Anti-crosstalk shielding grounding device of connector cable

Abstract

The utility model relates to an anti-crosstalk shielding grounding device of a connector cable, which comprises a PCB (printed circuit board) and a plurality of groups of signal pad areas arranged on the PCB, each group comprises a plurality of signal pad areas arranged side by side and cables and grounding pad areas arranged corresponding to the signal pad areas, signal pads are arranged in the signal pad areas, and the signal pads are arranged in the grounding pad areas. The cable is characterized by further comprising an integrated shielding support arranged corresponding to each group of signal bonding pad areas, the integrated shielding support comprises a base and a cover cap buckled on the base, the bottom of the base is welded to the grounding bonding pad area through SMT, and the bottom of the base is welded to the grounding bonding pad area through SMT. The base is divided into a plurality of cable mounting grids corresponding to the signal bonding pad areas by partitions, the front part of each cable mounting grid is provided with a hollow groove for welding a signal conductor of a cable and a corresponding signal bonding pad, and the rear part of each cable mounting grid is provided with a base concave platform for embedding an aluminum foil exposed out of the cable; clamping plates in one-to-one correspondence with the partitions are arranged on the cover cap, and clamping grooves allowing the clamping plates to be embedded therein are formed in the partitions. According to the utility model, shielding and blocking of a plurality of strands of cables can be completed at one time, assembling is convenient, and blocking performance and sealing performance are more excellent.

Description

Technical Field

[0001] This utility model relates to a crosstalk shielding grounding device for connector cables. Background Technology

[0002] High-speed connectors in the telecommunications industry typically consist of a PCB and multiple strands of cables connected to it. After the outer sheath of these cables is removed, the inner aluminum foil and insulating sheath are sequentially cut to expose the inner conductors (copper wires). The conductors are then soldered to pre-set signal pads on the PCB to complete the connection. A grounding wire is connected to the aluminum foil, which is soldered to the grounding pad on the PCB to ensure the stability of the signal channels for each cable. Because the aluminum foil, which provides signal shielding, is cut away from the conductors, the electromagnetic signals radiating outward from the conductors lack obstruction, leading to significant crosstalk between the cables. Furthermore, current PCB manufacturing generally employs a symmetrical fan-out design, meaning all vias are symmetrical and equally spaced. This causes magnetic field induction between adjacent conductors when current passes through them, further enhancing crosstalk.

[0003] To address the aforementioned signal crosstalk problem, the current solution is to install a shielded grounding device (or structure) on the PCB to improve crosstalk. This shielded grounding device typically has ground feet that are soldered to grounding pads, and the grounding wire of the aluminum foil is directly soldered to the shielded grounding device.

[0004] However, the existing shielding and grounding devices have the following drawbacks:

[0005] 1. These are often individual units assembled one-to-one with each cable, requiring each one to be aligned and assembled during production, resulting in cumbersome and inefficient assembly. Furthermore, the large number of parts undoubtedly increases production costs.

[0006] 2. For multi-strand cables laid out side by side, due to the limitations of the PCB board surface and the fixed specifications of the shielding and grounding devices, it is often difficult to install multiple shielding and grounding devices at the same time without causing interference, which also brings trouble to production and assembly.

[0007] 3. The existing shielding devices still do not provide sufficient barrier and sealing performance. Summary of the Invention

[0008] The purpose of this invention is to address the shortcomings of existing shielding and grounding devices mentioned in the background art by providing a crosstalk shielding and grounding device for connector cables. This device can shield and block multiple cables at once, and is easy to assemble, with superior blocking and sealing performance.

[0009] The technical solution of this utility model is: a crosstalk shielding and grounding device for connector cables, including a PCB and multiple sets of signal pad areas disposed thereon. Each set of signal pad areas includes several signal pad areas arranged side by side, as well as cables and grounding pad areas corresponding to each signal pad area. Signal pads are provided in the signal pad areas. The outer sheath of the cable is cut off to expose aluminum foil and a central signal conductor is led out. The feature is that it also includes an integrated shielding bracket disposed corresponding to each set of signal pad areas. The integrated shielding bracket includes a base and a cover fixed to the base. The bottom of the base is soldered to the grounding pad area by SMT. The base is divided by partitions into several cable mounting grids corresponding to each signal pad area. The front of each cable mounting grid is provided with a hollow groove for soldering the signal conductor of the cable to the corresponding signal pad, and the rear of the cable mounting grid is a base recess for embedding the exposed aluminum foil of the cable. The cover is provided with a card plate corresponding to each partition, and the partition is provided with a slot for embedding the card plate.

