Vibration actuator, and lens barrel and camera provided with same

Patent metadata

Field	Value
Publication number	US-9401666-B2
Application number	US-201113577461-A
Country	US
Kind code	B2
Filing date	Feb 8, 2011
Priority date	Feb 8, 2010
Publication date	Jul 26, 2016
Grant date	Jul 26, 2016

Abstract

A vibration actuator that is easy to manufacture and has good driving performance, and a lens-barrel and a camera provided with the same. The vibration actuator is provided with an oscillator that generates oscillations; and a relative movement member that is pressure contacts the oscillator, and moves relative to the oscillator due to the oscillation. Either a contact face of the oscillator with respect to the relative movement member or a contact face of the relative movement member with respect to the oscillator is a thermosetting resin film that is formed of polyamide-imide resin and fluororesin, and the other contact face is an anodic oxide film.

First claim

The invention claimed is:

1. A vibration actuator comprising:
an oscillator configured to generate oscillations, and
a movement member that is configured to move due to the oscillations of the oscillator, wherein
one of a contact face of the oscillator with respect to the movement member and a contact face of the movement member with respect to the oscillator is a thermosetting resin film and the other is an anodic oxide film,
the thermosetting resin film including a polyamide-imide resin, a fluororesin whose weight is smaller than that of the polyamide-imide resin, and a pigment whose weight is smaller than that of the polyamide-imide resin.

2. The vibration actuator according to claim 1 wherein
the thermosetting resin film has an indentation hardness of 0.1 to 0.3 GPa.

3. The vibration actuator according to claim 1 , wherein
the anodic oxide film comprises a hard anodic oxide film.

4. The vibration actuator according to claim 1 , wherein
the pigment has a hardness of 15000 to 50000 GPa.

5. The vibration actuator according to claim 1 , wherein
the pigment has a weight ratio of 20 to 50 with respect to 100 of the polyamide-imide.

6. The vibration actuator according to claim 1 , wherein
a work rate of indentation of the thermosetting resin is 30% or less.

7. The vibration actuator according to claim 1 , wherein
the fluororesin has a weight ratio of 20 to 50 with respect to 100 of the polyamide-imide.

8. A lens barrel provided with the vibration actuator according to claim 1 .

9. A camera provided with the vibration actuator according to claim 1 .

10. The vibration actuator according to claim 1 , wherein
the pigment is cobalt nickel or carbon black.

11. A vibration actuator comprising:
an oscillator configured to generate oscillations, and
a movement member that is configured to move due to the oscillations of the oscillator, wherein
one of a contact face of the oscillator with respect to the movement member and a contact face of the movement member with respect to the oscillator is a thermosetting resin film and the other is a film having an indentation hardness of 20000 to 30000 GPa,
the thermosetting resin film including a polyamide-imide resin and a fluororesin.

12. The vibration actuator according to claim 11 wherein
the thermosetting resin film has an indentation hardness of 0.1 to 0.3 GPa.

13. The vibration actuator according to claim 11 , wherein
the film comprises an anodic oxide film.

14. The vibration actuator according to claim 11 wherein
the anodic oxide film comprises a hard anodic oxide film.

15. A lens barrel provided with the vibration actuator according to claim 11 .

16. A camera provided with the vibration actuator according to claim 11 .

17. The vibration actuator according to claim 11 , wherein the fluororesin has a weight ratio of 20 to 50 with respect to 100 of the polyamide-imide.

Assignees

• Kobayashi Mina
• Inoue Mamoru
• Nikon Corp

Inventors

• Kobayashi Mina
• Inoue Mamoru

Classifications

• H02N2/163

  Motors with ring stator · CPC title

• G02B27/0006

  with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation (G02B1/18 takes precedence; cleaning in general B08B) · CPC title

• G02B7/08 Primary

  adapted to co-operate with a remote control mechanism · CPC title

• H02N2/007 Primary

  Materials · CPC title

• H02N2/12

  Constructional details · CPC title