WO2005109114A1 - ホログラフィック記録メディア、ホログラフィック記録方法及びホログラフィック情報メディア - Google Patents
ホログラフィック記録メディア、ホログラフィック記録方法及びホログラフィック情報メディア Download PDFInfo
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- WO2005109114A1 WO2005109114A1 PCT/JP2005/008052 JP2005008052W WO2005109114A1 WO 2005109114 A1 WO2005109114 A1 WO 2005109114A1 JP 2005008052 W JP2005008052 W JP 2005008052W WO 2005109114 A1 WO2005109114 A1 WO 2005109114A1
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Classifications
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- 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
- 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
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
- G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
- G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins
- G11B7/2534—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins polycarbonates [PC]
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
- G11B7/2585—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers based on aluminium
Definitions
- the present invention relates to a holographic recording medium capable of large-capacity and high-speed transfer, and further relates to a holographic recording method and a holographic information medium on which information is recorded.
- Such a holographic recording medium records information by changing the refractive index in a holographic recording layer in the medium by holographic exposure, and
- the basic principle is that information is reproduced by reading the change in the refractive index in the medium on which is recorded.
- a material using an inorganic material for example, see Patent Document 3
- Various materials have been proposed, such as a material using a compound that undergoes structural isomerism by light (for example, see Patent Document 4) or a material that uses diffusion polymerization of a photopolymer (for example, see Patent Document 5).
- a holographic recording layer forming composition (for example, refer to Patent Document 6) using a solvent-free cationic polymerization with relatively small system shrinkage has been proposed.
- the recording layer-forming composition is a liquid substance other than the monomer that causes photothion polymerization, the island-like portion formed by photopolymerization of the monomer in the recording layer by holographic exposure is used.
- the liquid may move, and the volume of the liquid substance expands due to a change in the environmental temperature in the apparatus.
- radical polymerization is used for recording in holographic exposure, and a composition in which a noinder is formed after the formation of the media in order to retain the radically polymerizable monomer before the exposure.
- a composition in which a noinder is formed after the formation of the media in order to retain the radically polymerizable monomer before the exposure.
- Patent Document 7 a composition in which a noinder is formed after the formation of the media in order to retain the radically polymerizable monomer before the exposure.
- Non-Patent Document 1 Hans J. Coufal et al., “: Holographic Data Storage (Springer Series in Optical Sciences, Vol. 76)” (Springer—Verlag GmbH & Co. K. G, August 2000)
- Patent Document 1 U.S. Pat.No. 5,719,691
- Patent Document 2 JP-A-2002-123949
- Patent Document 3 UK Patent No. 9,929, 953
- Patent Document 4 JP-A-10-340479
- Patent Document 5 U.S. Pat.No. 4,942,112
- Patent Document 6 U.S. Patent No. 5,759,721
- Patent Document 7 U.S. Patent No. 6,482,551
- Patent Document 8 U.S. Patent No. 6,348,983
- Patent Document 9 U.S. Patent No. 6,611,365
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a holographic recording medium, a holographic recording method, and a holographic recording medium which are less sensitive to a device, have higher sensitivity, and are excellent in storability.
- An object of the present invention is to provide a holographic information medium on which holographic data is recorded.
- An antireflection layer a first base material, a binder-forming compound, a photopolymerizable compound having a photopolymerizable functional group, and photopolymerization capable of initiating a polymerization reaction of the photopolymerizable compound.
- a holographic recording medium in which a holographic recording layer containing an initiator and a second substrate are laminated in this order, wherein at least one of the first substrate and the second substrate has an ASTM D1003 force.
- a holographic recording medium characterized in that it is a plastic substrate having a total light transmittance of 90% or more with a thickness of 3 mm specified by the above.
- a holographic recording method for recording information on the holographic recording medium comprising reacting the binder-forming compound to form a binder, and forming the information from the side where the antireflection layer is laminated.
- the holographic exposure activates the photopolymerization initiator to generate active species.
- a holographic recording method wherein the photopolymerizable compound is subjected to diffusion polymerization in the holographic recording layer by an active species.
- an antireflection layer a first base material, a region mainly composed of a binder formed from a binder-forming compound, and a photopolymerizable compound having a photopolymerizable functional group are used.
- a holographic information recording layer having, in this order, a holographic information recording layer having a region having a higher refractive index than a region having a polymer as a main component and the binder as a main component, and a second substrate.
- a medium, wherein at least one force of the first base material and the second base material is a plastic base material having a total light transmittance of 90% or more having a thickness of 3 mm specified by ASTM D1003. Holographic information media.
- a holographic recording medium it is possible to obtain a holographic recording medium, a holographic recording method, and a holographic information information medium on which holographic recording is performed, in which the load on the apparatus is small, the sensitivity is high, and the storage properties are excellent.
- FIG. 1 is a cross-sectional view illustrating a layer structure of a holographic recording medium and a holographic information medium of the present invention.
- 1 (a) to 1 (c) are cross-sectional views illustrating the layer structure of the holographic recording medium and the holographic information medium of the present invention.
- the holographic recording medium and the holographic information medium of the present invention include a holographic recording layer 4 described later or a holographic information recording layer 4 described later. Sandwiched between the first substrate 1 and the second substrate 2 and further the first substrate
- 1 is based on a layer configuration in which an antireflection layer is provided.
- a reflective layer may be provided on the second base material 2.
- the reflection layer may be provided between the holographic recording layer 4 or the holographic information recording layer 4 and the second recording layer 2 as shown in FIG.
- the holographic recording medium for performing hologram recording on the holographic recording layer by irradiating the information light and the reference light from the first base material side comprises a first base material and a second base material.
- a holographic recording layer containing at least is sandwiched, at least one of the first substrate and the second substrate is a plastic substrate, and the plastic substrate is a 3 mm-thick total light beam specified by ASTM D1003.
