Linear vibration motor and electronic device

Abstract

The invention discloses a linear vibration motor and electronic equipment, and relates to the technical field of vibration generators, the linear vibration motor comprises a shell, a vibrator assembly and a stator assembly, the vibrator assembly and the stator assembly are contained in the shell, the vibrator assembly is suspended in the shell, electromagnetic damping parts are arranged on the two sides of the vibrator assembly in the first direction, the electromagnetic damping parts are fixed to the shell, and the stator assembly is fixed to the shell. The first direction is perpendicular to the vibration direction of the vibrator assembly; the vibrator assembly comprises a first magnetic circuit assembly and a second magnetic circuit assembly, and the first magnetic circuit assembly and the second magnetic circuit assembly are arranged at an interval along a first direction; the stator assembly comprises a coil and a support which are arranged between the first magnetic circuit assembly and the second magnetic circuit assembly, and the axis direction of the coil is parallel to the first direction. The double magnetic circuits jointly act on the coil, the magnetic field intensity is high, the vibration feedback strength is high, the vibration quality is improved, meanwhile, the magnetic field utilization rate can be increased through the design of the multiple layers of electromagnetic damping pieces, electromagnetic damping is improved, and the braking response time is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vibration generator, in particular to a linear vibration motor and electronic equipment. BACKGROUND

[0002] With the progress of society and the rapid development of technology, electronic products have been widely used. As one of the important components of electronic products, vibration generating devices are used in large quantities. In order to improve the user experience, especially to meet the needs of users for vibration prompt of electronic products, the performance requirements of vibration generating devices are also getting higher and higher.

[0003] In the related art, linear vibration motors are widely used in mobile phones and other devices because of their fast response, obvious directionality of vibration and the ability to improve the user's tactile experience. Generally, linear motors use single-layer magnets, which have limited magnetic field strength, resulting in small Lorentz force on the coil and insufficient vibration feedback. Moreover, part of the magnetic field is not effectively utilized. Single-layer copper sheets are generally used as electromagnetic dampers, and the single-coil structure in conventional motors is usually matched with a large mass vibrator, resulting in a long start-stop time. SUMMARY

[0004] The present application aims to provide a linear vibration motor and electronic equipment to at least partially solve the above technical problems.

[0005] To solve the above technical problems, the present application provides the following technical solutions: In one aspect, the present application provides a linear vibration motor, comprising a shell, a vibrator assembly and a stator assembly accommodated in the shell, the vibrator assembly being suspended in the shell, wherein: In the first direction, both sides of the vibrator assembly are provided with electromagnetic dampers, the electromagnetic dampers being fixed to the shell, and the first direction being perpendicular to the vibration direction of the vibrator assembly; The vibrator assembly comprises a first magnetic circuit assembly and a second magnetic circuit assembly, the first magnetic circuit assembly and the second magnetic circuit assembly are arranged in the first direction, the first magnetic circuit assembly and the second magnetic circuit assembly each comprise a center magnet, a first magnet and a second magnet arranged on both sides of the center magnet along the vibration direction, the magnetization directions of the adjacent first magnet and the second magnet are opposite and parallel to the first direction, the thicknesses of the first magnet and the second magnet are both greater than the thickness of the center magnet along the first direction, and the center of gravity of the center magnet is farther away from the electromagnetic damping element than the center of gravity of the first magnet and the center of gravity of the second magnet, the magnetization direction of the center magnet is parallel to the vibration direction, the polarities of the end portions of the center magnet and the adjacent first magnet and second magnet are the same, and the magnetization direction of the first magnet of the first magnetic circuit assembly is opposite to the magnetization direction of the first magnet of the second magnetic circuit assembly. The stator assembly comprises a coil and a bracket arranged between the first magnetic circuit assembly and the second magnetic circuit assembly, the axis direction of the coil is parallel to the first direction, and the two driving edges of the coil are arranged opposite to the adjacent first magnet and second magnet.

[0006] In some embodiments of the present application, the vibrator assembly further comprises a crossbeam made of a non-magnetic material, the crossbeam is arranged between the adjacent first magnet and second magnet, and the crossbeam is arranged in the first direction and stacked with the center magnet, and the crossbeam is arranged between the center magnet and the electromagnetic damping element.

