Holographic method and materials to detect and prevent forgery i

Details Holographic method and materials to detect and prevent forgery i Holographic method and materials to detect and prevent forgery i

1994-09-01

1998-11-10

Henry, Jon W.

Optical: systems and elements

Holographic system or element

Authentication

283 86, 359 3, G03H 100

Patent

active

058352457

ABSTRACT:
Security and identity cards including at least one hologram of the card, or part of the card, are disclosed. Holographic methods and materials to detect and prevent forgery in identity cards such as credit cards and access cards to security areas are disclosed. This invention employs microholograms that are recorded in very small areas on the card and that are not readily visible to the bearer. Special recording materials for high efficiency holograms are used to allow the confinement of the recording in an about 10 to about 100 micron size area. Apparatus for the recording and reading of the holograms are also disclosed.

REFERENCES:
patent: 4171864 (1979-10-01), Jung et al.
patent: 4269473 (1981-05-01), Flothmann et al.
patent: 5379131 (1995-01-01), Yamazaki
patent: 5492370 (1996-02-01), Chatwin et al.

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