- the antireflection layer has a transmittance of 90% or more and is provided with an antireflection layer laminated on at least the surface of the first substrate on the side where the information light and the reference light are incident.
- At least one of the first base material and the second base material is formed of the plastic base material, and the base material surface on which the information light and the reference light are incident from the first base material side
- the mass of the optical recording medium itself can be reduced, and a photopolymerization initiator can be activated at the time of information recording not only to prevent the sensitivity from deteriorating due to reflection.
- a compound having at least one group is diffused and polymerized in the holographic recording layer, it can prevent permeation of moisture, oxygen, and the like, which act as an inhibitory factor.
- the resin used for the plastic substrate according to the present invention can be used without particular limitation as long as the total light transmittance of a 3 mm thickness specified by ASTM D1003 is 90% or more.
- the resin used for the plastic substrate according to the present invention can be used without particular limitation as long as the total light transmittance of a 3 mm thickness specified by ASTM D1003 is 90% or more.
- a resin having a cyclic olefin as a monomer unit, 1,1-bis (4-hydroxyphenyl) cyclohexane is particularly preferred.
- the use of at least one of the above is preferable for the purpose of preventing the deformation of the medium at the time of manufacture, preventing the deterioration of the recording sensitivity, or reducing the error rate.
- the total light transmittance does not become 100%, it is desirable that the total light transmittance be as high as possible.
- Examples of the resin having a cyclic olefin as a monomer unit include, for example, JP-A-5-25220, JP-A-5-247324, JP-A-5-279554, JP-A-6-80864, JP-A-6-107735, JP-A-6-107736. No. 6-136035, No. 6-136057, No. 7-41550, No. 7-62068, No. 7-324108, No. 9-263627, No. 10-152549, No.
- a resin can be selected and used as appropriate.
- Zeonex, Zeonor [manufactured by Nippon Zeon Co., Ltd.], Aton Q1SR Co., Ltd., and Abel [Mitsui Iridaku] are marketed under the product names!
- Examples of the resin having 1,1 bis (4-hydroxyphenyl) cyclohexane as a monomer unit include 1,1 bis (4-hydroxyphenyl) cyclohexane and a polyvalent carboxylic acid compound. Examples thereof include an ester polymer obtained by direct polymerization, and a polycarbonate containing at least 1,1 bis (4-hydroxyphenyl) cyclohexane as a monomer unit as a bisphenol component.
- 1,1-bis (4-hydroxyphenol) -1,3,3,5 A resin having trimethylcyclohexane as a monomer unit includes 1,1-bis (4-hydroxyphenyl) -1,3.
- Polymer obtained by direct polymerization of 1,3,5 trimethylcyclohexane and polycarboxylic acid conjugate, 1,1 bis (4-hydroxyphenyl) -3,3,5 trimethylcyclo as a bisphenol component examples thereof include polycarbonates containing hexane as a monomer unit, and copolycarbonates described in JP-A-2-88638 and the like can be appropriately selected and used within the scope of the present invention.
- the resin having the structural unit of the general formula (1) can be obtained by subjecting a compound having two hydroxyl groups to a condensation reaction with epichlorohydrin.
- Any compound having two hydroxyl groups capable of a condensation reaction with epichlorohydrin as a structural unit can be used without particular limitation.
- diols such as 1,4-dihydroxycyclohexane, 1,4-dihydroxynaphthalene, 1,5 dihydroxynaphthalene, 4,4'-dihydroxybiphenyl and 2,2'bis (4-hydroxycyclohexyl) propane Can be listed.
- Z in the structural unit of the general formula (1) represents a divalent linking group
- the structural force represented by the following general formula (2) As the Z represented by the general formula (2), which is more preferable because it can suppress deformation when used as a substrate having a higher height, the following structures can be exemplified. However, the structure is not particularly limited as long as it is within the scope of the present invention. [0031] [Formula 2]
- G represents one O-SSOso, a linking group of a carbon chain
- R represents hydrogen, or a substituent such as an alkyl group, an alkoxy group, or a halogen.
- n represents an integer from 0 to 4,
- the resin used in the base material according to the present invention may further have a glass transition temperature of 100 ° C or more, 250 ° C due to problems of mechanical strength and crosslinking conditions for forming a binder from a binder-forming compound described in detail below. It is preferable that the temperature be not more than ° C.
- the glass transition temperature When the force is lower than S100 ° C, the base material may be deformed depending on the crosslinking conditions for forming the binder.If the glass transition temperature is higher than 250 ° C, it is not preferable. In the case of molding by injection or the like, it is not preferable because the “fusing melting” kneading conditions and the mold temperature / cylinder one temperature become high and the molding conditions become severe.
- the functional group strength of a compound having at least one photopolymerizable functional group contained in the holographic recording layer such as an S radical polymerizable group having an unsaturated double bond, such as an acryl group having an unsaturated double bond, or methacryloyl.
- the oxygen permeability defined by ASTM D3985 of ⁇ forming the plastic substrate described above can 1000cm 3 ⁇ ⁇ ( ⁇ 2 ⁇ 241 ⁇ :
- a resin having a cyclic olefin as a monomer unit is particularly preferable.
- the lower limit of the oxygen permeability is 10 cm 3 ⁇ mm / (m 2 ⁇ 24 hr ⁇ MPa).
- the binder-forming compound contained in the holographic recording layer is formed by cationic polymerization
- the purpose is to prevent the polymerization reaction due to moisture from being inhibited or to prevent a predetermined binder physical property from being obtained.
- a functional group of a compound having at least one photopolymerizable functional group such as a cationic polymerizable group, for example, a functional group having an epoxy group or an oxetane group that is ring-opened and polymerized by a cation.
- the refractive index of the base material changes due to the reduction of sensitivity or the moisture contained in the base material.In other words, an error occurs during reproduction due to the environment where the media is left when recording and reproducing recorded data.
- the above-mentioned plastic substrate is formed.
- the resin has a water absorption rate of less than 0.05% (23 ° C, 1 week) specified by ASTM D570.
