Fisheye terminal structure
By optimizing the curvature radius design and arc edge shape of the fisheye terminal's arc-shaped stress deformation body, the problems of increased insertion and extraction force and damage to the metal plating were solved, achieving a low-impedance electrical connection.
Patent Information
- Application Number
- CN202520095429.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-15
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-01-15
AI Technical Summary
The existing fisheye terminal has a poorly designed arc-shaped stress deformation section, which increases insertion and extraction force. Furthermore, the right-angled edge of the stress deformation section can easily damage the metal plating of the through holes on the circuit board.
Design a fisheye terminal structure, including a mating part, a limiting part, and a plug-in part. The plug-in part has a fisheye structure. The radius of curvature of the arc-shaped stress deformation body is designed such that the second radius of curvature is greater than the third radius of curvature, the third radius of curvature is greater than the first radius of curvature, and the cross section of the arc-shaped stress deformation body is arc-shaped away from the edge of the fisheye hole.
It achieves lower insertion and extraction forces and avoids damage to the metal plating of the circuit board through holes, thereby reducing signal transmission impedance.
Smart Images
Figure CN223809268U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of electric connector terminal structure especially relates to a fish eye terminal structure. BACKGROUND
[0002] The fish eye terminal is inserted into the through hole of the circuit board through the arc-shaped stress deformation part, and the stress deformation part is in contact with the metal plating layer of the through hole wall to realize the electrical connection between the terminal and the circuit board. Figure 1 The sectional view of the fish eye terminal of the prior art is shown. The edge of the stress deformation part T1 of the fish eye terminal T of the prior art is a right angle, and when the fish eye terminal T is inserted into the circuit board P, the edge of the stress deformation part T1 is easy to damage the metal plating layer of the through hole H wall, and the contact area is small, which is easy to increase the impedance of signal transmission. In addition, due to the poor size design of the arc-shaped structure of the stress deformation part T1, the fish eye terminal T increases the plugging force for the circuit board P, which increases the difficulty of assembly and disassembly. SUMMARY
[0003] The technical problem solved by the utility model is that the utility model embodiment provides a fish eye terminal structure, which solves the problem of poor size design of the arc-shaped structure of the stress deformation part of the prior art, which leads to increased plugging force, and also solves the problem that the edge of the stress deformation part of the prior art is a right angle, which easily damages the metal plating layer of the through hole wall of the circuit board.
[0004] In order to solve the above technical problems, the utility model is implemented as follows:
[0005] The fish eye terminal structure of the utility model embodiment is inserted into the plug-in hole of the circuit board, which comprises a butt joint, a limiting piece and a plug-in piece. The butt joint is arranged to form an electrical connection with the terminal of the opposing electric connector. The limiting piece is connected to the butt joint and has a width greater than the diameter of the plug-in hole, and is arranged to abut against the circuit board. The plug-in piece is connected to the limiting piece and has a fish eye structure, and is arranged to be inserted into the plug-in hole of the circuit board. The fish eye structure comprises a plug-in part, a connecting part and a deformation abutting part. The plug-in part and the connecting part are arranged at opposite ends of the deformation abutting part, respectively. The connecting part is connected to the limiting piece. The deformation abutting part comprises two arc-shaped stress deformation bodies, which are connected to each other to form a symmetrical structure with a fish eye hole in the center. The connection between the plug-in part and each arc-shaped elastic deformation body has a first curvature radius. The part of each arc-shaped stress deformation body close to the plug-in part has a second curvature radius. The part of each arc-shaped stress deformation body close to the connecting part has a third curvature radius. The second curvature radius is greater than the third curvature radius, and the third curvature radius R3 is greater than the first curvature radius.
[0006] Optionally, the first radius of curvature is 0.60 mm to 1.00 mm, the second radius of curvature R2 is 2.60 mm to 3.00 mm, and the third radius of curvature is 2.00 mm to 2.40 mm.
[0007] Optionally, the first radius of curvature is 0.80 mm, the second radius of curvature is 2.82 mm, and the third radius of curvature is 2.25 mm.
