Linear Oscillating Motor

Abstract

The present invention provides a linear vibration motor comprising: a housing having an accommodation space, a stator, a vibrator, and an elastic member fixed to the housing to suspend the vibrator in the accommodation space; the stator and the vibrator are accommodated in the accommodation space; the vibrator includes a mass block fixedly connected to the elastic member and having a through hole, and a magnetic circuit system accommodated in the through hole; the magnetic circuit system includes a first magnetic steel provided on one side of the stator in a direction perpendicular to the vibration direction of the vibrator, and a second magnetic steel provided on the other side of the stator in a direction perpendicular to the vibration direction of the vibrator; the first magnetic steel and the second magnetic steel extend parallel to each other and are arranged symmetrically with respect to the geometric center of the stator; the first magnetic steel includes a first magnetic steel portion whose orthogonal projection along the direction perpendicular to the vibration direction of the vibrator is located outside the second magnetic steel; and the second magnetic steel includes a second magnetic steel portion whose orthogonal projection along the direction perpendicular to the vibration direction of the vibrator is located outside the first magnetic steel. This asymmetric magnetic circuit structure design can improve the situation where nonlinear vibration occurs in the vibration motor due to misalignment of the stator mounting position, thereby improving test stability and yield.

Description

[Technical Field]

[0001] The present invention relates to a linear vibration motor, and more particularly to a magnetic circuit structure of a linear vibration motor. [Background technology]

[0002] A linear motor is a transmission device that directly converts electrical energy into mechanical energy for linear motion, and is also known as a linear motor, straight-line motor, or push-rod motor. A linear motor typically includes an oscillator and a stator, and the oscillator's reciprocating motion is generally achieved by the action of ampere force, eliminating the need for a transmission mechanism such as gears. Linear motors are widely used in various manufacturing and processing technology fields due to their advantages such as simple structure, high acceleration, and high precision.

[0003] The magnetic circuits of conventional linear vibration motors are designed with a symmetrical structure, but when the stator is fixed, the mounting position is easily misaligned, causing nonlinear vibrations in the vibration motor.

[0004] Therefore, it is necessary to provide a new linear vibration motor to solve the above technical problems. Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a linear vibration motor with improved stability and yield. [Means for solving the problem]

[0006] The present invention provides a linear vibration motor comprising: a housing having an accommodation space; a stator; a vibrator; and an elastic member fixed to the housing and suspending the vibrator in the accommodation space; the stator and the vibrator are accommodated in the accommodation space; the vibrator comprises a mass block fixedly connected to the elastic member and having a through hole; and a magnetic circuit system accommodated in the through hole; the magnetic circuit system comprises a first magnetic steel provided on one side of the stator in a direction perpendicular to the vibration direction of the vibrator; and a second magnetic steel provided on the other side of the stator in a direction perpendicular to the vibration direction of the vibrator; the first magnetic steel and the second magnetic steel extend parallel to each other and are arranged symmetrically with respect to the geometric center of the stator; the first magnetic steel includes a first magnetic steel portion whose orthogonal projection along the direction perpendicular to the vibration direction of the vibrator is located outside the second magnetic steel; and the second magnetic steel includes a second magnetic steel portion whose orthogonal projection along the direction perpendicular to the vibration direction of the vibrator is located outside the first magnetic steel.

[0007] Preferably, the first magnetic steel portion and the second magnetic steel portion have the same length.

[0008] Preferably, the proportional value between the length of the first magnetic steel portion and the length of the first magnetic steel is less than 1 / 10, and the proportional value between the length of the second magnetic steel portion and the length of the second magnetic steel is less than 1 / 10.

[0009] Preferably, the range of the proportional value between the length of the first magnetic steel portion and the length of the first magnetic steel is 1 / 25 to 1 / 20, and the range of the proportional value between the length of the second magnetic steel portion and the length of the second magnetic steel is 1 / 25 to 1 / 20. Preferably, the magnetic circuit system includes a third magnetic steel provided on one side of the stator in the vibration direction of the vibrator, and a fourth magnetic steel provided on the other side of the stator in the vibration direction of the vibrator, and the third magnetic steel and the fourth magnetic steel are arranged symmetrically with respect to the geometric center of the stator as the central axis.

