# Patent

## Title
Flippable electrical connector

## Abstract

A receptacle connector mounted to the printed circuit board, includes an insulative housing defining a mating tongue and a metallic shell enclosing the housing to form a mating cavity in which said mating tongue forwardly extends. A complementary plug connector includes a shell with a bull-nose tip. A metallic piece is mounted around a root of the mating tongue and equipped with a plurality of spring tangs to contact the relatively rigid bull-nose tip of the shell of the complementary connector for EMI/RFI protection.

## Background
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation application of Ser. No. 14/565,453, filed on Dec. 10, 2014, the contents of which are incorporated entirely herein by reference.


BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electrical connector, and more particularly to a flippable plug connector used with a receptacle connector.
2. Description of Related Art
In the previously filed provisional applications, the plug connector is “flippable” whereas we turn the plug over and it functions the same top and bottom. In order to be able to handle switching of the super speed signaling, a MUX (or SS switch) is built into the silicon. This can be costly and also cause some additional degredation in the super speed signals. Recently, in comparison with the so-called external shielding effect during mating by means of the metallic outer shell of the plug connector enclosed in the metallic outer shielding of the receptacle connector, an attempt by others enhancing the shielding effect was made to provide additionally the so-called internal shielding effect between the receptacle connector and the plug connector during mating by providing a metallic collar around the root portion of the mating tongue of the receptacle connector and a pair of metallic spring plates under the shell of the plug connector to mechanically and electrically connect to the collar of the receptacle connector, wherein such a collar includes a rear section mechanically and electrically connected to an interior surface of the shielding. Anyhow, in such others' design, the collar of the receptacle connector is stiff and stationary, thus inevitably requiring the pair of spring plates provided by the plug connector for intimately coupling.
Hence, a simple structure of the electrical plug connector and that the complementary receptacle connector with less parts are desired.
SUMMARY OF THE INVENTION
Accordingly, the object of the present invention is to provide a receptacle connector adapted for engagement with a complementary plug connector, comprising: an insulative housing defining a base and a mating tongue forwardly extending therefrom, the mating tongue defining a step structure about a root thereof; a plurality of contacts disposed in the housing with contacting sections exposed upon the mating tongue; a metallic shell enclosing the housing to define a mating cavity in which the mating tongue is disposed; and an EMI element being assembled to the base to cover opposite top and bottom surfaces; wherein the EMI element defines a plurality of spring tangs to be seated upon a rear portion of the mating tongue so as to allow a bull-nose tip of a shell of the complementary plug connector to abut against an exterior surface or an interior surface of the spring tang for EMI/RFI protection.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an illustrative side view of a receptacle connector of a first embodiment, showing how the receptacle connector is inserted with a plug connector in sequence;
FIG. 2 is an illustration side view of a receptacle connector and a plug connector mated with each other of a second embodiment;
FIG. 3 is an illustration side view to show how the plug connector is mated with the receptacle connector of FIG. 2 in sequence;
FIG. 4 is an assembled perspective view of a receptacle connector of a third embodiment mounted on a printed circuit board;
FIG. 5 is an assembled perspective view of a terminal seat and an EMI bracelet of the receptacle connector of FIG. 4;
FIG. 6 is an exploded perspective view of the terminal seat and the EMI bracelet of FIG. 5;
FIG. 7 is similar to FIG. 6, wherein the EMI bracelet is being assembled to the terminal seat;
FIG. 8 is similar to FIG. 7, the bracelet is assembled to the step structure;
FIG. 9 is a side illustration view of the terminal seat and the EMI collar of FIG. 8 mounted on the printed circuit board;
FIG. 10 is an assembled perspective view of a plug connector for mating with the receptacle connector of FIG. 4;
FIG. 11 is a cross-sectional view of the mated plug connector of FIG. 10 and the receptacle connector of FIG. 4;
FIG. 12 is a cross-sectional illustrating view of a plug connector of another embodiment similar to FIG. 10, which includes a card paddle;
FIG. 13 shows the paddle card of the plug connector;
FIG. 14 is an assembled perspective view of a plug connector of a fourth embodiment of the instant invention;
FIG. 15 is an exploded perspective view of the plug connector of FIG. 14;
FIG. 16 is a perspective view of the receptacle connector of a fifth embodiment without the metallic shell thereof;
FIG. 17 is an illustrate view of the receptacle connector with metallic shell of FIG. 16;
FIG. 18 is an illustrative view of the mated receptacle connector and the complementary plug connector of the fifth embodiment;
FIG. 19 is an assembled perspective view of a receptacle connector of the sixth embodiment mounted on the printed circuit board;
FIG. 20 is a partially exploded perspective view of the receptacle connector and the printed circuit board of FIG. 19;
FIG. 21 is an exploded perspective view of the terminal seat of the receptacle connector of FIG. 20;
FIG. 22 is a cross-sectional view of the receptacle connector mounted on the PCB taken along lines 22-22 of FIG. 19;
FIG. 23 is an elevational view of the shell and the housing of FIG. 19 wherein the shell is extended in a plane to show how to make a robust connector;
FIG. 24 is an upside down perspective view of metallic shell of the receptacle connector of FIG. 19;
FIG. 25 is an upside down perspective view of receptacle connector of FIG. 19;
FIG. 26 is a front elevational view of the receptacle connector of FIG. 25;
FIG. 27 is a perspective view of a receptacle connector mounted on the printed circuit and a plug connector of a seventh embodiment of the instant invention;
FIG. 28 is an exploded perspective view of the receptacle connector and the printed circuit board of FIG. 27;
FIG. 29 is a perspective view of the receptacle connector of FIG. 27 without metallic shell to show how the contacts are disposed/assembled in the housing;
FIG. 30 is a perspective view of the contacts of the receptacle connector of FIG. 27 to show the balanced arrangement thereof;
FIG. 31 is an exploded perspective view of the contacts of the receptacle connector of FIG. 30;
FIG. 32 is a top perspective view of the mated paddle card of the plug connector and the contacts of the receptacle connector; and
FIG. 33 is a bottom perspective view of the mated paddle card of the plug connector and the contacts of the receptacle connector.



DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Reference will now be made in detail to the preferred embodiment of the present invention.
FIG. 1 shows a receptacle connector 100a of a first embodiment of this instant invention, showing how the receptacle connector 100a is mated with a plug connector. The housing 11 of the receptacle connector 100a include base 111 and a mating tongue 112 forwardly extending therefrom wherein the rear portion of the mating tongue 112 defines a step structure 113 thereof. A one piece U-shaped metallic plate 12 (i.e., a side view) is rearwardly assembled to the base 111 to cover the opposite top and bottom faces and a front face of the base 111 wherein vertical portions of the metallic plate 12 were split therefrom to form top and bottom spring fingers 121 essentially seated upon the step structure 113. The bull-nose tip 221 of the metallic shell 22 of the complementary plug connector 200a abuts against the exterior surfaces of said spring fingers 121 for EMI/RFI protection.
FIG. 2 shows a receptacle connector 100b and a plug connector 200b mated with each other of a second embodiment of this instant invention. FIG. 3 shows how the receptacle connector 100b is mated with the plug connector 200b. The receptacle connector 100b includes a pair of metallic bracelets 16 each defines a U-shaped structure assembled to the base. In this embodiment, the bracelets 16 are assembled to the base sidewardly instead of rearwardly. The spring fingers 161 are able to be a complete manner without necessity to be alternately arranged with each other in two rows, and the rear portions 162 of the bracelets 16 abut against the metallic shell 15 of the receptacle connector 100b. The spring fingers 161 are inserted into the plug connector 200b to contact the interior side of the bull-nose tip 261 of the shell 26 of the plug connector 200b. 
FIGS. 4-9 show a receptacle connector 300 of a third embodiment of the invention wherein the receptacle connector 300 is mounted upon the printed circuit board (PCB) P and includes an insulative housing 31 composed of a base 311 and a mating tongue 312 forwardly extending therefrom with a step structure 313 around a root area of the mating tongue 312. A plurality of contacts is disposed on the insulative housing to form a terminal seat. As best shown in FIGS. 5 and 6, a metallic EMI bracelet 32 is secured to the base 311 and includes a retention plate 321 with bumps 3211 thereon to contact the metallic shell 33 of the receptacle connector 300, and a plurality of spring fingers 322 extending from a frame structure 323 commonly surrounding the step structure 313 so as to contact the inner surface of the extended tip section 411 of the metallic shell 41 of a plug connector 400 for EMI/RFI protection as shown in FIGS. 10 and 11. The bracelet 33 includes a hook structure 324 retained in the corresponding slot 314 of the base 311 as shown in FIG. 7. As best shown in FIGS. 7-9, the bracelet 33 is assembled to the insulating housing 31 along a front-to-rear direction, when the bracelet 33 arrives at the step structure 313, the hook structure 324 is firstly assembled to the slot 314 and then the frame structure 323 is pushed to abut against a front face of thee base 311 so that the retention plate 31 is retained to a top of the base 311.
FIGS. 12-13 show an improved plug connector 400a of another embodiment, which has a paddle card 42 with a grounding pad 421 around the front edge so as to have the rear edge of the corresponding latch 43 mechanically and electrically connected thereto. During mating, a front hook section (not labeled) of the latch 43 may mechanically and electrically connect to the corresponding lateral notches (not labeled) in the shielding plate 37 shown in FIG. 7 of the mated receptacle connector 300 wherein the shielding plate has legs 372 mounted to the printed circuit board on which the receptacle connector is seated.
FIGS. 14-15 show a plug connector 400b of a fourth embodiment, which includes an insulative housing 44 with a metallic EMI bracelet 45 circumferentially attached upon a front end thereof. The EMI bracelet 45 forms a plurality of inwardly extending spring fingers 451 through the corresponding cutout 441 in the housing 44 into the corresponding mating port. A metallic shell 46 encloses the housing 44 to sandwich the bracelet 45 therebetween. An insulative film 47 is circumferentially attached upon a rear area of the housing to protect the contacts from touching the shell. Therefore, during mating with a corresponding receptacle connector, the spring fingers 451 may inwardly abut against the collar structure of the EMI piece located on a step structure formed on a root area of the mating tongue of the receptacle connector.
FIGS. 16-18 shows a receptacle connector 500 of a fifth embodiment, which includes a metallic bracelet 52 sandwiched between the insulative base 511 and the metallic shell 53 with a plurality of forwardly extending spring fingers 521 extending into the mating cavity 50 so as to abut against an exterior surface of the bull-nose tip region 611 of the metallic shell 61 of the complementary plug connector 600 for EMI/RFI protection wherein the bracelet 51 is much thinner and more flexible than the shell 53.
