Earphone charging box

Abstract

The earphone charging box comprises a shell, a circuit board and a key, wherein the shell is provided with a mounting cavity and a through hole, the through hole is communicated with the mounting cavity; the circuit board is accommodated in the mounting cavity, and the circuit board is provided with a switch contact; the key comprises a key body and an elastic supporting part which are connected, the key body and the elastic supporting part are an integral structure, the key body is slidably assembled in the through hole and is limited and blocked by the shell in the direction of being taken out through the through hole, and the elastic supporting part is elastically abutted with the circuit board; under the action of external force, the key body moves to the side of the circuit board and abuts against the switch contact, and the elastic supporting part is elastically deformed to accumulate elastic potential energy; under the state that the external force is removed, the elastic supporting part releases the elastic potential energy to drive the key body to reset. The technical scheme of the application can overcome the problem that the key is collapsed relative to the shell after installation due to the accumulation of various dimensional tolerances of parts of the existing Bluetooth earphone charging box.

Description

Technical Field

[0001] This application relates to the field of charging case technology, and in particular to an earphone charging case. Background Technology

[0002] In related technologies, a button is provided on the Bluetooth earphone charging case, which can be used to perform functions such as Bluetooth pairing and mode switching.

[0003] Structurally, the button is installed in a mounting hole on the charging case shell. Pressing the button triggers a switch on a circuit board located inside the shell. However, due to the mold tolerances inherent in the injection molding process of components such as the shell and button, individual components have dimensional tolerances. Furthermore, assembly gaps are required to achieve proper assembly. This accumulation of dimensional tolerances, including the inherent tolerances and assembly gaps, can easily lead to a deviation between the actual installation position of the button within the charging case and its designed position. When this deviation exceeds a certain range, the button may become misaligned within the mounting hole, resulting in the button collapsing relative to the shell. Utility Model Content

[0004] This application provides an earphone charging case that overcomes the problem of existing earphone charging cases where buttons collapse relative to the shell after installation due to the accumulation of various dimensional tolerances of components.

[0005] This application provides an earphone charging case, which includes a shell, a circuit board, and a button. The shell has a mounting cavity and a through hole, with the through hole communicating with the mounting cavity. The circuit board is housed in the mounting cavity and has a switch contact. The button includes a button body and an elastic support portion connected together. The button body and the elastic support portion are an integral structure. The button body is slidably mounted on the through hole and is limited and blocked by the shell in the direction of its movement through the through hole. The elastic support portion elastically abuts against the circuit board. Under the action of an external force, the button body moves toward the circuit board and abuts against the switch contact, and the elastic support portion undergoes elastic deformation to accumulate elastic potential energy. When the external force is removed, the elastic support portion releases the elastic potential energy to drive the button body to reset.

[0006] In one embodiment, the key body includes:

[0007] The pressing part is slidably fitted into the through hole; and

[0008] The limiting part is connected to the pressing part and abuts against the cavity wall of the mounting cavity;

[0009] The elastic support portion includes at least two elastic support legs, which are spaced apart from each other and connected to the side of the limiting portion facing the circuit board.

[0010] In one embodiment, the limiting portion is disc-shaped, and the at least two elastic support legs are evenly spaced along the circumference of the limiting portion.

[0011] In one embodiment, two elastic support legs are provided, and the two elastic support legs are symmetrically distributed radially along the limiting portion, wherein the distance between the two elastic support legs is increased in the direction toward the circuit board.

[0012] In one embodiment, the elastic support leg includes:

[0013] Transition section;

[0014] The first bending section is inclined from the end of the transition section toward the limiting portion and connected to the limiting portion; and

[0015] The second bending segment extends obliquely from the other end of the transition segment in a direction away from the limiting portion, and the second bending segment elastically abuts against the circuit board.

[0016] In one embodiment, the housing has a protrusion on the cavity wall of the mounting cavity, the through hole passes through the protrusion, and the limiting part abuts against the protrusion.

[0017] In one embodiment, the key body further includes:

[0018] A trigger protrusion is provided on the side of the limiting part facing the circuit board along the axial direction of the key body. The trigger protrusion is spaced apart from the switch contact. When the pressing part is in a pressed state, the trigger protrusion can abut against the switch contact.

