Compensating driver circuit for thermal print head

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

B - Operations, Transporting

41

M

314/41

B41M 5/26 (2006.01) B41J 2/365 (2006.01)

Patent

CA 1162228

ABSTRACT OF THE DISCLOSURE 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.

352830

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