, etc., and a liquid or gel photo polymer is cured by a chemical reaction.
  • a technique for producing a recording layer During this curing, it is known that a phenomenon called “curing shrinkage” occurs in which the recording layer shrinks at a constant rate. As the thickness of the recording layer increases, the volume that shrinks increases, so when producing a recording layer while maintaining a constant thickness with a spacer, etc., the recording layer will be distorted unless measures are taken against this curing shrinkage. There is a risk that normal recording and reproduction of information cannot be performed.
  • a method for producing a hologram recording medium using a photopolymer for example, two substrates are arranged so as to face each other, a liquid raw material to be a recording layer is injected therebetween, and then a liquid raw material is formed by a chemical reaction.
  • a manufacturing method for obtaining a recording layer by curing is disclosed (for example, see Patent Document 1).
  • a method for producing a hologram recording medium a method is disclosed in which a recording layer is formed by liquid injection molding, and then the recording layer and a substrate are bonded together with an adhesive or the like and laminated (for example, Patent Document 2).
  • a release agent is used in order to improve the peeling between the recording layer and the mold during liquid injection molding.
  • this release agent is mixed in the recording layer, and this release agent is used. May cause light scattering. Light scattering significantly degrades the SNR (Signal-Noise Rate) representing the quality of recording and reproduction, and may also cause a reduction in recording capacity, so it needs to be reduced.
  • an object of the present invention is to provide a method for producing a hologram recording medium having excellent optical characteristics by reducing distortion and light scattering.
  • thermosoftening layer formed on the base material and having a midpoint glass transition temperature lower than that of the base material
  • a hologram recording medium According to the method for manufacturing a hologram recording medium according to one aspect of the present invention, distortion and light scattering can be reduced, so that a hologram recording medium having excellent optical characteristics can be provided.
  • FIG. 1 is a schematic longitudinal sectional view of a hologram recording medium according to the present embodiment
  • FIGS. 2A to 4B are schematic views showing manufacturing steps of the hologram medium according to the present embodiment
  • FIG. 5 is a diagram showing how to obtain the intermediate-point glass transition temperature (T mg ), the extrapolation glass transition start temperature (T ig ), and the extrapolation glass transition end temperature (T eg ).
  • a holographic recording medium 10 shown in FIG. 1 is a transmissive type, and includes a first substrate 11, a second substrate 12, and a recording layer 13.
  • the first substrate 11 and the like are arranged in the order of the first substrate 11, the recording layer 13, and the second substrate 12. That is, the recording layer 13 is sandwiched between the first substrate 11 and the second substrate 12.
  • the first substrate 11 includes a transparent base material 14 and a heat softening layer 15, and the second substrate 12 includes a transparent base material 16 and a heat softening layer 17.
  • the recording layer 13 is in contact with the heat softening layers 15 and 17.
  • the base materials 14 and 16 are part of members constituting the hologram recording medium 10 and play a role of physically and chemically protecting the recording layer 13 from the outside.
  • the thermal softening layers 15 and 17 are for relaxing the stress caused by the curing shrinkage of the recording layer 13.
  • the recording layer 13 is for recording information and has photosensitivity.
  • the light transmittance of the recording layer 13 and the thermal softening layers 15 and 17 is preferably 10% or more with respect to the recording light having a wavelength of 390 nm to 650 nm, more preferably 390 nm to 420 nm. If this light transmittance is 10% or more, necessary sensitivity and diffraction efficiency can be obtained.
  • Such a hologram recording medium 10 can be manufactured by the following method. First, the first substrate 11 and the second substrate 12 are prepared. Specifically, as shown in FIG. 2A, the thermal softening layer 15 is formed on the base material 14 to form the first substrate 11. Similarly, as shown in FIG. 2B, the heat softening layer 17 is formed on the base material 16 to form the second substrate 12.
  • plastics such as glass and polycarbonate can be used, and in some cases, a layer having an action such as an oxygen permeation preventing layer may be provided to have a multilayer structure.
