Authenticity identifying system for information storage cards

Details Authenticity identifying system for information storage cards Authenticity identifying system for information storage cards

1991-11-06

1994-03-01

Westin, Edward P.

Registers

Coded record sensors

Particular sensor structure

235457, 250566, G06K 710, G06K 1900

Patent

active

052910067

ABSTRACT:
To prevent unauthorized duplication of an information storage cards such as magnetic cards, IC cards, and optical cards, the card carries an identification region which may be identified by a simple optical sensor. The identification region may consist of holograph, diffraction grating, a multiplicity of parallel grooves and other processed surfaces having certain reflective or transmissive directivities. In particular, the identification region comprises a plurality of segments having two or more different reflective or transmissive directivities, and these segments are uniformly distributed in the identification region so that all of the segments may be accessed simultaneously by the optical sensor which comprises a light emitter and a light receiver including a plurality of parts each capable of individually detecting light reflected by or transmitted through the identification region.

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patent: 5101184 (1992-03-01), Antes

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