Patent Publication Number: US-8992256-B2

Title: Electrical connector adapter

Description:
This application claims the priority benefit of Taiwan patent application number 102128346, filed on Aug. 7, 2013. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to electrical connectors, and more particularly to an electrical connector adapter, which an electrical insulating terminal holder having a front extension of reduced size extended from a holder body thereof, a conducting terminal set including conducting terminals suspending in the holder body, transmission terminals suspending in the front extension, and an EMI shielding shell surrounding the holder body and the front extension for enabling the electrical connector adapter to provide a wide range of applications. 
     2. Description of the Related Art 
     Following fast development of computer electronic technology, many high mobility electrical and electronic apparatus are well developed and widely used by people for different applications, bringing convenience to people and making people&#39;s life more comfortable. Further, high-speed, high-power and sophisticated mobile electrical and electronic devices and related products with large capacity and low profile characteristics have been continuously created. Further, many different transmission interfaces and connectors are widely used in electrical and electronic products for power and data transmission. For connecting different component parts, various transmission interfaces or connectors of different sizes and configurations must be used. Therefore, an electrical or electronic device needs to provide sufficient installation space for the installation of different types of transmission interfaces and connectors. 
     Further, it is the market trend to create mobility electronic apparatuses having light, thin, short and small characteristics. In consequence, circuit board electronic components must be made extremely strong, small and precise. Further, many different male and female electrical connectors are used in an electronic apparatus to connect different components and parts to a circuit board for the connection of mating electronic cards and/or connectors. These electrical connectors occupy much circuit layout space of the circuit board and the inside space of the electronic apparatus. It is quite important to fully utilize the circuit layout space of a circuit board and the internal space of an electronic apparatus. 
     SUMMARY OF THE INVENTION 
     The present invention has been accomplished under the circumstances in view. It is one object of the present invention to provide an electrical connector adapter, which requires less installation space and provides a wide range of applications. 
     To achieve this and other objects of the present invention, an electrical connector adapter in accordance with one embodiment of the present invention comprises an electrical insulating terminal holder, a conducting terminal set, and an EMI (electromagnetic interference) shielding shell. The electrical insulating terminal holder comprises a holder body defining a plurality of elongated openings and an abutment surface, a front extension forwardly extended from a lower part of the front side of the holder body, and an accommodation open space defined in the front extension. The front extension is configured relatively smaller than the holder body in width and height. The conducting terminal set is mounted in electrical insulating terminal holder, comprising a plurality of conducting terminals and a plurality of transmission terminals. Each conducting terminal comprises a mating contact end portion located at a front end thereof and suspending in one elongated opening, and a bonding end portion located at an opposite rear end thereof and extended out of the rear side of the holder body. Each transmission terminal comprises a mating contact end piece located at a front end thereof and suspending in the accommodation open space of the electrical insulating terminal holder, and a bonding end piece located at an opposite rear end thereof and extended out of the rear side of the holder body. The EMI shielding shell surrounds the electrical insulating terminal holder, comprising a main shell part, a main accommodation chamber defined in the main shell part and accommodating the holder body of the electrical insulating terminal holder, a first sub shell part forwardly extended from a front bottom side of the main shell part, and a first sub accommodation chamber defined in the first sub shell part and accommodating the front extension of the electrical insulating terminal holder. The first sub shell part is configured relatively smaller than the main shell part in width and height. 
     Further, the holder body of the electrically insulative terminal holder is configured to fit one of USB3.0, USB2.0 and HDMI specifications. Further, the front extension of the electrical insulating terminal holder is configured to fit one of Micro USB3.0, Micro USB2.0 and Mini HDMI specifications. 
