Linear vibration motor

Abstract

The utility model discloses a linear vibration motor, which comprises a shell, a stator assembly and a vibrator assembly, the stator assembly and the vibrator assembly are arranged in the shell, the vibrator assembly comprises a magnet assembly, and the magnet assembly comprises a middle magnet and a side magnet; the magnetizing directions of the side magnets on the two sides of the middle magnet are opposite and parallel to the first direction, the middle magnet comprises two magnetic areas in the first direction, the magnetizing directions of the two magnetic areas are opposite and parallel to the second direction, and the polarity of the end, close to the side magnet, of each magnetic area is the same as that of the end, close to the side magnet, of the adjacent side magnet. The middle magnet and the side magnets form a Halbach array magnetic circuit, the strongest magnetic field is generated by using the fewest magnets, and the field intensity in the unit direction is enhanced by using a special magnet structure; magnetic leakage is reduced, the utilization rate of a magnetic field is improved, the product driving force is improved, the product vibration quantity is larger, and the vibration sense feedback is stronger; the device has the advantages of high magnetic field effective utilization rate, low magnetic leakage and fast response.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic products, and particularly relates to a linear vibration motor. Background Art

[0002] With the gradual development of electronic product technology, vibration excitation devices have become commonly used functional components in electronic products such as mobile phones and tablet computers. Existing micro vibration excitation devices generally include a vibrator assembly and a stator assembly. The vibrator assembly is composed of a mass block, a magnet, and a shrapnel. The stator assembly is composed of an FPCB, damping, a limiting block, an iron core, and a coil. In order to enable the vibrator assembly to vibrate reciprocally, an electromagnetic interaction needs to be generated between the coil and the magnet. By changing the current in the coil, the magnetic field changes, causing the vibrator assembly to move.

[0003] As an actuator for tactile feedback, linear motors have been widely used in the field of tactile vibration. With the improvement of the functions of current smart wearable devices, users have higher requirements for the feedback of the vibration feeling of smart wearables. Therefore, the demand for vibration feedback of tactile feedback exciters is increasing day by day. In the existing technology, restricted by the structure of the magnetic circuit part of the linear motor, there are technical problems such as small driving force of the motor, low magnetic circuit utilization rate, low overall performance of the product, and low user comfort. Summary of the Utility Model

[0004] One technical problem to be solved by the utility model is to provide a linear vibration motor.

[0005] To solve the above technical problem, the technical solution of the utility model is: a linear vibration motor, including a housing, a stator assembly, and a vibrator assembly. The stator assembly and the vibrator assembly are installed in the housing. The vibrator assembly includes a magnet assembly. The magnet assembly vibrates along a second direction. The magnet assembly includes a middle magnet and side magnets located on both sides of the middle magnet along the second direction. The magnetization directions of the side magnets on both sides of the middle magnet are opposite and parallel to a first direction. The first direction is perpendicular to the second direction. The middle magnet is an integral structure and includes two magnetic regions along the first direction. The magnetization directions of the two magnetic regions are opposite and parallel to the second direction. The polarity of the end of each magnetic region close to the side magnet is the same as the polarity of the adjacent end of the side magnet. Along the first direction, the stator assembly and the magnet assembly are arranged opposite to each other. The stator assembly includes a coil. The two driving sides of the coil correspond to the two side magnets.

[0006] Optionally, the stator assembly further includes a conductive damping member. Along the first direction, the coil and the conductive damping member are respectively arranged on both sides of the magnet assembly and are spaced apart.

[0007] Optionally, coils are arranged on both sides of the magnet assembly along the first direction.

[0008] Optionally, along the second direction, the width of the side magnet is greater than the width of the middle magnet; and / or, along the first direction, the height of the side magnet is the same as the height of the middle magnet; and / or, along the third direction perpendicular to the first and second directions, the width of the side magnet is equal to the width of the middle magnet.

[0009] Optionally, the oscillator assembly includes a mass block, and the mass block is provided with an oscillator cavity penetrating along the first direction, and the magnet assembly is installed in the oscillator cavity.

