Linear vibration motor

Abstract

The utility model discloses a linear vibration motor comprising a housing, a stator assembly, a vibrator assembly and an elastic member are installed in an inner cavity enclosed by the housing, the vibrator assembly is suspended in the inner cavity through the elastic member, the stator assembly comprises a coil and a conductive damping member, and the coil and the conductive damping member are respectively located at two sides of the vibrator assembly and are in clearance fit with each other; the vibrator assembly comprises a mass block, a first magnetic circuit assembly and a second magnetic circuit assembly. The side, facing the conductive damping piece, of the mass block and the side, facing the coil, of the mass block are each provided with a groove. The first magnetic circuit assembly and the second magnetic circuit assembly are installed in the two grooves respectively. Two groups of magnetic circuit assemblies are adopted to respectively control damping and driving force of the motor, so that adjustment is facilitated; the motor is reasonable and compact in structure, and compared with an existing linear motor, large electromagnetic driving force and electromagnetic damping force are provided under the same size, and stronger vibration sense is provided for customers.

Description

Technical Field

[0001] This utility model relates to the field of electronic product technology, and in particular to a linear vibration motor. Background Technology

[0002] With the gradual development of electronic product technology, vibration motors have become common functional components in electronic products such as mobile phones and tablets. Existing vibration motors typically consist of an oscillator assembly and a stator assembly. The oscillator assembly comprises a mass block, a magnetic circuit assembly, and springs, while the stator assembly consists of a circuit board, damping, limit blocks, an iron core, and coils. To enable the oscillator assembly to reciprocate, an electromagnetic interaction must be generated between the coils and the magnetic circuit assembly. Changes in the current within the coils create changes in the magnetic field, causing the oscillator assembly to move.

[0003] Because electromagnetic damping exhibits good stability under high temperature and humidity conditions, linear motors with electromagnetic damping are widely used in devices such as mobile phones and gamepads. As the performance of linear motors improves, the demand for electromagnetic damping also increases. In current technology, when the linear motor is small, the damping provided by the copper sheet is insufficient, resulting in a longer descent time. How to provide sufficient electromagnetic damping, shorten the descent time, and improve the user experience while meeting the required driving force is a technical problem that needs to be solved in current technology. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a linear vibration motor that provides a larger electromagnetic driving force and electromagnetic damping force within the same volume, thereby providing users with a stronger vibration sensation.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a linear vibration motor, including a housing, in which a stator assembly, an oscillator assembly and an elastic element are installed in the inner cavity enclosed by the housing, the oscillator assembly is suspended in the inner cavity via the elastic element, the stator assembly includes a coil and a conductive damping element, the coil and the conductive damping element are respectively located on both sides of the oscillator assembly and are clearance-fitted.

[0006] The oscillator assembly includes a mass block, a first magnetic circuit assembly, and a second magnetic circuit assembly. The mass block has grooves on both the side facing the conductive damping element and the side facing the coil. At least one groove penetrates the mass block along the vibration direction of the oscillator assembly, or at least one groove penetrates the mass block along a direction perpendicular to the vibration direction of the oscillator assembly and perpendicular to the winding axis of the coil. The first magnetic circuit assembly and the second magnetic circuit assembly are respectively installed in the two grooves.

[0007] Preferably, the two grooves include a first groove facing the conductive damping element and a second groove facing the coil.

[0008] The first groove extends through the mass block along the vibration direction of the oscillator assembly.

[0009] Preferably, the second groove forms a receiving cavity with an opening facing the coil side, and the second magnetic circuit assembly is fixed inside the receiving cavity.

[0010] Preferably, the first magnetic circuit assembly is fixed in the first groove, and the two end faces of the first magnetic circuit assembly along the vibration direction of the oscillator assembly are flush or substantially flush with the outer surface of the mass block.

[0011] And / or, the first groove is provided with sidewalls extending along the vibration direction of the oscillator assembly on both sides, the distance between the inner sides of the two sidewalls away from the bottom of the first groove is greater than the width of the conductive damping element, a portion of the conductive damping element extends into the first groove, and the first magnetic circuit assembly is fixed to the bottom of the groove.

