PIEZOELECTRIC ACTUATOR AND FLUID INJECTION HEAD HAVING THE SAME

摘要

A first common electrode fixed to a predetermined potential is formed on a vibration plate. A first piezoelectric layer having a first thickness is arranged on the first common electrode. A drive electrode supplied with a drive signal from outside is arranged on the first piezoelectric layer. A second piezoelectric layer having a second thickness greater than the first thickness is arranged on the drive electrode. A second common electrode fixed to the predetermined potential is arranged on the second piezoelectric layer.