[0010] Furthermore, the inner wall of the base recess described in this utility model is provided with several bottom protrusions for contacting the aluminum foil. The bottom protrusions ensure good contact between the base recess and the cable aluminum foil, thereby improving contact performance.

[0011] Furthermore, the cover in this invention has a cover recess corresponding to the base recess, and the inner wall of the cover recess has several top protrusions for contacting the aluminum foil. The top protrusions ensure good contact between the cover recess and the cable aluminum foil, improving contact performance.

[0012] Furthermore, in this utility model, each partition of the base is provided with a plurality of connecting protrusions, and the cover is provided with connecting holes that correspond to and are inserted into the connecting protrusions one by one.

[0013] Furthermore, in this invention, the base and the cover are fixed together by spot welding.

[0014] Furthermore, in this invention, each of the hollowed-out slots is fitted with an insulating support block that abuts against the front end of the base recess. This insulating support block has an arc-shaped or angled groove for embedding and supporting the signal conductor at the front end of the corresponding cable. The arc-shaped or angled groove reduces the bending radius of the signal conductor, thereby adjusting its impedance and ensuring that the impedance between the signal pad and the aluminum foil (grounding layer) is as uniform as possible, thus reducing signal loss.

[0015] Furthermore, the insulating support block described in this invention is a rubber support block, with an arc-shaped or oblique groove on it wrapping around the embedded signal conductor, thereby enhancing the shielding performance of the signal conductor.

[0016] Furthermore, the cable described in this utility model is an existing differential signal cable, with a pair of signal conductors leading out from its front end, and a pair of signal pads correspondingly provided in the signal pad area, which are soldered to the same pair of signal conductors respectively.

[0017] Furthermore, in this invention, the grounding pad area in each group of signal pad areas surrounds the corresponding signal pad area, and these grounding pad areas are all connected as one unit.

[0018] The advantages of adopting the technical solution of this utility model are as follows:

[0019] 1. In this utility model, an integrated shielding bracket is added to the PCB. The base is divided into cable mounting grids by partitions. The card plate on the cover cooperates with the card slot on the partition to form an independent shielding cavity at the front end of each cable, effectively avoiding signal crosstalk between adjacent cables. Furthermore, this integrated shielding bracket can shield and block multiple cables at once, eliminating the need to install shielding devices for each cable separately. This makes assembly faster, more efficient, and cost-effective.

[0020] 2. The integrated shielding bracket designed in this utility model is itself grounded, and the grounding of the aluminum foil is completed by directly attaching the base recess to the aluminum foil of the cable. This completes the ground loop coverage of each individual shielding cavity in one go. Compared with conventional technology, there is no need to lead a ground wire out of the aluminum foil for welding, which simplifies assembly and improves assembly efficiency. In addition, the base recess is also provided with bottom protrusions to enhance the contact performance with the aluminum foil.

[0021] 3. Compared with the shielding devices that are currently installed separately on cables, the integrated shielding bracket designed in this utility model will not cause interference problems between adjacent installations and can make full use of the PCB board space.

[0022] 4. In this utility model, an insulating support block is further designed on the integrated shielding bracket. The insulating support block is provided with an arc-shaped groove or an inclined groove for embedding and supporting the signal conductor at the front end of the corresponding cable. The arc-shaped groove or inclined groove can reduce the bending amplitude of the signal conductor, so as to adjust the impedance of the signal conductor and ensure that the impedance between the signal pad and the aluminum foil (grounding layer) is as uniform as possible, thereby reducing signal loss.

[0023] The objectives, advantages, and features of this utility model will be illustrated and explained through the following non-limiting description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0025] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure after the cover is removed;

[0026] Figure 3 for Figure 2 A schematic diagram of the standalone 3D structure of the PCB after removing the base and insulating support;

[0027] Figure 4 A three-dimensional structural diagram of the base and insulating support block in their assembled state;

[0028] Figure 5 This is a schematic diagram of the base's individual three-dimensional structure.

[0029] Figure 6 A schematic diagram of the individual three-dimensional structure of the insulating support block;

[0030] Figure 7 This is a schematic diagram of the individual three-dimensional structure of the cover;

[0031] Figure 8 for Figure 7 A schematic diagram of the three-dimensional structure after being flipped over.