[0019] In one embodiment, the pressing part includes:

[0020] A keycap with an internal cavity, the keycap being connected to the limiting part; and

[0021] A reinforcing rib is connected to the keycap and disposed in the cavity, and the trigger protrusion is connected to the reinforcing rib.

[0022] In one embodiment, the housing further includes a positioning protrusion on the cavity wall of the mounting cavity, and the button further includes:

[0023] An elastic arm extends and is disposed on the periphery of the limiting portion and is connected to the positioning protrusion.

[0024] In one embodiment, the elastic arm includes:

[0025] The first arm protrudes radially from the periphery of the limiting portion;

[0026] The second arm extends circumferentially from the first arm along the limiting portion; and,

[0027] The cylinder is located at the end of the second arm that is away from the first arm and is connected to the positioning protrusion fixed sleeve.

[0028] Based on the above embodiments, the headphone charging case provided by this application integrally molds the button body and the elastic support part. The elastic support part provides the elastic force for reset during button pressing. Compared with the prior art, which requires additional parts such as springs and tumblers to act on the button body in the headphone charging case to achieve button reset, the solution of this application does not require additional separate parts such as springs and tumblers, thus reducing the number of parts. This can reduce the accumulation of dimensional tolerances caused by the parts themselves and assembly to a certain extent, thereby reducing the possibility of the button collapsing relative to the shell after assembly. This can improve the tactile feedback during button use, improve product yield, and reduce manufacturing costs. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the overall structure of the earphone charging case of this utility model;

[0031] Figure 2 This is a partial assembly diagram of the earphone charging case of this utility model;

[0032] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0033] Figure 4 This is a schematic diagram of the button structure in this utility model;

[0034] Figure 5 This is a schematic diagram of the shell structure in this utility model.

[0035] Explanation of icon numbers:

[0036] 100-Earphone charging case, 10-Shell, 11-Lid, 12-Box body, 121-Shaped groove, 122-Mounting cavity, 123-Through hole, 13-Middle shell, 14-Outer shell, 141-Protrusion, 142-Positioning protrusion, 20-Circuit board, 21-Switch contact, 30-Button, 31-Button body, 311-Pressing part, 3111-Keycap, 3112-Cavity, 3113-Reinforcing rib, 312-Limiting part, 313-Trigger protrusion, 32-Elastic support part, 321-Elastic support leg, 3211-Transition section, 3212-First bending section, 3213-Second bending section, 33-Elastic arm, 331-First arm body, 332-Second arm body, 333-Cylinder body.

[0037] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0039] Where the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0040] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] Earphone charging cases are typically used in conjunction with Bluetooth earphones. The charging case provides functions such as power replenishment, storage, and protection for Bluetooth earphones, making them more convenient to use.

[0043] The earphone charging case usually also has a button, which is installed in a mounting hole on the shell of the charging case. During use, users can press the button to perform functions such as Bluetooth pairing and mode switching. In related technologies, in order to enable the button to reset after being pressed, other components such as springs, contact springs, and elastic washers are used to elastically abut against the button. When the button is pressed, these components undergo elastic deformation and accumulate elastic potential energy. When the user releases the button, these components release elastic force and drive the button to reset.

[0044] However, during the mold manufacturing process for components such as buttons and housings, dimensional tolerances exist in the molds themselves, resulting in inherent dimensional tolerances in the manufactured components. To achieve assembly, designers need to include gaps in the mounting holes for the buttons—that is, pre-designed assembly gaps. This accumulation of dimensional tolerances, including the component's own tolerances and these gaps, can easily lead to deviations between the actual and designed positions of the buttons within the earphone charging case. When these deviations exceed a certain range, the buttons may misalign within the mounting holes, causing them to collapse relative to the housing. Understandably, this collapse can reduce the tactile feedback of the button's press, and excessive collapse can affect its normal function.

[0045] To address the above issues, in one embodiment, please refer to... Figure 1 and Figure 2 This application provides an earphone charging case 100, which includes a shell 10, a circuit board 20, and a button 30. Of course, Figure 1 and Figure 2 The diagram shows a partial structure of the headphone charging case 100. It can be understood that the headphone charging case 100 also includes a battery (not shown), which is disposed inside the housing 10. The battery is electrically connected to the circuit board 20 and can charge the Bluetooth headphones placed in the headphone charging case 100.

