Linear vibration 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 linear vibration motors, and in particular to the magnetic circuit structure of a linear vibration motor. [Background Art]

[0002] A linear motor is a transmission device that directly converts electrical energy into mechanical energy of linear motion, and is also called a linear motor, a linear motion motor, a pushrod motor, etc. A linear motor generally comprises a vibrator and a stator. The reciprocating motion of the vibrator is generally realized by the action of Ampere force, and does not require a transmission mechanism such as a gear. Linear motors are widely used in various manufacturing and processing technical fields because of their advantages such as simple structure, high acceleration and high precision.

[0003] The magnetic circuit of a conventional linear vibration motor is designed in a symmetrical structure, but when the stator is fixed, the mounting position is prone to deviation, which causes nonlinear vibration of 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 better stability and yield. [Means for Solving the Problem]

[0006] The present invention provides a linear vibration motor comprising a housing having a housing space, a stator, a vibrator, and an elastic member fixed to the housing and suspending the vibrator in the housing space, wherein the stator and the vibrator are housed within the housing space, and the vibrator includes a mass block fixedly connected to the elastic member and having a through hole, and a magnetic circuit system housed within the through hole, wherein 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, wherein the first magnetic steel and the second magnetic steel are extended parallel to each other and are provided symmetrically with respect to the geometric center of the stator as the central axis, the first magnetic steel includes a first magnetic steel portion whose orthographic 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 orthographic projection along the direction perpendicular to the vibration direction of the vibrator is located outside the first magnetic steel.

[0007] Preferably, the length of the first magnetic steel portion and the length of the second magnetic steel portion are equal.

[0008] Preferably, the ratio between the length of the first magnetic steel section and the length of the first magnetic steel is less than 1 / 10, and the ratio between the length of the second magnetic steel section 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 direction of vibration of the oscillator, and a fourth magnetic steel provided on the other side of the stator in the direction of vibration of the oscillator, wherein the third magnetic steel and the fourth magnetic steel are provided 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 provided at a distance 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 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 to the conventional technology, this asymmetric magnetic circuit structure design improves the situation where nonlinear vibration of the vibration motor occurs due to misalignment of the stator mounting position, thereby improving the stability and yield of the tests. [Brief explanation of the drawing]

[0015] To more clearly explain the technical means in the embodiments of the present invention, the accompanying drawings that are necessary for describing the embodiments are briefly described below. The drawings described below are merely illustrative of embodiments of the present invention, and those skilled in the art can obtain other drawings from these drawings without any creative effort. [Figure 1] This is a conceptual diagram of the three-dimensional structure of a linear vibration motor according to an embodiment of the present invention. [Figure 2] Figure 1 is a conceptual diagram of the three-dimensional structure from the linear vibration motor to the lower cover section. [Figure 3] Figure 1 is an exploded view of the linear vibration motor. [Figure 4] This is a cross-sectional view of the linear vibration motor shown in Figure 1, along line AA. [Figure 5] Figure 1 is a conceptual diagram of the magnetic circuit system and stator structure in a linear vibration motor. [Modes for carrying out 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 embodiments described are only some, and not all, embodiments of the present invention. All other embodiments that can be obtained without creative work by those skilled in the art based on the embodiments of the present invention are included within the scope of protection of the present invention.

[0017] Referring simultaneously to Figures 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 inside the housing 1, an elastic member 4 that suspends the vibrator 3 inside the housing 1, a foam 5 provided between the elastic member 4 and the vibrator 3, and a circuit board 6, part of which is fixed inside the housing 1. The circuit board 6 is 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, then the linear vibration motor 100 of this embodiment has a rectangular cross-section, with the long axis direction being the Y-axis direction and the short axis direction being the X-axis direction.

[0018] The housing 1 includes a lower cover portion 11 and an upper cover portion 12 provided to cover the lower cover portion 11. The stator 2 is fixed to the side of the lower cover portion 11 closest to the upper cover portion 12, and the lower cover portion 11 and the upper cover portion 12 are fixed together to form a housing space 10 for housing the stator 2, the vibrator 3, and the elastic member 4. The housing 1 further includes a groove 101 for the other end of the circuit board 6 to extend outward.

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

[0020] The oscillator 3 includes a mass block 31 having a through hole 310 and a magnetic circuit system 32 housed within the through hole 310, the magnetic circuit system 32 including 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 are extended parallel to the Y-axis direction and are provided symmetrically with respect to the geometric center of the stator 2. The third magnetic steel 303 and the fourth magnetic steel 304 are extended parallel to the X-axis direction and are provided symmetrically with respect to the geometric center of the stator 2.

