Optically-readable cards

Details Optically-readable cards Optically-readable cards

G - Physics

09

F

40/18, 42/2, 235

G09F 3/00 (2006.01) G06K 1/12 (2006.01) G06K 19/14 (2006.01) G07D 7/14 (2006.01) G07F 7/02 (2006.01) G07F 7/08 (2006.01) G09C 5/00 (2006.01)

Patent

CA 1200385

OPTICALLY-READABLE CARDS ABSTRACT OF THE DISCLOSURE An optically-readable value card for use in a vending system for vending goods or services includes a plurality of heat-sensitive optically-readable value elements each of which, upon heating to a first temperature above ambient, changes its color in a reversible manner, but upon heating to a second temperature above ambient and higher than the first temperature, changes to a second color in an irrevers- ible manner. Each of the value elements is in the form of a light window having a layer of a thermochromic material which changes its color in a reversible manner when heated to the first temperature, and a layer of a thermographic material which changes its color in an irreversible manner when heated to the second temperature.

432917

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