Linear vibration motor
By adopting a novel elastic element structure in the linear vibration motor, including a fixed part, an elastic arm, and a mass block protrusion, the problem of large space occupation by the elastic element is solved, and greater vibration amplitude and better vibration performance are achieved.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- AAC MICROTECH (CHANGZHOU) CO LTD
- Filing Date
- 2025-01-16
- Publication Date
- 2026-07-23
AI Technical Summary
In existing linear vibration motors, the elastic element structure is large, which results in occupying a lot of storage space, limiting the volume of the mass block, and affecting vibration performance.
An elastic member structure is adopted, which includes a fixing part fixed to the side wall and a mass block and an elastic part connected thereto. The elastic part consists of two spaced elastic arms, and a protrusion is provided on the mass block to reduce the overall structural size and increase the volume of the mass block.
While maintaining constant stiffness and stress, the structural dimensions of the elastic element were reduced and the volume of the mass block was increased, thereby improving the vibration amplitude and vibration performance.
Smart Images
Figure CN2025072727_23072026_PF_FP_ABST
Abstract
Description
Linear vibration motor Technical Field
[0001] This invention relates to the field of linear motors, and more particularly to a linear vibration motor. Background Technology
[0002] The linear vibration motor of the related technology includes a housing with a receiving space, a vibration unit located in the housing, elastic members respectively fixed on both sides of the vibration unit and fixed and suspended in the receiving space, and a coil fixed to the base. The magnetic field generated by the coil interacts with the magnetic field generated by the vibration unit, thereby driving the vibration unit to perform reciprocating linear motion to generate vibration. Technical issues
[0003] In existing technologies, the elastic element structure includes a single elastic arm. To meet the specific resonant frequency performance requirements of linear vibration motors, the overall size of the elastic element is relatively large, making it more prone to plastic deformation. Furthermore, given a fixed housing space for the linear vibration motor, the presence of the large elastic element structure occupies a significant portion of the internal space, limiting the volume of the mass block within the vibration unit and consequently affecting the vibration performance of the linear vibration motor.
[0004] Therefore, it is necessary to provide a new linear vibration motor to solve the above problems. Technical solutions
[0005] This invention provides a linear vibration motor, comprising a housing with a receiving space, a vibration unit disposed in the housing, a coil disposed at a distance from the vibration unit along a first direction perpendicular to the vibration direction, and an elastic element fixed to the vibration unit and suspending the vibration unit in the housing. The housing includes a cover plate disposed at a distance from the vibration unit, a base for fixing the coil, and a side wall connecting the cover plate and the base. The vibration unit includes a mass block fixedly connected to the elastic element and a magnet unit embedded in the mass block. The elastic element includes a first fixing part fixed to the side wall, a second fixing part fixed to the mass block, and an elastic part connecting the first fixing part and the second fixing part. The elastic part includes two elastic arms disposed at a distance along the first direction. The mass block includes a main body fixedly connected to the second fixing part, and the main body includes a side surface connected to the second fixing part. The mass block also includes a protrusion extending from the side surface toward the side wall along the vibration direction. The elastic part and the protrusion are disposed at a distance from each other along a second direction perpendicular to both the vibration direction and the first direction.
[0006] Preferably, the orthographic projection of the elastic arm along the second direction at least partially falls into the protrusion.
[0007] Preferably, the elastic arm is V-shaped and includes a first elastic arm connected to the first fixing part, a second elastic arm connected to the second fixing part, and a bent part connecting the first elastic arm and the second elastic arm. The opening formed by the first elastic arm and the second elastic arm is away from the protrusion along the second direction.
[0008] Preferably, the side surface includes a first side surface connected to the second fixing part and a second side surface spaced apart from the elastic part along the vibration direction, wherein the distance between the second side surface and the side wall along the vibration direction is greater than the distance between the first side surface and the side wall along the vibration direction.
[0009] Preferably, the distance between the second side and the sidewall along the vibration direction gradually increases from the first side toward the protrusion.
[0010] Preferably, the first fixing part and the second fixing part are arranged at intervals relative to each other along the vibration direction.
[0011] Preferably, there are two elastic elements, which are disposed on opposite sides of the vibration unit along the vibration direction. There are also two protrusions, which are disposed on opposite sides of the main body along the vibration direction.
