CN113131236A

CN113131236A - Electrical connector

Info

Publication number: CN113131236A
Application number: CN201911407348.1A
Authority: CN
Inventors: 刘朦; 萧世伟; 萧裕三; 张衍智; 江志耀; 陈玉科
Original assignee: Fu Ding Precision Industry Zhengzhou Co Ltd; Hongteng Precision Technology Co Ltd
Current assignee: Fu Ding Precision Industry Zhengzhou Co Ltd; Hongteng Precision Technology Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2021-07-16
Anticipated expiration: 2039-12-31
Also published as: CN113131236B; TW202131564A

Abstract

The invention discloses an electric connector which is used for being installed on a circuit board and matched with a butting connector, and comprises a plurality of module pieces which are transversely stacked, wherein each module piece comprises a conductive shell, a plurality of signal terminals contained in the conductive shell and an insulating piece which is coated outside each signal terminal and installed on the conductive shell, a plurality of grooves are formed in one side of the conductive shell, the signal terminals are contained in the corresponding grooves, the insulating piece electrically isolates the signal terminals from the conductive shell, and the insulating piece outside at least one signal terminal is discretely arranged on a signal transmission path.

Description

Electrical connector

[ technical field ] A method for producing a semiconductor device

The present invention relates to an electrical connector, and more particularly, to a high-speed backplane connector used in the field of communications.

[ background of the invention ]

U.S. patent No. 6,988,902, issued on 24.1.2006, discloses a combination of a plug electrical connector and a receptacle electrical connector, wherein the plug electrical connector and the socket electrical connector both comprise a plurality of rows of terminals, the terminals of each row comprise differential signal pairs and grounding terminals arranged between adjacent differential signal pairs, each differential signal pair of each row is staggered with the corresponding differential signal pair of the adjacent row, no metal shielding piece is arranged between the adjacent rows, although crosstalk can be reduced to some extent by the staggered arrangement of the differential pairs, transmission of lower differential signals of 6Gbps and below can be achieved, however, with the increase of the transmission speed of differential signals, the transmission speed of many pairs of differential signals has reached 25Gbps, and even higher, it has reached 56Gbps, so that it is difficult to satisfy the transmission of high-speed signals with such a simple misalignment arrangement.

Accordingly, there is a need for an improved electrical connector that can transmit differential signaling at 56Gbps or higher.

[ summary of the invention ]

The technical problem to be solved by the invention is as follows: an electrical connector having a high transmission speed and a simple and reliable structure is provided.

In order to solve the above problems, the present invention provides an electrical connector, configured to be mounted on a circuit board and to be matched with a mating connector, where the electrical connector includes a plurality of module pieces stacked horizontally, each of the module pieces includes a conductive housing, a plurality of signal terminals accommodated in the conductive housing, and an insulating member covering the signal terminals and mounted on the conductive housing, one side of the conductive housing is provided with a plurality of grooves, the signal terminals are accommodated in the corresponding grooves, the insulating member electrically isolates the signal terminals from the conductive housing, and the insulating member outside at least one of the signal terminals is discretely disposed on a signal transmission path.

Compared with the prior art, the electric connector provided by the invention has the advantages that the insulating pieces are discretely arranged on the signal transmission path to adjust the impedance matching between the signal terminals, so that better conditions are provided for stable transmission of high-frequency signals.

[ description of the drawings ]

Fig. 1 is a perspective view of a first electrical connector and a second electrical connector mated therewith of a connector assembly consistent with the present invention.

Fig. 2 is a perspective view of the first electrical connector and the second electrical connector shown in fig. 1 before mating.

Fig. 3 is a perspective view of the first electrical connector and the second electrical connector of fig. 2 from another perspective prior to mating.

Fig. 4 is a perspective view of the first electrical connector shown in fig. 1.

Fig. 5 is a perspective view of the first electrical connector of fig. 4 in another orientation.

Fig. 6 is a partially exploded view of the first electrical connector shown in fig. 4.

Fig. 7 is a partially exploded view in another orientation of the first electrical connector of fig. 6.

Fig. 8 is a view of the terminals and the fixing block of the first electrical connector shown in fig. 6.

