Foam structure and linear vibration motor

Abstract

The present invention relates to the technical field of vibration motors, and specifically relates to a foam structure and a linear vibration motor. The foam structure provided by the present invention comprises a foam body; the foam body comprises a first side surface and a second side surface which are arranged opposite to each other in a width direction of the foam body, and slits penetrating the first side surface and the second side surface; in a height direction of the foam body, one end of each slit extends to the end surface of the foam body, and the other end is located in the middle of the foam body; and the foam body is configured to be fitted with vibration arms of metal elastic pieces of the linear vibration motor by means of the slits. By providing the structure, the connection between the foam structure and the metal elastic pieces can be realized by means of the slits of the foam structure, that is, positioning can be realized by using the foam structure, thereby improving the mounting consistency of the foam structure, and thus ensuring the performance consistency of the linear vibration motor.

Description

Foam structure and linear vibration motor TECHNICAL FIELD

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

[0002] Linear vibration motors are widely used in mobile phones, tablets and other consumer electronic products due to their small size, and use vibration instead of sound. A linear vibration motor generally includes a shell, a vibrator assembly and a stator assembly received in the shell. The vibrator assembly is supported in the shell by a metal spring and can reciprocate under the drive of the stator assembly. In related technologies, 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 making a sound.

[0003] The spring structure of the conventional design has no damping member assembly positioning structure, which causes inconsistent positions of the damping member in the assembled linear vibration motor, resulting in inconsistent performance of the linear vibration motor.

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

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

[0006] The present application provides the following scheme in a first aspect: a foam structure for a linear vibration motor, comprising a foam body, the foam body comprising a first side surface and a second side surface arranged opposite along a width direction thereof, and a slit penetrating through the first side surface and the second side surface, along a height direction of the foam body, one end of the slit extending to an end surface of the foam body, and the other end being located at a middle part of the foam body.

[0007] The foam body is adapted to be clamped on a metal spring of the linear vibration motor through the slit.

[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, along the height direction of the foam body, a guide portion is formed at the slit of the end surface of the foam body, and the guide portion is adapted to guide a vibration arm of the metal spring to the slit.

[0010] In one specific embodiment of the present application, the guide opening is a V-shaped notch.

[0011] In one specific embodiment of the present application, the number of slits is multiple, and the multiple slits are arranged at intervals.

[0012] In one specific embodiment of the present application, the foam body is cuboid.

[0013] In one specific embodiment of the present application, the two sides of the slit are attached; and / or

[0014] The length l of the slit and the height L of the foam body satisfy: 0.5L≤l≤0.8L.

[0015] 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 contained in the shell, the metal spring is arranged in pairs, and the pair of metal springs supports the vibrator assembly suspended in the shell, and the foam body is clamped on the metal spring through the slit.

[0016] In one specific embodiment of the present application, the foam body and the metal spring are fixedly connected by glue, and the glue point is located on the side where the foam body and the metal spring are connected.

[0017] In one specific embodiment of the present application, the metal spring comprises a first connecting part for connecting with the shell, a second connecting part for connecting with the vibrator assembly, and a vibration arm connected between the first connecting part and the second connecting part, the vibration arm is arranged in a straight line, or the vibration arm comprises two spring arms connected in a V shape or a U shape, one end of one spring arm is connected with the first connecting part, and the other end of the other spring arm is connected with the second connecting part.

[0018] In one specific embodiment of the present application, when the vibration arm comprises two spring arms and the number of slits is one, the slit is clamped on the spring arm connected with the first connecting part; when the vibration arm comprises two spring arms and the number of slits is two, the two slits are clamped on the two spring arms respectively; when the vibration arm is arranged in a straight line and the number of slits is one, the slit is clamped on the vibration arm.

[0019] The foam structure provided by the application can be clamped on the vibration arm of the metal spring when linear vibration motor is assembled, so that the connection between the metal spring and the foam structure is realized, and the positioning of the foam structure in the non-vibration direction is realized by using the metal spring, and then the foam structure is installed into the shell of the linear vibration motor by the metal spring, so that the assembly consistency of the foam structure is ensured, and the performance consistency of the linear vibration motor is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Fig. 1 is a schematic view of the foam structure in the embodiment of the present application;

[0022] Fig. 2 is a front view of Fig. 1;

[0023] Fig. 3 is a front view of the foam structure in another embodiment of the present application;

[0024] Fig. 4 is a schematic view of one assembly structure of the foam structure and the metal spring;

[0025] Fig. 5 is a schematic view of another assembly structure of the foam structure and the metal spring;

[0026] Fig. 6 is a schematic view of another assembly structure of the foam structure and the metal spring.

