| 摘要 |
<p>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 (Q1,Q3) for connecting the electrodes (5a,5b) of the piezoelectric element (5) to the power supply (2) and discharge switching elements (Q2,Q4) for connecting the electrodes (5a,5b) to ground, and a switch circuit (9) for inserting a limiting resistor (R2) in at least either one of a current path between the power supply (2) and the piezoelectric element (5) and a current path between the piezoelectric element (5) and ground.
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