[0046] The housing 10 includes a cover 11 and a box 12. The box 12 has a contoured groove 121 for placing a Bluetooth headset. The cover 11 is connected to the box 12 and can close onto the contoured groove 121 to hide and store the Bluetooth headset placed in the contoured groove 121. The cover 11 can be rotatably connected to the box 12 to open or close the contoured groove 121 by flipping. Alternatively, the cover 11 can be slidably connected to the box 12 to open or close the contoured groove 121 by sliding. This application does not limit the specific connection method between the cover 11 and the box 12.

[0047] In one embodiment, the housing 12 may include a middle shell 13 and an outer shell 14, with the middle shell 13 fitted inside the outer shell 14. The aforementioned contoured groove 121 is formed on the middle shell 13. A mounting cavity 122 is also formed between the middle shell 13 and the outer shell 14, and the aforementioned battery and circuit board 20 are both housed within the mounting cavity 122. It is understood that, in order to enable charging of the Bluetooth headset placed in the contoured groove 121, charging contacts can be provided on the middle shell 13. The charging contacts are electrically connected to the circuit board 20 and extend into the contoured groove 121. In one embodiment, a through hole 123 is also provided on the outer shell 14, which communicates with the mounting cavity 122, and the button 30 is fitted at the through hole 123.

[0048] Please refer to the reference. Figure 3 In one embodiment, the key 30 includes a key body 31 and an elastic support 32 connected together. The key body 31 and the elastic support 32 are an integral structure. The key body 31 is slidably mounted in the through hole 123 and is limited and blocked by the housing 10 in the direction of its release through the through hole 123. The elastic support 32 elastically abuts against the circuit board 20. That is, in the solution of this application, when the key 30 is not under force, the elastic support 32 is in a pre-compression state, so that the key body 31 is supported in a preset installation position in the through hole 123. Here, the preset installation position of the key body 31 in the through hole 123 can be a position where the outer surface of the key body 31 is approximately flush with the outer wall surface of the outer shell 14 in the housing 10.

[0049] During use, the user applies external force to the key body 31 of the button 30. The key body 31 moves along the through hole 123 toward the circuit board 20 and abuts against the switch contact 21 on the circuit board 20 to generate a switch signal. During this process, the elastic support 32 undergoes elastic deformation to accumulate elastic potential energy. When the user removes the external force, the elastic support 32 releases the elastic potential energy to drive the key body 31 to reset. It can be understood that during the above process, the direction in which the key body 31 is released through the through hole 123 is limited and blocked by the housing 10. This can be understood as follows: when the elastic support 32 provides elastic force, and the key body 31 resets to a position where the outer surface of the key body 31 is approximately flush with the outer wall of the housing 14, the key body 31 will be blocked by the housing 14 or other internal structures and will not further detach from the housing 14.

[0050] It should be noted that the key body 31 and the elastic support part 32 are an integral structure. The key 30 can be manufactured as a whole by injection molding using an elastic material such as silicone or thermoplastic polyurethane. Of course, the key 30 can also be made of multiple materials. For example, the key body 31 can be made of rigid plastic, while the elastic support part 32 can be made of elastic silicone, and the two parts can be manufactured by secondary injection molding.

[0051] Therefore, the headphone charging case 100 provided by this application integrally forms the button body 31 and the elastic support part 32 of the button 30. The elastic support part 32 provides the elastic force for the button 30 to reset during the pressing process. Compared with the prior art, which requires additional parts such as springs, silicone gaskets, etc. to act on the button body 31 in the headphone charging case to achieve the button 30 reset, the solution of this application does not require additional separate parts such as springs, etc., thus reducing the number of parts. This can reduce the accumulation of dimensional tolerances caused by the parts themselves and the assembly to a certain extent, thereby reducing the situation where the button 30 collapses relative to the shell 10 after the button 30 is assembled. This can improve the feedback feel of the button 30 during use, and also improve the product yield and reduce the manufacturing cost.