FIGS. 19-25 show a receptacle connector 700 of a sixth embodiment another which is mounted on a notch P1 of the PCB P. The receptacle connector 700 includes a top insert molding part 71 composed of the contacts 73 retained by the top insulative housing 711, and a main insert molding part 72 composed of the reinforcement metallic plate 74 enclosed in the main insulative housing 721. The top insert molding part 71 is downwardly assembled upon the main insert molding part 72 and commonly enclosed by a metallic shell 74 for mounting to the printed circuit board P1. The main insert molding part includes a rear base 721a and a front tongue 721b, the front tongue 721b defines a plurality of grooves 725, the top insert molding part 711 is only in a form of a rear base 711a with a plurality of holes defined on a bottom surface thereof. As best shown in FIG. 22, the contacts 73 are embedded in a bottom of the top insulative housing 711 with a compared simply manufacture process. The contacting sections 731 of the upper contacts 73 extending beyond a front face of the rear base 711a, are received in the grooves 725 on the front tongue 721b when the two parts are assembled together, wherein the front tongue is constructed as a mating tongue 72a and the rear bases 711a, 721b are constructed as a base 72b. The shielding plate 74 has a central front projection 741 beyond a corresponding front face of a mating tongue 72a of the main insert molding part 72. In this embodiment, the main insert molding part has no contacts thereon as best shown in FIG. 22 while maybe equipped with contacts, if necessary. Notably, similar to the previous inventions, the shielding plate 74 forms a pair of notches (not labeled) in two opposite lateral sides for locking with a pair of latches of the complementary plug connector.
The shell 75 may be categorized with a front tongue function region 75a surrounding the mating tongue 72a, a middle retention region 75b fitly encircled the base for the vertical direction and the transverse direction, and a rear retention region 75c for the front-to-back direction, referring to FIG. 22 along the front-to-back direction. On the other hand, referring to FIG. 23, the metallic shell 75 in an extended manner may be categorized with the top wall region 75d, the pair of side wall regions 75e and the pair of bottom wall region 75f. Referring to FIGS. 24-26, the shell 75 defines a pair of recesses 755 to receive a pair of corresponding protrusions 722 of the housing wherein the shell 75 defines a front stopper 756 to limit the forward movement of the protrusion 722, and a rear stopper 757 to limit the rearward movement of the housing. The rear stopper is in a shape of slanting inward tab 7571 protruding into a recess 759 in the base. The shell 75 further includes a pair of front mounting legs 7581 and a pair of rear mounting legs 7582 wherein each of the mounting legs 7581 and 7582 defines a standoff region 7583 seated upon the printed circuit board and a leg 7584 inserted into and soldered within the corresponding hole (not shown) in the printed circuit board. The robust structure between the shell 75 and the housing may maximize the dimension of the whole connector while still keeping the required retention strength between the shell 75 and the housing, and that between the shell 75 and the printed circuit board.
Referring to FIGS. 27-33, a receptacle connector 800 of a seventh embodiment is mounted on an upper surface of the printed circuit board P and mated with a paddle cards 91 of a plug connector 900. The receptacle connector 800 includes an insulative housing 81 defining a receiving slot 811 extending in a transverse direction, a plurality of primary contacts 82a disposed in the housing and by two sides of the receiving slot 811. The primary contacts 82a are categorized with the signal/differential pair contacts 82 and the grounding/power contacts 83 alternately arranged with each other in the transverse direction wherein the signal/differential pair contacts 82 define corresponding contacting sections 821 exposed on one side of the receiving slot 811 alternately while the grounding/power contacts 83 define the corresponding contacting sections 8312 each exposed upon both two opposite sides of the receiving slot 811. In this embodiment, each differential pair contacts 82 have the corresponding contacting sections 821a, 821b exposed upon two opposite sides of the receiving slot. An additional array of secondary contacts 84 are disposed in the housing 81 with corresponding contacting sections 841 in front of said primary contacts 82a and only located on one side of the receiving slot 81.
The flippable plug connector 900 includes a paddle card 91 adapted to be directly coupled to the receptacle connector 800 and defines a primary pads 92 thereon in a front region. Those primary pads 92a are categorized with the signal/differential pair pads 92 and the grounding/power pads 93 alternate arranged with each other along the transverse direction wherein the signal/differential pair pads 92 are alternately arranged with one another on opposite surfaces of the paddle card 91 while each of the grounding/power pads 93 is exposed upon both opposite surfaces of the paddle card 91 for mechanically and electrically connecting to the connecting sections of the corresponding signal/differential pair contacts 82 and those of the grounding/power contacts 83, respectively. An additional array of pads 94 is located behind the primary pads 92a for electrically and mechanically connecting to the corresponding contacting sections 941 of the secondary contacts 84, respectively.
However, the disclosure is illustrative only, and changes may be made in detail, especially in matter of shape, size, and arrangement of parts within the principles of the invention.

