Spring pin, electric connector and electronic equipment

Abstract

The embodiment of the utility model relates to the technical field of electronic products, and discloses a vibrating needle, an electric connector and electronic equipment, and the vibrating needle comprises a needle tube, a needle head and an elastic member. The needle tube comprises a first section and a second section which are integrally connected, and a first clamping part is formed at the joint of the first section and the second section; the radial width of the first section is greater than that of the second section; the needle head sleeves the first section of the needle tube, and the needle tube and the needle head are respectively provided with an accommodating part for partially accommodating the elastic piece, so that the needle head can slide along the length direction of the needle tube; a conductive base is arranged on the second section of the needle tube; a self-riveting structure is arranged on the side surface, close to the lower end part of the needle head, of the conductive base; when the self-riveting structure is assembled, the needle head is pressed to slide in the length direction of the needle tube, the lower end of the needle head abuts against the self-riveting structure and is bent inwards under the guidance of the self-riveting structure, and a second clamping part matched with the first clamping part in a clamping mode is formed. Pollutants can be prevented from entering the needle tube, the bottom can be effectively sealed to prevent pollution, and meanwhile assembly is convenient.

Description

Technical Field

[0001] This utility model relates to the field of electronic product technology, specifically to a spring pin, an electrical connector, and an electronic device. Background Technology

[0002] A spring-loaded pin is a component used to achieve electrical connections, commonly found in electronic devices. In existing technology, the needle tip is generally partially housed inside the needle tube and partially exposed on the outside. When subjected to external force, the needle tip can slide up and down along the needle tube inside the tube.

[0003] However, because the needle is located inside the syringe tube, its radial width is smaller than that of the syringe tube. Since the needle is exposed, external contaminants such as water and oil can easily seep into the syringe tube through the gap between the needle and the tube, causing corrosion and other damage to the inner wall of the syringe tube, thus affecting the electrical performance of the spring needle. Furthermore, existing spring needles require specialized tools for assembly, making assembly inconvenient. Therefore, there is an urgent need for a spring needle with good airtightness and easy assembly. Summary of the Invention

[0004] In view of the above problems, this utility model provides a spring pin, an electrical connector and an electronic device to solve the problem that the prior art cannot simultaneously prevent contaminants from entering.

[0005] According to one aspect of the present invention, a spring needle is provided, the spring needle comprising: a needle tube, a needle tip, and an elastic element;

[0006] The needle tube includes a first segment and a second segment integrally connected, and a first engaging portion is formed at the connection between the first segment and the second segment; the radial width of the first segment is greater than the radial width of the second segment.

[0007] The needle tip is sleeved on the first section of the needle tube, and the needle tube and the needle tip are respectively provided with receiving portions for partially accommodating the elastic element, so that the needle tip can slide along the length direction of the needle tube;

[0008] A conductive base is provided on the second section of the needle tube, and a self-riveting structure is provided on the side of the conductive base near the lower end of the needle tip.

[0009] The self-rivet structure is used so that during assembly, the needle tip is pressed and slides along the length of the needle tube, the lower end of the needle tip abuts against the self-rivet structure, and bends inward under the guidance of the self-rivet structure to form a second engaging part that engages with the first engaging part.

[0010] In one alternative embodiment, the self-rivet structure is a tapered guide surface or guide ramp formed on the conductive base, and the lower end of the needle is squeezed and bent inward as it slides along the tapered guide surface or guide ramp.

[0011] In one alternative embodiment, a groove is provided on the upper end face of the conductive base; the groove wall away from the second section is a guide slope or a conical guide surface, and the vertical distance from the guide slope or conical guide surface to the second section gradually decreases from the groove opening to the groove bottom.

[0012] In one alternative embodiment, the needle includes a needle body and a lower end portion; the sidewall thickness of the needle body is greater than the sidewall thickness of the lower end portion of the needle.

