Linear vibration motor

Patent metadata

Field	Value
Publication number	US-10998807-B2
Application number	US-201916526959-A
Country	US
Kind code	B2
Filing date	Jul 30, 2019
Priority date	Aug 3, 2018
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

The present disclosure provides a linear vibration motor, including: a base having an accommodating space, a vibration system accommodated in the accommodating space, an elastic member configured to fix and suspend the vibration system in the accommodating space, and a drive system fixed on the base. The vibration system includes an annular magnetic steel unit fixed on the elastic member. The drive system includes a first coil and a second coil that are fixed on the base and stacked together. The magnetic steel unit surrounds both the first coil and the second coil and is disposed separately from the first coil and second coil. An orthogonal projection of the magnetic steel unit in a direction towards the drive system at least partially falls in the first coil and the second coil, respectively. Compared with related technologies, the linear vibration motor of the present disclosure has better vibration performance.

First claim

What is claimed is:

1. A linear vibration motor, comprising: a base having an accommodating space, a vibration system accommodated in the accommodating space, an elastic member configured to fix and suspend the vibration system in the accommodating space, and a drive system fixed on the base and configured to drive the vibration system to vibrate in a direction perpendicular to a horizontal direction, wherein the vibration system comprises an annular magnetic steel unit fixed on the elastic member, the drive system comprises a first coil and a second coil that are fixed on the base and stacked together, the magnetic steel unit surrounds both the first coil and the second coil and is disposed separately from the first coil and second coil, and an orthogonal projection of the magnetic steel unit in a direction towards the drive system at least partially falls in the first coil and the second coil, respectively;
wherein the magnetic steel unit comprises a first magnetic steel, a first pole core, and a second magnetic steel that are sequentially stacked, both the first magnetic steel and the second magnetic steel magnetize in a vibration direction, magnetization directions of the first magnetic steel and the second magnetic steel are opposite, an orthogonal projection of the first magnetic steel in the direction towards the drive system at least partially falls in the first coil, an orthogonal projection of the second magnetic steel in the direction towards the drive system at least partially falls in the second coil, and current directions of the first coil and the second coil are the same.

2. The linear vibration motor according to claim 1 , wherein the magnetic steel unit comprises a first magnetic steel, the first magnetic steel magnetizes in a vibration direction, an orthogonal projection of the first magnetic steel in the direction towards the drive system at least partially falls in the first coil and the second coil, respectively, and current directions of the first coil and the second coil are opposite.

3. The linear vibration motor according to claim 2 , wherein the drive system further comprises an iron core fixed on the base, and the first coil and the second coil are fixedly sleeved over the iron core and are located between the iron core and the magnetic steel unit.

4. The linear vibration motor according to claim 3 , wherein the drive system further comprises a separation plate fixedly sleeved over the iron core, and the separation plate is sandwiched between the first coil and the second coil.

5. The linear vibration motor according to claim 1 , wherein the drive system further comprises an iron core fixed on the base, and the first coil and the second coil are fixedly sleeved over the iron core and are located between the iron core and the magnetic steel unit.

6. The linear vibration motor according to claim 5 , wherein the drive system further comprises a separation plate fixedly sleeved over the iron core, and the separation plate is sandwiched between the first coil and the second coil.

7. The linear vibration motor according to claim 1 , wherein the vibration system further comprises a second pole core fixed on a side, near the elastic member, of the magnetic steel unit, one end of the elastic member is fixed on the base, and the other end of the elastic member is fixed on the second pole core.

8. The linear vibration motor according to claim 1 , wherein the vibration system further comprises a third pole core, fixed on a side, far away from the elastic member, of the magnetic steel unit.

9. The linear vibration motor according to claim 1 , wherein the linear vibration motor further comprises a baffle plate at least attached to a side of the elastic member.

10. The linear vibration motor according to claim 1 , wherein a groove is provided in the base, and the elastic member is provided with a protruding portion engaged in the groove.

11. The linear vibration motor according to claim 1 , wherein the first coil and the second coil are formed by winding one coil wire.

Assignees

• Aac Acoustic Tech Shenzhen Co Ltd

Inventors

• Zhang Tao
• Huang Jinquan

Classifications

• H02K33/16 Primary

  with polarised armatures moving in alternate directions by reversal or energisation of a single coil system · CPC title

• H02K33/10 Primary

  wherein the alternate energisation and de-energisation of the single coil system is effected or controlled by movement of the armatures · CPC title