Patent Publication Number: US-2023163538-A1

Title: Connector device

Description:
TECHNICAL FIELD 
     The present disclosure relates to a connector device. 
     BACKGROUND 
     Patent Document 1 discloses a connector device configured to connect a first connector and a second connector facing each other via an adapter. The adapter is relatively rockably connected to the first and second connectors. The first and second connectors can be respectively mounted on a first circuit board and a second circuit board. When the first and second circuit boards are shifted in position in a direction intersecting a facing direction, the adapter is inclined to accommodate position shifts of the first and second circuit boards. 
     PRIOR ART DOCUMENT 
     Patent Document 
     Patent Document 1: U.S. Pat. No. 4,925,403 
     SUMMARY OF THE INVENTION 
     Problems to be Solved 
     The first connector includes a first inner conductor to be mounted on the first circuit board and the second connector includes a second inner conductor to be mounted on the second circuit board. The adapter includes a movable-side inner conductor, and both end parts of the movable-side inner conductor are connected to the first and second inner conductors while being externally fit to the first and second inner conductors. Since the movable-side inner conductor is shaped to surround the first and second inner conductors, an outer diameter of the movable-side inner conductor is larger than those of the first and second inner conductors. A variation in the outer diameters of these inner conductors degrades transmission characteristics. 
     A connector device of the present disclosure was completed on the basis of the above situation and the present disclosure aims to improve transmission characteristics. 
     Means to Solve the Problem 
     The present disclosure is directed to a connector device with a mounting terminal including a mounting-side inner conductor, the mounting terminal being mounted on a circuit board, and an elongated movable terminal including a movable-side inner conductor, the movable terminal being arranged between the mounting terminal and a mating terminal, the mounting-side inner conductor including a mounting portion to be connected to the circuit board and a mounting-side connecting portion extending from the mounting portion toward the movable terminal, the movable-side inner conductor including a movable-side connecting portion to be connected to the mounting-side connecting portion while being fit to the mounting-side connecting portion in a length direction of the movable terminal and a shaft-like body portion extending from the movable-side connecting portion toward the mating terminal, and an outer diameter of the body portion and an outer diameter of the mounting portion being set equal. 
     Effect of the Invention 
     According to the present disclosure, it is possible to improve transmission characteristics. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a perspective view of a connector device of one embodiment. 
         FIG.  2    is an exploded perspective view of the connector device. 
         FIG.  3    is a front view in section of the connector device. 
         FIG.  4    is a side view in section of the connector device. 
         FIG.  5    is a perspective view of a movable terminal. 
         FIG.  6    is a perspective view of a first terminal. 
         FIG.  7    is an exploded perspective view of the first terminal. 
         FIG.  8    is a partial enlarged front view in section showing a connection structure of the first terminal and the movable terminal. 
     
    
    
     DETAILED DESCRIPTION TO EXECUTE THE INVENTION 
     Description of Embodiments of Present Disclosure 
     First, embodiments of the present disclosure are listed and described. 
     (1) The connector device of the present disclosure is provided with a mounting terminal including a mounting-side inner conductor, the mounting terminal being mounted on a circuit board, and an elongated movable terminal including a movable-side inner conductor, the movable terminal being arranged between the mounting terminal and a mating terminal, the mounting-side inner conductor including a mounting portion to be connected to the circuit board and a mounting-side connecting portion extending from the mounting portion toward the movable terminal, the movable-side inner conductor including a movable-side connecting portion to be connected to the mounting-side connecting portion while being fit to the mounting-side connecting portion in a length direction of the movable terminal and a shaft-like body portion extending from the movable-side connecting portion toward the mating terminal, and an outer diameter of the body portion and an outer diameter of the mounting portion being set equal. 
     To improve transmission characteristics in a transmission path from the elongated movable terminal to the circuit board via the mounting terminal, an impedance of the mounting terminal and that of the movable terminal are desirably matched. However, in a connected part in which the movable-side connecting portion and the mounting-side connecting portion are fit in the length direction of the movable terminal, an outer diameter becomes larger than in other parts. Thus, there is a concern for impedance mismatching. Accordingly, in the connector device of the present disclosure, the outer diameter of the mounting portion near the circuit board is set equal to the outer diameter of the shaft-like body portion of the movable terminal. According to this dimensioning, an impedance near the circuit board can be matched with an impedance of the transmission path constituted by the elongated movable terminal. In this way, the transmission characteristics can be improved on the whole in the transmission path from the elongated movable terminal to the circuit board via the mounting-side terminal. 
