Fisheye terminal

Abstract

The fisheye terminal comprises a rod part and a head part, the head part is sequentially provided with a tip part, a deformation part and a shoulder part along the insertion direction of the head part, the deformation part comprises two elastic arms which are oppositely arranged, and a hole is formed between the two elastic arms; each elastic arm is of an arc-shaped structure formed by splicing a first straight section, a second straight section and a third straight section, and the sides, away from each other, of the two elastic arms are contact surfaces. According to the fisheye terminal designed by the utility model, the sectional arc-shaped elastic arms are adopted, the shape of the contact surface is optimized, and the fillet transition design of key parts is adopted, so that the insertion resistance is obviously reduced, the insertion smoothness is improved, the contact pressure distribution is optimized, and the connection stability and reliability are enhanced. Besides, the design also improves the structural strength and durability, effectively protects the PCB from being scratched and damaged, and enables the PCB to be more suitable for high-density interconnection and micro-size application scenes.

Description

Technical Field

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

[0002] As electronic products evolve toward miniaturization and high integration, and PCBs move toward higher-density interconnection, the demand for electrical connectors, particularly fisheye pin connectors, is increasing. Fisheye pin connectors, with their compact size and high-density interconnection, are widely used in servers, communications equipment, and other fields.

[0003] Traditional fisheye pins primarily achieve electrical connection with PCB sockets through elastic deformation. However, as PCB sockets continue to shrink in size, relying solely on the elastic deformation of the spring arm is no longer sufficient to achieve a stable electrical connection. Furthermore, the structural mechanical properties of the fisheye pin head are poor, making it difficult to adapt to the demands of high-density wiring. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a fisheye terminal with lower insertion resistance, more stable connection performance, higher structural strength and PCB board protection effect.

[0005] In order to achieve the above-mentioned purpose, the fisheye terminal designed in the utility model includes a rod portion and a head portion, and the head portion is sequentially provided with a tip portion, a deformation portion and a shoulder along its insertion direction, and the deformation portion includes two elastic arms arranged opposite to each other, and a hole is formed between the two elastic arms; the elastic arm is an arc-shaped structure formed by splicing a first straight section, a second straight section and a third straight section, and the side of the two elastic arms facing away from each other is a contact surface, and a smooth arc surface spliced ​​between the first straight section and the second straight section and the appearance surface of the second straight section and the third straight section constitutes the contact surface, and the arc surface protrudes in the direction away from the hole; the connection between the contact surface and the tip portion and the shoulder has a smooth transition; a first rounded corner is provided at the transition between the surface of the elastic arm in the thickness direction and the contact surface; a second rounded corner is provided at the transition between the two first straight sections connecting the tip portion and the two third straight sections connecting the shoulder.

[0006] Preferably, the lengths of the first straight section, the second straight section and the third straight section decrease gradually.

[0007] Preferably, the length of the third straight section is 0.4-0.6 times the length of the second straight section, and 0.2-0.4 times the length of the first straight section.

[0008] Preferably, the connection between the second fillet and the eyelet is smoothly transitioned.

[0009] Preferably, the radius of the second fillet is 0.1-0.5 times the thickness of the elastic arm.

[0010] Preferably, the first rounded corners extend to the outer corners of the tip and the shoulder.

[0011] Preferably, a transition portion is convexly provided on the appearance surface of the first straight section constituting the contact surface, and the surface of the transition portion facing away from the first straight section is a curved surface convex toward a direction away from the eyelet.

[0012] The fisheye terminal designed in this utility model significantly reduces insertion resistance and improves insertion smoothness by utilizing segmented, arc-shaped elastic arms, optimizing the contact surface shape, and rounded transitions in key areas. This design also optimizes contact pressure distribution, enhancing connection stability and reliability. Furthermore, this design improves structural strength and durability, effectively protecting PCBs from scratches and damage, making it more suitable for high-density interconnects and small-size applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the structure of the fisheye terminal provided in an embodiment of the present application;

[0014] Figure 2 yes Figure 1 A in the middle is an enlarged schematic diagram;

[0015] Figure 3 yes Figure 1 Top view of .

[0016] Among them: rod 10, head 20, tip 30, shoulder 40, elastic arm 50, first straight section 51, second straight section 52, third straight section 53, eyelet 90, contact surface 60, arc surface 61, first fillet 70, second fillet 80, transition portion 51. DETAILED DESCRIPTION

[0017] 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.

