Linear vibration motor

Abstract

This application provides a linear vibration motor. 【Solution means】The linear vibration motor includes a housing having an accommodation space, a vibration assembly and a stator assembly accommodated in the accommodation space, and an elastic member that supports the vibration assembly in the accommodation space. The vibration assembly includes a mass block suspended in the accommodation space, and the mass block is provided with an accommodation hole penetrating therethrough. The vibration assembly further includes an iron core fixed to the mass block and accommodated in the accommodation hole, and a coil wound around the iron core. The stator assembly includes a magnetic steel fixed to the housing, and the magnetic steel extends into the accommodation hole and is disposed opposite to the coil and the mass block with a gap therebetween. The linear vibration motor according to this application has a high driving force and good vibration performance.

Description

Technical Field

[0001] This application relates to the technical field of motors, and particularly to a linear vibration motor for portable mobile terminals.

Background Art

[0002] With the development of electronic technology, portable electronic products such as mobile phones and portable game consoles are increasingly popular among people. These electronic products generally use linear vibration motors to provide vibration feedback.

[0003] A related linear vibration motor includes a housing having an accommodation space, a vibration assembly located in the accommodation space, a stator assembly fixed to the housing, and an elastic member supporting the vibration assembly. The stator assembly generally includes a solenoid composed of a coil and an iron core. The vibration assembly includes a mass block and a magnetic steel fixed to the mass block. The solenoid and the magnetic steel interact to generate a driving force to drive the vibration assembly to reciprocate, thereby providing a vibration feeling. However, in the related art, the driving force of the solenoid and the magnetic steel of the linear vibration motor is not fully exerted, and the vibration feedback of the linear vibration motor cannot be optimally achieved.

[0004] Therefore, in order to solve the above technical problems, it is necessary to provide a new linear vibration motor.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The object of this application is to provide a linear vibration motor with high driving force and excellent vibration performance.

Means for Solving the Problems

[0006] To achieve the above object, the present application provides a linear vibration motor, which includes a housing having an accommodation space, a vibration assembly and a stator assembly accommodated in the accommodation space, and an elastic member for supporting the vibration assembly in the accommodation space. The vibration assembly includes a mass block suspended in the accommodation space, and the mass block is provided with an accommodation hole penetrating therethrough. The vibration assembly further includes an iron core fixed to the mass block and accommodated in the accommodation hole, and a coil wound around the iron core. The stator assembly includes a magnetic steel fixed to the housing, and the magnetic steel extends into the accommodation hole and is disposed opposite to the coil and the mass block with a gap therebetween.

[0007] Preferably, the mass block includes a side wall formed to surround the accommodation hole, and an end portion of the iron core is fixed to the side wall.

[0008] Preferably, the mass block is rectangular, and the side wall includes a first side wall extending along the longitudinal direction and provided opposite to each other, and a second side wall extending along the short side direction and provided opposite to each other.

[0009] Preferably, the magnetic steel includes a first magnetic steel provided on both sides of the coil along a first direction, and a second magnetic steel provided on both sides of the coil along a second direction. The first magnetic steel and the second magnetic steel are provided to surround the coil with a gap therebetween on the circumferential side, and two of the first direction, the second direction, and the vibration direction of the vibration assembly are perpendicular to each other.

[0010] Preferably, the first magnetic steel is magnetized along the first direction, and the two first magnetic steels are disposed opposite to each other with the same poles along the first direction. The second magnetic steel is magnetized along the second direction, and the two second magnetic steels are disposed opposite to each other with the same poles along the second direction.

[0011] Preferably, both the first magnetic steel and the second magnetic steel have a three-stage magnetization structure.

[0012] Preferably, on one side of the coil along the first direction, three of the first magnetic steels arranged in order along the vibration direction are provided, and the magnetization direction of the first magnetic steel located at the middle position is opposite to the magnetization directions of the first magnetic steels located at both ends. On one side of the coil along the second direction, three of the second magnetic steels arranged in order along the vibration direction are provided, and the magnetization direction of the second magnetic steel located at the middle position is opposite to the magnetization directions of the second magnetic steels located at both ends.

[0013] Preferably, the mass block further includes a fixing boss formed to protrude from the second side wall, and an end of the iron core is fixed to the fixing boss.

[0014] Preferably, the iron core includes an end face fixed to the fixing boss, and an adhesive accommodation groove is provided in the iron core and recessed in a direction away from the fixing boss from the end face.

[0015] Preferably, the housing includes an upper cover and a lower cover installed opposite to each other with a space therebetween, and a side wall connecting the upper cover and the lower cover. The upper cover, the lower cover, and the side wall together surround to form the accommodation space. One end of the elastic member is fixed to the side wall, and the other end is fixed to the mass block. The two second magnetic steels are respectively fixed to the upper cover and the lower cover.