[0052] Please refer to the reference again. Figures 1 to 3 In one embodiment, the key body 31 includes a pressing part 311 and a limiting part 312, wherein the cross-sectional shape of the pressing part 311 is adapted to the opening shape of the through hole 123, and the pressing part 311 is slidably mounted in the through hole 123. The limiting part 312 is connected to the end of the pressing part 311 facing the circuit board 20 and abuts against the cavity wall of the mounting cavity 122.

[0053] In one embodiment, the limiting part 312 is a disc-shaped structure, and the outer diameter of the limiting part 312 is larger than the outer diameter of the pressing part 311 and the diameter of the through hole 123. The dimension of the pressing part 311 along its axial direction is equivalent to the depth of the through hole 123. In this way, when the key body 31 is reset to a position where the outer surface of the pressing part 311 is approximately flush with the outer surface of the outer shell 14, the limiting part 312 will abut against the cavity wall of the mounting cavity 122 to limit the key body 31.

[0054] In one embodiment, the elastic support portion 32 includes at least two elastic support legs 321, which are spaced apart and connected to the side of the limiting portion 312 facing the circuit board 20. The elastic support legs 321 are connected to the end face of the disc-shaped limiting portion 312 facing the circuit board 20. In this embodiment, the elastic support legs 321 are elongated and extend towards the circuit board 20. Thus, under pressure, the elastic support legs 321 are more likely to undergo elastic deformation and accumulate elastic potential energy, which is then released to reset the key body 31 when the external force is removed.

[0055] exist Figures 1 to 3 In the exemplary solution, two elastic support legs 321 are provided, and the two elastic support legs 321 are evenly spaced along the circumference of the limiting part 312. In this way, when the key body 31 is subjected to force, the two elastic support legs 321 are subjected to force more evenly. This makes it less likely that the key body 31 will be tilted due to uneven force during sliding along the through hole 123, and thus prevents jamming.

[0056] Furthermore, in the case of two elastic support legs 321, to improve the elastic support effect of the elastic support legs 321 on the entire key body 31, this embodiment can be further configured such that the distance between the two elastic support legs 321 is increased in the direction towards the circuit board 20. In this embodiment, the elastic support legs 321 can be connected to the periphery of the limiting part 312. In this way, the position where the two elastic support legs 321 abut against the circuit board 20 will be located outside the orthogonal projection of the entire key body 31 onto the circuit board 20. As a result, during the process of the elastic support legs 321 providing elastic force to reset the key body 31, the generated torque will make the movement of the key body 31 more stable.

[0057] Understandably, the number of elastic support legs 321 in this application can also be 3, 4, etc. When there is an odd number of elastic support legs 321, the multiple elastic support legs 321 are evenly spaced along the circumference of the limiting part 312. When there is an even number of elastic support legs 321, the multiple elastic support legs 321 can be evenly spaced along the circumference of the limiting part 312, or symmetrically arranged around the center of the limiting part 312.

[0058] In implementation, please combine Figure 3 and Figure 4 As shown, the elastic support leg 321 includes a transition section 3211, a first bent section 3212, and a second bent section 3213. The first bent section 3212 extends obliquely from the end of the transition section 3211 toward the limiting portion 312, while the second bent section 3213 extends obliquely from the other end of the transition section 3211 toward the direction away from the limiting portion 312. The end of the second bent section 3213 abuts against the circuit board 20. With this configuration, the transition section 3211, the first bent section 3212, and the second bent section 3213 are arranged at an angle to each other. This structural form makes it easier for the elastic support leg 321 to generate elastic deformation during the force process, so as to provide the elastic force required for reset, and the tactile sensation obtained when the user presses the button body 31 is better.

[0059] It is understood that in other embodiments, the elastic support leg 321 may be an arc-shaped or curved structure, or a single-segment structure that extends obliquely between the circuit board 20 and the limiting part 312, in addition to the multi-segment structure described above.

[0060] In the above embodiments of this application, the elastic support portion 32 is formed in the form of an elastic support leg 321. Since the elastic support leg 321 can be made into a thin strip, its own weight is relatively light. In this way, while meeting the reset requirements of the key body 31, the weight of the entire key 30 can also be reduced to a certain extent, thereby reducing the manufacturing cost of the key 30.

