# US 12,003,156 B2 · Vibration actuator with plate springs including planar, spiral deformation arms

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,003,156 B2
- Document ID: US12003156B2
- Status: Granted
- Kind: B2
- Application number: 17/561,956
- Filed: 2021-12-26
- Published: 2022-04-21
- Granted: 2024-06-04
- 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/US12003156B2

## 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 includes: a movable body including: a disk-shaped magnet; a pair of disk-shaped cores fixed on front and rear surfaces of the disk-shaped magnet and each having an opening at a center thereof; a pair of leaf springs having a substantially circular shape; and a pair of spring stopper weight parts each having one end positioned by joining the opening to be joined with one of the disk-shaped cores and having another end connected to a central part of one of the leaf springs; and a fixing body including an annular coil and configured to support and accommodate therein the movable body such that the disk-shaped magnet, the disk-shaped cores and the spring stopper weight parts are capable of vibrating in an axial direction inside the annular coil.

## Claims

### Claim 1

A vibration actuator comprising:
a movable body comprising: a disk-shaped magnet; a pair of disk-shaped cores fixed on front and rear surfaces of the disk-shaped magnet and each having an opening at a center in a radial direction thereof; a pair of leaf springs having a substantially circular shape, each of the leaf springs including a plurality of deformation arms forming a planar, spiral shape in a common plane extending in the radial direction; and
a pair of spring stopper weight parts each having one end positioned by joining the opening to be joined with one of the disk-shaped cores and having another end connected to a central part of one of the leaf springs; and
a fixing body comprising an annular coil and configured to support and accommodate therein the movable body such that the disk-shaped magnet, the disk-shaped cores and the spring stopper weight parts are capable of vibrating in an axial direction inside the annular coil, wherein
each of the leaf springs is provided with a damper as a bridge between spring portions in each of the leaf springs.

### Claim 2 (depends on 1)

The vibration actuator according to claim 1, wherein the movable body is configured to vibrate in an axial direction thereof by a thrust force generated by interaction between a magnetic field of the disk-shaped magnet and current flowing in the annular coil.

### Claim 3 (depends on 1)

The vibration actuator according to claim 1, wherein the annular coil includes a pair of coils wound in opposite directions such that current flows in opposite directions upon energization.

### Claim 4 (depends on 1)

The vibration actuator according to claim 1, wherein a central position of the disk-shaped magnet in the axial direction is a substantially same position as a central position of length in the axial direction of the annular coil.

### Claim 5 (depends on 1)

An electronic apparatus comprising the vi gyration actuator according to claim 1.