Advantages of the Invention

[0016] Compared with the related art, the linear vibration motor according to the present application fixes the iron core and the coil to the mass block to form a vibration assembly, and fixes the magnetic steel to the housing to form a stator assembly, thereby greatly improving the electromagnetic field utilization rate of the iron core and the coil, improving the magnetic field strength of the magnetic steel, significantly enhancing the driving force of the linear vibration motor, and improving the vibration performance of the linear vibration motor.

[0017] To more clearly explain the technical solution of the embodiments of the present application, the drawings required for the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative effort.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0019] Hereinafter, with reference to the drawings in the embodiments of the present application, the technical solution in the embodiments of the present application will be clearly and completely described.

[0020] As shown in FIGS. 1 to 5, Embodiment 1 of the present application provides a linear vibration motor 100, and the linear vibration motor 100 includes a housing 10 having an accommodation space 11, a vibration assembly 20 and a stator assembly 30 accommodated in the accommodation space 11, and an elastic member 40 that supports the vibration assembly 20 in the accommodation space 11. The elastic member 40 supports the vibration unit 20 to reciprocate along the vibration direction to provide a vibration feeling.

[0021] The housing 10 includes an upper cover 12 and a lower cover 13 that are oppositely installed with a space therebetween, and a side wall 14 that connects the upper cover 12 and the lower cover 13. The upper cover 12, the lower cover 13, and the side wall 14 together surround to form the accommodation space 11.

[0022] The vibration assembly 20 includes a mass block 21 suspended in the accommodation space 11, an iron core 22 fixed to the mass block 21, and a coil 23 wound around the iron core 22. Specifically, the mass block 21 is provided with an accommodation hole 211 penetrating therethrough, and the iron core 22 and the coil 23 are accommodated in the accommodation hole 211. One end of the elastic member 40 is fixed to the side wall 14, and the other end is fixed to the mass block 21.

[0023] As shown in FIGS. 2 to 5, the stator assembly 30 includes a magnetic steel 31 fixed to the housing 10. The magnetic steel 31 extends into the accommodation hole 211 and is installed opposite to the coil 23 and the mass block 21 with a space therebetween.

[0024] The mass block 21 includes a side wall 212 formed to surround the accommodation hole 211, and an end of the iron core 22 is fixed to the side wall 212. As shown in FIG. 2, since the mass block 21 is rectangular, the side wall 212 includes a first side wall 2121 extending along the longitudinal direction and provided oppositely, and a second side wall 2122 extending along the short side direction and provided oppositely. Further, the magnetic steel 31 includes a first magnetic steel 311 provided on both sides of the coil 23 along a first direction, and a second magnetic steel 312 provided on both sides of the coil 23 along a second direction. The first direction, the second direction, and the vibration direction are perpendicular to each other in pairs. The accommodation hole 211 penetrates the mass block 21 along the second direction. The first magnetic steel 311 is installed with a space from the first side wall 2121.

[0025] As can be understood, when one of the first magnetic steels 311 is provided on each of both sides of the coil 23 along the first direction, and one of the second magnetic steels 312 is provided on each of both sides of the coil 23 along the second direction, the first magnetic steel 311 and the second magnetic steel 312 are provided to surround the coil 23 with a space therebetween on the circumferential side. In the present application, the first magnetic steel 311 is magnetized along the first direction, and the two first magnetic steels 311 are installed with the same poles facing each other along the first direction. The second magnetic steel 312 is magnetized along the second direction, and the two second magnetic steels 312 are installed with the same poles facing each other along the second direction. As shown in FIG. 5, the two second magnetic steels 312 are respectively fixed to the upper cover 12 and the lower cover 13. Further, in the present embodiment, one end of the first magnetic steel 311 along the second direction is fixed to the lower cover 13, and the other end is installed at a distance from the upper cover 12. In another embodiment, one end of the first magnetic steel 311 may be fixed to the upper cover 12, and the other end may be installed at a distance from the lower cover 13, and it can be selected according to actual design needs.

[0026] In the present application, on one side of the coil 23 along the first direction, three of the first magnetic steels 311 arranged in sequence along the vibration direction are provided, and the magnetization direction of the first magnetic steel 311 located at the intermediate position is opposite to the magnetization directions of the first magnetic steels 311 located at both ends. On one side of the coil 23 along the second direction, three of the second magnetic steels 312 arranged in sequence along the vibration direction are provided, and the magnetization direction of the second magnetic steel 312 located at the intermediate position is opposite to the magnetization directions of the second magnetic steels 312 located at both ends.

[0027] As shown in FIG. 6, in the linear vibration motor according to Embodiment 2 of the present application, the difference from the linear vibration motor in Embodiment 1 is that both the first magnetic steel 311 and the second magnetic steel 312 are integral magnetic steels and only have a three-stage magnetization structure. As can be understood, the first magnetic steel 311 includes three magnetization regions (not shown) arranged in sequence along the vibration direction, and the magnetization region located at the middle position is opposite to the magnetization directions of the magnetization regions at both ends. Similarly, the second magnetic steel 312 includes three magnetization regions (not shown) arranged in sequence along the vibration direction, and the magnetization region located at the middle position is opposite to the magnetization directions of the magnetization regions at both ends.

