Secure optical identification means and method with enhanced variability
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United States of America Patent
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Aug 11, 1998
Issued Date -
N/A
app pub date -
Jan 29, 1996
filing date -
Aug 31, 1993
priority date (Note) -
Expired
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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.
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