- Rukoto preferred instrument further it is more preferable moisture permeability defined by ASTM F1249 is 0. 20gZ (m 2 '24hr) or less.
- the first base material on the side on which the information light and the reference light are incident on the holographic recording medium, and the first base material on the side on which the readout light is incident on the holographic information medium are provided.
- the anti-reflection layer will be described in detail.
- the anti-reflection layer provided on the side of the first substrate on which the incident light is incident has a 90-degree force in the vertical direction using the same light source as the incident light in order to increase the efficiency of the incident light.
- the reflectance should be 2% or less when incident light is incident, and more preferably 1% or less. It is strongly preferred.
- Such an antireflection layer is not particularly limited as long as it has a lower refractive index than the first base material.
- inorganic metal fluorides such as A1F, MgF, A1F-MgF, and CaF,
- Organic compounds such as homopolymers, copolymers, graft polymers and block polymers containing fluorine atoms such as bi-lidene fluoride and Teflon (registered trademark), and modified polymers modified with functional groups containing fluorine atoms.
- Fluoride, SiO, etc. are those described in detail above as base materials
- the refractive index is lower than that.
- the method of providing the layer composed of the compound described above on the base material cannot be unequivocally determined depending on the type of the base material and the compound, but a sol-gel method, a vacuum deposition method, a sputtering method, A known method such as a CVD method or a coating method, or a method described in JP-A-7-27902, JP-A-2001-123264, JP-A-2001-264509, or the like can be appropriately selected and used. .
- a multilayer antireflection film comprising a plurality of low-refractive index layers and a plurality of high-refractive index layers which are used for antireflection of plastic lenses and optical members can also be suitably used in the present invention.
- Examples of such a multilayer antireflection film include, for example, JP-A-5-142401, JP-A-5-249303, JP-A-6-3504, JP-A-6-331803, JP-A-7-35902, JP-A-7-253501, and JP-A-11-25.
- the layer configuration and method described in each publication of 311702 can be selected and used as appropriate.
- the thickness of such a single-layer or multi-layer antireflection layer cannot be specified unconditionally depending on the material of the base material and the like, but usually ranges from 0.001 to 20111, and is preferably 0.0005 to 10 ⁇ m.
- holographic recording media and holographic information such as those used in holographic recording and reproducing apparatuses described in US Patent Nos. 5,838,467 and 6,700,686.
- the holographic recording layer or holographic information recording layer of the second base material is A single-layer or multi-layer anti-reflection layer may be further provided on the surface opposite to the side on which the light is provided, in other words, on the side having the light receiving portion for receiving light.
- a reflective layer having a reflectivity of 80% or more on at least one of the surface on which the base material holographic recording layer is laminated or the opposite surface. It is preferable that the reflectivity be 80% or more, and more preferably 85% or more, with respect to the wavelength.
- Such a reflective layer is not particularly limited in its material as long as a desired reflectance is obtained, but can be usually laminated by providing a thin film of a metal or the like on the surface of the base material.
- a metal thin film or a metal single crystal or a polycrystal is laminated by a known method such as a vacuum evaporation method, an ion plating method, or a sputtering method.
- the metals used for laminating metal thin films include aluminum, zinc, antimony, indium, selenium, tin, tantalum, chromium, lead, gold, silver, platinum, nickel, niobium, germanium, and silicon.
- Molybdenum, manganese, tungsten, palladium, and other metals can be used alone or in combination of two or more.
- the thickness of the metal thin film layer may be any thickness as long as the desired reflectance can be obtained, but is usually in the range of 1 to 3000 nm, preferably in the range of 5 to 2000 nm.
- the holographic recording medium of the present invention similarly to a known optical recording disc such as a CD or DVD, in order to track information to be recorded or a position of the recorded information media, Examples of such a pattern or forming method that allows a physical pattern to be formed on one surface of any of the base materials include, for example, JP-A-2003-178456, JP-A-2003-228875, and JP-A-2003-228875.
- JP-A-2003-178456, JP-A-2003-228875, and JP-A-2003-228875 JP-A-2003-228875.
- Each of the publications described in US Pat. No. 3,314,64, US Pat. No. 6,625,100, and US Patent Application Publication No. 2004Z0042375 may be appropriately selected and formed as appropriate.
- the holographic recording medium if at least one of the first base material and the second base material is the above-described plastic base material, the holographic recording medium formed of glass on both sides. , The mass can be reduced.
- glass substrates that can be used as substrates other than plastic substrates include, for example, quartz glass, soda glass, polycarbonate glass, lead crystal glass, borosilicate glass, aluminosilicate glass, titanium crystal glass, and! /, Glass such as crystallized glass can be appropriately selected and used together with the plastic substrate.
- both the first substrate and the second substrate are plastic substrates.
- a recording medium having a high storage capacity can be manufactured by making the holographic recording layer as thick as possible.
- the thickness of the first substrate is Dl
- the thickness of the second substrate is D2
- the thickness of the holographic recording layer is Dh. It is preferable to satisfy the relationship of 0.15 ⁇ Dh / (Dl + D2) ⁇ 2.0.
- the thickness of the holographic recording layer cannot be increased, or even if the thickness of the recording layer is increased, the base material becomes thicker, and the entire recording medium become thicker. In this case, the mass of the recording medium alone is heavy and a load may be applied to the drive system of the apparatus, which is not preferable.
- DhZ (Dl + D2)> 2.0 it is possible to reduce the thickness of the recording medium while securing the thickness of the recording layer.
- the thickness of the recording layer becomes uneven due to the surface accuracy of the recording medium and the temperature of the operating environment, and the thickness of the recording layer fluctuates when unexpected stress is applied. It is not preferable because it may shift.
- the surface area of energy loss during holographic exposure is preferably such that the relationship between the thickness Dl of the first base material and the thickness D2 of the second base material is Dl ⁇ D2.
