Patent ID: 6291109
Filing Date: 2001-09-18
Classification: G03H

Abstract:
A hologram producing method in which an image of an original plate hologram is recorded on a duplicating photosensitive material film by applying laser light to a duplicating system in which an original plate unit, which includes said original plate hologram supported by a substrate and an original plate protecting glass bonded to an upper side of said original plate hologram, is brought into close contact with a duplicating unit which includes said duplicating photosensitive material film placed in close contact with a glass selected from the group consisting of an anti-reflection coated glass, an ND glass, and an anti-reflection coated ND glass through an optical contacting liquid, wherein said optical contacting liquid has a viscosity in the range of 100 cps to 10,000 cps so that a foreign substance which may mingle during duplication is buried in said viscous optical contacting liquid, thereby reducing the incidence of depression-shaped defects caused by foreign substances, wherein said optical contacting liquid is selected from the group consisting of: Acetylacetone, Acetophenone, Anisole, Aniline, Allyl alcohol, Indene, Ethylbenzene, Ethylene glycol, Ethylenediamine, Benzoyl chloride, o-xylene, m-xylene, p-xylene, Valeric acid, Glycerin, Chlorobenzene, Chloroform, Carbon tetrachloride, Dioxane, Cyclohexanol, Cyclohexanone, Cyclohexene, Cyclopentane, 1,2-dichloroethane, Dichloromethane, Dibromomethane, Ethyl bromide, Styrene, Thiophenol, Thiophene, cis-decalin, Trans-decalin, Decane, 1-decene, Tetrachloroethylene, Tetrahydrofuran, Triethylamine, Trichloroacetaldehyde, Trichloronitromethane, o-toluidine, Toluene, Nicotine, Nitrobenzene, (+)-a-pinene, Pyridine, Pyrrole, Phenol, Butadiene, Furan, Furural, Bromobenzene, Bromoform, Benzylamine, Benzaldehyde, Benzene, Benzonitrile, 1-pentanol, Formamide, Mesitylene, Methylcyclohexane, 2-methylpyridine, Methyl iodide, Diethyl sulfide or a mixture of a plurality of compounds selected from among said group.