Patent Publication Number: US-8113882-B1

Title: USB connector

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to USB connectors and more particularly, to such a USB connector, which has a rear cover fastened to the rear side of the first connection port and the top side of the bottom positioning member to shield the first and second conducting terminals, the adapter terminals and the circuit module, prohibiting them from contacting the outer metal shield to cause a short circuit. 
     2. Description of the Related Art 
     Following fast development of modern electronic technology, many different advanced and small-sized electronic devices have been intensively used in our daily life. Nowadays, many people use notebook computer instead of desk computer for the advantage of high mobility. Further, different interface devices shall be used for data and/or signal transmission between a host and different peripheral apparatus, or among different electronic devices. USB (Universal Serial Bus) interface devices are most popularly used interface devices for the advantage of hot-plug capabilities. 
     An early design of USB 2.0 standard (USB Hi-Speed) improves the transmission speed from 12 Mbps up to 480 Mbps. However, this design can simply be used in a peripheral apparatus (such as card reader, printer, memory stick, network phone, and network camera) of low driving power. Nowadays, these data transmission speeds cannot satisfy the demand for quick transmission of a big amount of data within a limited time, i.e., USB2.0 cannot be used with a high capacity hard disk drive or DVD copier, DVD player or any advanced blue light electronic device. In consequence, high speed data transmission connectors have been continuously created. For example, USB 3.0 standard (USB Super-Speed) provides a transmission speed as high as 4.8 Gbps. In consideration of compatibility to conventional USB 2.0, USB 3.0 maintains the original conducting terminals and adds an extra set of conducting terminals, i.e. a USB 3.0 connector has two sets of conducting terminals arranged therein to support two-way transmission at a high speed. The enhanced power supplying capability of USB 3.0 standard allows the use of a detachable high-capacity hard disk drive without extra power supply, and also permits connection of extra peripheral apparatus. 
       FIG. 14  illustrates a conventional USB 2.0 multi-port connector. According to this design, the USB 2.0 multi-port connector comprises a connector body A, an upper row of conducting terminals B, a bottom row of conducting terminals C and a metal shield D. The connector body A defines therein a first connection port A 1  and a second connection port A 2 . The upper row of conducting terminals B and the bottom row of conducting terminals C are respectively mounted in the first connection port A 1  and second connection port A 2  of the connector body A. The conducting terminals B;C each have a signal input end B 1 ;C 1  extended out of the connector body A and bonded to an external circuit board, and a signal output end B 2 ;C 2  suspending in the first connection port A 1  or second connection port A 2  at the bottom side. The metal shielding shell C surrounds the connector body A, comprising a front shell D 1 , a back shell D 2  and a middle clamping plate D 3 . The front shell D 1 , the back shell D 2  and the middle clamping plate D 3  are assembled together for grounding and electromagnetic protection. During application, the first connection port A 1  and second connection port A 2  of the connector body A can receive a respective external USB 2.0 connector for signal transmission between electronic apparatus. 
     Based on the design of the aforesaid USB2.0 female connector, extra conducting terminals may be installed in the connector body A to constitute a USB3.0 female connector. However, due to limited internal space, it is difficult to install an extra row of conducting terminals in the connector body A. Further, when a big number of conducting terminals are installed in the connector body A, signal transmission interference may occur, lowering the signal transmission quality and increasing the risk of electromagnetic interference. Further, after installation, the upper row of conducting terminals B and the bottom row of conducting terminals C may touch the metal shield D accidentally, causing a short circuit and increasing product defective rate. 
     Therefore, it is desirable to provide a USB connector, which eliminates the drawbacks of conventional USB2.0 multi-port connectors. 
     SUMMARY OF THE INVENTION 
     The present invention has been accomplished under the circumstances in view. Therefore, it is the main object of the present invention to provide a USB connector, which has an electrically insulative rear cover fastened to the rear side of the first connection port and the top side of the connection member of bottom positioning member to shield the rear bonding portions of the first conducting terminals and second conducting terminals, the adapter terminals and the circuit module and to prohibit them from contacting the outer metal shield to cause a short circuit. Further, the rear cover has a plurality of locating flanges respectively from the front side and bottom sides thereof and respectively engaged into a receiving chamber and locating grooves of the connector body, assuring installation stability. 
