| 摘要 |
PROBLEM TO BE SOLVED: To provide a piezoelectric actuator capable of easily and reliably displacing a body to be driven when displacing the body to be driven by external force other than the piezoelectric actuator.SOLUTION: A piezoelectric actuator includes: a piezoelectric element provided with a plurality of electrodes; a diaphragm at least longitudinally vibrating by applying a signal to the piezoelectric element; and a body to be driven brought into contact with the diaphragm. The signal is applied to at least a first electrode and a second electrode out of the plurality of electrodes when causing the diaphragm to longitudinally vibrate. A third electrode is disposed between the first electrode and the second electrode in a direction different from a vibration direction of longitudinal vibration. |
