Abstract:
With a simple configuration, increase in size can be avoided, usage durability is improved, and occurrence of insufficient electrical connection caused by dust can be prevented well. A crank part is provided in at least one of both contacts including elastic beam-like members. Both of the contacts are provided with cut-away parts, which substantially increase the span lengths of the elastic beam-like members, and gaps between the contacts and an insulating housing which ensure flexibility of the elastic beam-like members to ensure flexibility and prevent permanent deformation of the contacts while enhancing elasticity of the contacts. Dust which has entered the interior thereof is moved along the crank part to ensure electrical conductivity well, which is an employed configuration.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a switch-equipped coaxial connector provided with a pair of contacts caused to be in a mutually-separated state when an opposing connector is mated. 
         [0003]    2. Description of Related Art 
         [0004]    Generally, a switch-equipped coaxial connector is used in an electronic device or an electric device such as a mobile phone. Such a switch-equipped coaxial connector is used as, for example, a small circuit test switch for testing the state or performance of various electronic circuits such as high-frequency circuits provided in the device. Each of circuit test switches disclosed in below-described Japanese Patent Application Laid-Open No. H09-245907, Japanese Patent Application Laid-Open No. 2002-359039, etc. is composed of a switch-equipped coaxial connector mounted on a circuit board so as to disconnect an electronic circuit of a main body of the device and is configured so that a probe (test needle) of a test plug connector serving as an opposing connector is inserted from the upper side toward the interior thereof through an opposing insertion hole provided in the switch-equipped coaxial connector. 
         [0005]    In such a switch-equipped coaxial connector, an electrically-conductive shell for ground connection is attached to the outer side of an insulating housing, and a plurality of board connecting parts integrally projected from the electrically-conductive shell are configured to be joined by soldering with electrically-conductive paths on an illustration-omitted wiring board so as to be mounted thereon and subjected to use. A contact pair composed of a movable contact and a fixed contact for signal transmission is attached to the interior of the insulating housing of this case, and the movable contact and the fixed contact of the pair are respectively connected to a first side and a second side of an electronic circuit (illustration omitted) provided on the main body of the device. 
         [0006]    A distal end of the probe (test needle) of the test plug connector, which has been inserted from the upper side, is brought into contact with the switch-equipped coaxial connector with a pressure so as to push and open a free-end part of the movable contact, which swings in an approximately horizontal plane, and, as a result, the movable contact swings and is separated from the fixed contact to disconnect the original electronic circuit. At the same time, the movable contact is brought into contact with a lower-end part of the probe; and, as a result, the probe becomes a state that the probe is conducted to another electronic circuit of the main body of the device so that, for example, an arbitrary test can be executed by outputting electric signals from the electronic circuit to the outside through the probe. 
         [0007]    However, such a conventional switch-equipped coaxial connector has a problem in usage durability since the contacts may be permanently deformed due to, for example, repeated insertion of the probe (test needle) of the test plug connector. A means that enhances elasticity by increasing the span of the contacts is conceivable in order to improve the usage durability. However, if the lengths of the contacts are simply increased, the size of the whole connector is increased, which goes against recent demands for downsizing and reduction in height. Also, there is a problem that minute debris or dust such as insulating matters present in a usage atmosphere may enter the interior through the insertion hole of the probe (test needle) of the test plug connector and cause insufficient electrical connection. 
       SUMMARY OF THE INVENTION 
       [0008]    Therefore, it is an object of the present invention to provide a switch-equipped coaxial connector so that, with a simple configuration, increase in the size thereof can be avoided, usage durability can be improved, and occurrence of insufficient electrical connection caused by dust that has entered the interior thereof can be prevented well. 
         [0009]    The present invention for achieving the above described object employs a configuration in which a switch-equipped coaxial connector has a pair of contacts disposed so as to be extended like cantilevers from fixing parts fixed with an insulating housing and be opposed to each other, the contacts disposed so that end parts of the pair of the contacts are in contact with each other, the switch-equipped coaxial connector configured so that pressing force of an opposing connector inserted through an insertion hole provided in the insulating housing moves a first-side contact of the pair of the contacts in a pressing direction and separates the first-side contact from a second-side contact of the pair of the contacts; wherein both of the pair of the contacts respectively have flexible elastic beam-like members extended like cantilevers from the fixing parts; the elastic beam-like member of at least the first-side contact of the pair of the contacts has a crank part bent toward an inserting direction of the opposing connector; in both of the contacts, cut-away parts that substantially increase span lengths of the elastic beam-like members are respectively formed at boundary parts between the fixing parts and the elastic beam-like members; and gaps that ensure flexibility of the elastic beam-like members are provided respectively between both of the contacts and the insulating housing. 