     (2) Preferably, a length of the body portion is larger than that of the mounting-side inner conductor. According to this configuration, a length of the connected part of the movable-side connecting portion and the mounting-side connecting portion, i.e. a length of a region of impedance mismatching, is shorter than the length of the body portion, wherefore the transmission characteristics can be improved on the whole. 
     (3) Preferably, the movable-side connecting portion is connected while being accommodated in the mounting-side connecting portion, and an outer diameter of the movable-side connecting portion is set smaller than that of the body portion. According to this configuration, since the outer diameter of the mounting-side connecting portion can be suppressed to be small and a difference between an impedance in the connected part of the movable-side connecting portion and the mounting-side connecting portion and an impedance in the body portion and the mounting portion can be reduced, the transmission characteristics can be improved on the whole. 
     (4) Preferably, the mounting portion is fixed to the circuit board by solder, the mounting terminal includes a tubular mounting-side dielectric for accommodating the mounting-side inner conductor, and a clearance is provided between an end part of an inner peripheral surface of the mounting-side dielectric on the side of the circuit board and an end part of an outer peripheral surface of the mounting portion on the side of the circuit board. According to this configuration, the solder in a molten state can be prevented from intruding into a gap between the inner peripheral surface of the mounting-side dielectric and the outer peripheral surface of the mounting portion by a capillary phenomenon. 
     (5) Preferably, the movable terminal includes a movable-side dielectric surrounding the movable-side inner conductor and a movable-side outer conductor surrounding the movable-side dielectric, and an end part of the movable-side dielectric on the side of the mounting terminal projects further toward the mounting-side connecting portion than an end part of the movable-side outer conductor. According to this configuration, the interference of the movable-side outer conductor with the mounting-side connecting portion can be prevented when the movable terminal is assembled with the mounting terminal. 
     Details of Embodiment of Present Disclosure 
     Embodiment 
     One specific embodiment of a connector device of the present disclosure is described below with reference to  FIGS.  1  to  8   . Note that the present invention is not limited to these illustrations and is intended to be represented by claims and include all changes in the scope of claims and in the meaning and scope of equivalents. In this embodiment, an oblique right lower side in  FIGS.  1  and  2    is defined as a front side concerning a front-rear direction. Upper and lower sides shown in  FIGS.  1  to  8    are directly defined as upper and lower sides concerning a vertical direction. An oblique left lower side in  FIGS.  1  and  2    is defined as a left side concerning a lateral direction. 
     The connector device of this embodiment includes, as shown in  FIGS.  1  and  2   , a first connector  10 , a second connector  40  and movable terminals  50 . As shown in  FIGS.  3  and  4   , the first connector  10  is mounted on a first circuit board A, and the second connector  40  is mounted on a second circuit board B. 
     The first circuit board A is, for example, provided in an ECU (not shown) mounted in a roof of an automotive vehicle, and horizontally arranged with a mounting surface facing up, i.e. facing toward the side of an antenna (not shown). The second circuit board B is, for example, provided in the antenna (not shown) to be mounted in the roof (not shown) of the automotive vehicle. The second circuit board B is horizontally arranged with a mounting surface facing down, i.e. facing toward a vehicle interior side. The first and second circuit boards A, B are arranged in such a positional relationship that the mounting surfaces of the both are facing in parallel to each other. 
     If the first and second circuit boards A, B are brought closer, the both circuit boards A, B are connected via the first connector  10 , the second connector  40  and the movable terminals  50 . Since the first and second circuit boards A, B are connected without via a wiring harness, high-speed communication is possible between the first and second circuit boards A, B. Since assembly tolerances of the roof and the antenna are relatively large in an antenna mounted part in the roof of the automotive vehicle, position shifts possibly occur between the first and second circuit boards A, B in a horizontal direction intersecting a connecting direction of the both connectors  10 ,  40 . The connector device of this embodiment is configured such that the both connectors  10 ,  40  are connected while the position shifts of the both circuit boards A, B are accommodated by rocking movements of the movable terminals  50 . 
