Method and apparatus for coding heat sensitive media

Details Method and apparatus for coding heat sensitive media Method and apparatus for coding heat sensitive media

1988-08-01

1990-09-18

Trafton, David L.

Registers

Coded record sensors

Particular sensor structure

235487, 235488, 346 76R, 350353, 430336, G06K 710

Patent

active

049580655

ABSTRACT:
A method of coding an optically-readable medium comprises: applying to the medium at least one coating of a heat-sensitive material to produce a specified combination of at least two optical changes as a function of time when heated to a predetermined temperature above ambient; heating the medium to the predetermined temperature; and sensing the optical changes undergone by the medium to determine whether the sensed changes match the specified combination. The method and apparatus are described particularly to an optically-readable medium wherein the heat-sensitive coating is in a plurality of windows formed in the medium, each window signifying a value element.

REFERENCES:
patent: 3584934 (1971-06-01), French
patent: 3836754 (1974-09-01), Toye et al.
patent: 4246302 (1981-01-01), Benton et al.
patent: 4273362 (1981-06-01), Carrier et al.
patent: 4332872 (1982-06-01), Zingher
patent: 4505498 (1985-03-01), Weinberger

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