Master hologram for the production of copy-proof holograms

Details Master hologram for the production of copy-proof holograms Master hologram for the production of copy-proof holograms

G - Physics

03

H

G03H 1/04 (2006.01) G03H 1/16 (2006.01) G03H 1/22 (2006.01)

Patent

CA 2164358

A method for the production of copy-proof and imitation-proof holograms possessing authenticity features, which are copies of a master hologram. The method is characterized in that as a master hologram a hologram of a randomly structured optical element, as for example of a diffusion plate, which constitutes the authenticity feature, is recorded and in that each hologram copy produced from the master hologram is provided with a layer possessing at least one succession of colors and/or the hologram copy recorded on a thick light sensitive layer is caused to shrink or to expand.

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