     Further, the adapter board of the circuit module of the USB connector comprises two rows of first metal contacts and second metal contact for the bonding of the connection portions of the metal connection terminals and the connection portions of the adapter terminals respectively by means of surface mount technology so that the surface space of the adapter board can be fully utilized for the installation of electronic components to maintain their electric properties for best performance. 
     Further, the first connection port has the bottom side thereof mounted with a bottom positioning member. In an alternate form of the invention, the USB connector comprises a first connection port and a second connection port defined in the connector body thereof, a bottom positioning member located on the bottom side of the second connection port, a connection block located on the rear side of the bottom positioning member, and a metal shield surrounding the connector body for grounding. The first and second conducting terminals of the first and second connection ports and the metal connection terminals held in the connection block are well shield and isolated, avoiding electromagnetic interference. The electrically insulative component parts are conveniently fastened by hooking, assuring high connection stability for plugging and unplugging of an external USB connector. 
     Further, electronic components are installed in the adapter board. The adapter board comprises a set of first contacts and a set of second contact for the bonding of the rear bonding portion of the first conducting terminals and second conducting terminals of the first connection port and the rear bonding portion of the first conducting terminals and second conducting terminals of the second connection port respectively, and a set of first metal pads and a set of second metal pads respectively arranged at the rear side thereof corresponding to the electronic components. The electronic components include filter devices that can be CMC (common mode chokes), filter resistors and/or filter capacitors, and protection devices that can be TVS (transient voltage suppressor and/or varistor for protection against surge and/or static electricity. Thus, the electronic components of the adapter board effectively remove noises, electromagnetic interference, transient voltage, surge or static electricity during signal transmission, assuring signal transmission quality and reliability and avoiding signal interrogation or signal transmission failure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded view of a USB connector in accordance with a first embodiment of the present invention. 
         FIG. 2  corresponds to  FIG. 1  when viewed from another angle. 
         FIG. 3  is a sectional side view of the USB connector in accordance with the first embodiment of the present invention. 
         FIG. 4  is a circuit diagram of the USB connector in accordance with the first embodiment of the present invention. 
         FIG. 5  is an exploded view of a USB connector in accordance with a second embodiment of the present invention. 
         FIG. 6  corresponds to  FIG. 5  when viewed from another angle. 
         FIG. 7  is a sectional side view of the USB connector in accordance with the second embodiment of the present invention. 
         FIG. 8  is a circuit diagram of the USB connector in accordance with the second embodiment of the present invention (I). 
         FIG. 9  is a circuit diagram of the USB connector in accordance with the second embodiment of the present invention (II). 
         FIG. 10  is a schematic applied view of the second embodiment of the present invention. 
         FIG. 11  is a circuit diagram of the USB connector in accordance with the second embodiment of the present invention (III). 
         FIG. 12  is a circuit diagram of the USB connector in accordance with the second embodiment of the present invention (IIII). 
         FIG. 13  is a circuit diagram of the USB connector in accordance with the second embodiment of the present invention (V). 
         FIG. 14  is an exploded view of a USB connector according to the prior art. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to  FIGS. 1˜4 , a USB connector in accordance with a first embodiment of the present invention is shown comprising a connector body  1 , a circuit module  2  and a metal shield  4 . 
     The connector body  1  comprises a first connection port  11  and a bottom positioning member  12  fastened to the bottom side of the first connection port  11 . The first connection port  11  comprises a forwardly extending tongue plate  111  having multiple bottom terminal grooves  1111 , a set of first conducting terminals  112  mounted in the top side of the tongue plate  111 , a set of second conducting terminals  113  mounted in the bottom terminal grooves  1111  of the tongue plate  111 . The first conducting terminals  112  and second conducting terminals  113  have the respective front contact portions  1121  or  1131  suspending below the tongue plate  111  and arranged in two rows and the respective rear bonding portions  1122  or  1132  extending out of the rear side of the first connection port  11 . The first connection port  11  further comprises a plurality of bottom hooks  114  and bottom mounting rods  115 . The bottom positioning member  12  comprises a plurality of retaining blocks  121  and retaining holes  122  disposed at the top side thereof, multiple terminal slots  123  vertically cut through the top and bottom sides near the rear side thereof and holding a set of adapter terminals  124 . Each adapter terminal  124  has one end terminating in a connection portion  1241  and the other end terminating in a bonding portion  1242 . 
