Vibration wave motor and driving apparatus using the vibration wave motor
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United States of America Patent
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Jan 1, 2019
Grant Date -
Apr 28, 2016
app pub date -
Oct 15, 2015
filing date -
Oct 27, 2014
priority date (Note) -
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Abstract
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 on 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.
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