Vibration wave motor

Patent metadata

Field	Value
Publication number	US-2016352256-A1
Application number	US-201615158900-A
Country	US
Kind code	A1
Filing date	May 19, 2016
Priority date	May 28, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

A vibration wave motor includes: a vibrator including a vibration plate and a piezoelectric element; a friction member frictionally contacting the vibrator; a pressing member generating a pressing force to bring the vibrator in frictional contact with the friction member; and a pressing force transmitting member between the vibrator and the pressing member to transmit the pressing force to the vibrator. The vibrator and the friction member move in a relative movement direction by an elliptical vibration, and the pressing force transmitting member includes: an engagement portion formed near a contact portion with the pressing member and engaged with the pressing member; first restricting portion restricting movement in the relative movement direction; and a second restricting portion. restricting movement in a direction perpendicular to a pressing direction by the pressing member and the direction. The pressing force transmitting member is rotatably held with respect to the pressing member.

First claim

What is claimed is:

1 . A vibration wave motor comprising:
a vibrator including a vibration plate and a piezoelectric element; a friction member in frictional contact with the vibrator; a pressing member that generates a pressing force to bring the vibrator in frictional contact with the friction member; and pressing force transmitting member positioned between the vibrator and the pressing member to transmit the pressing force from the pressing member to the vibrator, wherein the vibrator and the friction member move relatively in a relative movement direction by an elliptical vibration generated at the vibrator, and wherein the pressing force transmitting member includes:
an engagement portion that is formed near a contact portion with the pressing member and with which the pressing member is engaged;
a first restricting portion that restricts movement in the relative movement direction; and
a second restricting portion that restricts movement in a direction perpendicular to a pressing direction by the pressing member and the relative movement direction,
wherein the pressing force transmitting member is rotatably held with respect to the pressing member.

2 . A vibration wave motor according to claim 1 , wherein the vibrator includes a wiring board electrically connected with the piezoelectric element, and
wherein the first restricting portion of the pressing force transmitting member is provided on a side opposed to an extraction portion of the wiring board.

3 . A vibration wave motor according to claim 1 , wherein the engagement portion of the pressing force transmitting member is provided on the pressing force transmitting member corresponding to a center of the vibrator viewed from the pressing direction.

4 . A vibration wave motor according to claim 1 , further comprising a movable member connected with an object to be driven,
wherein the movable member holds the vibrator, the pressing force transmitting member and the pressing member, and the second restricting portion is engaged with a hole portion formed at the movable member.

5 . A vibration wave motor according to claim 1 , further comprising a vibrator holding member that holds the vibrator, wherein the first restricting portion fits in a recessed portion formed on a side wail of the vibrator holding member.

6 . A vibration wave motor according to claim 1 , wherein the oscillator wave motor is an ultrasonic wave motor that causes the vibration plate to generate ultrasonic vibration.

Assignees

• Canon Kk

Inventors

• Yamasaki Ryo

Classifications

• H02N2/026

  by pressing one or more vibrators against the driven body · CPC title

• H02N2/0055 Primary

  Supports for driving or driven bodies; Means for pressing driving body against driven body · CPC title