     To achieve this and other objects of the present invention, an electrical connector adapter in accordance with another embodiment of the present invention comprises an electrical insulating terminal holder, a conducting terminal set, and an EMI (electromagnetic interference) shielding shell. The electrical insulating terminal holder comprises a holder body defining opposing front side and rear side, a plurality of elongated openings of different widths cut through opposing top and bottom walls of the holder body, an abutment surface disposed at a front side relative to the elongated openings, a front extension and a front tongue forwardly extended from the front side of the holder body, an accommodation open space defined in the front extension, and a plurality of terminal slots defined in the front tongue. The front extension and the front tongue are relatively smaller than the holder body in width and height. The conducting terminal set is mounted in the electrical insulating terminal holder, comprising a plurality of conducting terminals, a plurality of transmission terminals, a plurality of signal terminals, and a plurality of mating terminals. Each conducting terminal comprises a mating contact end portion located at a front end thereof and suspending in one elongated opening of the electrically insulating terminal holder, and a bonding end portion located at an opposite rear end thereof and extended out of the rear side of the holder body. Each transmission terminal comprises a mating contact end piece located at a front end thereof and supported on the abutment surface of the electrical insulating terminal holder, and a bonding end piece located at an opposite rear end thereof and extended out of the rear side of the holder body. The signal terminals are respectively extended from the transmission terminals and terminating in a front mating contact segment. The front mating contact segments of the signal terminals are suspended in the accommodation open space in the front extension. The mating terminals are respectively formed integral with and extended from the conducting terminals, and respectively terminating in a respective curved mating contact section. The curved mating contact sections of the mating terminals are respectively suspended in the terminal slots in the front tongue. The EMI shielding shell surrounds the electrical insulating terminal holder, comprising a main shell part, a main accommodation chamber defined in the main shell part and adapted for accommodating the holder body of the electrical insulating terminal holder, a first sub shell part and a second sub shell part forwardly extended from a front bottom side of the main shell part, a first sub accommodation chamber defined in the sub shell part and adapted for accommodating the front extension of the electrical insulating terminal holder, and a second sub accommodation chamber defined in the second sub shell part and adapted for accommodating the front tongue of the electrical insulating terminal holder. 
     Further, the elongated openings in the holder body of the electrical insulating terminal holder, the conducting terminals of the conducting terminal set and the main accommodation chamber in the main shell part of the EMI shielding shell are configured to fit USB3.0 connector; the abutment surface of the holder body of the electrical insulating terminal holder, the mating terminals of the conducting terminal set and the main accommodation chamber in the main shell part of the EMI shielding shell are configured to USB2.0 or HDMI connector; the front extension of the electrical insulating terminal holder, the signal terminals of the conducting terminal set and the first sub shell part of the EMI shielding shell are configured to fit Micro USB2.0 or Mini HDMI connector; the front tongue of the electrical insulating terminal holder, the mating terminals of the conducting terminal set and the second sub shell part of the EMI shielding shell are configured to fit Micro USB3.0. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an oblique top elevation of an electrical connector adapter in accordance with a first embodiment of the present invention. 
         FIG. 2  is an exploded view of the electrical connector adapter in accordance with the first embodiment of the present invention. 
         FIG. 3  corresponds to  FIG. 2  when viewed from another angle. 
         FIG. 4  is a top plain view illustrating the arrangement of the conducting terminal set of the electrical connector adapter in accordance with the first embodiment of the present invention. 
         FIG. 5  is a schematic exploded view illustrating an application status of the electrical connector adapter in accordance with the first embodiment of the present invention. 
         FIG. 6  is a sectional side view illustrating an external electrical connector connected to the electrical connector adapter in accordance with the first embodiment of the present invention. 
         FIG. 7  is an oblique top elevational view of an electrical connector adapter in accordance with a second embodiment of the present invention. 
         FIG. 8  is an exploded view of the electrical connector adapter in accordance with the second embodiment of the present invention. 
         FIG. 9  corresponds to  FIG. 8  when viewed from another angle. 
         FIG. 10  is a top plain view illustrating the arrangement of the conducting terminal set of the electrical connector adapter in accordance with the second embodiment of the present invention. 
         FIG. 11  is a sectional side view of the conducting terminal set of the electrical connector adapter in accordance with the second embodiment of the present invention. 
         FIG. 12  is a schematic exploded view illustrating an application status of the electrical connector adapter in accordance with the second embodiment of the present invention. 
         FIG. 13  is a sectional side view illustrating an external electrical connector connected to the electrical connector adapter in accordance with the second embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to  FIGS. 1-4 , an electrical connector adapter in accordance with a first embodiment of the present invention is shown. As illustrated, the electrical connector adapter in accordance with this first embodiment comprises an electrical insulating terminal holder  1 , a conducting terminal set  2 , and an EMI (electromagnetic interference) shielding shell  3 . 
     The electrical insulating terminal holder  1  comprises a holder body  11 , a plurality of elongated openings  110  cut through opposing top and bottom walls of the holder body  11 , a front extension  12  forwardly extended from a lower part of a front side of the holder body  11 , and an accommodation open space  120  defined in the front extension  12 . 
