Foam structure, linear vibration motor and electronic device

Abstract

The present invention relates to the technical field of vibration motors, and specifically relates to a foam structure, a linear vibration motor and an electronic device. The foam structure is used for a linear vibration motor, and the linear vibration motor comprises a housing and a vibrator assembly suspended in the housing by means of metal elastic pieces and capable of vibrating in a vibration direction. The foam structure comprises a foam body; the foam body comprises a first side surface and a second side surface arranged opposite to each other in a first direction, and a third side surface and a fourth side surface which are arranged in a second direction; and the third side surface is provided with through recesses arranged in the second direction, and the width of the through recesses gradually increases in the second direction. The foam structure is connected to the vibrator assembly by means of the first side surface, and is fitted with vibration arms of the metal elastic pieces by means of the through recesses. By providing the foam structure having the structure, the mounting consistency of the foam structure in the linear vibration motor can be ensured, thereby ensuring the performance consistency of the linear vibration motor.

Description

Foam structure, linear vibration motor and electronic device TECHNICAL FIELD

[0001] The present application belongs to the technical field of vibration motor, and particularly relates to a foam structure, a linear vibration motor and an electronic device. BACKGROUND

[0002] The linear vibration motor is widely used in consumer electronic products such as mobile phones and tablets due to its small size, and uses vibration instead of sound. The linear vibration motor generally comprises a shell, a vibrator assembly and a stator assembly accommodated in the shell. The vibrator assembly is supported in the shell by a metal spring and can reciprocate under the driving of the stator assembly. In the related art, a damping member is usually arranged between the shell and the vibrator assembly to prevent the vibrator assembly and the shell from colliding with each other and emitting sound.

[0003] However, since the damping member is connected between the shell and the vibrator assembly, and the shell and the vibrator assembly are not fixed in position due to being connected by the metal spring with elastic deformation, the position of the damping member is inconsistent when assembled.

[0004] Therefore, the present application is proposed in view of the above problems. SUMMARY

[0005] The present application aims to provide a foam structure, a linear vibration motor and an electronic device to solve the problem of inconsistent position of the damping member in the linear vibration motor in the prior art.

[0006] The first aspect of the present application provides a foam structure for a linear vibration motor, the linear vibration motor comprising a shell and a vibrator assembly suspended in the shell by a metal spring and capable of vibrating in a vibration direction; the foam structure comprising a foam body, the foam body comprising a first side surface, a second side surface arranged opposite to the first side surface along a first direction, and a third side surface, a fourth side surface arranged along a second direction, the first direction being perpendicular to the second direction, the third side surface being provided with a through slot arranged along the second direction, and the width of the through slot gradually increasing along the second direction.

[0007] The foam structure is connected to the vibrator assembly by the first side surface and is clamped to the vibration arm of the metal spring by the through slot.

[0008] The foam structure provided by the present application can further have the following additional technical features:

[0009] In one specific embodiment of the present application, the number of through slots is multiple, and the multiple through slots are arranged at intervals along the first direction on the third side surface.

[0010] In one specific embodiment of the present application, the depth l of the through slot and the length l of the foam body satisfy: 0.5L≤l≤0.8L.

[0011] In one specific embodiment of the present application, the foam body is cuboid.

[0012] In one specific embodiment of the present application, the through slot is a laser cutting forming structure.

[0013] The second aspect of the present application provides a linear vibration motor, comprising a shell, a vibrator assembly, a stator assembly, a metal spring and the foam structure of any one of the above accommodated in the shell, the metal spring is arranged oppositely and supports the vibrator assembly in the shell, the foam body is clamped on the metal spring through the through slot, and the first side surface is connected with the vibrator assembly, the bottom of the through slot abuts against the side edge of the metal spring in the non-vibration direction.

[0014] In one specific embodiment of the present application, the first side surface is glued and fixed with the vibrator assembly.

[0015] In one specific embodiment of the present application, the metal spring comprises a first connecting part, a second connecting part and a vibration arm connected between the first connecting part and the second connecting part, and the vibration arm comprises two elastic arms arranged in a U shape or a V shape.

[0016] The foam body is provided with one through slot, the first side surface of the foam body is connected with the vibrator assembly, and the through slot is clamped on the elastic arm close to the vibrator assembly.

[0017] In one specific embodiment of the present application, the metal spring comprises a first connecting part, a second connecting part and a vibration arm connected between the first connecting part and the second connecting part, and the vibration arm comprises two elastic arms arranged in a U shape or a V shape.

[0018] The foam body is provided with two through slots, the first side surface of the foam body is connected with the vibrator assembly, the second side surface is connected with the shell, and the two through slots are clamped on the two elastic arms respectively.

[0019] The third aspect of the present application further provides an electronic device comprising the linear vibration motor of any one of the above.

