| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic motor that exhibits stable performance by suppressing variations in the magnitude of two standing waves excited by a piezoelectric element.SOLUTION: The ultrasonic motor is provided with a piezoelectric element that includes a plurality of divided electrodes that are mounted on one surface and are equidistantly arranged in the circumferential direction, an inner peripheral electrode that is arranged on the inner peripheral side of the divided electrodes, an outer peripheral electrode that is arranged on the outer peripheral side of the divided electrodes, a plurality of inner peripheral short-circuiting electrodes that are mounted on the divided electrodes and on the inner peripheral electrode so as to short-circuit every other divided electrode out of the plurality of divided electrodes with the inner peripheral electrode in the radial direction of the piezoelectric element, and a plurality of outer peripheral short-circuiting electrodes that are mounted on the divided electrodes and on the outer peripheral electrode so as to short-circuit the divided electrodes not short-circuited with the inner peripheral electrode out of the plurality of divided electrodes with the outer peripheral electrode in the radial direction of the piezoelectric element. |