[0007] In some embodiments of the present application, the vibrator assembly further comprises a mass block, the mass block is provided with a first accommodating hole in the first direction, the crossbeam is arranged in the first accommodating hole and separates the accommodating hole into at least two cavities, the first magnet and the second magnet are respectively embedded in the two cavities, and the crossbeam is integrally formed with the mass block.

[0008] In some embodiments of the present application, the mass block is provided with a second accommodating hole in a second direction, the second direction is perpendicular to the first direction and the vibration direction, so that the mass block forms a first fixing portion and a second fixing portion arranged in the first direction, the first magnetic circuit assembly is fixed to the first fixing portion, and the second magnetic circuit assembly is fixed to the second fixing portion; the coil and the bracket are arranged in the second accommodating hole, and the bracket is fixed to the shell through the second accommodating hole.

[0009] In some embodiments of the present application, the center magnets and the second magnets are both two, the first magnets are located between the two center magnets along the vibration direction, and the two second magnets are located on the two sides of the two center magnets; the coils are also two, the two driving edges of the two coils are located opposite to the first magnets of the magnetic circuit assemblies, and the other two driving edges of the two coils are located opposite to the second magnets of the magnetic circuit assemblies.

[0010] In some embodiments of the present application, the width of the crossbeam is equal to the width of the center magnets, and the width of the center magnets is smaller than the width of the first magnets and the second magnets. And / or, along the first direction, the height of the first magnets and the second magnets is the same, and the sum of the height of the crossbeam and the center magnets is equal to the height of the first magnets. And / or, along the first direction, the height ratio of the crossbeam to the center magnets is 1:3-1:1.

[0011] In some embodiments of the present application, the crossbeam is flush with the side of the first magnets and the second magnets close to the electromagnetic damping element. And / or, the mass block is provided with a first avoiding slot in the middle of the two sides along the first direction, the electromagnetic damping element is at least partially located in the first avoiding slot, and the length of the electromagnetic damping element along the vibration direction is smaller than the length of the first avoiding slot.

[0012] In some embodiments of the present application, the electromagnetic damping element and / or the bracket is a copper sheet.

[0013] In some embodiments of the present application, the shell comprises a lower shell and a dish-shaped upper shell covering the lower shell, wherein: The bracket comprises a main body portion supporting the coil, the main body portion is provided with a bending portion on the two sides along the second direction, the bending portion is fixed to the side wall of the upper shell, and the side surface of the mass block is provided with a second avoiding slot avoiding the bending portion; And / or, the upper shell is provided with a third avoiding slot on the side surface parallel to the vibration direction; And / or, the electromagnetic damping element is fixed to the upper shell and the lower shell respectively.

[0014] In another aspect, the embodiments of the present application provide an electronic device comprising the linear vibration motor.

[0015] The present application has the following advantages: The linear vibration motor and the electronic device of the embodiment of the present application comprise a shell, a vibrator assembly and a stator assembly accommodated in the shell, the vibrator assembly is suspended in the shell, both sides of the vibrator assembly are provided with electromagnetic damping members along a first direction, the electromagnetic damping members are fixed to the shell, and the first direction is perpendicular to the vibration direction of the vibrator assembly; the vibrator assembly comprises a first magnetic circuit assembly and a second magnetic circuit assembly, the first magnetic circuit assembly and the second magnetic circuit assembly are arranged at intervals along the first direction, and the stator assembly comprises a coil and a support arranged between the first magnetic circuit assembly and the second magnetic circuit assembly, and the axis direction of the coil is parallel to the first direction, so that the embodiment of the present application adopts a double magnetic circuit structure (including the first magnetic circuit assembly and the second magnetic circuit assembly), the double magnetic circuits jointly act on the coil, the magnetic field strength is high, the Lorentz force received by the coil is large, the vibration feedback strength is strong, and the vibration quality is improved; the electromagnetic damping members are arranged on both sides of the vibrator assembly in the shell, so that the electromagnetic damping members are designed in two layers, the coil fully utilizes the inside magnetic field of each magnetic circuit assembly, the electromagnetic damping members fully utilize the outside magnetic field of each magnetic circuit assembly, the magnetic field utilization rate can be improved, the electromagnetic damping is improved, and the braking response time is shortened. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which: Figure 1 It is an explosion structure schematic diagram of the linear vibration motor of the embodiment of the present application; Figure 2 It is a perspective structure diagram of the linear vibration motor shown in the figure after removing the upper shell; Figure 1 It is a perspective structure diagram of the linear vibration motor shown in the figure after removing the upper shell; Figure 3 It is a top view structure diagram of the linear vibration motor shown in the figure after removing the upper shell; Figure 1 It is a top view structure diagram of the linear vibration motor shown in the figure after removing the upper shell; Figure 4 Figure 1 It is a position relationship schematic diagram of the magnetic circuit assembly, the mass block, the coil and the electromagnetic damping member in the figure; Figure 5 It is a position relationship schematic diagram of the magnetic circuit assembly, the mass block, the coil and the electromagnetic damping member in the figure; Figure 1 It is a magnetizing direction schematic diagram of the magnetic circuit assembly in the figure.

