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 with an accommodating space, an elastic piece with a first through hole, a vibrator assembly and a stator assembly, the shell comprises a shell body and a cover plate, the vibrator assembly comprises a mass block and a permanent magnet, and the permanent magnet is arranged in the shell body. The elastic piece is connected to the mass block and suspends the vibrator assembly in the containing space of the shell, a rectangular second through hole is formed in the middle of the mass block, the permanent magnets are embedded in the inner walls of the long edges of the two sides of the second through hole, the stator assembly comprises a flexible circuit board, a coil and a magnetic body embedded in the coil, and the elastic piece is connected to the flexible circuit board. The coil penetrates through the first through hole and is vertically located in the second through hole, the coil and the magnetic body are located between the permanent magnets at intervals, and the linear vibration motor is compact in structure and good in vibration performance and vibration effect.

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 advancement of technology and the continuous improvement of living standards, more and more portable consumer electronics products, such as mobile phones, handheld game consoles, and handheld multimedia devices, have gradually entered people's lives. These portable consumer electronics products often use miniature vibration motors for vibration feedback. For example, linear vibration motors use the principle of generating electromagnetic force to convert electrical energy into mechanical vibration, providing tactile vibration feedback for mobile phone call alerts, alarm reminders, and game console vibration feedback.

[0003] Linear vibration motors typically achieve reciprocating vibrations through an oscillator assembly. Existing linear vibration motors include a mass block, magnets, and coils. The mass block contains paired mounting slots for the magnets, which are glued into these slots. The magnets often have a rectangular structure, with opposite magnetic poles on opposite sides attracting each other. The coils are evenly spaced and stand upright between the magnets. However, with the increasing functionality of electronic devices, the space allocated to vibration motors is becoming increasingly limited. Newer electronic devices often require further reduction in the layout space of vibration motors to ensure certain critical functions. Therefore, how to achieve good vibration performance and effect while making the structure more compact has been a long-standing technical challenge for those skilled in the art. Utility Model Content

[0004] To overcome the technical problems in the prior art, this utility model provides a linear vibration motor with a compact structure and good vibration performance. The specific technical solution is as follows:

[0005] A linear vibration motor includes a housing with a receiving space, an elastic element with a first through hole, an oscillator assembly, and a stator assembly. The housing includes a shell and a cover plate. The oscillator assembly includes a mass block and a permanent magnet. The elastic element is connected to the mass block and suspends the oscillator assembly within the receiving space of the housing. The mass block has a rectangular second through hole in the middle. The permanent magnet is embedded in the inner wall of the long side of the second through hole. The stator assembly includes a flexible circuit board, a coil, and a magnetic body embedded in the coil. The coil passes through the first through hole and is vertically located within the second through hole. The coil and the magnetic body are spaced apart between the permanent magnets.

[0006] Furthermore, the magnetic body is an iron core.

[0007] Furthermore, the magnetic material is a hard magnet.

[0008] Furthermore, the oscillator assembly also includes a magnetic yoke.

[0009] Furthermore, the magnetic yoke is L-shaped, including a horizontal portion and a vertical portion formed by bending vertically from the horizontal portion and located within the first through hole.

[0010] Furthermore, the coil and the magnetic body are spaced apart between the vertical portion.

[0011] The beneficial effects of this utility model are: by embedding an iron core inside the coil to form an electromagnet structure, the electromagnetic force between the permanent magnet and the coil can be enhanced, thereby improving the driving force of the linear vibration motor and achieving good vibration performance and vibration effect; and by embedding a hard magnet inside the coil to form a magnetic spring structure, the required K value of the elastic element can be reduced through the hard magnet, reducing the risk of elastic element breakage, improving motor life, and ensuring good vibration performance and vibration effect. Attached Figure Description

[0012] Figure 1 This is an exploded view of the structure of the linear vibration motor of this utility model.

[0013] Figure 2 This is a perspective view of the linear vibration motor of this utility model.

[0014] Figure 3 yes Figure 2 A sectional view along AA.

[0015] in:

[0016] 1-Shell;

[0017] 2-Lid

[0018] 3-Stator assembly; 30-Flexible circuit board; 31-Coil; 32-Magnetic body;

[0019] 4-Oscillator assembly; 40-Mass block; 400-Second through hole; 41-Permanent magnet; 42-Magnetic yoke;

[0020] 5-Elastic element; 50-First through hole. Detailed Implementation

[0021] 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.