[0013] In one alternative approach, the sidewall thickness of the needle body is twice the sidewall thickness of the lower end of the needle.

[0014] In one alternative embodiment, the first engaging portion is a stepped surface or annular shoulder formed at the connection between the first and second segments of the needle tube; the second engaging portion is an annular flange or one or more local protrusions formed by bending the lower end of the needle inward.

[0015] In one alternative embodiment, when the needle is not subjected to external force, the first engaging portion and the second engaging portion engage under the elastic force of the elastic member, and the lower end of the needle remains spaced from the self-riveting structure.

[0016] In one alternative embodiment, the elastic element is a helical spring, a wave spring, or a sheet spring.

[0017] According to another aspect of the present invention, an electrical connector is provided, the electrical connector including the aforementioned spring pin, the conductive base of the spring pin being used for electrical connection with a circuit board.

[0018] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising: a fixing structure, a circuit board and the aforementioned spring pin;

[0019] The bottom end of the conductive base of the spring pin is electrically connected to the circuit board; the outer edge of the conductive base is fixed to the fixed structure.

[0020] This utility model embodiment of the spring needle includes a needle tube, a needle tip, and an elastic element. The needle tube includes a first section and a second section integrally connected, and a first engaging portion is formed at the connection between the first section and the second section; the radial width of the first section is greater than the radial width of the second section; the needle tip is sleeved on the first section of the needle tube, and the needle tube and the needle tip are respectively provided with receiving portions for partially accommodating the elastic element, allowing the needle tip to slide along the length direction of the needle tube; a conductive base is provided on the second section of the needle tube, and a self-riveting structure is provided on the side of the conductive base near the lower end of the needle tip; the self-riveting structure is used so that during assembly, the needle tip is pressed and slides along the length direction of the needle tube, the lower end of the needle tip abuts against the self-riveting structure, and bends inward under the guidance of the self-riveting structure to form a second engaging portion that engages with the first engaging portion. By providing a self-riveting structure on the conductive base, the spring needle can both prevent contaminants from entering the needle tube and effectively seal and prevent contamination at the bottom, while also facilitating assembly.

[0021] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0023] Figure 1 A front structural diagram of the spring pin provided in Embodiment 1 of this utility model is shown;

[0024] Figure 2 A cross-sectional view of the spring pin provided in Embodiment 1 of this utility model is shown;

[0025] Figure 3 It shows Figure 2 Enlarged structural diagram at point B;

[0026] Figure 4 This shows a cross-sectional structural diagram of the spring pin before assembly in Embodiment 1 of this utility model;

[0027] Figure 5 It shows Figure 4 Enlarged structural diagram at point B;

[0028] Figure 6A schematic diagram of the spring pin assembly process of Embodiment 1 of this utility model is shown.

[0029] The reference numerals in the detailed embodiments are as follows:

[0030] Needle 100, needle connecting wall 110, second engaging part 130, assembly surface 1102, upper end of needle 120, needle tube 200, first section 210, first engaging part 2110, second section 220, conductive base 230, groove 240, self-rivet structure 2401, elastic element 300. Detailed Implementation

[0031] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0032] First, the prior art of this application will be further described. Because the needle is located inside the needle tube, contaminants can easily flow into the needle tube through the gap between the needle and the tube, causing corrosion and other effects on the inner wall of the needle tube, thus affecting the electrical performance of the spring needle. Therefore, the inventors of this application considered that the needle could be fitted onto the needle tube, making the radial width of the needle greater than the width of the needle tube, to prevent contaminants from entering the needle tube. Considering that the spring needle is generally located in the fixed structure of electronic devices, including an assembly hole, with the lower end of the needle tube located within this assembly hole, the structure of the lower end of the existing needle tube is similar to its radial width, both being relatively small. When the lower end of the needle tube is connected to the fixed structure of the electronic device, it is impossible to seal the two using adhesives or other processes, thus easily creating gaps. Contaminants can still enter the assembly hole through these gaps and further into the circuit board, causing contamination. Therefore, the inventors considered providing a conductive base with a larger radial width at the lower end of the needle tube, allowing for the installation of sealing components such as sealing rings on the conductive base or integral molding with the fixed structure for sealing, thereby improving airtightness. However, this design renders existing syringe and needle assembly methods unsuitable and inconvenient. Considering these factors, this invention provides a spring-loaded needle that allows for easy assembly while preventing contamination from entering the syringe from above and effectively sealing it from below. Example 1:

[0033] Please see Figure 1 , Figure 1A schematic diagram of an embodiment of the spring-loaded needle of this utility model is shown. The spring-loaded needle includes: a needle tube 200, a needle tip 100, and an elastic element 300. The needle tube 200 is sleeved on one end of the needle tip 100, and the needle tip 100 can slide along the length of the needle tube 200 via the elastic element 300. The end of the needle tip 100 that slides with the needle tube 200 is circular, elliptical, or polygonal, etc., and this embodiment of the invention does not impose specific limitations.

[0034] Please refer to Figure 2 In this embodiment, the needle tube 200 is a cylindrical tube open at one end. The needle tube 200 includes a first segment 210 and a second segment 220 integrally connected, and a first engaging portion 2110 is formed at the connection between the first segment 210 and the second segment 220. The radial width of the first segment 210 is greater than the radial width of the second segment 220. The first engaging portion 2110 can be a stepped surface or an annular shoulder formed at the connection between the first and second segments of the needle tube. Figure 3 As shown, the first engaging part 2110 is an inclined stepped surface.

[0035] The needle 100 is fitted onto the first section 210 of the needle tube 200, and both the needle tube 200 and the needle 100 are provided with receiving portions for partially accommodating the elastic member 300, allowing the needle 100 to slide along the length of the needle tube 200. Figure 2As shown, the receiving portion of the needle tube 200 is disposed in the first segment 210, and the upper end of the first segment 210 is an open structure. The needle 100 includes a needle body and a lower end, wherein the needle body is a cylindrical structure with an open lower end, the upper end of the cylindrical structure is the upper end of the needle 120, the cylindrical wall of the cylindrical structure is the needle connecting wall 110, and the lower end of the needle 100 is the lower edge region of the needle connecting wall 110. The receiving portion of the needle 100 is connected to its lower end opening. The elastic member 300 is placed in the receiving portion of the needle 100 through the lower end opening and abuts or is fixedly connected to the bottom end of the receiving portion. Another part of the elastic member 300 passes through the opening of the first segment 210 and is received in the receiving portion of the needle tube 200, and abuts or is fixedly connected to the bottom end of the receiving portion. The needle 100 and the needle tube 200 are made of conductive material, such as copper foil or gold-plated copper foil, etc., and this embodiment of the utility model does not impose specific limitations. In this embodiment, the elastic element 300 can be an elastic structure such as a helical spring, wave spring, or spring sheet; no specific limitation is made in this embodiment. Since the needle 100 is sleeved on the first segment 210, the radial width of the needle 100 must be greater than the radial width of the first segment 210. In this embodiment, the inner wall of the needle connecting wall 110 is in contact with the outer wall of the first segment 210, so that during the downward sliding of the needle 100 along the length of the needle tube 200 under external force, the inner wall of the needle connecting wall 110 is at least partially in contact with the outer wall of the first segment 210, thereby ensuring that the needle 100 maintains electrical connection with the first segment 210 throughout its downward movement. To ensure that the two remain in contact for electrical connection and to facilitate assembly, the gap between the inner wall of the needle connecting wall 110 and the outer wall of the first segment 210 in this embodiment can be 0.01-0.02 mm. Figure 3 As shown, the lower edge of the needle connecting wall 110 of the needle 100 is the second engaging portion 130. The second engaging portion 130 can be an annular flange or one or more partial protrusions that mate with the first engaging portion 2110. When the needle is not subjected to external pressure, the elastic member 300 is in an undeformed or slightly compressed state, and the first engaging portion 2110 engages with the second engaging portion 130. Through the above arrangement, when the needle is subjected to external pressure, the needle 100 compresses the elastic member 300 downwards, the elastic member 300 is in a compressed state, the needle 100 moves along the length of the needle tube 200, and the first engaging portion 2110 separates from the second engaging portion 130; when the external pressure disappears, the elastic member 300 applies an upward elastic force to the needle 100, causing the needle 100 to slide upwards until the first engaging portion 2110 engages with the second engaging portion 130, thereby allowing the needle 100 to reciprocate along the needle tube 200.

