Master hologram for the production of copy-proof holograms
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United States of America Patent
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Apr 20, 1999
Grant Date -
N/A
app pub date -
Nov 29, 1995
filing date -
Dec 2, 1994
priority date (Note) -
Expired
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Abstract
A method for the production of holograms proof against copying and imitation possessing authenticity features, which are copies of a master hologram. In accordance with the invention as a master hologram a hologram of a randomly structured optical element, as for example a diffusion plate, which constitutes the authenticity feature, is recorded and each hologram copy produced from the master hologram is provided with a layer having at least one layer with a color succession and/or the hologram copy produced on a thick light sensitive layer is caused to shrink or to expand.
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