Low cost diffraction images for high security application

Details Low cost diffraction images for high security application Low cost diffraction images for high security application

1996-05-06

1998-09-29

Henry, Jon W.

Optical: systems and elements

Holographic system or element

Authentication

359567, 359572, 359576, 283 86, 283 91, 283 94, G02B 518, G03H 104, B42D 1510

Patent

active

058152920

ABSTRACT:
A security device includes two plastic layers and a metal layer. The plastic layers may be embossed or surface cast with contrasting surface relief diffraction patterns. A second metal layer may be provided including a pattern of voids through which the first metal layer may be seen by a human observer.

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