[0022] The linear vibration motor structure of the first embodiment of this utility model is as follows: Figures 1 to 3As shown, the device includes a housing (not shown) with a receiving space, an elastic element 5 with a first through hole 50, an oscillator assembly 4, and a stator assembly 3. The housing includes a shell 1 and a cover plate 2. The stator assembly 3 is fixed to the cover plate 2 and includes a flexible circuit board 30, a coil 31, and a magnetic body 32 embedded in the coil 31. The coil 31 is disposed on the flexible circuit board 30 and electrically connected to the flexible circuit board 30. The oscillator assembly 4 includes a mass block 40, a permanent magnet 41, and a yoke 42. The elastic element 5 is connected to the mass block 40. The oscillator assembly 4 is elastically suspended within the housing space of the outer casing. A rectangular second through-hole 400 is provided in the center of the mass block 40. Permanent magnets 41 are embedded in the inner walls of the long sides of the second through-hole 400. The coil 31 passes through the first through-hole 50 and is vertically positioned within the second through-hole 400. The first and second through-holes 50 and 400 accommodate the coil 31 and the magnetic body 32. The coil 31 and the magnetic body 32 are spaced apart between the permanent magnets 41. Preferably, the magnetic body 32 is configured as an iron core, forming an electromagnet structure, which enhances the permanent magnet 31. The electromagnetic force between the yoke and the coil 31 enhances the driving force of the linear vibration motor, achieving good vibration performance and effect. Preferably, the yoke is L-shaped, including a horizontal part (not shown) covering the mass block 40 and the permanent magnet 41 vertically, and a vertical part (not shown) bent vertically from the horizontal part and located in the first through hole 400. At this time, the coil 31 and the magnetic body 32 are evenly spaced between the vertical part. The horizontal part limits the upper and lower positions of the mass block 40 and the permanent magnet 41 in the vertical direction, and the vertical part limits the left and right positions of the permanent magnet 41 in the horizontal direction. Thus, the magnetic yoke makes the adhesion between the mass block 40 and the permanent magnet 41 stronger, increases the bonding force of the permanent magnet 41, and prevents the permanent magnet 41 from falling off during long-term use of the vibration motor or during impact reliability tests. At the same time, it can prevent the leakage of magnetic flux from the permanent magnet 41 to improve magnetic efficiency, thereby increasing the vibration force or ensuring vibration at low voltage. The linear vibration motor has high reliability, thus achieving good vibration performance and effect.

[0023] The structure of the linear vibration motor in the second embodiment of this utility model is as follows: Figures 1 to 3 As shown, as an alternative to the first embodiment, the magnetic body 32 is set as a hard magnet to form a magnetic spring structure. The hard magnet can reduce the required K value of the elastic element, reduce the risk of elastic element breakage, improve motor life, and ensure good vibration performance and vibration effect.

[0024] 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.

[0025] 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 having a receiving space, an elastic element having a first through hole, an oscillator assembly, and a stator assembly, characterized in that, The outer casing includes a housing and a cover plate. The oscillator assembly includes a mass block and a permanent magnet. The elastic element is connected to the mass block and suspends the oscillator assembly within the receiving space of the outer casing. The mass block has a rectangular second through hole in the middle. The permanent magnet is embedded in the inner wall of the long side of the second through hole. The stator assembly includes a flexible circuit board, a coil, and a magnetic body embedded in the coil. The coil passes through the first through hole and is vertically located in the second through hole. The coil and the magnetic body are spaced apart between the permanent magnets.

2. The linear vibration motor according to claim 1, characterized in that, The magnetic material is an iron core.

3. The linear vibration motor according to claim 1, characterized in that, The magnetic material is a hard magnet.

4. The linear vibration motor according to claim 1, characterized in that, The oscillator assembly also includes a magnetic yoke.

5. The linear vibration motor according to claim 4, characterized in that, The magnetic yoke is L-shaped, including a horizontal portion and a vertical portion formed by bending vertically from the horizontal portion and located within the first through hole.

6. The linear vibration motor according to claim 5, characterized in that, The coil and the magnet are spaced apart between the vertical portions.

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