CN202334238U

CN202334238U - Linear vibration motor

Info

Publication number: CN202334238U
Application number: CN2011204791066U
Authority: CN
Inventors: 杨华新; 杨鑫峰; 夏伟
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2011-11-26
Filing date: 2011-11-26
Publication date: 2012-07-11
Anticipated expiration: 2021-11-26

Abstract

The utility model discloses a linear vibration motor which comprises an external frame, a vibration unit and an electromagnet, wherein the external frame is composed of a top surface, a bottom surface and side surfaces; the vibration unit comprises a permanent magnet and is suspended inside the external frame through an elastic support piece; the electromagnet is installed in the external frame and is used for driving the vibration unit to produce vibration; the vibration unit and the electromagnet are arranged on one same plane parallel to the bottom surface of the external frame; the vibration direction of the vibration unit is parallel to the bottom surface of the external frame; and an elastic buffer piece is arranged on the elastic support piece or/and the side surfaces of the external frame. According to the linear vibration motor provided by the utility model, the service life of the elastic support piece is prolonged, and noise is reduced, so that the performance of the linear vibration motor is improved.

Description

Linear vibration motor

Technical Field

The utility model relates to a motor field, concretely relates to linear vibration motor.

Background

The linear vibration motor includes a vibration unit, an elastic support member supporting and fixing the vibration unit, and an outer frame accommodating the fixed vibration unit and the elastic support member. The quality of the vibration unit can influence the performances of the linear vibration motor such as the resonance frequency f0, the Q value, the vibration sense and the like of the linear vibration motor, and the elastic supporting piece generates elastic deformation in the vibration process of the vibration unit and follows the vibration of the vibration unit. In the prior art, the elastic supporting part is easy to collide with an external frame or the elastic supporting part per se in the vibration process, and particularly under the condition of large voltage impact, the elastic supporting part is easy to damage and can generate noise. Therefore, there is a need for an improved linear vibration motor of the above-described structure to avoid the above-described drawbacks.

Disclosure of Invention

The utility model discloses the technical problem that will solve is: a linear vibration motor is provided, which can prolong the service life of an elastic support member, reduce noise and improve the acoustic performance of the linear vibration motor.

In order to solve the technical problem, the technical scheme of the utility model is that: a linear vibration motor comprising:

an outer frame consisting of a top surface, a bottom surface and side surfaces;

a vibration unit including a permanent magnet, the vibration unit being suspended inside the outer frame by an elastic support;

an electromagnet installed in the outer frame for driving the vibration unit to generate vibration; wherein,

the vibration unit and the electromagnet are arranged on the same plane parallel to the bottom surface of the external frame, and the vibration direction of the vibration unit is parallel to the bottom surface of the external frame;

and elastic buffer parts are arranged on the elastic supporting parts or/and the side surfaces of the external frame.

In addition, preferably, an elastic buffer member is disposed on a side of the elastic supporting member close to the side surface of the external frame, and the elastic buffer member is disposed at a position where the elastic supporting member undergoes maximum deformation displacement.

In addition, preferably, an elastic buffer member is disposed on a side surface of the outer frame, the side surface being close to the elastic supporting member, and the elastic buffer member is disposed at a position opposite to a position where the elastic supporting member undergoes maximum deformation displacement.

In addition, preferably, elastic buffer parts are arranged on one side of the elastic supporting part close to the side surface of the external frame and on the positions of the side surface of the external frame close to the elastic supporting part, and the elastic buffer parts are arranged at positions corresponding to the positions where the elastic supporting part generates the maximum deformation displacement.

In addition, the preferable scheme is that the elastic supporting part is a U-shaped structure formed by two supporting arms, an elastic buffer part is arranged on the inner side surface of at least one supporting arm, and the elastic buffer part is arranged at a position corresponding to the position where the elastic supporting part generates the maximum deformation displacement.

In addition, the preferred scheme is that the elastic buffer part is an adhesive layer, PU or a silicon rubber sheet.

After the technical scheme is adopted, the beneficial effects of the utility model are that: compared with the traditional structure, the utility model discloses be equipped with elastic buffer spare on elastic support spare or/and outside frame side, wherein, elastic buffer spare can adopt to have elasticity and the softer material of texture like the glue film, PU or silicon rubber piece, the setting takes place the corresponding position in maximum deformation displacement position with elastic support spare, the aforesaid design has been adopted, can avoid effectively taking place rigid collision between elastic support spare and the outside frame side or elastic support spare self, elastic support spare's life has been prolonged, the noise has been reduced, thereby linear vibrating motor's performance has been improved.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a perspective exploded view of a linear vibration motor according to the present invention.

Fig. 2 is a schematic diagram of the operation of the linear vibration motor of the present invention.

Fig. 3 is a plan view of the elastic support member and the cover in the linear vibration motor of the present invention.

Fig. 4 is a schematic structural view of a modified embodiment of the linear vibration motor of the present invention.

Fig. 5 is a schematic structural view of another modified version of the linear vibration motor of the present invention.

In the figure: 11. the magnetic suspension type magnetic suspension device comprises a top surface, a bottom surface, a side surface, a circuit board, a magnet, a coil, an iron core, a permanent magnet, a magnetizer, a mass block, an elastic supporting piece and an elastic buffer piece, wherein the top surface is 12, the bottom surface is 13, the side surface is 14, the circuit board is 2, the magnet is 21, the iron core is 22, the permanent magnet is 31, the magnetizer.

Detailed Description

As shown in fig. 1 to 3, the linear vibration motor includes an external frame including a top surface 11, a bottom surface 12, and side surfaces 13, wherein the bottom surface 12 and the side surfaces 13 form a groove-shaped case, the top surface 11 is a cover body covering the groove-shaped case, and a circuit board 14 is further coupled to an outer surface of the bottom surface 12, and the circuit board 14 is used to electrically connect an internal circuit of the linear vibration motor and an external electronic circuit.

