Optical: systems and elements – Holographic system or element – Authentication
Patent
1995-11-29
1999-04-20
Henry, Jon
Optical: systems and elements
Holographic system or element
Authentication
359 11, 359 12, 359 15, 359 29, G02B 532, G02B 2744, G03H 114, G03H 120
Patent
active
058962085
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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Dausmann Guenther
Gnaedig Klaus
Bundesdruckerei GmbH
Henry Jon
LandOfFree
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