[0032] In the diagram: 1. PCB; 2. Cable; A. Signal pad area; B. Grounding pad area; 3. Signal pad; 4. Aluminum foil; 5. Signal conductor; 6. Base; 601. Partition; 601a. ​​Slot; 601b. Connecting protrusion; 602. Hollowed-out groove; 603. Base recess; 603a. Bottom protrusion; 7. Cover; 701. Card plate; 702. Cover recess; 702a. Top protrusion; 703. Connecting hole; 8. Insulating support block; 801. Arc-shaped support groove. Detailed Implementation

[0033] Example: The following is combined with Figures 1-8 The specific implementation of the anti-crosstalk shielding grounding device for connector cables provided by this utility model is described below:

[0034] Similar to conventional technology, this embodiment includes a PCB 1, with a set of signal pad areas A on its upper and middle sections. The upper set consists of four signal pad areas A arranged side-by-side, while the middle set consists of six signal pad areas A arranged side-by-side. Each signal pad area A is used to connect a corresponding cable 2. Figures 1-3 The image only shows the connection status of two signal pad areas A in the upper group with cable 2; the connection status of the rest is omitted.

[0035] The cable 2 is a conventional differential signal cable, with its outer sheath removed to expose aluminum foil 4 and a pair of signal conductors 5 leading out from the center. Correspondingly, a pair of signal pads 3 are provided within the signal pad area A, each used for soldering the same pair of signal conductors 5. Simultaneously, each group of signal pad areas A on the PCB 1 also has a corresponding ground pad area B, which surrounds the corresponding signal pad area A. These ground pad areas B are all connected as a single unit, as detailed below. Figures 1-3 As shown.

[0036] The core improvements of this utility model are as follows:

[0037] Combination Figures 1-8 As shown, each signal pad area A on PCB1 is provided with an integrated shielding bracket. (Figures 1-1 in this embodiment are shown.) Figure 3 The image only shows the integrated shielding bracket for the upper group. This integrated shielding bracket has a base 6 and a cover 7 that is fastened to the base 6. The bottom of the base 6 is SMT soldered to the grounding pad area B. The base 6 has four cable mounting slots corresponding to each signal pad area A, separated by partitions 601. Each cable mounting slot has a slot 602 at the front for soldering the signal conductor 5 of the cable 2 to the corresponding signal pad 3, and a recessed platform 603 at the rear for embedding the exposed aluminum foil 4 of the cable 2. The cover 7 has a corresponding retaining plate 701 on each partition 601, and the partition 601 has a slot 601a for embedding the retaining plate 701. (Specific details are not provided in the original text.) Figure 4 , Figure 5 and Figure 8 As shown.

[0038] Combined Figures 4-8 As shown, in this embodiment, the inner wall of the base recess 603 is provided with three bottom protrusions 603a for contacting the aluminum foil 4. The bottom protrusions 603a ensure good contact between the base recess 603 and the aluminum foil 4 of the cable 2, improving contact performance. Simultaneously, the cover 7 is provided with a cover recess 702 corresponding to the base recess 603, and the inner wall of the cover recess 702 is also provided with two top protrusions 702a for contacting the aluminum foil 4, which similarly improves the contact performance between the cover recess 702 and the aluminum foil 4.

[0039] In this embodiment, each partition 601 of the base 6 is provided with a connecting protrusion 601b, and the cover 7 is provided with connecting holes 703 that correspond to and fit into the connecting protrusions 601b. The base 6 and the cover 7 are fixed together by inserting the connecting protrusions 601b and connecting holes 703, and then fixed by spot welding.

[0040] In this embodiment, each of the hollowed-out slots 602 is fitted with an insulating support block 8 that abuts against the front end of the base recess 603. The insulating support block 8 has two arc-shaped grooves 801 for embedding and supporting the two signal conductors 5 at the front ends of the corresponding cables 2. The insulating support block 8 is a rubber block, and its arc-shaped grooves 801 enclose the embedded signal conductors 5. See details... Figure 4 and Figure 5 As shown.

[0041] In the above embodiment, an integrated shielding bracket is added to the PCB1. The base 6 is divided into cable mounting grids by partitions 601. The card plate 701 on the cover 7 cooperates with the slot 601a on the partition 601 so that the cable mounting grid forms a separate shielding cavity at the front end of each cable 2, effectively avoiding signal crosstalk between adjacent cables 2. Furthermore, the integrated shielding bracket can shield and block multiple cables 2 at once, eliminating the need to install shielding devices for each cable 2 separately, making assembly faster, more efficient, and cost-effective.

