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 buckled at the openings at the two ends to form an accommodating space, the stator assembly is matched and fixed with the inner wall of the middle frame, and the rotor assembly is fixed with the inner wall of the middle frame. The mover assembly penetrates through the stator assembly at intervals and is elastically suspended in the accommodating space through the elastic pieces connected with the two ends of the mover assembly; the stator assembly comprises a winding assembly and a circuit board assembly, and the winding assembly comprises a coil and positioning rings clamped on the two sides of the coil. The circuit board assembly comprises a first flexible circuit board, a supporting plate and a second flexible circuit board which is electrically connected with the first flexible circuit board and fixed to the outer wall of the end cover through the supporting plate. The vibration motor is simple and compact in structure and good in vibration performance.

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, touch pens, 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 touch pens, etc. To meet such a wide range of applications, linear vibration motors are required to be smaller and have better vibration performance.

[0003] The existing linear vibration motor linear vibration motor supports the movable member with a magnet and a weight by a spring to reciprocating vibration, and applies alternating current with the same frequency as the natural vibration frequency of the spring and the movable member to the fixed coil, thereby applying a driving force for reciprocating vibration to the magnet. However, the positioning and fixing accuracy of the coil is not high and the structure is complex, resulting in low reliability. Therefore, there is an urgent need for a new vibration motor with a simple structure to solve the technical problems of existing vibration motors. SUMMARY

[0004] The utility model aims at providing a linear vibration motor with simple structure, compactness and good vibration performance, and the specific technical scheme is as follows:

[0005] A linear vibration motor includes a housing, a stator assembly, a rotor assembly, and an elastic member. The housing includes a cylindrical middle frame with two open ends and end covers that are buckled to form a containing space at the two open ends. The stator assembly is adapted and fixed to the inner wall of the middle frame. The rotor assembly is spaced through the stator assembly and is elastically suspended in the containing space by the elastic member connecting its two ends. The stator assembly includes a winding assembly and a circuit board assembly. The winding assembly includes a coil and a positioning ring clamped on both sides of the coil. The circuit board assembly includes a first flexible circuit board, a support plate, and a second flexible circuit board electrically connected to the first flexible circuit board and fixed to the outer wall of the end cover through the support plate.

[0006] Preferably, the first flexible circuit board includes an internal power connection end and an external power connection end. The second flexible circuit board includes a joint end and a power supply end. The external power connection end extends to the outer wall of the end cover and is electrically connected to the joint end and fixed on the support plate.

[0007] Preferably, the support plate is L-shaped, and the second flexible circuit board is L-shaped and is adapted and fixed to the support plate.

[0008] Preferably, the positioning ring is provided with a groove corresponding to the inner electrical terminal, the inner electrical terminal is accommodated in the groove and electrically connected with the coil.

[0009] Preferably, the elastic member and the end cover are respectively provided with a first avoiding opening and a second avoiding opening corresponding to the groove.

[0010] Preferably, the middle frame is provided with at least three through holes corresponding to the stator assembly, and the centers of the through holes are on the same straight line.

[0011] Preferably, the mover assembly comprises a magnetic assembly, a mass clamped on both sides of the magnetic assembly, and a connecting piece with one end fixedly connected with the magnetic assembly and the mass and the other end fixedly connected with the elastic member.

[0012] Preferably, the magnetic assembly comprises two permanent magnets and a magnetic conducting sheet clamped between the permanent magnets.

[0013] Preferably, the magnetic assembly is spaced apart from the coil.

[0014] Preferably, the damping member is further fixed on the inner surface of the end cover, and the damping member is located between the end cover and the elastic member.

[0015] Compared with the prior art, the stator assembly of the vibration motor can be accurately positioned and installed, so that the structure of the vibration motor is simple and easy to install, and the reliability and vibration performance of the vibration motor are improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is an assembled perspective view of a linear vibration motor.

[0017] Figure 2 is an exploded view of the structure of a linear vibration motor.

[0018] Figure 3 is a sectional view of the linear vibration motor along the vibration direction

[0019] Figure 4 is an exploded view of the structure of the mover assembly.

[0020] Figure 5 is an exploded view of the structure of the circuit board assembly.