     As shown in  FIGS.  2  and  3   , the first connector  10  includes a first housing  11  and a plurality of first terminals  15 . With the first connector  10  mounted on the first circuit board A, the lower surface of the first housing  11  is fixed to the first circuit board A and lower end parts of the plurality of first terminals  15  are connected to a printed circuit (not shown) of the first circuit board A. The first terminals  15  function as mounting terminals to be mounted on the first circuit board A. 
     The first housing  11  is a single component made of synthetic resin and having a rectangular parallelepiped shape. The first housing  11  is formed with as many first terminal accommodation chambers  12  as the first terminals  15 . The first terminal accommodation chambers  12  vertically penetrate through the first housing  11 . In a plan view of the first housing  11 , the first terminal accommodation chambers  12  are circular. The plurality of first terminal accommodation chambers  12  are divided into two left and right rows, and three chambers are arranged to be aligned in a row in the front-rear direction in each row. 
     The plurality of first terminals  15  are individually accommodated in the plurality of first terminal accommodation chambers  12 . As shown in  FIGS.  6  and  7   , the first terminal  15  includes a first inner conductor  16 , a first dielectric  25  and a first outer conductor  30 . The first inner conductor  16  is a single component having a tubular shape with an axis oriented in the vertical direction orthogonal to the first circuit board A and including a mounting portion  17  and a first connecting portion  20 . The first inner conductor  16  functions as a mounting-side inner conductor to be mounted on the first circuit board A. The mounting portion  17  includes a hollow cylindrical portion  18  and a leg portion  19  projecting toward the first circuit board A from the lower end edge of the hollow cylindrical portion  18 . The leg portion  19  is in the form of a plate bent into an L shape. 
     The first connecting portion  20  is a part functioning as a mounting-side connecting portion to be connected to the movable terminal. The first connecting portion  20  includes a hollow cylindrical supporting portion  21 , a tapered portion  22  having a truncated conical shape and linking the lower end edge of the supporting portion  21  and the upper end edge of the hollow cylindrical portion  18 , and a plurality of resilient contact pieces  23  cantilevered upward (toward the second circuit board B) from the upper end edge of the supporting portion  21 . As shown in  FIG.  8   , an outer diameter Db of the supporting portion  21  is larger than an outer diameter Da of the hollow cylindrical portion  18 . The plurality of resilient contact pieces  23  are point-symmetrically arranged at intervals in a circumferential direction. A positioning protrusion  24  is formed on the outer peripheral surface of the supporting portion  21 . 
     The first dielectric  25  is a member made of synthetic resin and having a hollow cylindrical shape with an axis oriented in the vertical direction. The first dielectric  25  functions as a mounting-side dielectric surrounding the mounting-side inner conductor. The supporting portion  21 , the tapered portion  22  and the hollow cylindrical portion  18  of the first inner conductor  16  are accommodated in a center hole  26  of the first dielectric  25 , and the positioning protrusion  24  is press-fit into a groove portion  27  of the center hole  26 . The resilient contact pieces  23  of the first inner conductor  16  project upward from the upper end surface of the first dielectric  25 . An arcuate projection  28  having an arched shape concentric with the first dielectric  25  is formed on the lower end surface (surface facing the first circuit board A) of the first dielectric  25 . The arcuate projection  28  surrounds the leg portion  19  projecting from the lower end surface of the first dielectric  25 . A clearance  29  is secured between the leg portion  19  and the inner peripheral surface of the arcuate projection  28 . 
     The first outer conductor  30  is a single component made of metal and in the form of an angular tube having a polygonal shape. The first outer conductor  30  functions as a mounting-side outer conductor surrounding the mounting-side dielectric (first dielectric  25 ). A plurality of resilient arms  31  divided in the circumferential direction are formed in an upper end side region of the first outer conductor  30 . A projection-like press-fit portion  32  is formed on the outer peripheral surface of the first outer conductor  30 . A projecting portion  33  is formed on the inner peripheral surface of the first outer conductor  30 . The first outer conductor  30  surrounds the first dielectric  25 . As shown in  FIG.  3   , the projecting portion  33  bites into an outer peripheral part of the first dielectric  25 , whereby the first outer conductor  30  and the first dielectric  25  are held in an assembled state. By assembling the first inner conductor  16  and the first dielectric  25  and assembling the first dielectric  25  and the first outer conductor  30 , the first terminal  15  is configured. 