[0027] Explanation of reference signs: 10-foam structure, 11-first side, 12-third side, 13-fifth side, 14-slit, 15-guide part; 20-metal spring, 21-first connecting part, 22-second connecting part, 23-vibration arm. DETAILED DESCRIPTION

[0028] Exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings. Although exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be accurately conveyed to those skilled in the art.

[0029] 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 "has" are inclusive and therefore specify the presence of 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 groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.

[0030] 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.

[0031] Spatially relative terms, such as "inner", "outer", "inward", "outward", "lower", "bottom", "top", "upper", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Such spatially relative terms can encompass different orientations of the device in use or operation, depending on the particular context in which it is used. For example, if the device is turned over, the element or feature described as "below" or "beneath" another element or feature would be oriented "above" or "over" 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.

[0032] The present application provides a foam structure 10 which can be used in a linear vibration motor to solve the problem of inconsistent foam position after assembly affecting the performance of the linear vibration motor product in the related art.

[0033] Referring to FIGS. 1-6, the present application provides a foam structure 10 including a foam body, the foam body including a first side 11 and a second side oppositely arranged along a width direction of the foam body, a slit 14 penetrating the first side 11 and the second side, and an end of the slit 14 extending to an end surface of the foam body and the other end of the slit 14 located in a middle portion of the foam body along a height direction of the foam body, wherein the foam body is adapted to be clamped on a vibrating arm 23 of a metal spring 20 of a linear vibration motor through the slit 14.

[0034] Specifically, the foam body is a one-piece structure and specifically includes the first side 11 and the second side oppositely arranged along a width direction of the foam body, a third side 12 and a fourth side arranged along a height direction of the foam body, and a fifth side 13 and a sixth side arranged along a length direction of the foam body. The slit 14 penetrates the first side 11 and the second side, and one end of the slit 14 extends to the third side 12 and the other end of the slit 14 extends to the middle portion of the foam body in the direction of the fourth side.

[0035] During assembly, the vibrating arm 23 of the metal spring 20 is aligned with the slit 14 of the foam structure 10 and inserted into the slit 14 until the side edge of the vibrating arm 23 abuts against the bottom of the slit 14, so that not only the connection between the metal spring 20 and the foam structure 10 is achieved, but also the positioning of the foam structure 10 in the non-vibration direction is achieved by using the metal spring 20. Then, the metal spring 20 is installed into the linear vibration motor according to a predetermined procedure, one of the fifth side 13 or the sixth side of the foam body is used to abut against the inner wall surface of the housing, and the other of the fifth side 13 or the sixth side of the foam body is used to abut against the metal spring 20 or the vibrator assembly. Due to the connection between the foam structure 10 and the metal spring 20, the positioning is achieved by using the structure itself, thereby improving the assembly consistency of the foam structure 10 and ensuring the performance consistency of the linear vibration motor.

[0036] The foam structure 10 provided by the present application is provided with the slit 14 penetrating the first side 11 and the second side oppositely arranged along the width direction of the foam body, and one end of the slit 14 extending to the end surface of the foam body and the other end of the slit 14 located in the middle portion of the foam body along the height direction. When the linear vibration motor is assembled, the foam structure 10 is clamped on the vibrating arm 23 of the metal spring 20, so that not only the connection between the metal spring 20 and the foam structure 10 is achieved, but also the positioning of the foam structure 10 in the non-vibration direction is achieved by using the metal spring 20. Then, the foam structure 10 is installed into the housing of the linear vibration motor through the metal spring 20, so that the assembly consistency of the foam structure 10 is ensured and the performance consistency of the linear vibration motor is ensured.

[0037] In one specific embodiment of the present application, a guide portion 15 is formed at the end surface of the foam body along the height direction of the foam body, and the guide portion 15 is adapted to guide the vibration arm 23 to the slit 14. By providing the guide portion 15, the vibration arm 23 can be guided by the guide portion 15, thereby improving the assembly efficiency of the foam structure 10 and the metal spring 20, and further improving the assembly efficiency of the linear vibration motor.

[0038] In one specific embodiment of the present application, the guide opening is a V-shaped notch.

