CN219477823U

CN219477823U - Linear vibration motor

Info

Publication number: CN219477823U
Application number: CN202320235241.9U
Authority: CN
Inventors: 陈为博; 周晓荣
Original assignee: AAC Microtech Changzhou Co Ltd
Current assignee: AAC Microtech Changzhou Co Ltd
Priority date: 2023-02-16
Filing date: 2023-02-16
Publication date: 2023-08-04
Anticipated expiration: 2033-02-16

Abstract

The linear vibration motor comprises a shell, a vibration assembly and a stator assembly, wherein the vibration assembly comprises a mass block, magnetic steel fixed on the mass block and an elastic piece for driving the mass block to reciprocate; the elastic member includes a first fixed portion fixed to the housing, a first elastic portion extending from one end of the first fixed portion toward the mass, a second fixed portion extending from the first elastic portion to be fixed to the mass, a second elastic portion extending from the other end of the first elastic portion toward the mass, and a third fixed portion extending from the second elastic portion to be fixed to the mass; the first elastic part and the second elastic part are positioned at two sides of the first central axis along the first central axis of the first fixing part and are of an asymmetric structure. The linear vibration motor provided by the utility model has good reliability.

Description

Linear vibration motor

[ field of technology ]

The present utility model relates to a motor, and more particularly, to a linear vibration motor for use in the field of mobile electronic devices.

[ background Art ]

With the development of electronic technology, portable consumer electronic products, such as mobile phones, handheld game devices, navigation devices, or handheld multimedia entertainment devices, are increasingly being touted by people, and these electronic products generally use linear vibration motors to perform system feedback, such as incoming call prompt, information prompt, navigation prompt, vibration feedback of the game devices, etc.

The related art linear vibration motor includes a housing having an accommodating space, a vibration assembly located in the accommodating space, and a stator assembly fixed to the housing; the stator assembly comprises a coil, the vibration assembly comprises a mass block, magnetic steel and an elastic piece for supporting the mass block in the accommodating space, and the coil and the magnetic steel interact to generate driving force to drive the vibration assembly to vibrate in a reciprocating manner, so that vibration sense is provided.

However, in the structure of the linear vibration motor in the related art, the elastic member includes two elastic arms symmetrically disposed, and in the related art, the elastic arms are of a structure extending in a straight line, and in the vibration process, the elastic arms are easy to generate stress concentration to generate sound and break, so that the reliability of the linear vibration motor is low.

Accordingly, it is necessary to provide a new linear vibration motor to solve the above-mentioned problems.

[ utility model ]

Based on the above problems, the present utility model proposes a linear vibration motor with high reliability.

In order to achieve the above-mentioned objective, the present utility model provides a linear vibration motor, which includes a housing having an accommodating space, and a vibration assembly and a stator assembly accommodated in the accommodating space, wherein the vibration assembly includes a mass block accommodated in the accommodating space, a magnetic steel fixed on the mass block, and an elastic member driving the mass block to reciprocate; the stator assembly comprises a coil which is arranged opposite to the magnetic steel, and the elastic piece comprises a first fixing part fixed on the shell, a first elastic part extending from one end of the first fixing part towards the mass block, a second fixing part extending from the first elastic part to be fixed on the mass block, a second elastic part extending from the other end of the first elastic part towards the mass block and a third fixing part extending from the second elastic part to be fixed on the mass block; the first elastic part and the second elastic part are positioned at two sides of the central axis along the first central axis of the first fixing part and are of an asymmetric structure.

Preferably, the first elastic portion includes a first elastic arm extending from the first fixing portion, a second elastic arm connected to the second fixing portion, and a first bending portion connecting the first elastic arm and the second elastic arm, and an extending direction of the first elastic arm intersects an extending direction of the second elastic arm.

Preferably, the first elastic portion further includes a second bending portion extending from the second elastic arm and a third elastic arm extending from the second bending portion, the third elastic arm is connected with the second fixing portion, and an extending direction of the third elastic arm intersects with an extending direction of the second elastic arm.

Preferably, the first elastic portion further includes a third bending portion extending from the third elastic arm and a fourth elastic arm extending from the third bending portion to be connected with the second fixing portion, and an extending direction of the fourth elastic arm intersects with an extending direction of the third elastic arm.

Preferably, the first bending portion, the second bending portion and the third bending portion are all arc-shaped.

Preferably, the extending direction of the second elastic portion is a straight line.

Preferably, the included angle between the first elastic arm and the second elastic arm is an obtuse angle, and the included angle between the third elastic arm and the fourth elastic arm is an obtuse angle.

Preferably, the included angle between the second spring arm and the third spring arm is a right angle.

