Foam structure, linear vibration motor and electronic equipment

Abstract

The utility model belongs to the technical field of vibration motors, and particularly relates to a foam structure, a linear vibration motor and electronic equipment. The foam structure is used for the linear vibration motor. The linear vibration motor comprises a shell and a vibrator assembly which is suspended in the shell through a metal elastic piece and can vibrate in the vibration direction. The foam structure comprises a foam body, the foam body comprises a first side face and a second side face which are oppositely arranged in the first direction and a third side face and a fourth side face which are arranged in the second direction, a through groove formed in the second direction is formed in the third side face, and the width of the through groove is gradually increased in the second direction; wherein the foam structure is connected to the vibrator assembly through the first side surface, and is clamped on the vibration arm of the metal elastic sheet through the through groove. By arranging the foam structure with the structure, the assembly consistency of the foam structure in the linear vibration motor can be ensured, and the performance consistency of the linear vibration motor is further ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of vibration motors, and particularly relates to a foam structure, a linear vibration motor and an electronic device. Background Art

[0002] Linear vibration motors are widely used in consumer electronic products such as mobile phones and tablets due to their small size, using vibration to replace sound. A linear vibration motor generally includes a housing and a vibrator assembly and a stator assembly accommodated in the housing. The vibrator assembly is supported in the housing by a metal shrapnel and can reciprocally vibrate under the drive of the stator assembly. In related technologies, in order to prevent the vibrator assembly from colliding with the housing and generating noise, a damping member is usually provided between the housing and the vibrator assembly.

[0003] However, since the damping member is connected between the housing and the vibrator assembly, and the positions of the housing and the vibrator assembly are relatively not fixed because they are connected by a metal shrapnel with elastic deformation, there is a problem that the position states of the damping member are inconsistent during assembly.

[0004] Therefore, in view of the above deficiencies, the present utility model is specifically proposed. Summary of the Utility Model

[0005] The purpose of the present utility model is to provide a foam structure, a linear vibration motor and an electronic device to solve the problem that the positions of damping members in linear vibration motors in the prior art are inconsistent.

[0006] The first aspect of the present utility model provides a foam structure for a linear vibration motor. The linear vibration motor includes a housing and a vibrator assembly suspended in the housing by a metal shrapnel and capable of vibrating along the vibration direction. The foam structure includes a foam body, which includes a first side surface and a second side surface oppositely arranged along a first direction, and a third side surface and a fourth side surface arranged along a second direction. The first direction is perpendicular to the second direction. A through groove is provided on the third side surface along the second direction, and the width of the through groove gradually increases along the second direction.

[0007] Wherein, the foam structure is connected to the vibrator assembly through the first side surface and is clamped to the vibration arm of the metal shrapnel through the through groove.

[0008] The foam structure provided by the present utility model may also have the following additional technical features:

[0009] In a specific embodiment of the present utility model, the number of the through grooves is multiple, and the multiple through grooves are spaced along the first direction on the third side surface.

[0010] In a specific embodiment of the present utility model, the depth l of the through groove and the length l of the foam body satisfy: 0.5L ≤ l ≤ 0.8L.

[0011] In a specific embodiment of the present utility model, the foam main body is arranged in a cuboid shape.

[0012] In a specific embodiment of the present utility model, the through groove is a laser cutting formed structure.

[0013] In a second aspect of the present utility model, there is provided a linear vibration motor, including a housing, and an oscillator assembly, a stator assembly, a metal shrapnel, and the foam structure according to any one of the above, which are received in the housing. The metal shrapnels are arranged in pairs and support and suspend the oscillator assembly in the housing. The foam body is clamped to the metal shrapnel through the through groove, and the first side surface is connected to the oscillator assembly, and the bottom of the through groove abuts against the side edge of the metal shrapnel in the non-vibration direction.

[0014] In a specific embodiment of the present utility model, the first side surface is fixedly bonded to the oscillator assembly.

[0015] In a specific embodiment of the present utility model, the metal shrapnel includes a first connecting portion, a second connecting portion, and a vibrating arm connected between the first connecting portion and the second connecting portion. The vibrating arm includes two elastic arms arranged in a U shape or a V shape.

[0016] One through groove is provided on the foam body. The first side surface of the foam body is connected to the oscillator assembly, and the through groove is clamped on the elastic arm close to the oscillator assembly.

[0017] In a specific embodiment of the present utility model, the metal shrapnel includes a first connecting portion, a second connecting portion, and a vibrating arm connected between the first connecting portion and the second connecting portion. The vibrating arm includes two elastic arms arranged in a U shape or a V shape.

[0018] Two through grooves are provided on the foam body. The first side surface of the foam body is connected to the oscillator assembly, and the second side surface is connected to the housing. The two through grooves are respectively clamped on the two elastic arms.

