Linear Vibration Motor

Abstract

The present invention provides a linear vibrating motor. [Solution] A linear vibration motor includes a housing, a stator mounted in the housing, a vibrator, and an elastic connecting member suspending the vibrator in the housing, the stator includes a solenoid fixed to the housing, the vibrator includes a mass block with a through hole and a magnetic steel assembly fixed to an inner wall surrounding the through hole of the mass block, the elastic connecting member includes at least two plate-shaped elastic pieces arranged in parallel, and spacers provided on both ends of the adjacent elastic pieces to separate the two adjacent elastic pieces, one end of the elastic connecting member is connected to the mass block, and the other end is connected to the housing via a first welding sheet. The elastic connecting member of the present invention has high rigidity, the vibrator is not easily reversed during the movement process, the proportion of noise can be effectively reduced, and the vibration state is more stable.

Description

[Technical field]

[0001] The present invention relates to the field of vibration motors, and in particular to linear vibration motors. [Background technology]

[0002] A linear motor is a transmission device that converts electrical energy directly into linear motion mechanical energy without the need for any intermediate conversion mechanism.

[0003] A conventional linear vibration motor includes a housing, a vibrator and a stator, and generally, the vibrator is fixed in the housing through a V-type or C-type spring bracket and elastically supported. However, the rigidity of the V-type or C-type spring bracket is not sufficient, the difference between the first mode and the second mode is only about two times, the difference between the second mode and the third mode is generally within 60Hz, and the vibrator is easy to reverse during the movement process. When the requirements for the resonance frequency of the product are high, the general method is to increase the thickness of the V-type or C-type spring bracket, thus significantly improving the spring stress, but the spring bracket is prone to fatigue failure, which is disadvantageous to improving the reliability of the product. When the requirements for the spring stress are high, the conventional V-type and C-type spring brackets can also reduce the stress by improving the punching shape, but this improvement method has limited effect and requires repeated trial and error, and is low in efficiency. In addition, the shape of the conventional V-type and C-type spring brackets is complicated, and the manufacturing and assembly process is complicated, which is disadvantageous to controlling the cost of the product.

[0004] Therefore, there is a need 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, in which the elastic connecting member has high rigidity, the vibration noise of the vibrator is small, and the vibration state is stable. [Means for solving the problem]

[0006] In order to achieve the above object, the technical solution of the present invention is as follows: A linear vibration motor comprising: a housing; a stator mounted in the housing; a vibrator; and an elastic connecting member suspending the vibrator within the housing, wherein the stator comprises a solenoid fixed to the housing; the vibrator comprises a mass block having a through hole and a magnetic steel assembly fixed to an inner wall surrounding the through hole of the mass block; the elastic connecting member comprises at least two plate-shaped elastic pieces arranged in parallel and spacers arranged on both ends of adjacent elastic pieces to separate the two adjacent elastic pieces; the linear vibration motor further comprises a first welding sheet, wherein one end of the elastic connecting member is connected to the mass block and the other end is connected to the housing via the first welding sheet.

[0007] Preferably, the spacer is a welded sheet, and the spacer is fixed between two adjacent elastic pieces by welding.

[0008] Preferably, the elastic piece includes a first elastic piece fixedly connected to the mass block and a second elastic piece fixedly connected to the housing, and the elastic connecting member further includes a second welding sheet installed at one end of the first elastic piece that is not fixed to the mass block, and a third welding sheet installed at one end of the second elastic piece that is not fixed to the housing.

[0009] Preferably, the thickness of the first weld sheet is greater than the thickness of the second weld sheet, and the thickness of the first weld sheet is greater than the thickness of the third weld sheet.

[0010] Preferably, the mass block is provided with a protrusion formed to extend along the vibration direction of the vibrator, and the first elastic piece is fixed to the protrusion.

[0011] Preferably, the elastic connecting member further includes a third elastic piece disposed between the first elastic piece and the second elastic piece.

[0012] Preferably, the distance between the third elastic piece and the first elastic piece is equal to the distance between the third elastic piece and the second elastic piece.

[0013] Preferably, the magnetic steel assembly includes a first magnetic steel installed on both sides of the solenoid along the vibration direction of the vibrator, and a second magnetic steel installed on both ends of the solenoid along a direction perpendicular to the vibration direction of the vibrator.

