Abstract:
A terminal holder structure installed in a RJ45 dual-port jack is disclosed to include a plastic intermediate bracket mounted on a middle part of a circuit board to hold the 3 rd  and 5 th  terminals of a first set of terminals numbered from 1 st  through 8 th  and the 3 rd  and 5 th  terminals of a second set of terminals numbered from 1 st  through 8 th  in reversed directions so that the distance&#39; between the 3 rd  and 5 th  terminals of the first set of terminals and the 3 rd  and 5 th  terminals of the second set of terminals is extended for crosstalk compensation to avoid crosstalk interference in the RJ45 dual-port jack.

Description:
BACKGROUND AND SUMMARY OF THE INVENTION 
     The present invention relates to RJ45 dual-port jack technology and more particularly, to a terminal holder structure for RJ45 dual-port jack has an intermediate bracket arranged on the middle part of the top wall of the circuit board thereof to hold the 3 rd  and 5 th  terminals of the first and second sets of terminals in a back to back manner so that the distance between the 3 rd  and 5 th  terminals of the first set of terminals and the 3 rd  and 5 th  terminals of the second set of terminals is sufficient for crosstalk compensation, avoiding crosstalk interference and improving communication quality. 
     A conventional RJ45 dual-port jack, as shown in  FIG. 1 , generally comprises an insulative housing (not shown) and a terminal holder structure A mounted in the housing. The terminal holder structure A comprises a circuit board B, a first set of terminals  81 ,  82 ,  83 ,  84 ,  85 ,  86 ,  87 ,  88  numbered from 1 st  through 8 th , a second set of terminals  91 ,  92 ,  93 ,  94 ,  95 ,  96 ,  97 ,  98  numbered from 1 st  through 8 th , a first bracket  80 , and a second bracket  90 . The first set of terminals  81 ,  82 ,  83 ,  84 ,  85 ,  86 ,  87 ,  88  is mounted at the first bracket  80  and then installed with the first bracket  80  in the front side of the circuit board B. The second set of terminals  91 ,  92 ,  93 ,  94 ,  95 ,  96 ,  97 ,  98  is mounted at the second bracket  90  and then installed with the second bracket  90  in the rear side of the circuit board B. However, in the aforesaid design, the distance D between the two sets of third and fifth terminals  83 , 85 ;  93 , 95  (see  FIGS. 2 and 3 ) is too short, or about 1.85 mm (RJ45 Center 2 Pair 3/5 Pin distance 1.85/mm) not sufficient for crosstalk compensation, causing a phase delay and inductive effects of metal wiring. In consequence, a serious crosstalk will occur across the area around the two sets of third and fifth terminals  83 , 85 ;  93 , 95  (RJ45 Center Pair 3/5 Pin). 
     The present invention has been accomplished under the circumstances in view. It is therefore the main object of the present invention to provide a terminal holder structure for RJ45 dual-port jack, which enables the distance between the 3 rd  and 5 th  terminals of the first set of terminals and the 3 rd  and 5 th  terminals of the second set of terminals be extended for crosstalk compensation, avoiding crosstalk interference and improving communication quality. 
