High-speed card edge connector

Abstract

The utility model discloses a high-speed card edge connector, which comprises a plastic main body, a terminal group and a grounding strip, and is characterized in that the plastic main body is provided with a first slot and a second slot for a second circuit board to insert; 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 is arranged close to the contact terminal and comprises a shielding plate and a connecting arm. According to the utility model, the grounding strip is connected with the plurality of grounding terminals, so that the resonance between the two pairs of differential signal terminals is effectively reduced, the transmission quality and performance reliability of high-frequency and high-speed signals are improved, and the high-frequency performance of the card edge connector is improved. And the contact terminals are molded into a whole by adopting an insert injection molding process, so that the welding process is simpler, the production efficiency is improved, the contact is more stable, the reliability is higher, and the miniaturization of products is facilitated.

Description

Technical Field

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

[0002] In the field of modern electronic engineering, the 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, allowing the connector to be directly connected to the conductive path of the circuit board, thereby reducing the space required for the connection and simplifying the assembly process. Card edge connectors are widely used to connect expansion cards inside the computer 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 needs 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 to connect various high-speed interface devices.

[0003] The card edge connector includes a series of closely arranged contact pieces, one end of which is fixed on the body of the connector and the other end extends to the edge of the circuit board to form a reliable electrical contact with the corresponding conductive area on the circuit board. In order to ensure the integrity and stability of the signal, the card edge connector usually includes a number of grounding terminals and a number of pairs of differential signal terminals for transmitting differential signals. The grounding terminals and the differential signal terminals are usually arranged in a row together for easy insertion and connection. However, with the rapid development of the fifth generation mobile communication technology (5G), higher requirements are placed on the transmission speed of electronic devices. The deployment of 5G networks has promoted the demand for high data rates, low latency and large capacity, which has brought new challenges to the design and performance of connectors. In the context of high-frequency and high-speed signal transmission, the design of existing card edge connectors is prone to crosstalk and resonance problems, especially when the conductive terminals are densely arranged together, the crosstalk and resonance problems between them may become particularly significant, affecting the quality and reliability of the high-frequency and high-speed signal transmission of the card edge connector.

[0004] Therefore, in order to meet the high-speed and anti-interference transmission requirements in the 5G era, it is necessary to improve and optimize the existing card edge connectors. Utility Model Content

[0005] The utility model aims to provide a high-speed card edge connector to solve the deficiencies of the prior art.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A high-speed card edge connector includes a plastic body, a terminal group and a grounding strip, wherein 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 located in the same straight line for plugging in a second circuit board; the terminal group includes a plurality 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 strip 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 correspondingly connecting to the grounding terminals on the same side.

[0008] Furthermore, the contact terminal includes retaining portions located in terminal mounting grooves on both sides of the first slot, pins extending out of the bottom of the first plastic body, a terminal body extending into the first slot, and an elastic contact portion arranged at the end of the terminal body.

[0009] Furthermore, the length of the shielding plate is not less than the outer margin of each pair of signal terminals, and the width of the shielding plate is the same as the length of the retaining portion of the signal terminal.

[0010] Furthermore, the connecting arm includes two welding plates symmetrically arranged up and down, and the two welding plates are welded to the retaining portion of the same ground terminal.

[0011] Furthermore, a plastic block is provided at the retaining portion of each row of contact terminals by means of insert injection molding technology, a buckling portion is further provided on the plastic block, and a bayonet matched with the buckling portion is provided on the side wall of the plastic body.

[0012] Furthermore, the width of the terminal body of the signal terminal is greater than the width of the terminal body of the ground terminal, and the inner margin between the terminal bodies of two adjacent signal terminals is smaller than the inner margin between the terminal bodies of the adjacent signal terminal and the ground terminal.

[0013] Furthermore, the connecting arm is a contact piece elastically contacted with the retaining portion of the ground terminal.

[0014] Furthermore, it also includes a back cover, which is installed on the bottom of the first plastic body, and the back cover is provided with two rows of through holes for the pins of the contact terminals to extend out.

[0015] Furthermore, connecting seats are provided at both ends of the first plastic body, and fixing holes are provided in the connecting seats.

[0016] Furthermore, a positioning column and a fixing sheet for accurately fixing the first plastic body on the first circuit board are also provided at the bottom of the first plastic body.

[0017] Compared with the prior art, the high-speed card edge connector provided by the utility model has the following beneficial technical effects:

[0018] The utility model effectively reduces the resonance between two pairs of differential signal terminals by connecting the grounding strip with a plurality of grounding terminals, improves the quality and performance reliability of high-frequency and high-speed signal transmission, and enhances the high-frequency performance of the card edge connector. In addition, the contact terminals are formed into a whole by adopting the insert injection molding process, which not only simplifies the welding process and improves the production efficiency, but also makes the contact more stable and reliable, and facilitates the miniaturization of the product.