[0010] Optionally, the oscillator assembly further includes two elastic pieces, and the two elastic pieces are respectively located on both sides of the mass block along the second direction. One end of the elastic piece is connected to the mass block, and the other end of the elastic piece is connected to the housing.

[0011] Optionally, the mass block is provided with an upper avoidance groove, and at least part of the conductive damping member is located in the upper avoidance groove; and / or, the mass block is provided with a lower avoidance groove, and at least part of the coil is located in the lower avoidance groove.

[0012] Optionally, the housing includes a lower case, a middle frame and an upper case assembled together in sequence. The conductive damping member is fixed to the upper case, and the coil is fixed to the lower case.

[0013] Optionally, the conductive damping member is a copper sheet.

[0014] Optionally, along the second direction, the diameter of the coil is not greater than the width of the magnet assembly.

[0015] The beneficial effects of the present application are as follows:

[0016] The linear vibration motor described in the present application includes a housing, a stator assembly and an oscillator assembly. The stator assembly and the oscillator assembly are installed in the housing. The oscillator assembly includes a magnet assembly, and the magnet assembly includes a middle magnet and side magnets. The magnetization directions of the side magnets on both sides of the middle magnet are opposite and parallel to the first direction. The middle magnet includes two magnetic regions along the first direction, and the magnetization directions of the two magnetic regions are opposite and parallel to the second direction. The polarities of the ends of each magnetic region close to the side magnets are the same as the polarities of the adjacent ends of the side magnets. The middle magnet and the side magnets form two Halbach array magnetic circuits, which use the fewest magnets to generate the strongest magnetic field, enhance the magnetic field intensity on both sides of the magnet assembly, thereby improving the driving force of the product, making the vibration amount of the product larger and the vibration feedback stronger. It has the advantages of high magnetic field utilization efficiency, low magnetic leakage and fast response. Description of the Drawings

[0017] The following drawings are only intended to illustrate and explain the present invention schematically and do not limit the scope of the present invention. Among them:

[0018] Figure 1 is the exploded view of the embodiment of the present utility model;

[0019] Figure 2 is the sectional view of the embodiment of the present utility model;

[0020] Figure 3 is the first magnetization direction diagram of the embodiment of the present utility model;

[0021] Figure 4 is the first magnetic induction line distribution diagram of the embodiment of the present utility model;

[0022] Figure 5 is the second magnetization direction diagram of the embodiment of the present utility model;

[0023] Figure 6 is the second magnetic induction line distribution diagram of the embodiment of the present utility model.

[0024] In the figure: 11 - mass block; 12 - oscillator cavity; 13 - lower avoidance groove; 14 - upper avoidance groove; 21 - intermediate magnet; 22 - edge magnet; 3 - elastic sheet; 41 - lower shell; 42 - middle frame; 43 - upper shell; 5 - FPCB circuit board; 61 - coil; 62 - conductive damping component. Detailed implementation manners

[0025] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments. In the following detailed description, only some exemplary embodiments of the present utility model are described by way of illustration. It is understood that those of ordinary skill in the art can recognize that various different modifications can be made to the described embodiments without departing from the spirit and scope of the present utility model. Therefore, the accompanying drawings and the description are illustrative in nature and are not intended to limit the scope of protection of the claims.

[0026] Such as Figures 1 to 6As shown in the figure, a linear vibration motor includes a housing, a stator assembly, and a vibrator assembly. The stator assembly and the vibrator assembly are installed in the housing. The vibrator assembly includes a magnet assembly that vibrates in a second direction. The magnet assembly includes an intermediate magnet 21, and side magnets 22 are respectively arranged on both sides of the intermediate magnet 21 along the second direction. The magnetization directions of the side magnets 22 on both sides of the intermediate magnet 21 are opposite and parallel to a first direction, and the first direction is perpendicular to the second direction. The intermediate magnet 21 is an integral structure and includes two magnetic regions along the first direction, that is, the intermediate magnet 21 is an integrally multi-pole magnetized magnet, and the magnetization directions of the two magnetic regions are opposite and parallel to the second direction. The polarity of the end of each magnetic region close to the side magnet 22 is the same as the polarity of the end of the adjacent side magnet 22. Along the first direction, the stator assembly is disposed opposite to the magnet assembly. The stator assembly includes a coil 61, and the two driving sides of the coil 61 correspond to the two side magnets 22. The intermediate magnet 21 has an integrally multi-pole magnetized structure, which is simple in structure and convenient for assembly. At the same time, it forms a Halbach magnetic circuit with the side magnets 22, enhancing the magnetic field strength on both sides of the magnet assembly.

