Ultrasonic motor

Abstract

Provided is an ultrasonic motor wherein it is difficult for positional deviation to occur between a spring member and a shaft member.　An ultrasonic motor 1 comprises: a stator 2 having a plate-shaped vibrating body 3 that includes first and second principal surfaces 3a, 3b which face each other, and a piezoelectric element; a rotor 4 that directly or indirectly makes contact with the second principal surface 3b of the vibrating body 3; a spring member 6 that imparts elastic force to the rotor 4 in a direction toward the stator 2 side from the rotor 4 side, and that has an opening 6c; and a shaft member 7 that is inserted into the opening 6c of the spring member 6 and that has a fitting part 7a. The shape of the opening 6c of the spring member 6 is a noncircular shape in a planar view. The spring member 6 has a projecting part 6d that is bent in a direction toward the rotor 4 side from the stator 2 side. An opening edge part of the opening part 6c, which is a tip part 6e of the projecting part 6d, and the fitting part 7a of the shaft member 7, fit together.

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