High-speed card edge connector

Abstract

The utility model discloses a high-speed card edge connector, which comprises a plastic cement main body, a terminal group, a grounding strip and a rear cover, and is characterized in that the plastic cement main body comprises a first plastic cement main body and a second plastic cement main body, and the first plastic cement main body and the second plastic cement main body are respectively provided with a first slot and a second slot; the terminal group comprises a plurality of contact terminals arranged on the two sides of the first slot and power supply terminals arranged on the two sides of the second slot; each row of contact terminals comprises signal terminals and grounding terminals which are arranged at intervals; the grounding strip comprises a plurality of shielding plates covering the signal terminals and connecting arms connected with the grounding terminals; the rear cover is installed at the bottom of the first plastic main body, welding grooves are formed in the side walls of the two long edges of the rear cover, a plurality of fixing clamping positions used for limiting the tin wires to facilitate subsequent welding of the contact terminal and the high-speed cable are formed, and the problem that the tin wires are difficult to position in the welding process is solved through the fixing clamping positions. And the welding quality, the welding yield and the welding efficiency between the contact terminal and the high-speed cable are effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrical connectors, and particularly relates to a high-speed card-edge connector. Background Art

[0002] In the field of modern electronic engineering, a card-edge connector is a key component for achieving fast and efficient electrical connection between the edge of a printed circuit board and external devices. The structural feature of this connector is that its terminals are arranged along the edge of the circuit board, enabling the connector to directly connect to the conductive paths of the circuit board, thereby reducing the space required for connection and simplifying the assembly process. Card-edge connectors are widely used to connect expansion cards inside electronic devices to the motherboard. These expansion cards may include high-performance components such as graphics processing units, network cards, and storage controller cards. Through the PCIe interface, these expansion cards can achieve high-speed data transmission to meet the requirements of modern computer systems for large bandwidth and low latency. In addition, card-edge connectors are also widely used in data centers, servers, and industrial automation fields to connect various high-speed interface devices.

[0003] The structure of a card-edge connector mainly includes a longitudinally extending insulating body and a series of closely arranged conductive terminals housed in the insulating body. The insulating body usually has opposite side walls that form a central slot for receiving and guiding the insertion of the edge of the expansion card. One end of the contact terminal of the card-edge connector is an elastic contact arm, and these contact arms can provide sufficient pressure during insertion to ensure stable electrical contact with the expansion card. The other end of the contact terminal is a pin. When welding with a high-speed cable, a corresponding length of solder wire is usually used for welding by means of high-temperature HUB soldering. During the welding process, precise placement is required to ensure good electrical connection. First, the solder wire needs to be cut into the required length, and the appropriate length of solder wire needs to be placed at the correct position of the product to be welded. However, due to the certain length and soft material of the solder wire itself, it is easy to bend, which makes it difficult to position the solder wire. The solder wire is likely to run out of the required welding position during the welding process, affecting the welding quality, yield, and efficiency. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a high-speed card-edge connector to solve the deficiencies of the prior art.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A high-speed card-edge connector includes a plastic body, a terminal group, a grounding bar, and a rear cover. The plastic body includes a first plastic body and a second plastic body embedded in the first plastic body. The first plastic body and the second plastic body are respectively provided with a first slot and a second slot, and the first slot and the second slot are on the same straight line for an expansion card to be inserted. The terminal group includes a number of contact terminals arranged on both sides of the first slot and power terminals arranged on both sides of the second slot. Each row of contact terminals includes signal terminals and grounding terminals arranged at intervals. The grounding bar is arranged close to the contact terminals and includes a plurality of shielding plates covering the signal terminals on the same side and connecting arms for corresponding connection with the grounding terminals on the same side one by one. The rear cover is installed at the bottom of the first plastic body, and welding grooves for the pins of the contact terminals to extend out are formed on the two long side walls of the rear cover, and a plurality of fixing positions for limiting the solder wire are formed to facilitate subsequent welding of the contact terminals to a high-speed cable.

[0007] Further, the fixing positions are evenly arranged at intervals along the welding path of the contact terminals and the high-speed cable.

[0008] Further, each fixing position includes two symmetrically arranged card arms, and a fixing groove for limiting the solder wire is formed between the two card arms.

