| 摘要 |
PROBLEM TO BE SOLVED: To obviate a projected portion to be brought into contact with an object to be driven for reduction in size, by forming inside a driving block displacement mechanism portions ends on one side of which are fixed on the driving block and ends on the other side of which are free, and sticking a piezoelectric element to the displacement mechanism portion. SOLUTION: An alternating-current voltage from a signal generator 19 is input to a driver 20 and amplified, and further part or all of a plurality of electrodes 15a-15f are selectively energized. When the alternating-current voltage is applied to the electrodes 15a-15f, piezoelectric elements 14a-14f are repeatedly bent according to the applied voltage. Bending vibration is excited in displacement mechanism portions 13a-13f due to bending in the piezoelectric elements 14a-14f. Using the vibration as driving source a moving body 17 moves from the fixed ends to the free ends of the displacement mechanism portions 13a-13f, that is, from right to left. The moving body 17 is brought into contact with a driving block 11 under pressure by self weight, and an electrode 16 is grounded. However, even if the actuator is connected to a pole opposite to the voltage applied to the electrodes 15a-15f, the actuator can be operated. |
