CN113131236B

CN113131236B - Electric connector

Info

Publication number: CN113131236B
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: Foxconn Interconnect Technology Ltd
Current assignee: Foxconn Interconnect Technology Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2023-05-16
Anticipated expiration: 2039-12-31
Also published as: TW202131564A; CN113131236A

Abstract

The invention discloses an electric connector which is used for being mounted on a circuit board and matched with a butt 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 which are accommodated in the conductive shell, and an insulating piece which is coated outside each signal terminal and mounted on the conductive shell, one side of the conductive shell is provided with a plurality of grooves, the signal terminals are accommodated in the corresponding grooves, the insulating piece electrically isolates the signal terminals from the conductive shell, and at least one insulating piece outside the signal terminals is discretely arranged on a signal transmission path.

Description

Electric connector

[ field of technology ]

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

[ background Art ]

U.S. patent No. 6,988,902 issued 24/1/2006 discloses a combination of a plug electrical connector and a receptacle electrical connector, wherein the plug electrical connector and the receptacle electrical connector each include a plurality of columns of terminals, each column of terminals includes differential signal pairs and a ground terminal disposed between adjacent differential signal pairs, each differential signal pair of each column is disposed offset from a corresponding differential signal pair of an adjacent column, and no metal shield is disposed between adjacent columns, and although crosstalk can be reduced to some extent by the offset arrangement of the differential pairs, transmission of lower differential signals of 6Gbps and below can be achieved, as differential signal transmission speeds are increased, the speed of transmission of differential signals of many pairs has reached 25Gbps at present, and even higher reaches 56Gbps, so that it has been difficult for such a simple offset arrangement to satisfy transmission of high-speed signals.

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

[ invention ]

The technical problems to be solved by the invention are as follows: an electric 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 for mounting on a circuit board and mating with a mating connector, the electrical connector includes a plurality of module pieces stacked in a transverse direction, each module piece includes a conductive housing, a plurality of signal terminals received in the conductive housing, and an insulating member wrapped around each signal terminal and mounted on the conductive housing, a plurality of grooves are formed on one side of the conductive housing, the signal terminals are received in the corresponding grooves, the insulating member electrically isolates the signal terminals from the conductive housing, and at least one insulating member outside the signal terminals is disposed discretely on a signal transmission path.

Compared with the prior art, the electric connector provided by the invention adjusts the impedance matching between the signal terminals by discretely arranging the insulating pieces on the signal transmission path, thereby providing better conditions for stable transmission of high-frequency signals.

[ description of the drawings ]

Fig. 1 is a perspective view of a first electrical connector and a mating second electrical connector 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 shown in 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 of the first electrical connector of fig. 6 in another orientation.

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

Fig. 9 is a perspective view of a first shield blade and a second shield blade 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 of the second electrical connector of fig. 10 in another orientation.

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

Fig. 13 is a partially exploded view of one of the modular segments shown in fig. 12.

Fig. 14 is a further exploded view of one of the modular segments shown in fig. 13.

Fig. 15 is a further exploded view of the other direction of one of the modular segments shown in fig. 14.

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

Fig. 17 is a perspective view of the ground plate of one of the dies shown in fig. 15 mated with a conductive housing.

Fig. 18 is a flow chart of the assembly of one die shown in fig. 12.

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

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

[ Main reference numerals Specification ]