[0017] Reference signs: 100, linear vibration motor 1, shell, 11, upper shell, 111, third avoiding groove, 12, lower shell, 2, vibrator assembly, 21, first magnetic circuit assembly, 22, second magnetic circuit assembly, 211, first magnet, 212, center magnet, 213, second magnet, 23, mass block, 231, first accommodating hole, 232, second accommodating hole, 233, first avoiding groove, 234, second avoiding groove, 235, crossbeam, 236, first fixing part, 237, second fixing part, ​3. Stator assembly; 31. Coil; 32. Bracket; 321. Main body; 322. Bending section. 4. Shrapnel 5. Electromagnetic damping components. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] On one hand, embodiments of the present invention provide a linear vibration motor 100, such as... Figures 1-5 As shown, the device includes a housing 1, an oscillator assembly 2 housed within the housing 1, and a stator assembly 3. The oscillator assembly 2 is suspended within the housing 1. Electromagnetic damping elements 5 are provided on both sides of the oscillator assembly 2 along a first direction. The electromagnetic damping elements 5 are fixed to the housing 1. The first direction is perpendicular to the vibration direction of the oscillator assembly 2. The oscillator assembly 2 includes a first magnetic circuit assembly 21 and a second magnetic circuit assembly 22. The first magnetic circuit assembly 21 and the second magnetic circuit assembly 22 are spaced apart along the first direction. Both the first magnetic circuit assembly 21 and the second magnetic circuit assembly 22 include a central magnet 212, and first magnets 211 and second magnets 213 located on either side of the central magnet 212 along the vibration direction. The magnetization directions of adjacent first magnets 211 and second magnets 213 are opposite and parallel to the first direction. The thickness of the first magnet 211 and the second magnet 213 along the first direction are... The thickness of magnet 213 is greater than that of the central magnet 212, and the center of gravity of the central magnet 212 is farther away from the electromagnetic damping member 5 than the center of gravity of the first magnet 211 and the second magnet 213. The magnetization direction of the central magnet 212 is parallel to the vibration direction. The polarity of the ends of the central magnet 212 and the adjacent first magnet 211 and second magnet 213 that are close to each other is the same. The magnetization direction of the first magnet 211 of the first magnetic circuit assembly 21 is opposite to that of the first magnet 211 of the second magnetic circuit assembly 22. The stator assembly 3 includes a coil 31 and a bracket 32 ​​disposed between the first magnetic circuit assembly 21 and the second magnetic circuit assembly 22. The axial direction of the coil 31 is parallel to the first direction. The two driving sides of the coil 31 are respectively disposed opposite to the adjacent first magnet 211 and second magnet 213.

[0020] When in use, after the coil 31 is energized, it interacts with the magnetic field generated by the first magnetic circuit assembly 21 and the second magnetic circuit assembly 22, causing the oscillator assembly 2 to vibrate under the support of the spring piece 4; when the driving electrical signal of the coil 31 is an alternating signal, the oscillator assembly 2 is subjected to an alternating force, causing the oscillator assembly 2 to reciprocate and generate vibration.

