Thermal printer drive circuit

Details Thermal printer drive circuit Thermal printer drive circuit

1981-12-28

1983-10-11

Griffin, Donald A.

Recorders

Thermal recording

219216, G01D 1510, B41J 320

Patent

active

044096003

ABSTRACT:
A drive circuit for a thermal printer having plural heat generating elements which are selectively energized comprising a current device controlling application of current to the heat generating means. The drive circuit also includes a current application time control circuit for varying the period of time during which current flows to the heat generating elements. Dot printing is produced with constant power and constant temperature over a wide range of power supply voltage variations. The time control circuit includes a charging circuit having a capacitor, and a discharging circuit connected in parallel. The charging circuit is inserted between the power supply terminals and includes a constant voltage component. A switching circuit operates in response to the level of charge on the capacitor to control the application of current to the heat generating means.

REFERENCES:
patent: 3577137 (1971-05-01), Brennan
patent: 3934695 (1976-01-01), Kovalick
patent: 4113391 (1978-09-01), Minowa
patent: 4262188 (1981-04-01), Beach
patent: 4268838 (1981-05-01), Nakano et al.

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