| 摘要 |
A vibrational actuator excellent efficiency, in which obstructions of the vibration due to support of the elastic member are cancelled as far as possible. The vibration actuator includes an annular elastic body, at least one piezoelectric element provided on one plane of the elastic body, a relative movement member in pressure contact with the elastic body on a second plane thereof, and support members which support the elastic member disposed on the second plane. In the elastic member, a first vibration mode acting as a drive source, and a second vibration mode which is a bending vibration providing a clutch mechanism are generated. The support members are arranged in a nodal circle and a nodal diameter of the second vibration mode generated in the elastic body.
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