OPTICAL SECURITY DEVICE WITH NANOPARTICLE INK
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United States of America Patent
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Issued Date -
Oct 30, 2014
app pub date -
Dec 13, 2012
filing date -
Dec 22, 2011
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Abstract
An optical security device, including a substrate (102) having a first surface and a second surface; and a metallic nanoparticle ink (104) provided intermittently in at least one area on the first surface (102) to produce a reflective or partially reflective patch or patches; wherein a high refractive index coating (106) is applied over the area or areas (108) in which the metallic nanoparticle ink is provided, the high refractive index coating (106) adhering to the first surface (102) where the metallic nanoparticle ink is not present, thereby retaining the metallic nanoparticle ink (104) between the first surface (102) and the high refractive index coating (106).
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