First electrical connector 1 and second electrical connector 2

First circuit board 3 second circuit board 4

Housing 10 terminal 20

First shielding sheet 31 second shielding sheet 32

A bottom wall 11 and a side wall 12

Mounting hole 111 of accommodation space 13

Guide groove 123 of guide projection 121

Terminal pair 22 mounting portion 211

The main body 215 of the abutting portion 213

Fixed block 23 shields cavity 33

First fitting portion 313 flat plate portion 315

Second matching part 323 of contact spring 319

Die set sheet 40 fixing member 50

Signal terminal 71 of conductive housing 60

Insulating member 80 ground plate 90

Lower edge 61 and upper edge 62

Leading edge 63 trailing edge 64

First side 66 and second side 67

Groove 662 bead 663

Convex hull 664 first bore 68

Second hole 69 first pin 51

Second pin 52 signal terminal pair 710

Mounting feet 74 for butt end 73

First portion 753 of intermediate portion 75

Front contact point 731 of second portion 755

Rear contact 733 first side 91

Second side 92 hole 95

Slotted 953 plate portion 910

Contact 911 pin 913

First type of die set 41 and second type of die set 42

Recess 45 mounting groove 451

First signal terminal 711 of protrusion 453

Second signal terminal 712 ground leg 327

Side wall 632 surface 660

Tear-away surface 951

[ detailed description ] of the invention

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, 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 a 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 comprises a housing 10, a plurality of terminals 20 held on the housing 10, a plurality of first shielding plates 31 arranged laterally shielding the terminals 20, and a plurality of second shielding plates 32 arranged longitudinally 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 both ends of the bottom wall 11 and disposed at intervals, and the bottom wall 11 and the two side walls 12 together enclose a housing space 13. The bottom wall 11 includes a plurality of mounting holes 111 extending through the bottom wall 11 in rows and columns. 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 accommodating space 13. The housing 10 may be made of pure metal, or may be made of plastic material and then electroplated to form a conductive surface, or may be made of pure plastic material.

Two adjacent terminals 20 are arranged in terminal pairs 22, each terminal pair 22 for transmitting 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 accommodating space 13, and a main body portion 215 between the mounting portion 211 and the mating portion 213. Further, the fixing block 23 is integrally formed with the main body 215 of the pair of terminals 20, and the fixing block 23 cooperates with the mounting hole 111 on the bottom wall 11 to fix the pair of terminals 20 to the bottom wall 11. Of course, if the housing is made of pure plastic, the terminal 20 may be directly mounted on the bottom wall 11 without the fixing block 23.

The plurality of first shielding plates 31 are parallel to each other, and the plurality of second shielding plates 32 are parallel to each other. The plurality of first shielding plates 31 and the plurality of second shielding plates 32 are disposed to intersect each other. Preferably, in this embodiment, the plurality of first shielding plates 31 and the plurality of second shielding plates 32 are perpendicular to each other, so as to form a plurality of shielding cavities 33 spaced from each other. Each of the terminal pairs 22 is distributed in the corresponding shield cavity 33 such that one first shield plate 31 is provided between each of the terminal pairs 22 and the terminal pair 22 adjacent thereto in the transverse direction, and two second shield plates 32 spaced apart from each other are provided between each of the terminal pairs 22 and the terminal pair 22 adjacent thereto in the longitudinal direction. The first shielding plates 31, the second shielding plates 32 and the housing 10 are integrally cast or integrally formed by powder metallurgy. The first shielding plates 31 and the second shielding plates 32 may be integrally cast or integrally formed by powder metallurgy and then assembled on the housing 10, or the first shielding plates 31 and the second shielding plates 32 may be respectively punched from sheet metal and then assembled on the housing 10, where the housing 10 may be formed by casting or powder metallurgy, or a plastic material may be formed by injection molding and then electroplated to form a conductive surface, or a plastic material may be formed by injection molding. Each of the first shield blades 31 includes a first fitting portion 313 extending upward into the accommodating space 13. The first mating portion 313 includes a plate portion 315 and a plurality of contact spring pieces 319 extending from the plate portion 315. The second shielding plate 32 includes a second mating portion 323 extending into the accommodating space 13, the first mating portion 313 extends into the accommodating space 13 to a size larger than the size of the abutting portion 213 of the terminal 20 extending into the accommodating space 13, and the second mating portion 323 extends into the accommodating space 13 to a size smaller than the size of the terminal 20 entering the accommodating space 13. The second shielding plate 32 further includes a plurality of grounding pins 327 extending downward for being mounted on the first circuit board 3, and the first shielding plate 31 is not provided with grounding pins.

The terminal pairs 22 of the first electric connector 1 of the present invention are completely shielded by the first shielding sheet 31 and the second shielding sheet 32 in the circumferential direction, the shielding effect of the first electric connector 1 is improved, and two spaced apart second shielding sheets 32 are provided between each terminal pair 22 and the adjacent terminal pair 22 in the longitudinal direction, the shielding effect is better, and better conditions are provided 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 one body, each of the module pieces 40 includes a conductive housing 60, a plurality of signal terminals 71 accommodated 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 is conductive and has good heat dissipation, and the conductive housing 60 may be cast, powder metallurgy, injection molded, electroplated with a conductive surface, or other process. 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 mated first electrical connector 1, and a rear edge 64 opposite the front edge 63.