[0061] Of course, in addition to the embodiment of the elastic support leg 321 mentioned above, the elastic support part 32 can also be formed as a ring structure, such as a structure similar to a corrugated pipe, or a tube structure with mesh, etc.

[0062] Please refer to Figures 2 to 5 , Figure 5 The diagram shows a partial cross-sectional view of the housing 10. In one embodiment, the outer shell 14 has a protrusion 141 protruding from the cavity wall of the mounting cavity 122. A through hole 123 penetrates the outer wall of the outer shell 14 and the protrusion 141 in the thickness direction. The protrusion 141 abuts against the limiting portion 312 of the button 30. The protrusion 141 increases the axial dimension of the through hole 123 without increasing the wall thickness of the outer shell 14. Since the size of the key body 31 in this application is comparable to the size of the through hole 123, the key body 31 and the through hole 123 also have a longer axial mating dimension, resulting in better support of the key body 31 by the through hole 123. This reduces the risk of the button 30 swaying or swinging within the through hole 123. Furthermore, the protrusion 141 also enhances the structural strength of the mating position between the outer shell 14 and the key body 31, improving the overall reliability of the device.

[0063] In one implementation, please refer to Figure 4 and Figure 5 A positioning protrusion 142 protrudes from the cavity wall of the mounting cavity 122 on the outer shell 14. The button 30 also includes an elastic arm 33, which extends from the periphery of the limiting part 312 and connects to the positioning protrusion 142. It is understood that in the earphone charging case 100 of this application, the button 30, by providing an elastic support part 32 that is integrally formed with the button body 31, can basically meet the reset requirements of the button 30. In this embodiment, by further providing an elastic arm 33 connected to the outer casing 14, the elastic arm 33 will also undergo elastic deformation during the pressing of the button 30. The elastic arm 33 will also provide elastic restoring force to the button 30, thereby improving the pressing feel of the button 30. Furthermore, the elastic arm 33 extends circumferentially along the limiting part 312, and can also play a role in circumferentially supporting and limiting the key body 31. This allows the axial direction of the key body 31 to be consistent with the axial direction of the through hole 123 on the substrate during the pressing process, making the entire operation process smoother.

[0064] In one embodiment, the elastic arm 33 includes a first arm body 331, a second arm body 332, and a cylindrical body 333. The first arm body 331 protrudes radially along the periphery of the limiting portion 312, and is preferably integrally formed with the limiting portion 312. The second arm body 332 extends from the first arm body 331 along the periphery of the limiting portion 312. Thus, the first arm body 331 and the second arm body 332 roughly form an "S" shape, giving the elastic arm 33 good elastic deformation capability and making full use of the periphery space of the button 31. Furthermore, this application provides a cylindrical body 333 on the elastic arm 33 that engages with the positioning protrusion 142. This allows the entire button 30 to be pre-positioned onto the outer shell 14 during production by engaging the cylindrical body 333 with the positioning protrusion 142, facilitating subsequent assembly of other components and improving the assembly efficiency of the entire earphone charging case 100.

[0065] To improve the positioning effect, in one embodiment, the outer shell 14 has multiple positioning protrusions 142 protruding from the cavity wall of the mounting cavity 122. Correspondingly, multiple elastic arms 33 are also configured, all located on the periphery of the limiting part 312 and connected to the limiting part 312. Each elastic arm 33 is connected to the corresponding positioning protrusion 142 by plugging. In this way, the multiple positioning protrusions 142 and the elastic arms 33 cooperate to constrain and fix the button 30 from multiple directions. Furthermore, after installation, the cylinder 333 and the positioning protrusions 142 can be fixedly connected together by means of adhesive dispensing, heat fusion, etc., so that the end of the elastic arm 33 is fixed to the outer shell 14.

[0066] In one embodiment, please refer to the following for details. Figure 2 , Figure 3 and Figure 4 As shown, the key body 31 also includes a trigger protrusion 313, which protrudes from the limiting part 312 on the side facing the circuit board 20. In the axial direction of the pressing part 311, when the pressing part 311 of the key 30 is not operated, the trigger protrusion 313 maintains a distance from the switch contact 21 of the circuit board 20. When the pressing part 311 is subjected to pressure applied by the user, the elastic support leg 321 of the elastic support part 32 undergoes elastic deformation first, driving the limiting part 312 and the trigger protrusion 313 to move towards the circuit board 20. As the pressing stroke advances, the trigger protrusion 313 will be able to stably and accurately abut against the switch contact 21, thereby triggering the corresponding control signal to complete operation commands such as starting charging or pairing Bluetooth.