[0018] like Figures 1 to 3 As shown, the fisheye terminal described in this embodiment is primarily used in electronic connectors to establish a reliable electrical connection between a PCB and the connector. By optimizing the structure of the elastic arm 50 and the design of the contact surface 60, the fisheye terminal can effectively reduce insertion resistance, improve connection stability, and avoid damage to the PCB hole, making it particularly suitable for high-density interconnection scenarios.

[0019] Specifically, the fisheye terminal includes a rod 10 and a head 20. The head 20 is provided with a tip 30, a deformation portion and a shoulder 40 in sequence along its insertion direction. The deformation portion includes two elastic arms 50 arranged opposite to each other, and an eyelet 90 is formed between the two elastic arms 50. The tip 30 is located at the front end of the head 20 and first enters the PCB hole during the insertion process, playing a guiding role to ensure that the fisheye terminal can be accurately inserted. The two elastic arms 50 of the deformation portion will undergo elastic deformation during the insertion process to adapt to PCB holes of different sizes and fit tightly with the hole wall to provide reliable contact pressure. The design of the eyelet 90 allows the elastic arm 50 to have a certain deformation space, which can better adapt to the size changes of the hole and enhance the stability of the connection. At the same time, the shoulder 40 is located at the rear end of the head 20. After the fisheye terminal is fully inserted, the shoulder 40 contacts the surface of the PCB board, providing stable support to prevent the fisheye terminal from slipping out or loosening, further enhancing the reliability of the connection. The rod 10 and the head 20 are integrally formed from a metal strip with a thickness of 0.6mm.

[0020] The elastic arm 50 is an arc-shaped structure formed by splicing together a first straight section 51, a second straight section 52, and a third straight section 53. The sides of the two elastic arms 50 facing away from each other form a contact surface 60. A smooth arc surface 61 is formed between the exterior surfaces of the first and second straight sections 51, 52, and between the second and third straight sections 52, 53. This contact surface 60 is convex away from the eyelet 90. The connection between the contact surface 60, the tip 30, and the shoulder 40 is smoothly transitioned. The smooth arc surface 61 forms a continuous, smooth, convex arc surface, or contact surface 60, increasing the contact area and optimizing contact pressure distribution. This avoids pressure concentration at a single point or area, thereby reducing localized stress on the PCB hole wall and minimizing the risk of permanent deformation of the PCB.

[0021] A first rounded corner 70 is formed at the transition between the thickness surface of the elastic arm 50 and the contact surface 60. This design effectively prevents direct contact between sharp edges and the inner wall of the PCB hole, thereby reducing friction and wear. This smooth transition minimizes damage to the inner wall of the PCB hole, particularly during insertion and removal of the fisheye terminal, extending the life of the PCB and improving connection reliability.

[0022] A second rounded corner 80 is provided at the transition between the two first straight sections 51 connecting the tip 30 and the two third straight sections 53 connecting the shoulder 40. This structural design eliminates the need for a V-shaped angle between the two first straight sections 51 and the two third straight sections 53, creating a transitional connection via the second rounded corner 80. This structure effectively disperses stress when the fisheye terminal is inserted into a PCB hole, compressing the first straight sections 51. This prevents stress concentration at the sharp V-shaped angle, thereby improving the elastic arm 50's resistance to deformation and even fracture. Furthermore, the second rounded corner 80 makes insertion and removal of the fisheye terminal smoother, further reducing wear on the PCB.

[0023] In some embodiments, as Figure 2 、 Figure 3 As shown, the lengths of the first straight section 51, the second straight section 52, and the third straight section 53 decrease in length. Specifically, the first straight section 51 is the longest, and its main function is to first enter the PCB hole during insertion and act as a guide. That is, its longer length enables it to better guide the subsequent second straight section 52 into the PCB hole, thereby reducing insertion resistance, improving the smoothness and accuracy of insertion, and effectively avoiding misinsertion or jamming. The length of the second straight section 52 is moderate, so that it can provide a certain amount of deformation to adapt to PCB holes of different sizes and meet the flexibility requirements of the connection without causing unstable connection due to excessive deformation. The third straight section 53 is the shortest, and its main function is to provide additional support and limit the deformation of the second straight section 52. That is, when the fisheye terminal is fully inserted into the PCB hole, the third straight section 53 will contact the hole wall, providing additional support and limiting the deformation of the second straight section 52, avoiding excessive deformation, thereby ensuring the long-term stability of the connection.

