CN113193441B

CN113193441B - Shielding shell and connector

Info

Publication number: CN113193441B
Application number: CN202110470307.8A
Authority: CN
Inventors: 关中杰; 程喜乐; 许海轲; 孙庆果; 鲁中原
Original assignee: China Aviation Optical Electrical Technology Co Ltd
Current assignee: China Aviation Optical Electrical Technology Co Ltd
Priority date: 2021-04-28
Filing date: 2021-04-28
Publication date: 2022-03-29
Anticipated expiration: 2041-04-28
Also published as: CN113193441A

Abstract

The invention relates to a shielding shell and a connector, wherein the connector comprises a shielding shell and a plurality of terminal modules assembled in the shielding shell, each terminal module comprises terminals, and at least one side of at least one terminal is provided with a small number of signal pairs; the shielding shell comprises an insulating shell and an inner shell shield, wherein an earth-less signal jack matched with an earth-less signal pair is arranged in the insulating shell, and the inner shell shield is positioned in the insulating shell and can at least provide shielding for one side of the contact end of the earth-less signal pair, which lacks a grounding terminal. The connector of the invention enhances the shielding of the earth-less signal to the earth-less side and enhances the anti-crosstalk capability of the connector by injecting the plastic shell inner shielding in the shielding shell.

Description

Shielding shell and connector

Technical Field

The invention belongs to the technical field of connectors, and particularly relates to a shielding shell and a connector.

Background

Fig. 1 and 2 are schematic structural views of a conventional connector, which includes a shield shell, a fixing piece, a clip, and a terminal module, wherein the terminal module is inserted into the shield shell in sequence, and the fixing piece and the clip are finally installed.

The terminal module comprises an A terminal module and a B terminal module, and is composed of terminals, injection molding inserts and shielding sheets, the structure schematic diagrams of the terminal modules are shown in figures 3-5, the A terminal module and the B terminal module appear in pairs and are formed by arranging ABABAB …, and the terminals corresponding to the two terminal modules are different and respectively correspond to the A terminal and the B terminal.

Fig. 6 and 7 are schematic structural diagrams of a conventional terminal, in which contact ends of the terminal include signal pairs and ground terminals, where two sides of a common signal pair have equal-distance ground terminals, and as transmission rate per unit area is higher and higher, node density of the connector is higher and higher, on one hand, to reduce the size of the connector, and on the other hand, to avoid the terminal signal pairs of two terminals from facing each other as much as possible, so as to reduce crosstalk, one side ground terminal of one terminal of the connector is removed, and a signal pair at the outermost side of the a terminal becomes a "less-ground signal pair" because the contact end lacks a ground terminal, and thus, crosstalk of the less-ground signal pair is worse than that of the common signal pair.

Disclosure of Invention

In order to solve the above problems, the present invention provides a shield shell of a novel structure and a connector using the same, the shield shell including an insulating shell, wherein the shield shell is formed by injecting an inner shield into a side wall of the insulating shell, so as to enhance shielding of a side of the earth-poor signal pair, and enhance crosstalk resistance.

The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. According to the connector provided by the invention, the connector comprises a shielding shell and a plurality of terminal modules assembled in the shielding shell, wherein each terminal module comprises terminals, and at least one side of at least one terminal is provided with a small number of signal pairs; the shielding shell comprises an insulating shell and an inner shell shield, wherein an earth-less signal jack matched with an earth-less signal pair is arranged in the insulating shell, and the inner shell shield is positioned in the insulating shell and can at least provide shielding for one side of the contact end of the earth-less signal pair, which lacks a grounding terminal.

The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.

In the aforementioned connector, the terminal module further includes a shielding plate fitted to the terminal, wherein the shielding plate fitted to the terminal having the small number of signal pairs and the shield inside the housing are in contact conduction.

In the connector, the terminal is further provided with a non-mating ground pin with a missing contact end at the outer side of the ground-less signal pair, and the non-mating ground pin is connected and conducted with the shielding plate matched with the terminal.

In the connector, the terminals adjacent to the terminals with few signal pairs are in contact conduction with the shield in the shell through the matched shielding sheets.

In the connector, the shielding plate is in contact conduction with the shield in the housing through at least one convex part on the side surface of the shielding plate.

In the connector, the convex portion is in interference contact with the shield in the housing, and the root portion of the convex portion is provided with the deformation hole, which can satisfy a deformation space when the convex portion is deformed by interference contact.

In the aforementioned connector, a sliding groove for guiding and matching with the convex portion is further provided inside the shielding shell.