[0067] Preferably, such as Figure 4 As shown, the pressing part 311 includes a keycap 3111 and a reinforcing rib 3113. The keycap 3111 has an internal cavity 3112 and is integrally connected to the elastic support part 32. This not only ensures efficient force transmission but also helps reduce gaps and tolerances caused by assembly. The reinforcing rib 3113 is located inside the cavity 3112 of the keycap 3111 and is integrally molded with both the keycap 3111 and the elastic support part 32, greatly improving the overall strength and deformation resistance of the pressing part 311 and effectively avoiding deformation and cracking caused by localized stress concentration in the keycap 3111. Furthermore, it contributes to the miniaturization and lightweighting of the product, further enhancing its market competitiveness and user experience.

[0068] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0069] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An earphone charging case, characterized in that, include: The housing has a mounting cavity and a through hole, the through hole being connected to the mounting cavity; A circuit board is housed in the mounting cavity, and the circuit board is provided with switch contacts; as well as A button includes a key body and an elastic support portion connected together. The key body and the elastic support portion are an integral structure. The key body is slidably mounted on the through hole and is limited and blocked by the housing in the direction of exiting through the through hole. The elastic support portion elastically abuts against the circuit board. Under the action of external force, the key body moves toward the side of the circuit board and abuts against the switch contact, and the elastic support part generates elastic deformation to accumulate elastic potential energy. When the external force is removed, the elastic support part releases the elastic potential energy to drive the key body to reset.

2. The earphone charging case as described in claim 1, characterized in that, The key body includes: The pressing part is slidably fitted into the through hole; and The limiting part is connected to the pressing part and abuts against the cavity wall of the mounting cavity; The elastic support portion includes at least two elastic support legs, which are spaced apart from each other and connected to the side of the limiting portion facing the circuit board.

3. The earphone charging case as described in claim 2, characterized in that, The limiting part is disc-shaped, and the at least two elastic support legs are evenly spaced along the circumference of the limiting part.

4. The earphone charging case as described in claim 2, characterized in that, Two elastic support legs are provided, and the two elastic support legs are symmetrically distributed radially along the limiting portion, wherein the distance between the two elastic support legs is increased in the direction toward the circuit board.

5. The earphone charging case as described in claim 4, characterized in that, The elastic support leg includes: Transition section; The first bending section is inclined from the end of the transition section toward the limiting portion and connected to the limiting portion; and The second bending segment extends obliquely from the other end of the transition segment in a direction away from the limiting portion, and the second bending segment elastically abuts against the circuit board.

6. The earphone charging case as described in claim 2, characterized in that, The housing has a protrusion on the cavity wall of the mounting cavity, the through hole passes through the protrusion, and the limiting part abuts against the protrusion.

7. The earphone charging case as described in claim 2, characterized in that, The key body also includes: A trigger protrusion is provided on the side of the limiting part facing the circuit board along the axial direction of the key body. The trigger protrusion is spaced apart from the switch contact. When the pressing part is in a pressed state, the trigger protrusion can abut against the switch contact.

8. The earphone charging case as described in claim 7, characterized in that, The pressing part includes: A keycap with an internal cavity, the keycap being connected to the limiting part; and A reinforcing rib is connected to the keycap and disposed in the cavity, and the trigger protrusion is connected to the reinforcing rib.

9. The earphone charging case as described in any one of claims 2 to 8, characterized in that, The housing also has a positioning protrusion on the cavity wall of the mounting cavity, and the button further includes: An elastic arm extends and is disposed on the periphery of the limiting portion and is connected to the positioning protrusion.

10. The earphone charging case as described in claim 9, characterized in that, The elastic arm includes: The first arm protrudes radially from the periphery of the limiting portion; The second arm extends circumferentially from the first arm along the limiting portion; and, The cylinder is located at the end of the second arm that is away from the first arm and is connected to the positioning protrusion fixed sleeve.

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