Fisheye pin

Abstract

The utility model relates to a fisheye pin, which comprises a rod part and a head part, the head part is provided with a guide part, a fisheye part and a shoulder part along the insertion direction of the head part in sequence, the fisheye part comprises two opposite straight arms, the straight arms extend along the insertion direction of the head part, and the two ends of the two straight arms are respectively bent oppositely. And a first folding part connected with the guide part and a second folding part connected with the shoulder part are respectively formed. According to the fisheye pin designed by the utility model, by optimizing the structure and size design, reliable contact pressure can be provided in a limited space, so that the fisheye pin can be more tightly attached to the hole wall of the PCB in the insertion process, stress is effectively dispersed, the problems of connection failure and the like caused by stress concentration are avoided, and the service life of the fisheye pin is prolonged. Therefore, the stability and the reliability of the electric connection between the connector and the PCB jack are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric connectors, in particular to a fisheye pin. Background Art

[0002] In the existing technology, as electronic products develop towards miniaturization and high integration, the design of PCB boards has gradually evolved towards high-density interconnection. Especially in the fields of servers and communication equipment, the demand for electrical connectors is growing. Fisheye pin connectors, as a typical electrical connector, have been widely used in these fields due to their small size and high-density interconnection.

[0003] Traditional fisheye pin connectors rely primarily on elastic deformation, achieving electrical connection through contact between a spring arm and a PCB socket. While this design met connection requirements in the early days, as PCB socket sizes continue to shrink, the traditional design, which relies solely on elastic deformation of the spring arm for electrical connection, has become unstable. Especially in high-density interconnection and micro-sized applications, traditional fisheye pin connectors lack sufficient contact pressure and connection stability, affecting the reliability and long-term performance of the electrical connection. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a fisheye pin with stable connection.

[0005] In order to achieve the above-mentioned purpose, the fisheye pin designed by the present invention includes a rod and a head, and the head is sequentially provided with a guide portion, a fisheye portion and a shoulder along its insertion direction, the fisheye portion includes two opposite straight arms, the straight arms extend along the insertion direction of the head, and the two ends of the two straight arms are bent toward each other to form a first fold portion connecting the guide portion and a second fold portion connecting the shoulder; the straight arms, the first fold portion and the second fold portion together surround an eyelet, the opposite sides of the two straight arms extend toward each other from the two side opening edges of the eyelet to form a first ridge, the opposite sides of the two first fold portions extend toward each other from the two side opening edges of the eyelet to form a second ridge, and the opposite sides of the two second fold portions extend toward each other from the two side opening edges of the eyelet to form a third ridge; the thickness of the first ridge, the second ridge and the third ridge gradually decreases from the outside to the inside along the radial direction of the eyelet; a buffer sheet is provided in the eyelet, the buffer sheet is located in the middle position in the depth direction of the eyelet, and is connected to the first ridge, the second ridge and the third ridge.

[0006] Preferably, the appearance surfaces of the first ridge, the second ridge and the third ridge are all flat surfaces, wherein the appearance surface of the first ridge forms an angle a with the buffer sheet, the appearance surface of the second ridge forms an angle b with the buffer sheet, and the appearance surface of the third ridge forms an angle c with the buffer sheet, and a>c, c=b.

[0007] Preferably, the first convex strip, the second convex strip and the third convex strip all have trapezoidal appearance surfaces.

[0008] Preferably, the thickness of the buffer sheet is 0.1 to 0.2 times the depth of the hole.

[0009] Preferably, a fourth ridge is provided at the connection between the two first folding portions, and the thickness of the fourth ridge gradually decreases from the outside to the inside along the radial direction of the eyelet.

[0010] Preferably, an angle d is formed between the two first folding portions, and the angle d ranges from 23° to 27°; an angle e is formed between the two second folding portions, and the angle e ranges from 30° to 35°.

[0011] Preferably, an angle f is formed between the first folding portion and the straight arm, and the angle f ranges from 162° to 168°; an angle g is formed between the second folding portion and the straight arm, and the angle g ranges from 161° to 163°.

[0012] Preferably, outer edges of the straight arm, the first folding portion and the second folding portion are all rounded.