     As shown in  FIG.  8   , with the first terminal  15  accommodated in the first terminal accommodation chamber  12 , the press-fit portion  32  is press-fit into an inner peripheral part of the first terminal accommodation chamber  12 , whereby the first terminal  15  is held in a state assembled with the first housing  11 . The first dielectric  25  is arranged in a lower end part of the first terminal accommodation chamber  12  and the resilient arms  31  project upward along the inner peripheral surface of the first terminal accommodation chamber  12 . The plurality of resilient contact pieces  23  projecting upward from the upper end surface of the first dielectric  25  are surrounded by the plurality of resilient arms  31 . 
     By accommodating the first terminals  15  into the first terminal accommodation chambers  12 , the first connector  10  is configured. The first connector  10  is mounted on the first circuit board A. In mounting the first connector  10 , the L-shaped leg portions  19  formed in the mounting portions  17  of the first inner conductors  16  are conductively welded to the mounting surface of the first circuit board A by solder S. The lower end parts of the first outer conductors  30  are also fixed to the mounting surface of the first circuit board A by the solder S. Further, the arcuate projections  28  projecting from the lower end surfaces of the first dielectrics  25  come into contact with the mounting surface of the first circuit board A, but the clearances  29  are secured over the entire peripheries of the leg portions  19  between the inner peripheral surfaces of the arcuate projections  28  and the leg portions  19 . Therefore, there is no possibility that the solder S in contact with the leg portions  19  in a molten state intrudes into gaps between the arcuate projections  28  and the leg portions  19  by a capillary phenomenon. 
     As shown in  FIGS.  3  and  4   , the second connector  40  includes a second housing  41  and as many second terminals  45  as the first terminals  15 . With the second connector  40  mounted on the second circuit board B, the upper surface of the second housing  41  is fixed to the mounting surface of the second circuit board B and upper end parts of a plurality of the second terminals  45  are connected to a printed circuit (not shown) of the second circuit board B. The second housing  41  is a single component made of synthetic resin and including a terminal holding portion  42  having a rectangular parallelepiped shape and a rectangular guiding portion  44 . The terminal holding portion  42  is formed with a plurality of (six in this embodiment) second terminal accommodation chambers  43  vertically penetrating through the terminal holding portion  42 . The second terminal accommodation chambers  43  are obtained by vertically inverting the first terminal accommodation chambers  12 . 
     The plurality of second terminals  45  are individually accommodated in the plurality of second terminal accommodation chambers  43 . The second terminal  45  is the same component as the first terminal  15  and mounted in the second terminal accommodation chamber  43  in an orientation vertically inverted from that of the first terminal  15 . The guiding portion  44  projects obliquely downward in a skirt-like manner from the outer peripheral edge of the lower end of the terminal holding portion  42 . The guiding portion  44  is inclined to become wider toward the bottom with respect to the connecting direction of the both connectors  10 ,  40 . An internal space of the guiding portion  44  communicates with the plurality of second terminal accommodation chambers  43  and is open downward of the second housing  41 . The second connector  40  is mounted on the mounting surface of the second circuit board B in a manner similar to a mounting mode of the first connector  10  on the first circuit board A. 
     As shown in  FIGS.  2  to  5   , the movable terminal  50  has an elongated shape with an axis oriented in the vertical direction (facing direction of the first and second circuit boards A, B) as a whole. Both end parts in an axial direction of the movable terminal  50  have such symmetry as to have the same shape when the movable terminal  50  is inverted. As shown in  FIGS.  3  and  4   , the movable terminal  50  is a member configured by assembling a movable-side inner conductor  51 , a movable-side dielectric  55  and a movable-side outer conductor  58 . 