[0021] Figure 6 is an exploded view of the structure of the winding assembly.

[0022] Wherein:

[0023] 100 - shell; 1 - middle frame; 10 - through hole; 2 - end cover; 20 - second notch;

[0024] 3-Motor assembly; 30-Permanent magnet; 31-Magnetic conductor sheet; 32-Mass block; 33-Connector;

[0025] 4-Stator assembly; 40-Circuit board assembly; 401-Support plate; 402-First flexible circuit board;

[0026] 4020 - Internal power terminal; 4021 - External power terminal; 403 - Second flexible circuit board; 4030 - Joint terminal;

[0027] 4031 - Power supply terminal; 41 - Winding assembly; 410 - Coil; 411 - Positioning ring; 4110 - Groove;

[0028] 5-Elastic element; 50-First notch;

[0029] 6-Damping components. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] The structure of a linear vibration motor according to this utility model is as follows: Figures 1 to 6 As shown, the device includes a housing 100, a mover assembly 3, a stator assembly 4, an elastic element 5, and a damping element 6. The housing 100 includes a cylindrical inner frame 1 with openings at both ends (not shown) and an end cap 2 that is fastened to the openings at both ends to form an accommodating space. The stator assembly 4 is adapted to and fixed to the inner wall of the inner frame 1. The inner frame 1 is provided with at least three through holes 10 at intervals corresponding to the stator assembly 4. The center lines of the through holes 10 are on the same straight line. The position of the stator assembly 4 on the inner frame 1 can be monitored and adjusted through the through holes 10, thereby improving the mechanical reliability of the vibration motor. The mover assembly 3 passes through the stator assembly 4 at intervals and is elastically suspended in the accommodating space by the elastic element 5 connecting its two ends. The damping element 6 is fixed to the inner surface of the end cap 2. The damping element 6 is located between the end cap 2 and the elastic element 5 to buffer the collision between the elastic element 5 and the end cap 2, thereby improving the mechanical reliability of the vibration motor.

[0032] The mover assembly 3 comprises a magnetic assembly (not labeled), a mass 32 clamped on both sides of the magnetic assembly, and a connecting piece 33 fixed at one end with the magnetic assembly and the mass 32, and the other end of the connecting piece 33 is fixed with the elastic piece 5, wherein the magnetic assembly comprises two permanent magnets 30 and a magnetic conducting sheet 31 clamped between the permanent magnets 30, and the connecting piece 33 and the mass 32 adopt a riveting structure, and the connecting piece 33 is made of stainless steel to enhance the welding force of the connecting piece 33 and the elastic piece 5.

[0033] The stator assembly 4 comprises a circuit board assembly 40 and a winding assembly 41, the circuit board assembly 40 comprises a first flexible circuit board 402, a support plate 401, and a second flexible circuit board 403 electrically connected with the first flexible circuit board 402 and fixed on the outer wall of the end cover 2 through the support plate 401; the first flexible circuit board 402 comprises an internal electrical connection end 4020 and an external electrical connection end 4021, the second flexible circuit board 403 comprises a joint end 4030 and a power supply end 4031, the external electrical connection end 4021 extends to the outer wall of the end cover 2 and is electrically connected with the joint end 4030 and fixed on the support plate 401, in detail, the support plate 401 is L-shaped, and the second flexible circuit board 403 is L-shaped and fixed with the support plate 401; the winding assembly 41 comprises a coil 410 and a positioning ring 411 clamped on both sides of the coil 410, the positioning ring 411 is made of magnetic conductive material to reduce magnetic leakage, enhance the magnetic circuit, and improve the efficiency of the vibration motor, the positioning ring 411 is provided with a groove 4110 corresponding to the internal electrical connection end 4020, the positioning ring 411 is used to limit the position of the coil 410 and protect the coil 410, prevent the coil 410 from being impacted during the reciprocating motion of the mover assembly 3, thereby enhancing the reliability of the vibration motor, and the groove 4110 can also protect the lead wire (not shown) of the coil 410 and the internal electrical connection end 4020.

