Linear vibration motor

Abstract

The linear vibration motor comprises a vibration unit arranged in a shell and an elastic piece which is fixed with the vibration unit and suspends the vibration unit in the shell, the vibration unit comprises a mass block fixedly connected with the elastic piece, and the elastic piece comprises an elastic part connected with two fixing parts. An elastic part comprises two elastic arms which are arranged at intervals in the first direction, a mass block comprises a main body part connected with an elastic part, the main body part comprises a side face connected with the elastic part, and the mass block further comprises protruding parts which protrude and extend towards a shell from the side face in the vibration direction. The elastic parts and the protruding parts are oppositely arranged at intervals in the second direction perpendicular to the vibration direction and the first direction, the problems that in the prior art, due to the fact that an elastic piece is only provided with a single elastic arm, the structure size is large, and plastic deformation is likely to happen are effectively solved, and meanwhile the size of the mass block is effectively increased; and the performance of the linear vibration motor is further improved.

Description

Technical Field

[0001] The invention relates to the field of linear motors, and in particular to a linear vibration motor. Background Art

[0002] The linear vibration motor of the related technology includes a shell with a receiving space, a vibration unit located in the shell, elastic members respectively fixed to 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 and generate vibration.

[0003] In the prior art, the elastic member structure includes a single elastic arm. In order to meet the performance requirements of the specific resonance frequency required by the linear vibration motor, the overall structural size of the elastic member is large and more prone to plastic deformation. At the same time, when the storage space of the linear vibration motor is certain, due to the presence of the large-sized elastic member structure, more storage space in the linear vibration motor is occupied, which limits the volume of the mass block in the vibration unit, thereby 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. Summary of the invention

[0005] The present invention provides a linear vibration motor, comprising a shell with a receiving space, a vibration unit arranged in the shell, a coil arranged relatively and spaced apart from the vibration unit along a first direction perpendicular to the vibration direction, and an elastic member fixed to the vibration unit and suspending the vibration unit in the shell, the shell comprising a cover plate arranged 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 member and a magnetic steel unit embedded in the mass block, the elastic member comprising a first fixing portion fixed to the side wall, a second fixing portion fixed to the mass block, and an elastic portion connecting the first fixing portion and the second fixing portion, the elastic portion comprising two elastic arms arranged spaced apart along the first direction, the mass block comprising a main body portion fixedly connected to the second fixing portion, the main body portion comprising a side surface connected to the second fixing portion, the mass block further comprising a protruding portion protruding and extending from the side surface toward the side wall along the vibration direction, and the elastic portion and the protruding portion are arranged relatively and spaced apart along a second direction perpendicular to 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 protruding portion.

[0007] Preferably, the elastic arm is V-shaped, comprising a first elastic arm connected to the first fixed portion, a second elastic arm connected to the second fixed portion, and a bending portion connecting the first elastic arm and the second elastic arm, and an opening surrounded by the first elastic arm and the second elastic arm is away from the protruding portion along the second direction.

[0008] Preferably, the side surface includes a first side surface connected to the second fixing portion and a second side surface spaced apart from the elastic portion along the vibration direction, and 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 surface and the side wall along the vibration direction gradually increases from the first side surface toward the protruding portion.

[0010] Preferably, the first fixing portion and the second fixing portion are arranged relatively spaced apart along the vibration direction.

[0011] Preferably, there are two elastic members, which are arranged on opposite sides of the vibration unit along the vibration direction, and there are two protrusions, which are arranged on opposite sides of the main body along the vibration direction.

[0012] Preferably, the two elastic members are centrally symmetrically arranged along the central axis of the mass block parallel to the second direction, the two protrusions are centrally symmetrically arranged along the central axis of the mass block parallel to the second direction, and the protrusions and the main body are integrally formed.