  • Heat-softening layer 15, than the base material 14 and the intermediate glass transition temperature (T mg) is composed of a material having low thermal softening layer 17, the intermediate glass transition temperature (T mg) than base 16 Consists of low materials. This is based on the following reason. Since the deformation of the base materials 14 and 16 by heating leads to a significant change in the thickness of the hologram recording medium 10, the heating temperature for heating the thermosoftening layers 15 and 17 is at least the midpoint glass of the base materials 14 and 16. It must be lower than the transition temperature. For this reason, the heat softening layer 15 needs to be a material that softens at a temperature lower than the midpoint glass transition temperature of the base material 14. Since the same can be said for the heat softening layer 17, the heat softening layer 17 needs to be a material that softens at a temperature lower than the midpoint glass transition temperature of the substrate 16.
  • the JIS standard JISK7121 (method for measuring the transition temperature of plastics) uses “the midpoint glass transition temperature (T mg ) as the glass transition temperature. ) ”,“ Extrapolated glass transition start temperature (T ig ) ”, and“ extrapolated glass transition end temperature (T eg ) ”.
  • “midpoint glass transition temperature (T mg )” is a curve drawn by differential thermal analysis (DTA) or differential scanning calorimetry (DSC). It means the temperature at the point where the straight line equidistant in the vertical axis direction from the straight line extended from each line and the curve of the step-like change part of the glass transition intersect.
  • DTA differential thermal analysis
  • DSC differential scanning calorimetry
  • extrapolated glass transition start temperature is a curve drawn by differential thermal analysis (DTA) or differential scanning calorimetry (DSC). And the temperature at the intersection of the tangent drawn at the point where the gradient of the curve of the step-like change portion of the glass transition is maximized.
  • DTA differential thermal analysis
  • DSC differential scanning calorimetry
  • extrapolated glass transition onset temperature is a curve drawn by differential thermal analysis (DTA) or differential scanning calorimetry (DSC). And the temperature at the intersection of the tangent drawn at the point where the gradient of the curve of the step-like change portion of the glass transition is maximized.
  • DTA differential thermal analysis
  • DSC differential scanning calorimetry
  • the hologram recording medium 10 when the thickness of the hologram recording medium 10 is not constant, the hologram recording medium 10 is tilted at the time of recording / reproducing of the hologram recording medium 10, so that the hologram recording medium is also used to reduce the tilt amount as much as possible.
  • the thickness of 10 needs to be constant. Therefore, the heat softening layers 15 and 17 need to have a certain degree of hardness in the recording / reproducing temperature range (for example, 10 to 80 ° C.) defined by the standard of the hologram recording medium 10.
  • there are various indices such as hardness, penetration, Young's modulus, and rigidity, but the heat softening layers 15 and 17 have a hardness of 100 Pa ⁇ s or more in terms of Young's modulus. Is desirable.
  • the rubber hardness of the heat softening layers 15 and 17 at the time of heating is 10 degrees or more lower than the rubber hardness of the heat softening layers 15 and 17 at the room temperature.
  • Room temperature generally means 25 ° C.
  • the material of the heat softening layers 15 and 17 is not particularly limited as long as it has a lower midpoint glass transition temperature than the material of the base materials 14 and 16, but for example, a polymer resin can be used. Specifically, for example, polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyvinyl acetate, Teflon, ABS resin, AS resin, acrylic resin, and derivatives and composites thereof can be used.
  • engineering plastics for example, polyamides, polyacetals, polycarbonates, modified polyphenylenes in which the glass transition temperature is controlled by molecular weight distribution control or additives. Ether, polybutylene terephthalate, polyethylene terephthalate, cyclic polyolefin) and the like can also be used.
  • the formation method of the heat softening layers 15 and 17 is not particularly limited.
  • the heat softening layers 15 and 17 may be formed on the base materials 14 and 16, or a film-like material may be attached to the base materials 14 and 16 to form the heat softening layers 15 and 17. May be.
  • a coating device such as a spin coater, bar coater, or film applicator
  • the film thickness uniformity and surface flatness of the heat softening layers 15 and 17 are determined. Can keep.
  • curing is performed by a method suitable for the material of the heat softening layers 15 and 17 such as natural curing, heat curing, and curing by UV irradiation.
