Optical: systems and elements – Holographic system or element – Authentication
Patent
1998-06-30
1999-12-07
Spyrou, Cassandra
Optical: systems and elements
Holographic system or element
Authentication
283 72, 283 86, 283 93, G03H 100
Patent
active
059992808
ABSTRACT:
A holographic anti-imitation method and device is provided, which can prevent a creative graphic design from unauthorized reproduction. The holographic anti-imitation method and device provides the creative graphic design as a hidden pattern in a synthesized image formed in a hologram that can be viewed only through a special viewing device. This allows the creative graphic design to be highly difficult to be reproduced by infringing parties. The synthesized image includes a background pattern visible to naked eyes and a hidden pattern merged into the background pattern which is invisible to the naked eyes. The hologram can be a dot-matrix hologram which is formed through laser means that generates two interfering laser beams to form a dot-matrix pattern of the synthesized image in the hologram. The hidden pattern can be viewed only through a special viewing device, such as a lenticular or a grate-like piece. When the viewing device is moved in crosswise or lengthwise direction over the hologram, the hidden pattern can be visualized to the viewer.
REFERENCES:
patent: 4668597 (1987-05-01), Merchant
patent: 5712731 (1998-01-01), Drinkwater et al.
Industrial Technology Research Institute
Schuberg Darren E.
Spyrou Cassandra
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