In the aforementioned connector, the bottom of the sliding groove is a shield in the housing, which is at least partially exposed and is used for contacting and conducting with the protrusion.

In an embodiment of the connector, the shielding shell is formed by injection molding of an insulating shell and an inner shell shield, and the insulating shell and the inner shell shield are further correspondingly provided with reinforcing holes through which plastic flows when the mold is molded.

The purpose of the invention and the technical problem to be solved are also realized by adopting the following technical scheme. According to the shielding shell provided by the invention, the shielding shell is the shielding shell.

Compared with the prior art, the invention has obvious advantages and beneficial effects. By means of the technical scheme, the invention can achieve considerable technical progress and practicability, has wide industrial utilization value and at least has the following advantages:

the connector is formed by assembling a plurality of terminal modules, a shielding shell, a buckle plate and a fixing piece, wherein each terminal module comprises an A terminal module and a B terminal module, each terminal module comprises a shielding piece, a terminal and an injection molding insert, and the terminal of the A terminal module is provided with a small number of signal pairs; in the side wall of the shielding shell corresponding to the earth-less signal pair, a metal shell inner shield is injected, a protrusion is arranged at the corresponding position of the shielding sheet on the terminal module, and after the terminal module is installed according to the ABABAB sequence, the terminal module can be in contact conduction with the shielding sheet on the wafer module to form a complete backflow path, so that the high-speed performances such as crosstalk, impedance and the like of the earth-less signal pair can be improved.

Drawings

FIG. 1 is a schematic diagram of a conventional connector;

FIG. 2 is an exploded view of a prior art connector;

fig. 3 is a schematic view of a terminal module of a conventional connector a;

fig. 4 is an exploded view of a terminal module of a conventional connector a;

fig. 5 is an exploded view of a B-terminal module of a conventional connector;

FIG. 6 is a schematic view of a conventional A-terminal structure of a connector

FIG. 7 is a schematic view of a conventional terminal B of a connector;

FIG. 8 is a schematic view of the insulating housing of the connector of the present invention;

FIG. 9 is another schematic view of FIG. 8;

FIG. 10 is a partially exploded view of FIG. 8;

fig. 11 is a schematic view of a shield plate of a terminal module a of the connector of the present invention;

FIG. 12 is an enlarged view of a portion of FIG. 11;

fig. 13 is a schematic view of a shield plate of a connector B-terminal module of the present invention;

FIG. 14 is an enlarged view of a portion of FIG. 13;

fig. 15 is a return path for a low ground signal pair of a single terminal module of the connector of the present invention; FIG. 16 is a return path for a low ground signal pair of a pair of terminal modules of the connector of the present invention; FIG. 17 is an enlarged view of a portion of FIG. 16;

fig. 18 is a cross-sectional view of the connector of the present invention.

[ description of main element symbols ]

1: shielding shell

101: insulating shell

102: in-shell shield

2: terminal module

21: a terminal module

22: b terminal module

3: buckle plate

4: fixing sheet

5: terminal with a terminal body

6: injection molding insert

7: shielding sheet

71: convex part

72: deformation hole

8: grounding terminal

9: common signal pair

10: signal pair of less earth

11: signal terminal

12: material clamping hole

13: projection

14: through hole

15: key groove

16: cut of material belt

17: sliding groove

18: less ground signal jack

19: ground needle without matching end

20: reinforcing hole

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the connector according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.

Please refer to fig. 8-18, which are schematic structural diagrams of various parts of the connector of the present invention, the connector includes a shielding shell 1, a terminal module 2 assembled in the shielding shell 1, and a buckle 3 and a fixing piece 4 for fixing the terminal module 2. The terminal module 2 comprises a terminal 5, an injection mold insert 6 and a shielding plate 7, wherein the terminal 5 comprises a signal terminal 11 and a ground terminal 8, the two signal terminals 11 form a signal pair for transmitting signals, and adjacent signal pairs are spaced by the ground terminal 8. In an embodiment of the invention, the signal pair on at least one side of at least one terminal 5 is free of ground terminals 8 outside the contact end, i.e. the terminal contacts at the edge of at least one side of the contact end of at least one terminal 5 are signal pair contacts, such that the signal pair is arranged with ground contacts on only one side and no ground contacts on the other side that achieve its signal shielding. The terminal contact end is positioned at the edge position, the signal pair with the grounding terminal arranged on only one side is a small ground signal pair 10, and the signal pair with the grounding terminal distributed on both sides is a common signal pair 9.

