Double-fish-eye-hole terminal parallel connection structure for PCB connection and PCB assembly

Abstract

The invention relates to a double-fisheye-hole terminal parallel connection structure for PCB connection, which comprises a conductive terminal inserted into a PCB through a mounting hole, the conductive terminal comprises a guide part, a first support part, a second support part and a mounting part which are connected in sequence along the insertion direction, a first fisheye hole is formed in the first support part, a second fisheye hole is formed in the second support part, and the first fisheye hole and the second fisheye hole are arranged in the mounting part. Elastic arms capable of elastically deforming in the radial direction are formed on the peripheries of the first fisheye hole and the second fisheye hole. Through the two fisheye hole structures connected in parallel, a redundant conductive channel is formed, the current-carrying capacity is remarkably improved, meanwhile, the overall connection resistance is reduced, the energy loss and the temperature rise are reduced, even if one contact point loses efficacy due to vibration, pollution or abrasion, the other contact point can still maintain electrical connection, the system is not interrupted, and the use stability is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of fisheye terminal technology, specifically relating to a parallel structure of dual fisheye hole terminals for PCB connection and a PCB assembly. Background Technology

[0002] In the field of electronic equipment manufacturing and assembly, the reliability, current carrying capacity, and long-term stability of the connection between printed circuit boards (PCBs) and external electrical components have always been key factors affecting product performance and service life.

[0003] Common connecting components, such as "fisheye terminals," mainly adopt a single fisheye hole design. That is, the terminal body has only one outwardly protruding elastic contact structure. When inserted into the PCB mounting hole, the elastic deformation of the fisheye hole generates radial pressure, forming electrical contact with the metallized hole wall. The structure is simple, the assembly is convenient, and it has certain advantages.

[0004] However, in practical applications, the single fisheye aperture structure provides only a single physical contact path, and its current-carrying capacity depends entirely on the cross-sectional area and contact quality of a single contact point. Furthermore, in high-current applications, this contact point is prone to localized temperature rise due to current concentration, which can easily lead to a further increase in contact resistance, creating a vicious cycle of heat and electricity. This not only limits the overall power transmission efficiency of the system but also poses the risk of connection aging, material degradation, and even failure due to overheating.

[0005] Moreover, because electrical connection is achieved through only one contact point, if that point becomes loose due to vibration, fretting wear, contamination oxidation, or mechanical fatigue, resulting in poor contact or complete disconnection, the entire electrical path will be interrupted, and the system will lose its function. If maintenance is required, the entire connection terminal or related module must be disassembled for inspection or replacement, which is not only complex and time-consuming, but also affects the integrity of surrounding components. Summary of the Invention

[0006] To achieve the above objectives, the present invention proposes a parallel structure of dual fisheye hole terminals for PCB connection, including conductive terminals that are inserted into the PCB through mounting holes. The conductive terminals include a guide portion, a first support portion, a second support portion, and a mounting portion connected sequentially along the insertion direction. A first fisheye hole is formed in the first support portion, and a second fisheye hole is formed in the second support portion. The periphery of the first fisheye hole and the second fisheye hole forms an elastic arm capable of radial elastic deformation.

[0007] Preferably, the electrical interconnection between the first fisheye hole and the second fisheye hole is achieved through the conductivity of the conductive terminal body itself.

[0008] Preferably, the center-to-center distance between the first fisheye hole and the second fisheye hole is 2.54 mm.

[0009] Preferably, the radial dimensions of the first support portion and the second support portion are greater than the radial dimension of the mounting hole, and the radial dimension of the first fisheye hole is equal to the radial dimension of the second fisheye hole.

[0010] Preferably, reinforcing holes are symmetrically provided between the first fisheye hole and the second fisheye hole, and the reinforcing holes are perpendicular to the insertion direction.

[0011] Preferably, an anti-dismantling hole is recessed between the outer sides of the first support portion and the second support portion.

[0012] Another aspect of the present invention proposes a PCB assembly for use in a parallel structure of dual fisheye holes for fisheye terminals, comprising:

[0013] PCB having at least one common conductive layer;

[0014] A first pad that is matched and connected to the first fisheye hole, and a second pad that is matched and connected to the second fisheye hole, wherein the first pad and the second pad are disposed on the same surface layer of the PCB;

[0015] A parallel conductive path is provided on a common conductive layer and electrically connects the first pad and the second pad.

