Printhead drive circuit with variable resistance
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United States of America Patent
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Feb 28, 2017
Grant Date -
Mar 10, 2016
app pub date -
Sep 10, 2015
filing date -
Sep 10, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A printhead for a printer has actuating elements for ejecting fluid, and a drive circuit for selectively applying a drive waveform having several slopes, to an actuating element, according to a print signal. A resulting printhead has a lesser sensitivity to changes of slew rate in one slope of the drive waveform than a sensitivity to change in another. The drive circuit has a variable resistance circuit, and a control circuit to control the variable resistance circuit to adjust a slew rate of the slope of lesser sensitivity according to a trim signal. By making the adjustment less sensitive, the trim signal and trim control can have more relaxed tolerances, thus can employ simpler, cheaper circuitry.
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