[0019] In a third aspect of the present utility model, there is also provided an electronic device, including the linear vibration motor according to any one of the above.

[0020] The foam structure provided by the present utility model is provided with a first side surface and a second side surface that are oppositely arranged along a first direction, a third side surface and a fourth side surface that are arranged along a second direction, and a through groove that is arranged on the third side surface along the second direction, and the width of the through groove is gradually widened along the second direction. In this way, during assembly, at least one elastic arm of the vibration arm of the metal elastic sheet can be adaptively connected to the through groove of the foam body, so as to realize the positioning of the foam body in the non-vibration direction. The first side surface of the foam body is adaptively connected to the side surface of the oscillator assembly, so as to realize the relative fixation of the foam structure, the oscillator assembly and the metal elastic sheet. Then, the relative fixation with the housing is realized by connecting the metal elastic sheet to the housing. And based on the above connections, the assembly consistency of the foam structure in the linear vibration motor can be guaranteed, and further the performance consistency of the linear vibration motor can be guaranteed. Brief Description of the Drawings

[0021] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a three-dimensional structure schematic diagram of the foam structure in the embodiment of the present utility model;

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

[0024] Figure 3 It is an assembly schematic diagram of the foam structure, the oscillator assembly and the metal elastic sheet;

[0025] Figure 4 It is an assembly schematic diagram of the foam structure, the oscillator assembly and the metal elastic sheet from different perspectives;

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

[0027] Figure 6 It is a three-dimensional structure schematic diagram of the foam structure in another embodiment of the present utility model;

[0028] Figure 7 It is Figure 6 the assembly schematic diagram of the foam structure, the oscillator assembly and the metal elastic sheet from different perspectives in.

[0029] Description of the Reference Numerals:

[0030] 100 - Linear Vibration Motor;

[0031] 10 - Foam structure, 11 - First side, 12 - Third side, 15 - Sixth side, 14 - Through groove;

[0032] 20 - Metal shrapnel, 21 - First connecting portion, 22 - Second connecting portion, 23 - Vibration arm;

[0033] 30 - Oscillator assembly, 40 - Housing. Detailed implementation mode

[0034] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be fully conveyed to those skilled in the art.

[0035] It should be understood that the terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0036] Although the terms first, second, third, etc. may be used in the text to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first" and "second" and other numerical terms used in the text do not imply an order or sequence. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0037] For ease of description, spatial relative relationship terms may be used in the text to describe the relationship of one element or feature shown in the figure with respect to another element or feature. These relative relationship terms are, for example, "inner", "outer", "inner side", "outer side", "below", "beneath", "above", "upper", etc. Such spatial relative relationship terms are intended to include different orientations of the device during use or operation other than the orientations depicted in the figure. For example, if the device in the figure is flipped, an element described as "below" or "beneath" other elements or features will then be oriented as "above" or "upper" other elements or features. Thus, the exemplary term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are accordingly interpreted.

[0038] The present utility model provides a foam structure 10, which can be used in a linear vibration motor 100, and is specifically applied to a linear vibration motor 100 in which a metal shrapnel 20 has two vibration arms 23, so as to solve the problem that the inconsistent position after the foam is assembled affects the product performance of the linear vibration motor 100 in the related art.

[0039] Referring to Figures 1-7 As shown, in a first aspect of the present utility model, there is provided a foam structure 10 for a linear vibration motor 100. The linear vibration motor 100 includes a housing 40 and a vibrator assembly 30 suspended in the housing 40 by a metal shrapnel 20 and capable of vibrating along a vibration direction. The foam structure 10 includes a foam body, and the foam body includes a first side surface 11, a second side surface oppositely arranged along a first direction, a third side surface 12, and a fourth side surface arranged along a second direction. The first direction is perpendicular to the second direction. A through groove 14 is provided on the third side surface 12 along the second direction, and the width of the through groove 14 gradually increases along the second direction. Wherein, the foam structure 10 is connected to the vibrator assembly 30 through the first side surface 11 and is clamped to the vibration arm 23 of the metal shrapnel 20 through the through groove 14.

[0040] Specifically, the foam body is an integral structure, and specifically includes a first side surface 11, a second side surface oppositely arranged along its first direction, a third side surface 12, a fourth side surface arranged along its second direction, and a fifth side surface and a sixth side surface 15 oppositely arranged along its third direction. The first direction, the second direction, and the third direction are perpendicular to each other pairwise. A through groove 14 is provided in the middle of the third side surface 12 along the second direction. The two ends of the through groove 14 respectively extend to the fifth side surface and the sixth side surface 15, and the width of the through groove 14 increases along the second direction, that is, the width increases from the fifth side surface to the sixth side surface 15.