[0016] Preferably, the parallel conductive path includes:

[0017] The first via is connected at one end to the first pad;

[0018] The second via is connected at one end to the second pad;

[0019] The common conductive layer is located on the opposite surface layer of the printed circuit board. The other ends of the first via and the second via are electrically connected to the common conductive layer, and the parallel connection between the first pad and the second pad is realized through the common conductive layer.

[0020] Preferably, a heat dissipation layer is provided at the bottom of the common conductive layer, and the heat dissipation layer and the common conductive layer are connected by a thermally conductive via array, the thermally conductive via array including a plurality of solid copper-filled vias.

[0021] Preferably, the heat dissipation layer is a heat dissipation copper foil.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] This invention forms redundant conductive channels through two parallel fisheye hole structures, which significantly improves the current carrying capacity, while reducing the overall connection resistance, reducing energy loss and temperature rise. Even if one contact point fails due to vibration, contamination or wear, the other can still maintain electrical connection, ensuring uninterrupted system operation and stable use.

[0024] The dual-hole parallel design of this invention disperses stress and improves stability under vibration and impact environments. The reinforced hole can prevent structural deformation caused by repeated insertion and removal, and ensure the service life of the conductive terminals.

[0025] A large area of ​​heat-dissipating copper foil is placed under the common conductive layer, and heat is quickly conducted to the heat dissipation layer through an array of thermally conductive vias, which enhances the heat diffusion capability and maintains stable operation at low temperatures. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the conductive terminal in this invention;

[0027] Figure 2 This is a three-dimensional structural diagram of the PCB assembly in this invention;

[0028] Figure 3 This is a diagram showing the application state of the conductive terminals in this embodiment;

[0029] Figure 4 This is another perspective view of the present invention;

[0030] Figure 5 This is a cross-sectional schematic diagram of the parallel conductive path in this invention;

[0031] Figure 6 This is a schematic diagram illustrating the application of this embodiment.

[0032] The diagram labels are as follows: 1-PCB, 101-mounting hole, 11-common conductive layer, 12-first pad, 13-second pad, 14-parallel conductive path, 141-first via, 142-second via, 2-conductive terminal, 201-guide, 202-first support, 203-second support, 204-mounting part, 205-first fisheye hole, 206-second fisheye hole, 207-elastic arm, 3-reinforcing hole, 4-anti-tamper hole, 5-heat dissipation layer. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1

[0035] like Figures 1 to 4The parallel structure of dual fisheye hole terminals for PCB connection shown includes conductive terminals 2 that are inserted into the PCB through mounting holes 101. Each conductive terminal 2 includes a guide portion 201, a first support portion 202, a second support portion 203, and a mounting portion 204 connected sequentially along the insertion direction. A first fisheye hole 205 is formed in the first support portion 202, and a second fisheye hole 206 is formed in the second support portion 203. Elastic arms 207 capable of radial elastic deformation are formed around the peripheries of the first fisheye hole 205 and the second fisheye hole 206. The electrical connections of the first fisheye hole 205 and the second fisheye hole 206 are... Interconnection is achieved through the conductivity of the conductive terminal 2 itself; the center distance between the first fisheye hole 205 and the second fisheye hole 206 is 2.54mm; the radial dimensions of the first support part 202 and the second support part 203 are greater than the radial dimension of the mounting hole 101, and the radial dimension of the first fisheye hole 205 is equal to the radial dimension of the second fisheye hole 206; symmetrical reinforcing holes 3 are provided between the first fisheye hole 205 and the second fisheye hole 206, and the reinforcing holes 3 are perpendicular to the insertion direction; an anti-tampering hole 4 is recessed between the outer sides of the first support part 202 and the second support part 203.

[0036] A PCB assembly for use in a parallel structure of dual fisheye holes for fisheye terminals is also proposed, comprising: a PCB having at least one common conductive layer 11; a first pad 12 mating and connected to a first fisheye hole 205, and a second pad 13 mating and connected to a second fisheye hole 206, the first pad 12 and the second pad 13 being disposed on the same surface layer of the PCB; and a parallel conductive path 14 disposed on the common conductive layer 11, electrically connecting the first pad 12 and the second pad 13; the parallel conductive path 14 comprising: a first via 141, one end of which is connected to the first pad 12; and a second via 142, one end of which is connected to the second pad 13. The common conductive layer 11 is located on the opposite surface layer of the printed circuit board. The other ends of the first via 141 and the second via 142 are electrically connected to the common conductive layer 11, and the parallel connection between the first pad 12 and the second pad 13 is realized through the common conductive layer 11. A heat dissipation layer 5 is provided at the bottom of the common conductive layer 11. The heat dissipation layer 5 is connected to the common conductive layer 11 through a thermal via array, which includes multiple solid copper-filled vias. The heat dissipation layer 5 is a heat dissipation copper foil.