[0020] The foam structure provided by this invention features a first side surface and a second side surface positioned opposite each other along a first direction, a third side surface and a fourth side surface positioned along a second direction, and a through groove positioned on the third side surface along the second direction. The width of the through groove gradually widens along the second direction. This allows the foam body to be positioned in the non-vibration direction by fitting and connecting the through groove with at least one spring arm of the vibrating arm of the metal spring during assembly. The first side surface of the foam body is fitted and connected with the side of the vibrator assembly, thus fixing the foam structure relative to the vibrator assembly and the metal spring. Finally, the metal spring is connected to the housing for relative fixation. Furthermore, based on these connections, the assembly consistency of the foam structure within the linear vibration motor can be ensured, thereby guaranteeing the performance consistency of the linear vibration motor. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 is a three-dimensional structural diagram of the foam structure in an embodiment of the present invention;

[0023] Figure 2 shows the top view and front view of the foam structure in Figure 1;

[0024] Figure 3 is a schematic diagram of an assembly of foam structure, oscillator assembly, and metal spring sheet;

[0025] Figure 4 shows the assembly diagrams of the foam structure, oscillator assembly, and metal spring sheet from different perspectives.

[0026] Figure 5 is a top view of part of the structure of the linear vibration motor;

[0027] Figure 6 is a three-dimensional structural diagram of the foam structure in another embodiment of the present invention;

[0028] Figure 7 shows the assembly diagrams of the foam structure, oscillator assembly, and metal spring sheet from different perspectives in Figure 6.

[0029] Explanation of reference numerals in the attached drawings: 100-Linear vibration motor; 10-Foam structure; 11-First side; 12-Third side; 15-Sixth side; 14-Through groove; 20-Metal spring; 21-First connecting part; 22-Second connecting part; 23-Vibration arm; 30-Oscillator assembly; 40-Housing. Detailed Implementation

[0030] Exemplary embodiments of the present application will be described more fully hereinafter with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it is to be understood that the present application can be embodied in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0031] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and the like are to be construed to be inclusive (i.e., to include both instances of open ended terms and instances of terms limiting to a specific number) unless otherwise indicated as otherwise limited by context. The methods described herein can be implemented as a method, an apparatus, a system, a computer program product, or any combination thereof.

[0032] Although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first", "second", and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0033] For ease of description, spatial relative terms can be used herein to describe the relationship of one element or feature to another element or feature as shown in the figures, such as "inner", "outer", "inner side", "outer side", "under", "below", "above", "on", and the like. Such spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, then an element described as "below" or "under" another element or feature would then be oriented "above" or "on" the other element or feature. Thus, the example term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0034] The present application provides a foam structure 10 which can be used in a linear vibration motor 100, and particularly applied to a linear vibration motor 100 with two vibration arms 23 of a metal spring 20 to solve the problem of inconsistent position of the foam after assembly which affects the performance of the linear vibration motor 100.

[0035] Referring to FIGS. 1-7, the present application provides a foam structure 10 for a linear vibration motor 100, the linear vibration motor 100 comprising a housing 40 and a vibrator assembly 30 suspended in the housing 40 by a metal spring 20 and capable of vibrating in a vibration direction; the foam structure 10 comprises a foam body comprising a first side 11, a second side arranged opposite to the first side in a first direction, a third side 12 and a fourth side arranged in a second direction, the first direction being perpendicular to the second direction, the third side 12 being provided with a through slot 14 arranged in the second direction, and the width of the through slot 14 gradually increasing in the second direction; wherein the foam structure 10 is connected to the vibrator assembly 30 through the first side 11, and is clamped to the vibration arm 23 of the metal spring 20 through the through slot 14.

[0036] Specifically, the foam body is a one-piece structure, and particularly comprises a first side 11, a second side arranged opposite to the first side in a first direction, a third side 12 and a fourth side arranged in a second direction, and a fifth side and a sixth side 15 arranged opposite to each other in a third direction, the first direction, the second direction and the third direction being perpendicular to each other. The middle part of the third side 12 is provided with a through slot 14 arranged in the second direction, the two ends of the through slot 14 extending to the fifth side and the sixth side 15 respectively, and the width of the through slot 14 gradually increasing in the second direction, i.e. the width gradually increasing from the fifth side to the sixth side 15.

