Optical security component
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United States of America Patent
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Sep 13, 2005
Issued Date -
N/A
app pub date -
Oct 7, 2004
filing date -
Apr 8, 2002
priority date (Note) -
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Abstract
An optical security component for authenticating a document or a product including a transparent plastic film embossed to form an embossed surface and to have at least one diffraction grating; a layer of dielectric material of high optical index at least partially coated on the embossed surface and producing a colored effect of a first color for a first orientation of the component and a second different color for orientation perpendicular to the first orientation; a low optical index layer coated on a side opposite the viewing direction of the dielectric material; and a colored contrast layer having transparent zones and colored zones on the low optical index layer.
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