Abstract:
A method of making a receptacle connector includes: Step 1: providing an upper terminal module making via a first inserting molded process; Step 2: providing an lower terminal module making via another first inserting molded process; Step 3: stacking the upper and lower terminal modules together in a vertical direction so as to provide a main basis; Step 4: applied an insulative filler on the main basis via a second insert molding process, wherein the insulative filler fills and completes the front tongues of the upper and lower terminal module thereby forming a mating tongue for inserting a plug connector.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a continuation of the co-pending application Ser. No. 14/688,993 filed Apr. 16, 2015, which is a continuation-in-part of the co-pending application Ser. No. 14/497,205 filed Sep. 25, 2014 and Ser. No. 14/558,732 filed Dec. 3, 2014 and further claims the benefit of, and priority to, U.S. Provisional Patent Application No. 61/981,217, filed Apr. 18, 2014, Ser. No. 61/989,508, filed May 6, 2014 and Ser. No. 62/001,084 filed May 21, 2014, the contents of which are incorporated entirely herein by reference. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to an electrical connector, and more particularly to a flippable plug connector used with a receptacle connector. 
         [0004]    2. Description of Related Art 
         [0005]    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, a proposal for use with the future USB (Universal Serial Bus) was presented. 
         [0006]    Hence, a new and simple electrical plug connector and the complementary receptacle connector are desired to improve those disclosed in the aforementioned proposal. 
       SUMMARY OF THE INVENTION 
       [0007]    Accordingly, the object of the present invention is to a method of making a receptacle connector comprises: providing an upper terminal module comprising an upper insulator and a row of upper contacts inserting molded in the upper insulator, wherein the upper insulator comprises a rear base and a front tongue extending forward from the rear base, the upper contacts comprises contacting sections disposed in the front tongue and leg sections extending out of the rear base; providing a lower terminal module comprising a lower insulator and a row of lower contacts inserting molded in the lower insulator, wherein the lower insulator comprises a rear base and a front tongue extending forward from the rear base, the lower contacts comprises contacting sections disposed in the front tongue and leg sections extending out of the rear base; stacking the upper and lower terminal modules together in a vertical direction so as to provide a main basis; applied an insulative filler on the main basis via an insert molding process, wherein the insulative filler fills and completes the front tongues of the upper and lower terminal module thereby forming a mating tongue for inserting a plug connector. 
         [0008]    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 
         [0009]      FIG. 1  is an assembled perspective view of a mated receptacle connector on a printed circuit board and a plug connector of a first embodiment of the instant invention. 
           [0010]      FIG. 2  is a front perspective view of the receptacle connector spaced from the printed circuit board of  FIG. 1 . 
           [0011]      FIG. 3  is a front partially exploded perspective view of the receptacle connector of  FIG. 2 . 
           [0012]      FIG. 4  is a front partially exploded perspective view of the receptacle connector of  FIG. 2  without the shield thereof. 
           [0013]      FIG. 5  is a front partially exploded perspective view of the receptacle connector of  FIG. 4  to show the housing and the contacts thereof. 
           [0014]      FIG. 6  is a rear partially exploded perspective view of the receptacle connector of  FIG. 2  wherein the housing and the contacts are pre-assembled together. 
           [0015]      FIG. 7  is a cross-sectional view of the receptacle connector on the printed circuit board of  FIG. 2  to show the retention tang of the shield. 
           [0016]      FIG. 7(A)  is a cross-sectional view of the receptacle connector to show the extending plate of the collar. 
           [0017]      FIG. 8  is a cross-sectional view of the mated plug connector and receptacle connector taken along lines  8 - 8  of  FIG. 1  to show how the latch of the plug connector is lockable engaged with the shielding plate of the receptacle connector. 
           [0018]      FIG. 9  is a front assembled perspective view of a second embodiment of the receptacle connector mounted to the printed circuit board. 
           [0019]      FIG. 10(A)  is a front partially exploded downward perspective view of the receptacle connector mounted upon the printed circuit board of  FIG. 9 . 
           [0020]      FIG. 10(B)  is a rear partially exploded upward perspective view of the receptacle connector of  FIG. 9 . 
           [0021]      FIG. 11(A)  is a further front partially exploded downward perspective view of the receptacle connector of  FIG. 10(A) . 
           [0022]      FIG. 11(B)  is a further front partially exploded upward perspective view of the receptacle connector of  FIG. 10(B) . 
           [0023]      FIG. 12(A)  is a front exploded downward perspective view of the portion of the terminal module of the receptacle connector of  FIG. 11(A)  before the second molding process. 
           [0024]      FIG. 12(B)  is a rear exploded upward perspective view of the portion of the terminal module of the receptacle connector of  FIG. 11(B)  before the second molding process. 
           [0025]      FIG. 13(A)  is a front exploded downward perspective view of the portion of the terminal module of the receptacle connector of  FIG. 11(A)  wherein the housing and the contacts are pre-assembled together before the second molding process. 
           [0026]      FIG. 13(B)  is a further rear exploded upward perspective view of the portion of the terminal module of the receptacle connector of  FIG. 11(B)  wherein the housing and the contacts are pre-assembled together before the second molding process. 
           [0027]      FIG. 14  is a front assembled perspective view of the portion of the terminal module of the receptacle connector of  FIG. 13(A) . 
           [0028]      FIG. 15  is a further front assembled perspective view of the portion of the terminal module of the receptacle connector of  FIG. 14 . 
           [0029]      FIG. 16(A)  is a further front assembled perspective view of a portion of the terminal module of the receptacle connector of  FIG. 15  before the second molding process. 
           [0030]      FIG. 16(B)  is a rear assembled perspective view of the portion of the terminal module of the receptacle connector of  FIG. 15  before the second insert molding process. 
           [0031]      FIG. 17  is a front assembled perspective view of the terminal module of the receptacle connector of  FIG. 16(A)  after the second insert molding process. 
           [0032]      FIG. 17(A)  is a front assembled perspective view of another embodiment of the terminal module of the receptacle connector of  FIG. 16 . 
           [0033]      FIG. 18(A)  is a front perspective view of the portion of the terminal module of the receptacle connector of  FIG. 16(A)  to show the structures thereof wherein a front section is removed to expose the corresponding grooves therein. 