     The movable-side inner conductor  51  is a metal member having a tubular shape elongated in the axial direction of the movable terminal  50 . The movable-side inner conductor  51  is a single component including a hollow cylindrical body portion  52  and a pair of vertically symmetrical movable-side connecting portions  54 . As shown in  FIG.  8   , an outer diameter Dc of the body portion  52  is equal to the outer diameter Da of the hollow cylindrical portion  18  of the first inner conductor  16 . A retaining projection  53  is formed on the outer peripheral surface of the body portion  52 . The upper movable-side connecting portion  54  projects upward coaxially with the body portion  52  from the upper end of the body portion  52 , and the lower movable-side connecting portion  54  projects downward coaxially with the body portion  52  from the lower end of the body portion  52 . An outer diameter De of the movable-side connecting portion  54  is smaller than the outer diameter Dc of the body portion  52  and the outer diameter Da of the hollow cylindrical portion  18 . A length in the axial direction of the movable-side connecting portion  54  is shorter than that of the body portion  52 . 
     The movable-side dielectric  55  has a hollow cylindrical shape coaxial with the movable-side inner conductor  51 . The movable-side inner conductor  51  is coaxially accommodated in an insertion hole  56  of the movable-side dielectric  55 . The retaining projection  53  bites into an inner peripheral part of the insertion hole  56 , whereby the movable-side inner conductor  51  and the movable-side dielectric  55  are integrally assembled. Circular accommodation recesses  57  are formed in both end parts in the axial direction of the movable-side dielectric  55  by coaxially recessing both upper and lower end surfaces of the movable-side dielectric  55 . The accommodation recesses  57  communicate with the insertion hole  56 . The movable-side connecting portions  54  are accommodated into the accommodation recesses  57 . 
     The movable-side outer conductor  58  has a hollow cylindrical shape as a whole. The movable-side outer conductor  58  is formed with a locking piece  59  cut and raised to project toward an inner peripheral side. The movable-side outer conductor  58  coaxially surrounds the movable-side dielectric  55 . The locking piece  59  bites into an outer peripheral part of the movable-side dielectric  55 , whereby the movable-side outer conductor  58  and the movable-side dielectric  55  are integrated. A lower end part of the movable-side dielectric  55  projects further downward than the lower end of the movable-side outer conductor  58 , and an upper end part of the movable-side dielectric  55  projects further upward than the upper end of the movable-side outer conductor  58 . The movable terminal  50  is configured by assembling the movable-side inner conductor  51 , the movable-side dielectric  55  and the movable-side outer conductor  58 . 
     A lower end part (one end part) of the movable terminal  50  is inserted into the first terminal accommodation chamber  12  and mounted in the first terminal  15 . At this time, since the lower end part of the movable-side dielectric  55  projects further downward than the lower end of the movable-side outer conductor  58 , it is possible to prevent the interference of the movable-side outer conductor  58  with the upper surface of the first housing  11  and the interference of the movable-side outer conductor  58  with the upper end part of the first inner conductor  16 . 
     With the movable terminal  50  mounted in the first terminal  15 , the resilient arms  31  of the first outer conductor  30  resiliently contact the outer peripheral surface of the movable-side outer conductor  58 . In the accommodation recess  57  of the movable terminal  50 , the resilient contact pieces  23  of the first inner conductor  16  surround the movable-side inner conductor  51  and resiliently contact the outer peripheral surface of the movable-side inner conductor  51 . The movable terminal  50  is rockable in the front-rear direction and lateral direction with the first terminal  15  as a fulcrum. 
     The movable terminal  50  mounted in the first terminal  15  projects further upward than the upper end surface of the first housing  11 . The upper end part of the movable terminal  50  is connected to the second terminal  45 , which is a mating terminal. Since one movable terminal  50  is supported in contact with only one first terminal  15 , there is a concern that the plurality of movable terminals  50  individually rock in directions different from the other movable terminals  15 . As a countermeasure against this, the plurality of movable terminals  50  are made integrally rockable by being passed through holding holes  61  of an alignment member  60  as shown in  FIG.  3   . 
     After the movable terminals  50  are mounted into the first connector  10 , the first and second circuit boards A, B are brought closer to connect the upper end parts of the movable terminals  50  to the second connector  40 . The movable terminals  50  and the second connector  40  are connected in a manner similar to the connection of the movable terminals  50  and the first connector  10 . Transmission paths are configured by the first terminals  15 , the movable terminals  50  and the second terminals  45  between the first and second circuit boards A, B. To improve transmission characteristics of these transmission paths, overall impedance matching of the transmission paths is necessary. 