         [0010]    According to the switch-equipped coaxial connector having such a configuration, the crank part provided in at least the first-side contact and the cut-away parts provided on both of the contacts enhance elasticity of the contacts with respect to the pressing force of the opposing connector. The gaps provided between the contacts and the insulating housing ensure flexibility of both of the contacts, and permanent deformation of the contacts is prevented even when the size and height of the connector are reduced. Even when dust which has entered the interior thereof falls on the contacts through the opposing insertion hole, which is open when the opposing connector is not mated therewith, the dust is moved along the inclined surface of the crank part of the contact and is not accumulated on the contacts. The risk that electrical conductivity between the opposing connector and the contacts and the electrical conductivity mutually between the contacts are disturbed by the dust is reduced. 
         [0011]    It is desired that the fixing part of the present invention be extended in a direction in which the pair of contacts are opposed to each other and engaged with the insulating housing. 
         [0012]    According to the switch-equipped coaxial connector having such a configuration, the fixing parts provided in both of the contacts are fixed to the insulating housing in a state that the fixing parts are extended in the contact opposing direction. Therefore, supportability of the contacts with respect to the inserting direction of the opposing connector is improved, positional accuracy at electrical contact parts is improved, wobbling stability of the contacts is improved, and positional misalignment of the contacts is prevented with respect to the pressing force of the opposing connector and that mutually between the contacts. 
         [0013]    It is also desired that the cut-away part of the present invention be formed so as to form a groove shape at a coupling part between the fixing part and the elastic beam-like member. 
         [0014]    According to the switch-equipped coaxial connector having such a configuration, the substantial span length of the elastic beam-like member is increased by the length of the groove constituting the cut-away part. Therefore, elasticity of the elastic beam-like member is easily improved, the flexure supporting point of the elastic beam-like member is positioned in the length-direction range of the fixing part, and the retainability of the elastic beam-like member by the fixing part is improved. 
         [0015]    It is also desired that the crank part of the present invention be configured so as to be obliquely bent and extended from an intermediate position in an extending direction of the elastic beam-like member toward the inserting direction of the opposing connector and then obliquely bent toward a direction opposite to the inserting direction of the opposing connector; and a distal end part of the elastic beam-like member extended from the crank part be disposed so as to be brought into contact with the second-side contact from a direction opposite to the inserting direction of the opposing connector. 
         [0016]    According to the switch-equipped coaxial connector having such a configuration, the distal end part of the first-side contact is brought into contact with the second-side contact as if scooping-up the second-side contact, and the contact parts of both of the contacts are brought into contact with each other so as to be sliding contact upon insertion/detachment of the opposing connector. Therefore, the state of electrical connection is maintained well, and cleanliness at the contact parts is improved by a so-called wiping action mutually between the contacts. 
         [0017]    It is also desired that, in the elastic beam-like member of the first-side contact of the present invention, a through hole be formed at a part to be brought into contact with the opposing connector. 
         [0018]    According to the switch-equipped coaxial connector having such a configuration, dust such as debris which has fallen on the first-side contact is discharged to the outside through the through hole, the inner peripheral part of the through hole is brought into contact with the opposing connector from both sides of the diagonal-line direction of the through hole, and performance of contact between the opposing connector and the contact is improved. 
         [0019]    As described above, in the switch-equipped coaxial connector according to the present invention, both of the contacts extended like the cantilevers in the insulating housing are formed of the elastic beam-like members, the crank part is provided in at least the first-side contact, and both of the contacts are provided with the cut-away parts, which substantially increase the span lengths of the elastic beam-like members, and the gaps between the contacts and the insulating housing, which ensure flexibility of the elastic beam-like members; thereby employing a configuration in which: flexibility is ensured while enhancing elasticity of the contacts, permanent deformation of the contacts is prevented, the dust which has entered the interior thereof is moved along the crank part, electrical conductivity is ensured well. Therefore, with a simple configuration, increase in size can be avoided, usage durability can be improved, occurrence of insufficient electrical connection due to dust can be prevented well, and reliability of the switch-equipped coaxial connector can be significantly improved. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0020]      FIG. 1  is an external-appearance perspective explanatory drawing showing, from a front upper side, the overall structure of a switch-equipped coaxial connector constituting a circuit test switch according to an embodiment of the present invention; 
           [0021]      FIG. 2  is an external-appearance perspective explanatory drawing showing, from a front lower side, the overall structure of the switch-equipped coaxial connector according to the embodiment of the present invention shown in  FIG. 1 ; 
           [0022]      FIG. 3  is a plan explanatory drawing of the switch-equipped coaxial connector according to the embodiment of the present invention shown in  FIG. 1  and  FIG. 2 ; 
