VIBRATION WAVE MOTOR AND DRIVING APPARATUS USING THE VIBRATION WAVE MOTOR

摘要

A vibration wave motor includes: a vibrating plate having a rectangular surface; a piezoelectric device bonded to the vibrating plate, and configured to vibrate at high frequency; and a projection provided to the vibrating plate or the piezoelectric device. In the vibration wave motor, a natural vibration mode, which has a resonant frequency equal to or adjacent to a resonant frequency of torsional vibration in a natural vibration mode under a state in which the vibrating plate, the piezoelectric device, and the projection are integrated, is a natural vibration mode of bending vibration in a direction parallel to or orthogonal to a torsion center axis of the torsional vibration in the natural vibration mode. The projection is provided at a position closer to an antinode than to a node, which are in the direction orthogonal to the torsion center axis of the torsional vibration in the natural vibration mode.

主权项

1. A vibration wave motor, comprising:
a vibrating plate having a rectangular surface; a piezoelectric device bonded onto the vibrating plate, and configured to vibrate at high frequency; and a projection provided to one of the vibrating plate and the piezoelectric device, wherein: a natural vibration mode, which has a resonant frequency equal to or adjacent to a resonant frequency of torsional vibration in a natural vibration mode under a state in which the vibrating plate, the piezoelectric device, and the projection are integrated, is a natural vibration mode of bending vibration in one of a direction parallel to and a direction orthogonal to a torsion center axis of the torsional vibration in the natural vibration mode; and the projection is provided at a position closer to an antinode than to a node, the node and the antinode being in the direction orthogonal to the torsion center axis of the torsional vibration in the natural vibration mode.