- the ratio of the thickness of D1 and D2 is more preferably in the range of 0.20 ⁇ D1 / D2 ⁇ 1.00.
- the thickness Dh of the holographic recording layer cannot be determined unconditionally due to the diffraction efficiency, dynamic range, spatial resolution and the like of the recording layer, but is usually preferably 200 / zm or more and 2.Omm or less. If the thickness is less than 200 m, a recording medium with a high storage capacity cannot be obtained. 2. If the thickness is greater than Omm, unevenness in the surface accuracy of the recording medium and the thickness of the recording layer at the ambient temperature may occur. This is not preferred because of the fact.
- the shape of the holographic recording medium there is no particular limitation as long as it is suitable for the holographic recording / reproducing apparatus to be used. For example, it is used for the apparatus described in US Pat. No. 5,719,691 and JP-A-2002-123949. If the device is a disk-shaped device, a card-shaped device is preferable if an apparatus described in International Publication No. 99Z57719 is used.
- the holographic recording layer laminated on the holographic recording medium of the present invention comprises a binder-forming compound, a compound having at least one photopolymerizable functional group, and at least the photopolymerizable functional group. It contains at least a photopolymerization initiator capable of initiating a polymerization reaction of the compound having one compound.
- the binder-forming compound according to the present invention does not polymerize or crosslink between the binder-forming compounds when the holographic recording composition is prepared, but polymerizes or crosslinks when producing a holographic recording medium described later. It is characterized by being used as a binder.
- examples of the binder-forming compound include (1) a compound having an isocyanate group and a compound having a hydroxyl group, (2) a compound having an isocyanate group and a compound having an amino group, and (3) (4) a compound having a carpoimide group and a compound having a carboxyl group, (4) a compound having an unsaturated ester group and a compound having an amino group, (5) a compound having an unsaturated ester group and a compound having a mercaptan group, (6) vinyl Group-containing compound and silicon hydride group-containing compound, (7) oxysilane group-containing compound and mercaptan group-containing compound, and (8) oxysilane, oxetane, tetrahydrofuran, oxepane, monocyclic acetal, bicyclic acetal, ratatone, cyclic Contains at least one group selected from orthoester and cyclic carbonate in the molecule Combinations of
- the compounds selected from the above can be polymerized or crosslinked to a binder under mild conditions (1) a compound having an isocyanate group and a compound having a hydroxyl group, (2) a compound having an oxylan group and a mercaptan group. And (3) oxolane, oxeta Compound having at least one group selected from the group consisting of ethylene, tetrahydrofuran, oxepane, monocyclic acetal, bicyclic acetal, ratatone, cyclic orthoester, and cyclic carbonate, and at least one combination of thermal acid generators Is more preferred.
- the compound having an isocyanate group used in the case of forming a binder by crosslinking is not particularly one that does not hinder the object of the present invention.
- two compounds can be used in the molecule.
- Such a compound having an isocyanate group which are preferred by the above-mentioned compound having an isocyanate group include, for example, 1,8 diisocyanate-4 isocyanate methyl-octane, 2 isocyanateethyl-2 , 6 diisocyanate-proate, benzene-1,3,5 triisocyanate, 1-methylbenzene-1,2 4,6 triisocyanate, 1,3,5 Trimethylbenzene 1,2,6 triisocyanate, diphenylmethane-2,4,4 'triisocyanate, triphenylmethane 4, 4', A "triisocyanate , Bis (isocyanatotolyl) phenol, dimethylene diisocyanate, tetramethylenediocyanate, hexanemethylene diisocyanate, 2,2-dimethylpentanedisocyanate, 2,2,4 trimethylpentanediisonate Cyanate, decanediisocyanate,
- these isocyanate conjugates may be used alone or in combination of two or more.
- a holographic recording medium in which a recording layer composed of a holographic recording composition described in detail below is laminated, and the recording is completed.
- the holographic information media used in the same way as CDs and DVs may have various varieties of ambient temperature under fluorescent lights, windowsills or left behind. Therefore, those which suppress the coloring of the recording layer under various conditions are preferable. In order to suppress such coloring, among the above-mentioned compounds, aliphatic isocyanate conjugates are more preferable.
- the combination of the compound having an isocyanate group and the compound having a hydroxyl group in (1) does not particularly hinder the object of the present invention as a compound having an isocyanate group used in the case of forming a binder by crosslinking.
- Any compound can be used without limitation, but in order to form a high molecular weight binder by a cross-linking reaction with the compound having two or more hydroxyl groups in the molecule described above, two or more hydroxyl groups in the molecule are required. In order to make it easier to control the hardness measured with a durometer, a compound having two or more aliphatic alcoholic hydroxyl groups in the molecule is more preferable.
- Diethylene glycol triethylene glycol, polyethylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol, 2,2-dimethyl-1,3-propanediol, 2,2 dimethyl-1,3-propanediol, 2-butyl-2-ethyl-1,3-propanediol , 1,2 butanediol, 1,4 butanediol, polytetramethylene glycol, 1,5 pentanediol, 2-methyl-2,4 pentanediol, 3-methyl-1,5 pentanediol, 1,6 hexanediol, 2 -Ethyl-1,3 hexanediol, 2,5 dimethyl-2,5 hexanediol, 1,10 decanediol, 1,4-cyclohexanediol, g
- the molecular weight of the compound having two or more aliphatic alcoholic hydroxyl groups in the molecule may be a compound having a volatility of the compound itself, a compound having an ethylenically unsaturated bond, a compound having a cationically polymerizable functional group.
- the molecular weight be 100 or more and 2000 or less, and that the compound having two or more aliphatic alcoholic hydroxyl groups in the molecule is used.
- a compound having an oxysilane group and a compound having a mercaptan group are polymerized to obtain a polymer.
- a known crosslinkable compound can be used without particular limitation.