[0013] Preferably, the connection between the first folding portion and the guide portion is a rounded transition, and the connection between the second folding portion and the shoulder portion is a rounded transition.

[0014] The fisheye pin designed in this utility model can provide reliable contact pressure within a limited space through optimized structure and size design, so that the fisheye pin can fit more closely with the PCB hole wall during insertion, and effectively disperse stress, avoiding problems such as stress concentration leading to connection failure, thereby improving the electrical connection stability and reliability between it and the PCB board socket. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the fisheye pin provided in an embodiment of the present application.

[0016] Figure 2 yes Figure 1 Enlarged schematic diagram of point A in the middle.

[0017] Figure 3 Schematic diagram of the planar structure of the fisheye pin provided in an embodiment of the present application.

[0018] Figure 4 yes Figure 3 Enlarged schematic diagram of point B in the middle.

[0019] Figure 5 yes Figure 4 Cross-sectional view at CC.

[0020] Figure 6 yes Figure 4 Cross-sectional view at DD in the middle.

[0021] Figure 7 yes Figure 4 Cross-sectional view at EE.

[0022] Among them: rod 100, head 200, guide part 10, fisheye part 20, straight arm 21, first fold part 22, second fold part 23, shoulder 30, eyelet 40, first ridge 50, second ridge 60, third ridge 70, buffer sheet 80, fourth ridge 90. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0024] like Figures 1 to 7 As shown, the fisheye pin described in this embodiment comprises a stem 100 and a head 200. The head 200 is sequentially provided with a guide portion 10, a fisheye portion 20, and a shoulder portion 30 along its insertion direction. In this embodiment, the end of the guide portion 10 is tapered to guide the fisheye portion 20 for smooth insertion into the PCB hole. This tapered design reduces insertion resistance and ensures precise alignment, minimizing the risk of misalignment and damage during insertion. The stem 100 and head 200 are integrally formed from a 0.4mm thick metal strip.

[0025] The fisheye portion 20 includes two opposing straight arms 21 extending in the direction of insertion of the head portion 200. The two ends of the straight arms 21 are bent toward each other, forming a first fold 22 connecting to the guide portion 10 and a second fold 23 connecting to the shoulder portion 30, respectively. The straight arms 21, the first fold 22, and the second fold 23 collectively form an eyelet 40. This design imparts excellent elasticity and deformability to the fisheye portion 20. Specifically, the ends of the straight arms 21 are spaced a certain distance apart through the connection of the first fold 22 and the second fold 23 to form the eyelet 40. During insertion into the PCB hole, the first fold 22 provides guidance, causing the straight arms 21 to be compressed by the inner wall of the PCB hole, thereby deforming to a certain extent. This allows the head portion 200 to be smoothly inserted and adapt to the hole wall, providing a reliable electrical connection.

[0026] The opposite sides of the two straight arms 21 extend toward each other from the opening edges on both sides of the eyelet 40 to form a first ridge 50, the opposite sides of the two first folds 22 extend toward each other from the opening edges on both sides of the eyelet 40 to form a second ridge 60, and the opposite sides of the two second folds 23 extend toward each other from the opening edges on both sides of the eyelet 40 to form a third ridge 70; the thickness of the first ridge 50, the second ridge 60 and the third ridge 70 gradually decreases from the outside to the inside along the radial direction of the eyelet 40, which can effectively disperse stress and prevent structural failure caused by stress concentration; a buffer sheet 80 is provided in the eyelet 40, and the buffer sheet 80 is located in the middle position in the depth direction of the eyelet 40, and is connected to the first ridge 50, the second ridge 60 and the third ridge 70. When the fisheye pin is inserted into the PCB hole, the buffer sheet 80 will deform, making the entire fisheye part 20 stronger and reducing the impact of local stress on the material. This controlled deformation effectively avoids excessive stress concentration in a specific area during insertion, thereby preventing possible damage or destruction. After the straight arm 21 is fully inserted into the PCB hole, the buffer sheet 80 will provide a certain contact pressure for the two straight arms 21, thereby significantly improving the stability and reliability of the connection.