[0021] The linear vibration motor 100 of the embodiment of the present application comprises a shell 1, a vibrator assembly 2 accommodated in the shell 1 and a stator assembly 3, the vibrator assembly 2 is suspended in the shell 1, both sides of the vibrator assembly 2 are provided with electromagnetic damping members 5 along a first direction, the electromagnetic damping members 5 are fixed to the shell 1, the first direction is perpendicular to the vibration direction of the vibrator assembly 2; the vibrator assembly 2 comprises a first magnetic circuit assembly 21 and a second magnetic circuit assembly 22, the first magnetic circuit assembly 21 and the second magnetic circuit assembly 22 are arranged at intervals along the first direction, the stator assembly 3 comprises a coil 31 and a support 32 arranged between the first magnetic circuit assembly 21 and the second magnetic circuit assembly 22, the axis direction of the coil 31 is parallel to the first direction, thus, the embodiment of the present application adopts a double magnetic circuit structure (comprising the first magnetic circuit assembly 21 and the second magnetic circuit assembly 22), the double magnetic circuits jointly act on the coil 31, the magnetic field intensity is high, the Lorentz force received by the coil 31 is large, the vibration feedback intensity is strong, and the vibration quality is improved; the electromagnetic damping members 5 are arranged on both sides of the vibrator assembly 2 in the shell 1, thus the electromagnetic damping members 5 are designed as two layers, the coil 31 fully utilizes the inside magnetic field of each magnetic circuit assembly, the electromagnetic damping members 5 fully utilize the outside magnetic field of each magnetic circuit assembly, so that the magnetic field utilization rate can be improved, the electromagnetic damping can be improved, and the braking response time can be shortened.

[0022] And, the first magnetic circuit assembly 21 and the second magnetic circuit assembly 22 each include a center magnet 212, first magnets 211 and second magnets 213 located on both sides of the center magnet 212 in the vibration direction, the magnetization directions of the adjacent first magnets 211 and the second magnets 213 are opposite and parallel to the first direction, the thicknesses of the first magnets 211 and the second magnets 213 in the first direction are each greater than the thickness of the center magnet 212, and the center of gravity of the center magnet 212 is farther away from the electromagnetic damping element 5 than the center of gravity of the first magnet 211 and the center of gravity of the second magnet 213, the magnetization direction of the center magnet 212 is parallel to the vibration direction, the polarities of the end portions of the center magnet 212 and the adjacent first magnets 211 and second magnets 213 are the same, the magnetization direction of the first magnet 211 of the first magnetic circuit assembly 21 is opposite to the magnetization direction of the first magnet 211 of the second magnetic circuit assembly 22, and the two drive sides of the coil 31 are respectively arranged opposite to the adjacent first magnets 211 and second magnets 213, so that the center magnet 212 in the first magnetic circuit assembly 21 and the second magnetic circuit assembly 22 can form a Halbach array with the first magnets 211 and the second magnets 213 on both sides, and such an array can converge magnetic field lines on one side of each magnetic circuit assembly, specifically, for converging magnetic field lines on the inside of each magnetic circuit assembly (i.e., the side close to the coil 31), thereby increasing the magnetic field strength of the part close to the coil 31, and further improving the driving force of the motor; at the same time, by making the thickness of the center magnet 212 smaller than the thicknesses of the first magnets 211 and the second magnets 213, and making it farther away from the electromagnetic damping element 5, the influence of the center magnet 212 on the magnetic field on the outside of each magnetic circuit assembly (i.e., the side close to the electromagnetic damping element 5) is reduced, thereby avoiding that the magnetic field strength on the side of the electromagnetic damping element 5 is too small, and avoiding poor damping effect caused by too few magnetic field lines passing through the electromagnetic damping element 5, i.e., the above-mentioned arrangement can also maintain the magnetic field on the side of each magnetic circuit assembly close to the electromagnetic damping element 5, and ensure the vibration feeling adjustment function of the electromagnetic damping element 5.