[0037] The foam structure 10 in the embodiment is applied to a linear vibration motor 100 with a metal spring 20 having two elastic arms. Specifically, the metal spring 20 comprises a first connecting portion 21, a second connecting portion 22, and an elastic arm 23 connected between the first connecting portion 21 and the second connecting portion 22, and the elastic arm 23 comprises two elastic arms arranged in a U shape. During assembly, first, the slot of the foam body is mounted on the elastic arm of the metal spring 20 close to the side of the vibrator assembly 30, and the fifth side of the foam body after mounting corresponds to the side of the connecting end of the two elastic arms, and the sixth side 15 corresponds to the side of the first connecting portion 21 and the second connecting portion 22, and the groove bottom of the through groove 14 abuts against the side edge of the non-vibration direction of the elastic arm of the metal spring 20 to position, and then the first side 11 of the foam structure 10 (i.e. the side adjacent to the vibrator assembly 30) is connected to the side of the vibrator assembly 30, so that the positioning and connection of the foam structure 10, the vibrator assembly 30 and the metal spring 20 are realized, and then the vibrator assembly 30 and the foam structure 10 are assembled into the linear vibration motor 100 by connecting the metal spring 20 and the shell 40 of the linear vibration motor 100.

[0038] The foam structure 10 provided by the application comprises a foam body, and the foam body comprises a first side 11 and a second side arranged opposite to the first side 11 in a first direction, a third side 12 and a fourth side arranged in a second direction, and a through groove 14 arranged on the third side 12 in the second direction, and the width of the through groove 14 gradually increases in the second direction. Thus, during assembly, the foam body through groove 14 and at least one elastic arm of the elastic arm 23 of the metal spring 20 are adaptively connected, and then the positioning of the foam body in the non-vibration direction is realized, the first side 11 of the foam body and the side of the vibrator assembly 30 are adaptively connected, and then the relative fixation of the foam structure 10, the vibrator assembly 30 and the metal spring 20 is realized, and then the relative fixation with the shell 40 is realized by connecting the metal spring 20 and the shell 40. Based on the above connection, the assembly consistency of the foam structure 10 in the linear vibration motor 100 can be ensured, and then the performance consistency of the linear vibration motor 100 can be ensured.

[0039] In one specific embodiment of the application, the number of through grooves 14 is multiple, and the multiple through grooves 14 are arranged in the first direction and spaced apart from each other on the third side 12. Thus, each elastic arm of the elastic arm 23 of the metal spring 20 is correspondingly arranged with a through groove 14, and the width of the foam structure 10 can be correspondingly increased, the connection strength of the metal spring 20 and the foam structure 10 can be increased, and then the damping effect of the foam structure 10 can be increased.

[0040] In one specific embodiment of the present application, the depth l of the through groove 14 and the length l of the foam body satisfy: 0.5L≤l≤0.8L. Specifically, the depth l of the through groove 14 is 0.5L, 0.6L, 0.7L or 0.8L. By setting the above parameter relationship, the contact area of the foam body and the vibrating arm 23 can be increased, so that the connection strength of the foam body and the vibrating arm 23 can be increased, and thus the service life of the linear vibration motor 100 is improved.

[0041] In one specific embodiment of the present application, the foam body is in the shape of a cuboid. In this way, the processing of the foam body is facilitated. Of course, in other embodiments, the foam structure 10 can also be other polyhedral structures, which can be set as needed.

[0042] In one specific embodiment of the present application, the through groove 14 is a laser cutting and forming structure. In this way, the processing of the through groove 14 is facilitated, and thus the processing efficiency of the foam structure 10 is improved.

[0043] The second aspect of the present application provides a linear vibration motor 100, which comprises a shell 40, a vibrator assembly 30, a stator assembly, a metal spring 20 and the foam structure 10 according to any one of the above embodiments, the metal spring 20 is arranged opposite to each other and supports the vibrator assembly 30 suspended in the shell 40, the foam body is clamped to the metal spring 20 through the through groove 14, and the first side surface 11 is connected to the vibrator assembly 30, and the groove bottom of the through groove 14 abuts against the side edge of the metal spring 20 in the non-vibration direction.

[0044] Specifically, the shell 40 comprises an upper shell forming an open cavity and a lower shell covering the opening of the open cavity, and the upper shell and the lower shell are adapted to form a receiving cavity. The stator assembly comprises a circuit board and a coil electrically connected to the circuit board, and the circuit board and the coil are connected to the lower shell. The vibrator assembly 30 is arranged above the stator assembly and specifically comprises a mass block and a magnetic steel connected as one body.

[0045] The number of metal springs 20 is two, and the two metal springs 20 are arranged on both sides of the vibrator assembly 30 along the long axis direction of the shell 40, and one end of each metal spring 20 is connected to the inner wall of the shell 40, and the other end is connected to the vibrator assembly 30, so that the vibrator assembly 30 is suspended above the stator assembly, so that the vibrator assembly 30 can reciprocate along the long axis direction of the shell 40 under the drive of the stator assembly.