- the holographic recording medium of the present invention is manufactured, it is liquid at normal temperature !, is to sandwich the liquid recording composition at a predetermined thickness between two substrates at a temperature of 100 ° C or less. Therefore, a compound which is liquid at room temperature or has a melting point of 100 ° C. is preferable, and a compound having two or more oxysilane groups or mercaptan groups is more preferable.
- a Bronsted base or a Lewis base in order to polymerize under milder conditions.
- bases include amines such as pyridine, piperidine, dimethylaline, 2,4,6-tris (dimethylaminomethyl) benzene, and 2,4,6-tris (dimethylaminomethyl) phenol. Things can be mentioned.
- a compound having at least one group selected from oxysilane, oxetane, tetrahydrofuran, oxepane, monocyclic acetal, bicyclic acetal, ratatone, cyclic orthoester and cyclic carbonate in a molecule is crosslinked with a thermal acid generator.
- the compound used in this case can be used without any particular limitation as long as it has the above-mentioned functional group, but when producing the holographic recording medium of the present invention, which will be described in detail later, it is not liquid at room temperature.
- thermal polymerization initiator capable of cross-linking the above-mentioned compound having an oxysilane or oxetane group in the molecule
- any one which does not adversely affect the other essential components according to the present invention can be used.
- Sulfonium salts, ammonium salts, phosphonium salts, and other such salts, as well as silanol and aluminum complexes can be used without particular limitation.Of these thermal polymerization initiators, the other essential components must be heated to 150 ° C or higher. No problem with high temperature heating Pama, JP-A-58-37003, JP-A-63-223002, etc.
- Alkyl sulfonium salts and compounds capable of initiating polymerization at low temperatures include JP-A-63-8365, JP-A-63-8366, JP-A-1-83060, JP-A-1-290658, — 1470, 2—196812, 2—232253, 3—17101, 3—47164, 3—48654, 3—145459, 3—200761, 3—237107 Nos. 4-1177, 4-210673, 8-188569, 8-188570, 11-29609, 11-255739, and JP-A-2001-55374.
- the compounds described may be mentioned, and such thermal polymerization initiators may be used alone or in combination of two or more as needed.
- the thermal polymerization initiator described in detail above can also utilize a carboxy cation generated by thermal cleavage of the initiation itself to initiate polymerization of a compound having an oxsilane or oxetane group in the molecule.
- a compound having a proton donating functional group such as a hydroxyl group
- the carbon cation formed by cleavage reacts with the compound having a proton donating functional group.
- the resulting proton is used as a polymerization initiator for a compound having an oxsilane or oxetane group in the molecule.
- the amount of the above-mentioned thermal polymerization initiator to be added is usually 0.01 part by mass or more and 10 parts by mass with respect to 100 parts by mass of the compound having a cationically polymerizable oxsilane or oxetane group in the molecule.
- the range is as follows, preferably in the range of 0.05 to 5 parts by mass.
- the difference in refractive index between the binder that forms the above-mentioned binder-forming compound and the polymer of the compound having at least one photopolymerizable functional group obtained by diffusion polymerization is determined.
- the refractive index of the compound having at least one photopolymerizable functional group at a level that is not practically problematic such as a decrease in transmittance or an increase in haze
- the difference in the refractive index between the polymer formed from a compound having at least one or more functional groups and the binder resin formed from the binder-forming compound be as large as possible.
- Glycol acrylate paratamyl phenoxyethylene glycol meta acrylate, hydroxyethylated o-phenyl phenol acrylate, hydroxyethylated j8-naphthol acrylate, triblemo-fule atalylate, triblemo-fure methacrylate , Toldophenol metathallate, polyethylene oxide Modified tetrabromobisphenol A diatalylate, polyethylene oxide modified tetrabromobisphenol A dimetharylate, bis (4-methacryloylthiophenol) sulfide, JP-A-6-301322, JP-A-2000-344716, and 2003-29604 And the compounds having a fluorene skeleton described in each gazette of the publication.
- the composition of the holographic recording layer forming composition is also within a range that does not impair the purpose of providing a refractive index difference between the formed binder and the diffusion polymer of the compound having an ethylenically unsaturated bond.
- a compound having a (meth) atalyloyl group having a refractive index of less than 1.55 is further added.
- the above-mentioned compound having an ethylenically unsaturated bond in the molecule may be used singly or in combination of two or more kinds, and is usually 1.0 mass in the holographic recording composition. % To 50% by mass, and more preferably 4.0% to 40% by mass.
- the photopolymerization initiator for photopolymerizing a compound having an ethylenically unsaturated bond as the compound having at least one photopolymerizable functional group according to the present invention generates radicals by light.
- benzoin and its derivatives carboxy compounds such as benzophenone, azoi conjugates such as azobisisobutymouth-tolyl, sulfur compounds such as dibenzothiazolyl sulfide, benzoyl benzoyl Peroxides such as oxides, halides such as 2-tribromomethanesulfonylpyridine, quaternary ammonium salts, or substituted or unsubstituted diphenylodonium salts, and triphenylsulfonium salts.
- Pemide compounds 2,2-bis (o-chlorophenol) —4,4 ', 5,5'-Bisimidazo such as tetraphenyl-biimidazole Compounds, (7-6-cumene) (7-5-cyclopentagel) iron (1+) hexafluorophosphate and other iron complexes and di- ⁇ (5) -cyclo
- Known ⁇ -complexes such as titanocene complexes such as pentagelbis [2,6-difluoro-3- (pyrrol-1-yl) phenyl] titanium (IV), and complexes of cationic dyes with borate-ones
- Photopolymerization initiators can be selected and used at appropriate times, and among these, at least one compound selected from the group consisting of bisimidazole derivative, metal ⁇ complex, and complex of cationic dye with borate-one.
- an iron arene complex is more preferable than the force sensitivity and the surface strength of stability.
- the photopolymerization initiator does not have or has absorption with respect to the wavelength of a laser light source used for holographic exposure of the photopolymerization initiator with respect to the wavelength of an exposure light source used for holographic exposure described later.
