Linear vibration motor

Abstract

The utility model relates to the technical field of vibration motors, and discloses a linear vibration motor, which comprises an upper cover, a lower cover, a vibrator assembly, a stator assembly and an elastic piece, and is characterized in that the stator assembly comprises an upper annular support and a lower annular support which are split and symmetrically arranged, a magnetic conductive ring and a coil which are respectively fixed on the inner wall surfaces of the supports, and a circuit board fixed on the outer wall surfaces of the supports; the upper cover and the lower cover respectively cover the two ends of the support to form an accommodating space, and the vibrator assembly is elastically suspended in the accommodating space through the elastic pieces at the two ends of the vibrator assembly; a first annular mounting groove and a second annular mounting groove are oppositely and concavely formed in the inner wall surface of one side, far away from the upper cover and the lower cover, of the bracket, and plane mounting grooves are oppositely and concavely formed in the outer wall surface; the first mounting groove and the second mounting groove are radially communicated, and the second mounting groove is adjacent to the vibrator assembly; the magnetic conductive ring is embedded in the first installation groove, the coil is embedded in the second installation groove, and the circuit board is fixed in the plane installation groove. The vibration motor is simple in structure, convenient to assemble and high in vibration feedback performance.

Description

Technical Field

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

[0002] With the development of electronic technology, portable consumer electronics products have gradually occupied the global consumer market, such as mobile phones, handheld game consoles, navigation devices, and multimedia entertainment equipment. These electronic products generally use linear vibration motors for haptic feedback, such as incoming call alerts on mobile phones, navigation prompts, and vibration feedback on game consoles. To meet such a wide range of applications, the requirements for miniaturization and vibration performance of vibration motors are becoming increasingly stringent.

[0003] Traditional vibration motors achieve vibration feedback through a rotor and an eccentric hammer. The working principle involves an energized coil rotating in a magnetic field, causing the rotor to rotate. The rotor then rotates the eccentric hammer, transmitting the centrifugal force generated by the rotating eccentric hammer to the electronic device, thus producing vibration. However, the assembly process of traditional vibration motors is complex, making it difficult to meet the requirements for miniaturization and improved vibration performance.

[0004] Therefore, a new type of vibration motor is urgently needed to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a linear vibration motor with a simple structure, convenient assembly, and good vibration feedback performance. The specific technical solution is as follows:

[0006] A linear vibration motor includes an upper cover, a lower cover, an oscillator assembly, a stator assembly, and elastic elements. The stator assembly is cylindrical in shape and includes an annular support that is symmetrically arranged in upper and lower sections, a magnetic ring and a coil respectively fixed to the inner wall of the support, and a circuit board fixed to the outer wall of the support. The upper and lower covers respectively cover the two ends of the support to form accommodating spaces. The oscillator assembly is elastically suspended in the accommodating spaces by the elastic elements at both ends. The inner wall of the support away from the upper and lower covers has a first and a second annular mounting groove, and the outer wall has a planar mounting groove. The axial width of the first mounting groove is greater than the width of the second mounting groove. The first and second mounting grooves are radially connected. The second mounting groove is adjacent to the oscillator assembly. The magnetic ring is embedded in the first mounting groove, the coil is embedded in the second mounting groove, and the circuit board is fixed to the planar mounting groove.

[0007] Preferably, a first relief groove is recessed on an inner wall surface of one side edge of the bracket facing the upper cover and the lower cover, and a non-circular limiting convex ring and at least two separate limiting convex platforms are arranged on a free end surface of one side of the bracket facing the upper cover and the lower cover; two symmetrical first through grooves are arranged through the plane mounting groove; the height of the limiting convex platform is greater than that of the limiting convex ring.

[0008] Preferably, the magnetic conductive ring is provided with a second through groove corresponding to the first through groove.

[0009] Preferably, the elastic member includes an inner ring, an outer ring, and spiral elastic arms connected between the inner ring and the outer ring; the inner ring is connected to the oscillator assembly, and the outer ring is respectively clamped and fixed between the bracket, the upper cover and the lower cover.

[0010] Preferably, the shape of the outer ring is adapted to the limiting convex ring, and a first limiting notch is arranged on an outer edge of the outer ring corresponding to the limiting convex platform.

[0011] Preferably, the inner sides of the upper cover and the lower cover facing the bracket are symmetrically arranged, including a second relief groove recessed at a position corresponding to the elastic arm in the central part of the inner side, a limiting groove adapted to the limiting convex ring at the inner peripheral position, and a second limiting notch adapted to the limiting convex platform.