           [0034]      FIG. 18(B)  is a front perspective view of the portion of the terminal module of the receptacle connector of  FIG. 17  to show the corresponding grooves are filled with the insulative material after the second molding process. 
           [0035]      FIG. 19(A)  is a side cross-sectional view of the receptacle connector of  FIG. 9 . 
           [0036]      FIG. 19(B)  is a side cross-sectional view of the receptacle connector of  FIG. 9 . 
           [0037]      FIG. 20  is a front assembled perspective view of a third embodiment of the receptacle connector mounted upon the printed circuit board according to the invention. 
           [0038]      FIG. 21  is a front exploded perspective view of the receptacle connector taken away from the printed circuit board of  FIG. 20 . 
           [0039]      FIG. 22(A)  is a further front exploded perspective view of the receptacle connector of  FIG. 21  after the second insert molding process. 
           [0040]      FIG. 22(B)  is a further rear exploded perspective view of the receptacle connector of  FIG. 21  after the second insert molding process. 
           [0041]      FIG. 23  is a further front exploded perspective view of the receptacle connector of  FIG. 21  after the first insert molding process. 
           [0042]      FIG. 24  is a further front exploded perspective view of the terminal module of the receptacle connector of  FIG. 23  after the first insert molding process. 
           [0043]      FIG. 25(A)  is further front exploded perspective view of the terminal module of the receptacle connector of  FIG. 24  after the first insert molding process. 
           [0044]      FIG. 25(B)  is a further rear exploded perspective view of the terminal module of the receptacle connector of  FIG. 24  after the first insert molding process. 
           [0045]      FIG. 26(A)  is a further front exploded perspective view of the terminal module of the receptacle connector of  FIG. 25(A) . 
           [0046]      FIG. 26(B)  is a further rear exploded perspective view of the terminal module of the receptacle connector of  FIG. 25(A) . 
           [0047]      FIG. 27  is a cross-sectional view of the receptacle connector mounted upon the printed circuit board of  FIG. 20 . 
           [0048]      FIG. 28  is a top view of the contacts of the receptacle connector of  FIG. 20  to show width variation of the contacts. 
           [0049]      FIG. 29  is a top view of the terminal module of the receptacle connector of  FIG. 20 . 
           [0050]      FIG. 30  is an assembled perspective view of a fourth embodiment of the receptacle connector mounted upon the printed circuit board according to the invention. 
           [0051]      FIG. 31  is a rear exploded view of the receptacle connector taken away from the printed circuit board of  FIG. 30 . 
           [0052]      FIG. 32(A)  is a further front exploded view of the receptacle connector of  FIG. 30 . 
           [0053]      FIG. 32(B)  is a further rear exploded view of the receptacle connector of  FIG. 31 . 
           [0054]      FIG. 33(A)  is a further front exploded view of the receptacle connector of  FIG. 32(A) . 
           [0055]      FIG. 33(B)  is a further rear exploded view of the receptacle connector of  FIG. 32(B) . 
           [0056]      FIG. 34  is a further rear exploded view of the receptacle connector of  FIG. 33(B) . 
           [0057]      FIG. 35(A)  is a further front exploded view of the terminal module of the receptacle connector of  FIG. 34 . 
           [0058]      FIG. 35(B)  is a further rear exploded view of the terminal module of the receptacle connector of  FIG. 34 . 
           [0059]      FIG. 36(A)  is a further front exploded view of the terminal module of the receptacle connector of  FIG. 35(A) . 
           [0060]      FIG. 36(B)  is a further rear exploded view of the terminal module of the receptacle connector  FIG. 35(B) . 
           [0061]      FIG. 37  is a cross-sectional view of the receptacle connector mounted upon the printed circuit board of  FIG. 40 . 
           [0062]      FIG. 38  is a front assembled perspective view of a fifth embodiment of the receptacle connector mounted to the printed circuit board. 
           [0063]      FIG. 39  is a front exploded perspective view of the receptacle connector moved away from the printed circuit board of  FIG. 38 . 
           [0064]      FIG. 40  is a rear partially exploded perspective view of the receptacle connector of  FIG. 38 . 
           [0065]      FIG. 41  is a further front partially exploded perspective view of the receptacle connector of  FIG. 38  after the second insert molding process. 
           [0066]      FIG. 42  is a further front partially exploded perspective view of the receptacle connector of  FIG. 41  after the first insert molding process. 
           [0067]      FIG. 43  is a front exploded perspective view of the terminal module of the receptacle connector of  FIG. 42  after the first insert molding process. 
           [0068]      FIG. 44(A)  is a further front exploded perspective view of the terminal module of the receptacle connector of  FIG. 43  after the first insert molding process. 
           [0069]      FIG. 44(B)  is a further rear exploded perspective view of the terminal module of the receptacle connector of  FIG. 43  after the first insert molding process. 
           [0070]      FIG. 45  is a cross-sectional view of the receptacle connector on the printed circuit board of  FIG. 38 . 
           [0071]      FIG. 46  is a cut-out, i.e., one half, front assembled perspective view of the receptacle connector mounted upon the printed circuit board according to a six embodiment of the invention. 
           [0072]      FIG. 47(A)  is a front exploded downward perspective view of the receptacle connector of  FIG. 46 . 
           [0073]      FIG. 47(B)  is a rear exploded upward perspective view of the receptacle connector of  FIG. 46 . 
           [0074]      FIG. 48  is a rear further exploded upward perspective view of the receptacle connector of  FIG. 47(B) . 
           [0075]      FIG. 49  is a front further exploded downward perspective view of the receptacle connector of  FIG. 47(A) . 
           [0076]      FIG. 50  is a partial perspective view of the receptacle connector of  FIG. 46  to show the tip of the contacting section is pressed by the housing. 
           [0077]      FIG. 51  is a perspective view of the shielding plate of the receptacle connector of  FIG. 46  to show with the openings for insert molding. 
           [0078]      FIG. 52  is a perspective view of the collar of the receptacle connector of  FIG. 46  to show a slot formed therein. 
           [0079]      FIG. 53  is a perspective view of a seventh embodiment of a combo receptacle connector mounted upon a printed circuit board according to the invention. 
           [0080]      FIG. 54  is a front view of the combo receptacle connector on the printed circuit board of  FIG. 53 . 
