A fisheye terminal

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By designing fisheye-shaped holes and elastic arm structures for fisheye terminals, the problem of unstable connection of crimp terminals under high temperature and vibration environments was solved, achieving a highly reliable and long-life electrical connection.

CN224537390UActive Publication Date: 2026-07-21NINGBO TIANLONG ELECTRONICS

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: NINGBO TIANLONG ELECTRONICS
Filing Date: 2025-08-06
Publication Date: 2026-07-21

AI Technical Summary

Technical Problem

Existing crimp terminals are difficult to maintain a stable connection under high temperature and vibration environments, and are prone to falling off or poor contact, which affects the reliability of the circuit system.

Method used

A fisheye terminal is designed, which adopts a fisheye-shaped hole and an elastic arm structure. The elastic arm widens from the top and then narrows again in the middle to increase the contact area. The rounded corners and smooth surface prevent scratches. The elastic force distribution is optimized by combining the gradually expanding structure to achieve low insertion force and high retention force.

Benefits of technology

It improves the contact stability and shock resistance of terminals and PCB holes, reduces damage to the electroplating layer of PCB holes, extends product life and improves assembly efficiency.

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Abstract

The utility model discloses a fish eye terminal, including the terminal main part, the fish eye shape hole is set up on the terminal main part, the terminal main part forms the elastic arm in fish eye shape hole both sides, and the first end between two elastic arms integrally connects and forms the end, and the second end between two elastic arms integrally connects and forms the root, the thickness of elastic arm from the first end to the second end of fish eye shape hole is from narrow to wide again narrow. The second end of two elastic arms is integrally formed through the lower connecting member, and the root is connected through the lower connecting member. The arc recess is equipped with inwards in the both sides of lower connecting member. In order to make the process that the press-in type connecting terminal is pressed into the board hole of PCB not to break, the lower connecting member needs to have stronger anti-breaking property, and the left and right sides of lower connecting member and the top end face of terminal root natural transition, namely, the width of lower connecting member and terminal root connecting place is increased, and the probability of vibration fatigue fracture can be reduced.

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Description

Technical Field

[0001] This utility model belongs to the field of fisheye terminal technology, and specifically relates to a fisheye terminal. Background Technology

[0002] The main function of existing crimp terminals is to utilize a hollow structure similar to a pinhole. The terminal is made of a conductive metal material, and the inner wall of the PCB hole is also made of one or more layers of conductive material. When the terminal mates with the PCB hole, the crimp terminal undergoes a combination of elastic and plastic deformation, thereby establishing an electrical connection between the crimp terminal and the PCB's internal control. The PCB's internal hole then connects to the circuitry on the PCB, thus achieving an electrical connection between the conductive terminal and the PCB's circuitry, enabling the connection of power or electrical signals between the terminal and the PCB. However, existing connectors generally cannot simultaneously meet all the above requirements, with performance defects being particularly prominent in high-temperature environments: after prolonged high-temperature operation, most products experience stress relaxation at the contact area with the PCB hole, leading to a decrease in holding force. For example, circuit boards used in automobiles are constantly exposed to vibration during vehicle operation. When the holding force is insufficient, the crimped connector is prone to detachment or poor contact during vibration, directly affecting the reliability of the circuit system. Therefore, obtaining a reliable fisheye terminal is crucial. Utility Model Content

[0003] To solve at least one of the above-mentioned technical problems, this utility model provides a fisheye terminal, including a terminal body, a fisheye-shaped hole on the terminal body, elastic arms formed on both sides of the fisheye-shaped hole, an end portion formed by integrally connecting the first ends of the two elastic arms, and a root portion formed by integrally connecting the second ends of the two elastic arms; the thickness of the elastic arm from the first end to the second end of the fisheye-shaped hole gradually increases from narrow to wide and then narrows again.

[0004] The first ends of the two elastic arms are integrally formed by an upper connecting member, which connects the ends. All edge corners are rounded with a radius of 0.125 mm. The outer walls on both sides of the upper connecting member are rounded to connect the elastic arms and the ends.