[0027] In some embodiments, as Figure 2 、 Figure 5 、 Figure 6 、 Figure 7 As shown, the appearance surfaces of the first ridge 50, the second ridge 60 and the third ridge 70 are all flat surfaces, wherein the appearance surface of the first ridge 50 forms an angle a with the buffer sheet 80, the appearance surface of the second ridge 60 forms an angle b with the buffer sheet 80, and the appearance surface of the third ridge 70 forms an angle c with the buffer sheet 80, and a>c, c=b.

[0028] With this structural design, during the process of inserting the fisheye pin into the PCB hole, stress first acts on the first fold 22, guiding the initial deformation of the buffer sheet 80 through the second ridge 60 and the angle b, thereby providing a larger initial contact pressure to ensure the initial contact between the fisheye pin and the PCB hole wall. As the insertion process progresses, the first ridge 50 and the angle a begin to play a role, further guiding the deformation of the buffer sheet 80. Since the angle a is relatively large, the two first ridges 50 can first contact when the straight arm 21 is deformed to a certain extent, so as to effectively limit the maximum deformation of the buffer sheet 80, thereby avoiding unstable contact caused by excessive deformation. Finally, when the fisheye pin is fully inserted into the PCB hole, the third ridge 70 and the angle b begin to play a role, further limiting the deformation of the buffer sheet 80 and providing additional support force to ensure the long-term stable connection between the fisheye pin and the PCB hole wall.

[0029] In some embodiments, as Figure 2 、 Figure 4As shown, the first ridge 50, the second ridge 60, and the third ridge 70 all have trapezoidal appearances. Specifically, the transition seams between the first and second ridges 50, 60, and between the first and third ridges 50, 70 are not simply perpendicular to the straight arm 21, but rather present an inclined angle. This obliquely extending transition seam design allows the straight arm 21 to deform under stress during insertion of the fisheye pin into the PCB hole. This force is gradually transferred to the buffer sheet 80 through the ridges when the straight arm 21 is deformed. Due to the trapezoidal design and the presence of the oblique transition seams, this design can guide the buffer sheet 80 to deform in a more ideal direction, thereby effectively reducing stress concentration. Specifically, the stress distribution is more uniform, avoiding excessive local pressure, and making the deformation process of the buffer sheet 80 more controlled, effectively improving the durability and long-term stability of the fisheye pin.

[0030] In some embodiments, the thickness of the buffer sheet 80 is 0.1 to 0.2 times the depth of the hole 40. This appropriate thickness ensures that the buffer sheet 80 deforms sufficiently when the fisheye pin is inserted into the PCB hole. The 0.1 to 0.2 times thickness range ensures that the buffer sheet 80 deforms sufficiently to accommodate PCB holes of varying sizes while also ensuring sufficient strength to withstand the stresses of insertion and removal.

[0031] In some embodiments, as Figure 2 、 Figure 4 、 Figure 5 As shown, a fourth ridge 90 is provided at the junction of the two first folds 22. The thickness of the fourth ridge 90 gradually decreases from the outside to the inside along the radial direction of the eyelet 40. Due to the presence of the fourth ridge 90, the junction of the two first folds 22 no longer forms a sharp V-shaped angle, but instead forms a smoother transition area. This structural change effectively disperses stress and avoids stress concentration at the junction, thereby enhancing the overall strength of the first fold 22 and improving its deformation resistance, thereby preventing deformation or even fracture that could be caused by stress concentration.

[0032] In some embodiments, as Figure 4 As shown, the two first folds 22 form an angle d between them, and the angle d ranges from 23° to 27°; the two second folds 23 form an angle e between them, and the angle e ranges from 30° to 35°. The appropriate angle design helps balance the resistance during insertion and removal, ensuring that the fisheye pin establishes reliable contact with the PCB hole wall during initial insertion while preventing excessive insertion resistance or jamming due to an excessively small angle. This improves the operability and convenience of the fisheye pin during use.

[0033] Furthermore, an angle f is formed between the first folding portion 22 and the straight arm 21, and the angle f ranges from 162° to 168°; an angle g is formed between the second folding portion 23 and the straight arm 21, and the angle g ranges from 161° to 163°.

