# US 11,444,524 B2 · Vibration actuator and electronic equipment

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- Number: US 11,444,524 B2
- Document ID: US11444524B2
- Status: Granted
- Kind: B2
- Application number: 17/561,954
- Filed: 2021-12-26
- Published: 2022-04-21
- Granted: 2022-09-13
- Earliest claimed: 2018-08-28
- Assignees: MINEBEA MITSUMI Inc.
- Applicants: Yuki Takahashi; Chikara Sekiguchi; Shigeyuki Shimomura; Daisuke Kodama; Yuta Yoshii; Yasutaka Kitamura; Shigenori Inamoto
- Inventors: Yuki Takahashi; Chikara Sekiguchi; Shigeyuki Shimomura; Daisuke Kodama; Yuta Yoshii; Yasutaka Kitamura; Shigenori Inamoto
- Web page: https://patentgrep.com/patent/US11444524B2

## CPC

- B06B 1/045: {using vibrating magnet, armature or coil system}
- H02K 33/06: with polarised armatures
- H02K 33/16: with polarised armatures moving in alternate directions by reversal or energisation of a single coil system
- B06B: METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, {e.g.} FOR PERFORMING MECHANICAL WORK IN GENERAL (for particular applications, see the relevant subclasses, e.g. B07B1/40, B23Q17/12, B24B31/06; measurement of mechanical vibrations G01H; in direction finding, locating, distance or velocity measuring G01S; {generating seismic energy G01V1/02}; control of mechanical vibrations in general G05D; sound-producing devices, e.g. bells, sirens, whistles G10K, {e.g. methods or devices for transmitting, conducting, or directing sound in general G10K11/00}; generation of electrical oscillations H03B; electromechanical resonators in general H03H; electromechanical transducers {for communication techniques, e.g. microphones, speakers} H04R)
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A vibration actuator has a movable body and a fixing body. The movable body includes: a disk-shaped magnet; annular cores each having an opening at a center thereof; and spring stopper weight parts, and stacked such that the magnet is disposed at a center of the movable body, the annular cores is fixed on front and rear surfaces of the magnet in its axial direction, and the spring stopper weight parts are joined with the annular cores at the opening. Each spring stopper weight part includes: a spring fixing part connecting to one of the elastic support parts; a joining protrusion part inserted into the opening of one of the annular cores; and a weight body part provided between the spring fixing part and the joining protrusion part, having a larger diameter, and disposed to face and join with an annular surface of one of the annular cores.

## Claims

### Claim 1

A vibration actuator comprising:
a movable body comprising: a disk-shaped magnet; a pair of annular cores each having an opening at a center thereof; and a pair of spring stopper weight parts, and stacked such that the disk-shaped magnet is disposed at a center of the movable body, the pair of annular cores are fixed on front and rear surfaces of the magnet in an axial direction of the magnet, and the pair of the spring stopper weight parts are joined with the annular cores at the opening; and
a fixing body, having a cylindrical shape, configured to support the spring stopper weight parts by a pair of elastic support parts and accommodate therein the movable body such that the movable body is capable of reciprocally vibrating in the axial direction, and comprising a pair of annular coils disposed outside the movable body in a radial direction thereof,
wherein each of the spring stopper weight parts comprises:
a spring fixing part provided at one end in the axial direction and connecting in the axial direction to one of the elastic support parts;
a joining protrusion part provided at another end and inserted into the opening of one of the annular cores; and
a weight body part provided between the spring fixing part and the joining protrusion part, having a larger diameter than both ends, and disposed to face and join with an annular surface of one of the annular cores.

### Claim 2 (depends on 1)

The vibration actuator according to claim 1,
wherein each of the spring stopper weight parts is adjusted in weight by a weight disposed at a position of the opening of one of the annular cores.

### Claim 3 (depends on 1)

The vibration actuator according to claim 1,
wherein each of the spring stopper weight part is a non-magnetic body.

### Claim 4 (depends on 1)

The vibration actuator according to claim 1,
wherein a fixation pin is fixed to the spring fixing part to sandwich one of the elastic support parts together with the spring fixing part,
the fixation pin comprises: a pin body that is inserted into a through hole provided to the spring fixing part; and a flange disposed to sandwich the one of the elastic support parts together with the spring fixing part when the pin body is inserted into the through hole.

### Claim 5 (depends on 1)

An electronic apparatus comprising the vibration actuator according to claim 1.