[0008] Optionally, the fisheye hole has a longest distance and a shortest distance between opposite walls, an axis of the longest distance is defined as a long axis, and an axis of the shortest distance is defined as a short axis, the long axis is parallel to the abutting piece, and the short axis is orthogonal to the long axis.
[0009] Optionally, the long axis intersects the fisheye hole at a first position and a second position, the first position is farther away from the limiting piece than the second position, the connecting part is connected to the limiting piece at a third position, a distance between the first position and the second position is the longest distance, which is 1.30 mm to 1.70 mm, and a distance between the first position and the third position is 2.00 mm to 2.40 mm.
[0010] Optionally, the distance between the first position and the second position is 1.50 1.40 mm, and the distance between the first position and the third position is 2.08 mm.
[0011] Optionally, the fisheye hole is a hollow structure.
[0012] Optionally, a cross section of each arc-shaped stress deformation body is circular arc-shaped away from an edge of the fisheye hole.
[0013] Optionally, the plug-in piece is inserted into the plug-in hole of the circuit board, and a force for separating the plug-in piece from the plug-in hole is at least 50 NT.
[0014] Optionally, the abutting piece and the plug-in piece are parallel to each other and extend in opposite directions, and the limiting piece is perpendicular to the abutting piece and the plug-in piece.
[0015] The technical effects of the utility model are as follows:
[0016] The fisheye terminal structure of the utility model has a smaller plug-in force when the fisheye terminal structure is connected with the circuit board, because the second radius of curvature is greater than the third radius of curvature, and the third radius of curvature is greater than the first radius of curvature. Moreover, the cross section of each arc-shaped stress deformation body is circular arc-shaped away from an edge of the fisheye hole, so that the metal plating layer of the through hole of the circuit board can be avoided from being damaged. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 is a sectional view of a fisheye terminal of the prior art;
[0018] Figure 2is a perspective view of the fisheye terminal of one embodiment of the utility model;
[0019] Figure 3 is Figure 2 a partial enlarged view of the limiting piece and the plug-in piece of the fisheye terminal of
[0020] Figure 4 is Figure 3 a side view of
[0021] Figure 5 is Figure 4 a sectional view along A-A line of
[0022] Figure 6 is Figure 2 a sectional view of the fisheye terminal of being inserted in the circuit board
[0023] Figure 7 is Figure 6 a sectional view along B-B line of DETAILED DESCRIPTION
[0024] Please refer to Figure 2 and Figure 3 , which indicate the fisheye terminal of one embodiment of the utility model. The fisheye terminal 1 of the embodiment includes a mating piece 10, a limiting piece 20 and a plug-in piece 30.
[0025] The mating piece 10 is arranged to form electrical connection with the terminal of the mating connector, and the mating piece 10 of the embodiment is needle-shaped, which can be used in the wire-to-board connector or the board-to-board connector.
[0026] The limiting piece 20 is connected to the mating piece 10 and extends along the direction perpendicular to the mating piece 10. The limiting piece 20 has length and width greater than the diameter of the plug-in hole of the circuit board, so that when the plug-in piece 30 is inserted into the plug-in hole of the circuit board, the limiting piece 20 can abut against the surface of the circuit board to form limiting.
[0027] The plug-in piece 30 is connected to the limiting piece 20 and has a fisheye structure 30a and is arranged to be inserted into the plug-in hole of the circuit board. The fisheye structure 30a interferes with the hole wall of the plug-in hole of the circuit board to produce stress deformation, so as to abut against the hole wall of the plug-in hole, and the plug-in force between the fisheye terminal 1 and the circuit board is generated by the friction force between the fisheye structure 30a and the hole wall. The friction force is related to the abutting force of the fisheye structure 30a abutting against the hole wall, and the abutting force of the fisheye structure 30a is related to the deformation amount of the fisheye structure 30a producing stress deformation, so the shape and size of each part of the fisheye structure 30a will affect the deformation amount of the fisheye structure 30a when being inserted into the plug-in hole, and further affect the plug-in force between the fisheye terminal 1 and the circuit board.
