Headphone and its assembly method

Abstract

The present invention application provides a headset, which relates to the technical field of headsets. The headset includes a housing, a circuit board, and a charging component. The housing has an outer surface, and a limiting hole penetrating through the outer surface is formed on the housing. The circuit board is arranged inside the housing. The charging component is electrically connected to the circuit board and has a contact surface for abutting against an external charging device. The limiting hole cooperates with the charging component to define the installation position of the charging component, and the contact surface and the outer surface are smoothly butted. Through the limiting effect of the limiting hole, it can ensure that the contact surface is smoothly butted with the outer surface of the housing at a determined installation position. On the one hand, the integrity of the outer surface of the headset is improved. On the other hand, it can prevent dust from accumulating on the outer surface, ensure that the contact surface can form good contact with the charging terminals of the external charging device, ensure that the contact surface remains in contact with the charging terminals, so that the charging component has good electrical conductivity, and improve the charging stability of the headset.

Description

Technical Field

[0001] The present invention relates to the technical field of earphones, and particularly to an earphone and an assembling method thereof. Background Art

[0002] With the rapid development of technology, electronic devices such as smart phones and tablet computers have emerged one after another and are widely used in many fields. The above-mentioned electronic devices have made the importance of supporting products such as earphones increasingly prominent. To improve the convenience of using earphones and get rid of the interference of traditional earphone connecting wires during use and storage, Bluetooth earphones developed based on Bluetooth chip technology have emerged one after another. For traditional Bluetooth earphones, a copper column passing through the housing of the Bluetooth earphone is usually abutted against an external charging device to charge the Bluetooth earphone. However, after the installation of the copper column, various stains will accumulate at the dead corner position of the end of the copper column, thus affecting the charging stability of the entire earphone. Summary of the Invention

[0003] One technical problem solved by the present invention is how to ensure the charging stability of the earphone.

[0004] An earphone, comprising:

[0005] A housing having an outer surface, and a limiting hole penetrating through the outer surface is formed on the housing; a circuit board disposed inside the housing, and

[0006] A charging component electrically connected to the circuit board and having a contact surface for abutting against an external charging device, the limiting hole cooperating with the charging component to define the installation position of the charging component, and the contact surface and the outer surface being smoothly butted.

[0007] In one embodiment, the charging component includes a first elastic sheet and a second elastic sheet, the first elastic sheet is inserted into the limiting hole, the second elastic sheet is fixed on the circuit board, and the first elastic sheet and the second elastic sheet are abutted against each other.

[0008] In one embodiment, the housing has an inner surface opposite to the outer surface, the limiting hole includes a stepped hole and a first through hole communicating with each other, the stepped hole is recessed from the outer surface, and the first through hole is recessed from the bottom wall surface of the stepped hole and penetrates through the inner surface;

[0009] The first elastic sheet includes a contact piece and a first connecting piece, the contact surface is disposed on the contact piece, one end of the first connecting piece is fixed on the surface of the contact piece opposite to the contact surface, the contact piece cooperates with the stepped hole, and the first connecting piece is inserted into the first through hole and abuts against the second elastic sheet.

[0010] In one embodiment, the housing includes a boss that is connected to and protrudes relative to the inner surface. The first connecting piece includes a first connecting section and a second connecting section. One end of the first connecting section is fixed to the contact piece, the second connecting section is bent and connected to the other end of the first connecting section, and the second connecting section abuts between the boss and the second elastic piece.

[0011] In one embodiment, the limiting hole further includes a second through hole spaced apart from the first through hole. The second through hole is formed by recessing from the bottom wall surface of the stepped hole and penetrates the inner surface. The first elastic piece further includes a second connecting piece spaced apart from the first connecting piece. The second connecting piece is fixed to the surface of the contact piece opposite to the contact surface, and a part of the second connecting piece adheres to the inner surface and abuts against the housing.