           [0081]      FIG. 55  is a top view of the combo receptacle connector on the printed circuit board of  FIG. 53  wherein the shield is shown in a transparent way to expose the inner contact arrangement. 
           [0082]      FIG. 56(A)  is a perspective view of the full featured cable connector for use with the combo receptacle connector of  FIG. 53 . 
           [0083]      FIG. 56(B)  is a perspective view of the flippable power cable connector for use with the combo receptacle connector of  FIG. 53 . 
           [0084]      FIG. 56(C)  is a perspective view of the flippable Type C cable connector for use with the combo receptacle connector of  FIG. 53 . 
           [0085]      FIG. 57(A)  is a perspective view of the cable connector of  FIG. 56(A)  used with the combo receptacle connector of  FIG. 53 . 
           [0086]      FIG. 57(B)  is a perspective view of the cable connectors of  FIGS. 56(B) &amp; 56(C)  simultaneously used with the combo receptacle connector of  FIG. 53 . 
           [0087]      FIG. 58(A)  is a chart showing the pin assignment of the power port of the combo receptacle connector of  FIG. 53 . 
           [0088]      FIG. 58(B)  is a chart showing the pin assignment of the micro DisplyPort port of the combo receptacle connector of  FIG. 53 . 
           [0089]      FIG. 58(C)  is a chart showing the pin assignment of the Type C port of the combo receptacle connector of  FIG. 53 . 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0090]    Reference will now be made in detail to the preferred embodiment of the present invention. 
         [0091]      FIGS. 1-8  show a plug connector  10  mated with a receptacle connector  50  mounted in a notch  102  of a printed circuit board.  100 , of a first embodiment of this present invention. The receptacle connector  50  includes an insulative housing  52  with a mating tongue  54  forwardly extending in a capsular mating cavity  57  of a metallic shield  56  which encloses the housing  52 . Opposite upper and lower rows of contacts  58  are disposed in the housing  52  with corresponding contacting sections  60  exposed upon opposite surfaces of the mating tongue  54  in a diagonally symmetrical arrangement mechanically and electrically so as to allow a so-called flappable insertion of the plug connector  10  thereinto. A step structure  62  is formed around a root of the mating tongue  54 . A one piece metallic EMI collar  64  includes a loop structure  66  intimately surrounding the step structure  62 . The collar  64  further includes an L-shaped extending plate  65  equipped with embossments  63  thereon and received in the recess  61  of the lower piece  72  of the housing  52  (illustrated later) for mechanically and electrically connecting to the shield  56 . The detailed structures of EMI collar  64  may be also referred to the embodiment disclosed in  FIG. 15 . 
         [0092]    The housing  52  is composed of the upper piece  70  and a lower piece  72  commonly sandwiching therebetween a middle piece  74  which forms the mating tongue  54 . The upper row contacts  58  are associated with the upper piece  70 , the lower row contacts  58  are associated with a lower piece  72  and the shielding plate  76  is associated with the middle piece  74  via an insert molding process wherein the contacting sections  60  of the upper row contacts  58  and those of the lower rows contacts  58  are seated upon opposite upper surface and lower surface of the mating tongue  54 , respectively, as mentioned before. Understandably, the housing  52  and the associated contacts  58  may be deemed wholly as a so-called terminal module implying the terminals being integrally formed within an insulator. A rear portion of the step structure  62  is removed to have a front edge region  71  of the upper piece  70  and the front edge region  73  of the lower piece  72  sandwiched between the middle piece  74  and the loop structure  66  of the EMI collar  64  so as to enhance the strength during mating under some bending. In this embodiment, the shielding plate  76  defines an opening  77  and a thinner area  78  for both securing and impedance consideration, and further a pair of mounting legs  79  so as to efficiently separate the upper row contacts  58  and the lower row contacts  58  from each other wherein the upper row contacts  58  form the surface mount type tail sections while the lower row contacts  58  form the through hole type tail sections. In an alternate embodiment, the thinner area  78  may be totally removed from the shielding plate  76 . The lower piece  72  includes a pair of mounting posts  80  receiving in the corresponding through hole for mounting the housing  52  to the printed circuit board  100 . The lower piece  72  further forms a pair of recessions  49  to receive the corresponding retention tangs  37  of the shield  56 . 
         [0093]    In this embodiment, the middle piece  74  forms a pair of recesses  82  to respectively receive the corresponding protrusions  84  of the upper piece  70  and the lower piece  72  for securing the upper piece  70 , the lower piece  72  and the middle piece  74  therebetween in a stacked manner wherein the upper piece  70  further include a pair of downward assembling poles  84  received in the corresponding alignment holes  86  of the middle piece  74 , and the lower piece  72  further includes an upward assembling pole  85  received in the corresponding alignment holes  86  of the middle piece  74 , and the lower piece  72  further forms a pair of upward locating posts  87  received within the corresponding recesses  89  in the upper piece  70 . In this embodiment, the lower piece  72  defines a plurality of through holes  91  and  93  to receive the tail sections of the lower row contacts  58  and the mounting legs  79  of the shielding plate  76  to extend therethrough as an alignment spacer. Notably, the shielding plate  76  forms a front edge section  69  extending forwardly beyond a front edge of the mating tongue  54  for anti-mismsting consideration, and a pair of lateral edge sections  67  for locking with a latch  39  of the plug connector  10  (illustrated later). In brief, the shielding plate  76  is essentially multifunctional to perform shielding, grounding, reinforcing, anti-mis-mating and locking. A metallic bracket  95  is soldered under the shield  56  and forms a pair of supporting legs  97  mounted into the through hole  103  of the printed circuit board  100  for supporting the receptacle connector  50  within the notch  102  of the printed circuit board  100 . The shield  56  further includes an upside-down U-shaped structure (not labeled) on a rear portion covering the rear portion of the housing  52  with a pair of mounting legs  55  received in the through holes  104  for mounting to the printed circuit board  100  and a pair of locking tabs  59  received in the recesses  99  of the upper piece  70  after the shield  56  is rearwardly assembled to the housing  52  in a front-to-back direction. Notably, the mounting leg  79  of the shielding plate  76  share the same through hole with the neighboring grounding contact tail for enhancing grounding effect. 