[0014] Preferably, the magnetic steel assembly further includes a first pole plate installed between the inner wall of the mass block and the first magnetic steel, and a second pole plate installed between the inner wall of the mass block and the second magnetic steel.

[0015] Compared with the related art, the linear vibration motor provided by the present invention includes a housing, a stator mounted in the housing, a vibrator, and an elastic connecting member suspending the vibrator in the housing, the stator includes a solenoid fixed to the housing, the vibrator includes a mass block having a through hole and a magnetic steel assembly fixed to an inner wall surrounding the through hole of the mass block, the elastic connecting member includes at least two plate-shaped elastic pieces installed in parallel, and spacers installed on both ends of the adjacent elastic pieces to separate the two adjacent elastic pieces, and the linear vibration motor further includes a first welding sheet, one end of the elastic connecting member is connected to the mass block and the other end is connected to the housing via the first welding sheet. The elastic connecting member of the linear vibration motor of the present invention has flat elastic pieces connected to each other in a parallel form, which increases the rigidity of the elastic connecting member, and the difference between the first mode and the second mode can reach about three times, and the difference between the second mode and the third mode can reach about two times, so that the vibrator is less likely to excite a higher mode during the movement process, is less likely to reverse during the movement process of the vibrator, and the noise rate can be effectively reduced and the vibration state is more stable. If the requirement for the resonance frequency of the linear vibration motor is high, the design purpose can be achieved by increasing the thickness of the flat elastic pieces or increasing the number of parallel elastic pieces, which provides more options than the conventional solutions. If the requirement for the resonance frequency of the linear vibration motor is high and the thickness of the flat elastic pieces is increased, the stress of the flat elastic pieces is not sensitive to the thickness of the material, so that the stress of the elastic connecting member does not increase rapidly due to the increase in the thickness of the material, which does not impair the reliability of the product. When the stress requirements of the elastic connecting member of the linear vibration motor are high, the improvement objective can be achieved by increasing the number of parallel elastic pieces and reducing the thickness of the material. This method has a significant effect, and the flat elastic piece is a simple punched material, has a simple shape, and the manufacturing and assembly process is simple, which is advantageous for controlling manufacturing costs. [Brief description of the drawings]

[0016] [Figure 1] 1 is a schematic perspective view showing a configuration of a linear vibration motor according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a partial exploded view of the linear vibration motor shown in FIG. [Diagram 3] FIG. 2 is an exploded view of the linear vibration motor shown in FIG. [Figure 4] 2 is an exploded view of some members of the linear vibration motor shown in FIG. 1. [Diagram 5] FIG. 2 is a cross-sectional view taken along the line AA in FIG. [Figure 6] FIG. 11 is a schematic perspective view showing the configuration of some members of a linear vibration motor according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, but it is clear that the described embodiments are only some of the embodiments of the present invention, and are not all of the embodiments. All other embodiments obtained based on the embodiments of the present invention without the creative labor of those skilled in the art shall fall within the protection scope of the present invention.

[0018] At the same time, as shown in Figures 1 to 5, a first embodiment of the present invention provides a linear vibration motor 100, which includes a housing 1, a stator 2 mounted in the housing 1, a vibrator 3, an elastic connecting member 4 for suspending the vibrator 3 in the housing 1, partition pieces 5 fixed to both sides of the housing 1, and a circuit board 6.

[0019] The housing 1 includes an upper cover 11, a lower cover 12 disposed opposite the upper cover 11, and an enclosure wall 13 connecting the upper cover 11 and the lower cover, and the upper cover 11, the lower cover 12 and the enclosure wall 13 form a space surrounding and accommodating the stator 2 and the vibrator 3. The stator 2 is fixedly attached to the lower cover 12, and a portion of the circuit board 6 extends outside the housing 1.

[0020] The stator 2 includes a solenoid 21 fixed to the lower cover 12, and the axis of the solenoid 21 is parallel to the vibration direction of the vibrator 3. The solenoid 21 includes an iron core 211 and a coil 212 wound around the iron core 211, the coil 212 is electrically connected to the circuit board 6, and an AC current is introduced into the coil 212.

