CN215870059U

CN215870059U - Shielding sheet, terminal module and connector

Info

Publication number: CN215870059U
Application number: CN202120979823.9U
Authority: CN
Inventors: 徐振峰; 李国辉; 张维良; 郭策; 吴张朋; 侯代友; 范帅; 韩博文
Original assignee: China Aviation Optical Electrical Technology Co Ltd
Current assignee: China Aviation Optical Electrical Technology Co Ltd
Priority date: 2021-05-06
Filing date: 2021-05-06
Publication date: 2022-02-18
Anticipated expiration: 2031-05-06

Abstract

The utility model relates to a shielding sheet, wherein the front end of the shielding sheet is provided with a shielding sheet extension area, the front end of the shielding sheet extension area is provided with a notch and contact bulges, and the notch is positioned between the two contact bulges; after the shielding piece is assembled, the notch is positioned below the signal terminal elastic piece, and the contact bulge is positioned below the grounding terminal elastic piece; the rear end of the extension area of the shielding plate is provided with a non-contact bulge, the non-contact bulge is positioned below the signal terminal, and a gap is formed between the non-contact bulge and the signal terminal under the insertion state of the connector, so that a local capacitor is formed; the utility model adopts the full shielding mode of M-shaped gaps and bulges, thereby effectively reducing the problem of low impedance of a mating area caused by the full-wrapped terminal of the shielding plate, increasing the grounding backflow path and forming local capacitance filtering, reducing the crosstalk between differential pairs and improving the SI performance of the connector.

Description

Shielding sheet, terminal module and connector

Technical Field

The utility model belongs to the technical field of connectors, and particularly relates to a shielding sheet, a terminal module and a connector.

Background

In a modern data communication transmission system, the transmission rate is higher and higher, a high-speed interconnection system is widely applied to a communication network and a data exchange system, a high-speed backplane connector is used as a core bridge for data communication, the performance requirement is higher and higher, crosstalk is greatly reduced by applying shielding sheets in various forms, the SI performance of the high-speed backplane connector is improved, and the transmission requirement of higher rate can be met.

As shown in fig. 1 to 3, the conventional shielding scheme of the high-speed backplane connector mainly uses a shielding plate or conductive plastic for shielding, the signal terminal and the ground terminal are formed by stamping, and after molding, injection molding is performed once to arrange the signal terminal and the ground terminal in an insulator, the front end of the signal terminal is a signal terminal spring 100, the front end of the ground terminal is a ground terminal spring 200, the shielding plate 300 is combined with the insulator 400 after injection molding once, and the shielding plate and the insulator are combined into a terminal module (i.e., wafer) by injection molding twice. The front end of the shielding sheet is provided with a shielding sheet spring sheet 301 which is positioned below the grounding terminal spring sheet 200, and the shielding grounding function is realized after the male end/female end connectors are mutually inserted and combined, so that the signal terminal crosstalk is reduced. The prior art has the following disadvantages: in the prior art, the shielding sheet is pressed on the primary injection molding insulator in a secondary injection molding mode and is contacted with the wiring part of the grounding terminal to form a signal shielding backflow path, so that the assembly efficiency is low. Due to the improvement of the transmission rate and the deviation of the manufacturing process, the actual product performance is often inferior to the theoretical simulation value, especially, a mating area (a male-female end combination area) is easy to generate resonance points due to actual processing deviation, poor contact and other factors, so that the performance of the connector SI is deteriorated, even the transmission quality of high-frequency signals is affected, and the window 302 positioned right below the signal terminal elastic sheet 100 is arranged on the existing shielding sheet, so that the magnetic field leakage can be caused, the shielding effect is affected, and even the SI is deteriorated.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art, the utility model provides a shielding sheet structure with notches and bulges, wherein the shielding sheet is combined with a terminal by adopting a buckle structure, secondary injection molding is avoided, and a full shielding mode with M-shaped notches and bulges is adopted, so that the problem of low impedance of a mating area caused by the fact that the terminal is fully covered by the shielding sheet is effectively solved, a grounding backflow path is increased, local capacitance filtering is formed, the crosstalk between differential pairs of the mating area is reduced, and the SI performance of a connector is improved.

The purpose of the utility model and the technical problem to be solved are realized by adopting the following technical scheme. According to the shielding sheet provided by the utility model, the front end of the shielding sheet is provided with a shielding sheet extension area, the front end of the shielding sheet extension area is provided with a notch and contact bulges, and the notch is positioned between the two contact bulges; after the shielding piece is assembled, the opening is located below the signal terminal elastic piece, and the contact bulge is located below the grounding terminal elastic piece.