[0009] Further, a plastic holding member for fixing the relative positions of the signal terminals and the grounding terminals is formed by insert molding at the holding part of each row of contact terminals.

[0010] Further, the plastic holding member is provided with a fastening part, and a bayonet matching the fastening part is formed on the side wall of the plastic body.

[0011] Further, the plastic holding member is also provided with positioning protrusions matching the positioning holes on the shielding plate.

[0012] Further, the connecting arm includes two symmetrically arranged welding pieces, and the two welding pieces are welded to the holding part of the same grounding terminal.

[0013] Further, connection seats are also provided at both ends of the first plastic body, and fixing holes are formed in the connection seats.

[0014] Further, it is characterized in that: positioning posts and fixing pieces for accurately fixing the first plastic body on the main board are also provided at the bottom of the first plastic body.

[0015] Compared with the prior art, the beneficial technical effects of the high-speed card-edge connector provided by the present utility model are as follows:

[0016] 1. By forming a number of fixed clamping positions that are arranged at intervals and protrude upward on the outer surface of the rear cover to form a fixed groove capable of placing and fixing the soft solder wire, the problem of poor positioning of the solder wire during the welding process is solved, effectively improving the welding quality, welding yield and welding efficiency between the contact terminal and the high-speed cable.

[0017] 2. By adopting the process of insert injection molding, the contact terminal is formed into an integral body, which not only makes the welding process simpler, improves the production efficiency, but also makes the contact more stable, has higher reliability, and is convenient for the miniaturization of the product.

[0018] The following further describes in detail the specific embodiments of the present invention with reference to the accompanying drawings. Description of the Drawings

[0019] The following drawings in the description are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0020] Figure 1 is a front structural schematic diagram of a high-speed card edge connector provided by an embodiment of the present invention;

[0021] Figure 2 is a rear structural schematic diagram of a high-speed card edge connector provided by an embodiment of the present invention;

[0022] Figure 3 is an exploded view of a high-speed card edge connector provided by an embodiment of the present invention;

[0023] Figure 4 is an internal structural schematic diagram of a high-speed card edge connector provided by an embodiment of the present invention;

[0024] Figure 5 is a partial enlarged schematic diagram of the fixing method of the contact terminal in a high-speed card edge connector provided by an embodiment of the present invention;

[0025] Figure 6 is a cross-sectional view of a high-speed card edge connector provided by an embodiment of the present invention;

[0026] Figure 7 is a structural schematic diagram of the grounding bar in a high-speed card edge connector provided by an embodiment of the present invention;

[0027] Figure 8 is a structural schematic diagram of the rear cover in a high-speed card edge connector provided by an embodiment of the present invention;

[0028] Figure 9 is a structural schematic diagram of the signal terminal in a high-speed card edge connector provided by an embodiment of the present invention;

[0029] Figure 10 This is a schematic structural diagram of a grounding terminal in a high-speed card-edge connector provided by an embodiment of the present utility model.

[0030] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0031] 1 - First plastic body, 101 - First slot, 102 - Connection seat, 103 - Positioning post, 104 - Fixed piece, 105 - Bayonet, 2 - Second plastic body, 201 - Second slot, 3 - Contact terminal, 301 - Signal terminal, 3011 - First holding part, 3012 - First pin, 3013 - First terminal body, 3014 - First contact part, 302 - Grounding terminal, 3021 - Second holding part, 3022 - Second pin, 3023 - Second terminal body, 3024 - Second contact part, 4 - Power terminal, 5 - Grounding bar, 501 - Shielding plate, 502 - Welding piece, 503 - Positioning hole, 6 - Rear cover, 601 - Welding groove, 602 - Clamping arm, 7 - Plastic retainer, 701 - Buckling part, 702 - Positioning bump, 8 - High-speed cable, 9 - Solder wire. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0033] An embodiment of the present utility model provides a high-speed card-edge connector, including a plastic body, a terminal group, a grounding bar 5, and a rear cover 6. Specifically:

[0034] As Figures 1 to 3As shown, in this embodiment, the plastic body serves as the installation base of the entire connector, including a first plastic body 1 and a second plastic body 2 embedded in the first plastic body 1. The first plastic body 1 and the second plastic body 2 are respectively provided with a first slot 101 and a second slot 201. The first slot 101 and the second slot 201 are on the same straight line for the expansion card to be inserted. Both ends of the first plastic body 1 are provided with connection seats 102. Fixing holes are provided in the connection seats 102. Correspondingly, mounting holes matching the fixing holes are provided on the main board. The first plastic body 1 is mounted on the main board through bolts and nuts. Further, in order to improve the installation accuracy of the first plastic body 1, positioning posts 103 and fixing pieces 104 are also fixedly provided at the bottom of the first plastic body 1. The positioning posts 103 serve as positioning references, which can assist the assembler to quickly align the first plastic body 1 with the main board. Then, the fixing piece 104 is inserted into the corresponding jack on the main board and welded, and the first plastic body 1 can be accurately fixed on the main board.

[0035] The terminal group includes a plurality of contact terminals 3 and a plurality of power terminals 4. The power terminals 4 are arranged in the terminal mounting grooves on both sides of the second slot 201 for supplying power to the expansion card. The contact terminals 3 are arranged in the terminal mounting grooves on both sides of the first slot 101 for transmitting data. Each row of contact terminals 3 includes a plurality of signal terminals 301 arranged at intervals and a ground terminal 302. The contact terminal 3 includes a holding part, a pin, a terminal body, and an elastic contact part (refer to the attached Figure 9 and Figure 10 , the signal terminal 301 includes a first holding part 3011, a first pin 3012, a first terminal body 3013, and a first contact part 3014; the ground terminal 302 includes a second holding part 3021, a second pin 3022, a second terminal body 3023, and a second contact part 3024). The contact terminal 3 is integrally formed. The holding part of the contact terminal 3 is clamped in the terminal mounting groove of the first plastic body 1 to fix the entire contact terminal 3. The pin is arranged below the holding part and extends downward, exposed outside the bottom of the first plastic body 1. The terminal body is arranged above the holding part and extends into the first slot 101. The elastic contact part is arranged at the end of the terminal body for contacting and conducting with the expansion card.

[0036] As Figures 3 to 7As shown, the grounding bar 5 is disposed on the front side of the contact terminal 3 (i.e., the side opposite to the elastic contact portion of the contact terminal 3), and includes a plurality of shielding plates 501 and connecting arms for connecting to the grounding terminals 302 on the same side in one-to-one correspondence. The length of the shielding plate 501 is not less than the outer margin of each pair of signal terminals 301, and the width of the shielding plate 501 is the same as the length of the holding portion of the signal terminal 301, so that the shielding plate 501 can just cover the holding portion of each pair of signal terminals 301 on the same side to block and absorb electromagnetic waves and reduce the influence of external electromagnetic interference on the signal. The connecting arm includes two welding pieces 502 symmetrically arranged up and down, and the two welding arms are welded to the holding portion of the same grounding terminal 302. By electrically connecting the plurality of grounding terminals 302 through the grounding bar 5, a more stable and uniform reference plane can be formed, thereby effectively reducing the resonance between the differential signal terminals 301 and improving the signal integrity during high-frequency and high-speed signal transmission. Of course, the grounding bar 5 can also be disposed on the back side of the contact terminal 3, with a better anti-resonance effect, which can more effectively reduce the mutual interference between signals inside the connector and improve the high-frequency performance of the edge connector.

[0037] As Figures 4 to 8 shown, in this embodiment, the rear cover 6 is installed at the bottom of the first plastic body 1 by press-fitting, which can protect the contact points inside the connector, reduce the influence of external environmental factors such as dust and moisture, and extend the service life of the connector. A row of welding grooves 601 are respectively formed on the two long side walls of the rear cover 6, so that the pins of the contact terminal 3 can extend out for welding with the high-speed cable 8. A plurality of fixing positions for limiting the solder wire 9 are formed on the outer surface of the rear cover 6, and the fixing positions are evenly spaced along the welding path of the contact terminal 3 and the high-speed cable 8. Each fixing position includes two symmetrically arranged clamping arms 602, and the distance between the two clamping arms 602 is slightly larger than the outer diameter of the solder wire 9, thereby forming a fixing groove for placing and fixing the soft solder wire 9.