[0023] In some embodiments of the application, the vibrator assembly 2 further includes a cross beam 235 made of a non-magnetic material, the cross beam 235 is located between the adjacent first magnets 211 and the second magnets 213, and in the first direction, the cross beam 235 is arranged in a stack with the center magnet 212, and the cross beam 235 is located between the center magnet 212 and the electromagnetic damping element 5. In this embodiment, by arranging the cross beam 235 made of a non-magnetic material in the vibrator assembly 2 and between the first magnets 211 and the second magnets 213, on the one hand, the magnetic circuit assembly can be better fixed, and on the other hand, the space formed by the magnetic circuit assembly can be fully utilized to improve the mass of the vibrator assembly 2 without affecting the magnetic field of the magnetic circuit assembly, thereby reducing the displacement of the vibrator assembly 2 under the condition of unchanged driving force, i.e., the vibrator assembly 2 can provide a larger vibration feeling under a lower displacement, thereby reducing the risk of failure of the linear vibration motor 100 and improving the reliability of the linear vibration motor 100.

[0024] In some embodiments of the present application, the vibrator assembly 2 further comprises a mass block 23, the mass block 23 is provided with a first accommodating hole 231 penetrating through in the first direction, a crossbeam 235 is located in the first accommodating hole 231 and separates the first accommodating hole 231 into at least two cavities, the first magnet 211 and the second magnet 213 are respectively embedded in the two cavities, and the crossbeam 235 is integrally formed with the mass block 23. In this way, the mass of the vibrator assembly 2 is further increased by providing the mass block 23, and the displacement of the vibrator assembly 2 is further reduced under the condition that the driving force is unchanged, that is, the vibrator assembly 2 can provide a larger vibration feeling under a lower displacement, thereby reducing the risk of failure of the linear vibration motor 100 and improving the reliability of the linear vibration motor 100. At the same time, the through hole separating the first accommodating hole 231 into at least two cavities by the crossbeam 235 is provided on the mass block 23, and the magnetic circuit assembly is accommodated through the through hole, so that the mass block 23 and the magnetic circuit assembly are assembled together. In addition, the crossbeam 235 is integrally formed with the mass block 23, which not only can better fix the magnetic circuit assembly, but also can save the forming steps of the crossbeam 235 and the mass block 23, save the assembly time, and improve the processing efficiency of the linear vibration motor 100.

[0025] In some embodiments of the present application, the mass block 23 is provided with a second accommodating hole 232 penetrating through in the second direction, the second direction is perpendicular to the first direction and the vibration direction, so that the mass block 23 forms a first fixing part 236 and a second fixing part 237 arranged at intervals in the first direction, the first magnetic circuit assembly 21 is fixed to the first fixing part 236, and the second magnetic circuit assembly 22 is fixed to the second fixing part 237; the coil 31 and the support 32 are both provided through in the second accommodating hole 232, and the support 32 is fixed to the shell 1 through the second accommodating hole 232. In this way, the reasonable arrangement of the double magnetic circuit structure is realized by better structural design of the mass block 23 in the case of flat coil, which is convenient for improving the magnetic field strength and obtaining larger driving force.

[0026] In some embodiments of the present application, in each magnetic circuit assembly, the center magnet 212 and the second magnet 213 are both two, along the vibration direction, the first magnet 211 is located between the two center magnets 212, and the two second magnets 213 are located on the two sides of the two center magnets 212; the coil 31 is two, the two coils 31 are adjacent to each other, and the two driving edges of the two coils 31 are arranged opposite to the first magnet 211 of each magnetic circuit assembly, and the other two driving edges of the two coils 31 are arranged opposite to the two second magnets 213 of each magnetic circuit assembly. It can be understood that in each magnetic circuit assembly, the number of crossbeams 235 and center magnets 212 is the same, which is two, at this time, in the embodiment shown in the figure, the crossbeam 235 separates the accommodating hole 231 into three cavities, the first magnet 211 is embedded in the middle cavity, and the two second magnets 213 are embedded in the two cavities on the two sides respectively; in each magnetic circuit assembly, each center magnet 212 and the first magnet 211 and the second magnet 213 on the two sides form a Halbach structure respectively, which further improves the magnetic field strength and improves the driving force of the motor, and the two Halbach structures share the first magnet 211, at this time, the width of the first magnet 211 can be larger, that is, the width of the first magnet 211 can be 2 times the width of the second magnet 213. In this way, the embodiment of the present application adopts a double-coil double-magnetic-circuit structure, the upper and lower magnetic circuits simultaneously act on the double coil to realize bidirectional symmetric driving force, improve the vibration quality, and the symmetric distribution of the left and right double coils cooperates with the upper and lower double magnets to form a closed magnetic circuit to reduce magnetic leakage.