The conductive housing 60 is in a sheet shape, and has a first side 66 and a second side 67 disposed opposite to each other in the thickness direction, wherein a plurality of grooves 662 are formed in the first side 66, and each groove 662 is recessed from the first side 66 toward the conductive housing 60 and extends from the front edge 63 to the lower edge 61. The recess 662 is aligned with the signal terminal 71 for receiving the signal terminal 71. The insulator 80 has the same contour shape as the groove 662 for being accommodated in the conductive housing 60. Opposite ribs 663 are formed on both sides of each groove 662 of the conductive housing 60. The rib 663 includes a face 660 at the first side 66 and a side wall 632 connected to the recess 662, the side wall 632 being mechanically and electrically connected to the second mating portion 323 of the second shielding tab 32 of the first electrical connector 1 near the front edge. The surface 660 of the convex rib 663 is provided with a plurality of convex hulls 664. The convex hull 664 and the conductive shell 60 are cast integrally, or may be formed by coating a conductive material after injection molding. The convex hull 664 is cylindrical or square or other shape, and in the preferred embodiment the convex hull 664 is configured as a cylinder. The region between the outermost rib 663 and the upper and rear edges 62, 64 of the conductive housing 60 is provided with a plurality of first holes 68 extending transversely through the conductive housing 60 and a second hole 69 having a different shape from the first holes 68, the plurality of first holes 68 being disposed adjacent the upper and rear edges 62, 64 and disposed in first and second mutually perpendicular directions. The second holes 69 are disposed near the junction of the upper edge 62 and the rear edge 64 and inside the plurality of first holes 68, which are elongated and have a length of the first holes 68 in a first direction, and a length of the first holes 68 in a second direction, which is along the second direction. The second holes 69 are triangular and rounded at three corners, the second holes 69 having a size larger than the sum of the sizes of all the first holes 68. The first apertures 68 of each of the die set tabs 40 are aligned with one another and the second apertures of each of the die set tabs 40 are aligned with one another. The fixing member 50 includes each first pin 51 passing through each of the first holes 68 and one 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 of metal and plastic. The first pins 51 and the second pins 52 combine to fix the module pieces 40 together in a laterally aligned manner, so that the module pieces 40 have high accuracy of mutual alignment, simple structure and easy implementation, and no additional other structure is added to the module pieces 40, so that the volume of the second electrical connector 2 is not increased, and the structure of the second electrical connector 2 is more compact. The first side 66 of the conductive housing 60 is recessed inwardly to a depth for mounting the ground plate 90, and the thickness of the ground plate 90 is no greater than the depth of the recess.

The signal terminals 71 are arranged in the form of signal terminal pairs 710 for transmitting a pair of differential signals. Each of the signal terminal pairs 710 is received in a corresponding one of the recesses 662 in the conductive housing 60. Each of the signal terminals 71 includes a mating end 73 that mates with the mated first electrical connector 1 in the mating direction, a mounting foot 74 that is mountable on the second circuit board 4, and an intermediate portion 75 between the mounting foot 74 and the mating end 73. The docking end 73 is perpendicular to the mounting foot 74. The mounting leg 74 extends out of the conductive housing 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 housing 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 portion 75 of the signal terminal pair 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 arranged on the signal terminals 71 with the insulators 80 being discrete in the length direction of the signal terminals 71, i.e., the insulators 80 are open in the length direction of the signal terminals 71. The portions of the signal terminals 71 having discrete insulators 80 not held in the insulators 80 are suspended within the recesses 662 and exposed to air, making it 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 air is longer than the length of the insulating member 80, and the middle portion 75 of each signal terminal 71 is held in the insulating member 80 in a first portion 753, the portion exposed to air is a second portion 755, and the width dimension of the first portion 753 is smaller than the width dimension of the second portion 755. In a specific implementation, the two signal terminals 71 that form the signal terminal pair 710 are coupled from narrow side to narrow side, and the two opposite narrow sides of the first portion 753 of each signal terminal are recessed toward 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 air is longer than the length of the second signal terminal 712 exposed to air, and in particular the first portion 753 of the first signal terminal 711 held in the insulator 80 may be exposed to air from one side, and the first portion 753 of the second signal terminal 712 held in the insulator 80 is not exposed to air. Each of the mating ends 73 includes a front contact point 731 and a rear contact point 733 disposed front and rear along the mating direction, and when mating 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 terminals 20 of the first electrical connector 1, where the front and rear contact points effectively solve the influence of the capacitive 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 on 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 mates 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 mates with the convex hull 664 on the conductive housing 60, the hole 95 being punched from the second side 92 toward the first side 91 and forming a tear-away surface 951, the tear-away surface 951 being oriented toward the first side 91, the hole being flared and the second side 92 being larger in size than the first side 91. The holes 95 are provided with a plurality of circumferentially distributed slots 953, and the holes 95 are spread apart to mate with the convex hull 664 during mating with the convex hull 664. The grounding 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 grounding plate 90 is in multi-point contact with the conductive shell 60, 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 the mating direction, and a plurality of pins 913 having a fish-eye structure extending from the flat plate portion 910 in the mounting direction and being mountable on the second circuit board 4, the pins 913 being positioned on the same plane as the mounting pins 74 of the signal terminals 71, and the pins 913 being provided between the mounting pins 74 of the adjacent signal terminal pairs 710, the pins 913 being integrally punched out of the ground plate 90 and being bent from the plane in which the ground plate 90 is positioned to the plane in which the signal terminals 71 are positioned. The contact portion 911 extends in the mating direction by the same length as the conductive housing 60 extends in the mating direction. The contact portions 911 are closer to the conductive housing 60 than the plate portions 910, so that when the module pieces 40 are assembled together, there is a distance between the contact portions 911 on adjacent sides of two adjacent module pieces 40 and the conductive housing 60, so that the first fitting portions 313 of the first shielding plates 31 of the first electrical connector 1 can extend into between the adjacent module pieces 40, wherein the plate portions 315 of the first fitting portions 313 are in contact-fit with the conductive housing 60, and the contact spring pieces 319 are in contact-fit with the contact portions 911. The conductive housing 60 and the ground plate 90 cooperate to form a circumferentially closed shielding channel for each of the recesses 662, so that the pair of signal terminals 71 located in the channel are shielded from all directions circumferentially throughout the transmission path, and the crosstalk effect between the signal terminal pairs 710 is reduced to an optimal level for higher rate signal transmission.