[0012] In one embodiment, the second elastic piece includes a fixing piece and an abutting piece. The abutting piece is connected to the fixing piece at an angle. The fixing piece is fixedly arranged on the circuit board. The abutting piece is elastically connected to the fixing piece and abuts against the first elastic piece.

[0013] In one embodiment, the first elastic piece has a first abutting surface facing the second elastic piece, and the second elastic piece has a second abutting surface facing the first elastic piece. The first abutting surface and the second abutting surface abut against each other. The first abutting surface is a plane, the second abutting surface is an arc-shaped curved surface, and the area of the first abutting surface is larger than the area of the second abutting surface.

[0014] In one embodiment, it further includes an adhesive layer located in the limiting hole. The adhesive layer is connected between the housing and the charging assembly, and the adhesive layer is used to seal the gap between the housing and the charging assembly.

[0015] In one embodiment, the contact surface is a curved surface or a plane.

[0016] An assembling method includes the following steps:

[0017] Thread the first elastic piece through the limiting hole of the housing;

[0018] Fix the second elastic piece on the circuit board;

[0019] Place the circuit board with the second elastic piece fixed therein into the housing, and bend the first connecting piece on the first elastic piece so that the first elastic piece abuts between the housing and the second elastic piece; and

[0020] Pour glue into the limiting hole so that the glue solidifies into an adhesive layer sealed in the gap between the housing and the first elastic piece.

[0021] A technical effect of an embodiment of the present invention is that through the limiting function of the limiting hole, the charging component can be effectively prevented from rotating relative to the limiting hole and changing its installation position, so that the installation position of the charging component on the housing is determined. Subsequently, the installation position of the contact surface is determined. Finally, it is ensured that the contact surface smoothly docks with the appearance surface of the housing at the determined installation position, that is, the tangent planes of the contact surface and the appearance surface coincide at the docking position and maintain a mutually "flush" relationship. Given that the outer surface of the earphone includes the contact surface of the charging component and the appearance surface of the housing, on the one hand, it can prevent the outer surface of the earphone from having uneven structures, ensure that the outer surface of the earphone forms an integrated visual experience, and improve the integrity of the outer surface of the earphone. On the other hand, it can prevent dust from accumulating at the uneven structures, ensure that the contact surface can form good contact with the charging terminals of external charging devices, ensure that the contact surface remains in contact with the charging terminals, so that the charging component has good electrical conductivity, and improve the charging stability of the earphone. Description of the Drawings

[0022] Figure 1 Schematic perspective view of an earphone provided for an embodiment;

[0023] Figure 2 For Figure 1 Exploded structural view of the earphone shown;

[0024] Figure 3 For Figure 2 Enlarged structural view of part A in

[0025] Figure 4 For Figure 1 Schematic perspective sectional view of the earphone shown;

[0026] Figure 5 For Figure 1 Partial structural view of the earphone shown including the housing and the first elastic piece;

[0027] Figure 6 For Figure 1 Partial structural view of the housing of the earphone shown;

[0028] Figure 7 For Figure 6 Planar structural view of

[0029] Figure 8 For Figure 1 Schematic perspective view of the first elastic piece in the earphone shown;

[0030] Figure 9 For Figure 1Schematic diagram of the three-dimensional structure of the second elastic piece in the earphone shown;

[0031] Figure 10 It is a flowchart of an assembly method provided for an embodiment. Detailed implementation manners

[0032] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present invention can be understood more thoroughly and comprehensively.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a middle element at the same time. The terms "inner", "outer", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments.

[0034] Meanwhile, refer to Figure 1 、 Figure 2 and Figure 3 . An earphone 10 provided by an embodiment of the present invention is a rechargeable Bluetooth earphone. The earphone 10 includes a housing 100, a circuit board 200, and a charging component 300. The circuit board 200 is disposed in the housing 100. The charging component 300 penetrates through the housing 100 and is electrically connected to the circuit board 200. When the charging component 300 abuts against the charging terminal in an external charging device such as a charging case, the charging case can charge the battery in the earphone 10 through the charging component 300 and the circuit board 200 so that the battery can supplement energy for recycling.