  • the coated surfaces of the base materials 14 and 16 may be subjected to corona discharge treatment, plasma treatment, ozone treatment, alkali treatment or the like to improve the adhesion.
  • a liquid or gel photosensitive material precursor is formed on the surface of the thermal softening layer 17 of the second substrate 12 as shown in FIG. 18 is applied to bring the photosensitive material precursor 18 into contact with the heat softening layer 17.
  • liquid means a state in which the photosensitive material precursor flows out at least when the photosensitive material precursor is applied to the thermal softening layer
  • gel means at least the photosensitive material.
  • Examples of the method for applying the photosensitive material precursor 18 include casting and spin coating.
  • the first substrate 11 and the second substrate 12 are arranged with a predetermined gap through a spacer so that the heat softening layers 15 and 17 are inside, and the photosensitive material precursor 18 is placed in the gap. May be injected.
  • the photosensitive material precursor 18 is mainly composed of a matrix material, a radical polymerizable monomer, a photo radical polymerization initiator, and the like.
  • Matrix material examples include three-dimensional crosslinkable materials.
  • the three-dimensional crosslinkable material is three-dimensionally crosslinked by a polymerization reaction and cured.
  • Examples of the polymerization reaction of the three-dimensional crosslinkable material include cation polymerization of epoxy, cation polymerization of vinyl ether, epoxy-amine polymerization, epoxy-acid anhydride polymerization, and epoxy-mercaptan polymerization.
  • the matrix material is exemplified below, but the present invention is not limited to this.
  • Epoxy compounds include 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, 1,8-octanediol diglycidyl ether, diethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl Ether, neopentyl glycol diglycidyl ether, diepoxy octane, resorcinol diglycidyl ether, diglycidyl ether of bisphenol A, diglycidyl ether of bisphenol F, 3,4-epoxycyclohexenylmethyl-3 ′, 4′-epoxycyclohexene carboxy Rate, and epoxypropoxypropyl-terminated polydimethylsiloxane. These may be used alone or in combination of two or more.
  • epoxy compound curing agents include amines, phenols, organic acid anhydrides, and amides. Specifically, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, hexamethylenediamine, mensendiamine, isophoronediamine, bis (4-amino-3-methyldicyclohexyl) methane, bis (amino Methyl) cyclohexane, N-aminoethylpiperazine, m-xylylenediamine, 1,3-diaminopropane, 1,4-diaminobutane, trimethylhexamethylenediamine, iminobispropylamine, bis (hexamethylene) triamine, 1,3 , 6-Trisaminomethylhexane, dimethylaminopropylamine, aminoethylethanolamine, tri (methylamino) hexane, m-pheny
  • a curing catalyst may be added to the epoxy compound and the curing agent.
  • the curing catalyst include basic catalysts such as tertiary amines, organic phosphine compounds, imidazole compounds and derivatives thereof. Specifically, triethanolamine, piperidine, N, N′-dimethylpiperazine, 1,4-diazadicyclo (2,2,2) octane (triethylenediamine), pyridine, picoline, dimethylcyclohexylamine, dimethylhexylamine, benzyldimethyl Amine, 2- (dimethylaminomethyl) phenol, 2,4,6-tris (dimethylaminomethyl) phenol, 1,8-diazabicyclo [5,4,0] undec-7-ene (DBU) or a phenol salt thereof, Trimethylphosphine, triethylphosphine, tributylphosphine, triphenylphosphine, tri (p-methylphenyl) pho
  • Latent catalysts such as boron trifluoride amine complex, dicyandiamide, organic acid hydrazide, diaminomaleonitrile and its derivatives, melamine and its derivatives, amine imide and the like may be used. Curing can be accelerated by adding a compound having active hydrogen, such as phenols or salicylic acid.
  • a radical polymerizable monomer is a compound having at least one ethylenically unsaturated bond capable of radical polymerization, such as unsaturated carboxylic acid, unsaturated carboxylic acid ester, unsaturated carboxylic acid amide, and vinyl compound. Can be mentioned.
