A backplane connector

Abstract

The utility model provides a backboard connector belongs to connecting device field, this backboard connector includes insulator, sets up signal terminal and ground shield piece on insulator, signal terminal sets up in differential pair form, differential pair is arranged along the longitudinal direction array on the insulator, signal terminal includes the signal fish eye of plug -in part and the one end of plug -in part, each differential pair is all configured with the shielded cavity surrounded by ground shield piece, two plug -in parts in the same differential pair are located in the same shielded cavity, the shielded cavity has the symmetry axis of longitudinal extension and the symmetry axis of lateral extension, the center of two plug -in parts in the same differential pair is located on both sides of the symmetry axis of longitudinal extension, also is located on both sides of the symmetry axis of lateral extension, two plug -in parts are centrally symmetric arrangement with the intersection point of two symmetry axes as the center. The utility model improves the shielding effect of backboard connector.

Description

Technical Field

[0001] This utility model belongs to the field of connection devices, and in particular relates to a backplate connector. Background Technology

[0002] High-speed differential backplane connectors are used for high-speed interconnection between backplanes and daughterboards, enabling complete transmission of high-speed signals. To improve crosstalk, the connector is typically equipped with a grounding shield that forms a semi-enclosed space for the differential pair. The opening on one side of the grounding shield is closed by an adjacent grounding shield, thus forming a shielding cavity together with the adjacent grounding shield, and the differential pair is located in the corresponding shielding cavity.

[0003] Chinese invention patent application CN110087383A discloses an electrical connector system with PCB connector footprints. One of the connectors in the electrical connector system is a plug connector. The differential pair in the plug connector is centrally arranged in the corresponding shielding cavity. The two signal terminals in the same differential pair are arranged on both sides of the longitudinally extending axis of symmetry of the shielding cavity and along the transversely extending axis of symmetry of the shielding cavity.

[0004] In existing plug connectors, the distance between the signal terminals and the sidewalls of the shielding cavity is relatively large, and the grounding shielding effect on the signal terminals is poor. As signal transmission speeds increase, signal crosstalk in connectors will become increasingly apparent, thus requiring improvements to the connectors to enhance their shielding effectiveness. Utility Model Content

[0005] The purpose of this invention is to provide a backplane connector to solve the technical problem of poor shielding effect of backplane connectors in the prior art.

[0006] To achieve the above objectives, the technical solution for the backplane connector provided by this utility model is as follows:

[0007] A backplane connector includes an insulator, signal terminals disposed on the insulator, and a grounding shield. The signal terminals are arranged in differential pairs, which are arrayed along the longitudinal and transverse directions on the insulator. Each signal terminal includes a plug portion and a signal fisheye located at one end of the plug portion. Each differential pair is configured with a shielding cavity surrounded by the grounding shield. The two plug portions in the same differential pair are located in the same shielding cavity. The shielding cavity has a longitudinally extending axis of symmetry and a transversely extending axis of symmetry. The centers of the two plug portions in the same differential pair are located on both sides of the longitudinally extending axis of symmetry and also on both sides of the transversely extending axis of symmetry. The two plug portions are arranged in a centrally symmetrical manner with the intersection of the two axes of symmetry as the center.

[0008] As a further improvement, the distance from the plug to the longitudinal adjacent wall of the shielding cavity is smaller than the distance from the plug to the transverse adjacent wall of the shielding cavity.

[0009] As a further improvement, the distance from the plug to the laterally extending axis of symmetry is less than the distance from the plug to the longitudinally extending axis of symmetry.

[0010] As a further improvement, the signal fisheye is centered at the corresponding end of the connector.

[0011] As a further improvement, the tilt angles of the fisheye lines connecting the two signals in each differential pair are equal, and the tilt directions are the same.

[0012] As a further improvement, in each longitudinally arranged difference pair, there are two difference pairs with the same tilt angle but opposite directions of the signal fisheye connection.

[0013] As a further improvement, the signal fisheyes are longitudinally eccentrically arranged at the corresponding ends of the plug, and the signal fisheyes on the two signal terminals in the same differential pair are both located on the symmetrical axis of the transverse extension of the shielding cavity.

