Circuit for controlling thermal array recording head

Details Circuit for controlling thermal array recording head Circuit for controlling thermal array recording head

1987-09-11

1990-08-21

Reynolds, Bruce A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

346 76PH, 400120, 219216, G01D 1510, H04N 123, B41J 236

Patent

active

049511521

ABSTRACT:
A PWM (Pulse Width Modulation) control circuit for printing apparata comprises a memory for storing digitized image data, a main converter connected to the memory for converting upper bits of the digitzed image data into a main pulse-width modulated signal based on a first unit time duration, a sub-converter connected to the memory for converting the rest of the bits of the digitized image information into a sub pulse-width modulated signal based on a second unit time duration, and a drive circuit connected to the main converter and sub-converter for generating the driving signal in accordance with the main pulse-width modulated signal and sub pulse-width mnodulated signal. The amount of transferred digital tone data per horizontal line of a whole printing screen is reduced and the color concentration characteristics of the thermal head are appropriately maintained within an acceptable range.

REFERENCES:
patent: 3668560 (1972-06-01), Padalino
patent: 4310831 (1982-01-01), Henderson
patent: 4355319 (1982-10-01), Takeuchi
patent: 4443121 (1984-04-01), Arai
patent: 4492482 (1985-01-01), Eguchi
patent: 4777496 (1988-10-01), Maejima
patent: 4802105 (1989-01-01), Suzuki
patent: 4806950 (1989-02-01), Sekine
patent: 4819008 (1989-04-01), Nagato

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