Thermal printer contrast control

Details Thermal printer contrast control Thermal printer contrast control

1984-03-02

1985-09-17

Envall, Jr., Roy N.

Electric heating

Heating devices

Combined with diverse-type art device

346 76PH, 219497, H05B 102, B41J 320, G01D 1510

Patent

active

045422818

ABSTRACT:
A method and apparatus for controlling the voltage and hence the power delivered to a thermal print head heater. The voltage and hence the power delivered to a thermal print head heater is controlled in response to the ambient temperature surrounding the thermal print head so as to produce printed characters with uniform contrast between the character and the paper surrounding the character independent of the ambient temperature surrounding the print head.

REFERENCES:
patent: 2732477 (1956-01-01), Runaldue
patent: 3308271 (1967-03-01), Hilbiber
patent: 3564204 (1971-02-01), Mense
patent: 3999190 (1976-12-01), Brown
patent: 4324486 (1982-04-01), Nishikawa
patent: 4370666 (1983-01-01), Noda
patent: 4409600 (1983-10-01), Minowa

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