[0035] Meanwhile, refer to Figure 2 、 Figure 5 and Figure 6, in some embodiments, the housing 100 has an outer surface 110 and an inner surface 120. The outer surface 110 of the housing 100 is in direct contact with the outside world, and the inner surface 120 of the housing 100 is used to define the boundary of the inner cavity of the housing 100. Obviously, the orientations of the outer surface 110 and the inner surface 120 are opposite to each other. A limiting hole 130 is formed in the housing 100. The limiting hole 130 is a through hole that penetrates both the outer surface 110 and the inner surface 120 of the housing 100 at the same time. The number of the limiting holes 130 is two. Obviously, the number of the charging components 300 is also two. One charging component 300 is inserted into each limiting hole 130. When one of the charging components 300 abuts against the positive charging terminal in the charging case, and the other charging component 300 abuts against the negative charging terminal in the charging case, the charging case can charge the earphone 10 through the two charging components 300.

[0036] Refer also to Figure 2 , Figure 5 and Figure 7 , in some embodiments, the limiting hole 130 includes a first through hole 131, a second through hole 132 and a stepped hole 133, and the housing 100 includes a boss 140. The cross-sectional dimensions of both the first through hole 131 and the second through hole 132 are smaller than the cross-sectional dimension of the stepped hole 133. The boss 140 is located in the inner cavity of the housing 100. The boss 140 is connected to the inner surface 120 of the housing 100 and protrudes from the inner surface 120 by a certain height. The shape of the boss 140 can be generally rectangular. The first through hole 131 and the second through hole 132 are spaced apart from each other, so that the first through hole 131 and the second through hole 132 are located on opposite sides of the boss 140. The stepped hole 133 is formed by a part of the outer surface 110 of the housing 100 recessing inward by a set depth towards the inner surface 120. The stepped hole 133 can be generally a curved runway-shaped hole. Of course, the stepped hole 133 can also be an oval hole or other regular polygon holes, etc. The first through hole 131 is generally a rectangular hole. Of course, the first through hole 131 can also be an oval hole or other regular polygon holes, etc. The second through hole 132 is also generally a rectangular hole. Of course, the second through hole 132 can also be an oval hole or other regular polygon holes, etc.

[0037] The first through hole 131 is formed by a part of the bottom wall surface 133a of the stepped hole 133 recessing, and the first through hole 131 penetrates the inner surface 120 of the housing 100, so that the first through hole 131 communicates with both the stepped hole 133 and the inner cavity of the housing 100 at the same time. Similarly, the second through hole 132 is formed by another part of the bottom wall surface 133a of the stepped hole 133 recessing, and the second through hole 132 penetrates the inner surface 120 of the housing 100, so that the second through hole 132 communicates with both the stepped hole 133 and the inner cavity of the housing 100 at the same time.

[0038] Refer also to Figure 1 、 Figure 3 and Figure 8 In some embodiments, the first elastic piece 301 includes a first connecting piece 310, a second connecting piece 320, and a contact piece 330. The contact piece 330 is adapted to the shape of the stepped hole 133, so that the contact piece 330 can be adapted to the stepped hole 133. The contact piece 330 has a contact surface 331 and a mounting surface 332. The contact surface 331 is in direct contact with the outside. The orientations of the contact surface 331 and the mounting surface 332 are exactly opposite. The contact surface 331 can be a flat surface or a curved surface. When the contact piece 330 is engaged with the stepped hole 133, the contact surface 331 and the outer surface 110 of the housing 100 are smoothly butted. For example, the tangent planes of the contact surface 331 and the outer surface 110 at the butting portion coincide with each other. Generally speaking, the contact surface 331 and the outer surface 110 are "flush" with each other. In fact, the outer surface of the entire earphone 10 includes the contact surface 331 of the contact piece 330 and the outer surface 110 of the housing 100. When the contact surface 331 and the outer surface 110 are smoothly butted, the uneven structure on the outer surface of the entire earphone 10 can be eliminated, so that the outer surface of the entire earphone 10 is smoothly transitioned everywhere, avoiding defects such as pits or protrusions on the outer surface of the earphone 10 due to the inability of the contact surface 331 and the outer surface 110 to be "flush", ensuring that the outer surface of the earphone 10 forms a seamless visual experience, that is, well ensuring the integrity of the outer surface of the earphone 10. Effectively prevent dust from accumulating at the above pits or protrusions, and avoid poor contact between the charging component 300 and the charging terminal due to dust coverage, thereby improving the charging stability of the entire earphone 10.