[0012] And / or, the first groove is provided with sidewalls extending along the vibration direction of the oscillator assembly on both sides, and the inner side of the sidewall away from the bottom of the first groove is provided with a stepped portion to avoid the conductive damping element, and the first magnetic circuit assembly is fixed to the bottom of the groove.

[0013] Preferably, the first magnetic circuit assembly is located between the second magnetic circuit assembly and the conductive damping element. The first magnetic circuit assembly includes a first side magnet and a second side magnet distributed along the vibration direction of the oscillator assembly. The magnetization direction of the first side magnet and the magnetization direction of the second side magnet are opposite and both are perpendicular to the plane where the conductive damping element is located.

[0014] Preferably, a first central magnet is disposed between the first side magnet and the second side magnet, and the magnetization direction of the first central magnet is perpendicular to the magnetization direction of the first side magnet. The first side magnet, the first central magnet and the second side magnet constitute a Heilbeck magnetic circuit.

[0015] Preferably, the second magnetic circuit assembly is located between the first magnetic circuit assembly and the coil. The second magnetic circuit assembly includes a third side magnet and a fourth side magnet distributed along the vibration direction of the oscillator assembly. The magnetization direction of the third side magnet and the magnetization direction of the fourth side magnet are opposite and both are parallel to the winding axis of the coil.

[0016] Preferably, a second central magnet is disposed between the third and fourth side magnets, and the magnetization direction of the second central magnet is perpendicular to the magnetization direction of the third side magnet. The third side magnet, the second central magnet, and the fourth side magnet constitute a Heilbeck magnetic circuit.

[0017] Preferably, the conductive damping element includes a copper sheet fixedly connected to the inner wall of the housing.

[0018] Preferably, the copper sheet is rectangular, and a pair of diagonally opposite portions of the copper sheet are provided to avoid the mass block.

[0019] The beneficial effects of this application are as follows:

[0020] The linear vibration motor described in this application includes a housing. A stator assembly, an oscillator assembly, and an elastic element are installed within the inner cavity enclosed by the housing. The oscillator assembly is suspended in the inner cavity via the elastic element. The stator assembly includes a coil and a conductive damping element, which are located on opposite sides of the oscillator assembly and are clearance-fitted. The oscillator assembly includes a mass block, a first magnetic circuit assembly, and a second magnetic circuit assembly. The mass block has grooves on both the side facing the conductive damping element and the side facing the coil. At least one groove penetrates the mass block along the vibration direction of the oscillator assembly, or at least one groove penetrates the mass block along a direction perpendicular to the vibration direction of the oscillator assembly and perpendicular to the winding axis of the coil. The first magnetic circuit assembly and the second magnetic circuit assembly are respectively installed in the two grooves. Using two sets of magnetic circuit assemblies, the damping and driving force of the motor are controlled separately, facilitating adjustment. This motor has a reasonable and compact structure, providing a larger electromagnetic driving force and electromagnetic damping force within the same volume compared to existing linear motors, thus providing customers with a stronger vibration sensation. Attached Figure Description

[0021] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0022] Figure 1 This is a schematic diagram of the structure of the first embodiment of this utility model (hidden upper shell). Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the structure of the first embodiment of this utility model (concealing the upper shell and the conductive damping component). Figure 2 ;

[0024] Figure 3 This is an exploded view of the first embodiment of this utility model;

[0025] Figure 4 This is a cross-sectional view of the first embodiment of the present invention;

[0026] Figure 5 This is a cross-sectional view of the second embodiment of the present invention;

[0027] Figure 6 This is a cross-sectional view of the third embodiment of this utility model;

[0028] Figure 7 This is a cross-sectional view of the fourth embodiment of this utility model;

[0029] Figure 8 This is a cross-sectional view of the fifth embodiment of this utility model;