[0042] Furthermore, because the integrated shielding bracket is inherently grounded, and the aluminum foil 4 of the cable 2 is directly bonded to the base recess 603, the grounding of the aluminum foil 4 is completed in one go, thus achieving ground loop coverage for each individual shielding cavity. Compared to conventional technology, there is no need to lead out a ground wire from the aluminum foil 4 for welding, which simplifies assembly and improves assembly efficiency. Additionally, the base recess 603 is provided with bottom protrusions 603a to enhance contact performance with the aluminum foil 4.

[0043] Furthermore, compared to the shielding devices currently installed separately on cable 2, the integrated shielding bracket will not cause interference problems between adjacent installations and can make full use of the board space of PCB1.

[0044] Furthermore, the integrated shielding bracket is designed with an insulating support block 8, which has an arc-shaped groove 801 for embedding and supporting the signal conductor 5 at the front end of the corresponding cable 2. The arc-shaped groove 801 can reduce the bending amplitude of the signal conductor 5 in order to adjust the impedance of the signal conductor 5 and ensure that the impedance between the signal pad 3 and the aluminum foil 4 (grounding layer) is as uniform as possible, thereby reducing signal loss.

[0045] Of course, the above are merely specific application examples of this utility model and do not constitute any limitation on the scope of protection of this utility model. In addition to the above embodiments, this utility model may have other implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by this utility model.

Claims

1. A crosstalk shielding grounding device for connector cables, comprising a PCB (1) and multiple sets of signal pad areas (A) disposed thereon, each set of signal pad areas (A) comprising several signal pad areas (A) arranged side by side, and a cable (2) and a grounding pad area (B) disposed corresponding to each signal pad area (A), a signal pad (3) is provided in the signal pad area (A), and the cable (2) has its outer sheath cut off to expose aluminum foil (4) and a central signal conductor (5) is led out, characterized in that It also includes an integrated shielding bracket set for each group of signal pad areas (A). The integrated shielding bracket includes a base (6) and a cover (7) that is fastened to the base (6). The bottom of the base (6) is soldered to the ground pad area (B) by SMT. The base (6) is separated by partitions (601) into several cable mounting grids corresponding to each signal pad area (A). Each cable mounting grid has a hollow groove (602) at the front for welding the signal conductor (5) of the cable (2) to the corresponding signal pad (3). The rear of the cable mounting grid is a base recess (603) for embedding the exposed aluminum foil (4) of the cable (2). The cover (7) is provided with a card plate (701) that corresponds to the partition (601) one by one, and the partition (601) is provided with a card slot (601a) for embedding the card plate (701).

2. The anti-crosstalk shielding grounding device for connector cables according to claim 1, characterized in that: The inner wall of the base recess (603) is provided with a number of bottom protrusions (603a) for contacting the aluminum foil (4).

3. A crosstalk shielding grounding device for connector cables according to claim 1 or 2, characterized in that: The cover (7) is provided with a cover recess (702) corresponding to the base recess (603), and the inner wall of the cover recess (702) is provided with a number of top protrusions (702a) for contacting the aluminum foil (4).

4. The anti-crosstalk shielding grounding device for connector cables according to claim 1, characterized in that: Each of the partitions (601) of the base (6) is provided with a plurality of connecting protrusions (601b), and the cover (7) is provided with connecting holes (703) that correspond to and fit into the connecting protrusions (601b).

5. A crosstalk shielding grounding device for connector cables according to claim 1 or 4, characterized in that: The base (6) and the cover (7) are fixed together by spot welding.

6. The anti-crosstalk shielding grounding device for connector cables according to claim 1, characterized in that: Each of the hollowed-out slots (602) is fitted with an insulating support block (8) that abuts against the front end of the base recess (603). The insulating support block (8) is provided with an arc-shaped support slot (801) or a slanted support slot for the signal conductor (5) at the front end of the corresponding cable (2) to be embedded and supported.

7. The anti-crosstalk shielding grounding device for connector cables according to claim 6, characterized in that: The insulating block (8) is a rubber block, on which the signal conductor (5) is wrapped by an arc-shaped groove (801) or a slanted groove.

8. A crosstalk shielding grounding device for connector cables according to claim 1, 6, or 7, characterized in that: The cable (2) is a differential signal cable, with a pair of signal conductors (5) leading out from its front end, and a pair of signal pads (3) are correspondingly provided in the signal pad area (A), which are soldered to the same pair of signal conductors (5).

9. The anti-crosstalk shielding grounding device for connector cables according to claim 1, characterized in that: The ground pad area (B) in each group of signal pad areas (A) surrounds the corresponding signal pad area (A), and these ground pad areas (B) are all connected as one unit.

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