[0021] The vibrator 3 is suspended in the housing 1 via the elastic connection member 4, and the vibrator vibrates left and right along the horizontal direction, so that the linear vibration motor 100 provides a sense of vibration. The vibrator 3 includes a mass block 31 having a through hole 311 and a magnetic steel assembly 32 fixed to an inner wall 312 surrounding the through hole 311 of the mass block 31. The magnetic steel assembly 32 is installed surrounding the solenoid 21, and includes a first magnetic steel 321 installed on both sides of the solenoid 21 along the vibration direction of the vibrator 3, a second magnetic steel 322 installed on both sides of the solenoid 21 along a direction perpendicular to the vibration direction of the vibrator 3, a first pole plate 323 installed between the inner wall 312 of the mass block 31 and the first magnetic steel 321, and a second pole plate 324 installed between the inner wall 312 of the mass block 31 and the second magnetic steel 322. The first magnetic steel 321 is provided in two pieces, one on each side of the solenoid 21, the first magnetic steel 321 is magnetized along a direction perpendicular to the vibration direction of the vibrator 3, and the two first magnetic steels 321 are provided so that the same poles face each other. The first magnetic steel 321 may be magnetized in a single stage or in multiple stages. For example, three-stage magnetization is used, in which the magnetization directions of adjacent segments are opposite. The second magnetic steel 322 is provided in two pieces, one on each side of the solenoid 21, the second magnetic steel 322 is magnetized along the vibration direction of the vibrator 3, and the two second magnetic steels 322 are provided so that the same poles face each other. In this embodiment, the first magnetic steel 321 and the second magnetic steel 322 are bonded and fixed to the first pole plate 323 and the second pole plate 324 by an adhesive.

[0022] The mass block 31 is provided with a protrusion 313 formed to extend along the vibration direction of the vibrator 3, and the protrusion 313 is formed to protrude from a diagonal position of the mass block 31.

[0023] When an alternating current is introduced into the coil 212, the magnetic induction wire of the magnetic steel assembly 32 is cut to generate an induced electromotive force, so that the magnetic steel assembly 32 and the mass block 31 fixed thereto vibrate back and forth to provide a motor vibration sensation. The elastic connection member 4 elastically supports the vibrator 3. The linear vibration motor 100 further includes a first welding sheet 71. The elastic connection member 4 has one end connected to the mass block 31 and the other end connected to the housing 1 via the first welding sheet 71, and provides an elastic restoring force to the vibrator 3. The elastic connection member 4 includes at least two plate-shaped elastic pieces 41 installed in parallel and spacers 42 installed at both ends of the adjacent elastic pieces 41 to separate the two adjacent elastic pieces 41. In this embodiment, the number of the elastic pieces 41 is two, the spacers 42 are welding sheets, and the spacers 42 are fixed by welding between the two adjacent elastic pieces 41.

[0024] Specifically, the elastic piece 41 includes a first elastic piece 411 fixedly connected to the mass block 31 and a second elastic piece 412 fixedly connected to the housing 1, and the elastic connection member 4 further includes a second welding sheet 72 installed at one end of the first elastic piece 411 not fixed to the mass block 31, and a third welding sheet 73 installed at one end of the second elastic piece 412 not fixed to the housing 1. The thickness of the first welding sheet 71 is greater than the thickness of the second welding sheet 72, and the thickness of the first welding sheet 71 is greater than the thickness of the third welding sheet 73. The first elastic piece 411 is fixed to the protrusion 313, and the thickness of the first welding sheet 71 can be adjusted according to the thickness of the protrusion 313 on the mass block 31, which is suitable for providing a sufficient vibration space for the vibrator 3.

[0025] The partition piece 5 is fixed to the lower cover 12 and is disposed on the vibration path of the vibrator 3 in order to limit the displacement of the vibrator 3 .

[0026] 6, the second embodiment of the present invention has the same structure as the first embodiment, except that the elastic connecting member 4 further includes a third elastic piece 413 disposed between the first elastic piece 411 and the second elastic piece 412. Preferably, the distance between the third elastic piece 413 and the first elastic piece 411 is equal to the distance between the third elastic piece 413 and the second elastic piece 412.

[0027] In the present invention, there is no limit to the number of elastic pieces, and the corresponding number can be set according to actual needs.

