Vibration-type actuator, image pickup apparatus, and stage

Patent metadata

Field	Value
Publication number	US-9530953-B2
Application number	US-201313938438-A
Country	US
Kind code	B2
Filing date	Jul 10, 2013
Priority date	Jul 11, 2012
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

A vibration-type actuator includes a supporting mechanism functioning such that a reaction force from a base against a pressing force from a driven member to an elastic member is dispersed to a vibrating portion and a supported portion of the elastic member. The supported portion is supported by the base with a vibration-isolating member interposed therebetween.

First claim

What is claimed is:

1. A vibration-type actuator comprising:
an electromechanical energy conversion element;
an elastic member including:
a vibrating portion to which the electromechanical energy conversion element is bonded;
a supported portion provided on a base; and
a connecting portion connecting the vibrating portion and the supported portion to each other; and

a first member having a spring characteristic and provided between the vibrating portion and the base,
wherein the vibrating portion comprises a first projecting portion and a second projecting portion arranged in a direction,
wherein the connecting portion is between the vibrating portion and the supported portion in the direction, and

wherein the base is formed of one member.

2. The vibration-type actuator according to claim 1 , wherein a reaction force from the base against a pressing force from a driven member to the vibrating portion is dispersed to the vibrating portion and the supported portion.

3. The vibration-type actuator according to claim 1 , wherein the first member having a spring characteristic is a felt member.

4. The vibration-type actuator according to claim 2 , wherein the first member having a spring characteristic is a spring.

5. The vibration-type actuator according to claim 4 , wherein the spring is a leaf spring.

6. The vibration-type actuator according to claim 1 , further comprising a second member having a vibration-isolating characteristic and provided between the vibrating portion and the base.

7. The vibration-type actuator according to claim 6 , wherein the second member having a vibration-isolating characteristic is a vibration-isolating plate having a projection.

8. The vibration-type actuator according to claim 6 , wherein the second member having a vibration-isolating characteristic is a felt member.

9. The vibration-type actuator according to claim 1 , further comprising a third member having at least one of a spring characteristic and a vibration-isolating characteristic and provided between the supported portion and the base.

10. The vibration-type actuator according to claim 9 , wherein the third member having at least one of a spring characteristic and a vibration-isolating characteristic is a felt member.

11. The vibration-type actuator according to claim 1 , further comprising an equalizer configured to adjust orientations of the electromechanical energy conversion element and the elastic member with respect to a driven member, the equalizer being provided between the vibrating portion and the base.

12. The vibration-type actuator according to claim 1 , further comprising a position-regulating member configured to regulate a position of the elastic member in a planar direction.

13. The vibration-type actuator according to claim 1 , satisfying a relationship of F3≦F1−F0, where F1 denotes a pressing force applied from a driven member to the elastic member, F2 denotes a reaction force applied from the base to the vibrating portion, F3 denotes a reaction force applied from the base to the supported portion, and F0 denotes a lower limit of the reaction force F2 at which the electromechanical energy conversion element remains bonded to the vibrating portion.

14. The vibration-type actuator according to claim 1 , wherein the vibrating portion is provided in a recess provided in the base.

15. An image pickup apparatus comprising:
an image pickup device;
a lens; and
the vibration-type actuator according to claim 1 .

16. A stage movable by the vibration-type actuator according to claim 1 .

17. A vibration-type actuator comprising:
an electromechanical energy conversion element;
an elastic member including:
a vibrating portion to which the electromechanical energy conversion element is bonded;
a supported portion provided on a base; and
a connecting portion connecting the vibrating portion and the supported portion to each other; and

a felt member provided between the vibrating portion and the base, wherein the base is formed of one member.

18. The vibration-type actuator according to claim 17 , wherein the vibrating portion is provided in a recess provided in the base.

19. An image pickup apparatus comprising:
an image pickup device;
a lens; and
the vibration-type actuator according to claim 17 .

20. A stage movable by the vibration-type actuator according to claim 17 .

Assignees

• Canon Kk

Inventors

• Yokoyama Daisuke

Classifications

• H04N23/55

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title

• H02N2/103

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

• H04N5/232

  Electricity · mapped topic

• H01L41/04 Primary

  Electricity · mapped topic

• H02N2/0015 Primary

  using only bending modes · CPC title