[0012] Preferably, the two elastic elements are arranged symmetrically along the central axis of the mass block parallel to the second direction, and the two protrusions are arranged symmetrically along the central axis of the mass block parallel to the second direction, and the protrusions and the main body are integrally formed. Beneficial effects
[0013] Compared with the prior art, the elastic element in the linear vibration motor provided by the present invention includes a first fixing part fixed to the side wall, a second fixing part fixed to the mass block, and an elastic part connecting the first fixing part and the second fixing part. The elastic part includes two elastic arms spaced apart along the first direction, which effectively reduces the overall structural size of the elastic element while ensuring that the stiffness and stress of the elastic element remain unchanged. The mass block also includes protrusions extending from the side along the vibration direction toward the side wall. The elastic part and the protrusions are spaced apart relative to each other along a second direction perpendicular to the vibration direction and the first direction. Since the structural size of the elastic element reduces the space occupied, the volume of the mass block is increased, thereby achieving a larger vibration amount and further improving the vibration performance of the linear vibration motor. Attached Figure Description
[0014] Figure 1 is a three-dimensional structural diagram of the linear vibration motor in an embodiment of the present invention;
[0015] Figure 2 is an exploded view of the linear vibration motor in Figure 1;
[0016] Figure 3 is a cross-sectional view along line AA in Figure 1;
[0017] Figure 4 is a schematic diagram of the combined structure of the mass block, elastic element and sidewall in the linear vibration motor of Figure 1;
[0018] Figure 5 is a schematic diagram of the elastic element of the linear vibration motor in Figure 1;
[0019] Figure 6 is a top view of the combined structure of the mass block, elastic element and base in the linear vibration motor of Figure 1;
[0020] Figure 7 is a front view of the combined structure of the mass block and elastic element in the linear vibration motor of Figure 1. Embodiments of the present invention
[0021] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.
[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0023] Referring to Figures 1, 2, and 3, this embodiment provides a linear vibration motor 100, including a housing 200 with a receiving space 201, a vibration unit 30 disposed in the housing 200, a coil 40 disposed at a distance from the vibration unit 30 along a first direction 01 perpendicular to the vibration direction 03, and an elastic member 70 fixed to the vibration unit 30 and suspending the vibration unit 30 in the housing 200. The housing 200 includes a cover plate 210 spaced apart from the vibration unit 30, a base 220 for fixing the coil 40, and a side wall 230 connecting the cover plate 210 and the base 220, which together form the receiving space 201. In this embodiment, the cover plate 210 and the side wall 230 are square.
[0024] Referring to Figures 2 and 3, the vibration unit 30 includes a mass block 310 with a central through hole 301 and a magnet unit 320 assembled in the through hole 301.
[0025] Referring to Figures 2 and 3, the magnetic field generated by coil 40 interacts with the magnetic field generated by magnet unit 320, thereby driving vibration unit 30 to perform reciprocating linear motion and generate vibration. The linear vibration motor 100 is also provided with FPC board 60 for electrical connection with coil 40. Coil 40 is connected to external circuit through FPC board 60 to realize electrical signal input.
[0026] Referring to Figures 4, 5, and 6, the elastic element 70 structure provided by the present invention includes a first fixing part 710 fixed to the side wall 230, a second fixing part 720 fixed to the mass block 310, and an elastic part 730 connecting the first fixing part 710 and the second fixing part 720. The elastic part 730 includes two elastic arms 731 spaced apart along the first direction 01. The elastic element 70 proposed by the present invention has two elastic arms 731. Compared with the elastic elements in the prior art that only have a single elastic arm, the structural size of the elastic element 70 is reduced while ensuring that the overall stiffness and stress of the elastic element 70 remain unchanged, thereby providing more design space for the mass block 310. The present invention has two elastic elements 70, which are arranged on opposite sides of the vibration unit 30 along the vibration direction 03. The elastic elements 70 drive the vibration unit 30 to reciprocate along the vibration direction 03.
[0027] Referring to Figures 2, 4, and 6, in this embodiment, the mass block 310 includes a main body 311 located at the center. The main body 311 includes a side surface 312 connected to the elastic member 70. The mass block 310 also includes protrusions 313 extending from the side surface 312 along the vibration direction 03 toward the side wall 230 of the housing 200. The protrusions 313 of the mass block 310 and the elastic portion 730 of the elastic member 70 are spaced apart relative to each other along a second direction 02 perpendicular to the vibration direction 03 and the first direction 01. Because the overall size of the elastic member 70 is reduced, the space occupied by the elastic member 70 in the linear vibration motor 100 is reduced, the volume of the mass block 310 is increased, a larger vibration amplitude is achieved, and the vibration performance of the linear vibration motor 100 is effectively improved.
[0028] There are two protrusions 313, which are arranged symmetrically along the central axis of the mass block 310 parallel to the second direction O2. The protrusions 313 and the main body 311 are integrally formed. Therefore, the mass block 310 structure proposed in this invention has a larger volume than the mass blocks in the prior art, which further improves the performance of the linear vibration motor 100.
