Actuator and electric beauty device

Patent metadata

Field	Value
Publication number	US-2018215055-A1
Application number	US-201615749898-A
Country	US
Kind code	A1
Filing date	Aug 2, 2016
Priority date	Aug 4, 2015
Publication date	Aug 2, 2018
Grant date	—

Abstract

Provided is an actuator that has a simple configuration and can stably achieve high output. This actuator has: a movable body provided with a cylindrical magnet section alternately having N-pole faces and S-pole faces on a peripheral surface thereof along the circumferential direction; a fixed body provided with pole tooth surfaces disposed facing the peripheral surface a magnet section and a coil that excites the pole tooth sections; and a spring material holds the movable body to the fixed body in a freely movable manner. The spring material is fixed to at least one of the movable body and the fixed body via a joint section. The joint section has a fixing part for fixing and end section of the spring material, and a stress relaxation part that is disposed in proximity to the fixing part and relaxes stress generated during deformation of the spring material.

First claim

1 . An actuator comprising:
a movable body including a cylindrical magnet section including N-pole faces and S-pole faces circumferentially alternately on a circumferential surface; a fixed body including a number of pole teeth surfaces arranged circumferentially so as to face the circumferential surface of the magnet section, the number of pole teeth surfaces being equal to a number of the N-pole faces and the S-pole faces, and a coil that upon supply of a current, excites the pole teeth surfaces so that the pole teeth surfaces have circumferentially alternately different polarities; and a spring material connected to the movable body and the fixed body, the spring material causing the fixed body to movably hold the movable body, wherein with a position at which a circumferential center of each pole teeth surface and a switching position between corresponding pole faces in the magnet section face each other as a turning reference position, the movable body circumferentially turns back and forth upon supply of an alternate current having a frequency that is substantially equal to a resonant frequency of the movable body to the coil section, the spring material is fixed to at least one of the movable body and the fixed body via a joint part, and the joint part includes an attachment portion to which a distal end side of an end portion of the spring material is fixedly attached, and a stress relaxation section disposed adjacent to the attachment portion, the stress relaxation section relaxing stress generated upon deformation of the spring material, at an end portion of the spring material.

2 . The actuator according to claim 1 , wherein a part of the stress relaxation section is in contact with the spring material.

3 . The actuator according to claim 1 , wherein the attachment portion is fixedly attached to the distal end side of the end portion of the spring material via welding.

4 . The actuator according to claim 1 , wherein the attachment portion and the stress relaxation section are provided in a fixation position adjustment section capable of adjusting a position of fixation of the spring material to at least one of the movable body and the fixed body.

5 . The actuator according to claim 4 , wherein the fixation position adjustment section fixes the spring material to at least one of the movable body and the fixed body via screw fixation.

6 . The actuator according to claim 1 , wherein each of the attachment portion and the stress relaxation section is provided in the spring material via outsert molding.

7 . The actuator according to claim 1 , wherein the attachment portion and the stress relaxation section include an elastic member that holds the spring material between the elastic member and at least one of the movable body and the fixed body, and a screw portion that deforms the elastic member to fix the spring material to at least one of the movable body and the fixed body.

8 . The actuator according to claim 1 , wherein the spring material is connected, together with the attachment portion and the stress relaxation section, to at least one of the movable body and the fixed body, via bonding.

9 . The actuator according to claim 1 , wherein:
the spring material is connected to at least the movable body from among the movable body and the fixed body via the attachment portion and the stress relaxation section; and the attachment portion is welded to a shaft portion of the movable body.

10 . The actuator according to claim 1 , wherein the movable body includes:
a cover member including a circumferential wall portion including an inner circumferential surface on which the cylindrical magnet section is disposed and a sheet-like lid portion disposed so as to cover the fixed body, the sheet-like lid portion occluding an opening of the circumferential wall portion; and a rotation shaft disposed orthogonally at a center of the lid portion of the cover member, the rotation shaft being fixed to the lid portion via welding.

11 . The actuator according to claim 1 , wherein the magnet section includes a recess for positioning relative to the fixed body.

12 . An electric beauty device comprising an actuator according to claim 1 .

Assignees

• Takahashi Yuki
• Kamijo Masami
• Sakaguchi Kazutaka
• Kitamura Yasutaka
• Kagami Masaharu
• Inamoto Shigenori
• Mitsumi Electric Co Ltd

Inventors

• Takahashi Yuki
• Kamijo Masami
• Sakaguchi Kazutaka
• Kitamura Yasutaka
• Kagami Masaharu
• Inamoto Shigenori

Classifications

• F16F15/1216

  Torsional springs, e.g. torsion bar or torsionally-loaded coil springs · CPC title

• B26B19/28 Primary

  Drive layout for hair clippers or dry shavers, e.g. providing for electromotive drive (electric motors per se H02) · CPC title

• H02K21/227

  having an annular armature coil · CPC title

• A61C17/34

  driven by electric motor · CPC title

• H02K33/16 Primary

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