[0028] Compared with the related art, the linear vibration motor provided by the present invention includes a housing, a stator mounted in the housing, a vibrator, and an elastic connecting member suspending the vibrator in the housing, the stator includes a solenoid fixed to the housing, the vibrator includes a mass block having a through hole and a magnetic steel assembly fixed to an inner wall surrounding the through hole of the mass block, the elastic connecting member includes at least two plate-shaped elastic pieces installed in parallel, and spacers installed on both ends of the adjacent elastic pieces to separate the two adjacent elastic pieces, and the linear vibration motor further includes a first welding sheet, one end of the elastic connecting member is connected to the mass block and the other end is connected to the housing via the first welding sheet. The elastic connecting member of the linear vibration motor of the present invention has flat elastic pieces connected to each other in a parallel form, which increases the rigidity of the elastic connecting member, and the difference between the first mode and the second mode can reach about three times, and the difference between the second mode and the third mode can reach about two times, which makes it difficult for the vibrator to excite a higher mode during the movement process, and difficult for the vibrator to reverse during the movement process, effectively reducing the noise rate and making the vibration state more stable. If the linear vibration motor has a high requirement for the resonance frequency, the design purpose can be achieved by increasing the thickness of the flat elastic pieces or increasing the number of parallel elastic pieces, which provides more options than the conventional solutions. If the linear vibration motor has a high requirement for the resonance frequency and the thickness of the flat elastic pieces is increased, the stress of the flat elastic pieces is not sensitive to the thickness of the material, so that the stress of the elastic connecting member does not increase rapidly due to the increase in the thickness of the material, which does not impair the reliability of the product. When the stress requirements of the elastic connecting member of the linear vibration motor are high, the improvement objectives can be achieved by increasing the number of parallel elastic pieces and reducing the thickness of the material. This method has a significant effect, and the flat elastic piece is a simple punched material, has a simple shape, and the manufacturing and assembly process is simple, which is advantageous for controlling manufacturing costs.

[0029] 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. 1. A linear vibration motor, comprising: The linear vibration motor includes a housing, a stator mounted in the housing, a vibrator, and an elastic connecting member suspending the vibrator within the housing; the stator includes a solenoid fixed to the housing; The vibrator includes a mass block having a through hole and a magnetic steel assembly fixed to an inner wall surrounding the through hole of the mass block; The elastic connection member includes at least two plate-shaped elastic pieces arranged in parallel, and spacers arranged on both ends of adjacent elastic pieces to separate the adjacent two elastic pieces, the elastic piece includes a first elastic piece fixedly connected to the mass block and a second elastic piece fixedly connected to the housing, The elastic piece includes a first welded sheet provided at one end of the second elastic piece that is fixed to the housing, a second welded sheet provided at one end of the first elastic piece that is not fixed to the mass block, and a third welded sheet provided at one end of the second elastic piece that is not fixed to the housing, A linear vibration motor, characterized in that the spacer is a welded sheet, and the spacer is fixed by welding between two adjacent elastic pieces.

2. 2. The linear vibration motor of claim 1, wherein a thickness of the first welding sheet is greater than a thickness of the second welding sheet, and a thickness of the first welding sheet is greater than a thickness of the third welding sheet.

3. 2. The linear vibration motor according to claim 1, wherein the mass block has a protrusion formed to extend along the vibration direction of the vibrator, and the first elastic piece is fixed to the protrusion.

4. The linear vibration motor according to claim 1 , wherein the elastic connecting member further includes a third elastic piece disposed between the first elastic piece and the second elastic piece.

5. 5. The linear vibration motor according to claim 4, wherein a distance between the third elastic piece and the first elastic piece is equal to a distance between the third elastic piece and the second elastic piece.

6. 2. The linear vibration motor according to claim 1, wherein the magnetic steel assembly includes a first magnetic steel installed on both sides of the solenoid along the vibration direction of the vibrator, and a second magnetic steel installed on both ends of the solenoid along a direction perpendicular to the vibration direction of the vibrator.

7. 7. The linear vibration motor of claim 6, wherein the magnetic steel assembly further includes a first pole plate installed between the inner wall of the mass block and the first magnetic steel, and a second pole plate installed between the inner wall of the mass block and the second magnetic steel.

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