[0039] Refer also to Figure 4 、 Figure 5 and Figure 8, the first connecting piece 310 includes a first connecting section 311 and a second connecting section 312. One end of the first connecting section 311 is connected to the mounting surface 332 of the contact piece 330, and the other end of the first connecting section 311 is bent and connected to the second connecting section 312, so that the first connecting section 311 and the second connecting section 312 are connected at an angle. For example, the first connecting section 311 and the second connecting section 312 can be perpendicular to each other. The first connecting section 311 is inserted into the first through hole 131. The second connecting section 312 abuts between the second elastic piece 302 and the boss 140. When the second elastic piece 302 applies a pressing force to the second connecting section 312, the second connecting section 312 can be clamped between the boss 140 and the second elastic piece 302. Obviously, through the abutting and limiting action of the boss 140 and the second connecting section 312, the installation stability of the entire first elastic piece 301 can be improved to a certain extent, and the entire first elastic piece 301 can be prevented from withdrawing from the limiting hole 130 under the action of the pressing force of the second elastic piece 302. In fact, the second connecting section 312 has two surfaces facing in opposite directions. One of the surfaces is denoted as the first abutting surface 312a, and the first abutting surface 312a faces the second elastic piece 302. The first abutting surface 312a is in direct contact with the second elastic piece 302 to form an abutting relationship, and the other surface is directly attached to the boss 140 to abut against the surface of the boss 140. At the same time, the first connecting section 311 can also be attached to the boss 140, so that the entire first connecting piece 310 forms a certain covering effect on the boss 140, further improving the installation stability of the first elastic piece 301.

[0040] The second connecting piece 320 is fixedly connected to the mounting surface 332 of the contact piece 330, so that the second connecting piece 320 and the first connecting piece 310 are located on the same side of the entire contact piece 330. At this time, the first connecting piece 310 and the second connecting piece 320 are spaced apart from each other. The second connecting piece 320 can be bent, so that a part of the second connecting piece 320 is inserted into the first through hole 131, and another part of the second connecting piece 320 is attached to the inner surface 120 of the housing 100. Through the abutting relationship between the second connecting piece 320 and the inner surface 120, the interference between the first elastic piece 301 and the housing 100 can be further increased, and the entire first elastic piece 301 can be prevented from withdrawing from the limiting hole 130 under the action of the pressing force of the second elastic piece 302, further improving the installation stability of the entire first elastic piece 301.