[0039] Specifically, the V-shaped notch is provided on the third side surface 12, and the cross section of the V-shaped notch is V-shaped, and the two ends extend to the first side surface 11 and the second side surface along the width direction of the foam body, respectively, and the slit 14 is located at the tip of the V-shaped notch, so that the vibration arm 23 of the metal spring 20 can slide along the inclined surface of the V-shaped notch to the slit 14, and the assembly of the foam structure 10 and the metal spring 20 is realized. At the same time, the V-shaped notch formed by the inward recess of the foam body can also simplify the foam structure 10 and facilitate processing.

[0040] Of course, in other embodiments, the guide opening can also be formed by other guide blocks protruding from the third side surface 12.

[0041] In one specific embodiment of the present application, the number of slits 14 is multiple, and the multiple slits 14 are arranged at intervals.

[0042] Specifically, the number of slits 14 can be set according to the shape of the vibration arm 23 in the metal spring 20, for example, when the vibration arm 23 is in the form of a straight line, the number of slits 14 is one, when the vibration arm 23 is in the form of V or U, the number of slits 14 can be one and specifically clamped on one of the spring arms of the vibration arm 23, or the number of slits 14 can be two, and the two slits 14 are clamped on two different spring arms.

[0043] By providing multiple slits 14, different shapes of metal springs 20 can be adapted, thereby improving the adaptability.

[0044] In one specific embodiment of the present application, the foam body is in the form of a rectangular parallelepiped. Thus, the processing of the foam body can be facilitated. Of course, in other embodiments, the foam structure 10 can also be other polyhedral structures, which can be set as needed.

[0045] In one specific embodiment of the present application, the two side surfaces of the slit 14 are arranged in close contact. Specifically, the slit 14 is processed and formed by a die cutter, so that the two side surfaces of the slit 14 are arranged in close contact, so that when the foam structure 10 is clamped to the vibration arm 23 of the metal spring 20 through the slit 14, the foam body and the vibration arm 23 of the metal spring 20 are in interference fit.

[0046] In one specific embodiment of the present application, the length l of the slit 14 and the height L of the foam body satisfy: 0.5L≤l≤0.8L. Specifically, the length l of the slit 14 is 0.5L, 0.6L, 0.7L or 0.8L. By setting the above parameter relationship, the connection strength of the foam body and the vibration arm 23 can be ensured, thereby improving the service life of the linear vibration motor.

[0047] The second aspect of the present application also provides a linear vibration motor, which comprises a housing and a vibrator assembly, a stator assembly, a metal spring 20 and the foam structure 10 in any of the above embodiments received in the housing. The metal spring 20 is arranged in pairs, and the pair of metal springs 20 supports the vibrator assembly suspended in the housing, and the foam body is clamped on the metal spring 20 through the slit 14.

[0048] Specifically, the housing comprises 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.

[0049] The stator assembly comprises a circuit board and a coil electrically connected to the circuit board. The circuit board and the coil are connected to the lower shell.

[0050] The vibrator assembly is arranged above the stator assembly and specifically comprises at least a mass block and a magnetic steel connected as one body. The number of metal springs 20 is two, and the two metal springs 20 are arranged on both sides of the vibrator assembly along the long axis of the housing. One end of each metal spring 20 is connected to the inner wall of the housing, and the other end is connected to the vibrator assembly. In this way, the vibrator assembly is suspended above the stator assembly, so that the vibrator assembly can reciprocate along the long axis of the housing under the drive of the stator assembly.

[0051] The number of foam structures 10 is two, and the specific structure is referred to the above embodiments. The two foam structures 10 are clamped on the two metal springs 20 respectively. One of the fifth side surface 13 or the sixth side surface of the foam body is used to abut with the inner wall surface of the housing, and the other of the fifth side surface 13 or the sixth side surface of the foam body is used to abut with the metal spring 20 or the vibrator assembly and to provide vibration damping for the vibrator assembly.

[0052] In one specific embodiment of the present application, the foam body and the metal spring 20 are fixedly connected by gluing, and the gluing point is located on the side surface where the foam body and the metal spring 20 are connected. Specifically, the structure stability of the foam body and the metal spring 20 can be further improved by gluing. Specifically, the gluing point is located on the first side surface 11 or the second side surface, and specifically along the slit 14.

[0053] In one specific embodiment of the present application, the metal spring 20 comprises a first connecting portion 21 for connecting with the shell, a second connecting portion 22 for connecting with the vibrator assembly, and a vibration arm 23 connected between the first connecting portion 21 and the second connecting portion 22, the vibration arm 23 is arranged in a linear shape, or the vibration arm 23 comprises two spring arms connected in a V shape or a U shape, one end of one spring arm is connected with the first connecting portion 21, and the other end of the other spring arm is connected with the second connecting portion 22.