     The conducting terminal set  2  comprises a plurality of conducting terminals  21 , transmission terminals  22  and signal terminals  23 . Each conducting terminal  21  comprises a mating contact end portion  211  located at a front end thereof, and a bonding end portion  212  located at an opposite rear end thereof. Each transmission terminal  22  comprises a mating contact end piece  221  located at a front end thereof, and a bonding end piece  222  located at an opposite rear end thereof. The signal terminals  23  are respectively formed integral with the mating contact end pieces  221  of the transmission terminals  22 , i.e., the mating contact end piece  221  of each transmission terminal  22  is curved sideways in direction toward the longitudinal central axis of the electrical insulating terminal holder  1 , and then bent vertically downwards and then forwards, and then horizontally terminating in one respective signal terminal  23 . 
     The EMI shielding shell  3  comprises a main shell part  31 , a main accommodation chamber  310  defined in the main shell part  31 , a first sub shell part  32  forwardly extended from a front bottom side of the main shell part  31 , and a first sub accommodation chamber  320  defined in the first sub shell part  32 . 
     When assembling the electrical connector adapter, mount the conducting terminals  21  and the transmission terminals  22  in the electrical insulating terminal holder  1  in such a manner that the mating contact end portions  211  of the conducting terminals  21  are respectively suspended in the elongated openings  110  within the holder body  11 , and the bonding end portions  212  of the conducting terminals  21  are respectively extended out of an opposing rear side of the holder body  11 ; the mating contact end pieces  221  of the transmission terminals  22  are respectively suspended in the accommodation open space  120  within the front extension  12 , and the bonding end pieces  222  of the transmission terminals  22  are respectively extended out of the rear side of the holder body  11  in co-planar relationship to the bonding end portions  212  of the conducting terminals  21 . Thereafter, attach the EMI shielding shell  3  to the electrical insulating terminal holder  1  to have the holder body  11  and front extension  12  of the electrical insulating terminal holder  1  be respectively accommodated in the main accommodation chamber  310  in the main shell part  31  and the first sub accommodation chamber  320  in the first sub shell part  32 . At this time, the electrical insulating terminal holder  1 , the conducting terminal set  2  and the EMI shielding shell  3  are assembled together, forming a predetermined first electrical connector (for example, USB3.0 connector, wherein the holder body  11  of the electrical insulating terminal holder  1 , the transmission terminals  22  of the conducting terminal set  2  and the main shell part  31  of the EMI shielding shell  3  constitute a predetermined second electrical connector (for example, USB2.0 or HDMI connector); the front extension  12  of the electrical insulating terminal holder  1 , the signal terminals  23  of the conducting terminal set  2  and the first sub shell part  32  of the EMI shielding shell  3  constitute a predetermined third electrical connector (for example, Micro USB or Mini HDMI connector). 
     Further, the width and height of the front extension  12  of the electrical insulating terminal holder  1  are relatively smaller than the width and height of the holder body  11 . The width and height of the first sub shell part  32  of the EMI shielding shell  3  are relatively smaller than the width and height of the main shell part  31  of the EMI shielding shell  3 . The main shell part  31  and first sub shell part  32  of the EMI shielding shell  3  are respectively configured to fit the holder body  11  and front extension  12  of the electrical insulating terminal holder  1 . Thus, the holder body  11  of the electrical insulating terminal holder  1 , the conducting terminals  21  of the conducting terminal set  2  and the main shell part  31  of the EMI shielding shell  3  can constitute a predetermined first electrical connector (for example, USB3.0 connector); the holder body  11  of the electrical insulating terminal holder  1 , the transmission terminals  22  of the conducting terminal set  2  and the main shell part  31  of the EMI shielding shell  3  can constitute a predetermined second electrical connector (for example, USB2.0 or HDMI connector); the front extension  12  of the electrical insulating terminal holder  1 , the signal terminals  23  of the conducting terminal set  2  and the first sub shell part  32  of the EMI shielding shell  3  can constitute a predetermined third electrical connector (for example, Micro USB or Mini HDMI connector). 
     Further, in this embodiment, the main shell part  31  and first sub shell part  32  of the EMI shielding shell  3  are integrally made in one piece. Alternatively, the main shell part  31  and the first sub shell part  32  can be separately made, and then bonded together by using a soldering, high frequency welding or spot gluing technique. 