     The circuit module  2  comprises an adapter board  21  carrying a circuit layout, and a plurality of electronic components  22  installed in the adapter board  21 . The electronic components  22  include filter devices  221  that can be CMC (common mode chokes), filter resistors and/or filter capacitors, and protection devices  222  that can be TVS (transient voltage suppressor and/or varistor for protection against surge and/or static electricity. According to this embodiment, 6 filter devices  221  are arranged in two rows on the front side of the adapter board  21 ; 3 protection devices  222  are arranged in a row and spaced between the two rows of filter devices  221 . The adapter board  21  comprises a set of first contacts  211  and a set of second contacts  212  respectively arranged in a row above one respective row of filter devices  221  for the bonding of the rear bonding portion  1122 ; 1132  of the first conducting terminals  112  and second conducting terminals  113  of the first connection port  11  respectively, and a set of first metal pads  213  arranged at the rear side thereof corresponding to the electronic components  22 . The connection portions  1241  of the adapter terminals  124  are respectively bonded to the first metal pads  213  of the adapter board  21 . 
     The metal shield  4  surrounds the connector body  1  and the circuit module  2 , defining a front insertion hole  44  for receiving an external USB connector. 
     During installation, the rear bonding portion  1122 ; 1132  of the first conducting terminals  112  and second conducting terminals  113  of the first connection port  11  are respectively electrically bonded to the first contacts  211  of the adapter board  21 , and then the bottom hooks  114  and bottom mounting rods  115  of the first connection port  11  are respectively fastened to the respective retaining blocks  121  and retaining holes  122  of the bottom positioning member  12 . Thus, the first connection port  11  and the bottom positioning member  12  are fastened together. Thereafter, the connection portions  1241  of the adapter terminals  124  are respectively bonded to the first metal pads  213  of the adapter board  21  by SMT (surface mount technology). At final, fasten the metal shield  4  to the outside wall of the connector body  1 , finishing the assembly process of the USB 3.0 connector. 
       FIGS. 5˜8  illustrate a USB connector in accordance with a second embodiment of the present invention. As illustrated, the USB connector in accordance with this second embodiment of the present invention comprises a connector body  1 , a circuit module  2 , a connection block  3  and a metal shield  4 . 
     The connector body  1  comprises an electrically insulative base member  13 , a first connection port  11  and a second connection port  14  respectively arranged at the top and bottom sides of the electrically insulative base member  13  and a bottom positioning member  12  arranged at the bottom side of the second connection port  14 . According to this embodiment, the electrically insulative base member  13  comprises a plurality of retaining blocks  131  and retaining holes  132  disposed at the top side thereof, a plurality of bottom hooks  133  and bottom mounting rods  134  located on the bottom side thereof. 
     The first connection port  11  comprises a forwardly extending tongue plate  111  having multiple bottom terminal grooves  1111 , a set of first conducting terminals  112  and a set of second conducting terminals  113  mounted in the top and bottom sides of the tongue plate  111  in a parallel manner. The second conducting terminals  113  are respectively positioned in the bottom terminal grooves  1111  of the tongue plate  111 . The first conducting terminals  112  and the second conducting terminals  113  each have a front contact portion  1121  or  1131  suspending below the tongue plate  111 , and a rear bonding portion  1122  or  1132  extending out of the rear side of the first connection port  11 . The first connection port  11  further comprises a plurality of bottom hooks  115  and bottom mounting rods  116 . The first conducting terminals  113  and second conducting terminals  114  of the first connection port  11  each have a front contact portion  1131  or  1141  suspending below the tongue plate  111 , and a rear bonding portion  1132  or  1142  extending out of the rear side of the first connection port  11 . The second connection port  14  comprises a forwardly extending tongue plate  141  having multiple bottom terminal grooves  1411 , and a set of first conducting terminals  142  and a set of second conducting terminals  143  mounted in the top and bottom sides of the tongue plate  141  in a parallel manner. The second conducting terminals  143  are respectively positioned in the bottom terminal grooves  1411  of the tongue plate  141 . The first conducting terminals  142  and the second conducting terminals  134  each have a front contact portion  1421  or  1431  suspending below the tongue plate  141 , and a rear bonding portion  1422  or  1432  extending out of the rear side of the second connection port  14 . The second connection port  14  further comprises a plurality of retaining blocks  144  and retaining holes  145  disposed at the top side and a plurality of bottom hooks  146  and bottom mounting rods  147  disposed at the bottom side. 