[0013] Compared with the prior art, the elastic part 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 arranged at intervals along the first direction, and the overall structural size of the elastic part is effectively reduced while ensuring that the stiffness and stress of the elastic part 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 protrusion are relatively spaced along the second direction perpendicular to the vibration direction and the first direction. Since the structural size of the elastic part 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the three-dimensional structure of a linear vibration motor in an embodiment of the present invention; Figure 2for Figure 1 Exploded diagram of the linear vibration motor in; Figure 3 For along Figure 1 Sectional view along line AA; Figure 4 for Figure 1 Schematic diagram of the combined structure of the mass block, the elastic member and the side wall in the linear vibration motor; Figure 5 for Figure 1 A schematic structural diagram of an elastic member of a linear vibration motor; Figure 6 for Figure 1 A top view of the combined structure of the mass block, the elastic member and the base in the linear vibration motor; Figure 7 for Figure 1 Front view of the combined structure of the mass block and the elastic part in the linear vibration motor. DETAILED DESCRIPTION

[0015] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0016] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0017] See also Figure 1 , Figure 2 and Figure 3 The present embodiment provides a linear vibration motor 100, comprising a housing 200 having a receiving space 201, a vibration unit 30 disposed in the housing 200, a coil 40 disposed relatively spaced apart 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 comprises 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 enclose the receiving space 201. In the present embodiment, the cover plate 210 and the side wall 230 are square.

[0018] See also Figure 2 and Figure 3 The vibration unit 30 includes a mass block 310 having a middle through hole 301 and a magnetic steel unit 320 assembled in the through hole 301 .

[0019] See also Figure 2 and Figure 3 The magnetic field generated by the coil 40 interacts with the magnetic field generated by the magnetic steel unit 320, thereby driving the vibration unit 30 to make a reciprocating linear motion to generate vibration. The linear vibration motor 100 is also provided with an FPC board 60 for electrical connection with the coil 40, and the coil 40 is connected to an external circuit through the FPC board 60 to realize electrical signal input.

[0020] See also Figure 4 , Figure 5 and Figure 6 The elastic member 70 structure provided by the present invention includes a first fixing portion 710 fixed to the side wall 230, a second fixing portion 720 fixed to the mass block 310, and an elastic portion 730 connecting the first fixing portion 710 and the second fixing portion 720, and the elastic portion 730 includes two elastic arms 731 arranged at intervals along the first direction 01. The elastic member 70 proposed by the present invention has two elastic arms 731. Compared with the elastic member with only a single elastic arm in the prior art, the structural size of the elastic member 70 is reduced while ensuring that the overall stiffness and stress of the elastic member 70 remain unchanged, thereby providing more design space for the mass block 310. There are two elastic members 70 of the present invention, which are arranged on opposite sides of the vibration unit 30 along the vibration direction 03. The elastic member 70 drives the vibration unit 30 to vibrate back and forth along the vibration direction 03.

[0021] See also Figure 2 , Figure 4 and Figure 6 In this embodiment, the mass block 310 includes a main body 311 located at the center, the main body 311 includes a side 312 connected to the elastic member 70, and the mass block 310 also includes a protrusion 313 protruding and extending from the side 312 along the vibration direction 03 toward the side wall 230 of the housing 200. The protrusion 313 of the mass block 310 and the elastic part 730 of the elastic member 70 are arranged relatively spaced along the second direction 02 perpendicular to the vibration direction 03 and the first direction 01. Since the overall size of the elastic member 70 is reduced, the accommodation 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 amount is achieved, and the vibration performance of the linear vibration motor 100 is effectively improved.

[0022] There are two protrusions 313, which are centrally symmetrically arranged along the central axis of the mass block 310 parallel to the second direction 02, and the protrusions 313 and the main body 311 are integrally formed. Therefore, the mass block 310 structure proposed in the present invention has a larger volume than the mass block in the prior art, further improving the performance of the linear vibration motor 100.

[0023] See also Figure 4 , Figure 5 and Figure 6, the side surface 312 of the mass block 310 includes a first side surface 3121 connected to the second fixing portion 720 and a second side surface 3122 spaced apart from the elastic portion 730 along the vibration direction 03, and the distance between the second side surface 3122 and the side wall 230 of the shell 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 protruding portion. The elastic arm 731 in this embodiment is V-shaped, and the elastic arm 731 includes a first elastic arm 7311 connected to the first fixing portion 710, a second elastic arm 7312 connected to the second fixing portion 720, and a bending portion 733 connecting the first elastic arm 7311 and the second elastic arm 7312. The opening surrounded by the first elastic arm 7311 and the second elastic arm 7312 is away from the protruding portion 313 along the second direction 02. See. Figure 5 and Figure 7 , the orthographic projection of the elastic arm 731 along the second direction 02 at least partially falls into the protrusion 313 .

