JP2000276035A - Original plate for volume hologram, its production and method for duplication of volume hologram using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the defect of an easy tendency of an original plate to damage at the time of the mass duplication by laminating a volume hologram- forming resin composition layer between two transparent substrates. SOLUTION: The resin layer recorded with a volume hologram is laminated between the two transparent substrates. For example, non-alkali glass or quartz or transparent plastics, such as polyethylene terephthalate resins or acrylic resins, having the refractive index approximate to the refractive index of the volume hologram-forming resin layer 3 is used for the transparent substrates 2, 4. The hologram of the hologram layer 3 is preferably called as a volume hologram and is formed by recording the interference light of object light and reference light on a photosensitive material sufficiently thicker than the spacings between the interference frings and the three-dimensional constitution of the interference frings is recorded as it is. The volume hologram is recorded on the volume hologram-forming resin composition layer. The volume hologram- forming resin composition includes known volume hologram-recording materials, such as silver salt material and dichromic acid gelatin emulsion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a volume hologram duplication master suitable for duplicating a volume hologram in large quantities, and a method for producing the same.

[0002]

2. Description of the Related Art Volume holograms are used for display of stereoscopic images, measurement, and optical elements. Industrially, it is necessary to duplicate the same volume hologram in large quantities. In such a case, it was performed as follows.
First, calculation is performed using an electronic computer so that the hologram has necessary characteristics, and the calculation result is drawn on a photomask blank plate by an electron beam drawing machine to obtain the first hologram master. Separately, a volume hologram-forming resin composition is applied on a glass substrate to prepare a volume hologram-forming substrate, and the hologram obtained above is placed on the resin composition layer of the volume hologram-forming substrate. The hologram master and the volume hologram forming substrate are overlapped so that the mask surface of the master is in contact with the mask, and the hologram master is exposed to laser light from the hologram master side. After the exposure, each step of ultraviolet irradiation (decomposition of the photopolymerization initiator) and heat treatment (diffusion transfer of the photopolymerizable compound) is performed to form a hologram master for forming a volume hologram coated on a glass substrate. Replicated in the resin composition layer.

[0003] Conventionally, the hologram thus duplicated is
Further, as a duplication master, a volume hologram-forming substrate similar to that described above is prepared, and the hologram layer side is brought into contact with the volume hologram-forming substrate, and is exposed, thereby producing a volume hologram. I was However, in the prior art, the hologram layer of the volume hologram duplication master is exposed, and when directly brought into close contact with the volume hologram formation substrate, it is very easily damaged, and through an index matching liquid to eliminate the difference in refractive index. Even if it is brought into close contact with the substrate for volume hologram formation by applying a protective paint, etc., the duplicate master will be damaged if it is duplicated several times. I had to make it and it was extremely inefficient.

[0004]

SUMMARY OF THE INVENTION As described above, the object of the present invention is to solve the problem that when a large number of copies are made using a hologram obtained by copying the first hologram as a master, the disadvantage that the master is easily damaged is eliminated. An object of the present invention is to provide a hologram duplication master, a method of manufacturing the same, and a method of duplicating a volume hologram using the same.

[0005]

According to the present invention, a volume hologram-forming resin composition for forming a hologram layer is used to prepare a master for duplication, and the resin composition is conventionally coated on a single transparent substrate. What has been done is to use two transparent substrates and to laminate the volume hologram-forming resin composition layer between them, thereby eliminating the inconvenience caused by the prior art.

[0006] The invention of claim 1 relates to a volume hologram duplication master, wherein a resin layer on which a volume hologram is recorded is laminated between two transparent substrates.

[0007] The invention of claim 2 relates to the volume hologram duplication master according to claim 1, wherein the transparent substrate is a glass plate.

According to a third aspect of the present invention, on the first transparent substrate,
A layer of the photosensitive resin composition for forming a volume hologram, and a second transparent substrate are sequentially laminated to prepare a laminate for forming a volume hologram, and after the preparation, one of the laminates for forming a volume hologram is formed. Expose the volume hologram formed on a separate mask from the transparent substrate side using light that can interfere,
Thereafter, the present invention relates to a method for producing a volume hologram duplication master characterized by developing.

