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 and a cover body, the shell and the cover body are buckled to form an accommodating space, the shell and the cover body are cylinders with openings at one ends, and the shell comprises a circular first bottom, a first side wall and a first notch arranged at the free end of the first side wall; the cover body comprises a second circular bottom, a second side wall which is formed by bending and extending from the periphery of the second bottom, a supporting part which extends from the second bottom in parallel and extends out of the accommodating space, and an arc-shaped bending part between the second bottom and the second side wall, and the second side wall is provided with a second notch corresponding to the first notch; the outer wall face of the second side wall and the inner wall face of the first side wall are arranged in a close fit mode, the second side wall is located in the containing space, and a gap between the first side wall and the bent part is coated with a first sealant part. The linear vibration motor is high in structural stability, good in sealing performance and good in vibration performance.

Description

Technical Field

[0001] This utility model relates to the field of linear 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. For example, silent call alerts or haptic feedback from mobile phones, handheld game consoles, and multimedia entertainment devices require vibration of the device to remind users. The component that generates the vibration is a built-in miniature linear vibration motor. To meet such a wide range of applications, the requirements for miniaturization and vibration performance of the linear vibration motor are becoming increasingly stringent.

[0003] Existing linear vibration motors experience a drastic reduction in lifespan under high temperature and humidity conditions, with vibration performance declining even at rated voltage and resonant frequency sinusoidal signals. Tests have confirmed that the lifespan of the vibration motor is unaffected in a purely high-temperature environment (results are essentially the same as those under normal temperature and humidity conditions). This confirms that the internal spring components corrode under high humidity, drastically shortening their lifespan and consequently reducing the overall lifespan of the vibration motor.

[0004] Therefore, there is an urgent need for a linear vibration motor with good sealing performance and high vibration performance to solve the technical problems of existing linear vibration motors. Summary of the Invention

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

[0006] A linear vibration motor includes a housing and a cover, which are fastened together to form an accommodating space. The housing and cover are cylinders with one open end. The housing includes a circular first bottom, a first sidewall, and a first notch at the free end of the first sidewall. The cover includes a circular second bottom, a second sidewall that bends and extends from the periphery of the second bottom, and a support portion that extends parallel to the second bottom and extends out of the accommodating space. There is an arc-shaped bend between the second bottom and the second sidewall. The second sidewall has a second notch corresponding to the first notch. The outer wall surface of the second sidewall is tightly fitted with the inner wall surface of the first sidewall. The second sidewall is located within the accommodating space. A first sealant portion is applied to the gap between the first sidewall and the bend portion.

[0007] Preferably, the first sidewall is perpendicular to the first bottom, and the second sidewall is perpendicular to the second bottom; the free end face of the first sidewall is flush with the outer surface of the second bottom.

[0008] Preferably, it also includes a stator assembly, which includes a flexible circuit board and a coil, the flexible circuit board including an internal power terminal and an external power terminal.

[0009] Preferably, the sum of the heights of the first notch and the second notch is equal to the thickness of the flexible circuit board.

[0010] Preferably, the internal power terminal is fixed on the inner surface of the second bottom, and the external power terminal extends from the first and second notches and is fixed on the support.

[0011] Preferably, the area of ​​the support portion is larger than the area of ​​the external power terminal.

[0012] Preferably, the positions of the first notch, the second notch, the external power terminal, and the support portion fully cover the second sealant portion.

[0013] Compared with the prior art, this utility model provides a linear vibration motor with a simple structure. The first side wall of the housing of this linear vibration motor coincides with the second side wall of the cover, which ensures the welding stability of the housing and the cover. The first sealant part is applied between the first side wall and the second bottom periphery, which not only increases the amount of sealant, but also prevents the sealant from overflowing, thereby improving the vibration performance of the linear vibration motor. Attached Figure Description

[0014] Figure 1 This is an exploded structural diagram of the shell, cover, flexible circuit board, and sealant of this utility model.

[0015] Figure 2 This is a cross-sectional view of the linear vibration motor of this utility model.

[0016] Wherein: 1-shell; 10-first bottom; 11-first sidewall; 12-first notch; 2-cover; 20-second bottom; 21-second sidewall; 22-second notch; 23-support part; 24-bending part; 30-flexible circuit board; 31-coil; 40-mass block; 41-pole sheet; 42-magnet; 43-damping element; 5-elastic element; 6-first sealant part; 6'-second sealant part. Detailed Implementation

[0017] 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.

[0018] The structure of a linear vibration motor according to the first embodiment of this utility model is as follows: Figure 1 and Figure 2 As shown, the device includes a housing 1, a cover 2, a stator assembly 3, an oscillator assembly 4, and an elastic element 5. The housing 1 and the cover 2 are made of metal and are cylinders with one open end. The housing 1 and the cover 2 are fastened together to form an accommodating space. The stator assembly (not shown) is fixed to the inner surface of the cover. The oscillator assembly 4 is connected to the inner wall of the housing through the elastic element 5 and is elastically suspended in the accommodating space. The oscillator assembly 4 and the stator assembly 3 are arranged vertically at intervals. The elastic element 5 has a cone-shaped structure and includes at least three spiral elastic arms (not shown) to better realize the rebound and reset function of the elastic element 5 on the oscillator assembly 4.