- the amount is extremely small, it is more preferable to use a sensitizing dye for sensitizing the spectral wavelength of the photopolymerization initiator.
- Photopolymerization initiators or sensitizing dyes include, for example, U.S. Patent Nos. 5,027,436, 5,096,790, 5,147,758, 5, 20, 4, 467, 5, 256, 520, 6, 011, 180, European Patent 255, 486, 256, 981, 277, 915, 318, 893 Nos.
- Examples of the photopolymerization initiator for photopolymerizing the above-mentioned compound having an ethylenically unsaturated bond include the molecular weight of the photopolymerization initiator and the molecular weight of the ethylenically unsaturated bond in the compound having an ethylenically unsaturated bond. Although it cannot be determined unconditionally according to the proportion of the compound, it is usually preferred to use 0.01 to 25 parts by mass of the compound having an ethylenically unsaturated bond.
- the sensitizing dye is preferably used in an amount of 0.01 to 25 parts by mass based on the photopolymerization initiator.
- the holographic recording layer is formed by mixing the holographic recording composition by heating at room temperature or as needed under safelight. After preparing the composition and degassing in order to suppress polymerization inhibition at the time of holographic exposure, the temperature of the holographic recording layer forming composition, which is at room temperature on the first substrate, is increased as necessary. Then, after bonding the second base material so that air bubbles do not enter so that the thickness of the second base material becomes the specified thickness, recording is performed by sealing the end at the end. Media can be manufactured.
- the first base material and the second base material are fixed to a mold under a safe light so as to have a predetermined gap, and at room temperature, if necessary, the heated holodala recording composition is bubbled. Fill the space between the first base material and the second base material by injection molding so as not to enter or suction under reduced pressure so that air bubbles do not enter, and finally manufacture the recording media by sealing the ends be able to.
- under safelight refers to an operation in a state where the wavelength of light at which the photopolymerization initiator becomes active is cut.
- the holographic recording layer forming composition may be attached to a second substrate instead of the first substrate described above, It may be applied to both the first and second substrates.
- a liquid sealing material such as a moisture-curable adhesive capable of sealing is used.
- the holographic recording layer may be sealed by using an end sealing material or the like on the ring in order to secure a predetermined film thickness.
- a binder-forming compound is reacted to form a binder, and then holographic exposure based on information to be recorded is performed.
- a holographic recording layer forming composition is prepared without a solvent for diluting.
- a solid or high viscosity composition For a solid or high viscosity composition, a uniform film thickness is obtained. It is difficult to remove bubbles trapped during preparation. Therefore, fluidity is required at room temperature or in a heated state when the composition for forming a hodoraphic recording layer is prepared.
- the holographic recording layer forming composition is liquid at room temperature and has low viscosity, it is difficult to secure flatness as a holographic recording medium, or after recording information by holographic exposure.
- a polymer formed from a compound having at least one functional group capable of photopolymerization is not preferred because the position may be shifted in the recording layer.
- a holographic recording medium containing the above-mentioned essential components is crosslinked with a binder-forming compound before the holographic exposure to form a binder.
- the polymer formed by diffusion polymerization of a compound having at least one possible functional group can be prevented from moving in the holographic recording layer.
- the recorded! / Holographic exposure based on the information is performed, the photopolymerization initiator is activated, and the photopolymerization is enabled by the active species.
- Information can be recorded on a holographic recording medium by diffusing and polymerizing a compound having at least one functional group.
- the holographic recording method of the present invention in the crosslinking reaction for forming the above-mentioned binder, all combinations of reactive functional groups may be crosslinked, or a range in which practical problems do not occur. It is possible to cross-link only a part. Further, after the information is recorded on the holographic recording medium, the photopolymerization remaining in the recording layer by light and heat applied as necessary for the purpose of fixing the recorded holographic information.
- a compound having at least one possible functional group is photopolymerized with a photopolymerization initiator, and if there is an uncrosslinked functional group in the binder-forming compound, the uncrosslinked functional groups are thermally crosslinked. preferable. In this case, it is preferable that the light used for the exposure is applied to the entire holographic recording medium at once. Alternatively, a plurality of heat treatments may be combined.
- the apparatus for recording and reproducing the holographic recording medium used in the holographic recording method of the present invention is not particularly limited as long as it can record and reproduce the holographic recording medium of the present invention.
- Examples of such a recording / reproducing apparatus include, for example, U.S. Pat. Nos. 5,719,691, 5,838,467, 6,163,391, 6,414,296 and U.S. Pat.
- JP-A-2002Z136143 JP-A-9-305 978, JP-A-10-124872, JP-A-11-219540, JP-A-2000-98862, JP-A-2000-298837, JP-A-2001-23169, Publications 2002-83431, 2002-123949, 2002-123948, 2003-43904, WO 99/57719 And those described in each pamphlet and the like of JP-A Nos. 02Z05270 and 02Z75727.
- a laser light source capable of activating holographic recording by activating a photopolymerization initiator in a recording medium and reading a recorded hologram.
- Any light source can be used without limitation.
- Examples of such a light source include a semiconductor laser in the blue-violet region, an argon laser, a He—Cd laser, a frequency doubled YAG laser, a He—Ne laser, a Kr laser, and a near-field laser. Examples thereof include semiconductor lasers in the infrared region.
- the holographic recording medium before recording and the holographic recording medium to which the recorded information may possibly be added in a small amount have a wavelength of a light source usually used for holographic recording of nm. , ( ⁇ + 100) nm or less, preferably ( ⁇ + 200) nm or less, and stored in a case or cassette that can at least block light, and the holographic recording medium is exposed to laser light for recording. Information is recorded by taking out from the case or cassette and irradiating it with laser light in a light-shielded state only when the operation is performed.
- the holographic recording medium on which information is recorded by the holographic recording method of the present invention can be taken out of the above-mentioned light-shielding case or cassette, and handled in a light room like a CD or DVD. It can be used as a holographic information medium that can be used.
