Vibration motor

Abstract

The utility model relates to the technical field of vibration motors, in particular to a vibration motor, which comprises a cuboid shell with an accommodating space, a stator assembly, a vibrator assembly, an elastic piece and a cover plate, the vibrator assembly comprises a mass block and a magnet, the vibrator assembly is suspended in the accommodating space of the shell through the elastic piece, the stator assembly comprises an annular coil and a flexible circuit board, the stator assembly is fixed on the cover plate, the shell is matched and buckled with the cover plate, the elastic piece is formed by integrally punching a metal sheet and comprises a vibrator fixing part, a shell fixing part and an elastic arm connected between the vibrator fixing part and the shell fixing part, and the shell is provided with a through hole matched with the shell fixing part. The shell fixing part of the vibration motor passes through the through hole and is bent and attached to the outer wall surface of the shell, and the shell fixing part and the outer wall surface of the shell are welded and fixed, so that the processing is simple, the combination of the elastic piece and the shell is more stable, the vibrator assembly can be supported to swing greatly, and the strong vibration sense requirement of a consumer is met.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration motors and discloses a vibration motor. Background Art

[0002] Micro vibration motors are commonly found in smart electronic devices such as mobile phones, tablet computers, and game controllers, and are used to provide vibration feedback to consumers to alert them, such as incoming phone calls, game vibration alerts, etc. The horizontal linear vibration motors currently on the market are powered by the stator assembly, and the coils in the stator assembly form a magnetic field, which drives the vibrator assembly with permanent magnet steel to perform reciprocating cyclic motion. However, as electronic devices are becoming increasingly miniaturized and thin, there is an urgent need for a vibration motor with a simple structure and strong vibration sensation in the limited vibration motor accommodation space that these electronic devices can provide to meet the needs of the market and consumers. Utility Model Content

[0003] The purpose of the utility model is to provide a vibration motor, aiming to solve the problem of weak vibration sense of existing vibration motors, and its specific technical solution is as follows:

[0004] A vibration motor comprises a rectangular shell with an accommodating space, a stator assembly, a vibrator assembly, an elastic member and a cover plate, wherein the vibrator assembly comprises a mass block and a magnet, the vibrator assembly is suspended in the accommodating space of the shell through the elastic member, the stator assembly comprises a ring coil and a flexible circuit board, the stator assembly is fixed on the cover plate, the shell and the cover plate are fitted and snapped together, the flexible circuit board extends out of the shell to connect an external power supply, the elastic member is integrally punched from a metal sheet, comprises a vibrator fixing portion, a shell fixing portion and an elastic arm connected between the vibrator fixing portion and the shell fixing portion, the shell is provided with a through hole adapted to the shell fixing portion, the shell fixing portion passes through the through hole and is bent and fitted to the outer wall surface of the shell.

[0005] Preferably, the vibrator fixing portion is fixed to the upper surface of the vibrator assembly, the vibrator fixing portion is welded and fixed to the mass block and the magnet at the same time, and the shell fixing portion is welded and fixed to the outer wall surface of the shell.

[0006] Preferably, the housing comprises a bottom wall and side walls, the side walls comprise opposite short side walls, and free ends of the short side walls are provided with notches corresponding to the extended flexible circuit board.

[0007] Preferably, the elastic arm is located between the mass block and one short side of the side wall.

[0008] Preferably, the distance from the short side wall on one side of the elastic arm to the outer wall of the mass block is greater than the distance from the short side wall on the other side to the outer wall of the mass block, and the weight of the mass block on one side of the elastic arm is lighter than that of the mass block on the other side.

[0009] Preferably, the bottom wall, the short side wall and the inner surface of the cover plate are respectively provided with a first damping plate, a second damping plate and a limiting plate corresponding to the upper surface, the side wall surface and the lower surface of the mass block on the closer side.

[0010] Preferably, the first damping plate, the second damping plate and the limiting plate are made of rubber or foam.

[0011] Preferably, the through hole and the notch are located on the same side of the housing.

[0012] Preferably, the through hole passes through the bottom wall on one side of the elastic arm.

[0013] Preferably, the through hole passes through the short side wall on one side of the elastic arm.

