Gradation thermal printhead and gradation heat transfer printing

Details Gradation thermal printhead and gradation heat transfer printing Gradation thermal printhead and gradation heat transfer printing

1986-09-04

1987-12-15

Eickholt, E. H.

Typewriting machines

Typing by other than type-face or type-die

Thermal

346 76PH, 219216, B41J 302, G01D 1510

Patent

active

047129301

ABSTRACT:
A gradation thermal printhead having a plurality of heat generating elements each having a heat generating body connected between a pair of electrodes, the electric resistance value of the heat generating body being locally increased in one or more portions thereof. Disclosed also is a gradation heat transfer printing apparatus making use of the gradation thermal printhead mentioned above and employing an energy controlling means for varying the voltage or pulse width of the signal pulse voltage applied to the thermal printhead, thereby allowing a control of the area of the printed dot corresponding to one heat generating element, i.e., the density of printing, thus attaining a gradation control of the printed image.

REFERENCES:
patent: 4300142 (1981-11-01), Kos
patent: 4446355 (1984-05-01), Sato et al.
patent: 4472723 (1984-09-01), Shibata
patent: 4510507 (1985-04-01), Ishikawa
patent: 4558331 (1985-12-01), Adkisson
"Thermal Printhead", IBM Tech. Discl. Bull., vol. 22, No. 6, Nov. 1979, pp. 2436-2437.
"Low Power, High Quality, High Speed Piezoelectric/Thermal Printhead", IBM Tech. Discl. Bull., vol. 21, No. 8, Jan. 1979, pp. 3062-3064.

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