Stacked-type piezoelectric actuator

摘要

A stacked-type piezoelectric actuator comprises a rectangular stack body having a plurality of piezoelectric ceramic layers and a plurality of internal electrode layers stacked alternately in a stacking direction. Alternate ones of the internal electrode layers disposed in the stacking direction are only exposed in two outer side surfaces of the stack body, while the other alternate ones of the internal electrode layers are only exposed in the other two outer side surfaces of the stack body. Two external electrodes are formed on opposite ones of the four outer side surfaces of the stack body. Thus, the alternate ones of the internal electrode layers are connected to one of the external electrodes but electrically insulated from the other one of the external electrodes. While the other ones of the internal electrode layers are insulated of the one of the external electrodes and are connected to the other one of the external electrodes.