- the holographic information medium that makes this read light incident on the first base material side and reproduces information by light transmitted from the second base material side is composed of the first base material and the second base material.
- Holographic information recording containing at least a polymer formed by polymerization of a binder resin formed from a binder-forming compound and a compound having at least one photopolymerizable functional group by a photopolymerization initiator
- a layer is sandwiched, and at least one of the first substrate and the second substrate is a plastic substrate, and the plastic substrate has a total light transmittance of 90% or more having a thickness of 3 mm specified by ASTM D1003.
- an antireflection layer is laminated on at least the surface of the first substrate on the side where the readout light is incident, and the holographic information recording layer is a low refractive index binder formed from the binder forming compound.
- a holographic information medium that causes read light to enter from the first base material side and reproduces information by light reflected from the first base material side is a second base of the above-described information medium.
- a reflective layer having a reflectance of 80% or more is laminated on at least one surface of the material in contact with the holographic information recording layer or on the opposite surface thereof, and the holographic information recording layer is formed of a low refractive index formed from the binder forming compound.
- a compound having at least one photopolymerizable functional group having a higher refractive index than the region containing the binder as the main component and being formed by polymerization with the photopolymerization initiator. And a region having a polymer as a main component.
- the following base materials were prepared as base materials having a thickness of 0.5 ⁇ 0.05 mm.
- the surface accuracy of the substrate is ⁇ 3 ⁇ , and the total light transmittance is a value at a thickness of 3 mm specified by ASTM D1003.
- the surface accuracy is a measured value of the reflected wavefront accuracy measured at 632 nm.
- An anti-reflection layer or a reflection layer is provided on one side of the above-described base material by the following surface treatment method, and the prepared base materials 1-1 to 1-4 (that is, 3-1 to 3-4), an anti-reflection layer Table 1 shows laminated base materials (layered with anti-reflection layer on substrate) 15 to 122, reflective layer laminated substrates (layered with reflective layer on base material) 2-1 to 2-5 Show.
- the mass ratio per unit area in the table is a relative value when the mass of the substrate 1-1 is set to 100 for the substrates 1-1 to 1-4, and the antireflection layer laminated substrate 1-5 to :
- the relative value when the mass of the antireflection layer laminated substrate 1-5 is 100, and for the reflective layer laminated substrate 2-1 to 2--5, the reflective layer laminated substrate 2-1 mass This is a relative value when 100 is set.
- An anti-reflection layer is provided on the substrate by vacuum deposition of MgF to achieve the reflectance shown in Table 1.
- SiO / ZrO / Al O-based 5-layer anti-reflection film is formed by vacuum evaporation from the substrate side to SiO,
- the films of ZrO, SiO, O, and SiO + A1 O were changed to ⁇ 0/12, ⁇ 0/2, ⁇ 0 /
- ⁇ is the wavelength of light 5
- Aluminum was provided on the substrate by a vacuum evaporation method to a thickness of 100 nm.
- OOOg of bisphenoxyethanol full orange atalylate BPEFA, manufactured by Osaka Gas Co., Ltd.
- BPEFA 2,6-di
- Solution A is prepared by mixing and dissolving —4—methylphenol, and then 0.50 g of (7.6-tamene) (7.5-cyclopentagel) iron (1+) hexafluo is added to this solution A. After adding and dissolving the lophosphate, the solution was added to the solution 1 described above, and the finally prepared composition was deaerated with nitrogen.Then, the airborne components were removed by an ultrasonic cleaner, A holographic recording layer forming composition 1 was prepared.
- composition 2 was prepared by removing the gas components contained in the mixture using an ultrasonic cleaner.
- the base material and the anti-reflection layer laminated base material in Table 1 are the first base material and the first anti-reflection layer laminated base material (0.5 mm in thickness: D1), and the second base material and the second anti-reflection layer.
- the laminated base material thickness 0.5 mm: D2
- the thickness of the recording layer shown in Table 2 the thickness of the recording layer shown in Table 2) Dh
- the resin sheet was used as a spacer
- the holographic recording layer-forming composition described in Table 2 was applied to the first base material.
- Holographic 1st substrate and holographic 2nd substrate and ripening conditions Record refuse If only Dh D / unit surface ⁇ self-measured per unit ⁇ first anti-reflection Composition Second anti-reflection layer Degree ⁇ Time (hr) (mm) (D1 + D2) Contribution ratio
- the aluminum-deposited surface of the laminated base material is bonded onto the holographic recording layer forming composition so as not to entrap the air layer, and the first base material and the reflective layer laminated base material are bonded through a spacer. I combined. Finally, the end was sealed with a moisture-curable adhesive, and the binder-forming compound was cross-linked under the cross-linking conditions shown in Table 3 to produce a holographic recording medium.
- the mass ratio per unit area in the table is a relative value when the mass of the holographic recording medium 27 is 100.
- the holographic recording media produced as described above were left for one week at a temperature of 23 ° C and a humidity of 40% in the shade (normal storage), and stored for one week at a temperature of 40 ° C and a humidity of 90% ( (High-humidity storage) and a series of multiplexed holograms were written according to the procedure described in US Pat. No. 5,719,691, and the sensitivity (recording energy) was measured and evaluated according to the following method. Table 4 shows the results.
- a digital pattern is displayed on a holographic recording medium that is normally stored using a holographic manufacturing device equipped with an Nd: YAG laser (532 nm), and this digital pattern is formed with an energy of 0.1 to 30 mi / cm 2.
- Hologram was obtained by holographic exposure.
- the holographic recording medium was left under a 20 W white fluorescent lamp at a distance of 20 cm for 1 hour.
- a Nd: YAG laser (532 nm) as a reference light
- the recording medium left under the fluorescent light is read as a reference light, and the generated reproduction light is read by a CCD. It was measured as (S11).
