Thermal head controller

Details Thermal head controller Thermal head controller

1994-03-15

1995-05-16

Tran, Huan

Incremental printing of symbolic information

Ink jet

Combined

400120, B41J 238, B41J 235

Patent

active

054165032

ABSTRACT:
An electric erosion can be prevented from occurring in a thermal head when a bias voltage is being applied to the thermal head on non-printing. When the bias voltage is being applied to heating resistance elements in the thermal head on non-printing, a motor drive circuit causes a motor to rotate a platen roller so that a heat-sensitive medium will be delicately moved to change the moisture on the surfaces of the heating resistance elements. Alternatively, preliminary pulses may be intermittently applied to a driver IC through a head drive circuit to energize the heating resistance elements sufficiently not to color the heat-sensitive medium so that the moisture on the surfaces of the heating resistance elements will be evaporated to avoid the electric erosion in the thermal head.

REFERENCES:
patent: 4568817 (1986-02-01), Leng et al.
patent: 4963884 (1990-10-01), Kiguchi et al.

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