Thermal head driver circuit

Details Thermal head driver circuit Thermal head driver circuit

1987-07-17

1989-04-04

Hartary, Joseph W.

Recorders

Thermal recording

219216, 358298, G01D 1510, H04N 122

Patent

active

048190080

ABSTRACT:
A thermal head driver circuit is disclosed, which comprises a thermal head including a plurality of heat generation elements in an array, a shift register for storing image data including a plurality of bits for a plurality of heat generation elements, signal generation circuit for generating a print signal having a duration corresponding to image data for each of said heat generation elements held in said shift register, and driving circuit for energizing the heat generation elements of the thermal head according to the print signal. The shift register has parallel data input terminals, to which all of image data including a plurality of bits for each of said heat generation elements are fed at a time. Image data is supplied in a single transfer from an external device to the driver circuit. The signal generation circuit includes a counter for counting a clock signal, a plurality of comparators for comparing the count of the counter and image data of each heat generation element and providing an output signal when the count of the counter is greater than image data of each heat generation element, and a plurality of gates, to which the print signal and the output signals of the plurality of comparators are fed.

REFERENCES:
patent: 3710913 (1973-01-01), Brennan, Jr. et al.
patent: 3975707 (1976-08-01), Ito et al.
patent: 4475114 (1984-10-01), Koyama et al.
patent: 4536774 (1985-08-01), Inui et al.
patent: 4563691 (1986-01-01), Noguchi et al.
patent: 4563693 (1986-01-01), Masaki
patent: 4575732 (1986-03-01), Kitaoka
Proceedings of 2nd Non-Impact Printing Technology Symposium, No. 5-2, "Color Ink Transfer Recording Using MultiThermal Printing Head and Subrimation Dye"; T. Saito, et al.; Jul. 25, 1985.

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