     Further, the number of the conducting terminals  21  of the conducting terminal set  2  is 5, i.e., the 1 st  grounding terminal  2101 , the 1 st  differential signal terminal  2102 , the 2 nd  differential signal terminal  2103 , the 3 nd  differential signal terminal  2104  and the 4 th  differential signal terminal  2105 , wherein the 1 st  grounding terminal  2101  is arranged on the middle, the 1 st  differential signal terminal  2102  and the 4 th  differential signal terminal  2105  are arranged in parallel at two opposite lateral sides relative to the 1 st  grounding terminal  2101 , and the 2 nd  differential signal terminal  2103  and the 3 rd  differential signal terminal  2104  are arranged in parallel and respectively spaced between the 1 st  grounding terminal  2101  and the 1 st  differential signal terminal  2102  and 4 th  differential signal terminal  2105 . The number of the transmission terminals  22  is 4, i.e., the 5 th  differential signal terminal  2201 , the 6 th  differential signal terminal  2202 , the 1 st  power terminal  2203  and the 2 st  grounding terminal  2204 , wherein the 5 th  differential signal terminal  2201  and the 6 th  differential signal terminal  2202  are arranged in parallel between the 1 st  grounding terminal  2101  and the 2 nd  differential signal terminal  2103  and the 3 rd  differential signal terminal  2104 ; the 1 st  power terminal  2203  and the 2 nd  grounding terminal  2204  are arranged in parallel at two opposite lateral sides relative to the conducting terminals  21 . The signal terminals  23  are respectively extended from the mating contact end pieces  221  of the transmission terminals  22 , and classified as the 7 th  differential signal terminal  2301 , the 8 th  differential signal terminal  2302 , the 2 nd  power terminal  2303  and the 3 rd  grounding terminal  2304 , wherein the 7 th  differential signal terminal  2301  and the 8 th  differential signal terminal  2302  are arranged in parallel on the middle; the 2 nd  power terminal  2303  and the 3 rd  grounding terminal  2304  are arranged in parallel at two opposite lateral sides relative to the 7 th  differential signal terminal  2301  and the 8 th  differential signal terminal  2302 . The conducting terminal set  2  further comprises a supplementary transmission terminal  2305  connected to an inner side of the 3 rd  grounding terminal  2304 , enabling the signal terminals  23  to fit USB/OTG specifications, and a supplementary support unit  24  disposed at two opposite lateral sides relative to the signal terminals  23 . The supplementary support unit  24  comprises a first supplementary support rib  241  and a second supplementary support rib  242  respectively outwardly extended from the 2 nd  power terminal  2303  and the 3 rd  grounding terminal  2304 , and two resilient retaining rods  243 ;  244  respectively extended from the first supplementary support rib  241  and the second supplementary support rib  242 . The EMI shielding shell  3  further comprises two locating slots  321  respectively located at the first sub shell part  32  for securing the resilient retaining rods  243 ;  244  of the supplementary support unit  24 , enabling the front extension  12  of the electrical insulating terminal holder  1 , the signal terminals  23  of the conducting terminal set  2  and the first sub shell part  32  of the EMI shielding shell  3  to fit Micro USB2.0 specifications. Further, the arrangement of the supplementary support unit  24  greatly enhances the structural strength of the front extension  12  and also greatly improves the EMI shielding performance of the electrical connector adapter. 
     Further, each transmission terminal  22  further comprises a connection portion  225  extending sideways in direction from the mating contact end piece  221  thereof toward the center axis of the electrical insulating terminal holder  1  and connected between the mating contact end piece  221  and the associating horizontally extended signal terminal  23 , a first bent  223  connected between the mating contact end piece  221  and the connection portion  225 , and a second bent  224  connected between the connection portion  225  and the associating signal terminal  23 . Further, the first supplementary support rib  241  and the second supplementary support rib  242  are respectively outwardly extended from the connection portions  225  of the 2 nd  power terminal  2303  and 3 rd  grounding terminal  2304  between the respective first bents  223  and respective second bents  224 . Subject to the above-described arrangement, the signal terminals  23  are disposed relatively closer to each other when compared to the arrangement of the conducting terminals  21  and the transmission terminals  22 , enabling respective front mating contact segments  231  of the signal terminals  23  to be arranged in the front extension  12  of the electrical insulating terminal holder  1 . Further, as stated above, the bonding end pieces  222  of the transmission terminals  22  and the bonding end portions  212  of the conducting terminals  21  are respectively extended out of the rear side of the holder body  11  of the electrical insulating terminal holder  1  and arranged in co-planar relationship with one another. Further, the bonding end portions  212  and the bonding end pieces  222  each have a width gradually increasing in direction away from the holder body  11  to facilitate bonding to a respective metal contact at an external circuit board (not shown), enhancing bonding contact area and signal transmission stability. 