According to a fourth aspect of the present invention, there is provided a method in which a resin composition layer for forming a volume hologram is laminated on a transparent substrate, and the resin composition layer for forming a volume hologram is provided between the two transparent substrates. After closely contacting the volume hologram duplication plate on which the resin layer on which the volume hologram is recorded is laminated, the volume hologram duplication original plate is exposed to light using coherent light, and then developed. And a method of replicating a volume hologram.

[0010]

FIG. 1 is a sectional view showing a volume hologram duplication master 1 of the present invention. In FIG. 1, reference numerals 2 and 4 denote transparent substrates, for example, alkali-free glass and alkali. Transparent plastics such as glass, quartz, or polyethylene terephthalate resin, polyolefin resin, polycarbonate resin, or acrylic resin. As these transparent substrates, those having a refractive index close to that of the volume hologram forming resin layer 3 are used, and those having a refractive index in the range of 1.40 to 1.55 are particularly preferably used. The thickness of the transparent substrate is not particularly limited as long as it can support the resin layer for forming a volume hologram, but a thickness in the range of 40 μm to 200 μm is preferable in terms of bending strength and uniformity. Above all, when a glass plate is used as a transparent substrate, it is not only hard and not easily scratched, and it is easy to clean with a liquid detergent or a soft cloth each time it is replicated, and it is also easy to clean. In particular, the use of a transparent substrate on the side where the volume hologram-forming resin composition layer is brought into contact is extremely significant, since it is not damaged during the formation. Further, among the transparent plastics, an acrylic resin is preferable from the viewpoint of the refractive index.

Reference numeral 3 denotes a hologram layer in which a hologram is formed on a resin composition layer for forming a volume hologram. The hologram of the hologram layer 3 is preferably called a volume hologram, in which interference light between object light and reference light is recorded on a photosensitive material sufficiently thicker than the interval between interference fringes. The three-dimensional structure is recorded as it is. This volume hologram can be formed by directly recording the interference light between the object light and the reference light on the volume hologram forming resin composition layer, or by contact-exposing the original volume hologram. It is obtained by duplication, and as in the present invention, industrially,
According to the latter method.

In general, examples of the resin composition for forming a volume hologram include known volume hologram recording materials such as a silver salt material, a gelatin dichromate emulsion, a photopolymerizable resin, and a photocrosslinkable resin. Uses, from the viewpoint of production efficiency, a photosensitive material for dry volume phase hologram recording composed of a matrix polymer, a photopolymerizable compound, a photopolymerization initiator, and a sensitizing dye as a resin composition for forming a volume hologram. Is preferred.

The matrix polymer as the binder resin includes polymethacrylic ester or its partial hydrolyzate, polyvinyl acetate or its hydrolyzate, polyvinyl alcohol or its partial acetalized product, triacetyl cellulose, polyisoprene, polybutadiene, polychloroprene. , Silicone rubber, polystyrene, polyvinyl butyral, polychloroprene, polyvinyl chloride, chlorinated polyethylene, chlorinated polypropylene, poly-N-vinylcarbazole or derivatives thereof, poly-N
-Vinylpyrrolidone or a derivative thereof, a copolymer of styrene and maleic anhydride or a half ester thereof, acrylic acid, acrylic ester, methacrylic acid, methacrylic ester, acrylamide, acrylonitrile, ethylene, propylene, vinyl chloride, vinyl acetate, etc. A copolymer or the like having at least one of the copolymerizable monomer groups as a polymerization component, or a mixture thereof is used. Preferably polyisoprene, polybutadiene, polychloroprene, polyvinyl alcohol, or polyvinyl acetal which is a partially acetalized product of polyvinyl alcohol, polyvinyl butyral, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, or the like, or a mixture thereof. .

As a step of stabilizing the recorded hologram, there is a step of monomer transfer by heating. For this purpose, these matrix polymers preferably have a relatively low glass transition temperature and facilitate monomer transfer. It is necessary.

Examples of the photopolymerizable compound include photopolymerizable and photocrosslinkable monomers and oligomers having at least one ethylenically unsaturated bond in one molecule as described below.
Prepolymers, and mixtures thereof, for example, unsaturated carboxylic acids and salts thereof, esters of unsaturated carboxylic acids and aliphatic polyhydric alcohol compounds, unsaturated carboxylic acids and aliphatic polyhydric amine compounds and Amide bond.

Specific examples of unsaturated carboxylic acid monomers include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, and their halogen-substituted unsaturated carboxylic acids such as chlorinated unsaturated carboxylic acids. , Brominated unsaturated carboxylic acids, fluorinated unsaturated carboxylic acids, and the like. Examples of the salts of unsaturated carboxylic acids include the above-mentioned sodium salts and potassium salts.

