Vibration actuator and vibration presenting apparatus

Patent metadata

Field	Value
Publication number	US-11863039-B2
Application number	US-202218053392-A
Country	US
Kind code	B2
Filing date	Nov 8, 2022
Priority date	Oct 31, 2018
Publication date	Jan 2, 2024
Grant date	Jan 2, 2024

Abstract

Provided is a vibration actuator that includes: a coil; a core around which the coil is wound, the core including both ends projecting from the coil; a yoke formed of a magnetic material and disposed opposite to the both ends of the core at a position adjacent to the both ends of the core with a gap provided between the yoke and the both ends of the core in a direction orthogonal to a winding axis of the coil; and an elastic part fixed between the core and the yoke and configured for elastic support to enable a movement between the core and the yoke in a direction opposite to at least one of the both ends of the core.

First claim

What is claimed is:

1. A vibration actuator, comprising:
a coil;
a core around which the coil is wound, the core including both ends projecting from the coil;
a yoke formed of a magnetic material and disposed opposite to the both ends of the core at a position adjacent to the both ends of the core with a gap provided between the yoke and the both ends of the core in a direction orthogonal to a winding axis of the coil; and
an elastic part fixed between the core and the yoke and configured for elastic support to enable a movement between the core and the yoke in a direction opposite to at least one of the both ends of the core.

2. The vibration actuator according to claim 1 , further comprising:
a fixing part including the coil and the core; and
a movable part including the yoke, the movable part being fixable to an operation contact surface part that is operated by contact, wherein
the elastic part is a plate-shaped elastic part including an elastically deformable bellows-shaped part.

3. The vibration actuator according to claim 2 , wherein a plurality of the elastic parts are fixed at symmetrical positions with respect to a center of the movable part.

4. The vibration actuator according to claim 2 , wherein the plate-shaped elastic part connects the movable part and the fixing part together, and includes at least two or more arm parts each having the bellows-shaped part.

5. The vibration actuator according to claim 2 , wherein:
the plate-shaped elastic part is formed of a magnetic material, and
a movable-body side attachment part of the plate-shaped elastic part is disposed in a winding axis direction of the coil or a direction orthogonal to the winding axis direction with respect to each of the both ends of the core, and forms a magnetic path together with the core when the coil is energized.

6. The vibration actuator according to claim 2 , wherein:
the fixing part comprises a base part including a fixing-part side opening part to which a part of the coil is inserted and disposed, and
the core is fixed to the base part in a state where a part of the coil is disposed inside the fixing-part side opening part.

7. The vibration actuator according to claim 2 , wherein the plate-shaped elastic part is fixed by a screw or a rivet.

8. The vibration actuator according to claim 2 , wherein the plate-shaped elastic part includes a strain sensor for detecting a push-in amount when the plate-shaped elastic part is pushed in.

9. The vibration actuator according to claim 2 , wherein the fixing part includes an electrostatic capacitance sensor for detecting a push-in amount when the plate-shaped elastic part is pushed in, the electrostatic capacitance sensor being provided opposite to the plate-shaped elastic part.

10. The vibration actuator according to claim 2 , wherein the plate-shaped elastic part is a member integrated with the yoke.

11. The vibration actuator according to claim 1 , wherein
the core is formed in an H-type shape and the both ends of the core project in a direction orthogonal to a winding axis direction of the coil in a portion around which the coil is wound, the both ends are projected in a direction orthogonal to the winding axis direction of the coil, and the core includes counter surface parts provided in parallel to each other with a space interposed therebetween, each of the counter surface parts being provided opposite to the yoke via the gap.

12. The vibration actuator according to claim 1 , wherein the yoke is disposed with the gap provided in the direction crossing with the winding axis of the coil with respect to the both ends of the core, and includes, at a position opposite to the coil, an opening part to which the coil is inserted.

13. A vibration presenting apparatus, comprising:
the vibration actuator according to claim 1 ; and
a touch panel on which the vibration actuator is mounted.

Assignees

• Takahashi Yuki
• Ishitani Tomoya
• Minebea Mitsumi Inc

Inventors

• Takahashi Yuki
• Ishitani Tomoya

Classifications

• H02K33/06 Primary

  with polarised armatures · CPC title

• H02K33/16

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

• B06B1/045

  using vibrating magnet, armature or coil system · CPC title

• H02K33/00 Primary

  Motors with reciprocating, oscillating or vibrating magnet, armature or coil system (arrangements for handling mechanical energy structurally associated with motors H02K7/00, e.g. H02K7/06) · CPC title

• H02K33/02 Primary

  with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs · CPC title