Linear Vibration Motor

Abstract

To provide a highly reliable linear vibration motor. [Solution] The linear vibration motor includes a housing, a vibration assembly, and a stator assembly, and the vibration assembly includes a mass block, a magnetic steel fixed to the mass block, and an elastic member that drives the mass block to reciprocate. The elastic member includes a first fixed part fixed to the housing, a first elastic part extending from one end of the first fixed part to the mass block, a second fixed part extending from the first elastic part until it is fixed to the mass block, a second elastic part extending from the other end of the first elastic part to the mass block, and a third fixed part extending from the second elastic part until it is fixed to the mass block. The first elastic part and the second elastic part are located on both sides of a first central axis of the first fixed part and have an asymmetric structure.

Description

[Technical Field]

[0001] The present invention relates to a motor, and more particularly to a linear vibration motor applied in the field of mobile electronic products. [Background technology]

[0002] With the development of electronic technology, portable consumer electronic products, such as mobile phones, portable game consoles, navigation devices, portable multimedia entertainment devices, etc., are increasingly popular, and these electronic products generally use linear vibration motors to provide system feedback, such as incoming call notification, information notification, navigation notification, and vibration feedback for game consoles.

[0003] A linear vibration motor of the related art includes a housing having an accommodation space, a vibration assembly located in the accommodation space, and a stator assembly fixed to the housing. The stator assembly includes a coil, and the vibration assembly includes a mass block, magnetic steel, and an elastic member that supports the mass block within the accommodation space. The coil interacts with the magnetic steel to generate a driving force that drives the reciprocating vibration of the vibration assembly, thereby providing a vibration sensation.

[0004] However, in the structure of the linear vibration motor in the related art, the elastic member includes two symmetrically installed elastic arms, and the elastic arms in the related art have a structure that extends in a straight line. During the vibration process, stress is easily concentrated in the elastic arms, which can cause breakage, resulting in low reliability of the linear vibration motor.

[0005] Therefore, there is a need to provide a new linear vibration motor to solve the above problems. Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above problems, the present invention provides a highly reliable linear vibration motor. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a linear vibration motor including a housing having an accommodation space, and a vibration assembly and a stator assembly housed in the accommodation space, wherein the vibration assembly includes a mass block housed in the accommodation space, a magnetic steel member fixed to the mass block, and an elastic member that drives the mass block to reciprocate, and the stator assembly includes a coil disposed opposite the magnetic steel member, 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 to the mass block, a second fixed portion extending from the first elastic portion until being fixed to the mass block, a second elastic portion extending from the other end of the first fixed portion to the mass block, and a third fixed portion extending from the second elastic portion until being fixed to the mass block, the first elastic portion and the second elastic portion being located on both sides of a first central axis of the first fixed portion and having an asymmetric structure; The first elastic portion includes a first elastic arm extending from the first fixed portion; Through the third elastic arm and the fourth elastic arm a second elastic arm connected to the second fixed portion and a first bent portion connecting the first elastic arm and the second elastic arm, wherein an extending direction of the first elastic arm intersects with an extending direction of the second elastic arm; The first elastic portion includes a second bent portion extending from the second elastic arm and a second bent portion extending from the second bent portion. The aforementioned and a third elastic arm, via the fourth elastic arm the third elastic arm is connected to the second fixed portion, and an extending direction of the third elastic arm intersects with an extending direction of the second elastic arm; The second elastic portion extends in a straight line. The angle between the second elastic arm and the third elastic arm is a right angle. the law of nature, 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 fixed portion, and an extending direction of the fourth elastic arm intersects with an extending direction of the third elastic arm. It is characterized by:

[0011] Preferably, the first bent portion, the second bent portion and the third bent portion all have an arc shape.

[0013] Preferably, the angle between the first elastic arm and the second elastic arm is an obtuse angle, and the angle between the third elastic arm and the fourth elastic arm is an obtuse angle.

[0015] Preferably, the number of the elastic members is two, the two elastic members are respectively installed on both sides of the mass block along the vibration direction, and have a rotationally symmetric structure with respect to a second central axis perpendicular to the vibration direction of the mass block.

