Actuator

Patent metadata

Field	Value
Publication number	US-11329540-B2
Application number	US-201916369646-A
Country	US
Kind code	B2
Filing date	Mar 29, 2019
Priority date	Mar 30, 2018
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

An actuator may include a movable body; a support body; a connecting body arranged where the movable body and the support body face each other to contact both of the movable body and the support body; and a magnetic drive circuit. The magnetic drive circuit may include an air-core coil provided on a first-side member among the movable body and the support body; and a permanent magnet provided on a second-side member among the movable body and the support body to face the coil in a first direction, the magnetic drive circuit being configured to vibrate the movable body with respect to the support body in a second direction crossing the first direction. In the first-side member, the coil may be fixed by an adhesive to a surface of a plate-shaped coil holder on a first side in the first direction while an air-cores is directed in the first direction.

First claim

What is claimed is:

1. An actuator, comprising:
a movable body;
a support body;
a connecting body having at least one of elasticity and viscoelasticity and arranged at a position where the movable body and the support body face each other to contact both of the movable body and the support body; and
a magnetic drive circuit comprising: an air-core coil provided on a first-side member among the movable body and the support body; and a permanent magnet provided on a second-side member among the movable body and the support body to face the air-core coil in a first direction, the magnetic drive circuit being configured to vibrate the movable body with respect to the support body in a second direction crossing the first direction;
wherein
in the first-side member, the air-core coil is fixed by an adhesive to a surface of a plate-shaped coil holder on a first side in the first direction while an air-core of the air-core coil is directed in the first direction,
the permanent magnet comprises a first permanent magnet facing the air-core coil on a second side in the first direction via the coil holder and a second permanent magnet facing the air-core coil on the first side in the first direction,
the second-side member comprises a first yoke with a surface thereof on the first side in the first direction, where the surface is fixed with the first permanent magnet and a second yoke with a surface thereof on the second side in the first direction, where the surface is fixed with the second permanent magnet, and
the coil holder comprises a plate-shaped abutting unit extending from the surface of the coil holder on which the air-core coil is fixed to a side of the second yoke, facing a center portion of the air-core coil and mainly extending parallel to the air-core so that there is no contact between the air-core coil and the second permanent magnet when the movable body moves towards the air-core coil.

2. The actuator according to claim 1 , wherein the coil holder is made of a non-magnetic material.

3. The actuator according to claim 2 , wherein the coil holder is made of a metal plate.

4. The actuator according to claim 3 , wherein the coil holder is made of a stainless steel plate.

5. The actuator according to claim 4 , wherein an end of the coil holder extends in the first direction to form a bend portion for reinforcement.

6. The actuator according to claim 5 , wherein a rib-shaped convexity protruding to the first side or the second side in the first direction extends in the coil holder.

7. The actuator according to claim 6 , wherein the coil holder includes:
a first positioning hole overlapping with an end of the air-core, the first positioning hole being on a first side in a third direction crossing the first direction and the second direction; and
a second positioning hole overlapping with an end of the air-core, the second positioning hole being on a second side in the third direction.

8. The actuator according to claim 1 , wherein the connecting body is a viscoelastic member arranged at a position where the movable body and the support body face each other in the first direction.

9. The actuator according to claim 8 , wherein the connecting body adheres to both the support body and the movable body.

10. The actuator according to claim 9 , wherein the viscoelastic member is arranged in a compressed state in the first direction.

11. The actuator according to claim 10 , wherein the first-side member is the support body, and
the second-side member is the movable body.

12. The actuator according to claim 11 , wherein the support body comprises a cover configured to hold an end of the coil holder.

13. The actuator according to claim 12 , wherein the support body comprises a first cover member configured to support the end of the coil holder from the first side in the first direction, and a second cover member configured to hold the end of the coil holder from the second side in the first direction.

14. The actuator according to claim 1 , wherein an end of the coil holder extends in the first direction to form a bend portion for reinforcement.

15. The actuator according to claim 1 , wherein a rib-shaped convexity protruding to the first side or the second side in the first direction extends in the coil holder.

16. The actuator according to claim 1 , wherein the coil holder includes:
a first positioning hole overlapping with an end of the air-core, the first positioning hole being on a first side in a third direction crossing the first direction and the second direction; and
a second positioning hole overlapping with an end of the air-core, the second positioning hole being on a second side in the third direction.

17. The actuator according to claim 1 , wherein the connecting body is a viscoelastic member arranged at a position where the movable body and the support body face each other in the first direction.

18. The actuator according to claim 17 , wherein the connecting body adheres to both the support body and the movable body.

19. The actuator according to claim 17 , wherein the viscoelastic member is arranged in a compressed state in the first direction.

20. The actuator according to claim 1 , wherein the first-side member is the support body, and
the second-side member is the movable body.

21. The actuator according to claim 20 , wherein the support body comprises a cover configured to hold an end of the coil holder.

22. The actuator according to claim 21 , wherein the support body comprises a first cover member configured to support the end of the coil holder from the first side in the first direction, and a second cover member configured to hold the end of the coil holder from the second side in the first direction.

Assignees

• Nidec Sankyo Corp

Inventors

• Tsuchihashi Masao
• Takeda Tadashi
• Kitahara Hiroshi

Classifications

• H02K33/06

  with polarised armatures · CPC title

• H02K33/16 Primary

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

• B06B1/045 Primary

  using vibrating magnet, armature or coil system · CPC title

• H02K7/065

  Electromechanical oscillators; Vibrating magnetic drives · CPC title