| 摘要 |
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.
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