[0034] In some embodiments, as Figure 2 、 Figure 4 As shown, the outer edges of the straight arm 21, first fold 22, and second fold 23 are all chamfered. Sharp corners are stress concentration points that can easily lead to cracks or breakage. Chamfered corners effectively disperse stress, reduce stress concentration, and improve the strength and durability of the fisheye pin. Furthermore, sharp corners can scratch the edge of the PCB hole, especially during insertion and removal. Chamfered corners effectively prevent this and reduce friction with the PCB hole wall, thereby reducing insertion and removal forces and making operation easier.

[0035] In some embodiments, as Figure 2 、 Figure 4 As shown, the connection between the first fold 22 and the guide portion 10 is a rounded transition, and the connection between the second fold 23 and the shoulder 30 is a rounded transition. Similarly, using rounded transitions at the connection points can effectively disperse stress and avoid stress concentration at the connection points, thereby improving the strength and durability of the fisheye pin and preventing cracks or breakage at these critical connection points. The rounded transitions also make the fisheye pin smoother when inserted and removed from the PCB hole, reducing friction and resistance.

[0036] The fisheye pin provided in this embodiment, through optimized structure and size design, can provide reliable contact pressure within a limited space, so that the fisheye pin can achieve a tighter fit with the PCB hole wall during the insertion process, and effectively disperse stress, avoiding problems such as stress concentration leading to connection failure, thereby improving the electrical connection stability and reliability between it and the PCB board socket.

[0037] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", 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.

[0038] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0039] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A fisheye pin, comprising a stem and a head, wherein the head is provided with a guide portion, a fisheye portion and a shoulder portion in sequence along its insertion direction, characterized in that: The fisheye portion includes two opposite straight arms, which extend along the insertion direction of the head, and the two ends of the two straight arms are bent toward each other to form a first folding portion connecting the guide portion and a second folding portion connecting the shoulder portion respectively; the straight arm, the first folding portion and the second folding portion together form an eyelet, and the opposite sides of the two straight arms extend toward each other from the opening edges on both sides of the eyelet to form a first convex strip, the opposite sides of the two first folding portions extend toward each other from the opening edges on both sides of the eyelet to form a second convex strip, and the opposite sides of the two second folding portions extend toward each other from the opening edges on both sides of the eyelet to form a third convex strip; the thickness of the first convex strip, the second convex strip and the third convex strip gradually decrease from the outside to the inside along the radial direction of the eyelet; a buffer sheet is provided in the eyelet, and the buffer sheet is located in the middle position in the depth direction of the eyelet and is connected to the first convex strip, the second convex strip and the third convex strip.

2. The fisheye pin according to claim 1, characterized in that The appearance surfaces of the first ridge, the second ridge and the third ridge are all flat surfaces, wherein the appearance surface of the first ridge forms an angle a with the buffer sheet, the appearance surface of the second ridge forms an angle b with the buffer sheet, and the appearance surface of the third ridge forms an angle c with the buffer sheet, and a>c, c=b.

3. The fisheye pin according to claim 2, characterized in that: The appearance surfaces of the first convex strip, the second convex strip and the third convex strip are all trapezoidal.

4. The fisheye pin according to claim 1, characterized in that The thickness of the buffer sheet is 0.1 to 0.2 times the depth of the hole.

5. The fisheye pin according to claim 1, characterized in that A fourth ridge is provided at the connection of the two first folding portions, and the thickness of the fourth ridge gradually decreases from the outside to the inside along the radial direction of the eyelet.

6. The fisheye pin according to claim 1, characterized in that An angle d is formed between the two first folding portions, and the angle d ranges from 23° to 27°; an angle e is formed between the two second folding portions, and the angle e ranges from 30° to 35°.

7. The fisheye pin according to claim 1, characterized in that An angle f is formed between the first folding portion and the straight arm, and the angle f ranges from 162° to 168°; an angle g is formed between the second folding portion and the straight arm, and the angle g ranges from 161° to 163°.

8. The fisheye pin according to claim 1, characterized in that The outer edges of the straight arm, the first folding portion and the second folding portion are all rounded.

9. The fisheye pin according to claim 1, characterized in that The connection between the first folding portion and the guide portion is a rounded transition, and the connection between the second folding portion and the shoulder portion is a rounded transition.

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