  • acrylic acid methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, lauryl acrylate, stearyl acrylate, cyclohexyl acrylate, bicyclopentenyl acrylate , Phenyl acrylate, 2,4,6-tribromophenyl acrylate, isobornyl acrylate, adamantyl acrylate, methacrylic acid, methyl methacrylate, propyl methacrylate, butyl methacrylate, phenyl methacrylate, phenoxyethyl acrylate, chlorophenyl acrylate , Adamantyl methacrylate, isobornyl methacrylate, N-methylacrylamide, N, N-dimethylacrylamide, N, N- Tylene bisacrylamide, acryloyl
  • the blending amount of the radical polymerizable monomer is preferably 1 to 50% by weight of the photosensitive material precursor 18, and more preferably 3 to 30% by weight. If the monomer is 1% by weight or more, a sufficient refractive index change can be obtained. When the radical polymerizable monomer is 50% by weight or less, the volumetric shrinkage is small and good resolution can be obtained.
  • Photoradical polymerization initiator is selected according to the wavelength of the recording light.
  • radical photopolymerization initiators include benzoin ether, benzyl ketal, benzyl, acetophenone derivatives, aminoacetophenones, benzophenone derivatives, acylphosphine oxides, triazines, imidazole derivatives, organic azide compounds, titanocenes, organic peroxides. And thioxanthone derivatives.
  • the blending amount of the photo radical polymerization initiator is preferably 0.1 to 20% by weight of the photosensitive material precursor 18, and more preferably 0.2 to 10% by weight. If the radical photopolymerization initiator is 0.1% by weight or more, a sufficient refractive index change can be obtained. When the radical photopolymerization initiator is 20% by weight or less, light absorption is small and good sensitivity and diffraction efficiency can be obtained.
  • sensitizing dyes such as cyanine, merocyanine, xanthene, coumarin, and eosin, silane coupling agents, and plasticizers may be added to the photosensitive material precursor 18 as necessary.
  • the photosensitive material precursor 18 is brought into contact with the surface of the thermal softening layer 17
  • the photosensitive material precursor is brought into contact with the photosensitive material precursor 18 as shown in FIG.
  • First substrate 11 is stacked on 18.
  • the photosensitive material precursor 18 is cured by three-dimensionally crosslinking the matrix material to form the recording layer 13.
  • the thickness of the recording layer 13 is preferably 20 ⁇ m to 2 mm, more preferably 50 ⁇ m to 1.5 mm. If the thickness of the recording layer 13 is 20 ⁇ m or more, a sufficient storage capacity can be obtained, and differentiation from conventional optical recording media such as CD and DVD can be achieved. Moreover, if the thickness of the recording layer 13 is 2 mm or less, there is no possibility that the resolution will be lowered.
  • the heat softening layers 15, 17 are formed at a temperature higher than the extrapolation glass transition start temperature (T ig ) of the heat softening layers 15, 17 and lower than the midpoint glass transition temperature of the base materials 14, 16. Heat. This heating is desirably performed from the outside of the first substrate 11 and the second substrate 12.
  • the heat softening layers 15 and 17 are heated to soften the heat softening layers 15 and 17 as shown in FIG. 3C, and the recording layer 13 is cured and contracted between the base materials 14 and 16 and the recording layer 13. The generated stress can be relaxed.
  • the thermal softening layers 15 and 17 are heated after the recording layer 13 is formed.
  • the thermal softening layers 15 and 17 are heated during the formation of the recording layer 13, that is, during curing. Also good.
  • a shortage inspection for measuring the thickness (film thickness) of the hologram recording medium 10 including the first substrate 11, the second substrate 12, and the recording layer 13 is performed.
  • the thickness of the hologram recording medium 10 does not satisfy the acceptance criteria and correction can be performed by heating the heat softening layers 15 and 17 again, the heat softening layers 15 and 17 are again used.
  • the thickness of the hologram recording medium 10 is adjusted. Specifically, when the thickness of the hologram recording medium 1 is thick, the heat softening layers 15 and 17 are heated again, and the thickness of the hologram recording medium 10 is reduced as shown in FIG. A pressure is applied to the hologram recording medium 10 to compress the hologram recording medium 10 in the thickness direction.