Preferably, the rear end of the notch extends to the contact below of the signal terminal elastic sheet, namely the rear end of the notch is terminated under the contact of the signal terminal elastic sheet, so that the defects of magnetic field leakage and poor shielding effect caused by opening the original window below the signal terminal elastic sheet can be effectively avoided.

Preferably, the gap is an M-shaped gap.

Preferably, the M-shaped gap includes a first gap portion, a second gap portion, and a protrusion disposed between the first gap portion and the second gap portion.

Preferably, the rear end of the extension area of the shielding plate is provided with a non-contact bulge, the non-contact bulge is arranged in a protruding mode towards the signal terminal elastic sheet along the thickness direction of the shielding plate, and the non-contact bulge and the male end signal pin are arranged at intervals when the non-contact bulge is used, so that a filter capacitor is formed.

Preferably, the shielding plate is connected with the ground terminal through a snap structure. The clamping structure comprises a clamping jaw and a fixing hole which are matched with each other, the clamping jaw is arranged on one of the shielding sheet and the grounding terminal, and the fixing hole is arranged on the other one of the shielding sheet and the grounding terminal.

In an aspect of the terminal module of the present invention, the terminal module includes:

the one-time injection molding body comprises a signal terminal elastic sheet and a grounding terminal elastic sheet;

the shielding sheet is assembled on one side of the one-time injection molded body; the shielding sheet is the shielding sheet.

In an aspect of the connector of the present invention, the connector includes an insulating housing and at least one terminal module, the terminal module is mounted on the insulating housing, and the terminal module is the above terminal module.

Preferably, the connector is a high-speed backplane connector.

By means of the technical scheme, the utility model has the beneficial effects that:

1. the shielding piece is installed through the buckle structure, and the mode of moulding plastics with the secondary is not needed to realize the location of shielding piece and combine with ground terminal, has improved production efficiency, has reduced manufacturing cost.

2. The M-shaped opening and the contact bulges matched with the arrangement mode of the signal terminals and the grounding terminals are arranged in the extension area of the shielding sheet, the M-shaped opening is positioned right below the elastic sheet of the signal terminal, and the two contact bulges are arranged between the two contact bulges, so that the problem of low impedance of the mating area caused by the fact that the shielding sheet fully covers the terminals can be effectively solved, and the high-speed performance of the connector is met; the contact bulge is located under the ground terminal shrapnel, and when public/female end connector was not inserted, the contact bulge had certain clearance with the ground terminal shrapnel, and after the interpolation closed, ground connection bulge and public end earth pin one side contact, ground terminal shrapnel and the contact of public end earth pin another side to form two-sided ground return circuit, promote shielding ground effect.

3. The M-shaped opening is terminated at the contact of the signal terminal elastic sheet, so that the defects of magnetic field leakage and poor shielding effect caused by opening the original window below the signal terminal elastic sheet can be effectively avoided.

4. The rear end of the male-female combination area is provided with a plurality of non-contact bulges which are arranged at intervals, the non-contact bulges are positioned below the signal terminal elastic sheets and keep a certain distance with the signal terminals, after the two ends of the male and female combination area are inserted, the non-contact bulges are not contacted with the male-end signal pins, a certain gap is formed between the non-contact bulges and the male-end signal pins, a local capacitor is formed between the non-contact bulges and the male-end signal pins, a filtering effect is achieved, and crosstalk can be improved. And the non-contact bulge can be combined with the contact bulge for use, and can also be used independently, so that the crosstalk is improved.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1 to 3 are schematic diagrams of a shielding scheme in a conventional terminal module.

Fig. 4 is a perspective view of the shield plate of the present invention.

Fig. 5 is a front view of the shield sheet of the present invention.

Figure 6 is a drawing of the mating of a female end connector to a male end connector in an embodiment of the utility model.

FIG. 7 is a block diagram of a female end connector in an embodiment of the utility model.

Fig. 8 is a rear view of the terminal module of the present invention.

Fig. 9 is a schematic front view of a terminal module of the present invention.

Fig. 10 is a side view of the terminal module of the present invention.

Fig. 11 is a side assembly view of the terminal module of the present invention.

Fig. 12 is a schematic diagram of the positions of the non-contact bump and the male signal pin after the female connector and the male connector are plugged.

Fig. 13 is a view showing the engagement of the claws with the fixing holes in the utility model.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the intended purpose of the utility model, the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments.

Fig. 4 to 13 show an embodiment of the connector, in which the connector is a female connector 1000, and the male connector 2000 is adapted to be inserted into the female connector, and the female connector is a high-speed backplane connector. The connector comprises an insulating shell 1 and a plurality of terminal modules 2 which are arranged on the insulating shell side by side, wires in adjacent terminal modules are staggered, high-frequency signal transmission is facilitated, a plastic buckle 21 is arranged on each terminal module 2, and the quick insertion and fixation of the terminal modules can be realized through the cooperation of the plastic buckle 21 and a positioning groove 11 in the insulating shell 1.