Specific examples of the monomer of the ester of an aliphatic polyhydric alcohol compound and an unsaturated carboxylic acid include acrylates such as ethylene glycol diacrylate, triethylene glycol diacrylate, and 1,3-butanediol diacrylate. Acrylate, tetramethylene glycol diacrylate, propylene glycol diacrylate, neopentyl glycol diacrylate, trimethylolpropane triacrylate, trimethylolpropane tri (acryloyloxypropyl) ether, trimethylolethane triacrylate, 1,4-cyclohexanediol diacrylate Acrylate,
Tetraethylene glycol diacrylate, pentaerythritol diacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol diacrylate, dipentaerythritol triacrylate, dipentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, sorbitol triacrylate, sorbitol Tetraacrylate, sorbitol pentaacrylate, sorbitol hexaacrylate, tri (acryloyloxyethyl) isocyanurate, polyester acrylate oligomer, 2-phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, phenol ethoxylate monoacrylate, 2- (p-
(Chlorophenoxy) ethyl acrylate, p-chlorophenyl acrylate, phenyl acrylate, 2-phenylethyl acrylate, (2-acryloxyethyl) ether of bisphenol A, ethoxylated bisphenol A diacrylate, 2- (1-naphthyloxy) ethyl Acrylate and o-biphenyl acrylate.

Among the specific examples of the ester monomer of the aliphatic polyhydric alcohol compound and the unsaturated carboxylic acid, methacrylic acid esters include tetramethylene glycol dimethacrylate, triethylene glycol dimethacrylate, neopentyl glycol dimethacrylate, Methylol propane trimethacrylate, trimethylol ethane trimethacrylate, ethylene glycol dimethacrylate, 1,3-butanediol dimethacrylate, hexanediol dimethacrylate, pentaerythritol dimethacrylate, pentaerythritol trimethacrylate, dipentaerythritol dimethacrylate, dipentaerythritol hexa Methacrylate,
Sorbitol trimethacrylate, sorbitol tetramethacrylate, bis- [p- (3-methacryloxy-2-hydroxypropoxy) phenyl] dimethylmethane, bis- [p- (acryloxyethoxyphenyl)
Examples include dimethylmethane, 2,2-bis (4-methacryloyloxyphenyl) propane, and 2-naphthyl methacrylate.

Among specific examples of the ester monomer of the aliphatic polyhydric alcohol compound and the unsaturated carboxylic acid, itaconic esters include ethylene glycol diitaconate, propylene glycol diitaconate, and 1,3-
Butanediol diitaconate, 1,4-butanediol diitaconate, tetramethylene glycol diitaconate, pentaethasritol diitaconate, sorbitol tetritaconate, and the like.

Among the specific examples of the ester monomer of the aliphatic polyhydric alcohol compound and the unsaturated carboxylic acid, crotonates include ethylene glycol dicrotonate, tetramethylene glycol dicrotonate, pentaerythritol dicrotonate, Sorbitol tetracrotonate and the like.

Among the specific examples of the ester monomer of the aliphatic polyhydric alcohol compound and the unsaturated carboxylic acid, the isocrotonic acid esters include ethylene glycol diisocrotonate, pentaerythritol diisocrotonate, and sorbitol tetraisocrotonate. Etc.

Among the specific examples of the ester monomer of the aliphatic polyhydric alcohol compound and the unsaturated carboxylic acid, maleic esters include ethylene glycol dimaleate, triethylene glycol dimaleate, pentaerythritol dimaleate, Sorbitol tetramaleate and the like.

The halogenated unsaturated carboxylic acids include
2,2,3,3-tetrafluoropropyl acrylate, 1H, 1H, 2H, 2H-heptadecafluorodecyl acrylate, 2,2,3,3-tetrafluoropropyl methacrylate, 1H, 1H, 2H, 2H-heptadeca Fluorodecyl methacrylate, methacrylic acid
2,4,6-tribromophenyl, dibromoneopentyl dimethacrylate, (trade name; NK ester DBN,
Shin-Nakamura Chemical Co., Ltd.), dibromopropyl acrylate (trade name: NK Ester A-DBP, Shin-Nakamura Chemical Co., Ltd.), dibromopropyl methacrylate (trade name: NK Ester DBP, Shin-Nakamura Chemical Co., Ltd.) )),
Methacrylic acid chloride, methacrylic acid-2,4,6-
Trichlorophenyl, p-chlorostyrene, methyl-2
-Chloroacrylate, ethyl-2-chloroacrylate, n-butyl-2-chloroacrylate, tribromophenol acrylate, tetrabromophenol acrylate and the like.

