Vibration wave actuator

Patent metadata

Field	Value
Publication number	US-9564837-B2
Application number	US-201414151012-A
Country	US
Kind code	B2
Filing date	Jan 9, 2014
Priority date	May 11, 2010
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

A vibration wave actuator includes a vibrator, a driven element, and a magnet. The vibrator has at least an electro-mechanical energy conversion element and an elastic body to which the electro-mechanical energy conversion element is joined, the elastic body including a contact portion. The driven element is in pressure contact with the contact portion of the vibrator, and includes a magnetic substance. The magnet is arranged such that the vibrator is placed between the driven element and the magnet.

First claim

What is claimed is:

1. A vibration wave actuator comprising:
a vibrator including at least an electro-mechanical energy conversion element and an elastic body to which the electro-mechanical energy conversion element is joined, the elastic body including a contact portion;
a driven element that is in pressure contact with the contact portion of the vibrator, the driven element including a magnetic substance; and
a magnet,
wherein the magnet, the vibrator and the driven element are arranged consecutively in the order as listed, and
wherein the elastic body comprises a paramagnetic substance metal material.

2. The vibration wave actuator according to claim 1 , wherein the contact portion in the vibrator includes a magnetic substance.

3. The vibration wave actuator according to claim 1 ,
wherein an elliptic motion is generated in the contact portion, and
wherein a relative position of the vibrator and the driven element is changed by the elliptic motion.

4. The vibration wave actuator according to claim 1 , wherein the magnetic substance is a ferromagnetic substance.

5. The vibration wave actuator according to claim 1 , wherein the magnetic substance is an iron-based metal.

6. The vibration wave actuator according to claim 1 , wherein two out-of-plane bending modes are excited in the vibrator by the electro-mechanical energy conversion element being applied with an alternating voltage.

7. The vibration wave actuator according to claim 1 , wherein the elastic body comprises aluminum.

8. The vibration wave actuator according to claim 1 , comprising a plurality of vibrators,
wherein the plurality of the vibrators are arranged at positions where directions of forces generated by elliptic motion of the contact portions are different, and moves the driven element that is in pressure contact with the vibrators via the contact portions of the vibrators in a predetermined movement direction formed by combining the forces in the different directions.

Assignees

• Canon Kk

Inventors

• Oda Yuki
• Kojima Nobuyuki

Classifications

• H04N23/685

  performed by mechanical compensation · CPC title

• H04N23/682

  Vibration or motion blur correction · CPC title

• H04N5/2328

  Electricity · mapped topic

• G02B27/646

  compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68) · CPC title

• H02N2/0055

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