| 摘要 |
A drive device includes a stator; a rotatably provided drive member; a piezoelectric element, which is nipped between the stator and the drive member in a tangential line direction of a rotation locus circle of the drive member, and expands and contracts in the tangential line direction at an expansion speed at the time of the expansion and a contraction speed at the time of the contraction, respectively, the expansion speed and the contraction speed different from each other; and a rotor provided concentrically with the drive member to touch the drive member with a pressure.
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