Specific examples of the amide monomer of an unsaturated carboxylic acid and an aliphatic polyamine compound include methylenebisacrylamide, methylenebismethacrylamide, 1,6-hexamethylenebisacrylamide,
6-Hexamethylenebismethacrylamide, diethylenetriaminetrisacrylamide, xylylenebisacrylamide, xylylenebismethacrylamide, N-phenylmethacrylamide, diacetoneacrylamide and the like.

As another example, see JP-B-48-417.
08, a polyisocyanate compound having two or more isocyanate groups in one molecule, a compound represented by the general formula CH
₂ ＣC (R) COOCH ₂ (R ′) OH (wherein R and R ′
Represents hydrogen or a methyl group. A) a vinyl urethane compound containing two or more polymerizable vinyl groups in one molecule to which a vinyl monomer having a hydroxyl group is added.

Urethane acrylates described in JP-A-51-37193, JP-A-48-6418
No. 3, JP-B-49-43191, JP-B-52
Polyester acrylates and polyfunctional acrylate methacrylates such as an epoxy group and (meth) acrylic acid as described in JP-A-30490 can be exemplified.

Further, the Journal of the Adhesion Society of Japan, Vol. 20, N
o. 7, those introduced as photocurable monomers and oligomers on pages 300 to 308 can also be used.

Other monomers containing phosphorus include mono (acryloyloxyethyl) acid phosphate (trade name: Light Ester PA, manufactured by Kyoeisha Yushi Kagaku Kogyo KK) and mono (2-methacryloyloxyethyl) acid Phosphate (trade name; light ester PM,
Kyoeisha Yushi Kagaku Kogyo Co., Ltd.), and an epoxy acrylate-based product name; Lipoxy VR-60
(Trade name (Lipoxy VR-90, manufactured by Showa Polymer Co., Ltd.)
(Manufactured by Showa Polymer Co., Ltd.).

Trade name: NK ester M-230G
(Manufactured by Shin-Nakamura Chemical Co., Ltd.), trade name: NK ester 2
3G (manufactured by Shin-Nakamura Chemical Co., Ltd.) is also included.

Further, triacrylates having the following structure

[0031]

Embedded image

(Trade name: Aronix M-315, manufactured by Toa Gosei Chemical Industry Co., Ltd.), triacrylates having the following structure

[0033]

Embedded image

(Trade name: Aronix M-325, manufactured by Toa Gosei Chemical Industry Co., Ltd.), and 2,2'-bis (4-
Acryloxy diethoxyphenylpropane (trade name;
NK ester A-BPE-4), tetramethylolmethanetetraacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name: NK ester A-TMMT) and the like.

Next, as a photopolymerization initiator in the initiator system, 1,3-di (t-butyldioxycarbonyl) benzophenone, 3,3 ', 4,4'-tetrakis (t-
(Butyldioxycarbonyl) benzophenone, N-phenylglycine, 2,4,6-tris (trichloromethyl) s-triazine, 3-phenyl-5-isoxazolone, 2-mercaptobenzimidazole, imidazole dimer, etc. Is exemplified. The photopolymerization initiator is preferably decomposed after recording the hologram from the viewpoint of stabilizing the recorded hologram. For example, organic peroxides are preferred because they are easily decomposed by ultraviolet irradiation.

The sensitizing dyes include thiopyrylium salt dyes, merocyanine dyes, quinoline dyes, styrylquinoline dyes, ketocoumarin dyes, thioxanthene dyes, xanthene dyes, and oxonol dyes having absorption light at 350 to 600 nm. Dyes, cyanine dyes, rhodamine dyes, thiopyrylium salt dyes, pyrylium ion dyes, and diphenyliodonium ion dyes are exemplified. A sensitizing dye having absorption light in a wavelength region of 350 nm or less or 600 nm or more may be present.