     The circuit module  2  comprises an adapter board  21  carrying a circuit layout, and a plurality of electronic components  22  installed in the adapter board  21 . The adapter board  21  comprises a set of first contacts  211  and a set of second contacts  212  respectively arranged in a row above one respective row of filter devices  221  for the bonding of the rear bonding portion  1122 ; 1132  of the first conducting terminals  112  and second conducting terminals  113  of the first connection port  11  and the rear bonding portion  1422 ; 1432  of the first conducting terminals  142  and second conducting terminals  143  of the second connection port  14  respectively, and a set of first metal pads  213  and a set of second metal pads  214  respectively arranged at the rear side thereof corresponding to the electronic components  22 . 
     The connection block  3  comprises a plurality of terminal slots  31  vertically extending through top and bottom sides thereof, and a plurality of locating grooves  33  located on the top side thereof and respectively extended from the top ends of the terminal slots  31 . Further, metal connection terminals  32  are respectively mounted in the terminal slots  31 . Each metal connection terminal  32  has a connection portion  321  located on its one end and a bonding portion  322  located on its other end, and a curved middle portion  323  connected between the connection portion  321  and the bonding portion  322 . The bonding portions  322  of the metal connection terminals  32  extend out of the terminal slots  31  for bonding to an external circuit board. The curved middle portions  323  of the metal connection terminals  32  are respectively positioned in the locating grooves  33 . 
     The metal shield  4  includes a front frame shell  41 , a rear cover shell  42  and an internal clamping shell  43 . The front frame shell  41  and the rear cover shell  42  are fastened together and covered over the connector body  1 . The internal clamping shell  43  is clamped on the electrically insulative base member  13  of the connector body  1 , and stopped against spring lugs  411  of the front frame shell  41 . Further, the internal clamping shell  43  divides the internal space of the front frame shell  41  into two insertion holes  40  for receiving one respective external USB connector. 
     When assembling the first connection port  11  and second connection port  14  of the connector body  1  with the insulative base member  13  and the bottom positioning member  12 , the bottom hooks  115  of the first connection port  11  and the bottom mounting rods  147  of the second connection port  14  are respectively engaged into the retaining holes  122  of the bottom positioning member  12  and the retaining holes  132  of the electrically insulative base member  13 . 
     During installation, as shown in  FIGS. 5˜7 , force the bottom hooks  114  of the first connection port  11  into engagement with the retaining blocks  131  of the electrically insulative base member  13  to have the bottom mounting rods  115  of the first connection port  11  be respectively fitted into the retaining holes  132  of the electrically insulative base member  13 . Thus, the first connection port  11  and the electrically insulative base member  13  are connected together. Thereafter, force the bottom hooks  133  of the electrically insulative base member  13  into engagement with the retaining blocks  144  of the second connection port  14  to have the bottom mounting rods  134  of the electrically insulative base member  13  be respectively fitted into the retaining holes  145  of the second connection port  14 . Thus, the second connection port  14  and the electrically insulative base member  13  are connected together. 