[0037] This invention utilizes a redundant conductive channel formed by two parallel fisheye holes, significantly improving current carrying capacity while reducing overall connection resistance, energy loss, and temperature rise. Even if one contact point fails due to vibration, contamination, or wear, the other can still maintain electrical connection, ensuring uninterrupted system operation and operational stability. The parallel dual-hole design disperses stress and improves stability under vibration and impact environments. The reinforced hole 3 prevents structural deformation caused by repeated insertion and removal, ensuring the service life of the conductive terminal 2. A large-area heat-dissipating copper foil is placed below the common conductive layer 11, and heat is rapidly conducted to the heat dissipation layer 5 through a thermally conductive via array, enhancing heat diffusion and maintaining stable operation at low temperatures.

[0038] Example 2

[0039] like Figure 1 , Figures 3 to 4 The parallel structure of dual fisheye hole terminals for PCB connection shown includes one or more conductive terminals 2. Each conductive terminal 2 is elastically inserted and electrically connected to the PCB through mounting holes 101. Specifically, a set of mounting holes 101 arranged in parallel are opened at a predetermined position on the PCB. These mounting holes 101 are connected in parallel through internal circuitry to form redundant conductive channels. The conductive terminals 2 are made of highly elastic conductive material, and their main body forms at least two outwardly protruding elastic fisheye contact structures. When inserted into the mounting holes 101, they undergo elastic deformation, generating continuous radial pressure, thereby maintaining tight contact with the metallized hole walls of the dual fisheye holes.

[0040] The parallel structure in this embodiment provides dual-path current transmission, which significantly improves current carrying capacity and connection reliability. It also reduces contact resistance and the risk of failure of a single contact point through multi-point contact, and enhances vibration and shock resistance. Furthermore, the dual-hole parallel design has better guidance and tolerance absorption capabilities during assembly, which facilitates automated assembly and has strong applicability.

[0041] Example 3

[0042] like Figure 1 , Figures 3 to 4The parallel structure of dual fisheye hole terminals for PCB connection shown includes a conductive terminal 2 comprising a guide portion 201, a first support portion 202, a second support portion 203, and a mounting portion 204 connected sequentially along the insertion direction. The guide portion 201 is located at the foremost end of the conductive terminal 2, and its outline is a smooth conical or hemispherical rounded edge, ensuring that the terminal can be smoothly inserted into the PCB mounting hole 101 even with slight alignment deviations, while effectively preventing the terminal edge from scratching the plating inside the hole. The first support portion 202 and the second support portion 203 form the main elastic area for electrical connection. The first support portion 202 has a first fisheye hole 205, and the second support portion 203 has a second fisheye hole 206. Both the first fisheye hole 205 and the second fisheye hole 206 are non-closed elliptical or oblong openings, and their own structure has an inwardly convex elastic contact surface.

[0043] In this case, the radial dimensions of the first and second support portions 203 in their free state are slightly larger than the inner diameter of the corresponding mounting holes 101 on the PCB. As a result, when the conductive terminal 2 is pressed into the mounting hole 101, the first and second support portions 203 will be subjected to the compression of the hole wall and undergo elastic deformation, thereby generating a continuous and stable radial contact pressure between the hole wall and the convex curved surface of the fisheye hole, ensuring a low-resistance and highly reliable electrical connection.

[0044] An anti-tamper hole 4 is recessed between the outer sides of the first support part 202 and the second support part 203. After the conductive terminal 2 is inserted into place, the thick part of the PCB board will be locked into this recessed area, forming a "buckle"-like fit with the support part, which effectively prevents the conductive terminal 2 from accidentally coming out due to vibration or external force, and improves the mechanical holding force of the connection. At the same time, the anti-tamper hole 4, as a preset deformation area, can accurately control the elastic deformation behavior of the first and second support parts 203 when under pressure, avoid excessive stress concentration, and thus improve the insertion and removal life and fatigue resistance of the terminal.

[0045] Mounting part 204 is located at the end of conductive terminal 2, specifically as a solder foot, used to fix and electrically connect with cable, another PCB or equipment housing, thereby completing the conduction path of the entire circuit.