     To achieve this and other objects of the present invention, a terminal holder structure is installed in an electrically insulative housing of a RJ45 dual-port jack, comprising a circuit board, a first set of terminals numbered from 1 st  through 8 th , a second set of terminals numbered from 1 st  through 8 th , at least one first bracket located on the circuit board at a front side and holding the 1 st , 2 nd , 4 th , 6 th , 7 th  and 8 th  terminals of the first set of terminals in a parallel manner, and at least one second bracket located on the circuit board at a rear side and holding the 1 st , 2 nd , 4 th , 6 th , 7 th  and 8 th  terminals of the second set of terminals in a parallel manner, wherein the terminal holder structure further comprises at least one plastic intermediate bracket arranged at a middle part of the circuit board between the at least one first bracket and the at least one second bracket to hold the 3 rd  and 5 th  terminals of the first set of terminals and the 3 rd  and 5 th  terminals of the second set of terminals in reversed directions so that the distance&#39; between the 3 rd  and 5 th  terminals of the first set of terminals and the 3 rd  and 5 th  terminals of the second set of terminals is extended for crosstalk compensation to avoid crosstalk interference in the RJ45 dual-port jack; the 3 rd  and 5 th  terminals of the first set of terminals are arranged to face toward a front side of the circuit board so that respective front contact portions of the 3 rd  and 5 th  terminals of the first set of terminals are respectively suspending between respective front contact portions of the 4 th  and 6 th  terminals of the first set of terminals; the 3 rd  and 5 th  terminals of the second set of terminals are arranged to face toward a rear side of the circuit board so that respective front contact portions of the 3 rd  and 5 th  terminals of the second set of terminals are respectively suspending between respective front contact portions of the 4 th  and 6 th  terminals of the second set of terminals. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
         FIG. 1  is an elevational view of a terminal holder structure for RJ45 dual-port jack according to the prior art. 
         FIG. 2  is a schematic top plain view of the prior art design, illustrating the arrangement of the 3rd and 5 th  terminals of the first and second sets of terminals. 
         FIG. 3  is a schematic side plain view of the prior art design, illustrating the distance between the 3rd and 5 th  terminals of the first and second sets of terminals. 
         FIG. 4  is an exploded view of a terminal holder structure for RJ45 dual-port jack in accordance with a first embodiment of the present invention. 
         FIG. 5  corresponds to  FIG. 4  when viewed from another angle. 
         FIG. 6  is an elevational assembly view of  FIG. 4 . 
         FIG. 7  is an elevational view of a RJ45 dual-port jack constructed according to the present invention. 
         FIG. 8  is a schematic top plain view of the first embodiment of the present invention, illustrating the arrangement of the 3rd and 5 th  terminals of the first and second sets of terminals. 
         FIG. 9  is a schematic side plain view of the first embodiment of the present invention, illustrating the distance between the 3rd and 5 th  terminals of the first and second sets of terminals. 
         FIG. 10  is a schematic top view of a terminal holder structure for RJ45 dual-port jack in accordance with a second embodiment of the present invention. 
         FIG. 11  is a schematic top view of a terminal holder structure for RJ45 dual-port jack in accordance with a third embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to  FIGS. 4 through 9 , a terminal holder structure in accordance with a first embodiment is shown mounted in an electrically insulative housing  1  of a RJ45 dual-port jack (see  FIG. 7 ). The terminal holder structure comprises a circuit board  2 , a first set of terminals  31 ,  32 ,  33 ,  34 ,  35 ,  36 ,  37 ,  38  numbered from 1 st  through 8 th , a second set of terminals  41 ,  42 ,  43 ,  44 ,  45 ,  46 ,  47 ,  48  numbered from 1 st  through 8 th , at least one first bracket  5  located on the top wall of the circuit board  2  at a front side and holding the 1 st , 2 nd , 4 th , 6 th , 7 th  and 8 th  terminals of the first set of terminals  31 ,  32 ,  33 ,  34 ,  35 ,  36 ,  37 ,  38  in a parallel manner, and at least one second bracket  6  located on the top wall of the circuit board  2  at a rear side and holding the 1 st , 2 nd , 4 th , 6 th , 7 th  and 8 th  terminals of the second set of terminals  41 ,  42 ,  43 ,  44 ,  45 ,  46 ,  47 ,  48  in a parallel manner. 
     The main feature of the present invention is outlined hereinafter. 
