Linear vibration motor

Abstract

The present invention provides a linear vibration motor, which includes a vibration unit disposed in a housing and an elastic member that is fixed to the vibration unit and suspends the vibration unit in the housing. The vibration unit includes a mass block fixedly connected to the elastic member, and the elastic member includes an elastic portion connecting two fixed portions. The elastic portion of the present invention includes two elastic arms spaced apart in a first direction. The mass block includes a main body portion connected to the elastic member. The main body portion includes a side surface connected to the elastic member. The mass block further includes protruding portions respectively protruding from the side surface along the vibration direction towards the housing. The elastic portion and the protruding portions are relatively spaced apart in a second direction perpendicular to the vibration direction and the first direction, effectively avoiding the problems in the prior art that the structural size is large and plastic deformation is more likely to occur due to the fact that the elastic member has only a single elastic arm. At the same time, the volume of the mass block is effectively increased, and the performance of the linear vibration motor is further improved.

Description

Technical Field

[0001] The present invention relates to the field of linear motors, and more particularly to a linear vibration motor. Background Art

[0002] The related linear vibration motor includes a housing having a receiving space, a vibration unit located in the housing, elastic members respectively fixed on both sides of the vibration unit and fixing and suspending it in the receiving space, and a coil fixed to the base. The magnetic field generated by the coil interacts with the magnetic field generated by the vibration unit, so as to drive the vibration unit to perform a reciprocating linear motion to generate vibration.

[0003] In the prior art, the elastic member structure includes a single elastic arm. In order to meet the performance requirements of a specific resonance frequency required by the linear vibration motor, the overall structural size of the elastic member is large, and it is also more likely to undergo plastic deformation. At the same time, when the receiving space of the linear vibration motor is certain, due to the existence of the large-sized elastic member structure, it occupies more receiving space in the linear vibration motor, limits the volume of the mass block in the vibration unit, and then affects the vibration performance of the linear vibration motor.

[0004] Therefore, it is necessary to provide a new linear vibration motor to solve the above problems. Summary of the Invention

[0005] The present invention provides a linear vibration motor, including a housing having a receiving space, a vibration unit disposed in the housing, a coil disposed at a relative interval from the vibration unit in a first direction perpendicular to the vibration direction, and an elastic member fixed to the vibration unit and suspending the vibration unit in the housing. The housing includes a cover plate spaced from the vibration unit, a base fixing the coil, and a side wall connecting the cover plate and the base. The vibration unit includes a mass block fixedly connected to the elastic member and a magnetic steel unit embedded in the mass block. The elastic member includes a first fixing portion fixed to the side wall, a second fixing portion fixed to the mass block, and an elastic portion connecting the first fixing portion and the second fixing portion. The elastic portion includes two elastic arms spaced apart in the first direction. The mass block includes a main body portion fixedly connected to the second fixing portion. The main body portion includes a side surface connected to the second fixing portion. The mass block further includes a convex portion protruding and extending from the side surface in the vibration direction toward the side wall. The elastic portion and the convex portion are disposed at a relative interval in a second direction perpendicular to the vibration direction and the first direction.

[0006] Preferably, at least a part of the orthographic projection of the elastic arm in the second direction falls within the convex portion.

[0007] Preferably, the elastic arms are V-shaped. The elastic arms include a first elastic arm connected to the first fixing portion, a second elastic arm connected to the second fixing portion, and a bending portion connecting the first elastic arm and the second elastic arm. The opening formed by the first elastic arm and the second elastic arm faces away from the protruding portion along the second direction.

[0008] Preferably, the side surface includes a first side surface connected to the second fixing portion and a second side surface spaced from the elastic portion along the vibration direction. The distance between the second side surface and the side wall along the vibration direction is greater than the distance between the first side surface and the side wall along the vibration direction.

[0009] Preferably, the distance between the second side surface and the side wall along the vibration direction gradually increases in the direction from the first side surface towards the protruding portion.

[0010] Preferably, the first fixing portion and the second fixing portion are spaced apart from each other along the vibration direction.

[0011] Preferably, there are two elastic members. The two elastic members are arranged on opposite sides of the vibration unit along the vibration direction. There are two protruding portions. The two protruding portions are arranged on opposite sides of the main body portion along the vibration direction.

[0012] Preferably, the two elastic members are centrosymmetrically arranged along the central axis of the mass block parallel to the second direction, and the two protruding portions are centrosymmetrically arranged along the central axis of the mass block parallel to the second direction. The protruding portion and the main body portion are integrally formed.