[0030] In the diagram: 11-coil; 12-conductive damping element; 21-mass block; 22-first groove; 23-second groove; 31-upper shell; 32-lower shell; 4-elastic element; 51-first side magnet; 52-second side magnet; 53-first center magnet; 61-third side magnet; 62-fourth side magnet; 63-second center magnet. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0032] like Figures 1 to 4 As shown, a linear vibration motor includes a housing. A stator assembly, an oscillator assembly, and an elastic element are installed within an inner cavity enclosed by the housing. The oscillator assembly is suspended within the inner cavity via the elastic element. The stator assembly includes a coil 11 and a conductive damping element 12, located on opposite sides of the oscillator assembly with a clearance fit. The oscillator assembly includes a mass block 21, a first magnetic circuit assembly, and a second magnetic circuit assembly. The mass block 21 has grooves on both the side facing the conductive damping element 12 and the side facing the coil 11. At least one groove penetrates the mass block 21 along the vibration direction of the oscillator assembly, or at least one groove penetrates the mass block 21 along a direction perpendicular to the vibration direction of the oscillator assembly and perpendicular to the winding axis of the coil 11. The first magnetic circuit assembly and the second magnetic circuit assembly are respectively installed within the two grooves. Magnetic circuit components are respectively set on both sides of the mass block 21. The damping force and driving force of the motor are controlled by the two magnetic circuit components respectively, which is convenient for adjustment. The motor has a reasonable and compact structure. The structure with the groove running through the horizontal direction makes the magnetic circuit component larger. Compared with the existing linear motor, it provides a larger electromagnetic driving force and electromagnetic damping force in the same volume, providing customers with a stronger vibration.

[0033] According to some embodiments of this application, the two grooves include a first groove 22 facing the conductive damping element 12 and a second groove 23 facing the coil 11; the first groove 22 penetrates the mass block 21 along the vibration direction of the oscillator assembly. Thus, the magnetic circuit assembly located in the first groove 22 has a larger volume, the magnetic field strength on the conductive damping element 12 side is greater, and the obtained electromagnetic damping effect is better.

[0034] In one embodiment of this application, the first magnetic circuit assembly is fixed in the first groove 22, and the two end faces of the first magnetic circuit assembly along the vibration direction of the oscillator assembly are flush or substantially flush with the outer surface of the mass block 21, thereby maximizing the first magnetic circuit assembly in a limited space.

[0035] In one embodiment of this application, the first groove 22 is provided with sidewalls extending along the vibration direction of the oscillator assembly on both sides. The distance between the inner surfaces of the two sidewalls at the ends away from the bottom of the first groove 22 is greater than the width of the conductive damping element 12. A portion of the conductive damping element 12 extends into the first groove 22. The first magnetic circuit assembly is fixed to the bottom of the groove, which can reduce the product thickness.

[0036] In one embodiment of this application, the first groove 22 is provided with sidewalls extending along the vibration direction of the oscillator assembly on both sides, and the inner side of the sidewall away from the bottom of the first groove 22 is provided with a stepped portion to avoid the conductive damping member 12, and the first magnetic circuit assembly is fixed to the bottom of the groove.

[0037] A first groove 22 is provided on the mass block 21 for mounting the first magnetic circuit assembly. The first groove 22 faces the conductive damping element 12. The conductive damping element 12 is driven by the first magnetic circuit assembly to work, thereby realizing the electromagnetic damping effect of the motor. At the same time, the first magnetic circuit assembly is embedded in the mass block 21, so the volume of the internal structure of the motor will not increase due to adding an additional set of magnetic circuit assemblies. This ensures that independent damping driving force is provided while meeting the motor volume requirements, thereby improving the performance of the motor.

[0038] According to some embodiments of this application, the second groove 23 forms a receiving cavity with an opening facing the coil 11, and the second magnetic circuit assembly is fixed in the receiving cavity. The second magnetic circuit assembly is installed in the second groove 23, ensuring a secure connection and preventing detachment due to long-term vibration. Furthermore, this structural design optimizes the internal structure of the motor while ensuring its performance.