- the holographic recording medium stored at high humidity was evaluated in the same manner as described above, and the minimum exposure at which a good digital pattern was reproduced was measured as the sensitivity (S12).
- the holographic recording medium of the present invention is lighter in weight than the comparative example and highly sensitive before and after storage.
- the holographic recording medium manufactured as described above was left for 1 week at 23 ° C and 40% humidity in the shade (normal storage), and 1 week at 23 ° C and 0% humidity in an oxygen atmosphere.
- the storage (oxygen storage) was evaluated in the same manner as in recording and evaluation 1 on the holographic recording medium.
- Table 5 shows the obtained results.
- S21 is the minimum exposure of the holographic recording media normally stored
- S22 is the minimum exposure of the holographic recording media stored in oxygen.
- the holographic recording medium of the present invention is lighter in weight than the comparative example and highly sensitive before and after storage.
- the holographic recording media produced as described above were left for one week at a temperature of 23 ° C and a humidity of 40% in the shade (normal storage), and stored for one week at a temperature of 40 ° C and a humidity of 90% ( High humidity storage) and a series of multiple holograms were written according to the procedure described in JP-A-2002-123949, and the sensitivity (recording energy) was measured and evaluated according to the following method, and the obtained results were tabulated.
- Figure 6 shows.
- Self-media 27 1 00 4.7 5.1 imm Self-media 28 56 5.5 1 0 im B Self-media 29 56 6.5 1 1 imm Self-media 30 51 6.0 7.5 Ratio ⁇ (Sequence $ Media 31 1 00 2.2 2.7 Invention Media 32 56 2.4 2.9 Invented self-media 33 56 2.7 3.1 Invented I Self-media 34 51 2.3 2.8 Invented media 35 50 2.3 2.8 Invented media 36 53 1.8 1.8 Invented media 37 53 2.0 2.5 Recording medium of the present invention 38 51 1.7 .1.9 Media recording of the present invention 39 51 1.8 2.1 2.1 Recording medium of the present invention 41 51 1.7 2.0 Recording medium of the present invention 41 50 1.7 .1 .9 Self-Media of the Present Invention 42 50 1.7 .1.9 Media of the Present Invention 43 50 1.7.1.9 Self-Media of the Present Invention 44 50 2.9 3.1 Self-Media of the Present Invention 45 50 2.7 2.9 Self-Media of the Present Invention 46 50
- the holographic recording medium of the present invention is lighter in weight than the comparative example and has high sensitivity before and after storage.
- the holographic recording medium manufactured as described above was left for 1 week at 23 ° C and 40% humidity in the shade (normal storage), and 1 week at 23 ° C and 0% humidity in an oxygen atmosphere.
- the stored product (oxygen storage) was evaluated in the same manner as in the recording and evaluation 3 on the holographic recording medium. Table 7 shows the obtained results. In the table, the minimum exposure of the holographic recording medium normally stored is indicated by S41, and the minimum exposure of the holographic recording medium stored by oxygen is indicated by S42.
- the holographic recording medium of the present invention is lighter in weight than the comparative example and has high sensitivity before and after storage.
- the holographic recording media prepared as described above were left for 2 weeks at a temperature of 23 ° C and a humidity of 40% under light shielding (normal storage), and for one week at a temperature of 40 ° C and a humidity of 90%, followed by oxygen.
- Samples stored for 1 week at 23 ° C. and 0% humidity in an atmosphere (high-humidity / oxygen storage) were evaluated in the same manner as in the above-mentioned holographic recording medium recording and evaluation 3.
- Table 8 shows the obtained results.
- S51 is the minimum exposure of the holographic recording medium normally stored
- S52 is the minimum exposure of the holographic recording medium stored in oxygen and high humidity.
- the holographic recording medium of the present invention is lighter in mass than the comparative example and highly sensitive before and after storage.
- the holographic information media prepared from the normally stored holographic recording media shown in Tables 4 to 8, in which the recorded information is fixed, are stored under the following conditions, and before and after storage, digital data is recorded in a method suitable for each information media.
- the reproduction of the pattern was evaluated, and the ratio of reproducing the digital pattern was evaluated by the following method. Table 9 shows the obtained results.
- the holographic information media was immersed in water and stored for one week, and the percentage of digital patterns that could be reproduced before and after storage was calculated.
- the media immersed in water was taken out, and then used for 12 hours at a temperature of 23 ° C and a humidity of 50%.
- Reproducible ratio (Es) (number of digital patterns that could be reproduced after saving) Z (number of digital patterns that could be reproduced before saving) X 100
- Reproducible ratio (Eh) (number of digital patterns that could be reproduced after saving) Z (before saving (Number of digital patterns that can be played)
- the holographic information medium of the present invention is lighter in weight than the comparative example and has a lower error rate when reproduced before and after storage.
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Abstract
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2005
- 2005-04-27 EP EP05737353A patent/EP1746469A1/en not_active Withdrawn
- 2005-04-27 JP JP2006512968A patent/JPWO2005109114A1/ja active Pending
- 2005-04-27 WO PCT/JP2005/008052 patent/WO2005109114A1/ja not_active Application Discontinuation
- 2005-05-04 US US11/121,488 patent/US20050250016A1/en not_active Abandoned
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008139768A (ja) * | 2006-12-05 | 2008-06-19 | Mitsubishi Chemicals Corp | ホログラム光記録媒体 |
JP2013510204A (ja) * | 2009-11-03 | 2013-03-21 | バイエル・マテリアルサイエンス・アクチェンゲゼルシャフト | 異なった書込コモノマーを含有する感光性ポリマー組成物 |
JP2011081907A (ja) * | 2011-01-07 | 2011-04-21 | Sony Corp | 光情報記録媒体 |
Also Published As
Publication number | Publication date |
---|---|
EP1746469A1 (en) | 2007-01-24 |
US20050250016A1 (en) | 2005-11-10 |
JPWO2005109114A1 (ja) | 2008-03-21 |
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