Multiple image encoding using surface relief structures as authe

Details Multiple image encoding using surface relief structures as authe Multiple image encoding using surface relief structures as authe

1981-02-19

1983-11-29

Arnold, Bruce Y.

Printed matter

Maps

283 91, 428916, G02B 518, G09F 303

Patent

active

044177844

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.

REFERENCES:
patent: 4124947 (1978-11-01), Kuhl et al.
patent: 4186943 (1980-02-01), Lee

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