     Thereafter, bond the rear bonding portions  1122 ; 1232  of the first conducting terminals  112  and second conducting terminals  113  of the first connection port  11  electrically to the first contacts  211  of the adapter board  21 , and then bond the rear bonding portions  1422 ; 1432  of the first conducting terminals  142  and second conducting terminals  143  of the second connection port  14  electrically to the second contacts  212  of the adapter board  21 , and then force the bottom hooks  146  of the second connection port  14  into engagement with the retaining holes  121  of the bottom positioning member  12  to have the bottom mounting rods  147  of the second the second connection port  14  be respectively fitted into the retaining holes  122  of the bottom positioning member  12 . Thus, the second connection port  14  and the bottom positioning member  12  are connected together. Thereafter, bond the connection portions  1241  of the adapter terminals  124  of the bottom positioning member  12  to the first metal pads  213  of the adapter board  21  by surface mount technology, and then attach the connection block  3  to the rear side of the bottom positioning member  12  to let the bonding portions  322  of the metal connection terminals  32  be inserted through respective vertical terminal slots  123  of the bottom positioning member  12 , and then bond the connection portions  321  of the metal connection terminals  32  to the second metal pads  214  of the adapter board  21  by surface mount technology, and then mount the metal shield  4  around the connector body  1  to keep the first connection port  11  and the second connection port  14  in the insertion holes  40 . Thus, the USB 3.0 connector is assembled. 
     Referring to  FIGS. 6 ,  7 ,  8 ,  9 , and  10 , the bonding portions  1242  of the adapter terminals  124  of the bottom positioning member  12  and the bonding portions  322  of the metal connection terminals  32  are respectively vertically extending through the vertical terminal slots  123  of the bottom positioning member  12  and bonded to an external circuit board. Further, the internal clamping shell  43  of the metal shield  4  is clamped on the electrically insulative base member  13  of the connector body  1  and stopped against the spring lugs  411  of the front frame shell  41 . After bonding of the bonding portions  1242  of the adapter terminals  124  of the bottom positioning member  12  and the bonding portions  322  of the metal connection terminals  32  to the external circuit board, the metal shield  4  is bonded with its bottom legs into respective via holes of the circuit board to form a grounding loop for discharge of surrounding electromagnetic waves and noises from the adapter board  21  to the grounding terminal of the circuit board. 
     During application of the present invention, an external USB connector is inserted into one insertion hole  40  of the metal shield  4  and attached to the first connection port  11  or second connection port  12 . At this time, the inserted external USB connector is electrically connected to the first conducting terminals  112  and second conducting terminals  113  of the first connection port  11  or the first conducting terminals  142  and second conducting terminals  143  of the second connection port  12  for two-way signal transmission. Thus, external signals can be transmitted through the first conducting terminals  112 ; 142  and second conducting terminals  113 ; 143  of the first and second connection ports  11 ; 14  to the first contacts  211  of the adapter board  21  and the second conducting terminals  143 , enabling the electronic components  22  to remove the unnecessary noises and electromagnetic interference. After filtration by the electronic components  22 , the signal is transmitted through the first metal pads  213  or second metal pads  214 , the adapter terminals  124  or metal connection terminals  32  to the microprocessor, control chip or control IC of the circuit board for signal conversion and serial data output. Thus, the electronic components  22  of the adapter board  21  effectively remove noises, electromagnetic interference, transient voltage, surge or static electricity during signal transmission, assuring signal transmission quality and reliability and avoiding signal interrogation or signal transmission failure. 
     The aforesaid embodiment is simply an example of the present invention but not intended as a limitation. The adapter board  21  has electronic components  22  connected between its signal input ends and its signal output ends. The circuit arrangement of the embodiment in which the connector body  1  simply comprises one first connection port  11  is same as the circuit arrangement of the embodiment in which the connector body  1  comprises one first connection port  11  and one second connection port  14 . Thus, the circuit arrangement of the embodiment in which the connector body  1  comprises one first connection port  11  and one second connection port  14  is explained hereinafter for understanding. The adapter board  21  has 18 signal input ends. These 18 signal input ends are respectively electrically connected to the metal connection terminals  32  and the adapter terminals  124  through the first metal pads  213  and second metal pads  214  of the adapter board  21 . Further, the adapter board  21  has 18 signal output ends for signal output. These 18 signal output ends are respectively electrically connected to the first conducting terminals  112 ; 142  and second conducting terminals  113 ; 143  of the first and second connection ports  11 ; 14  through the first contacts  212  and second contacts  212  of the adapter board  21 . In the first conducting terminals  112 ; 142 , a grounding terminal (GND_DRAIN) is set in between each of the two pairs of signal terminals (StdA_SSRX−;StdA_SSRX+ and StdA_SSTX−;StdA_SSTX+). In the second conducting terminals  113 ; 143 , a power terminal (VBUS) and a power grounding terminal (GND) are respectively arranged at the left and right sides of the pair of signal terminals (D− and D+). 