[0041] See also Figure 3 , Figure 4 and Figure 9, in some embodiments, the second elastic piece 302 includes a fixing piece 340 and an abutting piece 350. The fixing piece 340 is fixed on the current plate by means of patch welding. The abutting piece 350 is elastically connected to the fixing piece 340, and an included angle is formed between the abutting piece 350 and the fixing piece 340. The abutting piece 350 is used to abut against the second connecting section 312 of the first elastic piece 301. The abutting piece 350 has a second abutting surface 351, and the second abutting surface 351 can be an arc-shaped curved surface. The second abutting surface 351 faces the first elastic piece 301. For the first abutting surface 312a on the second connecting section 312, the first abutting surface 312a can be a plane, and the area of the first abutting surface 312a can be larger than the area of the second abutting surface 351. When the first elastic piece 301 and the second elastic piece 302 abut against each other, the first abutting surface 312a and the second abutting surface 351 are in contact with each other. Since the first abutting surface 312a is a plane and its area is larger than the second abutting surface 351 which is an arc-shaped curved surface, during the process of the first elastic piece 301 abutting against the second elastic piece 302, the arc-shaped curved second abutting surface 351 can slide smoothly relative to the planar first abutting surface 312a, reducing the frictional resistance between the two, so that the first elastic piece 301 and the second elastic piece 302 can accurately find the abutting position. At the same time, the area of the first abutting surface 312a is relatively large, which can provide sufficient space for the contact between the first abutting surface 312a and the second abutting surface 351, avoiding that the second abutting surface 351 cannot contact the first abutting surface 312a, ensuring a stable elastic force between the first elastic piece 301 and the second elastic piece 302, and finally improving the conductivity stability of the entire charging component 300.

[0042] If the charging component 300 uses a copper post, when the copper post is fitted with the round hole on the housing 100, generally, the end face of the copper post is not designed to be "flush" with the appearance surface 110. Even if the design scheme makes the end face of the copper post flush with the appearance surface 110 of the housing 100, however, during the welding process of the copper post and the circuit board 200, the copper post will rotate relative to the round hole, resulting in an installation error, thus changing the position of the end face of the copper post. Coupled with the fact that the appearance surface 110 of the housing 100 is usually a curved surface, the end face of the copper post after installation cannot be flush with the appearance surface 110.

[0043] Regarding the first elastic piece 301 in the above embodiments, when the first elastic piece 301 is inserted through the entire limiting hole 130 and cooperates with the limiting hole 130, since the contact piece 330 cooperates with the stepped hole 133, the first connecting piece 310 is inserted through the first through hole 131, and the second connecting piece 320 is inserted through the second through hole 132. Through the limiting effect of the limiting hole 130, the first elastic piece 301 can be effectively prevented from rotating relative to the limiting hole 130 and changing its installation position, so that the installation position of the first elastic piece relative to the limiting hole 130 is determined. Furthermore, the installation position of the contact surface 331 is determined, and finally, it is ensured that the contact piece 330 maintains a "flush" relationship with the outer surface 110 of the housing 100 at the determined installation position. On the one hand, it can prevent the appearance of uneven structures on the outer surface of the earphone 10, ensure a seamless visual experience on the outer surface of the earphone 10, and improve the integrity of the outer surface of the earphone 10. On the other hand, it can prevent dust from accumulating at the uneven structures, ensure that the contact surface 331 can form good contact with the charging terminal, ensure good electrical conductivity of the charging component 300 when the contact surface 331 contacts the charging terminal, and improve the charging stability of the earphone 10. In addition, the area of the contact surface 331 is relatively large, which can provide sufficient space for the abutment of the charging terminal to ensure that the charging terminal can always form an abutment relationship with the contact surface 331, and improve the electrical conductivity stability of the entire charging component 300.

[0044] In some embodiments, the earphone 10 further includes an adhesive layer located in the limiting hole 130. The adhesive layer is connected between the housing 100 and the charging component 300 and is used to seal the gap between the housing 100 and the charging component 300. Specifically, glue can be poured into the limiting hole 130. For example, the glue can flow into the stepped hole 133 to fill the gap between the contact piece 330 and the housing 100, the glue can also flow into the first through hole 131 to fill the gap between the first connecting piece 310 and the housing 100, and the glue can also flow into the second through hole 132 to fill the gap between the second connecting piece 320 and the housing 100. Therefore, when the glue solidifies to form the adhesive layer, on the one hand, the adhesive layer can provide a good sealing effect for the above gaps, prevent external liquid droplets and dust from entering the interior of the housing 100 through the above gaps, avoid the erosion of components such as the circuit board 200 of the housing 100 by the liquid droplets and dust, and improve the service life of the entire earphone 10. On the other hand, the adhesive layer can fix the first elastic piece 301 on the housing 100, improve the installation stability of the first elastic piece 301, prevent the first elastic piece 301 from shaking relative to the housing 100, ensure good contact between the first elastic piece 301, the second elastic piece 302 and the charging terminal, and ensure the electrical conductivity stability of the entire charging component 300.

