Friction member to contact opposite member, method for manufacturing friction member, vibration-type actuator, and electronic device

Patent metadata

Field	Value
Publication number	US-10530277-B2
Application number	US-201715612095-A
Country	US
Kind code	B2
Filing date	Jun 2, 2017
Priority date	Jun 10, 2016
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

A vibration-type actuator capable of suppressing reduction in holding torque or holding force under influence of humidity. A vibration-type actuator 10 includes a vibrating body 2 and a driven body 1. The vibrating body 2 has a piezoelectric element 2c and an elastic body 2b. The driven body 1 is in contact with the vibrating body 2. The vibration-type actuator 10 moves the vibrating body 2 and the driven body 1 relatively to each other by vibration excited to the vibrating body 2. At least one of a first contact portion of the vibrating body 2 and a second contact portion of the driven body 1 includes a stainless-steel sintered body with pores and at least some of the pores are impregnated with a resin.

First claim

What is claimed is:

1. A vibration-type actuator, comprising:
a vibrating body comprising an electric-mechanical energy conversion element and an elastic body; and
a contact body configured to be in contact with the vibrating body,
wherein the vibration-type actuator moves the vibrating body and the contact body relatively to each other by vibration excited to the vibrating body, and
wherein at least one of a first contact portion of the vibrating body to be in contact with the contact body and a second contact portion of the contact body to be in contact with the vibrating body includes a stainless-steel sintered body with pores and at least some of the pores are impregnated with a resin.

2. The vibration-type actuator according to claim 1 , wherein the contact body is made from the stainless-steel sintered body.

3. The vibration-type actuator according to claim 2 , wherein the contact body comprises a main body portion and the second contact portion which is provided on the main body portion and to be in contact with the vibrating body, and the stainless-steel sintered body of the second contact portion is directly bonded to the main body portion.

4. The vibration-type actuator according to claim 3 , wherein a concave is formed in the main body portion and the stainless-steel sintered body is embedded in the concave.

5. The vibration-type actuator according to claim 1 , wherein the first contact portion is provided on the elastic body and the stainless-steel sintered body of the first contact portion is directly bonded to the elastic body.

6. The vibration-type actuator according to claim 5 , wherein a concave is formed in the elastic body and the stainless-steel sintered body is embedded in the concave.

7. The vibration-type actuator according to claim 1 , wherein the resin contains ceramic powder.

8. The vibration-type actuator according to claim 1 , wherein the stainless-steel sintered body is made from a martensitic stainless steel and has a Vickers hardness of 600 HV or more.

9. The vibration-type actuator according to claim 1 , wherein the stainless-steel sintered body is made from an austenitic stainless steel and has a nitride phase on a surface.

10. An electronic device, comprising:
the vibration-type actuator according to claim 1 ; and
a member configured to be positioned by driving of the vibration-type actuator.

Assignees

• Canon Kk

Inventors

• Morita Hiromitsu
• Tamai Jun
• Araki Yasuyuki

Classifications

• H02N2/163

  Motors with ring stator · CPC title

• H02N2/026

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

• F16F7/04

  in the direction of the axis of rotation {(F16F7/023 takes precedence)} · CPC title

• H02N2/103

  by pressing one or more vibrators against the rotor · CPC title

• H02N2/001 Primary

  Driving devices, e.g. vibrators · CPC title