# US 2017/0288519 A1 · Linear Vibrator

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- Number: US 2017/0288519 A1
- Document ID: US20170288519A1
- Status: Published application
- Kind: A1
- Application number: 15/478,653
- Filed: 2017-04-04
- Published: 2017-10-05
- Earliest claimed: 2016-04-05
- Assignees: EM-TECH Co., Ltd.
- Applicants: EM-TECH. Co., Ltd.
- Inventors: Jong Dae Kim; Keun Yong Hwang
- Web page: https://patentgrep.com/patent/US20170288519A1

## CPC

- H02K 33/00: Motors with reciprocating, oscillating or vibrating magnet, armature or coil system (arrangements for handling mechanical energy structurally associated with motors H02K7/00, e.g. H02K7/06)
- H02K 33/16: with polarised armatures moving in alternate directions by reversal or energisation of a single coil system
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A linear vibrator includes a bracket having a plate shape, a casing having a hexahedral shape with an open bottom and coupled to the bracket, a circuit board on the bracket, a coil on the circuit board, a pair of magnets spaced apart from each other and disposed over the coil at an interval from the coil, a plate having a pair of magnet attachment surfaces attached to top surfaces of the pair of magnets and a connection surface downwardly bent with a step difference from the magnet attachment surfaces and connecting the pair of magnet attachment surfaces, a weight on top of the plate, and a spring on top of the connection surface and formed in a strip shape with two ends secured to the casing and a center portion secured to the connection surface. The spring is bilateral symmetric and has at least a pair of inwardly-bent portions.

## Claims

### Claim 1

A linear vibrator, comprising:
a bracket formed in a plate shape;
a casing formed in a hexahedral shape with an open bottom and coupled to the bracket;
a circuit board disposed on the bracket;
a coil disposed on the circuit board;
a pair of magnets spaced apart from each other and disposed over the coil at an interval from the coil;
a plate having a pair of magnet attachment surfaces attached to top surfaces of the pair of magnets and a connection surface downwardly bent with a step difference from the magnet attachment surfaces and connecting the pair of magnet attachment surfaces;
a weight disposed on top of the plate; and
a spring disposed on top of the connection surface and formed in a strip shape with two ends secured to the casing and a center portion secured to the connection surface,
wherein the spring is bilateral symmetric and has at least a pair of inwardly-bent portions.

### Claim 2 (depends on 1)

The linear vibrator of claim 1, wherein a small-width portion having a smaller width than the other portions is formed at the center portion of the spring.

### Claim 3 (depends on 1)

The linear vibrator of claim 1, wherein the spring has holes in bilateral symmetric positions.

### Claim 4 (depends on 1)

The linear vibrator of claim 1, wherein the center portion of the spring has a hole, wherein the connection surface of the plate has a protrusion to be fitted into the hole, and wherein the spring and the plate are secured to each other by a welding with the protrusion of the plate fitted into the hole of the center portion of the spring.

### Claim 5 (depends on 1)

The linear vibrator of claim 1, wherein the casing has slits at both sides so that the two ends of the spring can be drawn out through the slits.

### Claim 6 (depends on 5)

The linear vibrator of claim 5, wherein the two ends of the spring have holes, wherein the casing has protrusions in portions contacting the two ends of the spring drawn out, and wherein the spring and the casing are secured to each other by a welding with the protrusions of the casing fitted into the holes of the two ends of the spring.

### Claim 7 (depends on 5)

The linear vibrator of claim 5, wherein the two ends of the spring are elastically deformed to pressurize contacting surfaces of the casing and secured to the casing by the welding.

### Claim 8 (depends on 1)

The linear vibrator of claim 1, wherein both ends of the weight downwardly extend to cover side surfaces of the plate and magnets.

### Claim 9 (depends on 1)

The linear vibrator of claim 1, wherein during vibration of the magnets, the plate and the weight an amplitude center is biased with respect to a geographical center of the linear vibrator.