[0005] The second ends of the two elastic arms are integrally formed by the lower connecting member and connected to the root through the lower connecting member. The lower connecting member has inwardly curved grooves on both sides. To prevent the press-fit terminal from breaking during the pressing process into the PCB board hole, the lower connecting member needs to have strong fracture resistance. The left and right sides of the lower connecting member naturally transition to the top surface of the terminal root, thus increasing the width of the connection between the lower connecting member and the terminal root, which reduces the probability of vibration fatigue fracture.

[0006] The fisheye-shaped hole includes two symmetrical partial fan-shaped sections and an arc-shaped surface connecting the two symmetrical partial fan-shaped sections.

[0007] The width of the root is greater than the width between the outer walls of the two elastic arms. The root covers the entire hole to provide a limiting function, preventing the PCB board from being broken during pressing and extending product life.

[0008] The outer wall of the elastic arm has an arc-shaped transition; the middle part of the elastic arm is flat. The upper and lower arc-shaped outer walls reduce the pressing resistance and avoid scratching the coating; the middle flat contact: the middle flat outer wall forms a surface contact with the plate hole surface, the contact area is larger than that of the traditional arc structure, the pull-out friction is improved, and the seismic stability is significantly enhanced.

[0009] The plane in the middle of the elastic arm contacts the hole surface of the plate, increasing the effective contact area and improving conductivity reliability.

[0010] The end cap has a square structure at the top, with a 0.3mm guide chamfer around the top edge to ensure the top width is smaller than the radius of the hole in the board to be inserted. This achieves two main functions: automatic guidance: guiding the terminal to align with the board hole during the pressing process, improving assembly efficiency; Adjustable height: The straight-body design allows customers to adjust the PCB board mounting height according to their needs, adapting to various application scenarios.

[0011] The gradually expanding structure of the fish-eye-shaped hole and the spindle-shaped contour of the elastic arm optimize the elastic force distribution and achieve a balance between "low insertion force and high holding force".

[0012] Compared with the prior art, the advantages of this utility model are as follows: This utility model has a simple structure. When the press-fit connector is pressed into the hole of the PCB board, the elastic arm will deform. Since the elastic arm starts to widen from the top and then narrows to the bottom after reaching the middle, that is, the width of the middle part of the elastic arm is the largest. Therefore, by increasing the height of this part in the vertical direction, the contact area between the press-fit connector and the hole of the PCB board can be greatly increased, which can increase the friction when pulling out, and thus improve the contact stability and shock resistance between the press-fit connector and the hole of the PCB board.

[0013] Because the outer walls of the flexible arms are smooth, and the edges of the terminal top 1 and the flexible arm 21 that contact the PCB board holes are rounded, there are no sharp edges. This effectively avoids scratching the phosphor bronze plating layer inside the PCB board holes, thus minimizing damage to the PCB board hole plating layer and improving the service life of the PCB board holes. The presence of the fisheye-shaped hole facilitates the contraction and retraction of the two flexible arms, thereby increasing the pressing and pulling force of this press-fit connector terminal.

[0014] Based on the above-mentioned fisheye terminal, the following method can be adopted: 1. The middle part of the elastic arm is a plane, and several wedge-shaped grooves are opened on the plane to increase friction and achieve stable installation.

[0015] 2. The two elastic arms protrude to the left and right sides, and the two elastic arms protrude in a staggered manner along the front and rear sides, which facilitates the stable connection of at least two sides of the four sides inside the plate hole. 3. An auxiliary elastic arm is integrally formed on the outer side of the elastic arm. The middle of the elastic arm can be longitudinally cut, but not completely severed, thus dividing the elastic arm into an outer elastic arm and an inner elastic arm. The outer elastic arm and the inner elastic arm have an angle between them. When inserted into a narrow plate hole, the outer elastic arm can further contract, increasing conductivity and installation stability. Attached Figure Description

[0016] Figure 1 This is a perspective view of the fisheye terminal of this utility model; Figure 2 This is a front view of the fisheye terminal of this utility model; Figure 3 This is a schematic diagram of one embodiment of the present utility model; Figure 4 This is a schematic diagram of the structure of a second embodiment of the present utility model; Figure 5 This is a schematic diagram of the structure of a third embodiment of the present utility model; Figure label: 1. End; 21. Elastic arm; 211. Upper narrow section; 212. Middle wide section; 213. Lower narrow section; 214. Side wall arc surface; 215. Plane; 216. Rounded corner; 22. Fish-eye shaped hole; 221. Partial fan shape; 222. Arc surface; 3. Root; 5. Upper connecting member; 6. Lower connecting member; 61. Natural transition; 7. Wedge-shaped groove; 8. Attached elastic arm. Detailed Implementation