[0028] The docking piece 10 and the plug-in piece 30 are parallel to each other and extend in opposite directions, and the limiting piece 20 is perpendicular to the docking piece 10 and the plug-in piece 30.
[0029] Please refer to Figure 3 The fisheye structure 30a of the embodiment includes a plug-in part 31, a connecting part 32 and a deformed abutting part 33, the plug-in part 31 and the connecting part 32 are respectively arranged at opposite ends of the deformed abutting part 33, the connecting part 32 is connected to the limiting piece 20, the plug-in part 31 is a free end, and the end thereof is tapered to facilitate insertion into the plug-in hole of the circuit board. The deformed abutting part 33 includes two arc-shaped stress deformation bodies 331, the two arc-shaped stress deformation bodies 331 are connected to each other to form a symmetrical structure having a fisheye hole 30b in the center. The fisheye hole 30b is a hollow structure and does not have any other structures or components arranged therein.
[0030] The connection between the plug-in part 31 and each arc-shaped stress deformation body 331 has a first radius of curvature R1, the part 331a of each arc-shaped stress deformation body 331 close to the plug-in part 31 has a second radius of curvature R2, and the part 331b of each arc-shaped stress deformation body 331 close to the connecting part 32 has a third radius of curvature R3, the second radius of curvature R2 is greater than the third radius of curvature R3, and the third radius of curvature R3 is greater than the first radius of curvature R1.
[0031] The first radius of curvature R1 of the embodiment is in the range of 0.60 mm to 1.00 mm, the second radius of curvature R2 is in the range of 2.60 mm to 3.00 mm, and the third radius of curvature R3 is in the range of 2.00 mm to 2.40 mm. Preferably, the first radius of curvature R1 of the embodiment is 0.80 mm, the second radius of curvature R2 is 2.82 mm, and the third radius of curvature R3 is 2.25 mm.
[0032] The fisheye hole 30b has a longest distance and a shortest distance between opposite wall surfaces, an axis defined by the longest distance is defined as a major axis L1, and an axis defined by the shortest distance is defined as a minor axis L2, the major axis is parallel to the docking piece 10, and the minor axis L2 is orthogonal to the major axis L1.
[0033] The long axis L1 intersects with the fisheye hole 30b at a first position P1 and a second position P2, the first position P1 is farther away from the limiting piece 20 than the second position P2, the connecting part 32 is connected with the limiting piece 20 at a third position P3, the distance between the first position P1 and the second position P2 is the longest distance, which is 1.30mm to 1.70mm, and the distance between the first position P1 and the third position P3 is 2.00mm to 2.40mm. Preferably, the distance between the first position P1 and the second position P2 of the embodiment is 1.40mm, and the distance between the first position P1 and the third position P3 is 2.08mm. Thus, based on the shape and size of each part of the fisheye structure 30a, the plug-in part 30 is inserted into the plug-in hole of the circuit board, and at least 50NT of force is required to separate the plug-in part 30 from the plug-in hole.
[0034] Referring to Figure 4 and Figure 5 The cross section of each arc-shaped stress deformation body 331 is circular arc-shaped away from the edge 331c of the fisheye hole 30b.
[0035] Referring to Figure 6 and Figure 7 The plug-in part 30 of the fisheye terminal 1 of the embodiment is inserted into the plug-in hole H1 of the circuit board P, the arc-shaped stress deformation body 331 of the deformation abutting part 33 of the fisheye structure 30a of the plug-in part 30 is interfered to produce stress deformation with the hole wall of the plug-in hole H1, and the limiting piece 20 abuts against the surface of the circuit board P. Since the cross section of each arc-shaped stress deformation body 331 is circular arc-shaped away from the edge 331c of the fisheye hole 30b, when the plug-in part 30 is inserted into the plug-in hole H1 of the circuit board P, the arc-shaped stress deformation body 331 has a larger contact area with the hole wall of the plug-in hole H1, and the arc-shaped stress deformation body 331 has a better configuration matching with the hole wall of the plug-in hole H1, which can avoid damaging the metal plating layer of the hole wall of the plug-in hole H1, and reduce the impedance between the fisheye terminal 1 and the metal plating layer.