         [0094]    Referring to  FIGS. 9-19 (B), according to a second embodiment of the invention the receptacle connector  200  includes a terminal module  220  enclosed in the metallic shield  210 , the terminal module  220  includes a vertical base  2205 , a horizontal base  2206  and a mating tongue  294  extends forwards from the vertical base  2205 . The terminal module  220  essentially includes a main basis  230  as a semi-finished part, and a filler  260  applied upon and filled within the main basis  230  via second insert molding process. The main basis  230  includes an upper part  232  and a lower part  242  commonly sandwiching a shielding plate  256  therebetween. The upper part  232  includes a plurality of upper contacts  234  embedded within an upper insulator  236  via a first insert molding process with the contacting sections  233  exposed upon an upper surface of the upper insulator  236 , the tail sections  237  exposed behind the upper insulator  236 , and retention protrusions  235  located between the contacting sections  233  and the tail sections  247  in the front-to-back direction and embedded within the upper insulator  236 . Notably, the upper insulator  236  essentially forms a Z-shaped structure in a side view with an additional rear wall and further defines a plurality of grooves  238  extending along the front-to-back direction while hidden under the upper surface of the upper insulator  236 , and a plurality of through holes  240  in the vertical direction and in communication with the corresponding grooves  238 , respectively. The through holes  240  are formed for receiving mold cores which are used to press against contacts carries during the first inserted mold process and then the contact carriers are cut to separate the contacts by cutting-tools going through the through holes  240 . Furthermore, the reason why the through holes  240  communicate with the corresponding grooves  238  respectively, is for the second insert molding process illustrated later. A pair of protrusions  241  is formed on two opposite lateral sides of the upper insulator  236  for the second insert molding process. The upper insulator  236  is further equipped with a downward protrusion  239  and a recession  231  for coupling to the counterparts of the lower part  242  during assembling to the final main basis  230 . Understandably, as shown in  FIG. 18(A) and 18(B) , the upper insulator  236  forms a zigzag structure in a cross-sectional view to receive the corresponding contacting sections  233  and to form the corresponding grooves  238  so that the contacting sections  233  and the grooves  238  are not aligned with in the vertical direction but being laterally offset from each other. Furthermore, a transverse groove  280  is formed in the upper insulator  236  to intersect with the plurality of grooves  238  and under the upper surface of the upper insulator  236  for integration/reinforcement consideration during the second insert molding process. It is noted that the upper insulator  236  is terminated behind the corresponding tips  2331  of the contacting sections  233  so as to expose only the corresponding tips of the contacting sections  233  compared with the full contacting sections of the first embodiment as shown in  FIG. 6 . 
         [0095]    The arrangement of the lower part  242  are similar to that of the upper part  232  only with some minor differences. The lower part  242  includes a plurality of lower contacts  244  embedded with a lower insulator  246  via another first insert molding process with the lower contacting sections  243  exposed upon a lower surface of the lower insulator  246 , the lower tail sections  247  exposed behind the lower insulator  246 , and the retention protrusions  245  located between the contacting sections  243  and the tail sections  247  in the front-to-back direction and embedded within the lower insulator  246 . Notably, the lower insulator  246  forms a Z-shaped structure in a side view and defines a plurality of grooves  248  extending along the front-to-back direction and hidden above the bottom surface of the lower insulator  242 , and a plurality of through holes  250  communicating with the corresponding grooves  248  in the vertical direction, respectively. A pair of protrusions  251  are formed on two opposite lateral sides of the lower insulator  246  for the second insert molding process. The lower insulator  246  is further equipped with an upward protrusion  249  and a recession  261  for coupling to the corresponding recession  231  and the downward protrusion  239  of the upper part  232  during assembling to the final main basis  230 . Understandably, as shown in  FIG. 18(A) and 18(B) , the lower insulator  246  forms a zigzag structure in a cross-sectional view to receive the corresponding contacting sections  243  and to form the corresponding grooves  248  so that the contacting sections  243  and the grooves  248  are not aligned with in the vertical direction but being laterally offset from each other. Furthermore, a transverse groove  282  is formed in the upper insulator  246  to intersect with the plurality of grooves  248  and under the lower surface of the upper insulator  246  for integration/reinforcement consideration during the second insert molding process. It is noted that the lower insulator  246  is terminated behind the corresponding tip sections of the contacting sections  243  so as to expose only the corresponding tip sections  2431  of the contacting sections  243  compared with the full contacting sections of the first embodiment as shown in  FIG. 6 . A pair of downwardly extending mounting posts  283  are located on a rear side of the lower insulator  246 . 
         [0096]    The shielding plate  256  forms a pair of locking side edges  258  for locking with the corresponding latches of the corresponding plug connector as shown in the first embodiment, and a central large through opening  257  and a pair of small through openings  259  in a front portion for allowing the fillers  260  to occupy therein during the second insert molding process. A pair of legs  255  are formed on a rear portion of the shielding plate  256 , a pair of notches  253  are formed in a side-projecting portion  2561  of each lateral side of the shielding plate  256 , and a large cutout  254  is formed in a front portion of the shielding plate  256 . A pair of metallic collars  290  are respectively mounted upon the upper insulator  236  and the lower insulator  246 , respectively. Each of collars  290  includes a pair of retention lugs  292  respectively located on two opposite lateral sides and embedded in the insulative housing. 
         [0097]    During assembling the main basis  230 , the upper part  232  and the lower part  242  are assembled with each other along the vertical direction with the shielding plate  256  sandwiched therebetween in the vertical direction wherein the protrusions  239  and  249  extend through the central opening  247  to be received within the corresponding recessions  261  and  231 , and the retention lugs  292  are received in the corresponding notches  253   
         [0098]    The retention lug  290  at each end of the collar  290  includes a first lug  2921  with a half-circle notch  2923  at each free end of the first lug and a second lug  2922 . The upper collar  290   a  and the lower collar  290   b  are sidewardly assembly to a root of the tongue portions  2911  of the assembled upper and lower parts. The first and second lugs of the upper and lower collars are received in the corresponding notches  253 , the first and second lugs in the same notch  253  are aligned with each other and spaced from each other with a gap  2924  which will be fully filled with the filler  260 . The protrusions  241 ,  251  are located between the retention lugs. 