[0019] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described below are only some embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure of a high-speed card edge connector provided in Embodiment 1 of the present utility model;

[0022] Figure 2 A schematic diagram of the working state of a high-speed card edge connector provided in the first embodiment of the utility model;

[0023] Figure 3 An exploded view of a high-speed card edge connector provided in Embodiment 1 of the present utility model;

[0024] Figure 4 A partially enlarged schematic diagram of a contact terminal and a connecting strip in a high-speed card edge connector provided in the first embodiment of the utility model;

[0025] Figure 5 A cross-sectional view of a high-speed card edge connector provided by the first embodiment of the present utility model when a grounding strip is arranged on the front side of a contact terminal;

[0026] Figure 6 A cross-sectional view of a high-speed card edge connector provided by the first embodiment of the present utility model when a grounding strip is arranged on the back side of a contact terminal;

[0027] Figure 7 A schematic diagram of the structure of a grounding strip in a high-speed card edge connector provided in the first embodiment of the utility model;

[0028] Figure 8 A schematic diagram of the structure of a signal terminal in a high-speed card edge connector provided in Embodiment 1 of the utility model;

[0029] Fig. 9 A schematic diagram of the structure of a grounding terminal in a high-speed card edge connector provided in Embodiment 1 of the present utility model;

[0030] Fig.10 An exploded view of a high-speed card edge connector provided in Embodiment 2 of the present utility model;

[0031] Fig.11 A partial enlarged schematic diagram of a contact terminal and a connecting strip in a high-speed card edge connector provided in the second embodiment of the utility model;

[0032] Fig.12 A cross-sectional view of a high-speed card edge connector provided in Embodiment 2 of the present utility model;

[0033] Fig.13 This is a schematic structural diagram of a grounding strip in a high-speed card edge connector provided in Embodiment 2 of the present utility model.

[0034] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0035] 1-first plastic body, 101-first slot, 102-connecting seat, 103-positioning column, 104-fixing plate, 105-bayonet, 2-second plastic body, 201-second slot, 3-contact terminal, 301-signal terminal, 3011-first holding portion, 3012-first pin, 3013-first terminal body, 3014-first contact portion, 302-grounding terminal, 3021-second holding portion, 3022-second pin, 3023-second terminal body, 3024-second contact portion, 4-power terminal, 5-grounding bar, 501-shielding plate, 502-welding plate, 503-abutting plate, 6-back cover, 601-through hole, 7-plastic block, 701-fastening portion, 8-first circuit board, 9-second circuit board. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] Embodiment 1:

[0038] The embodiment of the utility model provides a high-speed card edge connector, comprising a plastic body, a terminal group, a grounding strip 5 and a rear cover 6. Specifically:

[0039] like Figures 1 to 3As shown, in this embodiment, the plastic body serves as the mounting base of the entire connector, and includes 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, and the first slot 101 and the second slot 201 are on the same straight line for the second circuit board 9 to be plugged in; the first plastic body 1 is provided with a connecting seat 102 at both ends, and a fixing hole is provided in the connecting seat 102. Correspondingly, the first circuit board 8 is provided with a mounting hole that matches the fixing hole, and the first plastic body 1 is mounted on the first circuit board 8 by bolts and nuts. Further, in order to improve the installation accuracy of the first plastic body 1, a positioning column 103 and a fixing plate 104 are also fixed at the bottom of the first plastic body 1. The positioning column 103 is used as a positioning reference to assist the assembler to quickly align the first plastic body 1 with the first circuit board 8, and then the fixing plate 104 is inserted into the corresponding jack of the first circuit board 8 and welded and fixed, so that the first plastic body 1 can be accurately fixed on the first circuit board 8.

[0040] 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 installation slots on both sides of the second slot 201 for supplying power to the second circuit board 9. The contact terminals 3 are arranged in the terminal installation slots on both sides of the first slot 101 for transmitting data. Each row of contact terminals 3 includes a plurality of signal terminals 301 and ground terminals 302 arranged at intervals. The contact terminals 3 include a retaining portion, a pin, a terminal body, and an elastic contact portion (see Appendix 1). Figure 8 and Fig. 9 The signal terminal 301 includes a first retaining portion 3011, a first pin 3012, a first terminal body 3013 and a first contact portion 3014; the ground terminal 302 includes a second retaining portion 3021, a second pin 3022, a second terminal body 3023 and a second contact portion 3024). The contact terminal 3 is integrally formed, and the retaining portion 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 retaining portion and extends downward, exposed outside the bottom of the first plastic body 1, the terminal body is arranged above the retaining portion and extends into the first slot 101; the elastic contact portion is arranged at the end of the terminal body, and is used to contact and conduct with the second circuit board 9.

[0041] In order to further improve the anti-interference ability of the connector, such as Figure 4As shown, as a preferred embodiment, the width of the first terminal body 3013 of the signal terminal 301 is greater than the width of the second terminal body 3023 of the ground terminal 302 (i.e., d1>d2), thereby increasing the current carrying capacity of the signal terminal 301, reducing energy loss during signal transmission, improving signal transmission efficiency and reducing crosstalk. In addition, the inner margin between two adjacent first terminal bodies 3013 is smaller than the inner margin between the adjacent first terminal body 3013 and the second terminal body 3023 (i.e., D1<D2), and by shortening the gap between two adjacent differential signal terminals 301, the coupling effect between differential signals during signal transmission is enhanced, thereby enhancing the anti-noise capability and improving the transmission rate.