[0013] Compared with the prior art, in the linear vibration motor provided by the present invention, the elastic member includes a first fixing portion fixed to the side wall, a second fixing portion fixed to the mass block, and an elastic portion connecting the first fixing portion and the second fixing portion. The elastic portion includes two elastic arms spaced apart along the first direction. Without changing the stiffness and stress of the elastic member, the overall structural size of the elastic member is effectively reduced. The mass block further includes protruding portions respectively protruding and extending from the side surface towards the side wall along the vibration direction. The elastic portion and the protruding portion are spaced apart from each other along the second direction perpendicular to the vibration direction and the first direction. Since the structural size of the elastic member reduces the space occupation, the volume of the mass block is increased, thereby achieving a larger vibration amount and further improving the vibration performance of the linear vibration motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a three-dimensional structural schematic diagram of the linear vibration motor in the embodiment of the present invention;

[0015] Figure 2 Exploded view of the linear vibration motor in Figure 1 ;

[0016] Figure 3 Is the sectional view along line A-A in Figure 1 ;

[0017] Figure 4 Is the schematic diagram of the combined structure of the mass block, elastic member and side wall in the linear vibration motor of Figure 1 ;

[0018] Figure 5 Is the schematic diagram of the structure of the elastic member of the linear vibration motor of Figure 1 ;

[0019] Figure 6 Is the top view of the combined structure of the mass block, elastic member and base in the linear vibration motor of Figure 1 ;

[0020] Figure 7 Is the front view of the combined structure of the mass block and elastic member in the linear vibration motor of Figure 1 . Detailed implementation manners

[0021] To further illustrate the embodiments, the present invention provides accompanying drawings. These accompanying drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principle of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0022] The present invention will be further described below in conjunction with the accompanying drawings and implementation manners.

[0023] Refer to Figure 1 , Figure 2 and Figure 3 , this embodiment provides a linear vibration motor 100, which includes a housing 200 having a receiving space 201, a vibration unit 30 disposed in the housing 200, a coil 40 disposed at a relatively spaced interval from the vibration unit 30 in a first direction 01 perpendicular to the vibration direction 03, and an elastic member 70 fixed to the vibration unit 30 and suspending the vibration unit 30 in the housing 200. The housing 200 includes a cover plate 210 spaced from the vibration unit 30, a base 220 for fixing the coil 40, and a side wall 230 connecting the cover plate 210 and the base 220, and the three together enclose the receiving space 201. In this embodiment, the cover plate 210 and the side wall 230 are square.

[0024] Refer to Figure 2 and Figure 3, the vibration unit 30 includes a mass block 310 having a middle through hole 301 and a magnet unit 320 assembled in the through hole 301.

[0025] See Figure 2 and Figure 3 , the magnetic field generated by the coil 40 interacts with the magnetic field generated by the magnet unit 320, thereby driving the vibration unit 30 to perform a reciprocating linear motion to generate vibration. The linear vibration motor 100 is further provided with an FPC board 60 for electrically connecting to the coil 40, and the coil 40 is connected to an external circuit through the FPC board 60 to realize the input of an electrical signal.

[0026] See Figure 4 , Figure 5 and Figure 6 , the elastic member 70 structure provided by the present invention includes a first fixing portion 710 fixed to the side wall 230, a second fixing portion 720 fixed to the mass block 310, and an elastic portion 730 connecting the first fixing portion 710 and the second fixing portion 720. The elastic portion 730 includes two elastic arms 731 spaced apart along the first direction 01. The elastic member 70 proposed by the present invention has two elastic arms 731. Compared with the elastic member with only a single elastic arm in the prior art, while ensuring that the overall stiffness and stress of the elastic member 70 remain unchanged, the structural size of the elastic member 70 is reduced, thereby providing more design space for the mass block 310. The number of the elastic members 70 of the present invention is two, and they are arranged on opposite sides of the vibration unit 30 along the vibration direction 03. The elastic members 70 drive the vibration unit 30 to reciprocate along the vibration direction 03.

[0027] See Figure 2 , Figure 4 and Figure 6 , in this embodiment, the mass block 310 includes a main body portion 311 located at the central position. The main body portion 311 includes a side surface 312 connected to the elastic member 70. The mass block 310 further includes protruding portions 313 respectively protruding and extending from the side surface 312 along the vibration direction 03 towards the side wall 230 of the housing 200. The protruding portions 313 of the mass block 310 and the elastic portion 730 of the elastic member 70 are relatively spaced apart along a second direction 02 perpendicular to the vibration direction 03 and the first direction 01. Since the overall size of the elastic member 70 is reduced, the accommodation space of the elastic member 70 in the linear vibration motor 100 is reduced, the volume of the mass block 310 is increased, a larger vibration amount is achieved, and the vibration performance of the linear vibration motor 100 is effectively improved.

[0028] There are two protrusions 313. The two protrusions 313 are centrally symmetrically arranged along the central axis of the mass 310 parallel to the second direction 02, and the protrusions 313 and the main body 311 are integrally formed. Therefore, the structure of the mass 310 proposed by the present invention has a larger volume compared with the mass in the prior art, further improving the performance of the linear vibration motor 100.

