Linear vibration motor

Abstract

The utility model relates to the technical field of vibration motors, and discloses a linear vibration motor, which comprises a shell, a stator assembly, a rotor assembly and an elastic piece, the shell comprises a cylindrical middle frame with openings at two ends and end covers which are matched and buckled with the openings at the two ends to form an accommodating space, and the stator assembly is matched and fixed with the inner wall of the middle frame. The mover assemblies penetrate through the stator assembly at intervals and are elastically suspended in the accommodating space through elastic pieces connected with the two ends of the mover assemblies; the elastic piece comprises an inner ring, an outer ring and a spiral elastic arm connected between the inner ring and the outer ring; the outer ring is matched with the middle frame in shape and is clamped between the middle frame and the end cover; positioning holes are formed in the inner ring, at least two second positioning notches are symmetrically formed in the outer side edge of the outer ring, first positioning notches corresponding to the second positioning notches are formed in the end cover, and first limiting protrusions corresponding to the first positioning notches and the second positioning notches are arranged at the free ends of the two sides of the shell in a matched mode. The vibration motor is convenient to assemble and high in reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to vibration motor technical field, especially a linear vibration motor. BACKGROUND

[0002] With the development of electronic technology, portable consumer electronics has gradually occupied the global consumer market, such as mobile phones, palm game consoles, multimedia entertainment devices, etc. These electronic products generally use linear vibration motors for haptic feedback, such as incoming call prompts on mobile phones, vibration feedback on game consoles, etc. To meet such a wide range of applications, linear vibration motors are increasingly required to be smaller and have better vibration performance.

[0003] The existing linear vibration motor generally has a horizontal linear vibration motor (not shown), including a ring-shaped shell with two open ends, a cover body buckled on the two open ends of the shell, a mover assembly, a stator assembly, and an elastic member. The elastic member connects the two sides of the mover assembly at one end and connects the inner wall of the shell at the other end, thereby suspending the mover assembly in the shell. The stator assembly is fixed to the inner surface of the shell. The shell and the cover body are buckled to form a containing space. The mover assembly and the stator assembly are spaced apart and placed in the containing space. The electromagnetic induction principle and the elastic force of the elastic member are used to reset the reciprocating motion of the mover assembly to generate vibration. However, the assembly of the shell, cover body, elastic member, and mover assembly is inconvenient to install due to the difficulty in positioning between them, affecting the production efficiency and reliability of the vibration motor. Therefore, there is an urgent need for a new vibration motor that is easy to assemble and has high reliability to solve the technical problems of production efficiency and reliability of existing vibration motors. SUMMARY

[0004] The utility model aims at providing a linear vibration motor that is easy to assemble and has high reliability. The specific technical solution is as follows:

[0005] A linear vibration motor includes a housing, a stator assembly, a mover assembly, and an elastic member. The housing includes a cylindrical middle frame with two open ends and an end cover that fits and buckles to form a containing space. The stator assembly fits and is fixed to the inner wall of the middle frame. The mover assembly is spaced apart and penetrates the stator assembly and is elastically suspended in the containing space by the elastic member connecting its two ends. The elastic member includes an inner ring, an outer ring, and a spiral elastic arm connected between the inner ring and the outer ring. The outer shape of the outer ring fits the middle frame and is clamped between the middle frame and the end cover. The inner ring has a positioning hole. The outer side edge of the outer ring has at least two symmetric second positioning notches. The end cover has a first positioning notch corresponding to the second positioning notch. The two free ends of the housing have a first limiting protrusion corresponding to the first and second positioning notches.

[0006] Preferably, the stator assembly comprises a flexible circuit board, a coil, positioning rings fixed on both sides of the coil, and a support fixed on the outer surface of the end cover; the flexible circuit board comprises an internal electrical connection end and an external electrical connection end, the external electrical connection end passes through the elastic member and the end cover to the accommodating space, and the support is fixed on the outer surface of the end cover.

[0007] Preferably, the middle frame comprises symmetrical two-side plane portions and two-side curved portions, the first limiting protrusions are located at the two-side free ends of the curved portions, a first through hole is arranged at the middle position of the curved portion, and first openings are symmetrically arranged at the two-side free ends of the curved portion and the plane portion respectively; the first openings at the two-side free ends of the curved portion are in the same straight line with the center of the first through hole.