In the present embodiment, the terminal module 2 includes an a terminal module 21 and a B terminal module 22, which are present in pairs and arranged in the form of ABABAB … in the shield case 1. Wherein, one side of the terminal of the A terminal module is provided with a ground-less signal pair 10, and the other positions are respectively provided with a ground terminal and a common signal pair 9. In other embodiments of the present invention, both sides of the terminals in the a terminal module are provided with the ground-less signal pairs, and one side or both sides of the terminals in the B terminal module may also be provided with the ground-less signal pairs 10, that is, at least one side of at least one terminal in the a terminal module and the B terminal module is provided with the ground-less signal pairs 10.

The shield shell 1 comprises an insulating shell 101 and an in-shell shield 102, wherein the insulating shell 101 is provided with an earth-less signal jack 18 matched with the earth-less signal pair 10, and the in-shell shield 102 is positioned at one side of the insulating shell 101 provided with the earth-less signal jack 18, so that the shield protection is provided for one side of the contact end of the earth-less signal pair 10 lacking the grounding contact when the connector is assembled, and the performance of the earth-less signal pair 10 is improved.

In the embodiment of the present invention, the shield 102 in the housing is formed by stamping a metal material strip, and the shield 102 in the housing is formed by combining with the insulating housing 101 through one-step injection molding in an injection molding tool to form the shield housing 1. The shield 102 is in the form of a metal tape. The shield 102 in the metal shell can provide shielding for signals and optimize the signal transmission performance of the connector, especially the low-signal pair 10.

In order to enhance the shielding of the connector signal pair, when the connector is assembled, the shielding plate 7 in the terminal module 2 with the ground signal pair 10 is in contact conduction with the in-shell shielding 102 on the side of the ground signal pair 10, and the shielding plate 7 is in contact conduction with the wiring part of the terminal 5, so that the energy radiation path of the printed board with the ground signal pair > in-shell shielding > shielding plate > terminal wiring fisheye > in the terminal module can be realized, and the crosstalk of the ground signal pair is reduced.

Further, in order to shorten the energy radiation path and enhance the shielding of the ground-less signal pair 10, the terminal of the present invention adds the ground pin 19 without the mating end outside the ground-less signal pair 10, and the ground pin 19 without the mating end only has a fisheye and a routing portion, and does not have a ground contact portion, so that the ground signal pair 10 is provided with ground terminals on both sides of the routing portion and the fisheye portion, and only one side of the contact portion is provided with a ground contact, and the other side of the contact portion is missing. And the tail end of the ground pin 19 without the mating end is conducted with the shielding plate 7 corresponding to the terminal (the shielding plate 7 in the terminal module where the terminal is located), and the shielding plate 7 is conducted with the shield 102 in the housing in a contact manner, so that the energy radiation at the side of the ground signal pair 10 forms a backflow, and in one embodiment, the backflow path is signal pair > shield in housing > shielding plate > ground pin without the mating end > fish eye > printed board, thereby reducing the crosstalk of the ground signal pair.

In order to further increase the return path of the signal radiation and reduce the crosstalk of the low-number signal pair 10, the shield piece 7 of the other terminal module 2(B terminal module 22) adjacent to the terminal module 2(a terminal module 21) provided with the low-number signal pair 10 is also brought into contact conduction with the in-case shield 102. At the same time, the shield 7 is also in contact with the outermost ground terminal of the terminal module (terminal module B) in which it is located, thereby increasing a return path, which in one embodiment is the signal-less-pair > shield-in-housing > B-terminal-module shield > B-terminal-module ground terminal.

The shielding sheet 7 is in contact conduction with the shield in the housing through at least one convex part 71 on the side surface of the shielding sheet. In order to enhance the reliability of the contact, the convex portion 71 is in interference contact with the in-case shield 102. In the embodiment of the present invention, the root of the convex portion 71 on the shield plate 7 is provided with the deformation hole 72, and the deformation hole 72 provides a deformation space for the convex portion 71 to deform when the shield plate 7 is in interference contact with the shield 102 in the housing, so that the insertion force when the terminal module is assembled into the shield housing is reduced. Preferably, the convex portion 71 has a plurality of convex points, but is not limited thereto.

In the embodiment of the present invention, a sliding groove 17 for guiding and matching with the protrusion 71 on the shielding sheet 7 is further provided inside the shielding shell 1, and the bottom of the sliding groove 17 is an in-shell shield 102 which is at least partially exposed and is used for contacting and conducting with the protrusion 71. Namely, the two side walls of the sliding slot 17 are formed by an insulating shell 101, and the bottom is composed of an in-shell shield 102.