[0039] In this invention, the first groove 22 penetrates the mass block 21 along the vibration direction. In this case, the second groove 23 can penetrate the mass block 21 along the vibration direction, or in a direction perpendicular to the vibration direction and perpendicular to the winding axis of the coil 11, or the second groove 23 can form a receiving cavity with an opening facing the coil 11. In all these cases, the magnetic field strength generated by the magnetic circuit assembly in the first groove 22 can be improved. Alternatively, the first groove 22 can penetrate the mass block 21 along a direction perpendicular to the vibration direction and perpendicular to the winding axis of the coil 11. In this case, the second groove 23 can penetrate the mass block 21 along the vibration direction, or in a direction perpendicular to the vibration direction and perpendicular to the winding axis of the coil 11, or the second groove 23 can form a receiving cavity with an opening facing the coil 11. In all these cases, the magnetic field strength generated by the magnetic circuit assembly in the first groove 22 can be improved. Alternatively, the second groove 23 can penetrate the mass block 21 along the vibration direction. In this case, the first groove 22 can penetrate the mass block 21 along the vibration direction, penetrate the mass block 21 along a direction perpendicular to the vibration direction and perpendicular to the winding axis of the coil 11, or the first groove 23 can form a receiving cavity with an opening on one side of the guide damping member 12. The magnetic field strength generated by the magnetic circuit assembly in the second groove 23 can be improved. Alternatively, the second groove 23 can penetrate the mass block 21 along a direction perpendicular to the vibration direction and perpendicular to the winding axis of the coil 11. In this case, the first groove 22 can penetrate the mass block 21 along the vibration direction, penetrate the mass block 21 along a direction perpendicular to the vibration direction and perpendicular to the winding axis of the coil 11, or the first groove 23 can form a receiving cavity with an opening on one side of the guide damping member 12. The magnetic field strength generated by the magnetic circuit assembly in the second groove 23 can be improved.

[0040] According to some embodiments of this application, the housing includes an upper shell 31 and a lower shell 32 that are fastened together. A coil 11 is mounted on the lower shell 32, and a conductive damping element 12 is fixedly mounted on the upper shell 31. An elastic element 4 is installed between the two sides of the vibrator assembly and the inner wall of the upper shell 31. The elastic element 4 is used to suspend the vibrator assembly within the inner cavity of the housing. The elastic element 4 is a commonly used component of a vibration motor, and its specific structure and working principle will not be described in detail here. The coil 11 can be wound around an iron core and is mounted on a circuit board. The circuit board is fixedly connected to the lower shell 32, and the axial direction of the iron core is perpendicular to the lower shell 32.

[0041] According to some embodiments of this application, such as Figure 4 and Figure 5As shown, the first magnetic circuit assembly is located between the second magnetic circuit assembly and the conductive damping element 12. The first magnetic circuit assembly includes a first side magnet 51 and a second side magnet 52 distributed along the vibration direction of the oscillator assembly. A first center magnet 53 is disposed between the first side magnet 51 and the second side magnet 52. The magnetization directions of the first side magnet 51 and the second side magnet 52 are opposite and both are perpendicular to the plane of the conductive damping element 12. The magnetization direction of the first center magnet 53 is perpendicular to the magnetization directions of the first side magnet 51 and the second side magnet 52. The first side magnet 51, the first center magnet 53, and the second side magnet 52 constitute a Heilbeck magnetic circuit. The second magnetic circuit assembly includes a third side magnet 61 and a fourth side magnet 62 distributed along the vibration direction of the oscillator assembly. A second center magnet 63 is disposed between the third side magnet 61 and the fourth side magnet 62. The magnetization directions of the third side magnet 61 and the fourth side magnet 62 are opposite and both are parallel to the winding axis of the coil 11. The magnetization direction of the second central magnet 63 is perpendicular to the magnetization directions of the third side magnet 61 and the fourth side magnet 62. The third side magnet 61, the second central magnet 63, and the fourth side magnet 62 constitute a Heilbeck magnetic circuit. Both magnetic circuit components are equipped with a central magnet. Figure 4 and Figure 5 The diagram shows two magnetization directions. Figure 4 and Figure 5 Only two specific examples of magnetization directions are given; other magnetization directions that meet the requirements will not be listed here. The central magnet of the magnetic circuit assembly can balance the magnetic field strength generated by the two side magnets, making the vibration direction more linear and the amplitude more uniform. The magnetization area of ​​the central magnet is parallel to the vibration direction, which can precisely control the range of magnetic field action and improve the strength and consistency of vibration feedback. By rationally arranging the structure of the oscillator assembly, and setting magnetic circuit assemblies corresponding to the conductive damping element 12 and the coil 11 respectively, independent control of damping force and driving force can be achieved, which is conducive to adjustment and provides a larger electromagnetic driving force and electromagnetic damping force in the same volume, providing users with a stronger vibration feel.

