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Hologram and method of and apparatus for producing the same

  • US 5,985,490 A
  • Filed: 04/07/1997
  • Issued: 11/16/1999
  • Est. Priority Date: 03/31/1992
  • Status: Expired due to Term
First Claim
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1. 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, said method further comprising adding a surface active agent to said optical contacting liquid so as to increase wettability of said optical contacting liquid with respect to the base material, thereby reducing the incidence of defects caused by air trapped during duplication.

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