[0019] The housing 1 includes a circular first bottom 10, a first sidewall 11, and a first notch 12 at the free end of the first sidewall 11; the cover 2 includes a circular second bottom 20, a second sidewall 21 extending perpendicularly from the second bottom 20, and a support portion 23 extending parallel to the second bottom 20 and extending out to provide an accommodating space; a bend 24 between the second bottom 20 and the second sidewall 21; a second notch 22 corresponding to the first notch 12 on the second sidewall 21; the outer wall surface of the second sidewall 21 is tightly fitted with the inner wall surface of the first sidewall 11; the second sidewall 21 is located within the accommodating space; a first sealant portion 6 is applied to the gap between the first sidewall 11 and the bend 24; the free end face of the first sidewall 11 is flush with the outer surface of the second bottom 20.

[0020] The stator assembly (not shown) includes a flexible circuit board 30 and a ring-shaped coil 31. The flexible circuit board 30 is attached to the inner surface of the cover 2. The flexible circuit board 30 includes an internal power terminal (not shown) and an external power terminal (not shown). The internal power terminal (not shown) is fixed to the inner surface of the second bottom 20. The sum of the heights of the first notch 12 and the second notch 22 is equal to the thickness of the flexible circuit board. The external power terminal extends from the first notch 12 and the second notch 22 and is fixed to the support portion 23. The positions of the first notch 12, the second notch 22, the external power terminal, and the support portion 21 completely cover the second sealant portion 6' to prevent impurities, water, or water vapor from entering the accommodating space of the linear vibration motor from the joint between the housing 1 and the cover 2. The area of ​​the support portion 23 is larger than the area of ​​the external power terminal to ensure that the second sealant portion 6' can fully cover the external power terminal.

[0021] The oscillator assembly 4 includes an annular mass block 40 with a circular perforation (not shown) in the middle, an electrode plate 41 covering and fixed on the perforation, a magnet 42 fixed at the center of the lower surface of the electrode plate 41, and a damping member 43 fixed at the center of the upper surface of the electrode plate 41. The magnet 42 is cylindrical and is evenly spaced in the perforation. The coil 31 is located in the gap (not shown) between the magnet 42 and the inner wall of the perforation. The thickness of the coil 31 is less than the width of the gap, so that during the reciprocating motion of the oscillator assembly 4, the magnet 42 moves up and down in the inner ring of the coil 31, and the gap serves to allow the coil 31 to move. One end of the elastic member 5 is connected and fixed to the bottom surface of the inner wall of the housing 1, and the other end is connected and fixed to the electrode plate 41, thereby suspending the oscillator assembly 4 in the accommodating space.

[0022] The sealant in this invention can be a thermosetting adhesive or a UV adhesive, etc. Preferably, the first sealant part 6 and the second sealant part 6' are integrally coated to save on the coating process of the linear vibration motor and reduce costs. Furthermore, depending on the needs of the end customer, when the housing 1 and cover 2 of the linear vibration motor are made of plastic, they are fixed by ultrasonic welding; when they are made of metal, they are fixed by laser welding. If the end customer does not require high stability for the linear vibration motor in its final application, the housing 1 and cover 2 can be directly connected and fixed with sealant to save on the assembly process of the linear vibration motor and reduce costs.

[0023] 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.

[0024] 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 a housing and a cover, wherein the housing and the cover are fastened together to form an accommodating space, characterized in that, The shell and cover are cylinders with one open end. The shell includes a circular first bottom, a first sidewall, and a first notch at the free end of the first sidewall. The cover includes a circular second bottom, a second sidewall that bends and extends from the periphery of the second bottom, and a support portion that extends parallel to the second bottom and extends out of the accommodating space. There is an arc-shaped bend between the second bottom and the second sidewall. The second sidewall has a second notch corresponding to the first notch. The outer wall surface of the second sidewall is tightly fitted with the inner wall surface of the first sidewall. The second sidewall is located within the accommodating space. A first sealant portion is applied to the gap between the first sidewall and the bend portion.

2. The linear vibration motor according to claim 1, characterized in that, The first sidewall is perpendicular to the first bottom, and the second sidewall is perpendicular to the second bottom; the free end face of the first sidewall is flush with the outer surface of the second bottom.

3. The linear vibration motor according to claim 1, characterized in that, It also includes a stator assembly, which includes a flexible circuit board and coils, the flexible circuit board including internal power terminals and external power terminals.

4. The linear vibration motor according to claim 3, characterized in that, The sum of the heights of the first and second notches is equal to the thickness of the flexible circuit board.

5. The linear vibration motor according to claim 4, characterized in that, The internal power terminal is fixed on the inner surface of the second bottom, and the external power terminal extends from the first and second notches and is fixed on the support.

6. The linear vibration motor according to claim 5, characterized in that, The area of ​​the support portion is larger than the area of ​​the external power terminal.

7. The vibration motor according to claim 6, characterized in that, The first notch, the second notch, the external power terminal, and the support portion all cover the second sealant portion.

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