[0012] Preferably, the outer ring is clamped and fixed between the limiting convex ring and the limiting groove.

[0013] Preferably, an anti-fooling groove is arranged on an edge of an outer surface of the other side of the upper cover.

[0014] Preferably, the axial section of the oscillator assembly is in the shape of a Chinese character 'zhong', including a permanent magnet, magnetic conductive sheets symmetrically fixed on both sides of the permanent magnet, mass blocks symmetrically fixed on both sides of the magnetic conductive sheets, and a cylindrical connecting shaft that penetrates and connects and fixes the permanent magnet, the magnetic conductive sheets and the mass blocks; both ends of the connecting shaft are fixedly connected to the inner ring.

[0015] Preferably, the coil is arranged at an interval corresponding to the permanent magnet.

[0016] Compared with the prior art, the present utility model provides a linear vibration motor with a simple structure, convenient assembly and good vibration feedback performance. The separately arranged brackets are respectively combined with the upper cover and the lower cover, which is more convenient for the assembly of the stator assembly and the oscillator assembly; the arrangement of the double coils corresponding to the permanent magnet helps to generate a stronger magnetic field to achieve high electromagnetic force of the vibration motor; the magnetic conductive ring covered outside the coil and the magnetic conductive sheets pasted on both sides of the permanent magnet both play a role in concentrating magnetic lines of force and preventing magnetic leakage, thereby generating a higher driving force and improving the vibration feedback performance. Description of the Drawings

[0017] Figure 1This is a 3D assembly diagram of a linear vibration motor structure.

[0018] Figure 2 This is an exploded view of a linear vibration motor structure.

[0019] Figure 3 This is a 3D view of the top cover.

[0020] Figure 4 It is a 3D diagram of the support frame.

[0021] Figure 5 It is a 3D diagram of the assembly of the support and elastic components.

[0022] Figure 6 It is an exploded view of the structure of the support and elastic components.

[0023] Figure 7 It is along Figure 1 A cross-sectional view along line AA in the middle.

[0024] in:

[0025] 1 – Top cover; 1' – Bottom cover; 100 – First perforation;

[0026] 10 – Second clearance groove; 11 – Limiting groove; 12 – Second limiting notch; 13 – Anti-fooling groove;

[0027] 3-Oscillator assembly; 30-Permanent magnet; 31-Magnetic conductor sheet; 32-Mass block; 33-Connecting shaft;

[0028] 4-Stator assembly; 40-Bracket; 400-Second mounting slot; 401-First mounting slot; 402-First through slot;

[0029] 403-Flat mounting slot; 404-Limiting boss; 405-Limiting ring; 406-First clearance slot; 41-Coil; 42-Magnetic ring; 420-Second through slot; 43-Circuit board;

[0030] 5-Elastic element; 50-Outer ring; 51-Inner ring; 52-Elastic arm; 53-First limiting notch. Detailed Implementation

[0031] 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.

[0032] The structure of a linear vibration motor according to this utility model is as follows: Figures 1 to 7As shown, the linear vibration motor includes an upper cover 1, a lower cover 1', an oscillator assembly 3, a stator assembly 4, and an elastic element 5. The stator assembly 4 is cylindrical in shape and includes an annular support 40 that is symmetrically arranged in two parts. The upper cover 1 and the lower cover 1' respectively cover the two ends of the support 40 to form an accommodating space (not shown). The oscillator assembly 3 is elastically suspended in the accommodating space by the elastic elements 5 at both ends. When the linear vibration motor is working, an alternating current is supplied to the stator assembly 4 to generate a periodically changing magnetic field. The oscillator assembly 3 reciprocates within the accommodating space through the periodically changing magnetic force between the stator assembly 4 and the oscillator assembly 3, thereby realizing the vibration function of the linear vibration motor. When the linear vibration motor is not working, the power supply to the stator assembly 4 is stopped, and the oscillator assembly 3 is reset by the rebound force of the elastic element 5.