  • the hologram recording medium 10 When the hologram recording medium 10 is thin, the heat softening layers 15 and 17 are heated again, and the hologram recording medium 10 is thickened as shown in FIG. 4B. A pressure is applied to 10 and the hologram recording medium 10 is stretched in the thickness direction. In this embodiment, the thickness of the hologram recording medium 10 is adjusted after the stress of the recording layer 13 is relaxed. However, during the stress relaxation of the recording layer 13, that is, during the heating of the thermal softening layers 15 and 17. The thickness of the hologram recording medium 10 may be adjusted.
  • the heat softening layers 15 and 17 are provided between the base materials 14 and 16 and the recording layer 13, the heat softening layers 15 and 17 are heated after the recording layer 13 is formed.
  • the stress generated when the heat softening layers 15 and 17 are softened and the recording layer 13 is cured and shrunk can be relaxed.
  • the distortion by hardening shrinkage can be reduced.
  • no release agent is used, light scattering by the interface can be reduced without mixing light scattering sources. Therefore, the hologram recording medium 10 having excellent optical characteristics can be obtained.
  • the heat softening layers 15 and 17 are heated again to adjust the thickness of the hologram recording medium 10, so that the conventional allowable range is reached.
  • the out-of-stock items that have been outside can be made within the allowable range.
  • the number of missing items of the hologram recording medium 10 can be reduced, and the yield can be improved.
  • the stress of the recording layer 13 can be further relaxed.
  • the photosensitive material precursor 18 is brought into contact with the heat softening layers 15 and 17 from the state before curing, the adhesion between the recording layer 13 and the heat softening layers 15 and 17 can be improved.
  • FIG. 6 is a schematic longitudinal cross-sectional view of the hologram recording medium according to the present embodiment
  • FIGS. 7A to 8C are schematic views showing the manufacturing steps of the hologram recording medium according to the present embodiment.
  • a hologram recording medium 20 shown in FIG. 6 is of a reflective type, and includes a first substrate 21, a second substrate 22, and a recording layer 23.
  • the first substrate 21 and the like are arranged in the order of the first substrate 21, the recording layer 23, and the second substrate 22. That is, the recording layer 23 is sandwiched between the first substrate 21 and the second substrate 22.
  • the first substrate 21 includes a transparent base material 24 and a thermal softening layer 25.
  • the second substrate 22 includes a transparent base material 26, a reflective layer 27, a gap layer 28, and a thermal softening layer 29.
  • the base material 26 does not necessarily need to be transparent.
  • the recording layer 23 is in contact with the heat softening layers 25 and 29.
  • Such a hologram recording medium 20 can be manufactured by the following method.
  • the materials and the like of the base materials 24 and 26 and the heat softening layers 25 and 29 are the same as those of the base materials 14 and 16 and the heat softening layers 15 and 17 in the first embodiment. That is, the heat softening layers 25 and 29 are made of a material having a lower midpoint glass transition temperature (T mg ) than the base materials 24 and 26.
  • T mg midpoint glass transition temperature
  • a liquid or gel photosensitive material precursor is formed on the surface of the thermal softening layer 29 of the second substrate 22 as shown in FIG. 30 is applied to bring the photosensitive material precursor 30 into contact with the heat softening layer 29.
  • the component of the photosensitive material precursor 30 is the same as the component of the photosensitive material precursor 18, detailed description is abbreviate
  • the first substrate 21 is brought into contact with the photosensitive material precursor 30 so that the thermal softening layer 25 comes into contact with the photosensitive material precursor 30 as shown in FIG. Repeat.
  • the photosensitive material precursor 30 is cured by crosslinking the matrix material to form the recording layer 23.
  • the glass transition temperature is higher than the extrapolated glass transition start temperature (T ig ) of the heat softening layers 25 and 29 and the intermediate point glass transition temperature of the substrates 24 and 26. Heat softening layers 25 and 29 are heated at a lower temperature.