[0014] As a further improvement, one side of the grounding shield is open and forms a semi-enclosed structure for the corresponding differential pair. The opening of the grounding shield is closed by an adjacent grounding shield of the same structure, and the grounding shield and the adjacent grounding shield together form a shielding cavity.

[0015] As a further improvement, the grounding shield includes a semi-enclosed shield with an opening on one side that forms a semi-enclosed structure for the corresponding differential pair. The grounding shield also includes a flat shield for closing the opening of the semi-enclosed shield. The semi-enclosed shield and the flat shield together form a shielding cavity.

[0016] As a further improvement, the grounding shield is a cylindrical shield capable of forming a fully enclosed structure for the differential pair, with the cylindrical shield itself forming a shielding cavity.

[0017] The beneficial effects are as follows: The backplane connector provided by this utility model is an improvement on the prior art. Compared with the prior art, this backplane connector shifts the insertion portions of the two signal terminals in the same differential pair longitudinally to both sides of the symmetrical axis of the transverse extension of the shielding cavity, thereby bringing the insertion portions closer to one side wall of the longitudinal direction of the shielding cavity, improving the shielding effect, reducing crosstalk during high-speed signal transmission, and utilizing the space inside the shielding cavity to maintain a certain distance between the insertion portions of the signal terminals and the transverse side wall of the shielding cavity, so that there is enough space at the corresponding position to accommodate the corresponding terminals in the adapter connector. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the backplate connector in this utility model;

[0019] Figure 2This is a top view of Embodiment 1 of the backplate connector in this utility model;

[0020] Figure 3 This is a bottom view of Embodiment 1 of the backplate connector of this utility model without the insulator.

[0021] Figure 4 This is a schematic diagram showing the arrangement of two signal terminals in a single differential pair of Embodiment 1 of the backplane connector in this utility model.

[0022] Figure 5 This is a schematic diagram of the printed circuit board used to mount the backplane connector in Embodiment 1 of the present invention.

[0023] Figure 6 This is a schematic diagram of the structure of a printed circuit board used for mounting the backplane connector in Embodiment 1 of the present invention.

[0024] Figure 7 This is a schematic diagram of the cylindrical shielding component in Embodiment 3 of the backplate connector of this utility model;

[0025] Figure 8 This is a schematic diagram of the overall structure of Embodiment 3 of the backplate connector in this utility model;

[0026] Figure 9 This is a top view of embodiment 3 of the backplate connector in this utility model;

[0027] Figure 10 This is a schematic diagram showing the arrangement of the two signal terminals in a single differential pair of Embodiment 3 of the backplane connector in this utility model.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Insulator; 11. Base; 12. Side; 13. Insertion space; 2. Signal terminal; 21. Insertion part; 22. Signal fisheye; 3. Semi-enclosed shield; 4. Flat shield; 5. Shielding cavity; 51. Laterally extending axis of symmetry; 52. Longitudinally extending axis of symmetry; 53. Center point; 6. Printed circuit board; 61. Grounding hole; 62. Signal hole; 63. Signal trace; 7. Cylindrical shield. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the embodiments.

[0031] Specific embodiment 1 of the backplane connector provided by this utility model:

[0032] See appendix Figure 1The backplane connector is specifically a plug connector, including an insulator 1, a signal terminal 2, and a grounding shield.

[0033] The insulator 1 includes a base 11 and side portions 12 vertically connected to both sides of the base 11. The area enclosed by the base 11 and the sidewalls forms a mating space 13 for inserting a plug connector. The side of the base 11 facing away from the mating space 13 faces the printed circuit board 6 after being press-fitted onto the printed circuit board 6. The signal terminal 2 and the grounding shield are both fixed to the base by insertion, and their respective mating portions for interlocking with the adapter connector are located in the mating space 13. Both the signal terminal 2 and the grounding shield have fisheyes located on the side of the base facing away from the mating space 13.