[0008] Preferably, the end cover comprises a circular body and a flange formed by bending and extending from the periphery of the body, the periphery of the flange is provided with the first positioning notch corresponding to the second positioning notch, and a first groove is arranged corresponding to the external electrical connection end passing out of the accommodating space; the outer ring is clamped between the middle frame and the flange.

[0009] Preferably, the inner surface of the body is fixed with a damping member.

[0010] Preferably, the elastic member is provided with a second groove corresponding to the external electrical connection end passing out of the accommodating space.

[0011] Preferably, the first openings at the free ends of the plane portions are respectively arranged corresponding to the first groove and the second groove.

[0012] Preferably, the mover assembly comprises a magnetic assembly, a mass fixedly attached to both sides of the magnetic assembly, and a connecting member connected to the elastic member.

[0013] Preferably, the magnetic assembly comprises a pole piece and permanent magnets fixedly attached to both sides of the pole piece; the mass is provided with a second through hole passing through the center; one end of the connecting member is inserted into the second through hole and fixedly connected with the permanent magnets, the other end of the connecting member passes out of the second through hole and is fixedly connected with the elastic member; a second limiting protrusion is protruded on the end face of the other end of the connecting member and is matched with the positioning hole.

[0014] Compared with the prior art, the linear vibration motor is easy to assemble, the positioning of assembly is realized by the limiting hole of the elastic member and the second limiting protrusion of the mover assembly, the positioning of assembly is realized by the first limiting protrusions of the middle frame and the first positioning notch of the end cover and the second positioning notch of the elastic member respectively, the assembly of the shell, the elastic member and the mover assembly is convenient, and the mechanical reliability of the vibration motor is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is an assembled perspective view of the linear vibration motor.

[0016] Figure 2 is a sectional view of the linear vibration motor in the vibration direction.

[0017] Figure 3 is an exploded view of the structure of the linear vibration motor.

[0018] Figure 4 is an assembled view of the shell and the elastic member.

[0019] Figure 5 is a front view of the elastic member.

[0020] Figure 6 is a perspective view of the end cover.

[0021] Figure 7 is an exploded view of the structure of the mover assembly.

[0022] wherein:

[0023] 100 - shell;

[0024] 1 - middle frame; 10 - first limiting protrusion; 11 - first through hole; 12 - first opening;

[0025] 2 - end cover; 20 - bottom wall; 21 - flange; 210 - first positioning notch; 211 - first groove;

[0026] 3 - mover assembly; 30 - permanent magnet; 31 - magnetic conducting sheet; 32 - mass block; 320 - second through hole; 33 - connecting member;

[0027] 330 - second limiting protrusion;

[0028] 4 - stator assembly; 40 - flexible circuit board; 400 - support plate; 41 - coil; 410 - fixing ring;

[0029] 5 - elastic member; 50 - inner ring; 500 - limiting hole; 51 - outer ring; 510 - second positioning notch;

[0030] 511 - second groove;

[0031] 6 - damping member. DETAILED DESCRIPTION

[0032] Clearly, the described embodiments are merely a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0033] The structure of the linear vibration motor of the present application is shown in Figures 1 to 4 The shell 100 comprises a cylindrical middle frame 1 with two open ends (not indicated) and end covers 2 adapted to be buckled to the two open ends to form a containing space; the stator assembly 3 is adapted to and fixed to the inner wall (not indicated) of the middle frame 1; the mover assembly 4 is spaced through the stator assembly 3 and elastically suspended in the containing space through the elastic member 5 connecting the two ends thereof. The elastic member 5 comprises an inner ring 50, an outer ring 51 and a spiral elastic arm 51 connected between the inner ring 50 and the outer ring 51; the outer shape of the outer ring 51 is adapted to the middle frame 1 and clamped between the middle frame 1 and the end cover 2; the inner ring 50 is provided with a positioning hole 500, and the outer side edge of the outer ring 51 is symmetrically provided with at least two second positioning notches 510, the end cover 2 is provided with a first positioning notch 210 corresponding to the second positioning notch 510, and the two free ends of the shell 1 are adapted to be provided with a first limiting protrusion 10 corresponding to the first positioning notch 210 and the second positioning notch 510.

