Actuator

Patent metadata

Field	Value
Publication number	US-11323015-B2
Application number	US-201816499306-A
Country	US
Kind code	B2
Filing date	Mar 23, 2018
Priority date	Mar 30, 2017
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

An actuator is provided. In order to reduce the planar area of an actuator, a first magnetic drive circuit and a third magnetic drive circuit that vibrate a movable body in an X direction with respect to a support are provided respectively on both sides, in a Z direction, of a second magnetic drive circuit that vibrates the movable body in a Y direction with respect to the support. The movable ranges, in the X direction and the Y direction, of the movable body with respect to the support are regulated by a stopper mechanism constituted between a first magnet and a first coil holder holding a first coil, a stopper mechanism constituted between a second magnet and a second coil holder holding a second coil, and a stopper mechanism constituted between a third magnet and a third coil holder holding a third coil.

First claim

The invention claimed is:

1. An actuator comprising:
a support;
a movable body movable with respect to the support;
a first magnetic drive circuit which generates a driving force to drive the movable body in a second direction orthogonal to a first direction; and
a second magnetic drive circuit which generates a driving force to drive the movable body in a third direction orthogonal to the first direction and crossing the second direction,
wherein the first magnetic drive circuit comprises:
a first coil, held by a first coil holder provided on one side member of the support and the movable body; and
a first magnet, held by other side member of the support and the movable body, and facing, in the first direction, a first effective side portion extending in the third direction of the first coil,

wherein the second magnetic drive circuit comprises:
a second coil, held by a second coil holder provided on the one side member; and
a second magnet, held by the other side member and facing, in the first direction, a second effective side portion extending in the second direction of the second coil,

wherein the first coil holder comprises a first stopper portion facing the first magnet in the third direction to define a movable range of the movable body in the third direction, and
wherein the second coil holder comprises a second stopper portion facing the second magnet in the second direction to define a movable range of the movable body in the second direction.

2. The actuator according to claim 1 , wherein
the first coil holder comprises a first frame portion having a first opening in which the first coil is housed,
the first stopper portion comprises a portion which projects from the first frame portion in the first direction and faces the first magnet in the third direction,
the second coil holder comprises a second frame portion having a second opening in which the second coil is housed, and
the second stopper portion comprises a portion which projects from the second frame portion in the first direction and faces the second magnet in the second direction.

3. The actuator according to claim 2 , wherein
the first coil holder comprises a first seat portion which projects from the first frame portion in the first direction and supports a first invalid side portion extending in the second direction of the first coil,
the first stopper portion is constituted by a side end portion facing the first magnet of the first seat portion in the third direction,
the second coil holder comprises a second seat portion which projects from the second frame portion in the first direction and supports a second invalid side portion extending in the third direction of the second coil, and
the second stopper portion is constituted by a side end portion facing the second magnet of the second seat portion in the second direction.

4. The actuator according to claim 3 , wherein
the first stopper portion is positioned closer to the first magnet than an inner edge of the first invalid side portion, and
the second stopper portion is positioned closer to the second magnet than an inner edge of the second invalid side portion.

5. The actuator according to claim 2 , wherein
the thickness of the first frame portion in the first direction is greater than the thickness of the first coil in the first direction, and
the thickness of the second frame portion in the first direction is greater than the thickness of the second coil in the first direction.

6. The actuator according to claim 1 , wherein
the first magnetic drive circuit is arranged to overlap with the second magnetic drive circuit in the first direction.

7. The actuator according to claim 6 , wherein
a third magnetic drive circuit that generates a driving force to drive the movable body in the second direction is arranged to overlap with the second magnetic drive circuit on an opposite side to the first magnetic drive circuit with respect to the second magnetic drive circuit,
wherein the third magnetic drive circuit comprises:
a third coil, held by a third coil holder provided on the one side member; and
a third magnet, held by the other side member and facing, in the first direction, a third effective side portion extending in the third direction of the third coil, and

wherein the third coil holder comprises a third stopper portion facing the third magnet in the third direction to define a movable range of the movable body in the third direction.

8. The actuator according to claim 1 , wherein
the one side member is the support, and
the other side member is the movable body.

9. The actuator according to claim 1 , further comprising:
a first elastic member and a second elastic member provided between the movable body and the support,
the first elastic member in contact with both the movable body and a portion of the support opposed to the movable body on one side in the first direction, and
the second elastic member in contact with both the movable body and a portion of the support opposite to the movable body on the other side in the first direction.

10. The actuator according to claim 9 , wherein
each of the first elastic member and the second elastic member are adhered to the support and the movable body.

11. The actuator according to claim 9 , wherein
each of the first elastic member and the second elastic member is in a compressed state in the first direction between the support and the movable body.

12. The actuator according to claim 9 , wherein
each of the first elastic member and the second elastic member is a viscoelastic member.

13. The actuator according to claim 4 , further comprising:
a first elastic member and a second elastic member provided between the movable body and the support,
the first elastic member in contact with both the movable body and a portion of the support opposed to the movable body on one side in the first direction, and
the second elastic member in contact with both the movable body and a portion of the support opposite to the movable body on the other side in the first direction.

14. The actuator according to claim 13 , wherein
each of the first elastic member and the second elastic member are adhered to the support and the movable body.

15. The actuator according to claim 13 , wherein
each of the first elastic member and the second elastic member is in a compressed state in the first direction between the support and the movable body.

16. The actuator according to claim 13 , wherein
each of the first elastic member and the second elastic member is a viscoelastic member.

17. The actuator according to claim 6 , further comprising:
a first elastic member and a second elastic member provided between the movable body and the support,
the first elastic member in contact with both the movable body and a portion of the support opposed to the movable body on one side in the first direction, and
the second elastic member in contact with both the movable body and a portion of the support opposite to the movable body on the other side in the first direction.

18. The actuator according to claim 17 , wherein
each of the first elastic member and the second elastic member are adhered to the support and the movable body.

19. The actuator according to claim 17 , wherein
each of the first elastic member and the second elastic member is in a compressed state in the first direction between the support and the movable body.

20. The actuator according to claim 17 , wherein
each of the first e

Assignees

• Nidec Sankyo Corp

Inventors

• Kitahara Hiroshi
• Takeda Tadashi
• Tsuchihashi Masao

Classifications

• H02K33/06 Primary

  with polarised armatures · CPC title

• H02K33/10 Primary

  wherein the alternate energisation and de-energisation of the single coil system is effected or controlled by movement of the armatures · CPC title

• H02K2201/18

  Machines moving with multiple degrees of freedom · CPC title

• H02K33/16

  with polarised armatures moving in alternate directions by reversal or energisation of a single coil system · CPC title