[0041] The foam structure 10 in this embodiment is applied to a linear vibration motor 100 in which a metal dome 20 has two elastic arms. Specifically, the metal dome 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 shape. During assembly, first install the slot of the foam body on the elastic arm in the metal shrapnel 20 close to the vibrator assembly 30, and the fifth side of the installed foam body 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 part 21 and the second connecting part 22. The bottom of the through groove 14 abuts against the side edge of the elastic arm in the non-vibration direction of the metal shrapnel 20 for positioning, and then the first side 11 of the foam structure 10 (that is, the side adjacent to the vibrator assembly 30) is connected to the side of the vibrator assembly 30, so as to realize the positioning connection between the foam structure 10 and the vibrator assembly 30 and the metal shrapnel 20, and then the vibrator assembly 30 and the foam structure 10 are assembled into the linear vibration motor 100 by connecting the metal shrapnel 20 and the shell 40 of the linear vibration motor 100.

[0042] The foam structure 10 provided by the present invention comprises a first side surface 11 and a second side surface arranged opposite each other along a first direction, a third side surface 12 and a fourth side surface arranged along a second direction, and a through-slot 14 provided on the third side surface 12 along the second direction. The through-slot 14 is configured to gradually widen along the second direction. This allows the through-slot 14 in the foam body to be adapted and connected to at least one of the vibrating arms 23 of the metal dome 20 during assembly, thereby achieving positioning of the foam body in the non-vibration direction. The first side surface 11 of the foam body is adapted and connected to the side surface of the vibrator assembly 30, thereby achieving relative fixation of the foam structure 10 with the vibrator assembly 30 and the metal dome 20. The metal dome 20 is then connected to the housing 40 to achieve relative fixation with the housing 40. Furthermore, based on this connection, the assembly consistency of the foam structure 10 in the linear vibration motor 100 is ensured, thereby ensuring the performance consistency of the linear vibration motor 100.

[0043] In one embodiment of the present invention, there are multiple through-slots 14, which are spaced apart along the first direction on the third side surface 12. This allows each of the vibrating arms 23 in the metal dome 20 to correspond to a through-slot 14, thereby increasing the width of the foam structure 10 and the connection strength between the metal dome 20 and the foam structure 10, thereby enhancing the damping effect of the foam structure 10.

[0044] In a specific embodiment of the present utility model, the depth \(l\) of the through groove 14 and the length \(L\) of the foam body satisfy: \(0.5L\leq l\leq0.8L\). Specifically, the depth \(l\) of the through groove 14 is \(l = 0.5L\), \(l = 0.6L\), \(l = 0.7L\), or \(l = 0.8L\). By setting the above parameter relationship, the contact area between the foam body and the vibration arm 23 can be increased, so that the connection strength between the foam body and the vibration arm 23 can be increased, thereby improving the service life of the linear vibration motor 100.

[0045] In a specific embodiment of the present utility model, the foam main body is arranged in a cuboid shape. This can facilitate the processing of the foam body. Of course, in other embodiments, the foam structure 10 can also be other polyhedron structures, which can be specifically set according to needs.

[0046] In a specific embodiment of the present utility model, the through groove 14 is a laser cutting formed structure. This can facilitate the processing and forming of the through groove 14, thereby improving the processing efficiency of the foam structure 10.

[0047] The second aspect of the present utility model provides a linear vibration motor 100, which includes a housing 40, a vibrator assembly 30, a stator assembly, a metal shrapnel 20, and the foam structure 10 described in any one of the above, which are accommodated in the housing 40. The metal shrapnel 20 is arranged in pairs and suspends the vibrator assembly 30 in the housing 40. The foam body is clamped to the metal shrapnel 20 through the through groove 14, and the first side surface 11 is connected to the vibrator assembly 30. The bottom of the through groove 14 abuts against the side edge of the metal shrapnel 20 in the non-vibration direction.

[0048] Specifically, the housing 40 includes an upper shell forming an open cavity and a lower shell covering the opening of the open cavity. The upper shell and the lower shell are adapted to form a receiving cavity. The stator assembly includes a circuit board and a coil electrically connected to the circuit board. The circuit board and the coil are both connected to the lower shell. The vibrator assembly 30 is arranged above the stator assembly and specifically includes at least a mass block and a magnet connected together.

[0049] The number of the metal shrapnel 20 is two. Along the long axis direction of the housing 40, the two metal shrapnel 20 are respectively arranged on both sides of the vibrator assembly 30, and one end of each metal shrapnel 20 is connected to the inner wall of the housing 40, and the other end is connected to the vibrator assembly 30. In this way, the vibrator assembly 30 is suspended above the stator assembly, so that the vibrator assembly 30 can reciprocally vibrate along the long axis direction of the housing 40 under the drive of the stator assembly.