         [0099]    The filler  260  is applied upon and into the main basis  230  to form the complete terminal module  220  via the second insert molding process. The filler  260  fills the grooves  238 ,  248 , the through openings  240 ,  250 , the transverse grooves  280 ,  282 , the central opening  257 , the pair of openings  259 , the large cutout  254 , and also covers two opposite lateral side portions and the front side portion of the main basis  230  while exposing the pair locking side edges  258 .  FIG. 17(A)  shows another embodiment similar to the first embodiment where the lateral sides  252  of the shielding plate  256  are fully exposed to an exterior along the forwardly extending mating tongue  294  of which the contacting sections  233 ,  243  are exposed on two opposite surfaces. The collars  290  are exposed to an exterior for mating with the spring plates of the corresponding plug connector. 
         [0100]    Notably, the line  295  is a boundary line between the filler  260  and the upper insulator  236  wherein the filler  260  share the same upper surface with the upper insulator  236  and the same lower surface with the lower insulator  246  on the mating tongue  294 . Clearly, the tip sections  2331  of the contacting sections  233  are retained by the filler  260  via the second insert molding process while the remaining portions of the contacting sections are retained by the upper insulator  236  via the first insert molding process. So are the contacting sections  243 . Referring to  FIGS. 19(A) and 19(B) , the front tip section  2331  of the contacting section  233  and the front tip section  2431  of the contacting section  243  are embedded within the filler  260 , which is different from that in the first embodiment as shown in  FIG. 7  with better retention performance On the other hand, because the filler  260  fills everywhere of the main basis  230  in three dimensions internally and/or externally under the second insert molding process, the whole terminal module  220  is efficiently consolidated including the front mating tongue  294 , the area around the collars  290  and the rear main body behind the collars  290 . Therefore, the so-call two-shot or double insert moldings method, i.e., the initial one for forming each of upper part  232  and lower part  242  and the successive one for integrating the terminal module  220 , used in this embodiment achieves the strong structure than the assembling type. As indicated before, an advantage of this embodiment is to prevent the tip of the contacting sections of the contacts from pop-up due to retention of the filler  260 . It is also noted that because only the very short tip section of the contacting section  233 / 243  is exposed outside of the upper/lower insulators  236 / 246  after the first insert molding process, such tip section of the contacting section is not subject to tilting during the second insert molding process. Understandably, if the boundary line  295  is far away from the tip of the contacting section  233 / 243 , the front section of the contacting section  233 / 243  is subject to tilting during the second insert molding process due to the high molding pressure disadvantageously. Same to the collars  290 , the collars  290  especially two opposite ends thereof are embedded in the step portion formed by the fillers  260 , only exposing upper and lower plates  2941  of collars  290  to the mating surfaces of the mating tongue. The upper and lower plates are flushed with the step portions of the filler  260 . As shown in  FIG. 10(A) , the filler  260  surrounding the upper and lower parts form the mating tongue  294  and the vertical base  2205 , while the horizontal base  2206  are exposed to an external without any filler  260  for lower cost. As shown in  FIG. 11(A) , the filler  260  includes a front bridge  2601  which surrounding front edges of the tongues of the insulators as best shown in  FIG. 19(A) , and other tongue portion  2602  and a base portion  2603  surrounding corresponding tongues and base of the insulator. As best shown in  FIG. 19(B)  and  FIG. 10(A) , the step portion  2201  at a root of the mating tongue has a front portion  2201   a  located in front of the collars  290  to resist the collars and the front portion  2201   a  has a front tilt face  2201   b  and a horizontal face  2201   c  flushed with the collars. The mating tongue defines two opposite mating surfaces at an upper and a lower surface thereof. A rear edge  2111  of the shielding  210  is retained around the vertical base  2205 . Similar to the first embodiment, after assembled the mating tongue  294  extends in the capsular mating cavity  211  defined in the shield  210  for allowing the corresponding plug connector to be inserted therein in a flippable manner, i.e., concerning no orientations. Similar to the first embodiment, the lower insulator  246  has a pair of alignment posts  284  respectively received within the corresponding recesses  286  of the upper insulator  236  so as to guide vertical assembling between the upper insulator  236  and the lower insulator  246  in the vertical direction to sandwich shielding plate  256  therebetween as mentioned before. 
         [0101]      FIGS. 20-29  show a third embodiment similar to a second embodiment wherein the receptacle connector  300  mounted upon the printed circuit board  103  includes a terminal module  320  enclosed in the metallic shield  310  which is soldered to a metallic bracket  312 . The terminal module  320  essentially includes a main basis  330  as a semi-finished part, and a filler  360  applied upon and filled within the main basis  330  via a second insert molding process. The main basis  330  includes an upper part  332  and a lower part  342  commonly sandwiching a shielding plate  356  therebetween. The upper part  332  includes a plurality of upper contacts  334  embedded within an upper insulator  336  via a first insert molding process with the contacting sections  333  exposed upon an upper surface of the upper insulator  336 , the tail sections  337  exposed behind the upper insulator  336 , and retention protrusions  335  located between the contacting sections  333  and the tail sections  337  in the front-to-back direction and embedded within the filler  360  after the second insert molding process. Notably, the upper insulator  336  essentially forms a Z-shaped structure in a side view with an additional rear wall and further defines a plurality of grooves  338  extending along the front-to-back direction while hidden under the upper surface of the upper insulator  336 , a plurality of grooves  381  extending along the front-to-back direction and exposed upon the upper surface of the upper insulator  336 , and a plurality of through holes  340  in the vertical direction and in communication with the corresponding grooves  338 , respectively. It is noted that the grooves  338  and the grooves  381  and the through holes  340  are used for having the core pins therein during the first insert molding process to retain/sandwich the contacting sections  333  of the corresponding contacts  334  in the transverse direction. Another set of through holes  385  are formed in the upper insulator  336  right under the contacting sections  333  of the corresponding contacts  334  for receiving the molding core pins during the first insert molding process to support the contacting sections  333  in the vertical direction. Anyhow, those grooves  338 ,  381  and the through holes  340 ,  385  will be filled with the filler  360  during the second insert molding process. The upper insulator  336  is further equipped with two downward protrusion  339 ,  339 ′ and two recession  331 ,  331 ′ for coupling to the counterparts of the lower part  342  during assembling to the final main basis  330 . Furthermore, a transverse groove  380  is formed in the upper insulator  336  to intersect with the plurality of grooves  381  and under the upper surface of the upper insulator  336  for integration/reinforcement consideration during the second insert molding process. It is noted that compared with the similar second embodiment described in the previously filed application Ser. No. 61/989,508 which implements the two insert molding processes while still leaving shortened tips of the corresponding contacting sections at the front, in this embodiment the upper insulator  336  fully covers the front tips of the contacting sections  333  of the corresponding contacts  334 , thus avoiding the possible tilting of the front tips of the contacting sections of the corresponding contact during the second insert molding process. The upper insulator  336  further forms a pair of notches  395  in two opposite lateral sides. It should be noted that using the two-insert-molding process or the so-called two-shot process to form a complete tongue like part is essentially not novel, referring to the copending application Ser. No. 14/531,978 having the same assignee thereof. 
