PIEZOELECTRIC ACTUATOR UNIT AND METHOD FOR TESTING PIEZOELECTRIC ACTUATOR UNIT

摘要

A piezoelectric actuator unit includes: a wiring board; a piezoelectric actuator which is provided with a piezoelectric layer, a plurality of individual electrodes provided to the piezoelectric layer, a common electrode which faces the plurality of individual electrodes sandwiching the piezoelectric layer between the common electrode and individual electrodes, and which is divided into a plurality of split electrodes, a plurality of individual contact points which are in conduction with the individual electrodes, and which are to be connected to the wiring board, and a plurality of reinforcing contact points which are connected to the wiring board to reinforce a connection with the wiring board; and a conduction mechanism which brings the plurality of split electrodes into conduction. Each of the split electrodes is in conduction with at least one of the reinforcing contact points.