Charge leakage prevention and voltage drift prevention on a droplet ejection device for an inkjet printer. In one method to prevent charge leakage on a droplet ejection device with a switch and a piezoelectric actuator, the method includes controlling the switch to drive the piezoelectric actuator with...http://www.google.de/patents/US7556327?utm_source=gb-gplus-sharePatent US7556327 - Charge leakage prevention for inkjet printing