     A plastic intermediate bracket  7  is arranged at the top wall of the circuit board  2  on the middle between the at least one first bracket  5  and the at least one second bracket  6 , holding the 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals  31 ,  32 ,  33 ,  34 ,  35 ,  36 ,  37 ,  38  in a spaced manner in the front side thereof and the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals  41 ,  42 ,  43 ,  44 ,  45 ,  46 ,  47 ,  48  in a spaced manner in the rear side thereof. Thus, the distance D′ between the 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals  31 ,  32 ,  33 ,  34 ,  35 ,  36 ,  37 ,  38  and the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals  41 ,  42 ,  43 ,  44 ,  45 ,  46 ,  47 ,  48  (see  FIGS. 8 and 9 ) is sufficient (about 5.94 mm) for crosstalk compensation, avoiding crosstalk interference and improving communication quality. 
     Further, the 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals  31 ,  32 ,  33 ,  34 ,  35 ,  36 ,  37 ,  38  are arranged to face toward the front side of the circuit board  2  so that the front contact portions  331  and  351  of the 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals  31 ,  32 ,  33 ,  34 ,  35 ,  36 ,  37 ,  38  are respectively suspending between the front contact portions  341  and  361  of the 4 th  and 6 th  terminals  34  and  36  of the first set of terminals  31 ,  32 ,  33 ,  34 ,  35 ,  36 ,  37 ,  38 . Further, the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals  41 - 48  are arranged to face toward the rear side of the circuit board  2  so that the front contact portions  431  and  451  of the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals  41 ,  42 ,  43 ,  44 ,  45 ,  46 ,  47 ,  48  are respectively suspending between the front contact portions  441  and  461  of the 4 th  and 6 th  terminals  44  and  46  of the second set of terminals  41 ,  42 ,  43 ,  44 ,  45 ,  46 ,  47 ,  48 . 
     Further, the circuit board  2  comprises four via holes  21 ,  22 ,  23  and  24  (see  FIGS. 4 and 5 ). The rear bonding portions  332  and  352  of the 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals  31 ,  32 ,  33 ,  34 ,  35 ,  36 ,  37 ,  38  and the rear bonding portions  432  and  452  of the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals  41 ,  42 ,  43 ,  44 ,  45 ,  46 ,  47 ,  48  are respectively electrically bonded to the via holes  21 ,  22 ,  23  and  24  of the circuit board  2 . 
     Further, the plastic intermediate bracket  7  comprises four terminal slots  71 ,  72 ,  73  and  74  arranged in two symmetrical pairs and cut through the top and bottom walls thereof. The 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals  31 - 18  and the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals  41 ,  42 ,  43 ,  44 ,  45 ,  46 ,  47 ,  48  are respectively inserted through the terminal slots  71 ,  72 ,  73  and  74  of the plastic intermediate bracket  7 . 
       FIG. 10  illustrates a terminal holder structure for RJ45 dual-port jack in accordance with a second embodiment of the present invention. This second embodiment is substantially similar to the aforesaid first embodiment with the exception that the plastic intermediate bracket  7  is formed of two intermediate sub brackets  70  that are abutted against each other, wherein one intermediate sub bracket  70  holds the 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals in a spaced manner and the other intermediate sub bracket  70  holds the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals in a spaced manner. Thus, the distance D′ between the 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals and the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals is sufficient for crosstalk compensation, avoiding crosstalk interference and improving communication quality. 
     Further, the 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals are arranged to face toward the front side of the circuit board  2  so that the front contact portions  331  and  351  of the 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals are respectively suspending between the front contact portions of the 4 th  and 6 th  terminals (not shown) of the first set of terminals. Further, the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals are arranged to face toward the rear side of the circuit board  2  so that the front contact portions  431  and  451  of the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals are respectively suspending between the front contact portions of the 4 th  and 6 th  terminals (not shown) of the second set of terminals. 
     Further, the circuit board  2  comprises four via holes (not shown). The rear bonding portions  332  and  352  of the 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals and the rear bonding portions  432  and  452  of the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals are respectively electrically bonded to the via holes of the circuit board  2 . 
