# US 2017/0288523 A1 · Linear vibration motor

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

- Number: US 2017/0288523 A1
- Document ID: US20170288523A1
- Status: Published application
- Kind: A1
- Application number: 15/507,378
- Filed: 2015-08-31
- Published: 2017-10-05
- Earliest claimed: 2014-09-05
- Assignees: Nidec Copal Corporation
- Applicants: Nidec Copal Corporation
- Inventors: Yoshinori KATADA
- Web page: https://patentgrep.com/patent/US20170288523A1

## CPC

- H02K 33/16: with polarised armatures moving in alternate directions by reversal or energisation of a single coil system
- B06B 1/045: {using vibrating magnet, armature or coil system}
- H02K 33/18: with coil systems moving upon intermittent or reversed energisation thereof by interaction with a fixed field system, e.g. permanent magnets
- H02P 25/032: Reciprocating, oscillating or vibrating motors
- H02K 5/00: Casings; Enclosures; Supports
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- 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)
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

## Abstract

A linear vibration motor has a movable element including a magnet and a weight, and an elastic member are inserted into a frame. The frame supports the movable element so the movable element can freely slide axially; a coil fixed to the frame and drives the magnet axially; and an elastic member applying, to the movable element, an elastic force against the driving force of the magnet. The frame has a bottom surface plate with a bottom surface affixing the coil; an upper surface plate has an upper surface opposing the bottom surface; and a front surface plate facing the axially and supports the elastic member. The bottom surface plate has partial side surface portions that are respectively bent from both side edges of the bottom surface portion and in which an opening is formed in a central part of the partial side surface portions in the axial direction.

## Claims

### Claim 1

A linear vibration motor comprising:
a movable element comprising a magnet and a weight;
a frame for supporting the movable element so as to be able to slide along the axial direction;
a coil, secured to the frame, for driving the magnet along the axial direction;
an elastic member applying, to the movable element, an elastic force that opposes the driving force that is applied to the magnet,
a bottom plate comprising a bottom face portion whereon the coil is secured;
a top plate comprising a top face portion that faces the bottom face portion; and
end plates, facing the axial direction, supporting the elastic member,
wherein the bottom plate has a partial side face portion that is bent from a side edge of the bottom face portion, wherein an open portion is formed in a center part along the axial direction.

### Claim 2 (depends on 1)

The linear vibration motor as set forth in claim 1,
wherein the top plate has a partial side face portion, blocking the opening portion, bent from a side edge of the top face portion.

### Claim 3 (depends on 1)

The linear vibration motor as set forth in claim 1,
wherein a joining portion for the magnet and the weight is exposed in the opening portion.

### Claim 4 (depends on 1)

The linear vibration motor as set forth in any one of claim 1,
wherein the end face plate is joined to an edge, in the axial direction, at the bottom plate.

### Claim 5 (depends on 4)

The method for manufacturing a linear vibration motor as set forth in claim 4, comprising the steps of:
securing the coil to the bottom face portion;
inserting the other end side of the magnet, wherein the weight is joined to one end side thereof in the axial direction, into an opening of the coil, and joining the weight to the other end side of the magnet;
joining the end face plate to an edge, in the axial direction, at the bottom plate;
providing the elastic member between an end portion of the weight and the end face plate; and
orienting the top face portion facing the bottom face portion, and joining the bottom plate and the top plate.

### Claim 6 (depends on 1)

A mobile information terminal comprising a linear vibration motor as set forth in claim 1.