Patent ID: 9579890
Date: 2017-02-28
CPC Classifications: B41J

Claim:
1. A printhead having: actuating elements for ejecting fluid droplets, a drive circuit for receiving a common drive waveform, the drive circuit comprising a drive switch for selectively switching the common drive waveform onto the actuating element, to selectively apply the received common drive waveform to at least one of the actuating elements according to a print signal to cause the fluid droplets to be ejected, with resulting droplet ejection properties being dependent on at least a slew rate of a trailing edge of the common drive waveform and a slew rate of a leading edge of the common drive waveform, and having a variable resistance circuit to adjust slew rates of the common drive waveform, and a control circuit configured to control the variable resistance circuit according to a trim signal to adjust the slew rate of the leading edge of the common drive waveform, the droplet ejection properties being less sensitive to adjustment of the slew rate of the leading edge than to adjustment of the slew rate of the trailing edge.