| 摘要 |
It is provided a drive unit 1 in which the displacement amount of the frictional engagement member 7 can be reduced without lowering the driving torque, having a drive circuit 4 comprised of a bridge circuit which includes charge switching elements Q 1 , Q 3 for connecting the electrodes 5 a , 5 b of the piezoelectric element 5 to the power supply 2 and discharge switching elements Q 2, Q 4 for connecting the electrodes 5 a, 5 b to ground, and a switch circuit 9 for inserting a limiting resistor R 2 in at least either one of an current path between the power supply 2 and the piezoelectric element 5 and an current path between the piezoelectric element 5 and the ground.
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