[0034] Specifically, see Appendix Figure 2 and attached Figure 3 The signal terminal 2 includes a plug portion 21 and a signal fisheye 22 located at one end of the plug portion 21. The end of the plug portion 21 connected to the signal fisheye 22 is inserted into the base 11 of the insulator 1. The end of the plug portion 21 away from the signal fisheye 22 is located in the plugging space 13. The signal fisheye 22 is located on the side of the base away from the plugging space 13. The signal fisheye 22 is used to plug into and communicate with the signal hole 62 on the printed circuit board 6. In this embodiment, the signal fisheye 22 is centrally located at the corresponding end of the plug portion 21, so that the center of the signal fisheye 22 and the center of the plug portion 21 coincide in the insertion and removal direction.

[0035] The signal terminals 2 are arranged in the form of differential pairs, which are arrayed in the longitudinal and transverse directions on the insulator 1. The grounding shield can form a shielding cavity 5, and the plug portion 21 in each differential pair is located in the corresponding shielding cavity 5.

[0036] The grounding shield includes a semi-enclosed shield 3 and a flat shield 4. Each differential pair is equipped with a semi-enclosed shield 3, which has an open side in the longitudinal direction to form a semi-enclosed shielding structure for the corresponding differential pair. The cross-sectional shape of the semi-enclosed shield 3 perpendicular to the insertion and removal direction is C-shaped.

[0037] When there is another adjacent semi-enclosed shield 3 at the opening of the semi-enclosed shield 3, the opening of the semi-enclosed shield 3 is closed by the longitudinal sidewall of the other adjacent semi-enclosed shield 3. The semi-enclosed shield 3 and the adjacent semi-enclosed shield 3 together form a shielding cavity 5 that achieves full-enclosed shielding by corresponding differential pairs. When no differential pairs are set in the opening direction of the semi-enclosed shield 3, a flat shield 4 is set at the opening of the semi-enclosed shield 3, and the flat shield 4 closes the opening of the semi-enclosed shield 3. The semi-enclosed shield 3 and the flat shield 4 together form a shielding cavity 5.

[0038] See appendix Figure 4The shielding cavity 5 has a rectangular structure and has a horizontally extending axis of symmetry 51 and a vertically extending axis of symmetry 52. ​​The intersection of the two axes of symmetry is the center point 53. On each axis of symmetry, the shielding cavity 5 has two walls perpendicular to the corresponding axis of symmetry.

[0039] The centers of the two signal terminals 2 in the same differential pair are located on both sides of the longitudinally extending axis of symmetry 52, and also on both sides of the transversely extending axis of symmetry 51. The two signal terminals 2 are arranged symmetrically with the center point 53 as the center. Compared to the prior art, in this embodiment, the signal terminals 2, which were originally distributed on the transversely extending axis of symmetry 51 of the shielding cavity 5, are now distributed on both sides of the transversely extending axis of symmetry 51 of the shielding cavity 5. This shortens the distance between the signal terminals 2 and one side wall of the shielding cavity 5 in the longitudinal direction, improves the shielding effect, and reduces crosstalk during high-speed signal transmission.

[0040] Placing signal terminal 2 close to one of the longitudinal sidewalls of the shielding cavity 5 fully utilizes the space within the cavity, improving crosstalk while ensuring normal connector operation. Shifting the position of signal terminal 2 laterally to bring it closer to one of the lateral sidewalls of the shielding cavity 5 also improves shielding effectiveness, but this significantly increases the distance between the two signal terminals 2 in the same differential pair, exceeding the pre-defined distance range and hindering differential signal transmission. Conversely, if the distance between signal terminal 2 and the lateral sidewall is too small, there will be insufficient space to accommodate the corresponding terminal in the adapter connector.

[0041] The signal terminal 2 can be directly offset along the longitudinal direction based on the existing technology. This method can achieve the above-mentioned purpose, and the impact on the spacing of the two signal terminals 2 in the same differential pair is smaller than that of moving the signal terminal 2 laterally to bring the signal terminal 2 closer to the side wall of the shielding cavity 5.

[0042] Signal terminal 2 can also be offset along a circle with center point 53 as the center and a radius equal to half the distance between the two signal terminals 2 in the same differential pair, based on existing technology. This method can also achieve the above-mentioned purpose, and the distance between the two signal terminals 2 in the same differential pair can remain unchanged.