     Further, the electronic components  22  include filter devices  221  that can be CMC (common mode choke), filter resistor and/or filter capacitor, and protection devices  222  that can be TVS (transient voltage suppressor) and/or varistor for protection against surge and/or static electricity. According to this embodiment, 6 filter devices  221  are arranged in two rows and electrically connected between the signal input ends and signal output ends of the adapter board  21 , i.e., the 6 filter devices  221  are electrically connected between the signal input ends and signal output ends of the adapter board  21  to which the signal terminals (StdA_SSRX−, StdA_SSRX+, StdA_SSTX−, StdA_SSTX+, D− and D+) of the first conducting terminals  112 ; 142  and the second conducting terminals  113 ; 143  are electrically connected. 
     Further, 3 protection devices  222  are electrically connected in parallel to the filter devices  221  between the signal input ends and signal output ends of the adapter board  21  to which the signal terminals (StdA_SSRX−, StdA_SSRX+, GND_DRAIN, StdA_SSTX−, StdA_SSTX+) of the second conducting terminals  113 ; 143  are electrically connected. The signal input ends and signal output ends of the adapter board  21  to which the power terminals (VBUS) of the second conducting terminals  113 ; 143  are electrically connected are respectively electrically connected to one pin of each of the protection devices  222 . The signal input ends and signal output ends of the adapter board  21  to which the power grounding terminals (GND) of the second conducting terminals  113 ; 143  are electrically connected are respectively electrically connected to the other pin of each of the protection devices  222 . The number and/or specifications of the electronic components  22  may be changed subject to different requirements. Thus, an external signal can be transmitted through the first conducting terminals  112  and second conducting terminals  113  of the first connection port  11  or the first conducting terminals  142  and second conducting terminals  143  of the second connection port  14  to the electronic components  22 , enabling the electronic components  22  to remove noises, electromagnetic interference, transient voltage, surge or static electricity, assuring signal transmission quality and reliability and avoiding signal interrogation or signal transmission failure. 
     Referring to  FIGS. 6 ,  8 ,  9 ,  11 ,  12 , and  13 , in the aforesaid examples, the first conducting terminals  112 ; 142  and second conducting terminals  113 ; 143  are configured subject to USB 3.0 standard-A standard. A signal grounding terminal (GND_DRAIN) may be set in between each of the two pairs of signal terminals (StdB_SSTX−;StdB_SSTX+ and StdB_SSRX−; StdB_SSRX+) of the second conducting terminals  113 ; 143  to meet USB 3.0 standard-B standards. A power terminal (DPWR) and a power grounding terminal (DGND) are be properly arranged at one side relative to one pair of signal terminals (StdB_SSRX−; StdB_SSRX+) of the second conducting terminals  113 ; 143  far from the signal grounding terminal (GND_DRAIN) to meet USB 3.0 Powered-B standards. The two pairs of power terminals (DPWR) and power grounding terminals (DGND) are respectively connected in parallel to the protection devices  222 . Further, an identification terminal (ID) may be connected between the signal terminal (D+) and power grounding terminal (GND) of the first conducting terminals  112  or  142 , and a signal grounding terminal (GND DRAIN) is set between the two pairs of signal terminals (MicA_SSTX−; MicA_SSTX+; MicA_SSRX−; MicA_SSRX+; MicA_SSRX+, or MicB_SSTX−; MicB_SSTX+; MicB_SSRX−; MicB_SSRX+; MicB_SSRX+) to meet USB 3.0 Micro-AB/A/B standards. Other equivalent alternations may be adopted without departing from the spirit and scope of the invention. 