[0046] The number of the foam structures 10 is two, and the specific structure refers to the above embodiment, two foam structures 10 are respectively clamped on the vibration arms 23 of the two metal springs 20 through the through grooves 14, and the first side surface 11 of the foam body is connected with the side surface of the vibrator assembly 30, and the second side surface is not in abutment with the metal spring 20 or the inner wall of the shell 40, and is used for providing vibration damping for the vibrator assembly 30.

[0047] In one specific embodiment of the present application, the first side surface 11 is glued and fixed with the vibrator assembly 30. Specifically, by gluing on the mass block of the vibrator assembly 30 and pasting the first side surface 11 of the foam body to the mass block, the fixed connection of the foam structure 10 and the vibrator assembly 30 can be realized.

[0048] In one specific embodiment of the present application, the metal spring 20 includes a first connecting portion 21, a second connecting portion 22 and a vibration arm 23 connected between the first connecting portion 21 and the second connecting portion 22, the vibration arm 23 includes two elastic arms arranged in a U-shaped or V-shaped manner; the foam body is provided with one through groove 14, the first side surface 11 of the foam body is connected with the vibrator assembly 30, and the through groove 14 is clamped on the elastic arm close to the vibrator assembly 30. In this way, the first side surface 11 of the foam is connected with the mass block of the vibrator assembly 30, and the second side surface is matched with the elastic arm of the metal spring 20, that is, the foam structure 10 acts between the elastic arms of the metal spring 20 and the mass block and the metal spring 20.

[0049] In one specific embodiment of the present application, the metal spring 20 includes a first connecting portion 21, a second connecting portion 22 and a vibration arm 23 connected between the first connecting portion 21 and the second connecting portion 22, the vibration arm 23 includes two elastic arms arranged in a U-shaped or V-shaped manner; the foam body is provided with two through grooves 14, the first side surface 11 of the foam body is connected with the vibrator assembly 30, and the second side surface is connected with the shell 40, and the two through grooves 14 are respectively clamped on the two elastic arms. In this way, the first side surface 11 of the foam is connected with the mass block of the vibrator assembly 30, and the second side surface is matched with the inner wall of the shell 40, that is, the foam structure 10 acts between the elastic arms of the metal spring 20 and the mass block, the metal spring 20 and the shell 40.

[0050] The third aspect of the present application also provides an electronic device comprising the linear vibration motor 100 of any one of the above.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A foam structure for a linear vibration motor, characterized by, The linear vibration motor comprises a shell and a vibrator assembly suspended in the shell by a metal spring and capable of vibrating in a vibration direction; the foam structure comprises a foam body comprising a first side face, a second side face arranged opposite to the first side face in a first direction, and a third side face, a fourth side face arranged in a second direction, the first direction being arranged perpendicular to the second direction, the third side face being provided with a through slot arranged in the second direction, and the width of the through slot gradually increasing along the second direction; The foam structure is connected to the vibrator assembly through the first side face, and is clamped to the vibration arm of the metal spring through the through slot.

2. The foam structure of claim 1, wherein, The number of the through slots is multiple, and the multiple through slots are arranged in the first direction and spaced apart on the third side face.

3. The foam structure of claim 1, wherein, The depth l of the through slot and the length L of the foam body satisfy 0.5L≤l≤0.8L.

4. The foam structure of claim 1, wherein, The foam body is arranged in a cuboid shape.

5. The foam structure of claim 1 wherein, The through slot is a laser cutting forming structure.

6. A linear vibration motor characterized by The linear vibration motor comprises a shell and a vibrator assembly, a stator assembly, a metal spring and the foam structure according to any one of claims 1-5, the metal spring being arranged opposite to each other and supporting the vibrator assembly in the shell, the foam body being clamped to the metal spring through the through slot, and the first side face being connected to the vibrator assembly, the bottom of the through slot and the side of the metal spring in the non-vibration direction abutting against each other.

7. The linear vibration motor of claim 6, wherein, The first side face is glued and fixed to the vibrator assembly.

8. The linear vibration motor of claim 6, wherein, The metal spring comprises a first connecting portion, a second connecting portion and a vibration arm connected between the first connecting portion and the second connecting portion, the vibration arm comprising two elastic arms arranged in a U shape or a V shape; The foam body is provided with one through slot, the first side face of the foam body being connected to the vibrator assembly, and the through slot being clamped to the elastic arm close to the vibrator assembly.

9. The linear vibration motor of claim 6, wherein, The metal spring comprises a first connecting portion, a second connecting portion and a vibration arm connected between the first connecting portion and the second connecting portion, the vibration arm comprising two elastic arms arranged in a U shape or a V shape; The foam body is provided with two through slots, the first side face of the foam body being connected to the vibrator assembly, the second side face being connected to the shell, and the two through slots being clamped to the two elastic arms respectively.

10. An electronic device, comprising: The linear vibration motor according to any one of claims 6-9.

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