Preferably, the number of the elastic pieces is two, the two elastic pieces are respectively arranged on two sides of the mass block along the vibration direction, and the two elastic pieces are in a rotationally symmetrical structure along a second central axis of the mass block perpendicular to the vibration direction.

Preferably, the mass block includes a fixing surface fixed to the elastic member, and the second fixing portion and the third fixing portion are respectively fixed to both ends of the fixing surface in a vertical vibration direction.

Compared with the related art, the utility model provides a linear vibration motor which comprises a shell with an accommodating space, and a vibration assembly and a stator assembly which are accommodated in the accommodating space, wherein the vibration assembly comprises a mass block accommodated in the accommodating space, magnetic steel fixed on the mass block and an elastic piece for driving the mass block to reciprocate; the elastic member includes a first fixed portion fixed to the housing, a first elastic portion extending from one end of the first fixed portion toward the mass, a second fixed portion extending from the first elastic portion to be fixed to the mass, a second elastic portion extending from the other end of the first elastic portion toward the mass, and a third fixed portion extending from the second elastic portion to be fixed to the mass; the first elastic part and the second elastic part are positioned at two sides of the central axis along the first central axis of the first fixing part and are of an asymmetric structure. Through setting up first elastic component and second elastic component to be asymmetric structure, can effectively avoid because of the fracture wind direction that stress concentration brought on the elastic component, show the reliability that promotes linear vibration motor. And through the adjustment of the asymmetric structures of the first elastic part and the second elastic part, the adjustment of F0 and the mode can be realized, and the design space of the linear vibration motor is increased.

[ description of the drawings ]

FIG. 1 is a perspective view of a linear vibration motor of the present utility model;

FIG. 2 is an exploded view of a linear vibration motor of the present utility model;

FIG. 3 is a cross-sectional view taken along line O-O in FIG. 1;

FIG. 4 is a perspective view of a portion of the structure of a linear vibration motor according to the present utility model;

fig. 5 is a perspective view showing a part of the structure of the linear vibration motor of the present utility model.

[ detailed description ] of the utility model

The technical scheme of the utility model is clearly and completely described below with reference to the accompanying drawings and the specific embodiments.

As shown in fig. 1 to 2, the present utility model provides a linear vibration motor 100 including a housing 1 having a receiving space 10, and a vibration assembly 2 and a stator assembly 3 received in the receiving space 10.

The housing 1 includes an upper case 11 having a receiving space, and a lower cover 12 fixed to the upper case 11, wherein the receiving space 10 is defined by the upper case 11 and the lower cover 12.

As shown in fig. 2, the vibration assembly 2 includes a mass block 21 accommodated in the accommodating space 10, a plurality of magnetic steels 22 fixed on the mass block 21, an elastic member 23 driving the mass block 21 to reciprocate, and a pole core 24 fixed on the mass block 21; specifically, the mass block 21 is provided with a through hole 211 penetrating through the mass block, a plurality of magnetic steels 22 are accommodated in the through hole 211, and the pole core 24 is covered above the magnetic steels 22 and covers the through hole 211. In this embodiment, the number of the magnetic steels 22 is three.

The stator assembly 3 comprises an iron core 31, a coil 32 wound on the outer side of the iron core 31 and a flexible circuit board 33 electrically connecting the coil 32 with an external circuit, wherein the flexible circuit board 33 is fixed on the lower cover 12, and the coil 32 is fixed on one side of the flexible circuit board 33 facing the mass block 21 and is arranged opposite to the magnetic steel 22 at intervals; the coil 3 is opposite to the magnetic steel 22 and generates interaction force to drive the mass block 21 and the magnetic steel 22 to vibrate reciprocally.

As shown in fig. 2 to 4, the elastic member 23 includes a first fixing portion 231 fixed to the upper case 11, a first elastic portion 232 extending from one end of the first fixing portion 231 toward the mass 21, a second fixing portion 233 extending from the first elastic portion 232 to be fixed to the mass 21, a second elastic portion 234 extending from the other end of the first elastic portion 232 toward the mass 21, and a third fixing portion 235 extending from the second elastic portion 234 to be fixed to the mass 21; along a first central axis AA 'of the first fixing portion 231, the first elastic portion 232 and the second elastic portion 234 are located at two sides of the first central axis AA' and have an asymmetric structure. It is understood that the first central axis AA' is parallel to the vibration direction of the linear vibration motor 100. Specifically, the mass 21 includes a fixing surface 212 fixed to the elastic member 23, and the second fixing portion 233 and the third fixing portion 235 are respectively fixed to two ends of the fixing surface 212 along the vertical vibration direction.

