Patent ID: 9399342
Filing Date: 2016-07-26
CPC Classification: B41J

Claim Text:
1. A method of operating a printhead to provide actuation pulses for driving actuating elements for ejecting droplets from an actuator and having steps of: providing a common drive waveform for coupling to the actuating elements via respective switching circuits, the common drive waveform having a pre-charge ramp followed by a steeper slope, setting a start voltage of a leading edge of an actuation pulse according to a trim input by opening a first of the switching circuits to decouple the common drive waveform from a first of the actuating elements at least part way along the pre-charge ramp, in order to maintain the start voltage across the actuating element, and coupling the first of the actuating elements to the common drive waveform after the pre-charge ramp, in order to enable the voltage across the first actuating element to follow the steeper slope of the common drive waveform to form the leading edge.