[0027] In an embodiment, the stator assembly further includes a conductive damping member 62. Along the first direction, the coil 61 and the conductive damping member 62 are respectively disposed on both sides of the magnet assembly and are spaced apart.

[0028] In this embodiment, along the first direction, the conductive damping member 62 is disposed opposite to the magnet assembly to ensure the electromagnetic damping effect.

[0029] In another embodiment, along the first direction, coils 61 are provided on both sides of the magnet assembly, and the magnetic fields where the coils 61 on both sides are located are enhanced, improving the driving force.

[0030] In an embodiment, along the second direction, the width of the side magnet 22 is greater than the width of the intermediate magnet 21. And / or, along the first direction, the height of the side magnet 22 is the same as the height of the intermediate magnet 21. And / or, along a third direction perpendicular to the first direction and the second direction, the width of the side magnet 22 is equal to the width of the intermediate magnet 21.

[0031] In an embodiment, the vibrator assembly includes a mass block 11. The mass block 11 is provided with a vibrator cavity 12 penetrating along the first direction. The vibrator assembly vibrates in a second direction perpendicular to the first direction. The magnet assembly is installed in the vibrator cavity 12 and is located above the coil 61 (the above description of above is based on Figure 2As shown, the oscillator assembly further includes two shrapnel pieces 3. The two shrapnel pieces 3 are respectively located on both sides of the mass block 11 along the second direction. One end of the shrapnel piece 3 is connected to the mass block 11, and the other end of the shrapnel piece 3 is connected to the housing. The shrapnel piece 3 is a V-shaped shrapnel piece. The two shrapnel pieces 3 are arranged in a mirror image on both sides of the mass block 11 to provide a restoring force for the oscillator assembly. The mass block 11 is provided with an upper avoidance groove 14, and at least a part of the conductive damping member 62 is located in the upper avoidance groove 14; and / or, the mass block 11 is provided with a lower avoidance groove 13, and at least a part of the coil 61 is located in the lower avoidance groove 13.

[0032] In one embodiment, the housing includes a lower case 41, a middle frame 42, and an upper case 43 that are assembled together in sequence. The stator assembly is installed on the lower case 41. The conductive damping member 62 is fixed to the upper case 43, and the coil 61 is fixed to the lower case 41. The conductive damping member 62 is a copper sheet. An FPCB circuit board 5 is installed between the stator assembly and the lower case 41.

[0033] In one embodiment, the stator assembly includes a coil 61. The two driving sides of the coil 61 correspond to the two side magnets 22. Along the second direction, the diameter of the coil 61 is not greater than the width of the magnet assembly. The upper end of the coil 61 acts with the magnet assembly to generate a Lorentz force to drive the mass block 11 to perform reciprocating motion.

[0034] The up, down, left, and right in the following description are based on what is shown in the figure.

[0035] Specifically, as Figure 3 and Figure 4 shown, the middle magnet 21 is a multi-pole magnetized magnet, which is divided into upper and lower magnetic regions. The magnetization direction of the upper magnetic region is from right to left, and the magnetization direction of the lower magnetic region is from left to right. The magnetization direction of the left side magnet 22 is from bottom to top, and the magnetization direction of the right side magnet 22 is from top to bottom; the magnetic induction line direction is as Figure 4 shown, forming two closed magnetic circuits distributed up and down. The central magnet and the side magnets 22 on both sides form a Halbach array magnetic circuit, which uses the fewest magnets to generate the strongest magnetic field. Using a special magnet structure, the field strength in the unit direction is enhanced; the magnetic leakage is reduced, the utilization rate of the magnetic field is improved, the driving force of the product is increased, the vibration amount of the product is made larger, and the vibration feedback is stronger.