[0034] The middle frame 1 comprises symmetrical two side plane parts (not indicated) and two side curved parts (not indicated), the first limiting protrusion 10 is located at the two free ends of the curved parts, the middle position of the curved parts is symmetrically provided with a first through hole 11, and the two free ends of the curved parts and the plane parts are symmetrically provided with a first opening 12; the first opening 12 of the two free ends of the curved parts is on the same straight line with the center of the first through hole 11.

[0035] The stator assembly 4 comprises a flexible circuit board 40, a coil 41, a positioning ring 410 fixed to the two sides of the coil 41 and a support member 400 fixed to the outer surface of the end cover 2; the coil 41 and the positioning ring 410 are fixed to the inner wall of the middle frame 1, and the position of the coil 41 and the positioning ring 410 can be adjusted through the first through hole 11 and the first opening 12 of the middle frame; the flexible circuit board 40 comprises an internal power connection end (not indicated) and an external power connection end (not indicated), the internal power connection end is limited to the positioning ring 410 and electrically connected with the coil 41, and the external power connection end (not indicated) is led out of the containing space along the inner wall of the middle frame 1 through the elastic member 5 and the end cover 2; the support member 400 fixes the external power connection end to the outer surface of the end cover 2.

[0036] The end cover 2 comprises a circular body 20, a flange 21 bent and extended from the periphery of the body 20, a damping member 6 fixed to the inner surface of the body 20, the damping member 6 being located between the end cover 2 and the elastic member 5 to buffer the collision between the elastic member 5 and the end cover 2, thereby improving the mechanical reliability of the vibration motor, the periphery of the flange 21 is provided with a first positioning notch 210 corresponding to a second positioning notch 510 of the outer ring 51, the outer ring 51 is clamped between the middle frame 1 and the flange 21, the first limiting protrusion 10 of the middle frame 1 is matched with the first positioning notch 210 of the end cover 2 and the second positioning notch 510 of the elastic member 5 respectively, thereby realizing the positioning of the housing 100 and the elastic member 5 in the vibration direction and the circumferential direction of the vibration motor, the periphery of the flange 21 is provided with a first groove 211 corresponding to the external power connection end of the protruding accommodation space, the elastic member 5 is provided with a second groove 511 corresponding to the external power connection end of the protruding accommodation space, and the first opening 12 of the free end of the flat portion is correspondingly provided with the first groove 211 and the second groove 511 to provide a passage for the external power connection end of the protruding accommodation space.

[0037] The rotor assembly 3 comprises a magnetic assembly (not labeled), a mass block 32 fixedly attached to both sides of the magnetic assembly, and a connecting member 33 connected to the elastic member 5; the magnetic assembly comprises a pole piece 30 and permanent magnets 31 fixedly attached to both sides of the pole piece 30; the mass block 32 is provided with a second through hole 320 in the center; one end of the connecting member 33 is inserted into the second through hole 320 and connected and fixed with the permanent magnets 31, the other end of the connecting member 33 protrudes out of the second through hole 320 and is connected and fixed with the elastic member 5, the connecting member 33 is inserted into the second through hole 320 of the mass block 32 and abuts against the permanent magnets 31, which can increase the contact area of the connecting member 33 with the magnetic assembly and the mass block 32, and enhance the connection strength of the connecting member 33 with the magnetic assembly and the mass block 32 respectively; the other end of the connecting member 33 is provided with a second limiting protrusion 330 protruding from the end face and matched with the positioning hole 500 of the elastic member 5, the height of the second limiting protrusion 330 is consistent with the thickness of the inner ring 50, and the second limiting protrusion 330 is embedded in the positioning hole 500, thereby realizing the positioning of the rotor assembly 3 and the elastic member 5 in the vibration direction and the circumferential direction of the vibration motor.