Fig. 9 is a perspective view of the first and second shield blades of the first electrical connector shown in fig. 1.

Fig. 10 is a partially exploded view of the second electrical connector shown in fig. 1.

Fig. 11 is a partially exploded view in another orientation of the second electrical connector of fig. 10.

Fig. 12 is a perspective view of the modular segments of the second electrical connector shown in fig. 10.

Fig. 13 is a partially exploded view of one of the modular sheets of fig. 12.

Fig. 14 is a further exploded view of one of the modular sheets of fig. 13.

Fig. 15 is a further exploded view in another orientation of one of the modular pieces of fig. 14.

Fig. 16 is a perspective view of all of the signal terminals of one of the module pieces shown in fig. 15.

Figure 17 is a perspective view of the mating of the ground plane of one of the dies shown in figure 15 with a conductive housing.

Figure 18 is a flow chart of an assembly of one of the dies shown in figure 12.

Fig. 19 is a cross-sectional view taken along a-a of the connector assembly shown in fig. 1 in a mated state.

Fig. 20 is a cross-sectional view taken along the direction B-B of the connector assembly shown in fig. 1 in a mated state.

[ description of main reference symbols ]

First electrical connector 1 second electrical connector 2

First circuit board 3 second circuit board 4

Terminal 20 of housing 10

First shield plate 31 and second shield plate 32

Bottom wall 11 side wall 12

Mounting hole 111 of accommodating space 13

Guide projection 121, guide groove 123

Terminal pair 22 mounting portion 211

Body portion 215 of docking portion 213

Fixed block 23 shielding cavity 33

First engaging portion 313 flat plate portion 315

Second matching part 323 of contact spring 319

Module piece 40 securing member 50

Conductive housing 60 signal terminal 71

Ground plate 90 of insulator 80

Upper edge 62 of lower edge 61

Leading edge 63 and trailing edge 64

First side 66 and second side 67

Groove 662 rib 663

Convex hull 664 first hole 68

Second hole 69 first pin 51

Second pin 52 signal terminal pair 710

Butt end 73 mounting feet 74

Middle 75 first portion 753

Front contact point 731 of second portion 755

Rear contact 733 first side 91

Second side 92 hole 95

Slotted 953 flat panel portion 910

Contact portion 911 pin 913

First module 41 and second module 42

Recess 45 mounting groove 451

Projection 453 first signal terminal 711

Second signal terminal 712 ground pin 327

Side wall 632 face 660

Tear face 951

[ detailed description ] embodiments

As shown in fig. 1 to 20, the connector assembly 100 of the present invention includes a first electrical connector 1 and a second electrical connector 2 mated with the first electrical connector 1, wherein the first electrical connector 1 is mounted on a first circuit board 3, the second electrical connector 2 is mounted on a second circuit board 4, and the transmission speed per channel of the first electrical connector 1 and the second electrical connector 2 can reach 112Gbps or higher.

The first electrical connector 1 includes a housing 10, a plurality of terminals 20 held on the housing 10, a plurality of first shielding plates 31 arranged in a transverse direction for shielding the terminals 20, and a plurality of second shielding plates 32 arranged in a longitudinal direction for shielding the terminals 20.

The housing 10 includes a bottom wall 11 and a pair of side walls 12 extending from the same side of two ends of the bottom wall 11, the side walls 12 being spaced from each other, and the bottom wall 11 and the two side walls 12 together enclose a receiving space 13. The bottom wall 11 includes a plurality of mounting holes 111 arranged in rows and columns and penetrating through the bottom wall 11. The side wall 12 is provided with a guide protrusion 121 and a guide groove 123 for guiding the second electrical connector 2 to be accurately inserted into the receiving space 13. The housing 10 may be made of pure metal, or may be made of plastic material, and then plated to form a conductive surface, or may be made of pure plastic material.