[0027] In some embodiments of the present application, along the vibration direction of the oscillator assembly 2, the width of the crossbeam 235 is equal to the width of the center magnet 212, in this way, the crossbeam 235 can serve as a positioning reference for the first magnet 211 and the second magnet 213, ensuring the positional accuracy of the first magnetic circuit assembly 21 and the second magnetic circuit assembly 22, and improving the assembly efficiency; along the vibration direction of the oscillator assembly 2, the width of the center magnet 212 can be smaller than the width of the first magnet 211 and the second magnet 213, to better adapt to the shape of the coil 31, so that more magnetic induction lines pass through the coil 31, further improving the utilization rate of the magnetic circuit; along the first direction, the height of the first magnet 211 and the second magnet 213 is the same, the height of the crossbeam 235 and the center magnet 212 is equal to the height of the first magnet 211, which facilitates the positioning and alignment of each magnet, and further improves the assembly efficiency; along the first direction, the height ratio of the crossbeam 235 to the center magnet 212 is 1:3-1:1, in this way, the height of the crossbeam 235 is relatively small, which can strengthen the magnetic field strength on the side of the first magnetic circuit assembly 21 and the second magnetic circuit assembly 22 towards the coil 31. Compared with the structure that the center magnet 212 is the same height as the first magnet 211 and the second magnet 213, the thinned center magnet 212 reduces the interference with the magnetic field strength on the side of the first magnetic circuit assembly 21 and the second magnetic circuit assembly 22 towards the electromagnetic damping member 5, that is, the magnetic field strength on the side of the first magnetic circuit assembly 21 and the second magnetic circuit assembly 22 towards the electromagnetic damping member 5 is higher, further improving the utilization rate of the magnetic field and improving the vibration effect.

[0028] In some embodiments of the present application, the cross beam 235 can be made of a non-magnetic material, which can be stainless steel, copper, aluminum, plastic, ceramic, etc., which is not limited herein. In this way, the cross beam 235 can be magnetized, which will not affect the magnetic field strength, thereby ensuring the vibration accuracy and making the vibration feedback more consistent. Specifically, the cross beam 235 and the mass block 23 can be integrally formed, which saves assembly time and improves the processing efficiency of the linear vibration motor 100.

[0029] In some embodiments of the present application, the cross beam 235 is flush with the side of the first magnet 211 and the second magnet 213 close to the electromagnetic damping member 5, which can facilitate the positioning and alignment of the first magnet 211 and the second magnet 213, improve the assembly efficiency, and the side of the mass block 23 close to the electromagnetic damping member 5 is flush with the side of the cross beam 235 close to the electromagnetic damping member 5, which avoids the interference between the mass block 23 and the electromagnetic damping member 5, thereby ensuring the vibration effect of the vibrator assembly 2; the first mass block 23 is provided with a first avoiding slot 233 in the middle of the two sides along the first direction, and the electromagnetic damping member 5 is at least partially located in the first avoiding slot 233, the length of the electromagnetic damping member 5 along the vibration direction is less than the length of the first avoiding slot 233, so that the first avoiding slot 233 does not contact the electromagnetic damping member 5 during vibration, which can avoid interference between components and reduce the overall volume of the product, or the first avoiding slot 233 can contact the electromagnetic damping member 5 during vibration, and the first avoiding slot 233 simultaneously plays a limiting role.

[0030] In some embodiments of the present application, the electromagnetic damping member 5 is a copper sheet, and the copper sheet has good temperature consistency as the electromagnetic damping scheme, and an alternating magnetic field is generated on the surface of the copper sheet during the reciprocating motion of the vibrator assembly 2, and the copper sheet generates electromagnetic damping for adjusting the motor performance. Further, the bracket 32 can be a copper sheet, so that a three-layer copper sheet design is formed, which can maximize the application of effective magnetic field, improve the electromagnetic damping, and shorten the braking response time; the bracket 32 is not only a damper but also a carrier of the coil 31, which saves motor space, improves space utilization, and improves product competitiveness.