[0038] The utility model provides a linear vibration motor, coil 41 is opposite fixed with middle frame 1, is used for driving the vibration of rotor subassembly 3, specifically, coil 41 can produce the electromagnetic field of variation after alternating current is led in, the electromagnetic field can drive rotor subassembly 3 to vibrate after the interaction of the magnetic field of rotor subassembly 3.In the deviation of rotor subassembly 3 from the equilibrium position, elastic part 5 occurs elastic deformation, can provide the elastic force of bringing rotor subassembly 3 back to the equilibrium position, drives rotor subassembly 3 reset, in the utility model, linear vibration motor realizes the positioning of assembly through the limiting hole 500 of elastic part 5 and the second limiting protrusion 330 of rotor subassembly 3, realizes the positioning of assembly through the first limiting protrusion 10 of middle frame 1 respectively with end cover 2 first positioning gap 210 and the second positioning gap 510 of elastic part 5, make the assembly and welding of shell 100, elastic part 5 and rotor subassembly 3 more convenient, to improve the stability and mechanical reliability of linear vibration motor assembly, use.

[0039] Need to explain, in the description of the utility model, the terms "upper", "lower", "front", "rear", "left", "horizontal direction", "vertical direction" etc. the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore can not be understood as limiting the utility model.

[0040] Although the embodiments of the utility model have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A linear vibration motor comprising a housing, a stator assembly, a mover assembly, and a resilient member, characterized by, The shell comprises a cylindrical middle frame with two open ends and an end cover adapted to be buckled to the two open ends to form a containing space, the stator assembly is adapted and fixed to the inner wall of the middle frame, the mover assembly is spaced through the stator assembly and elastically suspended in the containing space by the elastic member connecting two ends thereof; the elastic member comprises an inner ring, an outer ring and a spiral elastic arm connected between the inner ring and the outer ring; the outer shape of the outer ring is adapted to the middle frame and clamped between the middle frame and the end cover; the inner ring is provided with a positioning hole, the outer side edge of the outer ring is provided with at least two symmetric second positioning notches, the end cover is provided with a first positioning notch corresponding to the second positioning notch, and the two free ends of the shell are provided with a first limiting protrusion corresponding to the first positioning notch and the second positioning notch.

2. The linear vibration motor of claim 1, wherein, The stator assembly comprises a flexible circuit board, a coil and a positioning ring fixed to two sides of the coil and a support fixed to the outer surface of the end cover; the flexible circuit board comprises an internal power terminal and an external power terminal, the external power terminal is led out of the containing space from the inner wall of the middle frame through the elastic member and the end cover, and the support fixes the external power terminal to the outer surface of the end cover.

3. The linear vibration motor of claim 2, wherein, The middle frame comprises symmetric two side plane parts and two side curved parts, the first limiting protrusion is located at the two free ends of the curved parts, a first through hole is arranged at the middle position of the curved part, and the two free ends of the curved part and the two free ends of the plane part are respectively provided with a first opening; the first opening of the two free ends of the curved part is on the same straight line with the center of the first through hole.

4. The linear vibration motor of claim 3, wherein, The end cover comprises a circular body and a flange bent and extended from the periphery of the body, the periphery of the flange is provided with the first positioning notch corresponding to the second positioning notch, and a first groove is arranged corresponding to the external power terminal led out of the containing space; the outer ring is clamped between the middle frame and the flange.

5. The linear vibration motor of claim 4, wherein, The inner surface of the body is fixed with a damping member.

6. The linear vibration motor of claim 5, wherein, The elastic member is provided with a second groove corresponding to the external power terminal led out of the containing space.

7. The linear vibration motor of claim 6, wherein, The first openings of the free ends of the plane parts are respectively arranged corresponding to the first groove and the second groove.

8. The linear vibration motor of claim 7, wherein, The mover assembly comprises a magnetic assembly, a mass block fixedly attached to two sides of the magnetic assembly and a connecting member connected to the elastic member.

9. The linear vibration motor of claim 8, wherein, The magnetic assembly comprises a pole piece and a permanent magnet fixedly attached to two sides of the pole piece; the mass block is provided with a second through hole in the center; one end of the connecting member is inserted into the second through hole and fixedly connected with the permanent magnet, the other end of the connecting member is led out of the second through hole and fixedly connected with the elastic member; a second limiting protrusion is protruded on the end face of the other end of the connecting member and adapted to the positioning hole.

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