[0016] Preferably, the mass block includes a fixed surface that is fixed to the elastic member, and the second fixed portion and the third fixed portion are fixed to both ends of the fixed surface along a direction perpendicular to the vibration direction. [Effects of the Invention]

[0017] Compared to the related art, the linear vibration motor of the present invention includes a housing having an accommodation space, a vibration assembly and a stator assembly accommodated in the accommodation space. The vibration assembly includes a mass block accommodated in the accommodation space, a magnetic steel member fixed to the mass block, and an elastic member 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 to the mass block, a second fixed portion extending from the first elastic portion to be fixed to the mass block, a second elastic portion extending from the other end of the first elastic portion to the mass block, and a third fixed portion extending from the second elastic portion to be fixed to the mass block. The first elastic portion and the second elastic portion are located on both sides of a first central axis of the first fixed portion and have an asymmetric structure. The asymmetric structure of the first elastic portion and the second elastic portion effectively avoids the risk of fracture of the elastic member due to stress concentration, significantly improving the reliability of the linear vibration motor. Furthermore, by adjusting the asymmetric structure of the first elastic part and the second elastic part, F0 and mode can be adjusted, improving the design margin of the linear vibration motor. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a perspective view of a linear vibration motor according to the present invention; [Figure 2] 1 is an exploded perspective view of a linear vibration motor according to the present invention. [Figure 3] FIG. 2 is a cross-sectional view taken along line OO in FIG. [Figure 4] 1 is a perspective view of a part of the structure of a linear vibration motor according to the present invention. [Figure 5] 1 is a perspective view of a part of the structure of a linear vibration motor according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the drawings and specific embodiments.

[0020] As shown in Figures 1 and 2, the present invention provides a linear vibration motor 100, which includes a housing 1 having an accommodation space 10, and a vibration assembly 2 and a stator assembly 3 housed in the accommodation space 10.

[0021] The housing 1 includes an upper housing 11 having an accommodating space and a lower housing 12 fixed to the upper housing 11, and the upper housing 11 and the lower housing 12 surround and define the accommodating space 10.

[0022] 2, the vibration assembly 2 includes a mass block 21 accommodated in the accommodation space 10, a plurality of magnetic steel pieces 22 fixed to the mass block 21, an elastic member 23 that drives the mass block 21 to reciprocate, and a pole plate 24 fixed to the mass block 21. Specifically, the mass block 21 has through holes 211 that pass through it, the plurality of magnetic steel pieces 22 are accommodated in the through holes 211, and the pole plate 24 is installed above the magnetic steel pieces 22 and covers the through holes 211. In this embodiment, the number of magnetic steel pieces 22 is three.

[0023] The stator assembly 3 includes an iron core 31, a coil 32 surrounded on the outside of the iron core 31, and a flexible circuit board 33 that electrically connects the coil 32 to an external circuit, the flexible circuit board 33 being fixed to the lower housing 12, and the coil 32 being fixed to the side of the flexible circuit board 33 facing the mass block 21 and disposed opposite to and spaced apart from the magnetic steel 22. The coil 32 and the magnetic steel 22 are disposed opposite to each other and generate an interaction force that drives the mass block 21 and the magnetic steel 22 to vibrate reciprocally.

[0024] 2 to 4, the elastic member 23 includes a first fixed portion 231 fixed to the upper housing 11, a first elastic portion 232 extending from one end of the first fixed portion 231 to the mass block 21, a second fixed portion 233 extending from the first elastic portion 232 until it is fixed to the mass block 21, a second elastic portion 234 extending from the other end of the first elastic portion 232 to the mass block 21, and a third fixed portion 235 extending from the second elastic portion 234 until it is fixed to the mass block 21. The first elastic portion 232 and the second elastic portion 234 are located on both sides of a first central axis AA' of the first fixed portion 231 and have an asymmetric structure. As will be understood, the first central axis AA' is parallel to the vibration direction of the linear vibration motor 100. Specifically, the mass block 21 includes a fixed surface 212 that is fixed to the elastic member 23, and the second fixed portion 233 and the third fixed portion 235 are each fixed to both ends of the fixed surface 212 along a direction perpendicular to the vibration direction.

[0025] In this embodiment, the number of the elastic members 23 is two, and the two elastic members 23 are respectively provided on both sides of the mass block 21 along the vibration direction, and the two elastic members 23 exhibit a rotationally symmetric structure with respect to a second central axis BB' perpendicular to the vibration direction of the mass block 21.

[0026] As shown in Figures 4 and 5, the first elastic portion 232 includes a first elastic arm 2321 extending from the first fixed portion 231, a first bending portion 2322 extending from the first elastic arm 2321, a second elastic arm 2323 extending from the first bending portion 2322, a second bending portion 2324 extending from the second elastic arm 2323, a third elastic arm 2325 extending from the second bending portion 2324, a third bending portion 2326 extending from the third elastic arm 2325, and a fourth elastic arm 2327 extending from the third bending portion 2326 to connect to the second fixed portion 233.