[0017] To enable those skilled in the art to better understand this utility model and to more clearly define the scope of protection claimed by this utility model, the present utility model is described in detail below with reference to certain specific embodiments. It should be noted that the following are only some specific embodiments of the present utility model concept, and are only a part of the embodiments of this utility model. The specific and direct description of related structures is only for the convenience of understanding this utility model, and the specific features do not necessarily or directly limit the scope of implementation of this utility model.

[0018] Referring to the accompanying drawings, this utility model provides a fisheye terminal, comprising a terminal body with a fisheye-shaped hole 22. Elastic arms 21 are formed on both sides of the terminal body around the fisheye-shaped hole 22. An end portion 1 is integrally connected between the first ends of the two elastic arms 21, and a root portion 3 is integrally connected between the second ends of the two elastic arms 21. The thickness of the elastic arm 21 gradually increases from narrow to wide and then narrows again from the first end to the second end of the fisheye-shaped hole 22. Specifically, the elastic arm 21 includes an upper narrow portion 211, a lower narrow portion 213, and a middle wide portion 212. The outer sidewalls of the upper narrow portion 211 and the lower narrow portion 213 are arc-shaped sidewall surfaces 214, and the side surface of the middle wide portion 212 is a flat surface 215. The first ends of the two elastic arms 21 are integrally formed by the upper connecting member 5, and are connected to the end 1 by the upper connecting member 5. The edge corners are all rounded 216 with a radius of 0.125mm. The outer walls on both sides of the upper connecting member 5 are rounded to connect the elastic arms 21 and the end 1.

[0019] The second ends of the two elastic arms 21 are integrally formed by the lower connecting member 6, which connects to the root 3. The lower connecting member 6 has inwardly curved grooves on both sides. To prevent breakage during the pressing of the press-fit terminal into the PCB board hole, the lower connecting member 6 needs to have strong breakage resistance. The left and right sides of the lower connecting member 6 naturally transition 61 to the top surface of the terminal root 3, thus increasing the width of the connection between the lower connecting member 6 and the terminal root 3, reducing the probability of vibration fatigue fracture.

[0020] The fisheye-shaped hole 22 includes two symmetrical partial fan-shaped sections 221 and an arc-shaped surface 222 connecting the two symmetrical partial fan-shaped sections 221.

[0021] The width of the root portion 3 is greater than the width between the outer walls of the two elastic arms 21. The root portion 3 covers the entire board hole to achieve a limiting function, preventing the PCB board from being broken during pressing and extending the product life.

[0022] The outer wall of the elastic arm 21 has an arc-shaped surface 222 for transition; the middle part of the elastic arm 21 is a plane 215. The upper and lower arc-shaped outer walls reduce the pressing resistance and avoid scratching the coating; the middle plane contact: the middle plane outer wall forms a surface contact with the plate hole surface, the contact area is larger than that of the traditional arc structure, the pull-out friction is improved, and the seismic stability is significantly enhanced.

[0023] The middle plane 215 of the elastic arm 21 contacts the plate hole surface, increasing the effective contact area and improving the conductivity reliability.

[0024] The end portion 1 has a square structure at its top, with a 0.3mm guide chamfer around the top edge to ensure that the top width is smaller than the radius of the hole in the board to be inserted. This achieves two main functions: automatic guidance: guiding the terminal to align with the board hole during the pressing process, thus improving assembly efficiency; Adjustable height: The straight-body design allows customers to adjust the PCB board mounting height according to their needs, adapting to various application scenarios.

[0025] The gradually expanding structure of the fish-eye-shaped hole and the spindle-shaped profile of the elastic arm 21 optimize the elastic force distribution and achieve a balance of "low insertion force and high holding force".

[0026] Compared with the prior art, the advantages of this utility model are as follows: This utility model has a simple structure. When the press-fit connector is pressed into the hole of the PCB board, the elastic arm 21 will deform. Since the elastic arm 21 starts from narrow to wide at its top and then narrows to the bottom after reaching the middle, that is, the width of the middle part of the elastic arm 21 is the largest. Therefore, by increasing the height of this part in the vertical direction, the contact area between the press-fit connector and the hole of the PCB board can be greatly increased, which can increase the friction when pulling out, and thus improve the contact stability and shock resistance stability between the press-fit connector and the hole of the PCB board.