  • a missing part inspection for measuring the thickness (film thickness) of the hologram recording medium 20 is performed, and the heat softening layers 25 and 29 are heated again according to the inspection result. Then, the thickness of the hologram recording medium 20 is adjusted.
  • a hologram recording medium provided with a heat softening layer was produced, and the appearance of the hologram recording medium was observed.
  • a hologram recording medium without a heat softening layer was prepared, and appearance observation was performed in the same manner as the hologram recording medium of the example.
  • this invention is not limited to each material specified below.
  • a solution of a photosensitive material precursor was prepared.
  • This solution consists of 2.28 g of 1,6-hexanediol diglycidyl ether (Denacol Ex-212, manufactured by Nagase ChemteX Corporation) as an epoxy compound, 0.61 g of tetraethylenepentamine as a curing agent, and radical polymerization It was obtained by adding 0.15 g of 2-vinylnaphthalene as a monomer and 0.014 g of Irgacure 784 (manufactured by Ciba Specialty Chemicals) as a photo radical polymerization initiator and defoaming.
  • Irgacure 784 manufactured by Ciba Specialty Chemicals
  • the base material was placed so that the optical adhesive film faced, and a spacer of a polytetrafluoroethylene (PTFE) sheet was sandwiched, and a solution of the photosensitive material precursor was injected between the base materials.
  • PTFE polytetrafluoroethylene
  • the photosensitive material precursor solution injected between the substrates was shielded from light and allowed to stand at room temperature for 1 day, and the photosensitive material precursor solution was cured to form a recording layer.
  • the outside of the base material was sandwiched with a heater heated to 80 ° C. for 10 seconds and subjected to a heat treatment to soften the optical adhesive film.
  • a recording medium having a recording layer between the substrates was shielded from light and allowed to stand at room temperature for 3 days to produce a hologram recording medium having a recording layer having a thickness of 1000 ⁇ m.
  • the one in which the photosensitive material precursor solution was injected between the substrates was shielded from light and allowed to stand at room temperature for 1 day to cure the photosensitive material precursor solution. Formed. Thereafter, the outside of the substrate was sandwiched with a heater heated to 80 ° C. for 10 seconds, and heat treatment was performed. Thereafter, a recording medium having a recording layer between the substrates was shielded from light and allowed to stand at room temperature for 3 days to produce a hologram recording medium having a recording layer having a thickness of 1000 ⁇ m.

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Abstract

L'invention porte sur un procédé pour la production d'un support d'enregistrement d'hologramme (10), qui est caractérisé en ce qu'il comprend : une étape dans laquelle un précurseur de matériau photosensible (18) sous la forme d'un liquide ou d'un gel est amené en contact avec les surfaces de couches thermoramollissantes (15, 17) à l'aide de substrats (11, 12) qui comprennent des bases (14, 16) et des couches thermoramollissantes (15, 17) formées sur les bases (14, 16) et ayant des températures de transition vitreuse de point intermédiaire inférieur à des matériaux formant les bases (14, 16) ; une étape dans laquelle une couche d'enregistrement (13) est formée par durcissement du précurseur de matériau photosensible (18) ; et une étape dans laquelle les couches thermoramollissantes (15, 17) sont chauffées à une température supérieure aux températures d'initiation de transition vitreuse extrapolées des couches thermoramollissantes (15, 17) mais inférieure aux températures de transition vitreuse de point intermédiaire des bases (14, 16) pendant ou après la formation de la couche d'enregistrement (13).
PCT/JP2009/065106 2009-08-28 2009-08-28 Procédé pour la production d'un support d'enregistrement d'hologramme WO2011024297A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007207386A (ja) * 2006-02-03 2007-08-16 Fujifilm Corp 光記録再生装置、光記録方法及び光再生方法
JP2008152041A (ja) * 2006-12-18 2008-07-03 Toshiba Corp ホログラム記録媒体およびその製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007207386A (ja) * 2006-02-03 2007-08-16 Fujifilm Corp 光記録再生装置、光記録方法及び光再生方法
JP2008152041A (ja) * 2006-12-18 2008-07-03 Toshiba Corp ホログラム記録媒体およびその製造方法

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