Thermal printing head and method of making same

Details Thermal printing head and method of making same Thermal printing head and method of making same

1978-01-18

1980-03-18

Albritton, C. L.

Electric heating

Heating devices

Combined with diverse-type art device

29611, 29620, 219543, 338308, 338309, 346 76PH, 357 61, 357 63, H05B 100

Patent

active

041941080

ABSTRACT:
A thermal printing head for printing alphanumeric characters on a thermally-responsive medium, the head being faced with a pattern of heat generating "dot" elements electrically insulated from one another and having conductive leads, with means for connecting the leads selectively to a source of electric current. The heat generating elements are formed of a film of boron phosphide. Preferably the leads are also formed of boron phosphide, integral with the elements, but "doped" to secure a high degree of conductivity. The printing head is formed by applying a boron phosphide compound on a substrate, covering the same with a passivation film, removing the passivation film to expose a background area of the compound film defining a central "island" of unexposed area, doping the exposed background area to increase the conductivity thereof, removing the passivation film from the island, and forming grooves in the compound film dividing the island into separate heat generating elements, with the grooves extended into the background area to form pairs of integral conductive leads for the elements.

REFERENCES:
patent: 3161457 (1964-12-01), Schroeder et al.
patent: 3210624 (1965-10-01), Williams
patent: 3478191 (1969-11-01), Johnson et al.
patent: 3578946 (1971-05-01), Colello
patent: 3813513 (1974-05-01), Vora et al.
patent: 3814897 (1974-06-01), Otani et al.
patent: 3877060 (1975-04-01), Shono et al.

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