Patterned optical structures with enhanced security feature
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United States of America Patent
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Feb 1, 2011
Grant Date -
Jan 31, 2008
app pub date -
Oct 1, 2007
filing date -
Jul 8, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A security article is a substrate having a diffractive grating thereon, coated with a windowed high index layer and a color shifting coating visible through the window. The color shifting coating is disposed on the high index layer or on the opposite side of the substrate. Alternatively, a thin film color shifting structure conforming the diffractive grating is disposed between the grating and the windowed high index layer, also conforming to the shape of the diffractive grating. Alternatively, an ink with low density of color shifting pigments is applied over the high index layer conforming to the shape of the diffractive grating. The resulting color shifting image provides a reference to a holographic image.
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