[0024] In practice, the length of the third straight section 53 is 0.4-0.6 times the length of the second straight section 52, and 0.2-0.4 times the length of the first straight section 51. This proportional relationship effectively balances the relationship between guidance, deformation, and support, thereby ensuring smooth insertion while providing a stable and reliable connection.

[0025] In some embodiments, the second rounded corner 80 and the eyelet 90 are smoothly connected. The smooth transition eliminates the protrusion between the second rounded corner 80 and the eyelet 90, making it easier for the first straight section 51 to elastically contract when squeezed, without reducing the deformable space due to possible interference from the protruding parts.

[0026] In some embodiments, the radius of the second fillet 80 is 0.1-0.5 times the thickness of the elastic arm 50. This range of fillets can effectively disperse stress and improve strength while ensuring that the elastic arm 50 has sufficient contact area and elastic deformation to ensure the fisheye terminal function is achieved.

[0027] In some embodiments, as Figure 2 、 Figure 3 As shown, the first fillet 70 extends to the outer corners of the tip 30 and shoulder 40. Corners are prone to stress concentration, which can easily lead to cracking or fracture. By extending the first fillet 70 to the outer corners of the tip 30 and shoulder 40, these corners are minimized, making the fisheye terminal smoother when inserted and removed from the PCB hole, reducing insertion resistance and preventing damage to the PCB.

[0028] In some embodiments, as Figure 3 As shown, a transition portion 51 is convexly provided on the exterior surface of the first straight section 51 that forms the contact surface 60. The surface of the transition portion 51 facing away from the first straight section 51 is a curved surface that convexly projects away from the eyelet 90. The curved surface design of the transition portion 51 allows the contact surface 60 to more closely contact the PCB hole wall, thereby achieving more uniform contact pressure distribution, improving smoothness during insertion and removal, and reducing wear on the PCB.

[0029] The fisheye terminal provided in this embodiment significantly reduces insertion resistance and improves insertion smoothness by utilizing segmented, curved elastic arms, optimizing the contact surface shape, and rounded corner transitions at key locations. This design also optimizes contact pressure distribution, enhancing connection stability and reliability. Furthermore, this design improves structural strength and durability, effectively protecting PCBs from scratches and damage, making it more suitable for high-density interconnects and small form factor applications.

[0030] 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.

[0031] 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.

[0032] 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 terminal comprising a rod and a head, wherein the head is provided with a tip portion, a deformation portion and a shoulder portion in sequence along its insertion direction, characterized in that: The deformation portion includes two elastic arms arranged opposite to each other, and an eyelet is formed between the two elastic arms; the elastic arm is an arc-shaped structure formed by splicing a first straight section, a second straight section and a third straight section, and the side of the two elastic arms facing away from each other is a contact surface, and a smooth arc surface spliced ​​between the first straight section and the second straight section and the appearance surface of the second straight section and the third straight section constitutes the contact surface, and the arc surface protrudes in the direction away from the eyelet; the connection between the contact surface and the tip and the shoulder has a smooth transition; a first rounded corner is provided at the transition between the surface in the thickness direction of the elastic arm and the contact surface; a second rounded corner is provided at the transition between the two first straight sections connecting the tip and the two third straight sections connecting the shoulder.

2. The fisheye terminal according to claim 1, characterized in that: The lengths of the first straight section, the second straight section and the third straight section decrease gradually.

3. The fisheye terminal according to claim 2, characterized in that: The length of the third straight section is 0.4-0.6 times the length of the second straight section, and 0.2-0.4 times the length of the first straight section.

4. The fisheye terminal according to claim 1, characterized in that: The connection between the second fillet and the eyelet is smoothly transitioned.

5. The fisheye terminal according to claim 1, wherein: The radius of the second rounded corner is 0.1-0.5 times the thickness of the elastic arm.

6. The fisheye terminal according to claim 1, characterized in that: The first fillet extends to the outer corners of the tip and the shoulder.

7. The fisheye terminal according to claim 1, characterized in that: A transition portion is convexly provided on the appearance surface of the first straight section constituting the contact surface, and a surface of the transition portion facing away from the first straight section is a curved surface convex toward a direction away from the hole.

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