[0046] Continuing from above, the first fisheye hole 205 and the second fisheye hole 206 are both non-closed elliptical or oblong openings. Their own structure has an inwardly convex elastic contact surface, specifically forming an elastic arm 207 that can deform radially. When the conductive terminal 2 is pressed into the mounting hole 101 of the PCB, they can deform evenly and smoothly, thereby generating continuous and consistent radial contact pressure to ensure low impedance and high stability of the contact interface.

[0047] In terms of dimensions, the free-state radial dimension of the first fisheye hole 205 is designed to be equal to the radial dimension of the second fisheye hole 206, in order to ensure that the forces on the two parallel contact points are balanced during insertion and that the current distribution is uniform, which helps to optimize current carrying capacity and thermal management.

[0048] The first fisheye hole 205 and the second fisheye hole 206 are arranged in parallel along the axial direction at a predetermined distance on the conductive terminal 2. The two fisheye holes are directly connected through the conductive material inside the conductive terminal 2 to form a parallel connection port. The center distance between the two is a standardized design, specifically the common 2.54mm (0.1 inch), or other standard distances (such as 2.0mm, 1.27mm, etc.). The standardized distance design allows this product to be perfectly compatible with common PCB layouts, test fixtures and automated assembly equipment, improving the product's versatility and production efficiency.

[0049] A reinforcing hole 3 is symmetrically provided on the conductive terminal 2 in the area between the first fisheye hole 205 and the second fisheye hole 206. The shape of the reinforcing hole 3 can be circular, square or oblong, and its axis is perpendicular to the insertion direction of the terminal. By retaining solid material perpendicular to the insertion direction to form a reinforcing rib, the elastic deformation area is precisely limited to the elastic arm 207 part of the fisheye hole, avoiding undesirable deformation in the middle area and preventing the conductive terminal 2 from bending or permanent deformation due to repeated insertion and removal or external stress.

[0050] Example 4

[0051] like Figure 2 , Figures 3 to 4 The PCB assembly shown is applied to the parallel structure of the double fisheye hole of the fisheye terminal. The PCB has at least one common conductive layer 11. The common conductive layer 11 is located on the opposite surface layer of the printed circuit board. It can also be located in the middle layer of the PCB, or exist as an internal power layer (such as a power layer or ground layer) to provide a low-impedance common path for current.

[0052] The PCB surface mount surface has two independent pads at each mounting position of the conductive terminal 2: a first pad 12 and a second pad 13. The two pads are matched and aligned with the first fisheye hole 205 and the second fisheye hole 206 of the conductive terminal 2, respectively. Specifically, they are arranged parallel to each other on the same surface layer of the PCB along the terminal insertion axis, and their center spacing is consistent with the spacing of the two fisheye holes, so as to ensure that after insertion, the elastic arm 207 of each fisheye hole can form an annular surface contact with the corresponding pad area.

[0053] The top of the common conductive layer 11 is provided with a parallel conductive path 14 that electrically connects the first pad 12 and the second pad 13. The parallel conductive path 14 includes: a first via 141 connected to the first pad 12 at one end, and a second via 142 connected to the second pad 13 at one end. The first via 141 extends vertically through the PCB dielectric layer from the first pad 12, with one end electrically connected to the first pad 12 and the other end electrically connected to the internal common conductive layer 11. The second via 142 also extends vertically through the PCB from the second pad 13, with one end connected to the second pad 13 and the other end electrically connected to the same common conductive layer 11.

[0054] Example 5

[0055] like Figures 1 to 6 As shown, it is understandable that in practical use, the structure of embodiment 3.4 allows the guide portion 201 of the conductive terminal 2 to be inserted into the mounting hole 101 first. Subsequently, the first support portion 202 and the second support portion 203 are elastically moved inward by the mounting hole 101 to avoid being squeezed, causing the first fisheye hole 205 and the second fisheye hole 206 to deform and disengage from the first pad 12 and the second pad 13, thus achieving electrical connection. Furthermore, the parallel electrical connection and the dual-path parallel transmission of current are completed through the parallel conductive path 14. When current flows into or out of the conductive terminal 2, the current will automatically be transmitted through two physically parallel paths.

[0056] Path A: Conductive terminal 2 → First fisheye hole 205 contact point → First pad 12 → First via 141 → Common conductive layer 11;

[0057] Path B: Conductive terminal 2 → Second fisheye hole 206 contact point → Second pad 13 → Second via 142 → Common conductive layer 11;

[0058] Therefore, after the current converges in the common conductive layer 11, it flows to the target circuit.

