Printing head drive circuit for thermal printer

Details Printing head drive circuit for thermal printer Printing head drive circuit for thermal printer

1981-09-25

1983-09-13

Miller, Jr., George H.

Recorders

Thermal recording

219216, G01D 1510, H05B 300

Patent

active

044045670

ABSTRACT:
A drive circuit for a recording head of a thermogenetic recording apparatus comprises a series connection of a current limiting resistor and a variable resistor. The series connection is connected with a control input terminal of switching circuits adapted to selectively energize a plurality of groups of heat generating elements. A stabilizing power source circuit is connected with the current limiting resistor to maintain the voltage across the current limiting resistor or a current flowing therethrough constant. The current flowing through the series connection is thus kept constant so that a voltage for energizing the heat generating element groups is determined by a resistance of the variable resistor. The element group energizing voltage is controllable by adjusting the resistance of the variable resistor.

REFERENCES:
patent: 3874493 (1975-04-01), Boyd
patent: 4113391 (1978-09-01), Minowa
patent: 4168421 (1979-09-01), Ito

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