[0034] The linear vibration motor is assembled, the stator assembly 4 is spaced and surrounds the periphery of the mover assembly 3, the center line of the middle frame 1, the mover assembly 3 and the stator assembly 4 is on the same line and is symmetrically arranged up and down, and the center of the magnetic conducting sheet 31 is symmetrically arranged left and right in the vibration direction of the mover assembly 3, so that the magnetic field of the vibration motor is uniform and symmetrical, the stability of the mover assembly 3 in the reciprocating vibration process is guaranteed, and the vibration performance of the vibration motor is improved; the internal power connection end 4020 is accommodated in the groove 4110 and is electrically connected with the coil 410, the elastic member 5 and the end cover 2 correspondingly arranged first and second avoiding openings 50 and 20 are arranged in the groove 4110, the magnetic assembly and the coil 410 are correspondingly and spacedly arranged, the two permanent magnets 30 are arranged in a magnetic pole opposite structure, the adjacent two sides are N poles, and the outward two sides are S poles, the magnetic conducting sheet 31 between the permanent magnets 30 is arranged to optimize the magnetic circuit structure, the shell 100 is made of a magnetic conducting material to enhance the magnetism of the coil 410 after being electrified, when the coil 410 is electrified with alternating current, a changing magnetic field is generated, since the coil 410 is fixed on the shell 100, the magnetic assembly and the coil 410 have relative movement, so that the mover assembly 3 reciprocatingly vibrates when moving in the stress direction of the elastic member 5 along with the change of the magnetic field. In the utility model, the structure of the coil 410 and the permanent magnet 30 fully utilizes the internal accommodation space of the linear vibration motor, so that the overall structure of the linear vibration motor is simple, compact, and generates greater magnetic field force and driving force, the broadband capability of the vibration motor is improved, and stronger vibration feeling of the linear vibration motor is realized.

[0035] It should be noted that, in the description of the utility model, the terms "upper", "lower", "front", "rear", "left", "horizontal direction", "vertical direction" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or components referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0036] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and 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 end covers buckled to the two open ends to form a containing space, the stator assembly is fitted and fixed to the inner wall of the middle frame, the rotor assembly is spaced through the stator assembly and elastically suspended in the containing space by the elastic members connecting two ends thereof; the stator assembly comprises a winding assembly and a circuit board assembly, the winding assembly comprises a coil and positioning rings clamped on both sides of the coil, and the circuit board assembly comprises a first flexible circuit board, a support plate and a second flexible circuit board electrically connected to the first flexible circuit board and fixed to the outer wall of the end cover through the support plate.

2. The linear vibration motor of claim 1, wherein, The first flexible circuit board comprises internal and external electrical connection ends, the second flexible circuit board comprises a joint end and a power supply end, and the external electrical connection end extends to the outer wall of the end cover and is electrically connected to the joint end and fixed to the support plate.

3. The linear vibration motor of claim 2, wherein, The support plate is provided in an L shape, and the second flexible circuit board is also provided in an L shape and is fitted and fixed to the support plate.

4. The linear vibration motor of claim 2, wherein, The positioning ring is provided with a groove corresponding to the internal electrical connection end, and the internal electrical connection end is contained in the groove and electrically connected to the coil.

5. The linear vibration motor of claim 4, wherein, The elastic members are respectively provided with first and second avoiding openings corresponding to the grooves of the end cover.

6. The linear vibration motor of claim 1, wherein, The middle frame is provided with at least three through holes corresponding to the stator assembly, and the centers of the through holes are on the same straight line.

7. The linear vibration motor of claim 6, wherein, The rotor assembly comprises a magnetic assembly, a mass block clamped on both sides of the magnetic assembly and a connecting member fixed at one end to the magnetic assembly and the mass block, and the other end of the connecting member is fixed to the elastic member.

8. The linear vibration motor of claim 7, wherein, The magnetic assembly comprises two permanent magnets and a magnetic conducting sheet clamped between the permanent magnets.

9. The linear vibration motor of claim 8, wherein, The magnetic assembly is spaced apart corresponding to the coil.

10. The linear vibration motor of claim 1, wherein, A damping member is further fixed to the inner surface of the end cover, and the damping member is located between the end cover and the elastic member.

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