[0059] The total current carrying capacity of the above design is approximately twice that of the single fisheye hole design. Even if one contact point experiences increased contact resistance or even temporary failure due to vibration loosening, contamination, or fretting wear, the other contact point can still maintain electrical connection independently, ensuring uninterrupted system function. Furthermore, the parallel path significantly reduces the overall connection resistance, thereby reducing energy loss and contact point temperature rise, and improving long-term stability.

[0060] In addition, this embodiment is based on the design of two holes independently connected to the same electrical node. It can be realized that without disassembling the terminals, the working status of the two parallel points can be judged by contacting the first pad 12 and the second pad 13 respectively with a dedicated test probe, so as to realize preventive maintenance. During the research and development or troubleshooting stage, one of the paths can be temporarily disconnected to test the system performance of single-path operation.

[0061] Example 6

[0062] like Figure 6 As shown, a heat dissipation layer 5 is provided at the bottom of the common conductive layer 11. The heat dissipation layer 5 is specifically a continuous large-area heat dissipation copper foil with an area not less than the projected area of ​​the common conductive layer 11, so as to maximize its heat diffusion capacity. The heat dissipation layer 5 and the common conductive layer 11 are connected by an array of thermally conductive vias.

[0063] The thermal via array includes multiple solid copper-filled vias arranged in a regular grid matrix, evenly distributed below and around the double fisheye hole connection area. This ensures that any local heat generated on the common conductive layer 11 can be quickly and evenly guided to the heat dissipation layer 5 below through the shortest vertical path. Furthermore, the heat dissipation layer 5 is configured to be electrically floating in the circuit to avoid introducing unnecessary electrical interference and maintain the independence of thermal management.

[0064] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0065] The above description is only used to illustrate the technical solution of the present invention and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A parallel structure of dual fisheye hole terminals for PCB connection, comprising conductive terminals that are inserted into the PCB through mounting holes, characterized in that, The conductive terminal includes a guide portion, a first support portion, a second support portion, and a mounting portion connected sequentially along the insertion direction. The first support portion has a first fisheye hole, and the second support portion has a second fisheye hole. The periphery of the first fisheye hole and the second fisheye hole forms an elastic arm capable of radial elastic deformation.

2. The parallel structure of double fisheye hole terminals for PCB connection according to claim 1, characterized in that, The electrical interconnection between the first fisheye hole and the second fisheye hole is achieved through the conductivity of the conductive terminal body itself.

3. The parallel structure of double fisheye hole terminals for PCB connection according to claim 1, characterized in that, The center-to-center distance between the first and second fisheye holes is 2.54 mm.

4. The parallel structure of double fisheye hole terminals for PCB connection according to claim 1, characterized in that, The radial dimensions of the first support portion and the second support portion are greater than the radial dimension of the mounting hole, and the radial dimension of the first fisheye hole is equal to the radial dimension of the second fisheye hole.

5. The parallel structure of double fisheye hole terminals for PCB connection according to claim 1, characterized in that, A reinforcing hole is symmetrically provided between the first fisheye hole and the second fisheye hole, and the reinforcing hole is perpendicular to the insertion direction.

6. The parallel structure of double fisheye hole terminals for PCB connection according to claim 1, characterized in that, An anti-dismantling hole is recessed between the outer sides of the first support part and the second support part.

7. A PCB assembly using the fisheye terminal double fisheye hole parallel structure as described in any one of claims 1-6, characterized in that, include: PCB having at least one common conductive layer; A first pad that is matched and connected to the first fisheye hole, and a second pad that is matched and connected to the second fisheye hole, wherein the first pad and the second pad are disposed on the same surface layer of the PCB; A parallel conductive path is provided on a common conductive layer and electrically connects the first pad and the second pad.

8. The PCB assembly according to claim 7, characterized in that, The parallel conductive path includes: The first via is connected at one end to the first pad; The second via is connected at one end to the second pad; The common conductive layer is located on the opposite surface layer of the printed circuit board. The other ends of the first via and the second via are electrically connected to the common conductive layer, and the parallel connection between the first pad and the second pad is realized through the common conductive layer.

9. The PCB assembly according to claim 7, characterized in that, The common conductive layer has a heat dissipation layer at its bottom, and the heat dissipation layer is connected to the common conductive layer through a thermal via array, which includes a plurality of solid copper-filled vias.

10. The PCB assembly according to claim 7, characterized in that, The heat dissipation layer is a heat dissipation copper foil.

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