It comprises the above-mentioned matrix polymer, a photopolymerizable compound, a photopolymerization initiator and a sensitizing dye.
The mixing ratio of the volume hologram-forming resin composition is as follows. The photopolymerizable compound is a binder resin 100
It is used in an amount of 10 parts by weight to 1000 parts by weight, preferably 10 parts by weight to 100 parts by weight based on parts by weight. The photopolymerization initiator is used in an amount of 1 to 10 parts by weight, preferably 5 to 10 parts by weight, based on 100 parts by weight of the binder resin. The sensitizing dye is used in an amount of 0.01 part by weight to 1 part by weight, preferably 0.1 part by weight, per 100 parts by weight of the binder resin.
It is used in a proportion of from 01 parts by weight to 0.5 parts by weight.

Other components of the resin composition for forming a volume hologram include, for example, a plasticizer, glycerin, diethylene glycol, triethylene glycol and various nonionic surfactants, cationic surfactants, and anionic surfactants. Activators.

The resin composition for forming a volume hologram includes acetone, methyl ethyl ketone, methyl isobutyl ketone,
Cyclohexanone, benzene, toluene, xylene, chlorobenzene, tetrahydrofuran, methyl cellosolve, ethyl cellosolve, methyl cellosolve acetate,
Ethyl cellosolve acetate, ethyl acetate, 1,4-dioxane, 1,2-dichloroethane, dichloromethane,
Use chloroform, methanol, ethanol, isopropanol, etc., or a mixed solvent thereof to obtain a solid content of 15%.
% To about 25%. In addition, as such a coating liquid, for example, Omnidex 3 manufactured by DuPont
Those commercially available as 52 and 706 may be used.

Using these coating liquids, as shown in FIG. 2, bar coating, spin coating, dipping, or the like, on one of the transparent substrates 2, 4 or on both transparent substrates 2 and 4, or , A gravure roll coat, a roll coat, a die coat, or a comma coat, and the like, and immediately after the application, both were combined and pressurized, or were solidified by means of drying or curing according to the coating solution. Thereafter, the two are combined and heated and pressed as necessary to obtain a laminate in which the volume hologram-forming resin composition layer 30 is sandwiched between the two substrates 2 and 4. At this time, avoid contact with the entire surface at once while slightly bending the substrate so that air bubbles do not enter,
It is good to make contact linearly. Note that the resin composition for forming a volume hologram may be applied to one transparent substrate using a spinner, and another transparent substrate may be immediately superimposed and bonded together by rotating together. Whichever method is employed, unless the resin composition for forming a volume hologram is a solventless type, after pressurizing, while pressurizing, or releasing the pressure, and drying over time, or drying, depressurizing, heating, or the like Adhesion is carried out using, for example, (1) prior to drying, after adhering, and then for a certain period of time (preferably 1 to
After being left for 10 hours), it is preferable to dry by heating, since the uniformity is improved. Alternatively, (2) after applying the resin composition for forming a volume hologram, the composition may be dried by heating, and a transparent substrate may be bonded using the inherent adhesiveness of the resin composition for forming a volume hologram. The thickness of the volume hologram-forming resin composition layer 30 is 0.1 μm to 5 μm.
0 μm, preferably 5 μm to 20 μm.

As shown in FIG. 4, the obtained laminate comprising the transparent substrate 2, the resin composition layer 30 for forming a volume hologram, and the transparent substrate 4 is exposed using a hologram master 5 as shown in FIG. . The hologram master used is obtained by calculating using an electronic computer so as to generate necessary characteristics, and drawing the calculation result on a surface of a photomask blank plate or the like by using an electron beam drawing machine. The hologram master 5 is brought into close contact, and a laser beam 8 such as an argon laser (wavelength: 514.5 nm) is incident from the hologram master 5 side,
Perform exposure. By this exposure, the light diffracted by the diffraction grating of the hologram master interferes with the light that has not been diffracted,
This is to provide hologram information in the volume hologram-forming resin composition. The distance between the hologramgram master and the volume hologram-forming resin composition layer at the time of exposure is closer (usually in close contact) or farther than the position where the incident and diffracted light interferes with the undiffracted light. The width of the area where the interference fringes occur is adjusted by fixing the width.

[0042] After exposure, ultra-high pressure mercury lamp, high pressure mercury lamp, carbon arc, xenon arc, from a light source such as a metal halide lamp, 0.1~10,000mJ / cm ^2, preferably, the 10~1,000mJ / cm ² UV A stable volume hologram is obtained by sequentially passing through a step of decomposing the photopolymerization initiator by irradiation and a step of diffusing and moving the photopolymerizable compound by heat treatment, for example, heating at 120 ° C. for 120 minutes. These ultraviolet irradiation and heating constitute a development step.

