Earphone charging box

Abstract

The utility model discloses an earphone charging box. The earphone charging box comprises a box body, a circuit board and a spring contact pin. The box body is provided with a first placing groove used for placing an earphone, a through hole is formed in the first placing groove, and the circuit board is installed in the box body. The spring contact needle is installed in the box body and comprises a needle tube, a needle head and a spring, the spring is arranged in the needle tube, and one end of the needle head extends out relative to the needle tube. One end of the needle tube away from the needle is in the first placing groove. According to the spring contact needle, the needle tube is arranged in the containing groove, the needle head faces downwards and is used for being electrically connected with the circuit board, therefore, a gap between the needle tube and the needle head faces downwards, sweat flows from top to bottom, and therefore when the sweat flows to the connecting position of the needle tube and the needle head along the needle tube, the sweat only continues to flow downwards due to the gravity effect and does not enter the gap, and the sweat cannot enter the circuit board. The invalidation of the spring contact needle due to the immersion of sweat is avoided, and the service life of the spring contact needle is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to earphone equipment technical field, concretely relates to an earphone charging box. BACKGROUND

[0002] With the rapid development of electronic equipment, it also promotes the rise of intelligent wearable devices, such as smart bracelets, smart watches, Bluetooth earphones and the like. Bluetooth earphones are connected with audio devices (such as mobile phones, computers, tablets and the like) through Bluetooth technology, without physical cables, and are more convenient and free to use. However, Bluetooth earphones need to be charged due to wireless connection, and therefore earphone charging boxes are often configured to place earphones in the earphone charging box to achieve charging of the earphones through electrical conduction. Spring contact pins, as a kind of special connector, have been widely used in electronic products such as mobile phones and earphones to play an electrical connection role. The traditional way of spring contact pins as charging electrodes is to attach a needle tube patch to a circuit board, with the needle head exposed in a placement slot for placing earphones. When the earphones are placed in the placement slot, the contact of the earphones abuts against the needle head, the needle head is compressed into the needle tube, and the needle head and the needle tube are electrically conductive, thereby achieving electrical connection. However, the earphone charging box in the prior art has the following problems: the surface of the earphones is often stained with the user's sweat during wearing, especially for sports earphones. In this case, after the earphones are placed in the placement slot, the sweat on the surface of the earphones will flow into the interior of the spring contact pin through the gap between the needle head and the needle tube. After the moisture in the sweat evaporates, crystalline will be left behind. With the increase of use time, the crystalline will gradually accumulate and block the extension and retraction of the needle head, thereby causing the spring contact pin to fail. SUMMARY

[0003] The utility model aims at solving at least one of the technical problems existing in the prior art. To this end, the utility model provides an earphone charging box, which can avoid failure of the spring contact pin due to immersion of sweat.

[0004] The earphone charging box according to the embodiment of the utility model comprises a box body, a circuit board and a spring contact pin. The box body has a first placement slot for placing earphones, a through hole is formed in the first placement slot, and the circuit board is installed in the box body. The spring contact pin is installed in the box body, the spring contact pin comprises a needle tube, a needle head and a spring, the spring is arranged in the needle tube, the needle head has a first end and a second end, the first end is connected to the spring and located in the needle tube, and the second end protrudes relative to the needle tube. The second end is electrically conductive with the circuit board, a part of the needle tube penetrates through the through hole, and one end of the needle tube away from the needle head is located in the first placement slot.

[0005] The earphone charging box according to the embodiment of the present invention has at least the following beneficial effects: In the prior art, there is a problem that sweat flows into the interior of the spring contact needle through the gap between the needle and the needle tube, thereby volatilizing and leaving crystals and gradually accumulating, thereby hindering the extension and contraction of the needle and causing the spring contact needle to fail. In essence, this is because the gap between the needle and the needle tube is facing upward, and the sweat flows from top to bottom along the needle, and naturally some of it will flow into the gap. Compared with the prior art, the spring contact needle in the earphone charging box of the embodiment of the present invention is inverted, and the needle tube is set in the placement groove, and the needle head is facing downward for electrical conduction with the circuit board. Therefore, the gap between the needle tube and the needle head is facing downward. Since sweat flows from top to bottom, when the sweat flows along the needle tube to the connection between the needle tube and the needle head, it will only continue to flow downward due to gravity, and will not enter the gap, thereby avoiding the failure of the spring contact needle due to the immersion of sweat, and improving the service life of the spring contact needle.