[0036] The needle tube 200 has a conductive base 230 on its second segment 220. Specifically, the conductive base 230 is located at the lower end of the second segment 220. The bottom end of the conductive base 230 is electrically connected to the circuit board. The side of the conductive base 230 is used to connect to the fixing structure of the electronic device. To ensure better sealing when the conductive base 230 is connected to the fixing structure of the electronic device, considering the manufacturing process, in this embodiment, the radial width of the conductive base 230 is set to be greater than the radial width of the second segment 220 of the needle tube 200. This facilitates the setting of a sealing ring around the conductive base 230 or allows the conductive base 230 to be integrally formed with the fixing structure, thereby achieving better anti-fouling performance.

[0037] Because the conductive base 230 has a large radial width, the existing method of using a jig to clamp the lower end of the needle 100 to engage it with the needle tube 200 is no longer applicable when assembling the needle 100 onto the needle tube 200. Therefore, in this embodiment, the conductive base 230 is provided with a self-rivet structure 2401 on the side near the lower end of the needle 200. The self-rivet structure 2401 is used so that during assembly, the needle 100 is pressed and slides along the length of the needle tube 200, the lower end of the needle 100 abuts against the self-rivet structure 2401, and bends inward under the guidance of the self-rivet structure 2401 to form a second engaging portion 130 that engages with the first engaging portion 2110. When the needle 100 is not subjected to external force, under the elastic force of the elastic member 300, the first engaging part 2110 and the second engaging part 130 engage and cooperate, and the lower end of the needle 100 is kept at a distance from the self-riveting structure 2401.

[0038] Specifically, the self-rivet structure 2401 is a conical surface or inclined surface formed on the conductive base. The lower end of the needle 100 is compressed and bent inwards when sliding along the conical surface or inclined surface. In one specific implementation, a groove 240 is provided on the upper surface of the conductive base 230. This groove 240 is a groove-shaped structure surrounding the lower end of the second segment 220, including a groove wall near the second segment, a groove bottom, and a groove wall away from the second segment 240. The groove wall away from the second segment 240 is an inclined surface or a conical surface, thus forming the self-rivet structure 2401. The vertical distance from the inclined surface or conical surface to the second segment 220 gradually decreases from the groove opening to the groove bottom; that is, the inclined surface or conical surface is an outwardly inclined guiding surface, forming a conical guiding surface or guiding inclined surface, thereby causing the lower end of the needle 100 to be compressed and bent inwards when sliding along the conical guiding surface or guiding inclined surface. Wherein, as Figure 4 As shown, when the needle 100 is assembled onto the needle 200, in the initial state, the lower end of the needle 100 is an edge structure formed by the downward extension of the needle connecting wall 110. Figure 5As shown in the enlarged schematic diagram, the sidewall thickness of the needle connecting wall 110 of the needle body is greater than the sidewall thickness of the lower end of the needle 100, thus making the lower end easier to bend and shape during processing. The sidewall thickness of the needle body can be twice the sidewall thickness of the lower end of the needle. In one specific implementation, the thickness of the needle connecting wall 110 is between 0.12 and 0.14 mm. Due to the small shape of the needle, to prevent deformation of the needle due to external forces between the various needle parts during transportation before assembly, the sidewall thickness of the lower end of the needle is set to between 0.06 and 0.07 mm. This thickness ensures that the lower end of the needle 100 will not deform due to external forces such as friction and compression between parts during transportation, while also ensuring that the lower end of the needle 100 can be easily bent to form the second engaging portion 130 during assembly. To facilitate inward bending of the lower end of the needle 100 during assembly, this embodiment aligns the inner wall of the lower end of the needle 100 with the inner wall of the needle connecting wall 110, while the outer wall 1101 of the lower end is inclined. This design makes it easier to bend inward under pressure from the self-rivet structure 2401. Furthermore, the inner wall of the lower end of the needle 100 is provided with a mounting surface 1102, which facilitates the fitting of the first segment 210 of the needle tube 200 into the needle 100.