     In the connector device of this embodiment, the outer diameter Dc of the body portion  52  of the movable-side inner conductor  51 , the outer diameter Da of the hollow cylindrical portion  18  of the first inner conductor  16  and an outer diameter Da (see  FIG.  3   ) of a hollow cylindrical portion  18  of a second inner conductor  46  are set equal as shown in  FIGS.  3  and  8    as a means for enhancing impedance matching. As shown in  FIGS.  3  and  4   , a length in the axial direction of the body portion  52  accounts for ⅓ of a length of the transmission path between the both circuit boards A and B. Further, the hollow cylindrical portion  18  of the first inner conductor  16  is shorter in axial length than the body portion  52 , but is arranged at a position closer to the first circuit board A than the body portion  52 . The hollow cylindrical portion  18  of the second inner conductor  46  is shorter in axial length than the body portion  52 , but is arranged at a position closer to the second circuit board B than the body portion  52 . Therefore, overall impedance matching of the transmission paths between the both circuit boards A and B is high and the transmission characteristics are high on the whole. 
     The connector device of this embodiment includes the first terminals  15  and the movable terminals  50 . The first terminal  15  includes the first inner conductor  16  and is mounted on the first circuit board A. The movable terminal  50  is an elongated member including the movable-side inner conductor  51 . The movable terminal  50  is arranged between the first terminal  15  serving as the mounting terminal and the second terminal  45  serving as the mating terminal. The first inner conductor  16  includes the mounting portion  17  to be connected to the first circuit board A and the first connecting portion  20  extending from the mounting portion  17  toward the movable terminal  50 . The movable-side inner conductor  51  includes the movable-side connecting portions  54  and the body portion  52 . The movable-side connecting portion  54  is fit into the first connecting portion  20  in a length direction of the movable terminal  50  and connected with peripheral surfaces radially facing each other. The body portion  52  is shaft-like and elongated from the movable-side connecting portion  54  toward the second terminal  45 . The outer diameter Dc of the body portion  52  and the outer diameter Da of the hollow cylindrical portion  18  of the mounting portion  17  are set equal. 
     In the transmission path from the elongated movable terminal  50  to the first circuit board A via the first terminal  15 , an impedance of the first terminal  15  and that of the movable terminal  50  are desirably matched to improve transmission characteristics. However, in a connected part in which the movable-side connecting portion  54  is fit in the first connecting portion  20 , the movable-side connecting portion  54  and the first connecting portion  20  radially overlap and an outer diameter becomes larger than in other parts. Thus, there is a concern for impedance mismatching. 
     Accordingly, in this embodiment, the outer diameter Da of the mounting portion  17  (hollow cylindrical portion  18 ) near the first circuit board A is set equal to the outer diameter Dc of the shaft-like body portion  52 . According to this dimensioning, an impedance near the first circuit board A can be matched with an impedance of the transmission path constituted by the elongated movable terminal  50 . Thus, the transmission characteristics can be improved on the whole in the transmission path from the elongated movable terminal  50  to the first circuit board A via the first terminal  15 . 
     The length in the axial direction of the body portion  52  is set longer than that of the first inner conductor  16 . Most of the transmission path from the movable terminal  50  to the first circuit board A is constituted by the body portion  52 . Since a length of the connected part of the movable-side connecting portion  54  and the first connecting portion  20 , i.e. a length of a region of impedance mismatching, is shorter than the length in the axial direction of the body portion  52  and the entire length in the axial direction of the first inner conductor  16 , the degradation of the transmission characteristics is suppressed. 
     The movable-side connecting portion  54  is connected while being accommodated in the first connecting portion  20 . The outer diameter De of the movable-side connecting portion  54  is set smaller than the outer diameter Dc of the body portion  52 . According to this configuration, since the outer diameter of the first connecting portion  20  can be suppressed to be small and a difference between an impedance in the connected part of the movable-side connecting portion  54  and the first connecting portion  20  and an impedance in the body portion  52  and the mounting portion  17  can be reduced, the transmission characteristics can be improved on the whole. 