[0006] According to some embodiments of the present invention, the needle tube includes a main body portion and a protruding portion that are connected to each other, and the protruding portion surrounds the outer circumference of the main body portion and protrudes relative to the outer circumference of the main body portion.

[0007] According to some embodiments of the present invention, the protrusion has a first surface and a second surface arranged opposite to each other in the axial direction, the box body is provided with an abutment surface arranged opposite to the first surface, the distance between the abutment surface and an end of the through hole close to the first placement groove is L1, and the maximum distance between the second surface and the end face of the second end is L2, L1>L2.

[0008] According to some embodiments of the present invention, the diameter of the through hole is D1, the diameter of the second end is D2, the diameter of the end of the needle tube away from the needle head is D3, and D3≤D1<D2.

[0009] According to some embodiments of the present invention, the through hole is also connected to a second placement groove for placing the spring contact needle, and the needle tube includes a main body and a protrusion connected to each other, and the main body includes a first section and a second section distributed along the axial direction, the first section connects the needle head and the second section, the diameter of the second section is smaller than the diameter of the first section to form a stepped surface, and the stepped surface abuts the bottom wall of the second placement groove.

[0010] According to some embodiments of the present invention, at least a portion of the first section is located in the second placement groove, and a distance between an outer peripheral surface of the first section and an inner wall surface of the second placement groove is L3, 0.03mm≤L3≤0.2mm.

[0011] According to some embodiments of the present invention, at least a portion of the second section is located in the through hole, and a distance between an outer peripheral surface of the second section and an inner wall surface of the through hole is L4, 0<L4≤0.15mm.

[0012] According to some embodiments of the present invention, one end of the needle tube away from the needle head extends relative to the first placement groove, and the surface of the one end of the needle tube away from the needle head is a spherical surface.

[0013] According to some embodiments of the present invention, a metal conductive area is provided on a surface of the circuit board facing the spring contact needle, and the metal conductive area is used to abut against the needle head.

[0014] According to some embodiments of the present invention, the spring is in a compressed state, and the elastic force of the spring is used to drive the needle to abut against the circuit board.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a first stereoscopic view of an earphone charging box in one embodiment of the present invention;

[0018] Figure 2 This is a second perspective view of the earphone charging box in one embodiment of the present invention;

[0019] Figure 3 This is an exploded view of an earphone charging box in one embodiment of the present invention;

[0020] Figure 4 This is a three-dimensional diagram of the spring contact pins of the earphone charging box in one embodiment of the present invention;

[0021] Figure 5 This is an exploded view of the spring contact pins of the earphone charging box in one embodiment of the present invention;

[0022] Figure 6 This is a cross-sectional view of a spring contact pin of an earphone charging box in one embodiment of the present invention;

[0023] Figure 7 This is a top view of an earphone charging box in one embodiment of the present invention;

[0024] Figure 8 for Figure 7 Section view at section line AA;

[0025] Figure 9 for Figure 8 Enlarged view of area B in the middle;

[0026] Figure 10 for Figure 8 Schematic diagram of the spring contact pins in area B after flipping.