[0036] The fisheye terminal structure of the utility model has smaller plug-in force when the fisheye terminal structure of the utility model is connected with the circuit board. Moreover, the cross section of each arc-shaped stress deformation body is circular arc-shaped away from the edge of the fisheye hole, which can avoid damaging the metal plating layer of the hole of the circuit board.
Claims
1. A fisheye terminal structure to be inserted into a plug-in hole (Hl) of a circuit board (P), characterized by, The utility model relates to a connector, comprising: a mating piece (10) configured to form an electrical connection with a terminal of a mating connector; a limiting piece (20) connected to the mating piece (10) and having a width greater than a diameter of the insertion hole (H1) configured to abut against the circuit board (P); an insertion piece (30) connected to the limiting piece (20) and having a fisheye structure (30a) configured to be inserted into the insertion hole of the circuit board (P), the fisheye structure (30a) comprising an insertion portion (31), a connecting portion (32), and a deformed abutting portion (33), the insertion portion (31) and the connecting portion (32) being respectively disposed at opposite ends of the deformed abutting portion (33), the connecting portion (32) being connected to the limiting piece (20), and the deformed abutting portion (33) comprising two arc-shaped stress deformation bodies (331) connected to each other to form a symmetrical structure having a fisheye hole (30b) at the center; wherein the insertion portion (31) and a connection between each of the arc-shaped stress deformation bodies (331) have a first radius of curvature (R1), a portion (331a) of each of the arc-shaped stress deformation bodies (331) close to the insertion portion (31) has a second radius of curvature (R2), and a portion (331b) of each of the arc-shaped stress deformation bodies (331) close to the connecting portion (32) has a third radius of curvature (R3), the second radius of curvature (R2) being greater than the third radius of curvature (R3), and the third radius of curvature (R3) being greater than the first radius of curvature (R1).
2. The fisheye terminal structure of claim 1, wherein The first radius of curvature (R1) is 0.60 mm to 1.00 mm, the second radius of curvature (R2) is 2.60 mm to 3.00 mm, and the third radius of curvature (R3) is 2.00 mm to 2.40 mm.
3. The fisheye terminal structure of claim 2, wherein The first radius of curvature (R1) is 0.80 mm, the second radius of curvature (R2) is 2.82 mm, and the third radius of curvature (R3) is 2.25 mm.
4. The fisheye terminal structure of claim 1, wherein The fisheye hole (30b) has a longest distance and a shortest distance between opposite walls, an axis of the longest distance is defined as a major axis (L1), and an axis of the shortest distance is defined as a minor axis (L2), the major axis (L1) being parallel to the mating piece (10), and the minor axis (L2) being orthogonal to the major axis (L1).
5. The fisheye terminal structure of claim 4, wherein The major axis (L1) intersects the fisheye hole (30b) at a first position (P1) and a second position (P2), the first position (P1) being farther away from the limiting piece (20) than the second position (P2), the connecting portion (32) being connected to the limiting piece (20) at a third position (P3), a distance between the first position (P1) and the second position (P2) being the longest distance, which is 1.30 mm to 1.70 mm, and a distance between the first position (P1) and the third position (P3) being 2.00 mm to 2.40 mm.
6. The fisheye terminal structure of claim 5, wherein The distance between the first position (P1) and the second position (P2) is 1.40 mm, and the distance between the first position (P1) and the third position (P3) is 2.08 mm.
7. The fisheye terminal structure of claim 1, wherein The fisheye hole (30b) is a hollow structure.
8. The fisheye terminal structure of claim 1, wherein The edge (331c) of the cross section of each arc-shaped stress deformation body (331) is in a circular arc shape away from the edge of the fisheye hole (30b).
9. The fisheye terminal structure of claim 1, wherein The plug-in part (30) is inserted into the plug-in hole (H1) of the circuit board (P), and the force for separating the plug-in part (30) from the plug-in hole (H1) is at least 50 NT.
10. The fisheye terminal structure of claim 1, wherein The docking part (10) and the plug-in part (30) are parallel to each other and extend in opposite directions, and the limiting part (20) is perpendicular to the docking part (10) and the plug-in part (30).