[0029] Referring to Figures 4, 5, and 6, the side surface 312 of the mass block 310 includes a first side surface 3121 connected to the second fixing part 720 and a second side surface 3122 spaced apart from the elastic part 730 along the vibration direction 03. The distance between the second side surface 3122 and the side wall 230 of the housing 200 along the vibration direction 03 is greater than the distance between the first side surface 3122 and the side wall 230 along the vibration direction 03. The distance between the second side surface 3122 and the side wall 230 along the vibration direction 03 gradually increases from the first side surface 3121 toward the protrusion. In this embodiment, the elastic arm 731 is V-shaped and includes a first elastic arm 7311 connected to the first fixing part 710, a second elastic arm 7312 connected to the second fixing part 720, and a bent part 733 connecting the first elastic arm 7311 and the second elastic arm 7312. The opening formed by the first elastic arm 7311 and the second elastic arm 7312 is located away from the protrusion 313 along the second direction 02. Referring to Figures 5 and 7, the orthographic projection of the elastic arm 731 along the second direction 02 at least partially falls into the protrusion 313.
[0030] Referring to Figure 2, the linear vibration motor 100 also includes two limiting bosses 80 located on the second side 3122 of the mass block 310. The limiting bosses 80 prevent the elastic arm 731 of the elastic element 70 from breaking when the amplitude of the vibration unit 30 is too large, thus preventing the linear vibration motor 100 from failing to work and improving its stability and reliability. In this embodiment, the limiting bosses 80 are preferably made of damping material, such as rubber.
[0031] Compared with the prior art, the elastic element 70 in the linear vibration motor 100 provided by the present invention includes a first fixing part 710 fixed to the side wall 230, a second fixing part 720 fixed to the mass block 310, and an elastic part 730 connecting the first fixing part 710 and the second fixing part 720. The elastic part 730 includes two elastic arms 731 spaced apart along the first direction 01. The overall structural size of the elastic element 70 is effectively reduced while ensuring that the stiffness and stress of the elastic element 70 remain unchanged. The mass block 310 also includes protrusions 313 extending from the side 312 toward the side wall 230 along the vibration direction 03. The elastic part 730 and the protrusions 313 are spaced apart relative to each other along the second direction 02 perpendicular to the vibration direction 03 and the first direction 01. Since the structural size of the elastic element 70 is reduced, the volume of the mass block 310 is increased, thereby achieving a larger vibration amount and further improving the vibration performance of the linear vibration motor 100.
[0032] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.
Claims
1. A linear vibration motor, comprising a housing having a receiving space, a vibration unit disposed in the housing, a coil disposed at a distance from the vibration unit along a first direction perpendicular to the vibration direction, and an elastic element fixed to the vibration unit and suspending the vibration unit in the housing, the housing comprising a cover plate spaced apart from the vibration unit, a base for fixing the coil, and a side wall connecting the cover plate and the base, the vibration unit comprising a mass block fixedly connected to the elastic element and a magnet unit embedded in the mass block, characterized in that, The elastic element includes a first fixing part fixed to the side wall, a second fixing part fixed to the mass block, and an elastic part connecting the first fixing part and the second fixing part. The elastic part includes two elastic arms spaced apart along the first direction, and the elastic arms are V-shaped. The mass block includes a main body fixedly connected to the second fixing part. The main body includes a side surface connected to the second fixing part. The mass block also includes a protrusion extending from the side surface toward the side wall along the vibration direction. The elastic part and the protrusion are spaced apart relative to each other along a second direction perpendicular to the vibration direction and the first direction.
2. The vibration motor according to claim 1, characterized in that, The orthographic projection of the elastic arm along the second direction at least partially falls into the protrusion.
3. The vibration motor according to claim 1, characterized in that, The elastic arm includes a first elastic arm connected to the first fixing part, a second elastic arm connected to the second fixing part, and a bent part connecting the first elastic arm and the second elastic arm. The opening formed by the first elastic arm and the second elastic arm is away from the protrusion along the second direction.
4. The vibration motor according to claim 1, characterized in that, The side surface includes a first side surface connected to the second fixing part and a second side surface spaced apart from the elastic part along the vibration direction. The distance between the second side surface and the side wall along the vibration direction is greater than the distance between the first side surface and the side wall along the vibration direction.
5. The vibration motor according to claim 4, characterized in that, The distance between the second side and the sidewall along the vibration direction gradually increases from the first side toward the protrusion.
6. The vibration motor according to claim 1, characterized in that, The first fixing part and the second fixing part are arranged at intervals relative to each other along the vibration direction.
7. The vibration motor according to claim 1, characterized in that, There are two elastic elements, which are disposed on opposite sides of the vibration unit along the vibration direction. There are also two protrusions, which are disposed on opposite sides of the main body along the vibration direction.
8. The vibration motor according to claim 7, characterized in that, The two elastic elements are arranged symmetrically along the central axis of the mass block parallel to the second direction, and the two protrusions are arranged symmetrically along the central axis of the mass block parallel to the second direction. The protrusions and the main body are integrally formed.