The module piece 40 includes a first module piece 41 and a second module piece 42 spaced from the first module piece 41, and a recess 45 is provided at an upper edge 62 and a lower edge 61 of the conductive housing 60 of one of the first module piece 41 and the second module piece 42 near a front edge 63. When the first module piece 41 and the second module piece 42 are assembled together to form the opposite mounting groove 451 and the protrusion 453, the mounting groove 451 and the protrusion 453 are mutually matched with the guide protrusion 121 and the guide groove 123 of the first electric connector 1 to form the guide matching mechanism, the signal terminal 71 is fixed in the insulating member 80 when the module piece 40 is assembled, and then the fixed signal terminal 71 is assembled in the corresponding groove 662 on the conductive housing. Finally, a ground plate 90 is mounted to one side of the conductive housing 60 to shield the signal terminals 71 in the recesses 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 to form a pair of signal paths, the first shielding sheet 31 may be mechanically and electrically connected to the ground plate 90 and the conductive housing 60 on the adjacent sides of the two adjacent module sheets 40, and the second shielding sheet 32 and the ribs 663 on the conductive housing 60 are mated to each other to form a complete shielding effect on the transmission path of the terminals 20 and the signal terminals 71 of the pair of signal paths, so as to have a better effect of shielding electromagnetic crosstalk. And the structure is simple and reliable, and better conditions are provided for stable transmission of high-frequency signals.

The foregoing is merely one embodiment, not all or a mere embodiment, and any equivalent variations on the technical solution of the present invention by those skilled in the art through reading the specification of the present invention are covered by the claims of the present invention.

Claims

1. An electric connector for install to the circuit board and cooperate with butt joint connector, electric connector includes a plurality of module pieces of horizontal stack setting, each module piece include conductive shell, accept in conductive shell's a plurality of signal terminal and cladding in each signal terminal and install in conductive shell's insulating part, conductive shell one side is equipped with a plurality of recesses, signal terminal accept in corresponding in the recess, the insulating part will signal terminal with conductive shell electricity keeps apart its characterized in that: the insulating parts outside at least one signal terminal are arranged in a discrete manner on a signal transmission path, the signal terminals are arranged in a signal terminal pair mode and are used for transmitting a pair of differential signals, and the two signal terminals forming the signal terminal pair are arranged at intervals up and down and are accommodated in the same groove.

2. The electrical connector of claim 1, wherein: the recess having the same contour as the insulating member _。

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 to air.

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

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

6. The electrical connector of claim 5, wherein: each signal terminal comprises a mounting pin, a butt joint end and a middle part, wherein the mounting pin is mounted on the circuit board, the butt joint end is matched with the butt joint connector, the middle part is arranged between the butt joint end and the mounting pin, the mounting pin extends out of the conductive shell towards the mounting direction, and the middle part and the butt joint end are accommodated 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 first signal terminal having a length greater than a length of the second signal terminal, the first signal terminal having a dimension exposed to air greater than a dimension 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 lamellar grounding plate which is arranged on one side of the conductive shell and used for sealing the grooves, and the grounding plate is electrically contacted with the conductive shell so that the grooves respectively form a shielding channel which is sealed in a circumferential direction.