Two adjacent terminals 20 are provided in the form of terminal pairs 22, each terminal pair 22 being configured to transmit a pair of differential signals. The terminals 20 are mounted on the bottom wall 11 of the housing 10 in an array of rows and columns, and each pair of the terminals 20 includes a mounting portion 211 extending downward from the bottom wall 11 for mounting on the first circuit board 3, a mating portion 213 extending upward into the receiving space 13, and a main body portion 215 between the mounting portion 211 and the mating portion 213. The fixing block 23 is further included, the main body portions 215 of the pair of terminals 20 are integrally formed on the fixing block 23, and the fixing block 23 and the mounting holes 111 on the bottom wall 11 are matched with each other to fix the pair of terminals 20 on the bottom wall 11. Of course, if the housing is made of pure plastic material, the fixing block 23 is not needed to mount the terminal 20 directly on the bottom wall 11.

The first shielding plates 31 are parallel to each other, and the second shielding plates 32 are parallel to each other. The plurality of first shield plates 31 and the plurality of second shield plates 32 are arranged to cross each other. Preferably, in this embodiment, the plurality of first shielding sheets 31 and the plurality of second shielding sheets 32 are perpendicular to each other, so as to form a plurality of shielding cavities 33 separated from each other. Each of the terminal pairs 22 is disposed in the corresponding shielding cavity 33, such that a first shielding plate 31 is disposed between each of the terminal pairs 22 and its laterally adjacent terminal pair 22, and two second shielding plates 32 are disposed between each of the terminal pairs 22 and its longitudinally adjacent terminal pair 22. The plurality of first shielding plates 31, the plurality of second shielding plates 32, and the housing 10 are integrally cast or formed by powder metallurgy. The first shielding plates 31 and the second shielding plates 32 may be integrally cast or formed by powder metallurgy, and then assembled on the housing 10, or the first shielding plates 31 and the second shielding plates 32 are respectively formed by stamping sheet metal and then assembled on the housing 10, where the housing 10 may be formed by casting or powder metallurgy, or formed by injection molding of a plastic material and then electroplated to form a conductive surface, or formed by injection molding of a plastic material. Each of the first shield plates 31 includes a first fitting portion 313 extending upward into the receiving space 13. The first engaging portion 313 includes a flat plate portion 315 and a plurality of contact springs 319 extending from the flat plate portion 315. The second shield plate 32 includes a second fitting portion 323 extending into the receiving space 13, the first fitting portion 313 extends into the receiving space 13 by a dimension larger than that of the mating portion 213 of the terminal 20, and the second fitting portion 323 extends into the receiving space 13 by a dimension smaller than that of the terminal 20. The second shield plate 32 further includes a plurality of grounding pins 327 extending downward for being mountable on the first circuit board 3, and the first shield plate 31 is not provided with the grounding pins.

The terminal pairs 22 of the first electrical connector 1 of the present invention are completely shielded by the first and

second shielding pieces

31 and 32 in the circumferential direction, which improves the shielding effect of the first electrical connector 1, and each terminal pair 22 is provided with two spaced apart second shielding pieces 32 between the adjacent terminal pair 22 in the longitudinal direction, which provides better shielding effect and better conditions for stable transmission of high frequency signals.

The second electrical connector 2 includes a plurality of module pieces 40 arranged in a lateral stack and a fixing member 50 for fixing the plurality of module pieces 40 as a single body, each of the module pieces 40 includes a conductive housing 60, a plurality of signal terminals 71 received in the conductive housing 60 from a side of the conductive housing 60, an insulating member 80 for electrically isolating the signal terminals 71 from the conductive housing 60, and a sheet-like ground plate 90 mounted on a side of the conductive housing 60.

The conductive housing 60 has electrical conductivity and good heat dissipation, and the conductive housing 60 can be formed by casting, powder metallurgy, injection molding, electroplating a conductive surface, or other processes. The conductive housing 60 includes a lower edge 61 disposed toward the second circuit board 4, an upper edge 62 opposite the lower edge 61, a front edge 63 opposite the mating first electrical connector 1, and a rear edge 64 opposite the front edge 63.

