Thermal printing head

Details Thermal printing head Thermal printing head

1981-06-17

1983-11-01

Mayewsky, Volodymyr Y.

Electric heating

Heating devices

Combined with diverse-type art device

219505, 219543, 338 22R, 101 1, H05B 100

Patent

active

044131704

ABSTRACT:
An electrical heating resistor of the type deposited on a substrate plate constituting the basis element of a thermal printing head. In order to concentrate the heat given off in the free surface of said heating resistor towards the paper to print, the invention provides for the deposition on the substrate of at least one layer having a relatively constant resistivity and then at least one surface layer with a non-linear resistivity and a negative temperature coefficient. Starting from a high value when cold, the resistance of the surface layer drops abruptly as soon as it reaches the triggering temperature, thus switching the heat resistor by command of a control circuit.

REFERENCES:
patent: 2915724 (1959-12-01), Fritts
patent: 3973106 (1976-08-01), Ura
patent: 4206541 (1980-06-01), Marciniec
patent: 4246468 (1981-01-01), Horsma
Kitamura, IBM, Technical Disclosure Bulletin, "Thermal Printer Head Free From Overheating", vol. 16, No. 8, Jan. 1974.

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