Optical: systems and elements – Holographic system or element – Copying by holographic means
Patent
1998-04-20
2000-08-01
Henry, Jon
Optical: systems and elements
Holographic system or element
Copying by holographic means
359 24, 359 28, 430 1, 430 2, G03H 120, G03H 128
Patent
active
060975148
ABSTRACT:
The invention relates to a method for replicating a volume hologram having an image of a scattering object recorded therein according to a hologram replicating technique, wherein the diffraction 13 of unnecessary light due to zero-order light, etc. arising from regular reflection and a visual range capable of viewing a recorded image is limited to a desired range .alpha., so that the image can be displayed more brightly than would be possible with the original hologram plate, and a volume hologram as well. When replicating a volume hologram 4' having an image O' of a scattering body recorded therein, replicating illumination light is incident on the volume hologram 4' at an angle of incidence I.sub.1 at which a group of fringes can be replicated and recorded, said group of fringes being such that, in the vicinity of an apex defined by a supposed slant angle S.sub.g at which a replicated hologram 4' can be viewed at a supposed viewing center angle .phi. within a range .alpha. upon illumination with illumination light 7 at a supposed illumination angle .theta., a recording degree of said group of fringes becomes weaker at a position farther away from said slant angle S.sub.g.
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Dai Nippon Printing Co. Ltd.
Henry Jon
LandOfFree
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