The conductive housing 60 is a sheet, has a thickness direction in a transverse direction, and has a first side surface 66 and a second side surface 67 which are arranged opposite to each other in the thickness direction, wherein a plurality of grooves 662 are formed in the first side surface 66, and each groove 662 is recessed from the first side surface 66 to the conductive housing 60 and extends from the front edge 63 to the lower edge 61. The grooves 662 run in the same direction as the signal terminals 71 for receiving the signal terminals 71. The insulator 80 has the same contour as the groove 662 for being received in the conductive housing 60. Opposing ribs 663 are formed on both sides of each groove 662 of the conductive housing 60. The rib 663 includes a surface 660 at the first side surface 66 and a side wall 632 connected to the groove 662, and the side wall 632 is mechanically and electrically connected to the second mating portion 323 of the second shielding plate 32 of the first electrical connector 1 near the front edge. The surface 660 of the rib 663 is provided with a plurality of convex hulls 664. The convex hull 664 and the conductive shell 60 are integrally cast, or formed by coating a layer of conductive material after injection molding. The convex hull 664 is cylindrical or square or other shapes, and in a preferred embodiment, the convex hull 664 is cylindrical. The region between the outermost rib 663 and the upper edge 62 and the rear edge 64 of the conductive shell 60 is provided with a plurality of first holes 68 transversely penetrating the conductive shell 60 and a second hole 69 having a shape different from that of the first holes 68, the plurality of first holes 68 being provided near the upper edge 62 and the rear edge 64 and being arranged in the first direction and the second direction perpendicular to each other. The second holes 69 are disposed near the intersection of the upper edge 62 and the rear edge 64 and are disposed inboard of a plurality of the first holes 68 which are elongated and have a first direction along which the length of the first holes 68 is oriented, and a second direction along which the length of the first holes 68 is oriented. The second holes 69 are triangular and have rounded corners at three corners, and the size of the second holes 69 is larger than the sum of the sizes of all the first holes 68. The first apertures 68 of the module pieces 40 are aligned with each other and the second apertures of the module pieces 40 are aligned with each other. The fixing member 50 includes first pins 51 passing through the first holes 68 and a second pin 52 passing through the second hole 69. The first hole 68 has the same shape as the first pin 51, and the second hole 69 has the same shape as the second pin 52. The first pin 51 and the second pin 52 may be made of any one of a metal material and a plastic material. The combination of the first pin 51 and the second pin 52 for fixing the module pieces 40 together in a lateral alignment enables the module pieces 40 to be aligned with each other with high precision, and the structure is simple and easy to implement, and in addition, no additional structure is added to the module pieces 40, so that the volume of the second electrical connector 2 is not increased, thereby enabling the second electrical connector 2 of the present invention to be more compact. The first side 66 of the conductive housing 60 is recessed inwardly to a depth for receiving the ground plate 90, and the thickness of the ground plate 90 is not greater than the depth of the recess.

The signal terminals 71 are provided in the form of a signal terminal pair 710 for transmitting a pair of differential signals. Each of the signal terminal pairs 710 is received in a corresponding one of the grooves 662 in the conductive housing 60. Each of the signal terminals 71 includes a mating end 73 that mates with the mating first electrical connector 1 in the mating direction, a mounting leg 74 that is mountable on the second circuit board 4, and an intermediate portion 75 between the mounting leg 74 and the mating end 73. The mating end 73 is perpendicular to the mounting foot 74. The mounting leg 74 extends out of the conductive shell 60 in a mounting direction, and the intermediate portion 75 and the mating end 73 are received in the recess 662. And the mating end 73 does not extend beyond the leading edge 63 of the conductive shell 60 in the mating direction. The insulator 80 is disposed on the intermediate portion 75 of the signal terminal 71 such that the signal terminal 71 is not in direct contact with the conductive housing 60. The intermediate portions 75 of the signal terminal pairs 710 may be integrally formed with the insulating member 80, or may be assembled with the insulating member 80. And most of the signal terminals 71 are discretely provided on the signal terminals 71 by the insulating members 80 in the longitudinal direction of the signal terminals 71, i.e., the insulating members 80 are disconnected in the longitudinal direction of the signal terminals 71. The portions of the signal terminals 71 having the discrete insulators 80, which are not held in the insulators 80, are suspended in the grooves 662 and exposed to the air, so that it is easier to adjust the impedance matching between the signal terminals, providing better conditions for stable transmission of high-frequency signals. The length of each signal terminal 71 exposed to the air is longer than the length of the signal terminal wrapped in the insulator 80, the middle part 75 of each signal terminal 71 is held in the insulator 80 and is divided into a first part 753, the part exposed to the air is divided into a second part 755, and the width dimension of the first part 753 is smaller than that of the second part 755. In a specific implementation, the two signal terminals 71 forming the signal terminal pair 710 are coupled edge to edge, and two opposite edges of the first portion 753 of each signal terminal are recessed into each other. The signal terminal pair 710 includes a first signal terminal 711 and a second signal terminal 712, and a length of the first signal terminal 711 is greater than a length of the second signal terminal 712 on a signal transmission path. The length of the first signal terminal 711 exposed to the air is longer than the length of the second signal terminal 712 exposed to the air, and particularly, the first portion 753 of the first signal terminal 711 held in the insulator 80 may be exposed to the air from one side, and the first portion 753 of the second signal terminal 712 held in the insulator 80 is not exposed to the air. Each of the mating terminals 73 includes a front contact point 731 and a rear contact point 733 arranged in front and rear along the mating direction, when the mating terminal is mated with the first electrical connector 1, the front contact point 731 and the rear contact point 733 have two contact points along the mating direction with the terminal 20 of the mated first electrical connector 1, and the two contact points effectively solve the influence of the capacitance effect of single point contact on impedance matching during high-speed signal transmission, improve impedance matching after interconnection, and improve insertion loss.

