Thermal printer head driving circuit with thermal history based

Details Thermal printer head driving circuit with thermal history based Thermal printer head driving circuit with thermal history based

1993-01-15

1995-08-22

Tran, Huan H.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Density control

67 11, B41J 2365, B41J 236

Patent

active

054444640

ABSTRACT:
Disclosed herein is a thermal head driving circuit for energizing a plurality of thermal resistors corresponding to a plurality of dots to thereby control a thermal head for printing data on a heat-sensitive paper. The thermal head driving circuit is provided with a plurality of latch circuits each of which retains recorded information formed of respective dots on the present line, of the plurality of dots and previous recorded information and outputs a plurality of patterns indicative of these information on a time-series basis. A pulse signal generator outputs pulse signals so as to increase the number of pulses with respect to patterns each falling under a high level when patterns that the degrees of increases in temperatures of said thermal resistors by energization based on patterns falling under different levels, of the plurality of patterns, are the same, are selected. The thermal resistors are energized based on the outputted pulse signals.

REFERENCES:
patent: 3975707 (1976-08-01), Ito et al.
patent: 4305080 (1981-12-01), Cunningham et al.
patent: 5346318 (1994-09-01), Endo
patent: 5377159 (1994-12-01), Endo
Ser. No. 07/952,254 Ketty filed Sep. 28, 1992.
Ser. No. 07/856,757 Tran filed Mar. 24, 1992.

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