[0054] In one embodiment, the vibration arm 23 is arranged in a linear shape, the first connecting portion 21 and the second connecting portion 22 are arranged in a plate shape and are arranged in parallel at both ends of the vibration arm 23, wherein the first connecting portion 21 and the second connecting portion 22 are arranged at both ends of the vibrator assembly along the short axis direction, and the first connecting portion 21 is connected with the inner wall of the shell, and the second connecting portion 22 is connected with the vibrator assembly. At this time, the number of slits of the foam structure 10 is one, and the slit 14 is clamped on the vibration arm 23.

[0055] In one embodiment, the vibration arm 23 is arranged in a V shape, and the first connecting portion 21 and the second connecting portion 22 are arranged at the opening of the V shape, wherein the first connecting portion 21 is connected with the inner end face of the long axis end of the shell, and the second connecting portion 22 is connected with the end face of the long axis end of the vibrator assembly. At this time, if the number of slits 14 is one, the slit 14 is clamped on the spring arm connected with the first connecting portion 21; if the number of slits 14 is two, the two slits 14 are clamped on the two spring arms respectively.

[0056] In one embodiment, the vibration arm 23 is arranged in a V shape, and the first connecting portion 21 and the second connecting portion 22 are arranged in parallel, and the first connecting portion 21 and the second connecting portion 22 are connected with the inner wall of the shell and the vibrator assembly respectively on the same side in the short axis direction. At this time, if the number of slits 14 is one, the slit 14 is clamped on the spring arm connected with the first connecting portion 21; if the number of slits 14 is two, the two slits 14 are clamped on the two spring arms respectively.

[0057] The third aspect of the present application also provides an electronic device comprising the linear vibration motor of any one of the above embodiments. The structure of the linear vibration motor refers to the above embodiments. Since the electronic device has the linear vibration motor in all the above embodiments, it also inevitably has all the beneficial effects of the linear vibration motor.

[0058] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part 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 application.

Claims

1. A foam structure for a linear vibration motor, characterized by, The foam body includes a first side surface and a second side surface arranged opposite to each other along a width direction of the foam body, and a slit extending through the first side surface and the second side surface, wherein one end of the slit extends to an end surface of the foam body along a height direction of the foam body, and the other end is located in a middle part of the foam body. The foam body is adapted to be clamped on the metal spring of the linear vibration motor through the slit.

2. The foam structure of claim 1, wherein, A guide portion is formed at the slit of the end surface of the foam body along the height direction of the foam body, and the guide portion is adapted to guide a vibration arm of the metal spring to the slit.

3. The foam structure of claim 2, wherein, The guide opening is a V-shaped notch.

4. The foam structure of claim 1, wherein, The number of the slits is multiple, and the multiple slits are arranged at intervals.

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

6. The foam structure of claim 1 wherein, The two side surfaces of the slit are arranged in abutment; and / or The length l of the slit and the height L of the foam body satisfy: 0.5L≤l≤0.8L.

7. A linear vibration motor characterized by The shell, the vibrator assembly, the stator assembly, the metal spring, and the foam structure according to any one of claims 1-6 are arranged in the shell, the metal spring is arranged in pairs, and the pair of metal springs supports and suspends the vibrator assembly in the shell, and the foam body is clamped on the metal spring through the slit.

8. The linear vibration motor of claim 7, wherein, The foam body and the metal spring are fixedly connected by glue, and the glue point is located on the side surface where the foam body and the metal spring are connected.

9. The linear vibration motor of claim 7, wherein, The metal spring includes a first connecting portion for connecting with the shell, a second connecting portion for connecting with the vibrator assembly, and a vibration arm connected between the first connecting portion and the second connecting portion, the vibration arm is arranged in a linear shape, or the vibration arm includes two spring arms connected in a V shape or a U shape, one end of one spring arm is connected with the first connecting portion, and the other end of the other spring arm is connected with the second connecting portion.

10. The linear vibration motor of claim 9, wherein, When the vibration arm includes two spring arms and the number of the slit is one, the slit is clamped on the spring arm connected with the first connecting portion; when the vibration arm includes two spring arms and the number of the slit is two, the two slits are respectively clamped on the two spring arms; and when the vibration arm is arranged in a linear shape and the number of the slit is one, the slit is clamped on the vibration arm.

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