Process for the manufacture of non-replicable holograms possessi

Details Process for the manufacture of non-replicable holograms possessi Process for the manufacture of non-replicable holograms possessi

1996-09-25

1999-08-24

Spyrou, Cassandra

Optical: systems and elements

Holographic system or element

Authentication

359 12, 359 28, G03H 100

Patent

active

059431440

ABSTRACT:
A process for the manufacture of non-replicable holograms possessing authenticity features which are copies of a master hologram. To form a master hologram, a hologram is taken of a randomly structured optical element, for example of a ground glass screen or a diffusor. The resulting hologram forms an authenticity feature, with an optical system which leads to a hologram with a pattern of lines that are parallel to one another.

REFERENCES:
patent: 3894756 (1975-07-01), Ward
patent: 5825514 (1998-10-01), Dausmann et al.
Translation of Japanese patent publication 6-110377, "Method and Device for Confirmation using Hologram", Apr. 1994.

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