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 in particular 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 favored by people. These electronic products generally use linear vibration motors to provide system feedback, such as incoming call notification, information notification, navigation notification for mobile phones, 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, a 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 to drive 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 concentration is likely to occur in the elastic arms, leading to breakage, and therefore the reliability of the linear vibration motor is low.

[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. The linear vibration motor includes a housing having an accommodation space, and 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 fixed to the mass block, and an elastic member that drives the mass block to reciprocate. The stator assembly includes a coil installed facing the magnetic steel, and 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.

[0008] Preferably, 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, and a first bent portion connecting the first elastic arm and the second elastic arm, and the extension direction of the first elastic arm intersects with the extension direction of the second elastic arm.

[0009] Preferably, 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 fixed portion, and the extension direction of the third elastic arm intersects with the extension direction of the second elastic arm.

[0010] Preferably, 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.

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

[0012] Preferably, the second elastic portion extends in a straight line.

[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.

[0014] Preferably, the angle between the second resilient arm and the third resilient arm is a right 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 present 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 fixing surface to which the elastic member is fixed, and the second fixing portion and the third fixing portion are fixed to both ends of the fixing surface along a direction perpendicular to the vibration direction. Effect of the Invention

[0017] Compared with the related art, the linear vibration motor according to the present invention includes a housing having an accommodation space, a vibration assembly and a stator assembly accommodated in the accommodation space, and the vibration assembly includes a mass block accommodated in the accommodation space, a magnetic steel fixed to the mass block, and an elastic member for driving 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 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 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. By making the first elastic part and the second elastic part asymmetric, the risk of breakage due to stress concentration in the elastic member can be effectively avoided, and the reliability of the linear vibration motor can be significantly improved. Moreover, by adjusting the asymmetric structure of the first elastic part and the second elastic part, it is possible to adjust F0 and mode, thereby improving the design margin of the linear vibration motor. [Brief description of the drawings]

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

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the technical solutions of the present invention will be described clearly and completely 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 for driving the mass block 21 to reciprocate, and a pole plate 24 fixed to the mass block 21. Specifically, the mass block 21 is provided with a through hole 211 penetrating therethrough, a plurality of the magnetic steel pieces 22 are accommodated in the through hole 211, and the pole plate 24 is provided above the magnetic steel pieces 22 and covers the through hole 211. In this embodiment, the number of the 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 is fixed to the lower housing 12, and the coil 32 is fixed to the side of the flexible circuit board 33 facing the mass block 21 and is disposed facing the magnetic steel 22 with a gap therebetween. The coil 3 and the magnetic steel 22 are disposed facing each other and generate an interaction force to drive the reciprocating vibration of the mass block 21 and the magnetic steel 22.

[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 the 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 along a direction perpendicular to the vibration direction of the fixed surface 212.

[0025] In this embodiment, the number of 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 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 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 bent portion 2322, the second bent portion 2324, and the third bent 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 with the related art, the linear vibration motor according to the present invention includes a housing having an accommodation space, a vibration assembly and a stator assembly accommodated in the accommodation space, and the vibration assembly includes a mass block accommodated in the accommodation space, a magnetic steel fixed to the mass block, and an elastic member for driving 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 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 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. By making the first elastic part and the second elastic part asymmetric, the risk of breakage due to stress concentration in the elastic member can be effectively avoided, and the reliability of the linear vibration motor can be significantly improved. Moreover, by adjusting the asymmetric structure of the first elastic part and the second elastic part, it is possible to adjust F0 and mode, thereby 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, but 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 accommodated in the accommodation space, the vibration assembly including a mass block accommodated in the accommodation space, a magnetic steel fixed to the mass block, and an elastic member for driving the mass block to reciprocate, and the stator assembly including a coil disposed opposite the magnetic steel, 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 it is 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 until it is fixed to the mass block, wherein 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.

2. The linear vibration motor of claim 1, characterized in that 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, and a first bent portion connecting the first elastic arm and the second elastic arm, and the extension direction of the first elastic arm intersects with the extension direction of the second elastic arm.

3. 3. The linear vibration motor of 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 fixed portion, and the extension direction of the third elastic arm intersects with the extension direction of the second elastic arm.

4. The linear vibration motor of claim 3, characterized in that 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.

5. The linear vibration motor according to claim 4 , wherein the first bent portion, the second bent portion and the third bent portion are all arc-shaped.

6. The linear vibration motor according to claim 1 , wherein the second elastic portion extends in a straight line.

7. 5. The linear vibration motor according to claim 4, wherein an included angle between the first elastic arm and the second elastic arm is an obtuse angle, and an included angle between the third elastic arm and the fourth elastic arm is an obtuse angle.

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

9. 2. The linear vibration motor according to claim 1, wherein 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.

10. 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 along a direction perpendicular to the vibration direction of the fixed surface.

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