The ground plate 90 is disposed at the first side 66 of the conductive housing 60. The ground plate 90 includes a first side 91 and a second side 92 opposite the first side 91. The second side 92 of the ground plate 90 is engaged with the first side 66 of the conductive housing 60, and the ground plate 90 has a plurality of holes 95 extending transversely through the first side 91 and the second side 92. The hole 95 is matched with the convex hull 664 on the conductive shell 60, the hole 95 is punched from the second side 92 to the first side 91 and forms a tear face 951, the tear face 951 faces the first side 91, the hole is flared, and the size of the second side 92 is larger than that of the first side 91. A plurality of circumferentially distributed slots 953 are provided in the bore 95, and the bore 95 is expanded to mate with the boss 664 during mating with the boss 664. The ground plate 90 is provided with a plurality of holes 95 which are matched with the convex hulls 664 on the convex ribs 663 on the conductive shell 60, so that the ground plate 90 is contacted with the conductive shell 60 at multiple points, the crosstalk problem in a loop is effectively reduced, and the shielding effect is good. The ground plate 90 includes a flat plate portion 910, a contact portion 911 extending from the flat plate portion 910 in a mating direction, and a plurality of pin 913 of a fisheye structure extending from the flat plate portion 910 in a mounting direction and mountable on the second circuit board 4, the pin 913 being located in the same plane as the mounting pins 74 of the signal terminals 71, the pin 913 being disposed between the mounting pins 74 of the adjacent signal terminal pairs 710, the pin being integrally punched 913 out of the ground plate 90, and being bent from the plane of the ground plate 90 to the plane of the signal terminals 71. The length of the contact portion 911 extending in the mating direction is the same as the length of the conductive housing 60 extending in the mating direction. The contact portion 911 is closer to the conductive housing 60 than the flat plate portion 910, so that when the module pieces 40 are assembled together, a certain distance is left between the contact portion 911 of the adjacent side of two adjacent module pieces 40 and the conductive housing 60, so that the first mating portion 313 of the first shielding piece 31 of the first electrical connector 1 can extend into between the adjacent module pieces 40, wherein the flat plate portion 315 of the first mating portion 313 is in contact fit with the conductive housing 60, and the contact dome 319 and the contact portion 911 are in contact fit with each other. The conductive housing 60 and the ground plate 90 cooperate with each other to form a circumferentially closed shielding channel in each of the recesses 662, so that a pair of signal terminals 71 located in the channels are circumferentially surrounded by the shielding in all directions on the entire transmission path, and the influence of crosstalk between the signal terminal pairs 710 is reduced to an optimal state to achieve higher-speed signal transmission.

