Vibration actuator

Patent metadata

Field	Value
Publication number	US-10855156-B2
Application number	US-201916288223-A
Country	US
Kind code	B2
Filing date	Feb 28, 2019
Priority date	Feb 28, 2018
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

A vibration actuator has a movable body including a magnet, a fixing body including a coil, and an elastic support portion. The movable body vibrates in a magnetization direction of the magnet in cooperation with the coil to which power is supplied and the magnet. The fixing body has a peripheral wall portion that is disposed to surround the movable body in a direction intersecting the magnetization direction. The elastic support portion is a plate spring which has one end portion fixed to an outer periphery of the movable body opposing an inner surface of the peripheral wall portion and the other end portion fixed to the peripheral wall portion and is disposed in a radial direction from the outer periphery of the movable body. The one end portion of the elastic support portion is bonded by a fixing portion provided in the movable body.

First claim

What is claimed is:

1. A vibration actuator, comprising:
a movable body including one of a coil and a magnet disposed on a radially inner side of the coil while being spaced from the coil;
a fixing body including the other one of the coil and the magnet; and
an elastic support portion supporting the movable body in such a way that the movable body is freely movable with respect to the fixing body,
wherein the movable body vibrates with respect to the fixing body in a magnetization direction of the magnet in cooperation with the coil to which power is supplied and the magnet, wherein:
the fixing body includes a surrounding wall portion that is disposed to surround the movable body in a direction intersecting the magnetization direction,
the elastic support portion is a plate spring which includes_one end portion having an annular shape and fixed to an outer periphery of the movable body opposing an inner surface of the surrounding wall portion, and another end portion fixed to the surrounding wall portion, the plate spring being disposed in a radial direction from the outer periphery of the movable body,
the one end portion of the elastic support portion is bonded by a fixing portion provided in the movable body, and
the fixing portion includes:
a fixing stepped surface onto which the one end portion is fitted; and
a sandwiching portion that sandwiches, in combination with the fixing stepped surface, the one end portion in a state where the one end portion is fitted onto the fixing stepped surface.

2. The vibration actuator according to claim 1 ,
wherein the fixing portion is provided on an end portion on a side of the other one of the coil and the magnet in a vibration direction of the movable body.

3. The vibration actuator according to claim 1 ,
wherein a flat surface portion for fixing is provided on the outer periphery of the movable body, the flat surface portion for fixing being fixable in a sandwiched manner by a fixing jig.

4. The vibration actuator according to claim 1 ,
wherein the movable body includes a core portion to which one of the coil and the magnet is fixed, the core portion being disposed to surround both of the coil and the magnet, the core portion being formed of a covered tubular magnetic body forming the outer periphery of the movable body, and
the core portion is formed of a plate-shaped member and a ring-shaped member.

5. The vibration actuator according to claim 4 ,
wherein the fixing portion is provided on an opening edge portion of the ring-shaped member, and
a recess for avoiding interference of the elastic support portion at a time of deformation is provided in the ring-shaped member.

6. The vibration actuator according to claim 5 ,
wherein an opening range of the recess in a vibration direction is ½ to ⅔ of a movable range of the movable body.

Assignees

• Matsuyama Takanori
• Tashima Shinya
• Azumai Koichi
• Hashimoto Katsuhiro
• Mitsumi Electric Co Ltd

Inventors

• Matsuyama Takanori
• Tashima Shinya
• Azumai Koichi
• Hashimoto Katsuhiro

Classifications

• 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

• H02K33/18 Primary

  with coil systems moving upon intermittent or reversed energisation thereof by interaction with a fixed field system, e.g. permanent magnets · CPC title

• G08B6/00

  Tactile signalling systems, e.g. tactile personal calling systems · CPC title