[0038] As Figures 3 to 6 shown, as a preferred embodiment, a plastic holding member 7 is further provided at the holding portion of each row of contact terminals 3 by insert molding process, which can wrap and protect the non-welding positions of the holding portions of the contact terminals 3, so that each row of contact terminals 3 forms a whole, improving the structural strength and stability of the connector. In addition, the outer surface of the plastic holding member 7 is provided with an outwardly protruding fastening portion 701 and a positioning protrusion. Correspondingly, a bayonet 105 matching the fastening portion 701 is formed on the side wall of the first plastic body 1, and the contact terminal 3 is fastened and installed in the first plastic body 1 through the plastic holding member 7; a positioning hole 503 matching the positioning protrusion 702 is formed on the shielding plate 501 of the grounding bar to ensure the welding accuracy of the grounding bar 5 and the grounding terminal 302.

[0039] During assembly, first assemble the fixing piece 104 into the plastic main body 1. Then, form the arranged signal terminals 301 and ground terminals 302 into a whole by insert molding. Next, weld the grounding strip 5 to the multiple ground terminals 302, and snap the welded terminal assembly into the first plastic main body 1. Then, plug in the rear cover 6. After that, break the solder wire 9 into the required length and snap the solder wire 9 into the fixing groove for fixation, which can effectively solve the problem of poor positioning of the solder wire 9 during the welding process, and greatly improve the welding quality, welding yield and welding efficiency between the contact terminal 3 and the high-speed cable 8.

[0040] The above-described embodiments only represent the implementation manners of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. A high-speed card edge connector, characterized in that: include: A plastic body, comprising a first plastic body (1) and a second plastic body (2) embedded in the first plastic body (1), wherein the first plastic body (1) and the second plastic body (2) are respectively provided with a first slot (101) and a second slot (201), and the first slot (101) and the second slot (201) are located on the same straight line for plugging an expansion card; A terminal group, comprising a plurality of contact terminals (3) arranged on both sides of the first slot (101) and power terminals (4) arranged on both sides of the second slot (201); each row of contact terminals (3) comprises signal terminals (301) and ground terminals (302) arranged at intervals; A grounding strip (5) disposed near the contact terminal (3), comprising a plurality of shielding plates (501) covering the signal terminals (301) on the same side and connecting arms for connecting to the grounding terminals (302) on the same side in a one-to-one correspondence; The back cover (6) is mounted on the bottom of the first plastic body (1), and the two long side walls of the back cover (6) are provided with welding grooves (601) for the pins of the contact terminals (3) to extend out, and are formed with a plurality of fixed positions for limiting the position of the tin wire (9) to facilitate the subsequent welding of the contact terminals (3) and the high-speed cables (8).

2. A high-speed card edge connector according to claim 1, characterized in that: The fixed clamping positions are evenly spaced along the welding path between the contact terminal (3) and the high-speed cable (8).

3. The high-speed card edge connector according to claim 1, characterized in that: Each fixed clamping position comprises two clamping arms (602) arranged in mirror symmetry, and a fixed groove capable of limiting the position of the tin wire (9) is formed between the two clamping arms (602).

4. The high-speed card edge connector according to claim 1, characterized in that: A plastic retaining piece (7) for fixing the relative positions of the signal terminal (301) and the ground terminal (302) is formed at the retaining portion of each row of contact terminals (3) using an insert injection molding process.

5. A high-speed card edge connector according to claim 4, characterized in that: The plastic retaining member (7) is provided with a buckling portion (701), and the side wall of the plastic body is provided with a bayonet (105) that matches the buckling portion (701).

6. A high-speed card edge connector according to claim 4, characterized in that: The plastic retaining member (7) is also provided with a positioning protrusion (702) that matches the positioning hole (503) on the shielding plate (501).

7. The high-speed card edge connector according to claim 1, characterized in that: The connecting arm comprises two symmetrically arranged welding plates (502), and the two welding plates (502) are welded to the retaining portion of the same grounding terminal (302).

8. A high-speed card edge connector according to any one of claims 1 to 7, characterized in that: Connecting seats (102) are also provided at both ends of the first plastic body (1), and fixing holes are provided in the connecting seats (102).

9. A high-speed card edge connector according to any one of claims 1 to 7, characterized in that: The bottom of the first plastic body (1) is also provided with a positioning column (103) and a fixing plate (104) for accurately fixing the first plastic body (1) on the main board.

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