In this embodiment, the number of the elastic members 23 is two, the two elastic members 23 are respectively disposed on two sides of the mass 21 along the vibration direction, and the two elastic members 23 are in a rotationally symmetrical structure along a second central axis BB' of the mass 21 perpendicular to the vibration direction.

As shown in fig. 4 to 5, the first elastic portion 232 includes a first elastic arm 2321 extending from the first fixing portion 231, a first bent portion 2322 extending from the first elastic arm 2321, a second elastic arm 2323 extending from the first bent portion 2322, a second bent portion 2324 extending from the second elastic arm 2323, a third elastic arm 2325 extending from the second bent portion 2324, a third bent portion 2326 extending from the third elastic arm 2325, and a fourth elastic arm 2327 extending from the third bent portion 2326 to be connected to the second fixing portion 233.

The extending direction of the second elastic portion 234 is a straight line, that is, the second elastic portion 234 is a straight elastic sheet, which does not have a bending structure.

The extending direction of the first arm 2321 intersects with the extending direction of the second arm 2323, and specifically, an included angle between the first arm 2321 and the second arm 2323 is an obtuse angle. The extending direction of the third arm 2325 intersects with the extending direction of the second arm 2323, specifically, an included angle between the second arm 2323 and the third arm 2325 is a right angle. The extending direction of the fourth arm 2327 intersects with the extending direction of the third arm 2325, and an included angle between the third arm 2325 and the fourth arm 2327 is an obtuse angle. Further, the first bending portion 2322, the second bending portion 2324 and the third bending portion 2326 are all arc-shaped.

In this embodiment, the opening formed between the first arm 2321 and the second arm 2323 is opposite in orientation to the opening formed between the second arm 2323 and the third arm 2325. The opening formed between the second arm 2323 and the third arm 2325 is opposite in orientation to the opening formed between the third arm 2325 and the fourth arm 2327.

While the utility model has been described with respect to the above embodiments, it should be noted that modifications can be made by those skilled in the art without departing from the inventive concept, and these are all within the scope of the utility model.

Claims

1. The linear vibration motor comprises a shell with an accommodating space, and a vibration assembly and a stator assembly which are accommodated in the accommodating space, wherein the vibration assembly comprises a mass block accommodated in the accommodating space, magnetic steel fixed on the mass block and an elastic piece for driving the mass block to reciprocate; the stator assembly comprises a coil which is arranged opposite to the magnetic steel, and is characterized in that the elastic piece comprises a first fixing part fixed on the shell, a first elastic part extending from one end of the first fixing part towards the mass block, a second fixing part extending from the first elastic part to be fixed on the mass block, a second elastic part extending from the other end of the first elastic part towards the mass block and a third fixing part extending from the second elastic part to be fixed on the mass block; the first elastic part and the second elastic part are positioned at two sides of the first central axis along the first central axis of the first fixing part and are of an asymmetric structure.

2. The linear vibration motor according to claim 1, wherein the first elastic portion includes a first elastic arm extending from the first fixing portion, a second elastic arm connected to the second fixing portion, and a first bending portion connecting the first elastic arm and the second elastic arm, an extending direction of the first elastic arm intersecting an extending direction of the second elastic arm.

3. The linear vibration motor according to claim 2, wherein the first elastic portion further includes a second bent portion extending from the second elastic arm and a third elastic arm extending from the second bent portion, the third elastic arm being connected to the second fixing portion, an extending direction of the third elastic arm intersecting an extending direction of the second elastic arm.

4. A linear vibration motor according to claim 3, wherein the first elastic portion further includes a third bent portion extending from the third elastic arm and a fourth elastic arm extending from the third bent portion to be connected to the second fixing portion, an extending direction of the fourth elastic arm intersecting an extending direction of the third elastic arm.

5. The linear vibration motor of claim 4, wherein the first bend, the second bend, and the third bend are each arcuate.

6. The linear vibration motor according to claim 1, wherein the extending direction of the second elastic portion is a straight line.

7. The linear vibration motor of claim 4, wherein an angle between the first spring arm and the second spring arm is an obtuse angle, and an angle between the third spring arm and the fourth spring arm is an obtuse angle.

8. A linear vibration motor according to claim 3, wherein the angle between the second spring arm and the third spring arm is a right angle.

9. The linear vibration motor according to claim 1, wherein the number of the elastic members is two, the two elastic members are respectively provided on both sides of the mass block in the vibration direction, and the two elastic members are in a rotationally symmetrical structure along a second center axis of the mass block perpendicular to the vibration direction.

10. The linear vibration motor according to claim 1, wherein the mass includes a fixing surface fixed to the elastic member, and the second fixing portion and the third fixing portion are respectively fixed to both ends of the fixing surface in a vertical vibration direction.