Thermally readable encoding and activation thereof

Details Thermally readable encoding and activation thereof Thermally readable encoding and activation thereof

1987-06-01

1989-12-19

Pellinen, A. D.

Registers

Records

235439, 235491, 365148, G06K 1900

Patent

active

048884758

ABSTRACT:
A thermally readable encoding arrangement can be scanned with a temperature radiation sensor. The encoding arrangement has alternating regions which differ in thermal conductivity, capacity or emissivity characteristics. Heat is either supplied or withdrawn from the encoded region after which the region is sequentially scanned along a path using a radiation detector to evaluate the temperature differences which arise because of the characteristics. Various forms of temperature activation and encoding structures are disclosed.

REFERENCES:
patent: 3511973 (1970-07-01), Best
patent: 3573438 (1971-04-01), Rowen
patent: 3959630 (1976-05-01), Hogberg
patent: 4176406 (1979-11-01), Matkam
patent: 4724309 (1988-02-01), Greene

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