     Referring to  FIGS. 5 and 6  and  FIGS. 2 and 3  again, the front extension  12  of the electrical insulating terminal holder  1 , the signal terminals  23  of the conducting terminal set  2  and the first sub shell part  32  of the EMI shielding shell  3  are adapted for the connection of, for example, Micro USB2.0 or Mini HDMI connector. 
     Further, the holder body  11  of the electrical insulating terminal holder  1 , the conducting terminals  21  of the conducting terminal set  2  and the main shell part  31  of the EMI shielding shell  3  are adapted for the connection of, for example, a USB3.0, USB2.0 or HDMI connector. When connecting the electrical connector adapter to a mating electrical connector  4 , insert the holder body  11  of the electrical insulating terminal holder  1  with the main shell part  31  of the EMI shielding shell  3  into an insertion hole  40  of the mating electrical connector  4  to force the front extension  12  of the electrical insulating terminal holder  1  and the first sub shell part  32  of the EMI shielding shell  3  into an internal receiving chamber  401  in the insertion hole  40 . Thus, the front extension  12  of the electrical insulating terminal holder  1  and the sub shell part  32  of the EMI shielding shell  3  do not interfere with the connection between the holder body  11  of the electrical insulating terminal holder  1  and the mating electrical connector  4  for signal transmission. Thus, the electrical connector adapter saves much installation space, facilitates convenient use without causing interference, and provides a wide range of applications. 
     Referring to  FIGS. 7 ,  8 ,  9  and  10 , an electrical connector adapter in accordance with a second embodiment of the present invention is shown. As illustrated, the electrical connector adapter in accordance with this second embodiment comprises an electrical insulating terminal holder  1 , a conducting terminal set  2 , and an EMI (electromagnetic interference) shielding shell  3 . 
     The electrical insulating terminal holder  1  comprises a holder body  11 , a plurality of elongated openings  110  of different widths cut through opposing top and bottom walls of the holder body  11 , an abutment surface  111  disposed at a front side relative to the elongated openings  110 , and a front extension  12  and a front tongue  13  forwardly extended from a front side of the holder body  11 , an accommodation open space  120  defined in the front extension  12 , and a plurality of terminal slots  130  defined in the front tongue  13 . 
     The conducting terminal set  2  comprises a plurality of conducting terminals  21 , a plurality of transmission terminals  22 , a plurality of signal terminals  23 , a supplementary support unit  24 , and a plurality of mating terminals  25 . Each conducting terminal  21  comprises a mating contact end portion  211  located at a front end thereof, and a bonding end portion  212  located at an opposite rear end thereof. Each transmission terminal  22  comprises a mating contact end piece  221  located at a front end thereof, and a bonding end piece  222  located at an opposite rear end thereof. The conducting terminals  21  are classified as the 1 st  grounding terminal  2101 , the 1 st  differential signal terminal  2102 , the 2 nd  differential signal terminal  2103 , the 3 rd  differential signal terminal  2104  and the 4 th  differential signal terminal  2105 , wherein the 1 st  grounding terminal  2101  is arranged on the middle, the 1 st  differential signal terminal  2102  and the 4 th  differential signal terminal  2105  are arranged in parallel at two opposite lateral sides relative to the 1 st  grounding terminal  2101 , and the 2 nd  differential signal terminal  2103  and the 3 rd  differential signal terminal  2104  are arranged in parallel and respectively spaced between the 1 st  grounding terminal  2101  and the 1 st  differential signal terminal  2102  and 4 th  differential signal terminal  2105 . Further, each conducting terminal  21  comprises a connection arm  214  connected between the mating contact end portion  211  thereof and one respective mating terminal  25 , a third bent  213  connected between the mating contact end portion  211  and the connection arm  214 , and a fourth bent  215  connected between the connection arm  214  and the respective mating terminal  25 . The mating terminals  25  are respectively formed integral with and extended from the fourth bents  215  of the conducting terminals  21  and respectively terminating in a respective curved mating contact section  251 . The transmission terminals  22  are classified as the 5 th  differential signal terminal  2201 , the 6 th  differential signal terminal  2202 , the 1 st  power terminal  2203  and the 2 nd  grounding terminal  2204 , wherein the 5 th  differential signal terminal  2201  and the 6 th  differential signal terminal  2202  are arranged in parallel between the 1 st  grounding terminal  2101  and the 2 nd  differential signal terminal  2103  and the 3 rd  differential signal terminal  2104 ; the 1 st  power terminal  2203  and the 2 nd  grounding terminal  2204  are arranged in parallel at two