Pulsed constant current source for continuous tone resistive rib

Details Pulsed constant current source for continuous tone resistive rib Pulsed constant current source for continuous tone resistive rib

1987-05-01

1989-01-24

Goldberg, E. A.

Recorders

Thermal recording

400120, G01D 1510

Patent

active

048003999

ABSTRACT:
A pulsed constant current circuit is disclosed for each electrode of a resistive ribbon thermal printer. The circuit is energized for a predetermined time and provides a constant current pulse through the electrode to the resistive ribbon to cause a predetermined amount of dye to transfer from the ribbon to thereby provide a continuous tone print.

REFERENCES:
patent: 4434356 (1984-02-01), Craig et al.
patent: 4558328 (1985-12-01), Takanashi et al.
patent: 4621271 (1986-11-01), Brownstein
IBM Technical Bulletin, vol. 22, No. 2, 07/79, "Constant Current Resistive Ribbon Print Head Array Drive Scheme."

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