[0031] In some embodiments of the present application, along the vibration direction of the vibrator assembly 2, the two side walls of the mass block 23 and the shell 1 are both provided with elastic sheets 4 for supporting the vibrator assembly 2, one end of the elastic sheet 4 is fixed to the mass block 23, and the other end of the elastic sheet 4 is fixed to the shell 1, so that the elastic sheet 4 is stably fixed between the mass block 23 and the shell 1, and provides stable elastic support for the vibrator assembly 2. Further, the elastic sheet 4 can be a V-shaped elastic sheet, and the opening directions of the two V-shaped elastic sheets are opposite, that is, the two elastic sheets 4 are centrally symmetrically arranged, so that the vibrator assembly 2 can be stably suspended in the shell 1, and the support force is more uniform.

[0032] In some embodiments of the present application, the shell 1 comprises a lower shell 12 and a dish-shaped upper shell covering the lower shell 12. Both the upper shell 11 and the lower shell 12 can be made of magnetic conductive material, so that the shell 1 can be used to adjust the magnetic field passing through the electromagnetic damping member 5, thereby improving the consistency of the vibration of the linear vibration motor 100. At this time, the electromagnetic damping member 5 is fixed (such as adhesively fixed) to the upper shell 11 and the lower shell 12, respectively. The bracket 32 can include a main body portion 321 supporting the coil 31, and the main body portion 321 is provided with a bending portion 322 on both sides along the second direction, and the bending portion 322 is fixed (specifically, can be welded) to the side wall of the upper shell 11. The side surface of the mass 23 is also provided with a second avoiding groove 234 avoiding the bending portion 322, so that the coil 31 is conveniently installed and fixed, and the fixing effect is good. The lower shell 12 can also be provided with an FPC (not shown in the figure), and the FPC is electrically connected to the coil 31. The FPC can make the coil 31 connected to the external circuit, thereby providing alternating current for the coil 31. In addition, the side surface of the upper shell 11 parallel to the vibration direction of the vibrator assembly 2 can be provided with a third avoiding groove 111 to facilitate the lead-out connection of the FPC. In the embodiment shown in the figure, five magnets are adhesively fixed on the mass 23 on the upper and lower parts, respectively, to form a symmetrical magnetic circuit structure, and to form the vibrator assembly 2; two coils 31 are fixed in the middle layer space of the mass 23 with a copper sheet (i.e. the bracket 32) as a carrier, and the whole forms the stator assembly 3; another two copper sheets (i.e. the electromagnetic damping member 5) are adhesively fixed on the inner sides of the upper shell 11 and the lower shell 12, respectively, corresponding to the magnetic circuit; the vibrator assembly 2 is integrally connected with the shell 1 through the elastic connecting member, i.e. the elastic sheet 4, and is suspended on the inner side of the shell 1, and the vibrator assembly 2 leaves a vibration gap between the coil 31 and the copper sheet.

[0033] On the other hand, the present application provides an electronic device comprising the linear vibration motor 100 described above. The structure of the linear vibration motor 100 is the same as above, and will not be described again here. The electronic device can be a mobile phone, a watch, a tablet computer, a smart wearable device, a virtual reality device or an augmented reality device, etc.

[0034] Since the electronic device of the present application applies all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the above-mentioned technical solutions, which will not be described again here.