         [0102]    The arrangement of the lower part  342  are similar to that of the upper part  332  only with some minor differences. The lower part  342  includes a plurality of lower contacts  344  embedded with a lower insulator  346  via another first insert molding process with the lower contacting sections  343  exposed upon a lower surface of the lower insulator  346 , the lower tail sections  347  exposed behind the lower insulator  346 , and the retention protrusions  345  located between the contacting sections  343  and the tail sections  347  in the front-to-back direction and embedded within the filler  360  after the second insert molding process. Notably, the lower insulator  346  forms a Z-shaped structure in a side view and defines a plurality of grooves  348  extending along the front-to-back direction and hidden above the bottom surface of the lower insulator  342 , a plurality of grooves  383  extending along the front-to-back direction and a plurality of through holes  350  communicating with the corresponding grooves  348  in the vertical direction, respectively. Another set of through holes  387  are formed in the lower insulator  346  right above the contacting sections  343  of the corresponding contacts  344  for receiving the molding core pins during the first insert molding process to support the contacting sections  343  in the vertical direction. The filler  360  fills the grooves  348 ,  383  and the through holes  350 ,  387  during the second insert molding process. The lower insulator  346  is further equipped with upward protrusions  349 ,  349 ′ and recessions  361 ,  361  for coupling to the corresponding recessions  331 ,  331 ′ and the downward protrusions  339 ,  339 ′ of the upper part  332  during assembling to the final main basis  330 . Furthermore, a transverse groove  382  is formed in the lower insulator  346  to intersect with the plurality of grooves  383  and above the lower surface of the lower insulator  346  for integration/reinforcement consideration during the second insert molding process. It is noted that the lower insulator  346  fully covers the contacting sections  343  of the contacts  344  and formed a pair of legs  397 . 
         [0103]    The shielding plate  356  forms a pair of locking side edges  358  for locking with the corresponding latches of the corresponding plug connector as shown in the first embodiment, and two pairs of large through opening  357  for extension of the corresponding protrusions  349 .  349 ′ and  339 ,  339 ′, and a pair of small through openings  359  in a front portion for allowing the fillers  360  to occupy therein during the second insert molding process. A pair of legs  355  are formed on a rear portion of the shielding plate  356 , a pair of notches  353  are formed in each lateral side of the shielding plate  356 , and a large cutout  354  is formed in a front portion of the shielding plate  356 . A pair of metallic collars  390  are respectively mounted upon the upper insulator  336  and the lower insulator  346 , respectively. Each of collars  390  includes a pair of retention lugs  392  respectively located on two opposite lateral sides, and an extension  394  in the vertical direction to mechanically and electrically connect the shield  310 . 
         [0104]    During assembling the main basis  330 , the upper part  332  and the lower part  342  are assembled with each other along the vertical direction with the shielding plate  356  sandwiched therebetween in the vertical direction and also in the front-to-back direction wherein the protrusions  339 ,  339 ′ and  349 ,  349 ′ extend through the central opening  347  to be received within the corresponding recessions  361 ,  361 ′ and  331 ,  331 ′, the legs  297  are received in the corresponding notches  395 , and the retention lugs  392  are received in the corresponding notches  353 . 
         [0105]    The filler  360  is applied upon and into the main basis  330  to form the complete terminal module  320  via the second insert molding process. The filler  360  fills the grooves  338 ,  348 , the through openings  340 ,  350 , the transverse grooves  380 ,  382 , the pair of openings  359 , the large cutout  354 , and also covers the vertical portions of both the upper part  332  and the lower part  342 , two opposite lateral side portions and the front side portion of the main basis  330  while exposing the pair locking side edges  358 . The collars  390  are exposed to an exterior for mating with the spring plates of the corresponding plug connector. The shield  310  encloses the terminal module  320  and soldered to the bracket  312 . The bracket  312  includes retention tabs  314  received in the corresponding recess of the upper insulator  336  for securing the terminal module  320  thereto, a plurality of mounting legs  316  for mounting into the though holes  1031  in the printed circuit board  103 , and a plurality of tabs  318  on the rear wall  317  electrically and mechanically connected to the corresponding pad. Notably, compared with the two previous embodiments, in this embodiment the shield  310  only has the front capsular section without the rear raised rectangular section. Therefore, the corresponding bracket  312  is required to further form a rear raised section to shield the base of the housing. Anyhow, similar to what is disclosed in the provisional application 61/977,115, the bracket  312 , which as a front partially capsular section (not labeled) and the rear partially rectangular raised section (not labeled), is equipped with the lateral extension  315  ( FIG. 22(A) ) extending from the rear raised section to shield, in the front-to-back direction, the corresponding upper insulator which is originally exposed forwardly to the exterior. 