The outer frame accommodates a vibration unit and an electromagnet 2 for driving the vibration unit to vibrate. The electromagnet 2 is fixed in the external frame, and comprises an iron core 22 and a coil 21 wound on the iron core 22, and the coil 21 is electrically connected with the circuit board 14. The vibration unit is suspended inside the external frame through the elastic support piece 5, the vibration unit and the electromagnet 2 are arranged on the same plane parallel to the top surface 11 and the bottom surface 12 of the external frame, the vibration direction of the vibration unit is parallel to the top surface 11 and the bottom surface 12 of the external frame, and the elastic support piece 5 provides elastic deformation in the vibration process of the vibration unit. The linear vibration motor reduces the thickness of the product and realizes the thinning of the product.

In this implementation, the vibration unit includes a permanent magnet 31, a magnetizer 32, and a mass block 4, which are combined in sequence. The permanent magnet 31 is magnetized in a direction parallel to the bottom surface of the outer frame, and the magnetization direction is perpendicular to the extending direction of the electromagnet 2. The magnetic conductor 32 is combined with one magnetic pole of the permanent magnet 31 and has two end portions near both ends of the electromagnet 2.

The linear vibration motor operates as follows: the magnetizer 32 combined with one magnetic pole of the permanent magnet 31 is magnetized by the permanent magnet 31, and the two end magnetic poles of the magnetizer 32 are the same. After the coil 21 is connected with an electric signal through the circuit board 14, two ends of the electromagnet 2 present a certain polarity, and act on the end portions of two same magnetic poles of the magnetizer 32, according to the principle that like poles repel and unlike poles attract, and because the electromagnet 2 is fixed relative to the external frame, the permanent magnet 31 is acted by an acting force to drive the vibration unit to move under the support of the elastic support member 5. When the electric signal is an alternating current signal, the polarities of the two ends of the electromagnet 2 are changed alternately, and the direction of the acting force applied to the permanent magnet 31 is changed alternately, so that the vibration unit vibrates reciprocally to generate vibration.

In this implementation, the elastic buffer 6 is disposed on the side of the elastic supporting member 5 close to the side 13 of the external frame, so as to prevent the elastic supporting member 5 from directly colliding with the side 13 of the external frame during the vibration process of the vibration unit driven by the elastic supporting member. Since the part of the elastic supporting member 5 that has the maximum deformation and displacement during the vibration process is likely to collide with the external frame, the elastic buffering member 6 should be disposed at the part of the elastic supporting member 5 that has the maximum deformation and displacement. The elastic buffer member 6 can be made of PU (polyurethane), silicone rubber sheet or other materials with elasticity, preferably, the elastic buffer member 6 is a glue layer formed by gluing, and the operation is simple and convenient.

The elastic buffer 6 may be further modified, and as shown in fig. 4, the elastic buffer 6 is disposed at a position on the outer frame side 13 close to the elastic supporting member 5, and the elastic buffer 6 is disposed at a position opposite to the position where the elastic supporting member 5 undergoes the maximum deformation displacement, so as to prevent the elastic supporting member 5 from directly colliding with the outer frame side 13. The two solutions described above can be combined together, and at the same time, the elastic buffer 6 is provided on the elastic support 5 and the outer frame side 13, which is more effective.

Fig. 5 is a schematic structural view of another modified embodiment, in which the elastic supporting member 5 is a U-shaped structure formed by two support arms, an elastic buffer member 6 is disposed on an inner side surface of at least one of the support arms, and the elastic buffer member 6 is disposed at a position corresponding to a position where the elastic supporting member 5 undergoes maximum deformation displacement. In this embodiment, the elastic buffer 6 is provided only on the inner side surface of one of the arms.

The design of the elastic buffer part 6 can avoid hard collision between the external frame and the elastic support part or the elastic support part, prolong the service life of the elastic support part, reduce noise and improve the performance of the linear vibration motor.

Given the above teachings of the present invention, those skilled in the art may make numerous modifications and variations on the above-described embodiments, all of which fall within the scope of the invention, it being understood that the above detailed description is intended to illustrate and explain the principles of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A linear vibration motor comprising:

an outer frame consisting of a top surface, a bottom surface and side surfaces;

an electromagnet installed in the outer frame for driving the vibration unit to generate vibration; the method is characterized in that:

2. The linear vibration motor of claim 1, wherein: one side of the elastic supporting piece, which is close to the side face of the external frame, is provided with an elastic buffering piece, and the elastic buffering piece is arranged at the position where the elastic supporting piece generates the maximum deformation displacement.

3. The linear vibration motor of claim 1, wherein: and an elastic buffer part is arranged at the position of the side surface of the external frame, which is close to the elastic supporting part, and the elastic buffer part is arranged at the position opposite to the position where the elastic supporting part generates the maximum deformation displacement.

4. The linear vibration motor of claim 1, wherein: the elastic supporting piece is close to one side of the side face of the outer frame and the side face of the outer frame is close to the elastic supporting piece, elastic buffering pieces are arranged at the positions of the elastic supporting piece, and the elastic buffering pieces are arranged at the positions corresponding to the positions where the elastic supporting piece generates the maximum deformation displacement.

5. The linear vibration motor of claim 1, wherein: the elastic support part is of a U-shaped structure consisting of two support arms, an elastic buffer part is arranged on the inner side surface of at least one support arm, and the elastic buffer part is arranged at a position corresponding to the position where the elastic support part generates the maximum deformation displacement.

6. The linear vibration motor according to any one of claims 1 to 5, wherein: the elastic buffer part is an adhesive layer, PU or a silicon rubber sheet.