[0045] By fixing the second elastic piece 302 on the circuit board 200 and making the first elastic piece 301 abut against the second elastic piece 302, an integrally formed connection structure between the first elastic piece 301 and the second elastic piece 302 is avoided. On the one hand, this can reduce the assembly difficulty of the charging component 300 and improve the assembly efficiency of the earphone 10. On the other hand, it can reduce the design and processing difficulty of the first elastic piece 301, and the second elastic piece 302 can directly use standard parts, which can reduce the manufacturing cost of the charging component 300 and the entire earphone 10 and improve the market competitiveness of the earphone 10.

[0046] Refer to Figure 2 , in some embodiments, the housing 100 includes a front shell 101 and a rear shell 102. The limiting hole 130 is provided on the front shell 101, and the front shell 101 and the rear shell 102 are fixed by a detachable connection method. For example, the front shell 101 and the rear shell 102 can be fixed by screw connection or snap connection, etc. Since the front shell 101 and the rear shell 102 are fixed by a detachable connection method, when the components inside the entire housing 100 need to be maintained due to failures, the front shell 101 and the rear shell 102 can be quickly disassembled.

[0047] Refer to Figure 10 , the present invention also provides an assembly method, which can assemble the above-mentioned earphone 10. The assembly method mainly includes the following steps:

[0048] S410, In the first step, insert the first elastic piece 301 into the limiting hole 130 of the housing 100. S420, In the second step, fix the second elastic piece 302 on the circuit board 200 by means of patch welding. The sequence of the first step and the second step can be exchanged. S430, In the third step, place the circuit board 200 with the second elastic piece 302 fixed therein into the inner cavity of the housing 100, and bend the first connecting piece 310 on the first elastic piece 301, so that the first connecting piece 310 includes a first connecting section 311 and a second connecting section 312 which are bent and connected, and make the first abutting surface 312a of the second connecting section 312 abut against the second abutting surface 351 of the second elastic piece 302. At this time, the second connecting section 312 is clamped between the boss 140 and the second elastic piece 302, and the boss 140 plays a good limiting role on the second connecting section 312, ensuring a reliable abutting relationship is formed between the second connecting section 312 and the second elastic piece 302, and improving the conductivity stability of the charging component 300. S440, In the fourth step, pour a certain amount of glue into the limiting hole 130 by means of dispensing. When the glue solidifies to form an adhesive layer, the adhesive layer will fill the gap between the first elastic piece 301 and the housing 100, thereby playing a good sealing role on the limiting hole 130, preventing external dust and liquid from entering the interior of the housing 100 through the limiting hole 130 to erode parts such as the circuit board 200, and at the same time, the first elastic piece 301 can be directly fixed on the housing 100, improving the installation reliability of the first elastic piece 301.

[0049] Through the above assembly method, the second elastic piece 302 can be stably and reliably fixed on the circuit board 200, and the first elastic piece 301 can be stably and reliably connected to the housing 100, and a reliable abutting relationship is formed between the second elastic piece 302 and the first elastic piece 301 to achieve a stable electrical connection between the second elastic piece 302 and the first elastic piece 301, ensuring the conductivity stability of the charging component 300. And compared with the prior art, the present application does not require welding connection, and the assembly efficiency is high. At the same time, the adhesive layer fills the gap between the first elastic piece 301 and the housing 100, which can prevent external dust and liquid from eroding the parts inside the housing 100 and improve the service life of the entire earphone 10.