[0027] Figure numerals: earphone charging box 100, box body 101, first placement slot 102, circuit board 201, spring contact needle 301, metal conductive area 302, through hole 303, needle tube 401, needle head 402, main body 403, protrusion 404, first section 405, second section 406, second end 407, spring 501, first end 502, first surface 601, second surface 602, stepped surface 603, second placement slot 901, abutment surface 902. DETAILED DESCRIPTION

[0028] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0030] In the description of this utility model, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of the terms "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, or implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] In the description of the present invention, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0033] refer to Figures 1 to 6 According to an embodiment of the present invention, the earphone charging box 100 includes a box body 101, a circuit board 201, and a spring contact pin 301. The box body 101 has a first placement slot 102 for placing earphones. The first placement slot 102 has a through hole 303. The circuit board 201 is installed in the box body 101. The spring contact pin 301 is installed in the box body 101. The spring contact pin 301 includes a needle tube 401, a needle head 402, and a spring 501. The spring 501 is arranged in the needle tube 401. The needle head 402 has a first end 502 and a second end 407. The first end 502 is connected to the spring 501 and is located in the needle tube 401. The second end 407 extends relative to the needle tube 401. The second end 407 is electrically conductive with the circuit board 201. A portion of the needle tube 401 passes through the through hole 303, and the end of the needle tube 401 away from the needle head 402 is located in the first placement slot 102. In the prior art, there is a problem that sweat flows into the interior of the spring contact needle 301 through the gap between the needle 402 and the needle tube 401, thereby volatilizing and leaving crystals that gradually accumulate, thereby hindering the extension and contraction of the needle 402 and causing the spring contact needle 301 to fail. Essentially, this is because the gap between the needle 402 and the needle tube 401 is facing upward, and sweat flows from top to bottom along the needle 402, and naturally some of it will flow into the gap. Compared with the prior art, the spring contact needle 301 in the earphone charging box 100 of the present invention is The technology is flipped, the needle tube 401 is set in the placement groove, and the needle head 402 is facing downward for electrical conduction with the circuit board 201. Therefore, the gap between the needle tube 401 and the needle head 402 is facing downward. Since sweat flows from top to bottom, when the sweat flows along the needle tube 401 to the connection between the needle tube 401 and the needle head 402, it will only continue to flow downward due to the action of gravity and will not enter the gap, thereby avoiding the spring contact needle 301 from failing due to the immersion of sweat, and improving the service life of the spring contact needle 301.

[0034] It should be noted that, in some embodiments of the present invention, Figures 1 to 3The figure shows a part of the earphone charging box 100. A bottom plate and other structures are provided below the circuit board 201. Together with the parts shown in the figure, they form the box body 101 and the circuit board 201 and the spring contact pin 301 are provided therein. Figures 1 to 3 The structure and arrangement of the circuit board 201 and the spring contact pins 301 are more intuitively shown in the figure, so the rest of the figure is not shown. Meanwhile, in some embodiments of the present invention, the earphone charging case 100 further includes a lid, which is rotatably connected to the case body 101 and is used to open and close relative to the case body 101 to allow the earphones to be removed from the first placement slot 102 or placed into the first placement slot 102 from the outside.

[0035] refer to Figures 4 to 6 In some embodiments of the present invention, the needle tube 401 includes a main body 403 and a protruding portion 404 connected to each other, and the protruding portion 404 surrounds the outer circumference of the main body 403 and protrudes relative to the outer circumference of the main body 403. Figure 6 As shown, a surrounding protrusion 404 is provided on the periphery of the main body 403 extending in the vertical direction, which can further prevent the infiltration of liquids such as sweat. When the liquid flows from top to bottom to the protrusion 404, due to the obstruction of the protrusion 404, the liquid will flow in the direction away from the gap between the needle head 402 and the needle tube 401, and the protrusion 404 increases the peripheral surface area of ​​the needle tube 401, so that a larger proportion of the liquid evaporates during the flow, reducing the probability of flowing into the spring contact needle 301.

[0036] It should be noted that the reference Figure 5 In some embodiments of the present invention, the first end 502 of the needle 402 disposed within the needle tube 401 is beveled. This beveled design ensures contact stability and increases the contact area between the needle 402 and the needle tube 401. This close contact helps reduce contact impedance, thereby ensuring stable conduction of the product. The beveled structure has low impedance and stable performance. The beveled design also helps reduce the resistance value, keeping it at a stable and low level, reducing the probability of transient disconnection, and can also improve the current flow capacity, resulting in better electrical performance of the spring contact needle 301.