[0033] The stator assembly 4 also includes a magnetic ring 42 and a coil 41 fixed to the inner wall of the bracket 40, and a circuit board 43 fixed to the outer wall of the bracket 40. The inner wall of the bracket 40 away from the upper cover 1 and lower cover 1' has a first annular mounting groove 401 and a second mounting groove 400 respectively, and the outer wall has a planar mounting groove 403 respectively. The first mounting groove 401 and the second mounting groove 400 are radially connected. The second mounting groove 200 is adjacent to the vibrator assembly 3. The magnetic ring 42 is embedded in the first mounting groove 401, and the coil 41 is embedded in the second mounting groove 400. The vibrator assembly 3 is evenly spaced through the coil 41, making the distance between the coil 41 and the vibrator assembly 3 closer, ensuring that the vibration motor has a greater magnetic thrust, thereby improving the vibration motor's performance. The driving force of the vibration motor is increased. The circuit board 43 is fixed to the planar mounting groove 403. The axial width of the first mounting groove 401 is greater than the width of the second mounting groove 400 to ensure that the axial width of the magnetic ring 42 is greater than the axial width of the coil 41 to prevent magnetic leakage. This ensures that the magnetic ring 42 fully covers the coil 41, concentrates the magnetic lines of force, and thus increases the driving force of the vibration motor. The bracket 40 has a first clearance groove 406 recessed on the inner wall of one side edge of the upper cover 1 and the lower cover 1'. The bracket 40 has a non-circular limiting protrusion 405 and at least two separate limiting protrusions 404 on the free end face of one side of the upper cover 1 and the lower cover 1'. Two symmetrical first through grooves 402 are provided through the planar mounting groove 403. The height of the limiting protrusions 404 is greater than that of the limiting protrusions 405. The magnetic ring 42 has a second through groove 420 corresponding to the first through groove 402.

[0034] The structure of elastic element 5 is as follows Figure 5 and 6 As shown, it includes an inner ring 51, an outer ring 50, and a spiral elastic arm 52 connecting the inner ring 51 and the outer ring 50; the inner ring 51 is connected to the oscillator assembly 3, and the outer ring 50 is clamped and fixed between the bracket 40 and the upper cover 1 and the lower cover 1' respectively.

[0035] The upper cover 1 and the lower cover 1' are symmetrically arranged towards the inside of the bracket 40. The structure of the upper cover 1 is as follows: Figure 3As shown in the figure, it includes a second relief groove 10 recessed at a position corresponding to the elastic arm 51 in the inner center, a limiting groove 11 adapted to the limiting convex ring 405 at the inner peripheral position, and a second limiting notch 12 adapted to the limiting boss 404, so as to achieve the precise positioning of the bracket 40 with the upper cover 1 and the lower cover 1' respectively. The outer ring 51 is clamped and fixed between the limiting convex ring 405 and the limiting groove 11. The shape of the outer ring 50 is adapted to the limiting convex ring 405. A first limiting notch 53 is provided at the outer edge of the outer ring 50 corresponding to the limiting boss 404. After the upper cover 1 and the lower cover 1' are respectively covered at both ends of the bracket 40, it prevents the elastic member 5 from displacing axially and circumferentially in the vibration motor, and achieves the precise fixation of the bracket 40 and the elastic member 5. The first relief grooves 406 of the bracket 40 and the second relief grooves of the upper cover 1 and the lower cover 1' are used to relieve the deformation of the elastic member 5 in the accommodation space. Preferably, an anti-misalignment groove 13 is provided at the outer surface edge of the other side of the upper cover 1, and the anti-misalignment groove is not provided on the outer surface of the other side of the lower cover 1' to distinguish the up and down directions of the vibration motor axially.

[0036] The axial cross-section of the oscillator assembly 3 is in the shape of a Chinese character 'zhong', and includes a permanent magnet 30, magnetic conductive sheets 31 symmetrically fixed on both sides of the permanent magnet 30, mass blocks 32 symmetrically fixed on both sides of the magnetic conductive sheets 31, and a cylindrical connecting shaft 33 that penetrates and connects to fix the permanent magnet 30, the magnetic conductive sheets 31 and the mass blocks 32; both ends of the connecting shaft 33 are connected and fixed to the inner ring 51. Specifically, the permanent magnet 30, the magnetic conductive sheets 31 and the mass blocks 32 are cylindrical with the same area and are concentrically arranged. Through holes (not marked) of the same size are provided at the center positions of the permanent magnet 30, the magnetic conductive sheets 31 and the mass blocks 32. The connecting shaft 33 passes through the through holes at the same time to connect and fix the oscillator assembly 3 into one body. The lengths of the connecting shaft 33 protruding from both sides of the mass blocks 32 are the same to ensure the balance of the oscillator assembly 3.

[0037] After the vibration motor is assembled, ultrasonic welding is respectively performed at the joints of the upper cover 1 and the bracket 40, the lower cover 1' and the bracket 40, and the upper and lower brackets 40 to complete the finished vibration motor. Two first through grooves 402 form a first through hole 100, and two second through grooves 420 form a second through hole (not marked). The first through hole 100 and the second through hole are radially corresponding and are provided for the external power supply leads (not shown) of the coil 41 to extend out of the vibration motor to be connected and fixed to the circuit board 43 on the outer wall surface of the bracket 40. At this time, the coil 41 and the permanent magnet 30 are arranged at intervals correspondingly. The coil 41 passes through alternating current to generate a periodically changing magnetic field. Through the periodically changing magnetic force between the coil 41 and the permanent magnet 3, the oscillator assembly 3 generates a reciprocating vibration.