Referring to fig. 8 and 9, the terminal module 2 includes an injection molded body 20 and a shielding plate 4, the injection molded body 20 includes an insulator 3, a plurality of ground terminals 5 and signal terminals 6, and when the terminal module 2 is manufactured, the ground terminals and the signal terminals are cast together by integral casting, so as to form the injection molded body 20, and the ground terminals and the signal terminals are distributed in the insulator 3. In the terminal module 2, two adjacent signal terminals form a differential pair, and the differential pair is arranged between two ground terminals, so that crosstalk between adjacent differential pairs in the same terminal module can be reduced. The front end of the signal terminal is provided with a signal terminal elastic sheet 61, and after the male and female connectors are plugged, the signal terminal elastic sheet 61 is in contact conduction with the male end signal pin 7; the other end of the signal terminal is a signal terminal crimping end, and the crimping end is preferably of a fish eye structure and is used for welding-free crimping with a printed board and other devices. The front end of the grounding terminal is provided with a grounding terminal spring piece 52 which is elastically attached to a male end grounding pin in the male end connector to realize contact conduction.

As shown in fig. 8, the ground terminal dome and the signal terminal dome are arranged in a straight direction, and for convenience of description, the straight direction is defined as a left-right direction, and the thickness direction of the shield plate is an up-down direction.

In this embodiment, the shielding plate 4 has a shielding plate body 40 and a shielding plate extension area 41 extending forward along the shielding plate body, and the shielding plate extension area is a matting area. In order to improve the assembly efficiency of the shielding sheet 4 and avoid positioning the shielding sheet in a secondary injection molding manner, a plurality of clamping jaws 42 are arranged on the shielding sheet 4, the clamping jaws are specifically arranged on the shielding sheet body 40, fixing holes 51 with corresponding quantity and positions are arranged on a routing part of the grounding terminal, the routing part is embedded in the insulator 3, the clamping jaws 42 are in interference fit with the fixing holes 51, so that buckling and contact conduction of the shielding sheet 4 and the grounding terminal are realized, and at the moment, the shielding sheet is arranged on one side of a primary injection molded body; as shown in fig. 13, the fixation holes are preferably peanut holes.

The front end of the shield extension area 41 is provided with a plurality of gaps 43 and a plurality of contact bulges 44, the rear end of the shield extension area 41 is provided with a plurality of non-contact bulges 45, the gaps and the contact bulges are arranged along the arrangement direction of the grounding terminal elastic sheet and the signal terminal elastic sheet, namely, the gaps are arranged along the left-right direction, and the gaps are arranged between the two contact bulges. After the shielding piece is buckled on the terminal module, the notch 43 is located below the signal terminal elastic piece 61, namely under the signal terminal elastic piece stub 611, so that the problem that the impedance of a mating area is low due to the fact that the shielding piece completely covers the terminal can be effectively reduced, and the notch is used for improving the impedance of the mating area. The rear end of opening ends under the contact of signal terminal shell fragment, and the contact is the mating point promptly, and it is the contact point of signal terminal shell fragment and public end signal needle, and this can effectively avoid among the prior art window to open below the signal terminal shell fragment and the magnetic field that leads to reveals, the drawback of shielding effect variation.

The contact bump 44 is positioned below the ground terminal spring 52, and the contact bump is opposite to the ground terminal spring; as shown in fig. 9 or fig. 11, if the front end of the ground terminal spring piece is a bifurcated structure, there are two corresponding contact bulges corresponding to each ground terminal spring piece 52. When the female connector is not inserted into the male connector, the contact bump 44 is spaced apart from the ground terminal spring 52. After the female end connector and the male end connector are plugged, the contact bulge 44 contacts with one surface of the male end grounding pin in the male end connector, and the grounding terminal elastic sheet 52 contacts with the other surface of the male end grounding pin to form a double-surface grounding loop, so that the shielding grounding effect is improved.

The non-contact bulge and the contact bulge are arranged towards the corresponding one-time injection molded body in a protruding mode, the non-contact bulge 45 is located under the signal terminal elastic piece 61 and keeps a certain distance from the signal terminal elastic piece, after the female terminal connector and the male terminal connector are inserted and combined, the non-contact bulge is not in contact with the male terminal signal pin 7, and a gap 8 still exists between the non-contact bulge and the male terminal signal pin, as shown in fig. 12, a local filter capacitor is formed between the non-contact bulge and the male terminal signal pin at the moment, a filtering effect is achieved, resonance is avoided, and the crosstalk condition is improved.