[0037] refer to Figures 6 to 10 In some embodiments of the present invention, the protrusion 404 has a first surface 601 and a second surface 602 disposed opposite to each other in the axial direction. The box body 101 has an abutment surface 902 disposed opposite to the first surface 601. The distance between the abutment surface 902 and the end of the through hole 303 near the first placement groove 102 is L1. The maximum distance between the second surface 602 and the end surface of the second end 407 is L2, and L1>L2. This design can effectively prevent the spring contact pin 301 from being reversed during installation. Specifically, refer to Figure 9 When the spring contact needle 301 is installed correctly, one end of the needle tube 401 extends relative to the through hole 303 and is located in the first placement groove 102. After installation, it can be manually observed by the staff or the state of the first placement groove 102 can be observed using a detection camera to determine whether the current installation is correct; Figure 10 When the spring contact pin 301 is inverted, the needle head 402 faces upward and the needle tube 401 faces downward. During installation, the abutting surface 902 will abut against the second surface 602. At this time, since L2 is less than L1, the second end 407 of the needle head 402 cannot be exposed in the through hole 303. Manual or camera observation in the first placement groove 102 shows that the spring contact pin 301 is not exposed, indicating that the current spring contact pin 301 is installed incorrectly. Therefore, the installation status of the spring contact pin 301 can be intuitively detected to avoid the occurrence of inverted installation.

[0038] It should be noted that the reference Figure 9 In some embodiments of the present invention, when the spring contact pin 301 is correctly installed, there is a gap between the abutting surface 902 and the first surface 601. On the one hand, this gap is to separate the situation during flip-up installation, so that the abutting surface 902 only abuts the second surface 602 during flip-up installation. On the other hand, it is a reserved assembly gap for installing the spring contact pin 301, that is, a gap is left in the vertical direction to ensure that the spring contact pin 301 can be installed in place.

[0039] refer to Figure 6 、 Figure 8 and Figure 9 In some embodiments of the present invention, the diameter of the through hole 303 is D1, the diameter of the second end 407 is D2, and the diameter of the end of the needle tube 401 away from the needle head 402 is D3, where D3≤D1<D2. This design is also intended to prevent the spring contact pin 301 from being inverted. Since D3≤D1, the end of the needle tube 401 away from the needle head 402, i.e., the second section 406, can be smoothly inserted into the through hole 303. However, when the spring contact pin 301 is inverted, the diameter D2 of the second end 407 of the needle head 402 is greater than the diameter D1 of the through hole 303, so the needle head 402 cannot be smoothly inserted into the through hole 303. Therefore, manual observation or inspection of the first placement slot 102 by a camera will show that the spring contact pin 301 is not exposed, indicating that the current spring contact pin 301 is incorrectly installed. Therefore, the installation status of the spring contact pin 301 can be intuitively detected, and the occurrence of inverted installation can also be avoided.

[0040] It should be noted that in some embodiments of the present invention, one of the anti-flip design using different diameters and the anti-flip design using different lengths at both ends of the protrusion can be selected according to actual needs, and both designs can be applied to the spring contact pin 301.

[0041] refer to Figures 4 to 6 as well as Figure 9 In some embodiments of the present invention, the through hole 303 is also connected to a second placement groove 901 for placing the spring contact needle 301. The needle tube 401 includes a main body 403 and a protrusion 404 that are connected to each other. The main body 403 includes a first section 405 and a second section 406 distributed along the axial direction. The first section 405 connects the needle head 402 and the second section 406. The diameter of the second section 406 is smaller than the diameter of the first section 405 to form a stepped surface 603. The stepped surface 603 abuts the bottom wall of the second placement groove 901. The design of the second placement groove 901 is to make the spring contact needle 301 more accurate and intuitive during the installation process, and to prevent the spring contact needle 301 from shaking significantly during use. The provision of the stepped surface 603 allows the spring contact needle 301 to abut against the bottom wall of the second placement groove 901 through the stepped surface 603 after installation, thereby achieving accurate positioning in the vertical direction, improving installation consistency, and reducing quality fluctuations. It should be noted that, with reference to Figure 1 and Figure 3 There are multiple spring contact pins 301 and through holes 303. At this time, the stepped surface 603 of the spring contact pin 301 can make the length of each spring contact pin 301 extending relative to the through hole 303 consistent, so that the charging effect of the earphones is also consistent.

