Secure optical identification means and method with enhanced var

Details Secure optical identification means and method with enhanced var Secure optical identification means and method with enhanced var

1996-01-29

1998-08-11

Dzierzynski, Paul M.

Optical: systems and elements

Holographic system or element

Authentication

359572, 235457, G03H 100, G02B 518, G06K 710

Patent

active

057935025

ABSTRACT:
In a preferred embodiment, secure optical identification, including: a first lacquer layer; a metallic layer disposed on a first surface of the first lacquer layer, with a first surface of the metallic layer in contact with the first surface of the first lacquer layer; a diffraction pattern embossed in the first surface of the first lacquer layer through the metallic layer; a pattern formed in the metallic layer by demetallizing areas of the metallic layer; and a second lacquer layer, having the same refractive index as that of the first lacquer layer, disposed on a second surface of the metallic layer so as to fill in voids adjacent the diffraction pattern caused by the demetallizing areas of the metallic layer.

REFERENCES:
patent: 5083850 (1992-01-01), Mallik et al.
patent: 5085514 (1992-02-01), Mallik et al.
patent: 5513019 (1996-04-01), Cueli

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