[0028] To enhance the magnetic field performance of the magnetic steel 31, the stator assembly 30 further includes a first magnetic yoke 32 fixed to the side facing the first side wall 2121 of the first magnetic steel 311, and the first magnetic yoke 32 is installed at a distance from the first side wall 2121.

[0029] The mass block 21 further includes a fixed boss 213 formed by protruding from the second side wall 2122, and the end of the iron core 22 is fixed to the fixed boss 213. Further, the iron core 22 includes an end face 221 fixed to the fixed boss 213, and an adhesive accommodating groove 222 is provided in the iron core 22 and recessed in a direction away from the fixed boss 213 from the end face 221. When the end face 221 of the iron core 22 is fixed to the fixed boss 213 by adhesion, the adhesive accommodating groove 222 can accommodate a part of the adhesive to prevent adhesive leakage, improve the fixing strength between the iron core 22 and the mass block 21, and improve the vibration reliability of the linear vibration motor 100.

[0030] Compared with the related art, the linear vibration motor according to the present application fixes the iron core and the coil to the mass block to form a vibration assembly, and fixes the magnetic steel to the housing to form a stator assembly, thereby greatly improving the electromagnetic field utilization rate of the iron core and the coil, improving the magnetic field strength of the magnetic steel, significantly enhancing the driving force of the linear vibration motor, and improving the vibration performance of the linear vibration motor.

[0031] The above are only embodiments of the present application, and those skilled in the art to which the present application pertains can make various modifications without departing from the creative concept of the present application, and all of these should be understood to fall within the protection scope of the present application.

Claims

1. A linear vibration motor, comprising: a housing having an accommodation space, a vibration assembly and a stator assembly accommodated in the accommodation space, and an elastic member for supporting the vibration assembly in the accommodation space; the vibration assembly includes a mass block suspended in the accommodation space, and the mass block is provided with an accommodation hole penetrating therethrough; the vibration assembly further includes an iron core fixed to the mass block and accommodated in the accommodation hole, and a coil wound around the iron core; the stator assembly includes a magnetic steel fixed to the housing, and the magnetic steel extends into the accommodation hole and is disposed opposite to the coil and the mass block with a gap therebetween. The linear vibration motor is characterized by the above.

2. The mass block includes side walls formed to surround the accommodation hole, and an end of the iron core is fixed to the side walls. The linear vibration motor according to claim 1 is characterized by the above.

3. The mass block is rectangular, and the side walls include a first side wall extending along the longitudinal direction and provided opposite to each other, and a second side wall extending along the short side direction and provided opposite to each other. The linear vibration motor according to claim 2 is characterized by the above.

4. The magnetic steel includes a first magnetic steel provided on both sides of the coil along a first direction, and a second magnetic steel provided on both sides of the coil along a second direction. The first magnetic steel and the second magnetic steel are provided to surround the coil with a gap on the circumferential side thereof. The first direction, the second direction and the vibration direction of the vibration assembly are perpendicular to each other in pairs. The linear vibration motor according to claim 3 is characterized by the above.

5. The first magnetic steel is magnetized along the first direction, and two of the first magnetic steels are installed with the same poles facing each other along the first direction. The second magnetic steel is magnetized along the second direction, and two of the second magnetic steels are installed with the same poles facing each other along the second direction. The linear vibration motor according to claim 4 is characterized by the above.

6. Both the first magnetic steel and the second magnetic steel have a three-stage magnetization structure. The linear vibration motor according to claim 5 is characterized by the above.

7. On one side of the coil along the first direction, three of the first magnetic steels arranged in order along the vibration direction are provided. The magnetization direction of the first magnetic steel located at the middle position is opposite to the magnetization directions of the first magnetic steels located at both ends. On one side of the coil along the second direction, three of the second magnetic steels arranged in order along the vibration direction are provided. The magnetization direction of the second magnetic steel located at the middle position is opposite to the magnetization directions of the second magnetic steels located at both ends. The linear vibration motor according to claim 5, characterized in that.

8. The mass block further includes a fixed boss formed to protrude from the second side wall, and an end of the iron core is fixed to the fixed boss. The linear vibration motor according to claim 3, characterized in that.

9. The iron core includes an end face fixed to the fixed boss, and the iron core is provided with an adhesive accommodation groove formed to be recessed in a direction away from the fixed boss from the end face. The linear vibration motor according to claim 8, characterized in that.

10. The housing includes an upper cover and a lower cover installed to face each other with a gap therebetween, and a side wall connecting the upper cover and the lower cover. The upper cover, the lower cover, and the side wall together surround to form the accommodation space. One end of the elastic member is fixed to the side wall, and the other end is fixed to the mass block. The two second magnetic steels are respectively fixed to the upper cover and the lower cover. The linear vibration motor according to claim 4, characterized in that.

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