[0027] The second elastic portion 234 extends in a straight line, that is, the second elastic portion 234 is a straight elastic piece, and does not have a bent structure.

[0028] The extending direction of the first elastic arm 2321 intersects with the extending direction of the second elastic arm 2323, and more specifically, the angle between the first elastic arm 2321 and the second elastic arm 2323 is an obtuse angle. The extending direction of the third elastic arm 2325 intersects with the extending direction of the second elastic arm 2323, and more specifically, the angle between the second elastic arm 2323 and the third elastic arm 2325 is a right angle. The extending direction of the fourth elastic arm 2327 intersects with the extending direction of the third elastic arm 2325, and the angle between the third elastic arm 2325 and the fourth elastic arm 2327 is an obtuse angle. Furthermore, the first bending portion 2322, the second bending portion 2324, and the third bending portion 2326 all have an arc shape.

[0029] In this embodiment, the orientation of the opening formed between the first elastic arm 2321 and the second elastic arm 2323 is opposite to that of the opening formed between the second elastic arm 2323 and the third elastic arm 2325. The orientation of the opening formed between the second elastic arm 2323 and the third elastic arm 2325 is opposite to that of the opening formed between the third elastic arm 2325 and the fourth elastic arm 2327.

[0030] Compared to the related art, the linear vibration motor of the present invention includes a housing having an accommodation space, a vibration assembly and a stator assembly accommodated in the accommodation space. The vibration assembly includes a mass block accommodated in the accommodation space, a magnetic steel member fixed to the mass block, and an elastic member 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 to the mass block, a second fixed portion extending from the first elastic portion to be fixed to the mass block, a second elastic portion extending from the other end of the first elastic portion to the mass block, and a third fixed portion extending from the second elastic portion to be fixed to the mass block. The first elastic portion and the second elastic portion are located on both sides of a first central axis of the first fixed portion and have an asymmetric structure. The asymmetric structure of the first elastic portion and the second elastic portion effectively avoids the risk of fracture of the elastic member due to stress concentration, significantly improving the reliability of the linear vibration motor. Furthermore, by adjusting the asymmetric structure of the first elastic part and the second elastic part, F0 and mode can be adjusted, improving the design margin of the linear vibration motor.

[0031] The above is only an embodiment of the present invention, and various modifications may be made by those skilled in the art to which the present invention pertains without departing from the creative concept of the present invention, and it should be understood that all of these modifications fall within the scope of the present invention.

Claims

1. A linear vibration motor including a housing having an accommodation space, and a vibration assembly and a stator assembly housed in the accommodation space, wherein the vibration assembly includes a mass block housed in the accommodation space, a magnetic steel member fixed to the mass block, and an elastic member that drives the mass block to reciprocate, and the stator assembly includes a coil disposed opposite the magnetic steel member, 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 to the mass block, a second fixed portion extending from the first elastic portion until being fixed to the mass block, a second elastic portion extending from the other end of the first fixed portion to the mass block, and a third fixed portion extending from the second elastic portion until being fixed to the mass block, the first elastic portion and the second elastic portion being located on both sides of a first central axis of the first fixed portion and having an asymmetric structure; the first elastic portion includes a first elastic arm extending from the first fixed portion, a second elastic arm connected to the second fixed portion via a third elastic arm and a fourth elastic arm, and a first bent 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, the first elastic portion further includes a second bent portion extending from the second elastic arm and the third elastic arm extending from the second bent portion, the third elastic arm is connected to the second fixed portion via the fourth elastic arm, and an extending direction of the third elastic arm intersects with an extending direction of the second elastic arm; The second elastic portion extends in a straight line. The angle between the second elastic arm and the third elastic arm is a right angle; 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 fixed portion, and the extension direction of the fourth elastic arm intersects with the extension direction of the third elastic arm.

2. The linear vibration motor according to claim 1 , wherein the first bent portion, the second bent portion, and the third bent portion are all arc-shaped.

3. 2. The linear vibration motor according to claim 1, wherein the angle between the first elastic arm and the second elastic arm is an obtuse angle, and the angle between the third elastic arm and the fourth elastic arm is an obtuse angle.

4. 2. The linear vibration motor according to claim 1, wherein the number of elastic members is two, the two elastic members are respectively installed on both sides of the mass block along the vibration direction, and have a rotationally symmetric structure with respect to a second central axis perpendicular to the vibration direction of the mass block.

5. The linear vibration motor according to claim 1, characterized in that the mass block includes a fixed surface that is fixed to the elastic member, and the second fixed portion and the third fixed portion are each fixed to both ends of the fixed surface along a direction perpendicular to the vibration direction.

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