Thermal head apparatus with integrated circuits and current dete

Details Thermal head apparatus with integrated circuits and current dete Thermal head apparatus with integrated circuits and current dete

1994-11-29

1997-06-24

Reinhart, Mark J.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Having driving circuitry for recording means

B41J 235, G01D 1510

Patent

active

056421486

ABSTRACT:
A thermal head apparatus includes a heat generation driving integrated circuit and a current detecting integrated circuit. The heat generation driving integrated circuit is constituted by a plurality of first switching elements respectively connected in series with current detecting resistors, a first shift register for serially inputting print input data for heating heat generation elements, a first latch circuit for latching the print input data input to the first shift register at a predetermined timing, and a first output gate circuit for selectively controlling energization of the first switching elements on the basis of the print input data latched by the first latch circuit. The current detecting integrated circuit is constituted by a plurality of second switching elements respectively connected to connection points between the heat generation elements and the current detecting resistors, a second shift register, a second latch circuit, and a second output gate circuit for selectively controlling energization of the second switching elements on the basis of the data latched by the second latch circuit, the current detecting integrated circuit outputting, as serial data, current detection data which energizes the second switching elements.

REFERENCES:
patent: 4500893 (1985-02-01), Sakura et al.
patent: 4689694 (1987-08-01), Yoshida
patent: 5132709 (1992-07-01), West
patent: 5422662 (1995-06-01), Fukushima et al.
Patent Abstracts of Japan, vol. 15, No. 77, JP-A-02-299865.
Patent Abstracts of Japan, vol. 16, No. 157, JP-A-04 008562.
Patent Abstracts of Japan, vol. 18, No. 422, JP-A-06 127005.
Patent Abstracts of Japan, vol. 18, No. 554, JP-A-06 198943.

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