[0035] In the description of the application, it is necessary to understand that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the features defined as "first", "second" can be explicitly or implicitly include one or more of the features. In the description of the application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0036] In the description of the application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be the communication between two components. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0037] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0038] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A linear vibration motor, characterized by, The application relates to a vibrator assembly, which comprises a shell, a vibrator assembly and a stator assembly, wherein the vibrator assembly is suspended in the shell. In the first direction, both sides of the vibrator assembly are provided with electromagnetic damping members, which are fixed to the shell, and the first direction is perpendicular to the vibration direction of the vibrator assembly. The vibrator assembly comprises a first magnetic circuit assembly and a second magnetic circuit assembly, which are arranged in the first direction, and each of the first magnetic circuit assembly and the second magnetic circuit assembly comprises a center magnet, first magnets and second magnets arranged on both sides of the center magnet in the vibration direction, the magnetization directions of the adjacent first magnets and second magnets are opposite and parallel to the first direction, the thicknesses of the first magnets and the second magnets are greater than the thickness of the center magnet in the first direction, and the gravity center of the center magnet is farther away from the electromagnetic damping members than the gravity centers of the first magnets and the second magnets, the magnetization direction of the center magnet is parallel to the vibration direction, the polarities of the end portions of the center magnet and the adjacent first magnets and second magnets are the same, and the magnetization directions of the first magnets of the first magnetic circuit assembly and the first magnets of the second magnetic circuit assembly are opposite. The stator assembly comprises a coil and a support arranged between the first magnetic circuit assembly and the second magnetic circuit assembly, the axis direction of the coil is parallel to the first direction, and the two driving edges of the coil are arranged opposite to the adjacent first magnets and second magnets.

2. The linear vibration motor of claim 1, wherein, The vibrator assembly further comprises a crossbeam made of a non-magnetic material, which is arranged between the adjacent first magnets and second magnets, and the crossbeam is arranged opposite to the center magnet in the first direction and between the center magnet and the electromagnetic damping members.

3. The linear vibration motor of claim 2, wherein, The vibrator assembly further comprises a mass block, which is provided with a first accommodating hole in the first direction, the crossbeam is arranged in the first accommodating hole and separates the accommodating hole into at least two cavities, the first magnets and the second magnets are embedded in the two cavities respectively, and the crossbeam is integrally formed with the mass block.

4. The linear vibration motor of claim 3, wherein, The mass block is provided with a second accommodating hole in a second direction, the second direction is perpendicular to the first direction and the vibration direction, so that the mass block forms a first fixing portion and a second fixing portion arranged in the first direction, the first magnetic circuit assembly is fixed to the first fixing portion, the second magnetic circuit assembly is fixed to the second fixing portion, the coil and the support are arranged in the second accommodating hole, and the support is fixed to the shell through the second accommodating hole.

5. Linear vibration motor according to any of claims 1-4, characterized in that, The center magnets and the second magnets are both two, the first magnet is located between the two center magnets along the vibration direction, and the two second magnets are located on the two sides of the two center magnets; the coils are two, two driving edges of the two coils are arranged opposite to the first magnet of each magnetic circuit assembly, and the other two driving edges of the two coils are arranged opposite to the two second magnets of each magnetic circuit assembly.

6. The linear vibration motor of claim 2, wherein, Along the vibration direction, the width of the cross beam is equal to the width of the center magnet, and the width of the center magnet is smaller than the width of the first magnet and the second magnet; And / or, along the first direction, the height of the first magnet and the second magnet is the same, and the sum of the height of the cross beam and the center magnet is equal to the height of the first magnet; And / or, along the first direction, the height ratio of the cross beam to the center magnet is 1:3-1:

1.

7. The linear vibration motor of claim 2, wherein, The cross beam is flush with the side of the first magnet and the second magnet close to the electromagnetic damping piece; And / or, the mass block is provided with a first avoiding groove in the middle of the two sides along the first direction, the electromagnetic damping piece is at least partially located in the first avoiding groove, and the length of the electromagnetic damping piece along the vibration direction is smaller than the length of the first avoiding groove.

8. The linear vibration motor of claim 1, wherein, The electromagnetic damping piece and / or the bracket is a copper sheet.

9. The linear vibration motor of claim 4, wherein, The shell comprises a lower shell and a dish-shaped upper shell covering the lower shell, wherein: The bracket comprises a main body portion supporting the coil, the main body portion is provided with a bending portion on both sides along the second direction, the bending portion is fixed to the side wall of the upper shell, and the side surface of the mass block is provided with a second avoiding groove avoiding the bending portion; And / or, the upper shell is provided with a third avoiding groove parallel to the side surface along the vibration direction; And / or, the electromagnetic damping piece is fixed to the upper shell and the lower shell respectively.

10. An electronic device, comprising: The linear vibration motor comprises the linear vibration motor according to any one of claims 1-9.

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