[0042] According to some embodiments of this application, such as Figure 6As shown, the first magnetic circuit assembly includes a first side magnet 51 and a second side magnet 52 distributed along the vibration direction of the oscillator assembly. The magnetization directions of the first side magnet 51 and the second side magnet 52 are opposite and both are perpendicular to the plane of the conductive damping element 12. The second magnetic circuit assembly includes a third side magnet 61 and a fourth side magnet 62 distributed along the vibration direction of the oscillator assembly. A second center magnet 63 is disposed between the third side magnet 61 and the fourth side magnet 62. The magnetization directions of the third side magnet 61 and the fourth side magnet 62 are opposite and both are parallel to the winding axis of the coil 11. The magnetization direction of the second center magnet 63 is perpendicular to the magnetization directions of the third side magnet 61 and the fourth side magnet 62. The third side magnet 61, the second center magnet 63, and the fourth side magnet 62 constitute a Heilbeck magnetic circuit. Figure 6 Only one specific magnetization direction example is given; other magnetization directions that meet the requirements will not be listed here. The first magnetic circuit assembly only includes two side magnets; omitting the central magnet reduces the number of parts and assembly complexity, and improves assembly efficiency.

[0043] According to some embodiments of this application, such as Figure 7 As shown, the first magnetic circuit assembly includes a first side magnet 51 and a second side magnet 52 distributed along the vibration direction of the oscillator assembly. A first center magnet 53 is disposed between the first side magnet 51 and the second side magnet 52. The magnetization directions of the first side magnet 51 and the second side magnet 52 are opposite and both are perpendicular to the plane of the conductive damping element 12. The magnetization direction of the first center magnet 53 is perpendicular to the magnetization directions of the first side magnet 51 and the second side magnet 52. The first side magnet 51, the first center magnet 53, and the second side magnet 52 constitute a Heilbeck magnetic circuit. The second magnetic circuit assembly includes a third side magnet 61 and a fourth side magnet 62 distributed along the vibration direction of the oscillator assembly. The magnetization directions of the third side magnet 61 and the fourth side magnet 62 are opposite and both are parallel to the winding axis of the coil 11. Figure 7 Only one example of a specific magnetization direction is given; other magnetization directions that meet the requirements will not be listed here. The second magnetic circuit assembly only includes two side magnets; omitting the central magnet reduces the number of parts and assembly complexity, and improves assembly efficiency.

[0044] According to some embodiments of this application, the first magnetic circuit assembly includes a first side magnet 51 and a second side magnet 52 distributed along the vibration direction of the oscillator assembly. The magnetization directions of the first side magnet 51 and the second side magnet 52 are opposite and both are perpendicular to the plane containing the conductive damping element 12. The second magnetic circuit assembly includes a third side magnet 61 and a fourth side magnet 62 distributed along the vibration direction of the oscillator assembly. The magnetization directions of the third side magnet 61 and the fourth side magnet 62 are opposite and both are parallel to the winding axis of the coil 11. Figure 8 Only one specific magnetization direction example is given; other magnetization directions that meet the requirements will not be listed here. The first and second magnetic circuit assemblies only include two side magnets. Omitting the central magnet reduces the number of parts and assembly complexity, improves assembly efficiency, and is suitable for volume-sensitive applications.