[0010] Preferably, the distance between the first magnetic steel and the stator is equal to the distance between the second magnetic steel and the stator, and the distance between the third magnetic steel and the stator is equal to the distance between the fourth magnetic steel and the stator.

[0011] Preferably, the magnetic circuit system includes a first magnetic conductive sheet sandwiched between the first magnetic steel and the mass block, a second magnetic conductive sheet sandwiched between the second magnetic steel and the mass block, a third magnetic conductive sheet sandwiched between the third magnetic steel and the mass block, and a fourth magnetic conductive sheet sandwiched between the fourth magnetic steel and the mass block.

[0012] Preferably, the first magnetic conductive sheet and the first magnetic steel are aligned and have the same length, the second magnetic conductive sheet and the second magnetic steel are aligned and have the same length, the third magnetic conductive sheet and the third magnetic steel are aligned and have the same length, and the fourth magnetic conductive sheet and the fourth magnetic steel are aligned and have the same length.

[0013] Preferably, the elastic member includes an elastic arm spaced apart from the mass block, a first connecting arm bent and extended from one end of the elastic arm and fixed to the mass block, and a second connecting arm bent and extended from the other end of the elastic arm and fixed to the housing, and the linear vibration motor further includes a foam member provided between the elastic arm and the mass block. [Effects of the Invention]

[0014] The present invention provides a linear vibration motor with an asymmetrical magnetic circuit structure. Compared with the prior art, this asymmetrical magnetic circuit structure design can improve the situation where nonlinear vibration occurs in the vibration motor due to misalignment of the stator mounting position, thereby improving test stability and yield. [Brief explanation of the drawings]

[0015] In order to more clearly describe the technical means in the embodiments of the present invention, the following briefly describes the accompanying drawings that need to be used to describe the embodiments. The drawings described below are only for describing the embodiments of the present invention, and those skilled in the art can obtain other drawings from these drawings without any creative efforts. [Figure 1] 1 is a conceptual diagram of a three-dimensional structure of a linear vibration motor according to an embodiment of the present invention. [Figure 2] This is a conceptual diagram of the three-dimensional structure from the linear vibration motor shown in Figure 1 to the lower cover. [Figure 3] FIG. 2 is an exploded view of the linear vibration motor shown in FIG. 1. [Figure 4] 2 is a cross-sectional view of the linear vibration motor shown in FIG. 1 taken along line AA. [Figure 5] FIG. 2 is a conceptual structural diagram of the magnetic circuit system and stator in the linear vibration motor shown in FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0016] The technical means of the present invention will be described clearly and in detail below with reference to the accompanying drawings. The described embodiments are only some of the embodiments of the present invention, and are not all of the embodiments. Based on the embodiments of the present invention, any other embodiments that can be obtained by a person skilled in the art without creative work are included in the protection scope of the present invention.

[0017] 1 to 5, the present invention provides a linear vibration motor 100. The linear vibration motor 100 includes a housing 1, a stator 2 and a vibrator 3 mounted within the housing 1, an elastic member 4 suspending the vibrator 3 within the housing 1, a foam 5 provided between the elastic member 4 and the vibrator 3, and a circuit board 6 a portion of which is fixed within the housing 1, the circuit board 6 being fixed to the housing 1 and electrically connected to the stator 2. If the vibration direction of the vibrator 3 is defined as the Y-axis direction and the direction perpendicular to the vibration direction of the vibrator 3 is defined as the X-axis direction, the linear vibration motor 100 of this embodiment has a rectangular cross section, with the major axis direction being the Y-axis direction and the minor axis direction being the X-axis direction.

[0018] The housing 1 includes a lower cover 11 and an upper cover 12 provided to cover the lower cover 11, the stator 2 is fixed to the side of the lower cover 11 closer to the upper cover 12, and the lower cover 11 and the upper cover 12 are fixed together to form an accommodation space 10 that accommodates the stator 2, the vibrator 3, and the elastic member 4. The housing 1 further includes a recess 101 through which the other end of the circuit board 6 extends outward.

[0019] The stator 2 includes an iron core 21 and a coil 22 wound around the iron core 21 .