[0024] See also Figure 2 The linear vibration motor 100 further includes two limiting bosses 80 located on the second side surface 3122 of the mass block 310. The setting of the limiting bosses 80 can prevent the elastic arm 731 of the elastic member 70 from breaking when the vibration unit 30 has an excessively large amplitude, thereby preventing the linear vibration motor 100 from failing to work, thereby improving its stability and reliability. In this embodiment, the limiting bosses 80 are preferably made of damping material, such as rubber.

[0025] Compared with the prior art, the elastic member 70 in the linear vibration motor 100 provided by the present invention includes a first fixing portion 710 fixed to the side wall 230, a second fixing portion 720 fixed to the mass block 310, and an elastic portion 730 connecting the first fixing portion 710 and the second fixing portion 720. The elastic portion 730 includes two elastic arms 731 spaced apart along the first direction 01, which effectively reduces the overall structural size of the elastic member 70 while ensuring that the stiffness and stress of the elastic member 70 remain unchanged. The mass block 310 also includes protrusions 313 protruding and extending from the side surface 312 along the vibration direction 03 toward the side wall 230. The elastic portion 730 and the protrusion 313 are relatively spaced apart along the second direction 02 perpendicular to the vibration direction 03 and the first direction 01. Since the structural size of the elastic member 70 reduces the space occupied, 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.

[0026] The above description is only an implementation mode of the present invention. It should be pointed out that, for ordinary technicians in this field, improvements can be made without departing from the creative concept of the present invention, but these all belong to the protection scope of the present invention.

Claims

1. A linear vibration motor, comprising a shell with a receiving space, a vibration unit arranged in the shell, a coil arranged relative to the vibration unit in a first direction perpendicular to the vibration direction, and an elastic member fixed to the vibration unit and suspending the vibration unit in the shell, the shell comprising a cover plate arranged 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 comprising a mass block fixedly connected to the elastic member and a magnetic steel unit embedded in the mass block, characterized in that: The elastic member includes a first fixing portion fixed to the side wall, a second fixing portion fixed to the mass block, and an elastic portion connecting the first fixing portion and the second fixing portion, the elastic portion includes two elastic arms spaced apart along the first direction, the elastic arms are V-shaped, the mass block includes a main body portion connected to the second fixing portion, the main body portion includes a side surface connected to the second fixing portion, the mass block also includes a protruding portion protruding and extending from the side surface toward the side wall along the vibration direction, and the elastic portion and the protruding portion are relatively spaced apart along a second direction perpendicular to the vibration direction and the first direction.

2. The vibration motor according to claim 1, characterized in that: An orthographic projection of the elastic arm along the second direction at least partially falls into the protruding portion.

3. The vibration motor according to claim 1, characterized in that: The elastic arm includes a first elastic arm connected to the first fixing portion, a second elastic arm connected to the second fixing portion, and a bending portion connecting the first elastic arm and the second elastic arm, and an opening surrounded by the first elastic arm and the second elastic arm is away from the protruding portion 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 portion and a second side surface spaced apart from the elastic portion along the vibration direction, and a distance between the second side surface and the side wall along the vibration direction is greater than a 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 surface and the side wall along the vibration direction gradually increases from the first side surface toward the protruding portion.

6. The vibration motor according to claim 1, characterized in that: The first fixing portion and the second fixing portion are arranged relatively and spaced apart along the vibration direction.

7. The vibration motor according to claim 1, characterized in that: There are two elastic members, which are arranged on opposite sides of the vibration unit along the vibration direction. There are two protrusions, which are arranged 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 members are centrally symmetrically arranged along the central axis of the mass block parallel to the second direction, the two protrusions are centrally symmetrically arranged along the central axis of the mass block parallel to the second direction, and the protrusions are integrally formed with the main body.

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