[0045] Furthermore, the conductive damping component 12 includes a copper sheet fixedly connected to the inner wall of the housing. The copper sheet is rectangular, and a pair of diagonally opposite corners of the copper sheet are provided with a material removal section to avoid the mass block 21. Considering the structural requirements of the mass block 21, one corner is cut off from each of the two diagonal corners of the copper sheet as a clearance, making the internal structure of the motor more reasonable and compact. The copper sheet is located above the mass block 21 and fixedly connected to the upper shell 31, which has good magnetic conductivity. Under the action of electromagnetic force, the first magnetic circuit assembly reciprocates, causing the magnetic field lines penetrating the copper sheet to alternately change, generating significant electromagnetic damping, effectively reducing the noise level of the motor during operation and improving the quietness performance of the equipment.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A linear vibration motor, comprising a housing, wherein a stator assembly, an oscillator assembly, and an elastic element are mounted within an inner cavity enclosed by the housing, the oscillator assembly being suspended within the inner cavity via the elastic element, characterized in that: The stator assembly includes a coil and a conductive damping element, the coil and the conductive damping element being located on opposite sides of the oscillator assembly and fitted with a clearance. The oscillator assembly includes a mass block, a first magnetic circuit assembly, and a second magnetic circuit assembly. The mass block has grooves on both the side facing the conductive damping element and the side facing the coil. At least one groove penetrates the mass block along the vibration direction of the oscillator assembly, or at least one groove penetrates the mass block along a direction perpendicular to the vibration direction of the oscillator assembly and perpendicular to the winding axis of the coil. The first magnetic circuit assembly and the second magnetic circuit assembly are respectively installed in the two grooves.

2. The linear vibration motor according to claim 1, characterized in that: The two grooves include a first groove facing the side of the conductive damping element and a second groove facing the side of the coil; The first groove extends through the mass block along the vibration direction of the oscillator assembly.

3. The linear vibration motor according to claim 2, characterized in that: The second groove forms a receiving cavity with an opening facing the coil side, and the second magnetic circuit assembly is fixed inside the receiving cavity.

4. The linear vibration motor according to claim 2, characterized in that: The first magnetic circuit assembly is fixed in the first groove, and the two end faces of the first magnetic circuit assembly along the vibration direction of the oscillator assembly are flush or substantially flush with the outer surface of the mass block. And / or, the first groove is provided with sidewalls extending along the vibration direction of the oscillator assembly on both sides, the distance between the inner sides of the two sidewalls away from the bottom of the first groove is greater than the width of the conductive damping element, a portion of the conductive damping element extends into the first groove, and the first magnetic circuit assembly is fixed to the bottom of the groove. Alternatively, the first groove has sidewalls extending along the vibration direction of the oscillator assembly on both sides, and the inner side of the sidewall away from the bottom of the first groove has a stepped portion to avoid the conductive damping element, and the first magnetic circuit assembly is fixed to the bottom of the groove.

5. The linear vibration motor according to claim 1, characterized in that: The first magnetic circuit assembly is located between the second magnetic circuit assembly and the conductive damping element. The first magnetic circuit assembly includes a first side magnet and a second side magnet distributed along the vibration direction of the oscillator assembly. The magnetization direction of the first side magnet and the magnetization direction of the second side magnet are opposite and both are perpendicular to the plane where the conductive damping element is located.

6. The linear vibration motor according to claim 5, characterized in that: A first central magnet is disposed between the first side magnet and the second side magnet. The magnetization direction of the first central magnet is perpendicular to the magnetization direction of the first side magnet. The first side magnet, the first central magnet, and the second side magnet constitute a Heilbeck magnetic circuit.

7. The linear vibration motor according to claim 1, characterized in that: The second magnetic circuit assembly is located between the first magnetic circuit assembly and the coil. The second magnetic circuit assembly includes a third side magnet and a fourth side magnet distributed along the vibration direction of the oscillator assembly. The magnetization direction of the third side magnet and the magnetization direction of the fourth side magnet are opposite and both are parallel to the winding axis of the coil.

8. The linear vibration motor according to claim 7, characterized in that: A second central magnet is disposed between the third and fourth side magnets. The magnetization direction of the second central magnet is perpendicular to the magnetization direction of the third side magnet. The third side magnet, the second central magnet, and the fourth side magnet constitute a Heilbeck magnetic circuit.

9. The linear vibration motor according to any one of claims 1 to 8, characterized in that: The conductive damping element includes a copper sheet that is fixedly connected to the inner wall of the housing.

10. The linear vibration motor according to claim 9, characterized in that: The copper sheet is rectangular, and a pair of diagonally opposite sections of the copper sheet are provided to avoid the mass block.

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