[0050] The number of the foam structures 10 is two, and the specific structure refers to the above-mentioned embodiment. The two foam structures 10 are respectively clamped on the vibrating arms 23 of the two metal elastic sheets 20 through the through grooves 14. The first side surface 11 of the foam body is connected to the side surface of the oscillator assembly 30, and the second side surface abuts against the inner surface of the metal elastic sheet 20 or the housing 40, and is used to provide vibration damping for the oscillator assembly 30.

[0051] In a specific embodiment of the present utility model, the first side surface 11 is adhesively fixed to the oscillator assembly 30. Specifically, glue is applied to the mass block of the oscillator assembly 30, and the first side surface 11 of the foam body is pasted to the mass block, so as to realize the fixed connection between the foam structure 10 and the oscillator assembly 30.

[0052] In a specific embodiment of the present utility model, the metal elastic sheet 20 includes a first connecting portion 21, a second connecting portion 22, and a vibrating arm 23 connected between the first connecting portion 21 and the second connecting portion 22. The vibrating arm 23 includes two elastic arms arranged in a U shape or a V shape; the foam body is provided with one through groove 14, the first side surface 11 of the foam body is connected to the oscillator assembly 30, and the through groove 14 is clamped on the elastic arm close to the oscillator assembly 30. In this way, the first side surface 11 of the foam is connected to the mass block of the oscillator assembly 30, and the second side surface is adapted to the elastic arm of the metal elastic sheet 20, that is, the foam structure 10 acts between the elastic arms of the metal elastic sheet 20, between the metal elastic sheet 20 and the mass block.

[0053] In a specific embodiment of the present utility model, the metal elastic sheet 20 includes a first connecting portion 21, a second connecting portion 22, and a vibrating arm 23 connected between the first connecting portion 21 and the second connecting portion 22. The vibrating arm 23 includes two elastic arms arranged in a U shape or a V shape; the foam body is provided with two through grooves 14, the first side surface 11 of the foam body is connected to the oscillator assembly 30, and the second side surface is connected to the housing 40. 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 to the mass block of the oscillator assembly 30, and the second side surface is adapted to the inner wall surface of the housing 40, that is, the foam structure 10 acts between the elastic arms of the metal elastic sheet 20, between the metal elastic sheet 20 and the mass block, and between the metal elastic sheet 20 and the housing 40.

[0054] The third aspect of the present utility model further provides an electronic device, including the linear vibration motor 100 described in any one of the above.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; 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 invention.

Claims

1. A foam structure, which is used for a linear vibration motor, is characterized in that, The linear vibration motor includes a housing and an oscillator assembly that is suspended in the housing by a metal shrapnel and can vibrate in the vibration direction; the foam structure includes a foam body, the foam body includes a first side surface and a second side surface that are oppositely arranged in a first direction, and a third side surface and a fourth side surface that are arranged in a second direction, the first direction is perpendicular to the second direction, a through groove is arranged on the third side surface along the second direction, and the width of the through groove gradually increases along the second direction; Wherein, the foam structure is connected to the oscillator assembly through the first side surface and is clamped to the vibration arm of the metal shrapnel through the through groove.

2. The foam structure according to claim 1, wherein The number of the through grooves is multiple, and the multiple through grooves are arranged at intervals on the third side surface in the first direction.

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

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

5. The foam structure according to claim 1, characterized in that, The through groove is a laser cutting formed structure.

6. A linear vibration motor, characterized in that, It includes a housing and an oscillator assembly, a stator assembly, a metal shrapnel and the foam structure according to any one of claims 1-5 accommodated in the housing. The metal shrapnels are arranged in pairs and support and suspend the oscillator assembly in the housing. The foam body is clamped to the metal shrapnel through the through groove, and the first side surface is connected to the oscillator assembly. The bottom of the through groove abuts against the side edge of the metal shrapnel in the non-vibration direction.

7. The linear vibration motor according to claim 6, characterized in that, The first side surface is fixedly glued to the oscillator assembly.

8. The linear vibration motor according to claim 6, characterized in that, The metal shrapnel includes 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 includes two elastic arms arranged in a U shape or a V shape; One through groove is arranged on the foam body. The first side surface of the foam body is connected to the oscillator assembly, and the through groove is clamped to the elastic arm close to the oscillator assembly.

9. The linear vibration motor according to claim 6, wherein The metal shrapnel includes 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 includes two elastic arms arranged in a U shape or a V shape; Two through grooves are arranged on the foam body. The first side surface of the foam body is connected to the oscillator assembly, and the second side surface is connected to the housing. The two through grooves are respectively clamped to the two elastic arms.

10. An electronic device, characterized in that, It includes the linear vibration motor according to any one of claims 6-9.

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