In a method for driving an ink jet head in which at least a portion of a wall surface of an ink chamber is deformed by a piezoelectric actuator to eject ink, the voltage applied to the piezoelectric actuator is lowered from a voltage value in an initial condition, thereby causing the volume of the ink...http://www.google.de/patents/US6273538?utm_source=gb-gplus-sharePatent US6273538 - Method of driving ink-jet head