[0020] The vibrator 3 includes a mass block 31 having a through hole 310 and a magnetic circuit system 32 housed in the through hole 310. The magnetic circuit system 32 includes a first magnetic steel 301 provided on one side of the stator 2 in the X-axis direction, a second magnetic steel 302 provided on the other side of the stator 2 in the X-axis direction, a third magnetic steel 303 provided on one side of the stator 2 in the Y-axis direction, and a fourth magnetic steel 304 provided on the other side of the stator 2 in the Y-axis direction. The first magnetic steel 301 and the second magnetic steel 302 extend parallel to each other along the Y-axis direction and are symmetrical with respect to the geometric center of the stator 2. The third magnetic steel 303 and the fourth magnetic steel 304 extend parallel to each other along the X-axis direction and are symmetrical with respect to the geometric center of the stator 2.

[0021] The distances D1 between the first permanent magnet 301 and the stator 2, the distance D2 between the first permanent magnet 302 and the stator 2, the distance D3 between the third permanent magnet 303 and the stator 2, and the distance D4 between the fourth permanent magnet 304 and the stator 2 satisfy the relational expressions D1 = D2, D3 = D4, and D1 < D3.

[0022] The first permanent magnet 301 includes a first permanent magnet portion 3011 whose orthographic projection along the X-axis direction is located outside the second permanent magnet 302. The second permanent magnet 302 includes a second permanent magnet portion 3021 whose orthographic projection along the X-axis direction is located outside the first permanent magnet 301. The proportional value of the length of the first permanent magnet portion 3011 to the length of the first permanent magnet 301 is less than 1 / 10, and the proportional value of the length of the second permanent magnet portion 3021 to the length of the second permanent magnet is less than 1 / 10. In this embodiment, preferably, the length of the first permanent magnet portion 3011 is 4.5% of the total length of the first permanent magnet 301, and the length of the second permanent magnet portion 3021 is 4.5% of the total length of the second permanent magnet.

[0023] The magnetic circuit system 32 further includes a first magnetic conductive sheet 311 sandwiched between the first permanent magnet 301 and the mass block 31, a second magnetic conductive sheet 312 sandwiched between the second permanent magnet 302 and the mass block 31, a third magnetic conductive sheet 313 sandwiched between the third permanent magnet 303 and the mass block 31, and a fourth magnetic conductive sheet 314 sandwiched between the fourth permanent magnet 304 and the mass block 31. The first magnetic conductive sheet 311 and the first permanent magnet 301 are aligned and have the same length. The second magnetic conductive sheet 312 and the second permanent magnet 302 are aligned and have the same length. The third magnetic conductive sheet 313 and the third permanent magnet 303 are aligned and have the same length. The fourth magnetic conductive sheet 314 and the fourth permanent magnet 304 are aligned and have the same length.

[0024] The elastic member 4 includes an elastic arm 41 spaced apart from the mass block 31, a first connecting arm 42 bent and extended from one end of the elastic arm 41 and fixed to the mass block 31, and a second connecting arm 43 bent and extended from the other end of the elastic arm 41 and fixed to the housing 1.

[0025] The linear vibration motor 100 includes a first welding sheet 71 that welds the first connecting arm 42 and the mass block 31 together at a welding point, and a second welding sheet 72 that welds the second connecting arm 43 and the upper cover portion 12 together at a welding point.

[0026] The linear vibration motor 100 further includes a position limiting block 8 , which is fixed to the lower cover 11 and limits the displacement amount of the vibrator 3 .

[0027] Compared to the prior art, the present invention provides a linear vibration motor comprising: a housing having an accommodation space, a stator, a vibrator, and an elastic member fixed to the housing to suspend the vibrator in the accommodation space; the stator and the vibrator are accommodated in the accommodation space; the vibrator comprises a mass block fixedly connected to the elastic member and having a through hole, and a magnetic circuit system accommodated in the through hole; the magnetic circuit system comprises a first magnetic steel provided on one side of the stator in a direction perpendicular to the vibration direction of the vibrator, and a second magnetic steel provided on the other side of the stator in a direction perpendicular to the vibration direction of the vibrator; the first magnetic steel and the second magnetic steel extend parallel to each other and are arranged symmetrically with respect to the geometric center of the stator; the first magnetic steel includes a first magnetic steel portion that is located outside the second magnetic steel when orthogonally projected along the direction perpendicular to the vibration direction of the vibrator; and the second magnetic steel includes a second magnetic steel portion that is located outside the first magnetic steel when orthogonally projected along the direction perpendicular to the vibration direction of the vibrator. The asymmetric magnetic circuit structure design of the present invention can improve the situation where nonlinear vibration occurs in the vibration motor due to misalignment of the stator mounting position, thereby improving the stability and yield of the test.