[0039] To facilitate assembly, the lower end of the needle 100 may have one or more notches, which are used to guide and promote directional bending of the lower end under pressure to form the second engaging portion 130.

[0040] like Figure 6The diagram illustrates the assembly process of the needle 100 onto the needle tube 200. When the needle 100 is pressed and slides along its length, the elastic element 300 is compressed. The needle 100 moves along the length of the needle tube 200, and its lower end abuts against the self-rivet structure 2401, causing the lower end to bend inward. Upon further pressing, a second engaging portion 130 is formed, engaging with the first engaging portion 2110. When released, the elastic element 300 applies an upward elastic force to the needle 100, causing it to slide upward until the first engaging portion 2110 engages with the second engaging portion 130, thus completing the assembly. The self-rivet structure 2401 has a guide slope, and the initial axial distance between the lower end of the needle 100 and the uppermost point of the guide slope is defined as H1. When the downward displacement of the needle 100 is less than H1, its lower end does not contact the guide slope or only initially contacts it; this stage is the free stroke. When the downward displacement of the needle 100 reaches and exceeds H1, its lower end slides along the guide slope and continuously bends inward; this stage is the bending stroke. The axial length L of the bending stroke is defined by the vertical height of the guide slope. At the end of the bending stroke, the outermost edge of the second engaging portion 130 formed at the lower end of the needle 100 displaces radially inward by a distance D1. The first engaging portion 2110 on the needle tube 100 has a step surface for engaging that protrudes radially by a distance D2. Wherein, D1>D2, to ensure that under the restoring force of the elastic member 300, the second engaging portion 130 forms an abutment lock with the lower surface of the first engaging portion 2110 in the axial direction.

[0041] The spring needle of this utility model embodiment includes a needle tube 200, a needle tip 100, and an elastic element 300. The needle tube 200 includes a first segment 210 and a second segment 220 integrally connected, and a first engaging portion 130 is formed at the connection between the first segment 210 and the second segment 220; the radial width of the first segment 210 is greater than the radial width of the second segment 220; the needle tip 100 is sleeved on the first segment 210 of the needle tube 200, and the needle tube 200 and the needle tip 100 are respectively provided with receiving portions for partially accommodating the elastic element 300, so that the needle tip 100 can slide along the length direction of the needle tube 200; A conductive base 230 is provided on the second section 220 of the needle tube 200. A self-rivet structure 2401 is provided on the side of the conductive base 230 near the lower end of the needle tip 100. During assembly, the self-rivet structure 2401 allows the needle tip 100 to slide along the length of the needle tube 200 under pressure. The lower end of the needle tip 100 abuts against the self-rivet structure 2401 and bends inward under its guidance, forming a second engaging portion 130 that engages with the first engaging portion 2110. By providing the self-rivet structure 2401 on the conductive base 230, the spring needle can both prevent contaminants from entering the needle tube 200 and effectively seal the bottom to prevent contamination, while also facilitating assembly. Example 2:

[0042] In another aspect of this utility model embodiment, an electrical connector is also provided, which includes a spring pin as described in the foregoing embodiment. The structure of the spring pin is largely consistent with that of the foregoing embodiment and will not be described again here. The bottom end of the conductive base 230 of the spring pin is used for electrical connection with a circuit board. The side of the conductive base 230 is used for connection with the fixing structure of the electronic device via a sealing ring or integrally molded plastic. Example 3:

[0043] According to another aspect of the present invention, an electronic device is provided, comprising: a fixing structure, a circuit board, and the aforementioned spring pin. The structure of the spring pin is largely consistent with the aforementioned embodiments, and will not be described again here.

