Ultrasonic motor and lens apparatus including the same

摘要

Provided is an ultrasonic motor, comprising: a vibrator including a piezoelectric element and a contact surface to be brought into contact with a member to be driven, the vibrator driving the member to be driven by an ultrasonic vibration excited by the piezoelectric element; a holding part configured to hold the vibrator; a pressurization unit configured to apply a bias force for biasing the holding part toward the member to be driven so as to impress the contact surface against the member to be driven; and a fixing unit configured to support the pressurization unit, in which the holding part holds the vibrator on both sides of the contact surface in a driving direction of the member to be driven.

主权项

1. A motor, comprising:
a vibrator including a piezoelectric element, the vibrator being driven by a vibration excited by the piezoelectric element; a holding part configured to hold the vibrator; and an elastic member configured to, via a pressing unit, apply a bias force for biasing the vibrator toward a member so as to press the vibrator against the member, the vibrator including:
a plate part including a projection part to be brought into contact with the member by the bias force, wherein the piezoelectric element is mounted on the plate part;a junction part that joins the vibrator to the holding part; anda bridge part configured to bridge the junction part and the plate part, wherein the bridge part is narrower in width than the plate part so as to reduce transmission of the vibration from the plate part to the junction part.