[0043] See appendix Figure 4The shielding cavity 5 is divided into four regions by its laterally extending axis of symmetry 51 and its longitudinally extending axis of symmetry 52. ​​Two signal terminals 2 are located in two diagonally opposite regions. Taking one signal terminal 2 as an example, the distance from the signal terminal 2 to the longitudinal adjacent wall of the shielding cavity 5 is A, the distance to the longitudinal wall away from the shielding cavity 5 is B, the distance to the lateral adjacent wall of the shielding cavity 5 is C, and the distance to the longitudinally extending axis of symmetry 52 of the shielding cavity 5 is D. Therefore, B > A, C > D, and A < C. The distance from the insertion part 21 to the laterally extending axis of symmetry 51 is less than the distance from the insertion part 21 to the longitudinally extending axis of symmetry 52. ​​This ensures sufficient space between the insertion part 21 of the signal terminal 2 and the lateral adjacent wall of the shielding cavity 5 to accommodate the corresponding terminal in the socket connector, while also minimizing the distance between the signal terminal 2 and the longitudinal adjacent wall, achieving a better shielding effect.

[0044] In other embodiments of this implementation, the above distance relationships can be adjusted according to actual space requirements.

[0045] In this embodiment, the structure of the printed circuit board 6 for crimp mounting of the backplane connector is as follows: Figure 5 As shown, the printed circuit board 6 is provided with a grounding hole 61 for the fisheye on the grounding shield to be inserted, a signal hole 62 for the signal fisheye 22 to be inserted, and a signal trace 63 connected to the signal hole 62.

[0046] Signal holes 62 are arranged in pairs, corresponding to the arrangement of signal terminals 2. The line connecting the two signal holes 62 in the same pair is inclined at an angle both horizontally and vertically, and the inclination angle and direction of the line connecting the two signal holes 62 in all pairs are the same. This increases the distance between the signal hole 62 and one of the vertically adjacent grounding holes 61, which facilitates the arrangement of signal traces 63 when the signal terminals 2 are arranged more densely.

[0047] The arrangement of the signal traces 63 corresponding to two adjacent pairs of signal holes 62 in the longitudinal direction is shown in the appendix. Figure 5 The signal traces 63 corresponding to the remaining signal holes 62 in the vertical direction are set on the printed circuit boards 6 of different layers.

[0048] Figure 5 In the illustrated embodiment, the two traces extending from the two signal holes 62 in the same pair can have their lengths adjusted by setting curved structures at other locations, so that the total lengths of the two traces are equal. See Appendix Figure 6 In other embodiments, in order to ensure that the two traces corresponding to the two signal holes 62 in the same pair are of equal length and to ensure reliable transmission of differential signals, the two traces led out from the two signal holes 62 can be made to merge first, and then lead out in parallel from the larger gap between the signal hole 62 and the ground hole 61.

[0049] Specific embodiment 2 of the backplane connector provided by this utility model:

[0050] This embodiment is based on embodiment 1. The difference between this embodiment and embodiment 1 is that the signal fisheye is set eccentrically along the longitudinal direction at the corresponding end of the plug-in part in this embodiment.

[0051] In this embodiment, the centers of the plug-in portions of the two signal terminals are located on both sides of the longitudinally extending axis of symmetry and also on both sides of the laterally extending axis of symmetry. However, the centers of the terminal fisheyes on both signal terminals are located on the laterally extending axis of symmetry of the shielding cavity. Therefore, in this embodiment, the plug-in portions of the signal terminals are arranged obliquely in the same way as in Embodiment 1, but the signal fisheyes of the signal terminals are arranged laterally.

[0052] This type of backplane connector is suitable for situations where the density of signal terminals is not high, and no changes to the printed circuit board structure are required.