[0014] Compared with the prior art, the casing fixing part of the vibration motor of the utility model passes through the through hole and is bent to fit the outer wall surface of the casing, and the casing fixing part is welded and fixed to the outer wall surface of the casing. The processing is simple, and the combination of the elastic part and the casing is more stable, which can support the large swing of the vibrator assembly and meet the consumers' demand for strong vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a perspective view of the outer shell of the first embodiment.

[0016] Figure 2 It is a cross-sectional view of the vibration motor according to the first embodiment.

[0017] Figure 3 It is a perspective view of the outer shell of the second embodiment.

[0018] Figure 4 It is a cross-sectional view of a vibration motor according to a second embodiment.

[0019] in:

[0020] 1-housing; 10-bottom wall; 11-side wall; 100-through hole; 110-notch;

[0021] 2-cover plate;

[0022] 3-stator assembly; 30-coil; 31-flexible circuit board;

[0023] 4-vibrator assembly; 40-mass block; 41-magnetic steel;

[0024] 5-elastic member; 50-vibrator fixing portion; 52-elastic arm; 53-housing fixing portion;

[0025] 6-first damping plate; 7-second damping plate; 8-limiting plate. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] A vibration motor according to the first embodiment of the utility model is as follows Figure 1 and Figure 2 As shown, it includes a rectangular housing 1 with an accommodating space, a stator assembly 3, a vibrator assembly 4, an elastic member 5 and a cover plate 2, the vibrator assembly 4 includes a mass block 40 and a magnet 41, the vibrator assembly 3 is suspended in the accommodating space of the housing 1 through the elastic member, the stator assembly 3 includes a ring coil 30 and a flexible circuit board 31, the stator assembly 3 is fixed on the cover plate 2, the housing 1 and the cover plate 2 are adapted to form a vibration motor, the flexible circuit board 31 is connected to the housing 1 through an external power supply (not shown), the utility model generates a magnetic field by energizing the coil 30 through the flexible circuit board 31 to drive the magnet 41 to reciprocate up and down, and the elastic member 5 uses a cantilever spring sheet to achieve a large swing on the left side of the vibrator assembly 3, thereby generating a greater driving force and achieving a stronger vibration sense. The lower surface of the magnet 41 protrudes from the lower surface of the mass block 40, the magnet 41 is spaced and adapted with the coil 30, and the inner ring area of ​​the coil 30 is larger than the flat area of ​​the magnet 41, so that the magnet 41 will not collide with the coil 30 during the reciprocating swing of the vibrator assembly 3.

[0028] The elastic member 5 is integrally punched from a metal sheet, and includes a vibrator fixing portion 50, a shell fixing portion 52, and an elastic arm 51 connected between the vibrator fixing portion 50 and the shell fixing portion 52; the vibrator fixing portion 50 is fixed to the upper surface of the vibrator assembly 3, and the vibrator fixing portion 50 is welded and fixed to the upper surfaces of the mass block 40 and the magnet 41 at the same time, and the shell fixing portion 52 is welded and fixed to the outer wall surface of the shell 1; the weight of the mass block 40 on one side of the elastic arm 51 is lighter than the weight of the mass block 40 on the other side, so that the vibrator assembly 4 generates a greater driving force; the elastic arm 51 is located between the mass block 40 and one short side of the side wall 11, the distance from the short side side wall 11 on one side of the elastic arm 51 to the outer wall surface of the mass block 40 is greater than the distance from the short side side wall on the other side to the outer wall surface of the mass block, and the height of the shell fixing portion 52 in the vertical direction of the vibration motor is higher than the height of the vibrator fixing portion 50, and the height of the vibrator fixing portion 50 is higher than the vibrator fixing portion 50, so that space for the elastic arm 51 to generate deformation and rebound force is provided.

