| 摘要 |
PROBLEM TO BE SOLVED: To provide a driving gear capable of super-accurate positioning control of a movable member. SOLUTION: This driving gear 30 is provided with a piezoelectric element 2 expanding and contracting when applied with a voltage, a support member 16 fixed to one end in the expanding and contracting direction of the piezoelectric element 2, a drive shaft 18 fixed to the other end in the expanding and contracting direction of the piezoelectric element 2, the movable member 20 engaged with the drive shaft 18 by friction force and driven along the drive shaft 18 vibrating by the expanding and contracting piezoelectric element 2, and a drive circuit 3 applying a voltage to the piezoelectric element 2. The drive circuit 3 varies the wave form of the voltage applied to the piezoelectric element 2 such that the movable member 20 switches between a high speed drive and a low speed drive. COPYRIGHT: (C)2006,JPO&NCIPI
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