Patent ID: 7681971

Claim:
A drop emitting device comprising: a drop generator having an electromechanical transducer; and a controller to supply a drive signal to the electromechanical transducer including: a first fire interval, and a second fire interval applied to the drop generator, the first and second fire intervals being separate, contiguously adjacent, non-overlapping and in sequence starting with the first fire interval, and each of the first and second fire intervals having a duration T; the first fire interval having a drop firing bi-polar waveform of first and second pulses of first and second polarities and a third pulse having a first polarity, and the second fire interval including one non-firing unipolar pulse that is the only non-firing pulse in the second fire interval; and wherein the second fire interval, which includes one and only one non-firing unipolar pulse, does not cause a drop to be fired.