[0053] Specific embodiment 3 of the backplate connector provided by this utility model:

[0054] This implementation method is based on implementation method 1. The difference between this implementation method and implementation method 1 is that, in this implementation method, see Appendix Figure 7 and in conjunction with the appendix Figure 8 and attached Figure 9 The grounding shield is a cylindrical shield 7 capable of providing full enclosure for the differential pair; a single cylindrical shield 7 can itself form a shielding cavity 5. (See appendix) Figure 10 The arrangement of the two signal terminals 2 in the same differential pair within the shielding cavity 5 is the same as in embodiment 1, and will not be repeated here.

[0055] Specific embodiment 4 of the backplane connector provided by this utility model:

[0056] This embodiment is based on embodiment 1. The difference between this embodiment and embodiment 1 is that in this embodiment, there are two differential pairs in each longitudinally arranged differential pair with the same tilt angle but opposite directions of the signal fisheye connection line. These two differential pairs can be arranged adjacently or not adjacently.

[0057] Correspondingly, on the printed circuit board used to mount the backplane connector, among the longitudinally arranged pairs of signal holes, there are two pairs of signal holes whose connecting lines have the same tilt angle but opposite directions, and the signal traces drawn from these two pairs of signal holes are on the same layer of the printed circuit board.

[0058] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A backplane connector, characterized by, The device includes an insulator (1), signal terminals (2) disposed on the insulator (1), and a grounding shield. The signal terminals (2) are arranged in differential pairs. The differential pairs are arranged in an array along the longitudinal and transverse directions on the insulator (1). The signal terminals (2) include a plug-in portion (21) and a signal fisheye (22) located at one end of the plug-in portion (21). Each differential pair is equipped with a shielding cavity (5) surrounded by the grounding shield. The two plug-in portions (21) in the same differential pair are located in the same shielding cavity (5). The shielding cavity (5) has a longitudinally extending axis of symmetry (52) and a transversely extending axis of symmetry (51). The centers of the two plug-in portions (21) in the same differential pair are located on both sides of the longitudinally extending axis of symmetry (52) and also on both sides of the transversely extending axis of symmetry (51). The two plug-in portions (21) are arranged in a centrally symmetrical manner with the intersection of the two axes of symmetry as the center.

2. The backplane connector of claim 1, wherein, The distance between the plug (21) and the longitudinal adjacent wall of the shielding cavity (5) is less than the distance between the plug (21) and the transverse adjacent wall of the shielding cavity (5).

3. The backplane connector of claim 1, wherein, The distance from the plug (21) to the laterally extending axis of symmetry (51) is less than the distance from the plug (21) to the longitudinally extending axis of symmetry (52).

4. The backplane connector of any of claims 1-3, wherein, The signal fisheye (22) is centered at the corresponding end of the plug (21).

5. The backplane connector of claim 4, wherein, The tilt angles of the lines connecting the two signal fisheyes (22) in each differential pair are equal, and the tilt directions are the same.

6. The backplane connector of claim 4, wherein, Among the longitudinally arranged difference pairs, there are two difference pairs with the same tilt angle but opposite directions of the line connecting the signal fisheyes (22).

7. The backplane connector of any of claims 1-3, wherein, The signal fisheye (22) is longitudinally eccentrically arranged at the corresponding end of the plug (21). The signal fisheye (22) on the two signal terminals (2) in the same differential pair are both located on the symmetrical axis (51) of the transverse extension of the shielding cavity (5).

8. The backplane connector of any of claims 1-3, wherein, One side of the grounding shield is open and forms a semi-enclosed structure for the corresponding differential pair. The opening of the grounding shield is closed by the adjacent grounding shield of the same structure. The grounding shield and the adjacent grounding shield together form a shielding cavity (5).

9. The backplane connector of any of claims 1-3, wherein, The grounding shield includes a semi-enclosed shield (3) with one side open and forming a semi-enclosed structure for the corresponding differential pair. The grounding shield also includes a flat shield (4) for closing the opening of the semi-enclosed shield (3). The semi-enclosed shield (3) and the flat shield (4) together form a shielding cavity (5).

10. The backplane connector of any of claims 1-3, wherein, The grounding shield is a cylindrical shield (7) that can form a fully enclosed structure for the differential pair, and the cylindrical shield (7) itself forms a shielding cavity (5).

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