The module piece 40 comprises a first type module piece 41 and a second type module piece 42 arranged at a distance from the first type module piece 41, and a recess 45 is arranged at the upper edge 62 and the lower edge 61 of the conductive shell 60 of one of the first type module piece 41 and the second type module piece 42 near the front edge 63. When the first module piece 41 and the second module piece 42 are assembled together, the mounting groove 451 and the protrusion 453 are formed opposite to each other, the mounting groove 451 and the protrusion 453 are matched with the guide protrusion 121 and the guide groove 123 of the first electrical connector 1 to form a guide matching mechanism, when the module piece 40 is assembled, the signal terminal 71 is firstly fixed in the insulating member 80, and then the fixed signal terminal 71 is assembled in the corresponding groove 662 of the conductive shell. Finally, a ground plate 90 is mounted to one side of the conductive housing 60 to shield the signal terminals 71 in the grooves 662.

After the first electrical connector 1 and the second electrical connector 2 are mated, each pair of terminals 20 and the corresponding pair of signal terminals 710 are mated with each other to form a pair of signal paths, the first shielding plate 31 can be mechanically and electrically connected with the ground plate 90 and the conductive housing 60 on the adjacent side of the two adjacent module plates 40, and the second shielding plate 32 and the rib 663 on the conductive housing 60 are mated with each other to completely shield the terminals 20 and the signal terminals 71 of a pair of signal paths in the circumferential direction on a transmission path, so that an electromagnetic crosstalk shielding effect is good. And the structure is simple and reliable, and better conditions are provided for stable transmission of high-frequency signals.

The above description is only one embodiment of the present invention, and not all or only one embodiment, and any equivalent changes to the technical solution of the present invention, which are made by a person skilled in the art through reading the description of the present invention, are covered by the claims of the present invention.

Claims

1. An electric connector is used for being installed on a circuit board and matched with a butting connector, the electric connector comprises a plurality of module pieces which are transversely stacked, each module piece comprises a conductive shell, a plurality of signal terminals which are contained in the conductive shell and an insulating piece which is coated on each signal terminal and installed on the conductive shell, a plurality of grooves are formed in one side of the conductive shell, the signal terminals are contained in the corresponding grooves, and the insulating piece electrically isolates the signal terminals from the conductive shell, and the electric connector is characterized in that: the insulating member outside at least one of the signal terminals is discretely disposed in a path of signal transmission.

2. The electrical connector of claim 1, wherein: the groove has the same profile as the insulator.

3. The electrical connector of claim 2, wherein: the part of the signal terminal which is not covered by the insulating piece is suspended in the groove and exposed in the air.

4. The electrical connector of claim 3, wherein: the length of the signal terminal exposed in the air is longer than the length of the signal terminal coated on the insulating piece.

5. The electrical connector of claim 4, wherein: the width dimension of the terminal coated in the insulating piece is smaller than the width dimension exposed in the air.

6. The electrical connector of claim 5, wherein: the signal terminals are arranged in a signal terminal pair mode and used for transmitting a pair of differential signals, the two signal terminals forming the signal terminal pair are contained in the same groove, each signal terminal comprises a mounting pin mounted on a circuit board, a matching part matched with a butting connector and a middle part between a butting end and a mounting part, the mounting pin extends out of the conductive shell in the mounting direction, and the middle part and the butting end are contained in the groove.

7. The electrical connector of claim 6, wherein: the signal terminals forming the signal terminal pair include a first signal terminal and a second signal terminal, the length of the first signal terminal is greater than the length of the second signal terminal, and the size of the first signal terminal exposed to air is greater than the size of the second signal terminal exposed to air.

8. The electrical connector of claim 6, wherein: the intermediate portion of the signal terminal is integrally formed with the insulating member.

9. The electrical connector of claim 6, wherein: the intermediate portion of the signal terminal is assembled to the insulator.

10. The electrical connector of claim 8, wherein: the module piece also comprises a laminar grounding plate which is arranged on one side of the conductive shell and used for closing the grooves, and the grounding plate is electrically contacted with the conductive shell so that the grooves respectively form a shielding channel which is closed in the circumferential direction.