Compensating driver circuit for thermal print head

Details Compensating driver circuit for thermal print head Compensating driver circuit for thermal print head

1979-07-18

1981-12-08

Miller, Jr., George H.

Recorders

Thermal recording

219216, G01D 1510, H05B 100

Patent

active

043050808

ABSTRACT:
A driver circuit for a thermal printing element varies the power applied to the element, depending upon its recent history of energization, in order to maintain uniform print density desprite temperature variation in the element. A capacitor charges and discharges to measure time intervals since the last element energization to control the voltage applied by an output transistor.

REFERENCES:
patent: 3577137 (1971-05-01), Brennan, Jr.
patent: 3725898 (1973-04-01), Canton
patent: 3777116 (1973-12-01), Brescia et al.
patent: 4032925 (1977-06-01), Kos
patent: 4070587 (1978-01-01), Hanakata
patent: 4113391 (1978-09-01), Minowa
patent: 4168421 (1979-09-01), Ito
patent: 4168421 (1979-09-01), Ito

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