Multiple image encoding using surface relief structures as authenticating device for sheet-material authenticated item
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United States of America Patent
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Nov 29, 1983
Grant Date -
N/A
app pub date -
Feb 19, 1981
filing date -
Feb 19, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An authenticating device comprises a transparent material, such as a plastic, having a thickness no greater than 100 micrometers embossed on one side with a lenticular array of lenslets having focal lengths substantially equal to this thickness, and embossed on the other side with a reflective relief pattern forming a periodic structure periods smaller than 100 micrometers, which periods are of a width that at least approximates that of the lenslets. The reflective relief structure of the authenticating device is secured to a viewable surface of the authenticated item sheet material and each period of the relief structure is comprised of a set of juxtaposed elements having significantly different reflective characteristics from one another.
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