[0050] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0051] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A headset, characterized in that, Comprising: A housing having an outer surface, and a limiting hole penetrating through the outer surface is formed in the housing; A circuit board disposed inside the housing, and A charging assembly electrically connected to the circuit board and having a contact surface for abutting against an external charging device. The limiting hole cooperates with the charging assembly to define the installation position of the charging assembly, and the contact surface and the outer surface are smoothly butted; The charging assembly includes a first elastic sheet and a second elastic sheet. The first elastic sheet is inserted into the limiting hole, the second elastic sheet is fixed on the circuit board, and the first elastic sheet and the second elastic sheet abut against each other; The housing has an inner surface opposite to the outer surface. The limiting hole includes a stepped hole and a first through hole communicating with each other. The stepped hole is recessed from the outer surface, and the first through hole is recessed from the bottom wall surface of the stepped hole and penetrates through the inner surface; the first elastic sheet includes a contact sheet and a first connecting sheet. The contact surface is disposed on the contact sheet. One end of the first connecting sheet is fixed on the surface of the contact sheet opposite to the contact surface. The contact sheet cooperates with the stepped hole, and the first connecting sheet is inserted into the first through hole and abuts against the second elastic sheet. The contact surface and the outer surface are flush with each other.

2. The earphone according to claim 1, wherein The housing includes a boss connected to the inner surface and protruding relative to the inner surface. The first connecting sheet includes a first connecting section and a second connecting section. One end of the first connecting section is fixed on the contact sheet, and the second connecting section is bent and connected to the other end of the first connecting section. The second connecting section abuts between the boss and the second elastic sheet.

3. The earphone according to claim 1, characterized in that, The limiting hole further includes a second through hole spaced from the first through hole. The second through hole is recessed from the bottom wall surface of the stepped hole and penetrates through the inner surface. The first elastic sheet further includes a second connecting sheet spaced from the first connecting sheet. The second connecting sheet is fixed on the surface of the contact sheet opposite to the contact surface, and a part of the second connecting sheet adheres to the inner surface and abuts against the housing.

4. The earphone according to claim 3, wherein A part of the second connecting sheet is inserted into the second through hole.

5. The earphone according to claim 1, wherein The second elastic sheet includes a fixing sheet and an abutting sheet. The abutting sheet is connected to the fixing sheet at an angle. The fixing sheet is fixedly disposed on the circuit board. The abutting sheet is elastically connected to the fixing sheet and abuts against the first elastic sheet.

6. The earphone according to claim 1, characterized in that The first elastic sheet has a first abutting surface facing the second elastic sheet, and the second elastic sheet has a second abutting surface facing the first elastic sheet. The first abutting surface and the second abutting surface abut against each other. The first abutting surface is a plane, the second abutting surface is an arc-shaped curved surface, and the area of the first abutting surface is larger than the area of the second abutting surface.

7. The earphone according to claim 1, wherein It further includes an adhesive layer located in the limiting hole. The adhesive layer is connected between the housing and the charging assembly and is used to seal the gap between the housing and the charging assembly.

8. The earphone according to claim 1, wherein The housing includes a front shell and a rear shell. The limiting hole is provided on the front shell, and the front shell and the rear shell are detachably connected.

9. The earphone according to claim 1, characterized in that The contact surface is a curved surface or a flat surface.

10. An assembling method for the earphone according to any one of claims 1 to 9, characterized in that, It includes the following steps: Thread a first elastic sheet through the limiting hole of the housing; Fix a second elastic sheet on the circuit board; Accommodate the circuit board with the second elastic sheet fixed therein in the housing, and bend a first connecting piece on the first elastic sheet so that the first elastic sheet abuts between the housing and the second elastic sheet; and Pour glue into the limiting hole so that the glue solidifies into an adhesive layer sealing the gap between the housing and the first elastic sheet.

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