[0042] refer to Figure 9In some embodiments of the present invention, at least part of the first section 405 is located in the second placement groove 901, and the distance between the outer circumference of the first section 405 and the inner wall of the second placement groove 901 is L3, 0.03mm≤L3≤0.2mm. The needle tube 401 in the prior art is installed on the circuit board 201 through the patch process, and then the needle head 402 passes through the through hole 303 and extends into the first placement groove 102. Taking into account the patch tolerance, the inclination of the spring contact needle 301 and the assembly error of the component, the gap between the box body 101 and the spring contact needle 301 must reach more than 0.25mm. The spring contact needle 301 of the embodiment of the present invention is directly placed in the second placement groove 901, without patching on the circuit board 201, and there is no need to consider the patch tolerance. Therefore, the outer circumference of the first section 405 and the inner wall of the second placement groove 901 can be The range of the distance L3 is limited to between 0.03mm and 0.2mm, specifically, it can be 0.03mm, 0.1mm, 0.2mm and other values. When the gap is greater than 0.2mm, the gap is too large and the spring contact pin 301 shakes obviously. When the gap is less than 0.03mm, the gap is too small. The spring contact pin 301 will have a slight deformation and shake due to the influence of temperature and telescopic movement during use. A too small gap is not conducive to the deformation and shaking of the spring contact pin 301. An appropriate gap can reduce the shaking of the spring contact pin 301 and improve the stability of the overall structure.

[0043] refer to Figure 9 In some embodiments of the present invention, at least a portion of the second section 406 is located within the through-hole 303. The distance L4 between the outer circumference of the second section 406 and the inner wall of the through-hole 303 is 0<L4≤0.15mm. Because the second section 406 is also located within the first placement groove 102, for aesthetic reasons, the distance L4 between the outer circumference of the second section 406 and the inner wall of the through-hole 303 is made smaller, controlled between 0 and 0.15mm. Specifically, it can be 0.05mm, 0.1mm, 0.15mm, etc. This is a significant improvement compared to the prior art gap greater than 0.25mm, while also meeting the normal movement requirements of the spring contact pin 301.

[0044] refer to Figure 4 and Figure 5 In some embodiments of the present invention, the end of the needle tube 401 away from the needle head 402 extends out from the first placement slot 102, and the surface of the needle tube 401 away from the needle head 402 is spherical. This spherical surface allows for smoother contact with the earphone, preventing damage to the spring contact pin 301 and the earphone due to harsh edges, and allows for better contact with the earphone to establish electrical conduction. The spherical design also meets aesthetic requirements.

[0045] refer to Figure 3In some embodiments of the present invention, a metal conductive area 302 is provided on the surface of the circuit board 201 on the side facing the spring contact needle 301. The metal conductive area 302 is used to abut against the needle head 402. In the prior art, the spring contact needle 301 is connected to the circuit board 201 by patching the needle tube 401 onto the circuit board 201. However, in the embodiments of the present invention, the needle head 402 directly abuts against the metal conductive area 302 of the circuit board 201, eliminating the need for patching. This simplifies the process and reduces processing costs. Compared to patching, the abutment method does not need to consider patch tolerances. This can reduce the gap between the spring contact needle 301 and the inner wall of the box body 101 after installation, thereby improving the compactness of the structure and the aesthetics of the spring contact needle 301 exposed in the first placement slot 102.