         [0106]    Because the filler  360  fills everywhere of the main basis  330  in three dimensions internally and/or externally under the second insert molding process, the whole terminal module  320  is efficiently consolidated including the front mating tongue  399 , the area around the collars  390  and the rear main body behind the collars  390 . Therefore, the so-call two-shot or double insert moldings method, i.e., the initial one for forming each of upper part  332  and lower part  342  and the successive one for integrating the terminal module  320 , used in this embodiment achieves the strong structure than the assembling type. An advantage of this embodiment is to prevent the tip of the contacting sections of the contacts from pop-up via the first molding process while having the through holes, which are used to receive core pins for holding/supporting the contacting sections of the contacts in position during the first insert molding process, filled with the filler  260  during the second insert molding process so as to assure the sufficient strength of the mating tongue. Similar to the first embodiment, after assembled the mating tongue  399  extends in the capsular mating cavity  311  defined in the shield  310  for allowing the corresponding plug connector to be inserted therein in a flippable manner, i.e., concerning no orientations. The rear wall  319  of the shield  310 , which cover the back side of the lower portion of the lower insulator  346  may efficiently prevent EMI which invades through the mating cavity  311 , from rearwardly entering an interior of the computer around the printed circuit board  103 . As shown in  FIG. 27 , the rear wall  319  of the shield  310  may shield EMI at or below the level of the printed circuit board  103  while the rear wall  317  of the bracket  312  may shield EMI above the printed circuit board  103  along the front-to-back direction. Thus, by cooperation of those two rear walls, the EMI may be efficiently prevented along the front-to-back direction. Notably, the lateral extension  315  covering the originally exposed corresponding portion of the housing, i.e., the upper insulator, also provides EMI prevention along the front-to-back direction. 
         [0107]      FIGS. 30-37  show a fourth embodiment similar to the previous embodiments wherein the receptacle connector  500  mounted upon and within a cutout  1041  of the printed circuit board  104 . The connector  500  includes a metallic shield  510  enclosing the terminal module  520  and attached/soldered to a metallic bracket  512  above which is mounted to the printed circuit board via mounting legs  516 . The shield  510  is equipped with the flared flange  514  in the front opening for easy insertion of the plug connector is made via the stamping from sheet metal with spring tangs  513  for engagement with the inserted plug connector. A rear wall  515  is unitarily formed with the shield  510  to prevent EMI invasion along the front-to-back direction around a lower half portion of the connector  500  wherein the rear wall  515  extends from a bottom wall  517  of the shield  510 , located behind the terminal module  520 , and terminates around an upper surface of the printed circuit board  104  as shown in  FIG. 37 . Similar to the previous embodiment, the bracket  512  is equipped with a rear wall  519  extending downward from a top wall (not labeled), located behind the terminal module  520 , and terminates at an upper surface of the printed circuit board  600 . Thus, by cooperation of both the rear wall  515  of the shield  510  and the rear wall  519  of the bracket  512 , no EMI through the connector  500  may invade an interior of the computer around the printed circuit board  600  in the front-to-back direction. Notably, in this embodiment, the rear wall  515  is unitarily formed with the shield  510 . 
         [0108]    Similar to the previous embodiment, the terminal module  520  includes a main basis  530  and a filler  560  assembled to each other via a second insert molding process. The main basis  530  includes an upper part  532  essentially consisting of a plurality of upper contacts  534  embedded within an upper insulator  536  via a first insert molding process, a lower part  542  essentially consisting of a plurality of lower contacts  544  embedded within a lower insulator  546  via a second insert molding process, and metallic shield plate  556  sandwiched between the upper part  532  and the lower part  542 . The man basis  530  and the filler  560  are very similar to those in the previous embodiment disclosed in  FIG. 20-29  except some tiny differences. For example, several ribs  537  are formed on the upper insulator  536  and an upstanding wall  547  is formed on the lower insulator  546  for interacting with the filler  560 . The collar  590  further forms a pair of through holes  592  in the vertical extension  594  for filling of the filler  560 . The filler  560  defines a contour in compliance with that of the shielding plate  556  so that the locking side edge  558  of the shielding plate  556  and the front edge of the shielding plate  556  no longer protrude out of the mating tongue  599  of the terminal module  530  in an exposed manner wherein the mating tongue  599  extends in the capsular mating cavity  511  in the shield  510 . Notably, the filler  560  may have less material than that disclosed in the previous embodiment due to the different contact carrier arrangement which may block some injection paths of the second insert molding process. The whole assembling process is similar to that in the previous embodiment by two insert molding processes wherein the rear wall  515  of the shield  510  and the rear wall  519  of the bracket  512  are bent to their final vertical positions after the terminal module  530  has been assembled into the shield  510 . Alternately, the bracket  512  may be formed with its final shape and soldered to the shield  510  after the terminal module  530  is assembled into the shield  510 . Understandably, in this embodiment, a metallic bottom bracket similar to that in the first embodiment while with an additional rear wall, may not be required because the shield  510  already provides. At the same time, the continuous flared flange  514  around the front opening of the shield  510 , which is required for mating and generally provided by the drawing method, is also constituted via stamping and forming sheet metal economically. In this embodiment, the boundary line  597  of the shield  510  is located on a top wall (not labeled) of the shield  510 , compared with that in the previous embodiment located on the bottom wall. Understandably, this reverse arrangement with regard to the previous embodiment may provide a complete/unitary structure of the rear wall advantageously without a slit/boundary line of the rear wall around the middle area which is shown in the previous embodiment. 
         [0109]    Referring to  FIGS. 38-45 , according to a fifth embodiment of the invention the receptacle connector  600  mounted upon the printed circuit board  106 , includes a terminal module  620  enclosed in the metallic shield  610  which is soldered to a metallic bracket  612 . The terminal module  620  essentially includes a main basis  630  as a semi-finished part, and a filler  660  applied upon and filled within the main basis  660  via a second insert molding process, which is similar to the previous embodiments. It is noted that compared with the similar second embodiment described in the previously filed application Ser. No. 61/989,508 which implements the two insert molding processes while still leaving shortened tips of the corresponding contacting sections at the front, in this embodiment the upper insulator  636  fully covers the front tips of the contacting sections  633  of the corresponding contacts  634 , the lower insulator  636  fully covers the front tips of the contacting sections  634  of the corresponding contacts  644 , thus avoiding the possible tilting of the front tips of the contacting sections of the corresponding contact during the second insert molding process. 
         [0110]    One important feature of the embodiment is to provide an EMI (Electro-Magnetic Interference) gasket  680  behind the lower insulator  646  and the filler  660  while in front of the printed circuit board  106  so as to be sandwiched between the electrical connector  600  and the printed circuit board  106 . The EMI gasket  680  is made of conductive elastomer consists of a silicone, fluorosilicone, EPDM or fluorocarbon-fluorosilicone binder with a filler of pure silver, silver-plated copper, silver-plated aluminum, silver-plated nickel, silver-plated glass, nickel-plated graphite, nickel-plated aluminum or unplated graphite particles. For those materials containing silver, both packaging and storage conditions should be similar to those for other silver-containing components, such as relays or switches. They should be stored in sheet plastic, such as polyester or polyethylene, and kept away from sulfur-containing materials, such as sulfur-cured neoprene, cardboard, etc. 