[0028] Although the embodiments of the present invention have been described in detail above, those skilled in the art can make modifications without departing from the spirit of the present invention, and all such modifications are within the scope of the present invention.

Claims

1. A linear vibration motor, The linear vibration motor The oscillator includes a housing having an accommodation space, a stator, a vibrator, and an elastic member fixed to the housing to suspend the vibrator in the accommodation space, the stator and the vibrator are accommodated in the accommodation space, the vibrator includes a mass block fixedly connected to the elastic member and having a through hole, and a magnetic circuit system housed in the through hole; the magnetic circuit system includes a first magnetic steel provided on one side of the stator in a direction perpendicular to the vibration direction of the vibrator, and a second magnetic steel provided on the other side of the stator in a direction perpendicular to the vibration direction of the vibrator, the first magnetic steel and the second magnetic steel extend in parallel and are provided symmetrically with respect to a geometric center of the stator as a central axis, A linear vibration motor characterized in that the first magnetic steel includes a first magnetic steel portion whose orthogonal projection along a direction perpendicular to the vibration direction of the vibrator is located outside the second magnetic steel, and the second magnetic steel includes a second magnetic steel portion whose orthogonal projection along a direction perpendicular to the vibration direction of the vibrator is located outside the first magnetic steel.

2. The linear vibration motor according to claim 1 , wherein the first magnetic steel portion and the second magnetic steel portion have the same length.

3. The proportional value between the length of the first magnetic steel portion and the length of the first magnetic steel is less than 1 / 10, 3. The linear vibration motor according to claim 2, wherein the proportional value between the length of the second magnetic steel portion and the length of the second magnetic steel is less than 1 / 10.

4. the range of the proportional value between the length of the first magnetic steel portion and the length of the first magnetic steel is 1 / 25 to 1 / 20; 4. The linear vibration motor according to claim 3, wherein the range of the proportional value between the length of the second magnetic steel portion and the length of the second magnetic steel portion is 1 / 25 to 1 / 20.

5. 5. The linear vibration motor of claim 4, wherein the magnetic circuit system includes a third magnetic steel provided on one side of the stator in the vibration direction of the vibrator and a fourth magnetic steel provided on the other side of the stator in the vibration direction of the vibrator, and the third magnetic steel and the fourth magnetic steel are arranged symmetrically with respect to the geometric center of the stator as a central axis.

6. 6. The linear vibration motor according to claim 5, wherein the distance between the first magnetic steel and the stator is equal to the distance between the second magnetic steel and the stator, and the distance between the third magnetic steel and the stator is equal to the distance between the fourth magnetic steel and the stator.

7. 6. The linear vibration motor of claim 5, wherein the magnetic circuit system includes a first magnetic conductive sheet sandwiched between the first magnetic steel and the mass block, a second magnetic conductive sheet sandwiched between the second magnetic steel and the mass block, a third magnetic conductive sheet sandwiched between the third magnetic steel and the mass block, and a fourth magnetic conductive sheet sandwiched between the fourth magnetic steel and the mass block.

8. the first magnetic conductive sheet and the first magnetic steel sheet are aligned and have the same length; the second magnetic conductive sheet and the second magnetic steel sheet are aligned and have the same length; the third magnetic conductive sheet and the third magnetic steel are aligned and have the same length; 8. The linear vibration motor of claim 7, wherein the fourth magnetic conductive sheet and the fourth magnetic steel are aligned and have the same length.

9. the elastic member includes an elastic arm spaced apart from the mass block, a first connecting arm bent and extending from one end of the elastic arm and fixed to the mass block, and a second connecting arm bent and extending from the other end of the elastic arm and fixed to the housing, The linear vibration motor of claim 1 , further comprising a foam member disposed between the elastic arm and the mass block.

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