[0044] The bottom end of the conductive base 230 of the spring pin is electrically connected to the circuit board; the outer edge of the conductive base is fixed to the fixing structure. The side of the conductive base 230 can be connected to the fixing structure of the electronic device via a sealing ring or integrally molded plastic.

[0045] The electronic device can be a charging device for low-current products, such as a Bluetooth headset charging case, a phone watch charger, or a charging case for smart wearable devices. This embodiment does not impose any specific limitations.

[0046] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this utility model should have the ordinary meaning understood by those skilled in the art to which the embodiments of this utility model pertain.

[0047] In the description of this embodiment of the present invention, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0048] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0049] In the description of this embodiment of the invention, unless otherwise explicitly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0050] In the description of this embodiment of the invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A spring needle, characterized in that, The spring needle includes a needle tube, a needle tip, and an elastic element; The needle tube includes a first segment and a second segment integrally connected, and a first engaging portion is formed at the connection between the first segment and the second segment; the radial width of the first segment is greater than the radial width of the second segment. The needle tip is sleeved on the first section of the needle tube, and the needle tube and the needle tip are respectively provided with receiving portions for partially accommodating the elastic element, so that the needle tip can slide along the length direction of the needle tube; A conductive base is provided on the second section of the needle tube, and a self-riveting structure is provided on the side of the conductive base near the lower end of the needle tip. The self-rivet structure is used so that when the needle is assembled into the needle tube, the needle slides along the length of the needle tube under pressure, the lower end of the needle abuts against the self-rivet structure, and bends inward under the guidance of the self-rivet structure to form a second engaging part that engages with the first engaging part.

2. The spring pin according to claim 1, characterized in that, The self-riveting structure is a tapered guide surface or guide slope formed on the conductive base. The lower end of the needle is squeezed and bent inward when sliding along the tapered guide surface or guide slope.

3. The bullet according to claim 2, wherein A groove is provided on the upper end face of the conductive base; the groove wall away from the second section is a guide slope or a conical guide surface, and the vertical distance from the guide slope or conical guide surface to the second section gradually decreases from the groove opening to the groove bottom.

4. The dart of claim 3 wherein, The needle includes a needle body and a lower end; the sidewall thickness of the needle body is greater than the sidewall thickness of the lower end of the needle.

5. The dart of claim 3 wherein, The sidewall thickness of the needle body is twice the sidewall thickness of the lower end of the needle.

6. The dart of claim 1 wherein, The first engaging portion is a stepped surface or annular shoulder formed at the connection between the first and second sections of the needle tube; the second engaging portion is an annular flange or one or more local protrusions formed after the lower end of the needle tip is bent inward.

7. The dart of any of claims 1-6, wherein, When the needle is not subjected to external force, under the elastic force of the elastic member, the first engaging part and the second engaging part engage and cooperate, and the lower end of the needle remains spaced from the self-riveting structure.

8. The dart of any of claims 1-6, wherein, The elastic element is a helical spring, a wave spring, or a spring sheet.

9. An electrical connector, characterized by The electrical connector includes a spring pin as described in any one of claims 1-8, wherein the conductive base of the spring pin is used for electrical connection with the circuit board.

10. An electronic device, comprising: The electronic device includes: a fixing structure, a circuit board, and a spring pin as described in any one of claims 1-8; The bottom end of the conductive base of the spring pin is electrically connected to the circuit board; the outer edge of the conductive base is fixed to the fixed structure.

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