     When connecting the first conducting terminals  112  and second conducting terminals  113  of the first connection port  11  and the first conducting terminals  142  and second conducting terminals  143  of the second connection port  14  to the adapter board  21  of the circuit module  2 , the first contacts  211  and the second contacts  212  can be respectively arranged in two rows with 5 contacts at the top side and the other 4 contacts at the bottom side in a staggered manner. Alternatively, the second contacts  212  can be arranged in a rectangular array below the first contacts  211  wherein the signal terminals (D_, D+) of the second conducting terminals  113 ; 143  are downwardly arranged between the signal terminal (StdA_SSTX+) and signal grounding terminal of the first conducting terminals  112 ; 142 ; the power terminal (VBUS) and power grounding terminal (GND) of the second conducting terminals  113 ; 143  are downwardly arranged between the signal terminal (StdA_SSRX−) and signal grounding terminal of the first conducting terminals  112 ; 142 . Further, a power grounding terminal (DGND) may be respectively arranged blow the space between the signal terminals (StdA_SSTX−, StdA_SSTX+) of the first conducting terminals  112 ; 142 , and a power terminal (DPWR) may be respectively arranged blow the space between the signal terminals (StdA_SSRX−, StdA_SSRX+) of the first conducting terminals  112 ; 142 , The power grounding terminals (DGND) and the power terminals (DPWR) are respectively set in alignment between the signal terminals (D−, D+) of the second conducting terminals  113 ; 143 , or between the power terminal (VBUS) and the power grounding terminal (GND). Other equivalent alternations may be adopted to meet USB 3.0 standards without departing from the spirit and scope of the invention. 
     Referring to  FIGS. 1˜3  again, further, the tongue plate  111  of the first connection port  11  of the connector body  1  comprises a receiving chamber  116  located on the rear side thereof for accommodating the circuit module  2 , and two lugs  117  respectively vertically disposed at the two opposite lateral sides of the receiving chamber  116 . Each lug  117  has a locating groove  1171  located on the bottom side thereof. The bottom positioning member  12  further comprises a stop block  125  protruded from the top wall thereof at a rear side relative to the terminal slots  123 , and two limiter grooves  126  respectively located on the two opposite lateral sidewalls thereof at the rear side. Further, the connector body  1  further comprises a rear cover  15  located on the rear side of the first connection port  11  above the electrically insulative base member  12 . The rear cover  15  defines an open space  151  that is surrounded by the top wall, back wall and two opposing sidewalls of the rear cover  15 , having a plurality of locating flanges  153  respectively from the front side and bottom sides thereof around the open space  151  and respectively engaged into the receiving chamber  116  and the locating grooves  1171  of the lugs  117  and a locating block  152  located on the bottom side of the back wall thereof and stopped against the front side of the stop block  125 . Thus, the rear cover  15  is firmly secured to the first connection port  11  and the bottom positioning member  12  to shield the rear bonding portions  1122 ; 1232  of the first conducting terminals  112  and second conducting terminals  113  of the first connection port  11 , the adapter terminals  124  and the circuit module  2 . 
     Referring to  FIGS. 5˜7  again, as stated above, the connector body  1  consists of the first connection port  11 , the bottom positioning member  12 , the insulative base member  13 , the second connection port  14  and the rear cover  15 . Further, the connection block  3  comprises a stop block  34  protruded from the top wall thereof at a rear side relative to the terminal slots  31  for stopping against the rear cover  15 , two locating grooves  35  respectively located on the two opposite lateral sidewalls thereof. When the respective locating flanges  153  of the rear cover  15  are respectively engaged into the receiving chamber  116  and the locating grooves  1171  of the lugs  117 , the bottom-sided locating flanges  153  of the rear cover  15  are respectively engaged into the locating grooves  35  of the connection block  3 , enhancing positioning stability of the rear cover  15  so that the rear cover  15  effectively shields the rear bonding portions  1122 ; 1232  of the first conducting terminals  112  and second conducting terminals  113  of the first connection port  11 , the adapter terminals  124  and the circuit module  2  and prohibit them from contacting the metal shield  4  to cause a short circuit. 
     While only certain embodiments of the present invention have been described in detail for purposes of illustration various modifications and enhancements may be made thereunto without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.