At the inner side of the shielding shell 1 at the ground-less signal jack 18, the shield 102 in the shell is at least partially exposed only at the position (such as the sliding groove 17) matched and contacted with the shielding blade 7, the convex part of the shielding blade 7 is contacted and conducted with the shield in the shell at the exposed position, and the other positions are covered with the insulating shell 101 to avoid the contact end of the terminal and the shield 102 in the shell from contacting each other to cause short circuit.

In order to reduce the processing difficulty of the shielding shell 1, corresponding through holes 14 are arranged on the insulating shell 101 and the shield 102 in the shell, and when the insulating shell 101 and the shield 102 in the shell are molded in an injection mold, a mold core can penetrate through the through holes 14 to fix the positions of the insulating shell 101 and the shield 102 in the shell. The shielding shell 1 is further provided with a material clamping hole 12 which penetrates through the insulating shell 101 and the shielding shell 102 simultaneously, and when the shielding shell 1 is subjected to injection molding, parts on a mold can clamp the shielding shell 102 at two sides, so that the position of the shielding shell is further fixed.

In order to enhance the structural strength of the shield 102 on the insulating housing 101 after the part is molded, the shield 102 has a reinforcing hole 20 for allowing plastic to flow through during the molding process.

The shielding shell 1 of the invention is also provided with a bulge 13 and a key slot 15 which are matched with the adapter connector in a guiding way so as to enhance the guiding and limiting when the connector is inserted.

In the embodiment of the present invention, each of the a terminal modules has the small number of ground signal pairs 10, the shield strips 7 on each terminal module 2 have the protrusions 71, and the protrusions 71 contact the shield 102 in the housing in the sliding groove 17 of the shield housing 1, so that the shield 102 in the housing and the shield strips of the a/B terminal module are electrically connected to each other, thereby providing a return path similar to the ground pin for the small number of ground signal pairs 10, and greatly improving high-speed performance such as crosstalk of the small number of ground signal pairs. The inner side walls of the signal pairs 10 in the shield case 1 are covered with plastic to prevent short circuit between the signal pairs and the shield.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A connector comprising a shield shell and a plurality of terminal modules fitted in the shield shell, the terminal modules including terminals, characterized in that: at least one side of at least one terminal is provided with a ground-less signal pair; the shielding shell comprises an insulating shell and an inner shell shield, wherein an earth-less signal jack matched with an earth-less signal pair is arranged in the insulating shell, and the inner shell shield is positioned in the insulating shell and can at least provide shielding for one side of the contact end of the earth-less signal pair, which lacks a grounding terminal.

2. The connector of claim 1, wherein: wherein the terminal module further comprises a shield plate fitted to the terminal, wherein the shield plate fitted to the terminal having fewer signal pairs and the shield inside the housing are in contact conduction.

3. The connector of claim 2, wherein: the terminal is also provided with a non-matching end ground pin with a missing contact end at the outer side of the less-ground signal pair, and the non-matching end ground pin is connected and conducted with a shielding sheet matched with the terminal.

4. The connector of claim 2, wherein: the terminals adjacent to the terminals with few signal pairs are in contact conduction with the shield inside the housing through the adaptive shield sheets thereof.

5. The connector according to any one of claims 2 to 4, wherein: the shielding sheet realizes contact conduction with the shielding in the shell through at least one convex part on the side surface of the shielding sheet.

6. The connector of claim 5, wherein: the convex part is in interference contact with the inner shield of the shell, the root of the convex part is provided with a deformation hole, and the deformation hole can meet the deformation space of the convex part during interference contact deformation.

7. The connector of claim 5, wherein the shield shell is further provided with a sliding groove inside for guiding engagement with the protrusion.

8. The connector of claim 7 wherein said slot floor is an in-housing shield at least partially exposed for contact with said projection.

9. The connector of claim 5, wherein the shield housing is injection molded from the dielectric housing and the shield-in-housing, and the dielectric housing and the shield-in-housing are correspondingly provided with reinforcement holes for plastic to flow through during molding.

10. A shielding shell, characterized in that: the shielding shell comprises an insulating shell and an in-shell shield, and the shielding shell is internally provided with a ground-less signal jack matched with the ground-less signal pair; the in-housing shield is positioned within the insulative housing for providing shielding to the terminal ground-less signal pair contact end on the side thereof lacking the ground terminal.