     The mounting portion  17  is fixed to the first circuit board A by the solder S. The first terminal  15  includes the tubular first dielectric  25  for accommodating the first inner conductor  16 . The arcuate projection  28  for surrounding an end part of the mounting portion  17  on the side of the first circuit board A is formed on an end part of the inner peripheral surface of the first dielectric  25  on the side of the first circuit board A. The clearance  29  is provided between the inner peripheral surface of the arcuate projection  28  and an end part of the outer peripheral surface of the mounting portion  17  on the side of the circuit board A. According to this configuration, even if the solder S in the molten state is in contact with the outer peripheral surface of the mounting portion  17  and the mounting surface of the first circuit board A, this solder S can be prevented from intruding into the gap between the inner peripheral surface of the first dielectric  25  and the outer peripheral surface of the mounting portion  17  by the capillary phenomenon. 
     The movable terminal  50  includes the movable-side dielectric  55  surrounding the movable-side inner conductor  51  and the movable-side outer conductor  58  surrounding the movable-side dielectric  55 . An end part of the movable-side dielectric  55  on the side of the first terminal  15  projects further toward the first connecting portion  20  than an end part of the movable-side outer conductor  58 . According to this configuration, when the movable terminal  50  is assembled with the first terminal  15 , the interference of the movable-side outer conductor  58  with the first connecting portion  20  of the first inner conductor  16  can be prevented. 
     Other Embodiments 
     The present invention is not limited by the above described and illustrated embodiment, but is represented by claims. The present invention is intended to include all changes in the scope of claims and in the meaning and scope of equivalents and also include the following embodiments. 
     Although the movable-side connecting portion is accommodated in the mounting-side connecting portion in the above embodiment, the mounting-side connecting portion may be accommodated in the movable-side connecting portion. 
     Although the mounting-side connecting portion resiliently contacts the movable-side connecting portion in the above embodiment, the movable-side connecting portion may resiliently contact the mounting-side connecting portion. 
     Although the movable-side dielectric projects further toward the mounting-side connecting portion than the movable-side outer conductor in the above embodiment, the movable-side outer conductor may project further toward the mounting-side connecting portion than the movable-side dielectric. 
     LIST OF REFERENCE NUMERALS 
     A . . . first circuit board (circuit board) 
     B . . . second circuit board (circuit board) 
     Da . . . outer diameter of hollow cylindrical portion (mounting portion) 
     Db . . . outer diameter of supporting portion 
     Dc . . . outer diameter of body portion 
     De . . . outer diameter of movable-side connecting portion 
     S . . . solder 
       10  . . . first connector 
       11  . . . first housing (housing) 
       12  . . . first terminal accommodation chamber 
       15  . . . first terminal (mounting terminal) 
       16  . . . first inner conductor (mounting-side inner conductor) 
       17  . . . mounting portion (mounting-side connecting portion) 
       18  . . . hollow cylindrical portion 
       19  . . . leg portion 
       20  . . . first connecting portion 
       21  . . . supporting portion 
       22  . . . tapered portion 
       23  . . . resilient contact piece 
       24  . . . positioning protrusion 
       25  . . . first dielectric (mounting-side dielectric) 
       26  . . . center hole 
       27  . . . groove portion 
       28  . . . arcuate projection 
       29  . . . clearance 
       30  . . . first outer conductor 
       31  . . . resilient arm 
       32  . . . press-fit portion 
       33  . . . projecting portion 
       40  . . . second connector 
       41  . . . second housing 
       42  . . . terminal holding portion 
       43  . . . second terminal accommodation chamber 
       44  . . . guiding portion 
       45  . . . second terminal (mating terminal) 
       46  . . . second inner conductor 
       50  . . . movable terminal 
       51  . . . movable-side inner conductor 
       52  . . . body portion 
       53  . . . retaining projection 
       54  . . . movable-side connecting portion 
       55  . . . movable-side dielectric 
       56  . . . insertion hole 
       57  . . . accommodation recess 
       58  . . . movable-side outer conductor 
       59  . . . locking piece 
       60  . . . alignment member 
       61  . . . holding hole