Linear vibration motor with magnets fixed to a base and coils fixed to a weight

Patent metadata

Field	Value
Publication number	US-11462986-B2
Application number	US-201916705265-A
Country	US
Kind code	B2
Filing date	Dec 6, 2019
Priority date	Dec 27, 2018
Publication date	Oct 4, 2022
Grant date	Oct 4, 2022

Abstract

An embodiment of the invention provides a linear vibration motor. The linear vibration motor includes a base with a containing space, a vibration unit arranged in the containing space, an elastic piece suspending the vibration unit in the containing space, and a magnet assembly fixed to the base and driving the vibration unit to vibrate. The vibration unit includes a weight, a containing groove penetrating through the weight and at least one pair of coils which are oppositely fixed to the weight. The magnet assemblies has two magnets which are respectively fixed on two opposite sides of the base. The two magnets are at least partially located in the containing grooves, and are magnetized in the vibration direction. Compared with the related art, the linear vibration motor is improved in vibration performance and reliability.

First claim

What is claimed is:

1. A linear vibration motor, comprising:
a base with an accommodating space;
a vibration unit located in the accommodating space, including a weight, a containing groove penetrating the weight along a vibration direction of the vibration unit, at least one pair of coils oppositely spaced from each other in the containing groove and respectively fixed to the weight, each of the coils forming a through hole;
a magnet assembly fixed to the base for driving the vibration unit to vibrate, including two magnets respectively fixed on two opposite sides of the base along the vibration direction of the vibration unit, each magnet being at least partially accommodated in the containing groove and aligned with but spaced from one corresponding through hole formed by one of the respective coils;
an elastic piece for suspending the vibration unit in the accommodating space located on one side of the vibration unit along the vibration direction of the vibration unit; wherein
the two magnets are magnetized along the vibration direction and the two magnets each having magnetic poles arranged opposite to each other, the magnet assembly further comprises an iron core sandwiched between the two magnets, and the iron core keeps a distance from the pair of coils, the through hole of one of the respective coils is disposed opposite to the iron core.

2. The linear vibration motor as described in claim 1 , wherein the weight further comprises two fixing grooves recessed outwards from two opposite sides of the containing groove; each of the two coils is respectively fixed in a corresponding one of the fixing grooves.

3. The linear vibration motor as described in claim 2 , wherein a depth of each respective fixing groove is equal to a thickness of the respective coil.

4. The linear vibration motor as described in claim 1 , wherein the elastic piece comprises a ring-shaped first fixing arm, a ring-shaped second fixing arm and a spring arm connecting the first fixing arm to the second fixing arm; the first fixing arm is arranged around a periphery of the containing groove and is fixedly connected with the weight, the second fixing arm is connected to the base for suspending the spring arm.

5. The linear vibration motor as described in claim 4 , wherein the elastic piece further comprises a reinforcing arm bending and extending from a periphery of the second fixing arm, and the reinforcing arm connects to the base.

6. The linear vibration motor as described in claim 3 , wherein the weight includes a fixing platform protruding from one end thereof adjacent to the elastic piece toward the elastic piece, the fixing platform extends along the periphery of the containing groove, and the first fixing arm is sleeved on the fixing platform for fixing the first fixing arm.

Assignees

• Aac Technologies Pte Ltd

Inventors

• Tang Yun
• Mao Lubin

Classifications

• H02K33/18 Primary

  with coil systems moving upon intermittent or reversed energisation thereof by interaction with a fixed field system, e.g. permanent magnets · CPC title

• B06B1/045 Primary

  using vibrating magnet, armature or coil system · CPC title

• H02K33/14

  wherein the alternate energisation and de-energisation of the two coil systems are effected or controlled by movement of the armatures · CPC title