Linear vibration motor with casing having copper ring and vibration unit with magnetic steel assembly

Patent metadata

Field	Value
Publication number	US-11949309-B2
Application number	US-202217833759-A
Country	US
Kind code	B2
Filing date	Jun 6, 2022
Priority date	May 6, 2021
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

The present disclosure provides a linear vibration motor, including a casing with an accommodation space, a vibration unit accommodated in the accommodation space, a vibration unit suspended in the accommodation space and a coil fixed on the casing and driving the vibration unit to vibrate. The casing includes a copper ring arranged around the vibration unit. In the linear vibration motor provided by the utility model, the copper ring is arranged around the vibration unit to provide a damping function for the linear vibration motor. Compared with the foam damping member in the related art, the linear vibration motor provided by the present disclosure may be arranged by an automatic device during the production and manufacture of the linear vibration motor, thereby greatly improving the production efficiency, and improving the automation degree.

First claim

What is claimed is:

1. A linear vibration motor, comprising:
a casing with an accommodating space;
a vibration unit accommodated in the accommodating space;
an elastic member suspending the vibration unit in the accommodating space; and
a coil fixed to the casing and driving the vibration unit to vibrate;
wherein the casing comprises a copper ring arranged around the vibration unit;
the vibration unit comprises a magnetic steel assembly, wherein the magnetic steel assembly comprises a plurality of first magnetic steels arranged along a vibration direction of the vibration unit, the first magnetic steels are magnetized along a direction perpendicular to the vibration direction of the vibration unit, magnetization directions of two adjacent first magnetic steels are opposite, and the first magnetic steels together form a magnetic circuit the vibration unit further comprises a mass block sandwiched between two adjacent first magnetic steels and an annular connecting member connecting the first magnet steels and the elastic member.

2. The linear vibration motor of claim 1 , wherein the coil is attached to a side of the copper ring close to the vibration unit.

3. The linear vibration motor of claim 1 , wherein the casing, the vibration unit, the coil and the elastic member are coaxially arranged.

4. The linear vibration motor of claim 1 , wherein the first magnetic steels are ring-shaped magnetic steels, and the first magnetic steels are magnetized in a radial direction.

5. The linear vibration motor of claim 4 , wherein the annular connecting member comprises a body connected to the first magnetic steels and a connecting portion welded and fixed to the elastic member.

Assignees

• Aac Microtech Changzhou Co Ltd

Inventors

• Li Ziang
• Cui Zhiyong
• Shao Yan

Classifications

• H02K33/04 Primary

  wherein the frequency of operation is determined by the frequency of uninterrupted AC energisation · CPC title

• H02K33/16 Primary

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