opposite lateral sides relative to the conducting terminals  21 . The signal terminals  23  are respectively extended from the mating contact end pieces  221  of the transmission terminals  22 , and classified as the 7 th  differential signal terminal  2301 , the 8 th  differential signal terminal  2302 , the 2 nd  power terminal  2303  and the 3 rd  grounding terminal  2304 , wherein the 7 th  differential signal terminal  2301  and the 8 th  differential signal terminal  2302  are arranged in parallel on the middle; the 2 nd  power terminal  2303  and the 3 rd  grounding terminal  2304  are arranged in parallel at two opposite lateral sides relative to the 7 th  differential signal terminal  2301  and the 8 th  differential signal terminal  2302 . Further, each transmission terminal  22  comprises a connection portion  225  extending sideways in direction from the mating contact end piece  221  thereof toward the center axis of the electrical insulating terminal holder  1  and connected between the mating contact end piece  221  and the associating horizontally extended signal terminal  23 , a first bent  223  connected between the mating contact end piece  221  and the connection portion  225 , and a second bent  224  connected between the connection portion  225  and the associating signal terminal  23 . The conducting terminal set  2  further comprises a supplementary transmission terminal  2305  connected to an inner side of the 3 rd  grounding terminal  2304 , enabling the signal terminals  23  to fit USB/OTG specifications, and a supplementary support unit  24 , which comprises two resilient retaining rods  243 ;  244  respectively extended from the connection portion  225 . 
     The EMI shielding shell  3  comprises a main shell part  31 , a main accommodation chamber  310  defined in the main shell part  31 , a first sub shell part  32  and a second sub shell part  33  forwardly extended from a front bottom side of the main shell part  31 , a first sub accommodation chamber  320  defined in the sub shell part  32 , and a second sub accommodation chamber  330  defined in the second sub shell part  33 . 
     When assembling the electrical connector adapter, mount the conducting terminals  21 , the transmission terminals  22 , the signal terminals  23 , the supplementary support unit  24  and the mating terminals  25  in the electrical insulating terminal holder  1  in such a manner that the mating contact end portions  211  of the conducting terminals  21  are respectively suspended in the elongated openings  110  within the holder body  11 , and the bonding end portions  212  of the conducting terminals  21  are respectively extended out of an opposing rear side of the holder body  11 ; the mating contact end pieces  221  of the transmission terminals  22  are respectively supported on the abutment surface  111 , and the bonding end pieces  222  of the transmission terminals  22  are respectively extended out of the rear side of the holder body  11  in co-planar relationship to the bonding end portions  212  of the conducting terminals  21 ; the front mating contact segments  231  of the signal terminals  23  are respectively suspended in the accommodation open space  120  within the front extension  12 ; the curved mating contact sections  251  of the mating terminals  25  are respectively positioned in the terminal slots  130  within the front tongue  13 . Thereafter, attach the EMI shielding shell  3  to the electrical insulating terminal holder  1  to have the holder body  11 , front extension  12  and front tongue  13  of the electrical insulating terminal holder  1  be respectively accommodated in the main accommodation chamber  310  in the main shell part  31 , the first sub accommodation chamber  320  in the first sub shell part  32  and the second sub accommodation chamber  330  in the second sub shell part  33 . At this time, the electrical insulating terminal holder  1 , the conducting terminal set  2  and the EMI shielding shell  3  are assembled together, wherein the holder body  11  of the electrical insulating terminal holder  1 , the conducting terminals  21  of the conducting terminal set  2  and the main shell part  31  of the EMI shielding shell  3  constitute a predetermined electrical connector (for example, USB3.0 connector); the holder body  11  of the electrical insulating terminal holder  1 , the transmission terminals  22  of the conducting terminal set  2  and the main shell part  31  of the EMI shielding shell  3  constitute another predetermined electrical connector (for example, USB2.0 or HDMI connector); the front extension  12  of the electrical insulating terminal holder  1 , the signal terminals  23  of the conducting terminal set  2  and the first sub shell part  32  of the EMI shielding shell  3  constitute still another predetermined electrical connector (for example, Micro USB or Mini HDMI connector); the front tongue  13  of the electrical insulating terminal holder  1 , the mating terminals  25  of the conducting terminal set  2  and the second sub shell part  33  of the EMI shielding shell  3  constitute a yet further predetermined electrical connector (for example, Micro USB3.0 connector). 