[0027] Because the outer walls of the elastic arms 21 in the left and right directions are smooth surfaces, and the edges of the terminal top 1 and the elastic arms 2121 that contact the PCB board holes are all designed with rounded corners 216, there are no sharp edges. This effectively avoids scratching the phosphor bronze plating layer inside the PCB board holes, thereby minimizing damage to the PCB board hole plating layer and improving the service life of the PCB board holes. The presence of the fisheye-shaped hole 22 facilitates the contraction and retraction of the two elastic arms 21, thereby increasing the pressing force and pull-out force of the press-fit connector terminal.

[0028] Based on the above-mentioned fisheye terminal, the following method can be adopted: 1. As shown in Figure 3, the middle part of the elastic arm 21 is a plane 215, and several wedge-shaped grooves 7 are provided on the plane 215 to increase friction and achieve stable installation.

[0029] 2. For example Figure 4 The two elastic arms 21 protrude to the left and right sides, and the two elastic arms 21 protrude in a staggered manner along the front and rear sides, which facilitates the stable connection of at least two sides of the four sides inside the plate hole. 3. An auxiliary elastic arm 8 is integrally formed on the outer side of the elastic arm 21. The middle of the elastic arm 21 can be cut longitudinally, but not completely severed, so the elastic arm 21 is divided into an outer elastic arm 21 and an inner elastic arm 21. The outer elastic arm 21 and the inner elastic arm 21 have an angle. When inserted into a narrow plate hole, the outer elastic arm 21 can further contract, increasing conductivity and installation stability.

[0030] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0031] In the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A fisheye terminal, characterized in that: The device includes a terminal body, on which a fish-eye shaped hole (22) is formed. The terminal body on both sides of the fish-eye shaped hole (22) forms an elastic arm (21). The first ends of the two elastic arms (21) are integrally connected to form an end (1), and the second ends of the two elastic arms (21) are integrally connected to form a root (3). The thickness of the elastic arm (21) from the first end to the second end of the fish-eye shaped hole (22) changes from narrow to wide and then narrows again.

2. The fisheye terminal according to claim 1, characterized in that: The first ends of the two elastic arms (21) are integrally formed by the upper connecting member (5) and the end (1) is connected by the upper connecting member (5), and the edge corners are all rounded (216).

3. The fisheye terminal according to claim 2, characterized in that: The outer walls on both sides of the upper connecting member (5) are rounded to connect the elastic arm (21) and the end (1).

4. The fisheye terminal according to claim 1, characterized in that: The second ends of the two elastic arms (21) are integrally formed by the lower connecting member (6) and connected to the root (3) by the lower connecting member (6).

5. The fisheye terminal according to claim 4, characterized in that: The lower connecting member (6) has inwardly curved grooves on both sides.

6. The fisheye terminal according to claim 1, characterized in that: The fish-eye shaped hole (22) includes two symmetrical partial fan-shaped sections (221) and an arc-shaped surface (222) connecting the two symmetrical partial fan-shaped sections (221).

7. The fisheye terminal according to claim 1, characterized in that: The width of the root (3) is greater than the width between the outer walls of the two elastic arms (21).

8. The fisheye terminal according to claim 1, characterized in that: The outer side wall of the elastic arm (21) is provided with an arc-shaped surface (222) transition; the middle part of the elastic arm (21) is a plane (215).

9. The fisheye terminal according to claim 1, characterized in that: The end (1) has a square structure at the top, and a 0.3mm guide chamfer is provided around the top, so that the width of the top is smaller than the radius of the hole to be inserted.

10. The fisheye terminal according to claim 1, characterized in that: The middle part of the elastic arm (21) is a plane (215), and several wedge-shaped grooves (7) are provided on the plane (215) to increase friction and achieve stable installation; And / or, the two elastic arms (21) protrude to the left and right sides, and the two elastic arms (21) protrude in a staggered manner along the front and rear sides; And / or, the outer side of the elastic arm (21) is integrally formed with an auxiliary elastic arm (8).