         [0111]    Because the filler  660  fills everywhere of the main basis  630  in three dimensions internally and/or externally under the second insert molding process, the whole terminal module  620  is efficiently consolidated including the front mating tongue  699 , the area around the collars  690  and the rear main body behind the collars  690 . Therefore, the so-call two-shot or double insert moldings method, i.e., the initial one for forming each of upper part and lower part and the successive one for integrating the terminal module  620 , used in this embodiment achieves the strong structure than the assembling type. An advantage of this embodiment is to prevent the tip of the contacting sections of the contacts from pop-up via the first molding process while having the through holes, which are used to receive core pins for holding/supporting the contacting sections of the contacts in position during the first insert molding process, filled with the filler  60  during the second insert molding process so as to assure the sufficient strength of the mating tongue. Similar to the first embodiment, after assembled the mating tongue  699  extends in the capsular mating cavity  611  defined in the shield  610  for allowing the corresponding plug connector to be inserted therein in a flippable manner, i.e., concerning no orientations. Different from the previous embodiment, the shield  610  of the receptacle connector  600  is equipped with the flared flanges  612  for easy mating with the plug connector. As mentioned before, the EMI gasket  680  may efficiently prevent EMI which invades through the mating cavity  611 , from rearwardly entering an interior of the computer around the printed circuit board  150 . Understandably, because the whole receptacle connector  600  is essentially fully enclosed within a space surrounded by the metallic shield  610 , the metallic bracket  612 , the EMI gasket  680 , and the printed circuit board  106 , there is less EMI concent Notably, the mounting posts of the lower insulator used for mounting to the printed circuit board in the first embodiment no longer exists in this embodiment for assuring no EMI leakage thereabouts. The surface mounting structure of the tail sections  637 ,  647  of both the contacts instead of the through hole type for mounting to the corresponding pads  1061  on the printed circuit board  106 , is another approach for achieving the EMI protection. One important feature of this embodiment is to provide a continuous flared flange structure  1061  on the shield  610  via a deep drawing process so as to not only ease insertion of the plug connector but also assure no leakage radially. Understandably, in this embodiment the shield  610  is made by a drawing process so no rear wall at the rear opening can be formed for blocking communication along the front-to-back direction. This is the reason why the additional EMI gasket is required. Differently, if the shield of the receptacle connector is made via stamping sheet metal with successive forming, the rear wall of the shield may be unitarily formed instead of the discrete EMI gasket. 
         [0112]      FIGS. 46-52  show a six embodiment of the receptacle connector  700  mounted upon the printed circuit board  107  according to a sixth embodiment wherein the metallic shield  710  includes the flared edges  712  for easy insertion of the corresponding plug connector. Notably,  FIGS. 46-49  do not show the complete detailed structure while only illustrating the primary portions related to the emphasized features; anyhow, the whole structures may be easily gotten via referring to the previous embodiments. The bracket  750  forms a recession  752  to receive deflection of the spring tang  714  during mating with the plug connector. The inner metallic collar  720  includes the rearwardly extending plate  722  with a notch, i.e., the retention plate  722  is split into two pieces  7221  each with a bump as shown in  FIG. 52 , to increase resiliency thereof. The upper piece  730  forms a laterally bulged portion  732  in front of the collar  720  to protect the contacting section  734  of the outmost contact. The lower piece  740  also forms the similar laterally bulged portion  742  in front of collar  720  to protect the contacting section of the outmost contact (not shown). The middle piece  760  forms a vertically expanded portion  762  so as to efficiently retain/align the upper piece  730 , the lower piece  740  and the middle piece  760  together, and a front stop  763  to stop the collar  760 . One half of the width of the front tip  7341  of the contacting section  734  of the upper contact is pressed by the middle piece  760  for retention as shown in  FIG. 50 . Same is to the lower contact. Understandably, to have the front tip of the contacting section of the contact pressed by the insulator requires a rotational assembling between the upper/lower piece  730 / 740  with regard to the middle piece  760 , instead of along the pure vertical direction. On the other hand, two lateral sides  7201  of the collar  720  may be inwardly crimped to secure to the middle piece  760  as shown in  FIG. 52  and. The shielding plate  758  has different openings  7581 ,  7582  to benefit flow of the insulative material during forming process. 
         [0113]      FIGS. 53-58 (C) show a seventh embodiment of the invention wherein a combo receptacle connector  900  is mounted upon a printed circuit board  980 . The combo receptacle connector  900 , in this embodiment, includes an unitary insulative housing defining first, second and third mating tongues  902 ,  904 ,  906  spaced from each other in a transverse direction with the contacting sections of the corresponding contacts thereon (not labeled), and a first metallic shield  910  encloses the first mating tongue  902  to define a first mating port categorized as the Type C port, while a second metallic shield  912  encloses both the second mating tongue  904  and the third mating tongue  906  to define the second mating port and the third mating port which are categorized as the Micro DisplayPort port and the power port transversely communicating with each other. The combo receptacle connector  900  can mated with the all featured cable connector  950  in one orientation for all three mating ports ( FIG. 57(A) ), or with the power cable connector  760  and the Type C cable connector  770  respectively while simultaneously in the corresponding ports in a flippable way ( FIG. 57(B) ), or with the Micro DisplayPort cable connector (not shown) only. Understandably, to achieve the flippable way, the two rows of contacts in both the receptacle connector  500  and the cable connectors  960 ,  970  are required to be in a diagonally symmetrical way as shown in the pin assignment charts of  FIGS. 58(A)-58(C) . Notably, the housing may be divided into two pieces by breaking the bridge section to separate the first mating port fully from the remaining second and third mating ports and to be mounted upon the printed circuit board  780  independently instead of simultaneously. On the other hand, the joined second and third mating ports are essentially of a D-shaped configuration which can be altered to other shapes, if necessary. 
         [0114]    However, the disclosure is illustrative only, changes may be made in detail, especially in matter of shape, size, and arrangement of parts within the principles of the invention.