When the hologram layer 3 obtained above is laminated between two transparent substrates 2 and 4 and used as a volume hologram duplication master, a volume hologram is produced by the method shown in FIG. Can be mass-replicated.

For this mass duplication, a duplication material 11 having a volume hologram forming resin composition layer 10 laminated on a transparent substrate 9 is prepared. As the duplication master, the volume hologram duplication master 1 obtained above is used, and this duplication master 1 is brought into close contact with the volume hologram forming resin composition layer 10. At the time of adhesion, when the volume hologram duplication master 1 is manufactured, the side on which the coherent light is incident (the transparent substrate 2 side in FIGS. 4 and 5) is brought into close contact. In this case, as in the case where the volume hologram duplication master is manufactured, the hologram may be fixed at intervals without being closely attached. Thereafter, exposure is performed from the side of the volume hologram duplication plate 1 using the coherent light 8 and development is performed to obtain a duplicate having a hologram layer of a volume hologram on a transparent substrate.

[0045]

According to the first aspect of the present invention, the volume hologram duplication master used conventionally has a synthetic resin hologram layer exposed on a transparent substrate or has a protective coating of a synthetic resin. Because it was a structure that was laminated between two transparent substrates, it was possible to directly contact the volume hologram forming resin composition layer, which is the material to be copied, at the time of exposure,
It is extremely unlikely to be damaged and can be used repeatedly for 50 or more duplications, eliminating the need for the volume hologram duplication master to be repeatedly attached to the hologram original. In addition, it is easy to clean the side directly contacting the resin composition layer for forming a volume hologram, and there is no need to separately form a protective film.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the volume hologram duplication master is particularly damaged when it comes into contact with the side directly contacting the volume hologram-forming resin composition layer. In addition, damage during cleaning is extremely unlikely to occur each time copying is performed, and the production efficiency is extremely high.

According to the third aspect of the present invention, the volume hologram duplication master according to the first aspect of the present invention is obtained by simply using two transparent substrates and laminating a volume hologram-forming resin composition layer therebetween. By exposing and developing the hologram master from one side, it can be easily manufactured, and there is no need to form a protective film.

According to the fourth aspect of the present invention, the volume hologram duplication original plate according to the first aspect of the present invention is used, and the close exposure is performed on the volume hologram forming resin composition layer on the transparent substrate,
By developing, the volume hologram can be easily formed, and there is little trouble in replacing the replica master or, in some cases, making a new replica master due to damage to the volume hologram replica master. It is easy to clean the master plate, and it is possible to replicate a large number of volume holograms very efficiently.

[Brief description of the drawings]

FIG. 1 is a view conceptually showing the structure of a duplication master.

FIG. 2 is a diagram illustrating a process of manufacturing a duplication master.

FIG. 3 is a view showing a process of manufacturing a duplication master.

FIG. 4 is a diagram showing a process of manufacturing a duplication master.

FIG. 5 is a diagram showing a step of performing duplication using a duplication master.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Volume hologram replica master 2, 4, 9 Transparent substrate 3 Hologram layer 5 Hologram master 6 Glass substrate 8 Laser beam 10, 30 Volume hologram forming resin composition layer 11 Copy material

Claims (4)

[Claims] An original master for duplicating a volume hologram, wherein a resin layer on which a volume hologram is recorded is laminated between two transparent substrates. 2. The volume hologram duplication master according to claim 1, wherein the transparent substrate is a glass plate. 3. A volume hologram-forming photosensitive resin composition layer and a second transparent substrate are sequentially laminated on a first transparent substrate to prepare a volume hologram-forming laminate. A volume hologram replica, characterized in that a volume hologram formed on a separate mask is exposed to light from one transparent substrate side of the laminate for forming a volume hologram using light capable of interfering, and then developed. The method of manufacturing the master plate. 4. A volume hologram-forming resin composition layer laminated on a transparent substrate is prepared, and a volume hologram is recorded between two transparent substrates on the volume hologram-forming resin composition layer. After the volume hologram duplication master on which the resin layer is laminated is brought into close contact, from the volume hologram duplication master side, exposure is performed using light capable of interfering, and then development is performed. Duplication method.