     Further, the two intermediate sub brackets  70  of the plastic intermediate bracket  7  each comprise two terminal slots  71  and  72 ;  73  and  74  respectively cut through the top and bottom walls thereof. The 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals and the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals are respectively inserted through the terminal slots  71  and  72 ;  73  and  74  of the two intermediate sub brackets  70  of the plastic intermediate bracket  7 . 
       FIG. 11  illustrates a terminal holder structure for RJ45 dual-port jack in accordance with a third embodiment of the present invention. This third embodiment is substantially similar to the aforesaid first embodiment with the exception that two plastic intermediate brackets  7 ′ and  7 ″ are arranged on the middle part of the top wall of the circuit board  2  and kept apart at a distance, wherein one intermediate bracket  7 ′ holds the 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals in a spaced manner and the other intermediate bracket  7 ″ holds the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals in a spaced manner. Thus, the distance D′ between the 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals and the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals is sufficient for crosstalk compensation, avoiding crosstalk interference and improving communication quality. 
     Further, the 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals are arranged to face toward the front side of the circuit board  2  so that the front contact portions  331  and  351  of the 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals are respectively suspending between the front contact portions of the 4 th  and 6 th  terminals (not shown) of the first set of terminals. Further, the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals are arranged to face toward the rear side of the circuit board  2  so that the front contact portions  431  and  451  of the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals are respectively suspending between the front contact portions of the 4 th  and 6 th  terminals (not shown) of the second set of terminals. 
     Further, the circuit board  2  comprises four via holes (not shown). The rear bonding portions  332  and  352  of the 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals and the rear bonding portions  432  and  452  of the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals are respectively electrically bonded to the via holes of the circuit board  2 . 
     Further, the two intermediate brackets  7 ′ and  7 ″ each comprise two terminal slots  71 ′ and  72 ′;  73 ″ and  74 ″ respectively cut through the top and bottom walls thereof. The 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals and the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals are respectively inserted through the terminal slots  71 ′ and  72 ′;  73 ″ and  74 ″ of the two intermediate brackets  7 ′ and  7 ″. 
     In conclusion, the invention provides a terminal holder structure for RJ45 dual-port jack, which has the advantages and features as follows:
     1. The terminal holder structure for RJ45 dual-port jack has an intermediate bracket  7  arranged on the middle part of the top wall of the circuit board  2  thereof to hold the 3 rd  and 5 th  terminals  33  and  35 ;  43  and  45  of the first and second sets of terminals (2 Pair 3/5 Pin) in a back to back manner so that the distance D′ between the 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals  31 ,  32 ,  33 ,  34 ,  35 ,  36 ,  37 ,  38  and the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals  41 ,  42 ,  43 ,  44 ,  45 ,  46 ,  47 ,  48  (see  FIGS. 8 and 9 ) is sufficient (about 5.94 mm, which is much wider than the distance D of 1.85 mm in the prior art design shown in  FIG. 1 ) for crosstalk compensation, avoiding crosstalk interference and improving communication quality. When used in a 10G Ethernet network in the frequency range 1 MHz to 500 MHz, a different geometric position of metal can change the coupling phenomenon of surrounding metals, thereby indirectly affecting alteration of asymmetric phase retardation and increasing or decreasing of crosstalk vector in device crosstalk interference. In other words, the arrangement of the intermediate bracket  7  on the circuit board  2  can compensate for crosstalk loop space, effectively reducing crosstalk interference in the RJ45 dual-port jack.   2. The curved configuration of the 3 rd  and 5 th  terminals  33  and  35  of the first set of terminals  31 ,  32 ,  33 ,  34 ,  35 ,  36 ,  37 ,  38  and the 3 rd  and 5 th  terminals  43  and  45  of the second set of terminals  41 ,  42 ,  43 ,  44 ,  45 ,  46 ,  47 ,  48  that are supported on the intermediate bracket  7  facilitates interaction between metal wires to generate a capacitive effect.   

     Although particular embodiments of the invention have 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.