[0038] This utility model presents a linear vibration motor with a simple structure, convenient assembly, and good vibration feedback performance. The separate bracket 40, which is combined with the upper cover 1 and the lower cover 1' respectively, facilitates the assembly of the oscillator assembly 3, the stator assembly 4, and the elastic element 5. The arrangement of the double coils 41 corresponding to the permanent magnet 30 helps to generate a stronger magnetic field, thereby achieving high electromagnetic force of the vibration motor. The magnetic ring 40 covering the coils 41 and the magnetic sheets 31 attached to both sides of the permanent magnet 30 both serve to concentrate the magnetic lines of force and prevent magnetic leakage, thereby generating higher driving force and improving vibration feedback performance.

[0039] It should be noted that in the description of this utility model, the terms "upper", "lower", "front", "rear", "left", "horizontal direction", "vertical direction", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A linear vibration motor, comprising an upper cover, a lower cover, an oscillator assembly, a stator assembly, and an elastic element, characterized in that, The stator assembly is integrally cylindrical, including an annular bracket that is divided into upper and lower parts and symmetrically arranged, a magnetic conductive ring and coils respectively fixed on the inner wall surface of the bracket, and a circuit board fixed on the outer wall surface of the bracket. The upper cover and the lower cover are respectively covered on both ends of the bracket to form an accommodating space, and the oscillator assembly is elastically suspended in the accommodating space through the elastic members at both ends thereof; on the inner wall surface of one side of the bracket away from the upper cover and the lower cover, an annular first installation groove and a second installation groove are respectively recessed relatively, and on the outer wall surface, a planar installation groove is respectively recessed relatively; the axial width of the first installation groove is greater than the width of the second installation groove; the first installation groove and the second installation groove are radially connected; the second installation groove is adjacent to the oscillator assembly; the magnetic conductive ring is embedded in the first installation groove, the coil is embedded in the second installation groove, and the circuit board is fixed in the planar installation groove.

2. The linear vibration motor according to claim 1, characterized in that, On the inner wall surface of one side edge of the bracket facing the upper cover and the lower cover, a first relief groove is recessed, and on the free end surface of one side of the bracket facing the upper cover and the lower cover, a non-circular limiting convex ring and at least two separate limiting convex platforms are provided; two symmetric first through grooves are provided through the planar installation groove; the height of the limiting convex platform is less than that of the limiting convex ring.

3. The linear vibration motor according to claim 2, characterized in that, The magnetic conductive ring is provided with a second through groove corresponding to the first through groove.

4. The linear vibration motor according to claim 3, characterized in that, 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 inner ring is connected to the oscillator assembly, and the outer ring is respectively clamped and fixed between the bracket and the upper cover and the lower cover.

5. The linear vibration motor according to claim 4, characterized in that, The shape of the outer ring is adapted to the limiting convex ring, and a first limiting notch is provided on the outer edge of the outer ring corresponding to the limiting convex platform.

6. The linear vibration motor according to claim 5, characterized in that, The inner sides of the upper cover and the lower cover facing the bracket are symmetrically arranged, including a second relief groove recessed at the central position on the inner side corresponding to the elastic arm, a limiting groove adapted to the limiting convex ring at the peripheral position on the inner side, and a second limiting notch adapted to the limiting convex platform.

7. The linear vibration motor according to claim 6, characterized in that, The outer ring is clamped and fixed between the limiting convex ring and the limiting groove.

8. The linear vibration motor according to claim 6, characterized in that, A foolproof groove is provided on the outer surface edge of the other side of the upper cover.

9. The linear vibration motor according to claim 7, characterized in that, The axial cross-section of the oscillator assembly is in the shape of "middle", including a permanent magnet, magnetic conductive sheets symmetrically fixed on both sides of the permanent magnet, mass blocks symmetrically fixed on both sides of the magnetic conductive sheets, and a cylindrical connecting shaft that penetrates and connects and fixes the permanent magnet, the magnetic conductive sheets, and the mass blocks; both ends of the connecting shaft are fixedly connected to the inner ring.

10. The linear vibration motor according to claim 9, characterized in that, The coil and the permanent magnet are arranged at intervals correspondingly.

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