[0029] The shell 1 includes a bottom wall 10 and a side wall 11, and the side wall 11 includes opposite short side walls. The free end of the short side wall 11 is provided with a notch 110 corresponding to the extended flexible circuit board 31; the shell 1 is provided with a through hole 100 adapted to the shell fixing part 52, and the through hole 100 and the notch 110 are located on the same side of the shell 1. The through hole 100 passes through the bottom wall 10 on one side of the elastic arm 51. After the shell fixing part 52 passes through the through hole 100, it is bent vertically again to fit the outer wall surface of the shell 1, and finally the shell fixing part 52 is welded and fixed to the outer surface of the bottom wall 10 of the shell 1. The assembly and processing of the vibration motor is simple, and the combination of the elastic member 5 and the shell 1 is more stable, so as to support the large swing of the vibrator assembly 4 and meet the strong vibration demand of consumers. In addition, the bottom wall 10, the short side wall 11 and the inner surface of the cover plate 2 respectively correspond to the upper surface, side wall surface and lower surface of the mass block 40 on the closer side, and are provided with a first damping plate 6, a second damping plate 7 and a limiting plate 8 made of buffering materials such as rubber or foam, so as to avoid the mass block 40 of the vibrator assembly 4 swinging up and down by the elastic member 5 directly hitting the bottom wall 10, the short side wall 11 and the inner surface of the cover plate 211 to generate noise. At the same time, the limiting plate 8 can limit the swinging stroke of the mass block 40 of the vibrator assembly 4, thereby improving the vibration performance of the vibration motor.

[0030] A vibration motor according to the second embodiment of the utility model is as follows Figure 3 and Figure 4As shown, the through hole 100 passes through the short side wall 11 on one side of the elastic arm 51, and the shell fixing portion 52 of the elastic member 5 extends horizontally from the elastic arm 51. After passing through the through hole 100, the shell fixing portion 52 is vertically bent and fits the outer wall surface of the short side wall 11. Finally, the shell fixing portion 52 is fit to the outer surface of the short side wall 11 and welded to fix. The assembly and processing of the vibration motor is simple, and the combination of the elastic member 5 and the shell 1 is more stable, so as to support the large swing of the vibrator assembly 4 and meet the strong vibration demand of consumers.

[0031] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "horizontal direction", "vertical direction" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vibration motor, comprising a rectangular parallelepiped housing with an accommodating space, a stator assembly, a vibrator assembly, an elastic member and a cover plate, wherein the vibrator assembly comprises a mass block and a magnet, the vibrator assembly is suspended in the accommodating space of the housing through the elastic member, the stator assembly comprises a ring coil and a flexible circuit board, the stator assembly is fixed on the cover plate, the housing is fitted with the cover plate, the flexible circuit board extends out of the housing and is connected to an external power source, characterized in that: The elastic part is punched out of a metal sheet in one piece, and includes a vibrator fixing part, a shell fixing part, and an elastic arm connected between the vibrator fixing part and the shell fixing part. The shell is provided with a through hole adapted to the shell fixing part, and the shell fixing part passes through the through hole and is bent to fit the outer wall surface of the shell.

2. A vibration motor according to claim 1, characterized in that: The vibrator fixing part is fixed on the upper surface of the vibrator assembly, the vibrator fixing part is welded and fixed to the mass block and the magnet at the same time, and the shell fixing part is welded and fixed to the outer wall surface of the shell.

3. A vibration motor according to claim 2, characterized in that: The housing comprises a bottom wall and side walls, wherein the side walls comprise opposite short-side side walls, and a notch is arranged at a free end of the short-side side wall corresponding to the extended flexible circuit board.

4. A vibration motor according to claim 3, characterized in that: The elastic arm is located between the mass block and one short side of the side wall.

5. A vibration motor according to claim 4, characterized in that: The distance from the short side wall on one side of the elastic arm to the outer wall of the mass block is greater than the distance from the short side wall on the other side to the outer wall of the mass block, and the weight of the mass block on one side of the elastic arm is lighter than the weight of the mass block on the other side.

6. A vibration motor according to claim 5, characterized in that: The bottom wall, the short side wall and the inner surface of the cover plate are respectively provided with a first damping plate, a second damping plate and a limiting plate corresponding to the upper surface, the side wall surface and the lower surface of the mass block on the closer side.

7. A vibration motor according to claim 6, characterized in that: The first damping plate, the second damping plate and the limiting plate are made of rubber or foam.

8. A vibration motor according to claim 7, characterized in that: The through hole and the notch are located on the same side of the housing.

9. A vibration motor according to claim 8, characterized in that: The through hole passes through the bottom wall on one side of the elastic arm.

10. A vibration motor according to claim 8, characterized in that: The through hole passes through the short side wall at one side of the elastic arm.

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