     Further, the widths and heights of the front extension  12  and front tongue  13  of the electrical insulating terminal holder  1  are relatively smaller than the width and height of the holder body  11 . The widths and heights of the first sub shell part  32  and second sub shell part  33  of the EMI shielding shell  3  are relatively smaller than the width and height of the main shell part  31  of the EMI shielding shell  3 . The main shell part  31 , first sub shell part  32  and second sub shell part  33  of the EMI shielding shell  3  are respectively configured to fit the holder body  11 , front extension  12  and front tongue  13  of the electrical insulating terminal holder  1 . Thus, the holder body  11  of the electrical insulating terminal holder  1 , the conducting terminals  21  of the conducting terminal set  2  and the main shell part  31  of the EMI shielding shell  3  can constitute a predetermined electrical connector (for example, USB3.0 connector); the abutment surface  111  of the holder body  11  of the electrical insulating terminal holder  1 , the transmission terminals  22  of the conducting terminal set  2  and the main shell part  31  of the EMI shielding shell  3  can constitute another predetermined electrical connector (for example, USB2.0 or HDMI connector); the front extension  12  of the electrical insulating terminal holder  1 , the signal terminals  23  of the conducting terminal set  2  and the first sub shell part  32  of the EMI shielding shell  3  can constitute still another predetermined electrical connector (for example, Micro USB2.0 or Mini HDMI connector); the front tongue  13  of the electrical insulating terminal holder  1 , the mating terminals  25  of the conducting terminal set  2  and the second sub shell part  33  of the EMI shielding shell  3  can constitute a yet further predetermined electrical connector (for example, Micro USB3.0 connector). 
     Further, in this embodiment, the main shell part  31 , first sub shell part  32  and second sub shell part  33  of the EMI shielding shell  3  are integrally made in one piece. Alternatively, the main shell part  31 , the first sub shell part  32  and the second sub shell part  33  can be separately made, and then bonded together by using a soldering, high frequency welding or spot gluing technique. 
     Referring to  FIG. 11  and  FIGS. 8-10  again, as stated above, the conducting terminal set  2  comprises conducting terminals  21 , transmission terminals  22 , signal terminals  23 , a supplementary support unit  24  and mating terminals  25 . The 5 pcs of conducting terminals  21  are classified as the 1 st  grounding terminal  2101 , the 1 st  differential signal terminal  2102 , the 2 nd  differential signal terminal  2103 , the 3 rd  differential signal terminal  2104  and the 4 th  differential signal terminal  2105 , wherein the 1 st  grounding terminal  2101  is arranged on the middle, the 1 st  differential signal terminal  2102  and the 4 th  differential signal terminal  2105  are arranged in parallel at two opposite lateral sides relative to the 1 st  grounding terminal  2101 , and the 2 nd  differential signal terminal  2103  and the 3 rd  differential signal terminal  2104  are arranged in parallel and respectively spaced between the 1 st  grounding terminal  2101  and the 1 st  differential signal terminal  2102  and 4 th  differential signal terminal  2105 . The 4 pcs of transmission terminals  22  are classified as the 5 th  differential signal terminal  2201 , the 6 th  differential signal terminal  2202 , the 1 st  power terminal  2203  and the 2 nd  grounding terminal  2204 , wherein the 5 th  differential signal terminal  2201  and the 6 th  differential signal terminal  2202  are arranged in parallel at two opposite lateral sides relative to the 1 st  grounding terminal  2101  and between the 2 nd  differential signal terminal  2103  and the 3 rd  differential signal terminal  2104 ; the 1 st  power terminal  2203  and the 2 nd  grounding terminal  2204  are arranged in parallel at two opposite lateral sides relative to the conducting terminals  21  and the 5 th  differential signal terminal  2201  and 6 th  differential signal terminal  2202 . 