[0036] Specifically, as Figure 5 and Figure 6 shown, the middle magnet 21 is a multi-pole magnetized magnet, which is divided into upper and lower magnetic regions. The magnetization direction of the upper magnetic region is from left to right, and the magnetization direction of the lower magnetic region is from right to left. The magnetization direction of the left side magnet 22 is from top to bottom, and the magnetization direction of the right side magnet 22 is from bottom to top; the magnetic induction line direction is as Figure 6As shown, two closed magnetic circuits are formed to be distributed vertically and horizontally. The central magnet and the side magnets 22 on both sides form a Halbach array magnetic circuit, which uses the fewest magnets to generate the strongest magnetic field. With a special magnet structure, the field strength in a single direction is enhanced; magnetic leakage is reduced, the utilization rate of the magnetic field is improved, the driving force of the product is increased, the vibration amount of the product is made larger, and the vibration feedback is stronger.

[0037] The above shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A linear vibration motor, comprising a housing, a stator assembly and a vibrator assembly, wherein the stator assembly and the vibrator assembly are installed in the housing, and characterized in that: The oscillator assembly includes a magnet assembly that vibrates in the second direction. The magnet assembly includes a middle magnet and side magnets located on both sides of the middle magnet in the second direction. The magnetization directions of the side magnets on both sides of the middle magnet are opposite and parallel to the first direction, and the first direction is perpendicular to the second direction. The middle magnet is an integral structure and includes two magnetic regions in the first direction. The magnetization directions of the two magnetic regions are opposite and parallel to the second direction. The polarity of the end of each magnetic region close to the side magnet is the same as the polarity of the adjacent end of the side magnet. In the first direction, the stator assembly is disposed opposite to the magnet assembly, and the stator assembly includes a coil. The two driving sides of the coil correspond to the two side magnets.

2. The linear vibration motor according to claim 1, wherein: The stator assembly further includes a conductive damping member. In the first direction, the coil and the conductive damping member are respectively disposed on both sides of the magnet assembly and are spaced apart.

3. The linear vibration motor according to claim 1, wherein: In the first direction, coils are provided on both sides of the magnet assembly.

4. The linear vibration motor according to claim 1, wherein: In the second direction, the width of the side magnet is greater than the width of the middle magnet. And / or, in the first direction, the height of the side magnet is the same as the height of the middle magnet. And / or, in the third direction perpendicular to the first direction and the second direction, the width of the side magnet is equal to the width of the middle magnet.

5. The linear vibration motor according to claim 2, wherein: The oscillator assembly further includes a mass block. The mass block is provided with an oscillator cavity penetrating in the first direction, and the magnet assembly is installed in the oscillator cavity.

6. The linear vibration motor according to claim 5, wherein: The oscillator assembly further includes two elastic pieces. The two elastic pieces are respectively located on both sides of the mass block in the second direction. One end of the elastic piece is connected to the mass block, and the other end of the elastic piece is connected to the housing.

7. The linear vibration motor according to claim 6, wherein: The mass block is provided with an upper avoidance groove, and at least a part of the conductive damping member is located in the upper avoidance groove. And / or, the mass block is provided with a lower avoidance groove, and at least a part of the coil is located in the lower avoidance groove.

8. The linear vibration motor according to claim 2, wherein: The housing includes a lower shell, a middle frame, and an upper shell assembled together in sequence. The conductive damping member is fixed to the upper shell, and the coil is fixed to the lower shell.

9. The linear vibration motor according to claim 2, wherein: The conductive damping member is a copper sheet.

10. The linear vibration motor according to any one of claims 1 to 9, characterized in that: In the second direction, the diameter of the coil is not greater than the width of the magnet assembly.

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