POLYMER BANK NOTE WITH OPTICAL SECURITY ASSEMBLY PROVIDING IN-SUBSTRATE FOCUSING
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United States of America Patent
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Issued Date -
May 14, 2015
app pub date -
Oct 31, 2014
filing date -
Nov 8, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An assembly adapted for use as a polymer bank note with optical-based security features. The apparatus includes a planar substrate formed of a thin layer or sheet of transparent polymer such as a polypropylene. The apparatus includes an image stack (e.g., multiple layers of ink and other materials) applied to a first side of the planar substrate. An optical security assembly is provided that includes an array of lenses on the first side of the planar substrate that extends on the first side adjacent to the image stack. The optical security assembly includes an image element, such as interlaced images, on a second side of the planar substrate opposite the lens array. The lenses are each configured to have a focal length corresponding to the thickness of the planar substrate and to focus at the second side upon a portion of the image element to provide “in-substrate focusing.”
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