[0042] like Figures 3 to 7 As shown, the grounding strip 5 is arranged 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 one-to-one with the grounding terminals 302 on the same side. 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 retaining portion of the signal terminal 301, so that the shielding plate 501 can just cover the retaining 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 plates 502 symmetrically arranged up and down, and the two welding arms are welded to the retaining portion of the same grounding terminal 302. By electrically conducting the multiple grounding terminals 302 through the grounding strip 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, as Figure 6 As shown, the grounding strip 5 can also be arranged on the back of the contact terminal 3, which has a better anti-resonance effect, can more effectively reduce the mutual interference between the internal signals of the connector, and improve the high-frequency performance of the card edge connector. The back cover 6 is installed on 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. The back cover 6 is also provided with two rows of through holes 601, so that the pins of the contact terminal 3 can be extended to be welded with the first circuit board 8.

[0043] like Figures 3 to 6As shown, further, a plastic block 7 is provided at the holding part of each row of contact terminals 3 by using the insert injection molding process, which can wrap and protect the non-welding points of the holding part of the contact terminals 3, so that each row of contact terminals 3 forms a whole, thereby improving the structural strength and stability of the connector. In addition, a buckle part 701 is also provided on the plastic block 7, and correspondingly, a bayonet 105 matching the buckle part 701 is provided on the side wall of the first plastic body 1. During assembly, it is only necessary to firstly form the arranged signal terminals 301 and grounding terminals 302 into a whole by using the insert injection molding process, then weld the grounding strip 5 with the multiple grounding terminals 302, and clamp the welded terminal assembly into the first plastic body 1, and finally plug the back cover 6, so as to complete the assembly of the contact terminals 3, which not only makes the welding process simpler and improves the production efficiency, but also makes the contact more stable, the reliability is higher, and it is convenient for the miniaturization of the product.

[0044] Embodiment 2:

[0045] like Figures 10 to 13 As shown, compared with the first embodiment, the difference is that in this embodiment, the connecting arm of the grounding strip 5 is a contact piece 503 with a certain elasticity, and the contact piece 503 elastically contacts the outer surface of the holding portion of the grounding terminal 302. Compared with the welding fixation method, the spring piece contact method provided in this embodiment is convenient for disassembly and assembly, can provide more stable contact pressure, and helps to maintain a good electrical connection.

[0046] The above-mentioned embodiments only express the implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached 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 a second circuit board (9); 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; The grounding strip (5) is arranged close to the contact terminal (3), and comprises a plurality of shielding plates (501) covering the signal terminals (301) on the same side, and connecting arms for being connected to the grounding terminals (302) on the same side in a one-to-one correspondence.

2. A high-speed card edge connector according to claim 1, characterized in that: The contact terminal (3) comprises a retaining portion located in a terminal installation groove on both sides of the first slot (101), a pin extending out of the bottom of the first plastic body (1), a terminal body extending into the first slot (101), and an elastic contact portion arranged at the end of the terminal body.

3. A high-speed card edge connector according to claim 2, characterized in that: 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 retaining portion of the signal terminal (301).

4. A high-speed card edge connector according to claim 2, characterized in that: The connecting arm comprises two welding plates (502) symmetrically arranged up and down, and the two welding plates (502) are welded to the retaining portion of the same grounding terminal (302).

5. A high-speed card edge connector according to claim 4, characterized in that: A plastic block (7) is provided at the retaining portion of each row of contact terminals (3) by means of an insert injection molding process, the plastic block (7) is also provided with a buckle portion (701), and a bayonet (105) matching the buckle portion (701) is provided on the side wall of the plastic body.

6. A high-speed card edge connector according to claim 4, characterized in that: The width of the terminal body of the signal terminal (301) is greater than the width of the terminal body of the ground terminal (302), and the inner margin between the terminal bodies of two adjacent signal terminals (301) is smaller than the inner margin between the terminal bodies of the adjacent signal terminals (301) and the terminal body of the ground terminal (302).

7. The high-speed card edge connector according to claim 2, characterized in that: The connecting arm is a contact piece (503) elastically contacting the retaining portion of the ground terminal (302).

8. The high-speed card edge connector according to claim 1, characterized in that: It also comprises a rear cover (6), the rear cover (6) being mounted on the bottom of the first plastic body (1), and the rear cover (6) being provided with two rows of through holes (601) for the pins of the contact terminals (3) to extend out.

9. A high-speed card edge connector according to any one of claims 1 to 8, 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).

10. A high-speed card edge connector according to any one of claims 1 to 8, characterized in that: A positioning column (103) and a fixing plate (104) are also provided at the bottom of the first plastic body (1) for accurately fixing the first plastic body (1) on the first circuit board (8).

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