     Further, the mating terminals  25  are respectively formed integral with and extended from the fourth bents  215  of the respective conducting terminals  21  and respectively terminating in a respective curved mating contact section  251 , i.e., the number of the mating terminals  25  is 5, and the 5 pcs of mating terminals  25  are classified as the 4 th  grounding terminal  2501  disposed on the middle, the 9 th  differential signal terminal  2502  and the 12 th  differential signal terminal  2505  arranged in parallel at two opposite lateral sides relative to the 4 th  grounding terminal  2501 , and the 10 th  differential signal terminal  2503  and the 11 th  differential signal terminal  2504  arranged in parallel and respectively spaced between the 4 th  grounding terminal  2501  and the 9 th  differential signal terminal  2502  and 12 th  differential signal terminal  2505 . The 4 pcs of signal terminals  23  are respectively extended from the mating contact end pieces  221  of the transmission terminals  22 , and classified as the 7 th  differential signal terminal  2301 , the 8 th  differential signal terminal  2302 , the 2 nd  power terminal  2303  and the 3 rd  grounding terminal  2304 . The 7 th  differential signal terminal  2301  and the 8 th  differential signal terminal  2302  are arranged in parallel on the middle. The 2 nd  power terminal  2303  and the 3 rd  grounding terminal  2304  are arranged in parallel at two opposite lateral sides relative to the 7 th  differential signal terminal  2301  and the 8 th  differential signal terminal  2302 . The conducting terminal set  2  further comprises a supplementary transmission terminal  2305  connected to an inner side of the 3 rd  grounding terminal  2304 , enabling the signal terminals  23  to fit USB/OTG specifications. The first supplementary support rib  241  and second supplementary support rib  242  of the supplementary support unit  24  are respectively outwardly extended from the 2 nd  power terminal  2303  and the 3 rd  grounding terminal  2304 . The supplementary support unit  24  further comprises two resilient retaining rods  243 ;  244  respectively. The EMI shielding shell  3  further comprises two locating slots  321  respectively located at the first sub shell part  32  for securing the resilient retaining rods  243 ;  244  of the supplementary support unit  24 , enabling the front extension  12  of the electrical insulating terminal holder  1 , the signal terminals  23  of the conducting terminal set  2  and the first sub shell part  32  of the EMI shielding shell  3  to fit Micro USB2.0 specifications. Further, the arrangement of the supplementary support unit  24  greatly enhances the structural strength of the front extension  12  and also greatly improves the EMI shielding performance of the electrical connector adapter. 
     Referring to  FIGS. 12 and 13  and  FIGS. 8 ,  9  and  12  again, during application of the electrical connector adapter of the present invention, the elongated openings  110  in the holder body  11  of the electrical insulating terminal holder  1 , the conducting terminals  21  of the conducting terminal set  2  and the main accommodation chamber  310  in the main shell part  31  of the EMI shielding shell  3  constitute a predetermined electrical connector (for example, USB3.0 connector; the abutment surface  111  of the holder body  11  of the electrical insulating terminal holder  1 , the mating terminals  25  of the conducting terminal set  2  and the main accommodation chamber  310  in the main shell part  31  of the EMI shielding shell  3  constitute another predetermined electrical connector (for example, USB2.0 or HDMI connector); the front extension  12  of the electrical insulating terminal holder  1 , the signal terminals  23  of the conducting terminal set  2  and the first sub shell part  32  of the EMI shielding shell  3  constitute still another predetermined electrical connector (for example, Micro USB2.0 or Mini HDMI connector); the front tongue  13  of the electrical insulating terminal holder  1 , the mating terminals  25  of the conducting terminal set  2  and the second sub shell part  33  of the EMI shielding shell  3  constitute a yet further predetermined electrical connector (for example, Micro USB3.0) 
     In conclusion, the invention provides an electrical connector adapter, which comprises an electrical insulating terminal holder  1  comprising a holder body  11  defining a plurality of elongated openings  110  and an abutment surface  111 , a front extension  12  and a front tongue  13 , a conducting terminal set  2  comprising a plurality of conducting terminals  21 , a plurality of transmission terminals  22 , a plurality of signal terminals  23 , a supplementary support unit  24  and a plurality of mating terminals  25 , and an EMI (electromagnetic interference) shielding shell  3  comprising a main shell part  31 , a first sub shell part  32  and a second sub shell part  33 , wherein the component parts are configured to selectively fit USB3.0, USB2.0, HDMI, Micro USB3.0, Micro USB2.0 or Mini HDM. Therefore, the electrical connector adapter of the present invention saves much installation space, facilitates convenient use without causing interference, and provides a wide range of applications. 
     Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.