| 摘要 |
PROBLEM TO BE SOLVED: To obtain a piezoelectric actuator in which a drive frequency can be changed by a simple means with respect to changes in a resonance frequency. SOLUTION: This piezoelectric actuator is provided with a plurality of displacement mechanism parts 103, 104 which comprise respective free end parts, in which a piezoelectric element 105 and a piezoelectric element 106 are pasted and installed on faces on one side and in which a moving body 102 comes into contact with faces on the other side. In addition, it is provided with a plurality of changeover circuits 110, 111 with which a drive circuit 118 and a sensing circuit 119 are connected selectively to the piezoelectric elements 105, 106. The control voltage of an oscillation circuit is controlled through a control circuit 120 by a voltage which is detected by the sensing circuit 119. |