In this embodiment, the notch is preferably an M-shaped notch, the M-shaped notch has a first notch 431, a second notch 432, and a protrusion 433 in its structure, the protrusion is located between the first and second notches, each notch is located below one of the signal terminal spring pieces of the differential pair, and the protrusion is located between two signal terminal spring pieces of the differential pair in the left-right direction. The protrusions can improve crosstalk between the differential pairs, and particularly, in the adjacent terminal modules, electromagnetic radiation will occur to the differential pairs due to transmission of high-speed signals, and the protrusions can block the intensity of radiation outside the differential pairs, so that crosstalk between the adjacent differential pairs is avoided. In other embodiments, the gap is not limited to an M-shaped gap, but may be a circular gap or a rectangular gap.

Further, the high-speed backplane connector further comprises a fixing sheet 9, the fixing sheet 9 is used for connecting two or more terminal modules 2, the rear ends of all the terminal modules can be uniformly limited relatively through the fixing sheet, relative movement between the terminal modules is avoided, and the terminal modules are stably arranged inside the insulating shell. The connection mode of the fixing sheet 9 and the terminal module 2 can be that a clamping groove is arranged on the fixing sheet, a clamping bulge is arranged on the terminal module, the clamping and the matching are relatively limited, and the fixing sheet and the terminal module can be fixedly connected by adopting conventional fasteners such as screws, clamping structures and the like.

Preferably, the connector further includes a positioning plate 11, the positioning plate 11 has a hole for receiving the fisheye crimping end of the tail portion of the ground terminal/signal terminal, and the positioning plate is mounted on the terminal module 2, and can be fixedly assembled with the insulator, for example, the positioning plate can be fastened to the mounting end of the terminal module in an interference manner or by a fastening structure, a screw structure, or the like, so as to protect the fisheye crimping end.

The specific embodiment of the terminal module in the utility model is the same as the terminal module in the connector embodiment, and is not described herein again.

The specific embodiment of the shielding plate in the utility model is the same as the structure of the shielding plate in the connector embodiment, and is not described again here.

The above description is only a preferred embodiment of the present invention, and any person skilled in the art can make any simple modification, equivalent change and modification to the above embodiments according to the technical essence of the present invention without departing from the scope of the present invention, and still fall within the scope of the present invention.

Claims

1. The shielding piece, the front end of shielding piece (4) is equipped with shielding piece extension area (41), its characterized in that:

the front end of the shielding sheet extension area (41) is provided with a notch (43) and contact bulges (44), and the notch (43) is positioned between the two contact bulges (44); after the shielding piece is assembled, the gap (43) is positioned below the signal terminal elastic sheet (61), and the contact bulge (44) is positioned below the grounding terminal elastic sheet (52).

2. The shield sheet according to claim 1, characterized in that: the rear end of the gap (43) extends to the lower part of the contact of the signal terminal elastic sheet (61).

3. The shield sheet according to claim 2, characterized in that: the opening (43) is an M-shaped opening.

4. The shield sheet according to claim 3, characterized in that: the M-shaped notch comprises a first notch part (431), a second notch part (432) and a bulge (433) arranged between the first notch part and the second notch part.

5. The shield sheet according to claim 1, characterized in that: the rear end of the shielding plate extension area (41) is provided with a non-contact bulge (45), the non-contact bulge (45) protrudes towards the signal terminal elastic sheet (61) along the thickness direction of the shielding plate, and the non-contact bulge (45) and the male end signal pin (7) are arranged at intervals when the non-contact bulge is used, so that a filter capacitor is formed.

6. The shield sheet according to claim 1, characterized in that: the shielding sheet (4) is connected with the grounding terminal (5) through a buckling structure.

7. The shield sheet according to claim 6, characterized in that: the buckling structure comprises a clamping jaw (42) and a fixing hole (51) which are matched with each other, the clamping jaw is arranged on one of the shielding sheet (4) and the grounding terminal (5), and the fixing hole is arranged on the other one of the shielding sheet (4) and the grounding terminal (5).

8. A terminal module, comprising:

the injection molding body (20) comprises a signal terminal elastic sheet (61) and a grounding terminal elastic sheet (52);

a shielding sheet (4) assembled on one side of the one-time injection molding body;

the method is characterized in that: the shielding sheet (4) is the shielding sheet according to any one of claims 1 to 7.

9. Connector, including insulating housing (1) and at least one terminal module (2), terminal module (2) are installed on insulating housing (1), its characterized in that: the terminal module (2) is the terminal module as claimed in claim 8.

10. The connector of claim 9, wherein: the connector is a high speed backplane connector.