## Claims

1. A receptacle connector intended for mounting on a printed circuit board, comprising: a top insert molding part including a top insulating housing equipped with a plurality of upper contacts with contacting sections extending beyond a front face of the top insulating housing; a main insert molding part including a main insulating housing equipped with a metallic plate, the main insulating housing defining a plurality of grooves on a top surface and the metallic plate disposed between the top surface and a lower surface opposite to the top surface, the shielding plate being equipped with a pair of immoveable locking notches in two opposite lateral sides; a metallic shell;
wherein the top insert molding part is assembled and retained on the main insert part and the contacting sections of the top insert molding art are received in the grooves of the main insert molding part so that a mating tongue is constructed;
wherein the main insert molding part includes a rear base and a front tongue, the grooves are disposed on the top surface of the front tongue, the opposite lateral sides of the shielding plates protrude beyond corresponding lateral sides of the front tongue;
wherein said metallic shell enclosing the insulating housing; wherein the metallic shell comprises a front region surrounding the mating tongue to defines a mating cavity among the mating tongue the front region into which a plug connector is inserted in either of two insertion orientations, a middle retention region encircled the base and confronting against a pair of rear protrusions and a rear region with a rear stopper to limit a rearward movement of the insulating housing.

2. The receptacle connector as claimed in claim 1, wherein the rear stopper bends inward and presses against a rear face of base.

3. The receptacle connector as claimed in claim 1, wherein the front region defines a pair of front mounting legs and the rear region defines a pair of rear mounting legs.

4. The receptacle connector as claimed in claim 3, wherein each of the mounting legs defines a standoff region intended to stand on the printed circuit board.

5. The receptacle connector as defined claim 1, comprising:
a plug connector for coupling with the receptacle connector;
the plug connector comprises:
an insulative housing defining a receiving cavity;
a plurality of plug contacts disposed in opposite sides of receiving cavity of the insulative housing,
a metallic latch retained in the insulative housing and including a pair of resilient latching arms located in opposite lateral ends of the receiving cavity and protruding into the receiving cavity in a first direction; and
a one-piece metallic EMI bracelet enclosing a front end region of an exterior surface of the insulative housing with a plurality of spring fingers protruding into the receiving cavity in a second direction perpendicular to the first direction.

6. The plug connector as claimed in claim 5, wherein the front end region of insulative housing defines a plurality of slots, the spring fingers extend through the corresponding slots into the receiving cavity.

7. The receptacle connector as claimed in claim 1, wherein the main insert molding part includes a rear base and a front tongue, the grooves are disposed on the top surface of the front tongue, the opposite lateral sides of the shielding plates protrude beyond corresponding lateral sides of the front tongue.

8. The receptacle connector as claimed in claim 7, wherein the top insert molding part includes a base without any front tongue, the bases of the top insert molding part and the main insert molding part are retained together and are defined as a rear base on which the metallic shell is retained.

9. The receptacle connector as claimed in claim 8, wherein the metallic shell include a middle region fitly encircled the base and confronting against a pair protrusions rearward and a rear region including a rear stopper to limit a rearward movement of the base.

10. The receptacle connector as claimed in claim 8, wherein the metallic shell comprises a front region which defines the mating cavity, a middle region retained on the base in a vertical direction and a transverse direction and a rear region retained on the base in a front to back direction.

11. The receptacle connector as claimed in claim 10, wherein the front region defines a pair of front mounting legs and the rear region defines a pair of rear mounting legs.

12. The receptacle connector as claimed in claim 11, wherein each of the mounting legs defines a standoff region intended to stand on the printed circuit board.