[0029] See Figure 4 、 Figure 5 and Figure 6 , the side surface 312 of the mass 310 includes a first side surface 3121 connected to the second fixing portion 720 and a second side surface 3122 spaced from the elastic portion 730 along the vibration direction 03. The distance between the second side surface 3122 and the side wall 230 of the housing 200 along the vibration direction 03 is greater than the distance between the first side surface 3122 and the side wall 230 along the vibration direction 03. The distance between the second side surface 3122 and the side wall 230 along the vibration direction 03 gradually increases in the direction from the first side surface 3121 towards the protrusion. In this embodiment, the elastic force arm 731 is V-shaped. The elastic force arm 731 includes a first elastic force arm 7311 connected to the first fixing portion 710, a second elastic force arm 7312 connected to the second fixing portion 720, and a bending portion 733 connecting the first elastic force arm 7311 and the second elastic force arm 7312. The opening formed by the first elastic force arm 7311 and the second elastic force arm 7312 faces away from the protrusion 313 along the second direction 02. See Figure 5 and Figure 7 , the orthographic projection of the elastic force arm 731 along the second direction 02 at least partially falls within the protrusion 313.

[0030] See Figure 2 , the linear vibration motor 100 further includes two limiting bosses 80 located on the second side surface 3122 of the mass 310. The arrangement of the limiting bosses 80 can prevent the elastic force arm 731 of the elastic member 70 from breaking when the amplitude of the vibration unit 30 is too large, so that the linear vibration motor 100 cannot work, improving its stability and reliability. Among them, in this embodiment, the limiting bosses 80 are preferably made of damping materials such as rubber.

[0031] Compared with the prior art, the elastic member 70 in the linear vibration motor 100 provided by the present invention includes a first fixing portion 710 fixed to the side wall 230, a second fixing portion 720 fixed to the mass block 310, and an elastic portion 730 connecting the first fixing portion 710 and the second fixing portion 720. The elastic portion 730 includes two elastic arms 731 spaced along the first direction 01. Without changing the stiffness and stress of the elastic member 70, the overall structural size of the elastic member 70 is effectively reduced. The mass block 310 further includes protruding portions 313 respectively protruding from the side surface 312 toward the side wall 230 along the vibration direction 03. The elastic portion 730 and the protruding portions 313 are relatively spaced along a second direction 02 perpendicular to the vibration direction 03 and the first direction 01. Since the structural size of the elastic member 70 reduces the space occupation, the volume of the mass block 310 is increased, thereby achieving a larger vibration amount and further improving the vibration performance of the linear vibration motor 100.

[0032] The above are only the embodiments of the present invention. It should be noted here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these all fall within the protection scope of the present invention.

Claims

1. A linear vibration motor, comprising a housing having a receiving space, a vibration unit disposed in the housing, a coil disposed opposite and spaced apart from the vibration unit in a first direction perpendicular to the vibration direction, and an elastic member fixed to the vibration unit and suspending the vibration unit in the housing. The number of the elastic members is two, and the two elastic members are disposed on opposite sides of the vibration unit along the vibration direction. The housing includes a cover plate spaced apart from the vibration unit, a base fixing the coil, and a side wall connecting the cover plate and the base. The vibration unit includes a mass block fixedly connected to the elastic member and a magnet unit embedded in the mass block, characterized in that, The elastic member includes a first fixing portion fixed to the side wall, a second fixing portion fixed to the mass block, and an elastic portion connecting the first fixing portion and the second fixing portion. The elastic portion includes two elastic arms spaced along the first direction, and the elastic arms are V-shaped. The mass block includes a main body portion fixedly connected to the second fixing portion. The main body portion includes a side surface connected to the second fixing portion. The mass block further includes a convex portion protruding and extending from the side surface toward the side wall along the vibration direction. The elastic portion and the convex portion are relatively spaced along a second direction perpendicular to the vibration direction and the first direction. The elastic arm includes a first elastic arm connected to the first fixing portion, a second elastic arm connected to the second fixing portion, and a bending portion connecting the first elastic arm and the second elastic arm. The opening formed by the first elastic arm and the second elastic arm faces away from the convex portion along the second direction.

2. The vibration motor according to claim 1, wherein The positive projection of the elastic arm along the second direction at least partially falls within the convex portion.

3. The vibrating motor according to claim 1, wherein, The side surface includes a first side surface connected to the second fixing portion and a second side surface spaced from the elastic portion along the vibration direction. The distance between the second side surface and the side wall along the vibration direction is greater than the distance between the first side surface and the side wall along the vibration direction.

4. The vibration motor according to claim 3, wherein The distance between the second side surface and the side wall along the vibration direction gradually increases in the direction from the first side surface toward the convex portion.

5. The vibration motor according to claim 1, wherein, The first fixing portion and the second fixing portion are relatively spaced along the vibration direction.

6. The vibration motor according to claim 1, wherein The number of the convex portions is two, and the two convex portions are arranged on opposite sides of the main body portion along the vibration direction.

7. The vibration motor according to claim 6, wherein, The two elastic members are centrosymmetrically arranged along the central axis of the mass block parallel to the second direction, the two convex portions are centrosymmetrically arranged along the central axis of the mass block parallel to the second direction, and the convex portion and the main body portion are integrally formed.

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