Gray scale generating circuit for thermal printer

Details Gray scale generating circuit for thermal printer Gray scale generating circuit for thermal printer

1989-12-15

1991-04-16

Evans, Arthur G.

Boots, shoes, and leggings

346 76PH, 346154, G06K 1500

Patent

active

050088378

ABSTRACT:
A signal generating circuit for generating gray scale signals for a thermal printer with a thermal head comprising a plurality of heating elements arrayed in a line, in such a manner that, even when white-level image data of a minimum or zero density is outputted, printing data adequate for slightly coloring a thermosensitive paper are obtained to prevent the occurrence of deterioration in the vicinity of the white label. The signal generating circuit includes a memory for storing image data to be printed, a PWM pulse driver for generating PWM driving pulses of the image data stored in the memory means, a zero-level pulse driver for generating a zero-level driving pulse, and a circuit for supplying the PWM driving pulses and the zero-level driving pulse to a thermal head drive circuit.

REFERENCES:
patent: 4399749 (1983-08-01), Arai
patent: 4536771 (1985-08-01), Tanaka

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