Patent ID: 6052209
Filing Date: 2000-04-18
Classification: G03H

Abstract:
A method for replicating an original volume hologram plate having an image of a scattering body recorded therein according to a hologram replicating technique comprising the steps of:providing replicating illumination light incident on said original volume hologram plate at an angle of incidence I.sub.1 at which a group of fringes can be replicated and recorded in a replicated hologram,said group of fringes in said replicated hologram being such that, in the vicinity of an apex defined by a slant angle S.sub.g at which said replicated hologram can be viewed at a viewing center angle .phi. upon illumination at an illumination angle .theta., a recording degree of said group of fringes in said replicated hologram becomes weaker more quickly at positions farther away from said slant angle S.sub.g than a recording degree of a group of fringes in said original volume hologram plate at corresponding positions away from said slant angle relative to said original volume hologram plate,characterized in that the angle of incidence I.sub.1 satisfies the following equation (6): ##EQU4## where: I.sub.0 is an angle of incidence of reference light to record the original volume hologram plate,.lambda..sub.0 is a wavelength at which the original volume hologram plate is recorded,.nu..sub.0 is a degree of shrinkage of a photographic material with the original volume hologram plate recorded therein,.tau..sub.0 is a slant angle change of fringes recorded in the original volume hologram plate,.lambda..sub.1 is a wavelength to replicate the original volume hologram plate,.tau..sub.1 is a slant angle change of replicated fringes,n.sub.0 is an external refractive index of the photographic material, andn.sub.1 is an internal refractive index of the photographic material.