[0046] It should be noted that in some embodiments of the present invention, the metal conductive area 302 can be a copper-plated area or a gold-plated area. Preferably, the embodiment of the present invention uses a gold-plating process. The gold-plated layer has good conductivity and chemical stability, stable contact, and long service life, which can effectively improve the charging performance of the earphone charging box 100.

[0047] refer to Figure 9 In some embodiments of the present invention, the spring 501 is in a compressed state, and the elastic force of the spring 501 is used to drive the needle 402 to abut against the circuit board 201. The compressed state can ensure that the needle 402 and the circuit board 201 are always connected, improve the abutment stability of the needle 402 and the circuit board 201, prevent electrical conduction failures due to shaking during use, and improve the yield rate. It should be noted that Figure 9 as well as Figure 10 The needle head 402 of the spring contact needle 301 is in a fully extended state, and the portion interfering with the circuit board 201 in the figure actually abuts against the circuit board 201 during actual use. The spring 501 is also in a retracted state. The figure is provided to illustrate that the needle head 402 of the spring contact needle 301 is in a maximum extended state.

[0048] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. In addition, the embodiments of the present invention and the features of the embodiments can be combined with each other unless there is a conflict.

Claims

1. Earphone charging box, characterized by: include: A box body, the box body having a first placement groove for placing the earphone, and a through hole is formed in the first placement groove; a circuit board, the circuit board being installed in the box body; a spring contact needle, the spring contact needle being mounted in the housing, the spring contact needle comprising a needle tube, a needle head, and a spring, the spring being disposed in the needle tube, the needle head having a first end and a second end, the first end being connected to the spring and disposed in the needle tube, the second end extending relative to the needle tube; The second end is electrically connected to the circuit board, a portion of the needle tube passes through the through hole, and an end of the needle tube away from the needle head is located in the first placement groove.

2. The earphone charging box according to claim 1, characterized in that: The needle tube includes a main body and a protruding portion connected to each other. The protruding portion surrounds the outer circumference of the main body and protrudes relative to the outer circumference of the main body.

3. The earphone charging box according to claim 2, characterized in that: The protrusion has a first surface and a second surface arranged opposite to each other in the axial direction, and the box body is provided with an abutment surface arranged opposite to the first surface. The distance between the abutment surface and the end of the through hole close to the first placement groove is L1, and the maximum distance between the second surface and the end face of the second end is L2, L1>L2.

4. The earphone charging box according to claim 1, characterized in that: The diameter of the through hole is D1, the diameter of the second end is D2, and the diameter of the end of the needle tube away from the needle head is D3, where D3≤D1<D2.

5. The earphone charging box according to claim 1, characterized in that: The through hole is also connected to a second placement groove for placing the spring contact needle. The needle tube includes a main body and a protrusion connected to each other. The main body includes a first section and a second section distributed along the axial direction. The first section connects the needle head and the second section. The diameter of the second section is smaller than the diameter of the first section to form a stepped surface, and the stepped surface abuts the bottom wall of the second placement groove.

6. The earphone charging box according to claim 5, characterized in that: At least a portion of the first section is located in the second placement groove, and a distance between an outer peripheral surface of the first section and an inner wall surface of the second placement groove is L3, where 0.03 mm ≤ L3 ≤ 0.2 mm.

7. The earphone charging box according to claim 5, characterized in that: At least a portion of the second section is located in the through hole, and a distance between an outer peripheral surface of the second section and an inner wall surface of the through hole is L4, 0<L4≤0.15mm.

8. The earphone charging box according to claim 1, characterized in that: One end of the needle tube away from the needle head extends relative to the first placement groove, and the surface of the end of the needle tube away from the needle head is a spherical surface.

9. The earphone charging box according to claim 1, characterized in that: A metal conductive area is provided on the surface of the circuit board facing the spring contact needle, and the metal conductive area is used to abut against the needle head.

10. The earphone charging box according to claim 1, characterized in that: The spring is in a compressed state, and the elastic force of the spring is used to drive the needle to abut against the circuit board.

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