[0021] A distance D1 between said first magnetic steel 301 and said stator 2, a distance D2 between said first magnetic steel 302 and said stator 2, a distance D3 between said third magnetic steel 303 and said stator 2, and a distance D4 between said fourth magnetic steel 304 and said stator 2 satisfy the relational expression: D1=D2, D3=D4, D1<D3.

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

[0023] Said magnetic circuit system 32 further comprises a first magnetically conductive sheet 311 sandwiched and disposed between said first magnetic steel 301 and said mass block 31, a second magnetically conductive sheet 312 sandwiched and disposed between said second magnetic steel 302 and said mass block 31, a third magnetically conductive sheet 313 sandwiched and disposed between said third magnetic steel 303 and said mass block 31, and a fourth magnetically conductive sheet 314 sandwiched and disposed between said fourth magnetic steel 304 and said mass block 31. Said first magnetically conductive sheet 311 and said first magnetic steel 301 are aligned and have the same length, said second magnetically conductive sheet 312 and said second magnetic steel 302 are aligned and have the same length, said third magnetically conductive sheet 313 and said third magnetic steel 303 are aligned and have the same length, and said fourth magnetically conductive sheet 314 and said fourth magnetic steel 304 are aligned and have the same length.

[0024] The elastic member 4 includes an elastic arm 41 provided at a distance from the mass block 31, a first connecting arm 42 which is bent and extended from one end of the elastic arm 41 and fixed to the mass block 31, and a second connecting arm 43 which is 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 to the mass block 31 at a welding point, and a second welding sheet 72 that welds the second connecting arm 43 to the upper cover portion 12 at a welding point.

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

[0027] Compared to the prior art, the present invention provides a linear vibration motor comprising a housing having a housing space, a stator, a vibrator, and an elastic member fixed to the housing and suspending the vibrator in the housing space, wherein the stator and the vibrator are housed within the housing space, and the vibrator includes a mass block fixedly connected to the elastic member and having a through hole, and a magnetic circuit system housed within the through hole, wherein 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, wherein the first magnetic steel and the second magnetic steel are extended parallel to each other and provided symmetrically with respect to the geometric center of the stator as the central axis, the first magnetic steel includes a first magnetic steel portion whose orthographic 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 orthographic projection along the direction perpendicular to the vibration direction of the vibrator is located outside the first magnetic steel. The design of the asymmetric magnetic circuit structure of the present invention improves the situation in which nonlinear vibrations of a vibration motor occur due to misalignment of the stator mounting position, thereby improving the stability and yield of the tests.

[0028] Although embodiments of the present invention have been described in detail above, those skilled in the art can improve upon them without departing from the spirit of the invention, but all improvements are considered to fall within the scope of the present invention.

Claims

1. It is a linear vibration motor, The linear vibration motor is It includes a housing having a housing space, a stator, a vibrator, and an elastic member fixed to the housing and suspending the vibrator in the housing space, The stator and the oscillator are housed within the housing space. The vibrator includes a mass block fixedly connected to the elastic member and having a through hole, and a magnetic circuit system housed within 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 oscillator, and a second magnetic steel provided on the other side of the stator opposite to the first magnetic steel in a direction perpendicular to the vibration direction of the oscillator. The first magnetic steel and the second magnetic steel are extended parallel to the vibration direction of the oscillator and are arranged symmetrically with respect to the geometric center of the stator as the central axis. A linear vibration motor characterized in that the first magnetic steel includes a first magnetic steel portion whose orthographic 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 orthographic 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, characterized in that the length of the first magnetic steel section and the length of the second magnetic steel section are equal.

3. The proportionality between the length of the first magnetic steel section and the length of the first magnetic steel is less than 1 / 10. The linear vibration motor according to claim 2, characterized in that the proportionality between the length of the second magnetic steel section and the length of the second magnetic steel is less than 1 / 10.

4. The range of the proportionality between the length of the first magnetic steel section and the length of the first magnetic steel is 1 / 25 to 1 / 20. The linear vibration motor according to claim 3, characterized in that the range of the proportional value between the length of the second magnetic steel section and the length of the second magnetic steel is 1 / 25 to 1 / 20.

5. The linear vibration motor according to 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 oscillator and a fourth magnetic steel provided on the other side of the stator in the vibration direction of the oscillator, and the third magnetic steel and the fourth magnetic steel are provided symmetrically with respect to the geometric center of the stator as the central axis.

6. The linear vibration motor according to claim 5, characterized in that 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. The linear vibration motor according to claim 5, characterized in that 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 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. The linear vibration motor according to claim 7, characterized in that 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 provided at a distance 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. The linear vibration motor according to claim 1, further comprising a foam provided between the elastic arm and the mass block.

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