Thermal head drive unit

Details Thermal head drive unit Thermal head drive unit

1992-06-15

1994-09-20

Fuller, Benjamin R.

Recorders

Thermal recording

B41J 236

Patent

active

053493737

ABSTRACT:
A thermal head drive unit comprises electric power supply means for supplying electric power to heat-generating resistor elements arranged in a line in a thermal head. Head drive means is provided for electrically driving the heat-generating resistor elements in a lump by supplying electric power continuously variably in time to the heat-generating resistor elements depending on input gradation data. Head drive control means controls the head drive means in such a manner that, in a one-line recording time period composed of a power supply time during which electric power is supplied to the heat-generating resistor elements and an intermission time during which no electric power is supplied to the heat-generating resistor elements in disregard of the gradation data, the intermission time occupies a part not more than approximately 40% in the one-line recording time period.

REFERENCES:
patent: 4704617 (1987-11-01), Sato et al.

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