           [0023]      FIG. 4  is a front explanatory drawing of the switch-equipped coaxial connector according to the embodiment of the present invention shown in  FIG. 1  to  FIG. 3 ; 
           [0024]      FIG. 5  is a lateral-side explanatory drawing of the switch-equipped coaxial connector according to the embodiment of the present invention shown in  FIG. 1  to  FIG. 3 ; 
           [0025]      FIG. 6  is a back-side explanatory drawing of the switch-equipped coaxial connector according to the embodiment of the present invention shown in  FIG. 1  to  FIG. 3 ; 
           [0026]      FIG. 7  is an external-appearance perspective explanatory drawing showing, from a front upper side, a first-side contact used in the switch-equipped coaxial connector according to the embodiment of the present invention shown in  FIG. 1  to  FIG. 6 ; 
           [0027]      FIG. 8  is an explanatory-appearance perspective explanatory drawing showing, from a front upper side, a second-side contact used in the switch-equipped coaxial connector according to the embodiment of the present invention shown in  FIG. 1  to  FIG. 6 ; 
           [0028]      FIG. 9  is an external-appearance perspective explanatory drawing showing, from a front upper side, a disposing relation of both of the contacts used in the switch-equipped coaxial connector according to the embodiment of the present invention shown in  FIG. 1  to  FIG. 6 ; 
           [0029]      FIG. 10  is a vertical cross-sectional explanatory drawing taken along a line A-A of  FIG. 3 ; 
           [0030]      FIG. 11  is a vertical cross-sectional explanatory drawing which is a drawing corresponding to  FIG. 10  and showing a state immediately before insertion of an opposing connector (test plug connector); 
           [0031]      FIG. 12  is a vertical cross-sectional explanatory drawing showing a state in which the opposing connector (test plug connector) is inserted in the state of  FIG. 11 ; 
           [0032]      FIG. 13  is a plan explanatory drawing showing the structure of the second-side contact used in the switch-equipped coaxial connector according to the embodiment of the present invention shown in  FIG. 1  to  FIG. 12 ; 
           [0033]      FIG. 14  is a lateral-side explanatory drawing showing, from a lateral direction, the second-side contact shown in  FIG. 13 ; 
           [0034]      FIG. 15  is a partial vertical cross-sectional explanatory drawing showing a part B of  FIG. 10  in an enlarged manner; 
           [0035]      FIG. 16  is a plan explanatory drawing showing the structure of the first-side contact used in the switch-equipped coaxial connector according to the embodiment of the present invention shown in  FIG. 1  to  FIG. 12 ; 
           [0036]      FIG. 17  is a lateral-side explanatory drawing showing, from a lateral direction, the first-side contact shown in  FIG. 16 ; 
           [0037]      FIG. 18  is a partial vertical cross-sectional explanatory drawing showing a part C of  FIG. 12  in an enlarged manner; and 
           [0038]      FIG. 19  is a front explanatory drawing showing an attached state of the first-side contact shown in  FIG. 18  in an enlarged manner. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0039]    Hereinafter, an embodiment in which a switch-equipped coaxial connector according to the present invention is employed as a circuit test switch will be explained in detail based on drawings. 
       [About Overall Structure of Circuit Test Switch] 
       [0040]    The switch-equipped coaxial connector  10  according to a first embodiment of the present invention shown in  FIG. 1  to  FIG. 6  and  FIG. 10  to  FIG. 12  is mounted on a wiring board, of which illustration is omitted, and a test plug connector  20  (see  FIG. 11  and  FIG. 12 ) serving as an opposing connector is configured to be mated with the switch-equipped coaxial connector  10  from the upper side or removed therefrom toward the upper side. More specifically, the test plug connector  20  disposed in the upper side of the switch-equipped coaxial connector  10  is thrust into the switch-equipped coaxial connector  10  in the lower side with appropriate force while being held by hands of an operator, and an attached state that both of the connectors are mated with each other is obtained as a result. When the test plug connector  20  is held in the attached state of both of the connectors and pulled up to the upper side with appropriate force, the test plug connector is detached upward from the switch-equipped coaxial connector  10  to carry out removal. The test plug connector  20  is not limited to be inserted/removed by the hands of the operator, but may be automatically inserted/removed by a machine. Hereinafter, the inserting direction and the removing direction of the test plug connector will be referred to as “downward direction” and “upward direction”. 
         [0041]    The switch-equipped coaxial connector  10 , which constitutes an assembly of such a circuit test switch, is used by, for example, being mounted by soldering on an electronic circuit board (illustration omitted) provided on an electronic device such as a mobile phone. The connector  10  is disposed so as to disconnect or connect an electronic circuit, which is provided on the electronic device, to, for example, a main body side of the device and an antenna side. 
       [About Configuration of Insulating Housing] 
       [0042]    As shown in  FIG. 10  to  FIG. 12 , an insulating housing  11 , which constitutes a main body part of the above described switch-equipped coaxial connector  10 , is formed by, for example, molding by using a resin material such as plastic. The insulating housing  11  integrally has a base frame part  11   a,  which is composed of a plate-like member having an approximately rectangular shape in a plane, and an insertion guide part  11   b,  which is disposed at a center part of an upper surface of the base frame part  11   a.    
         [0043]    The insertion guide part  11   b  is formed so as to rise upward from an upper-side surface of the above described base frame part  11   a  to form an approximately cylindrical shape. An inner-peripheral-side surface of the insertion guide part  11   b  is formed so as to form an approximately funnel-like shape, and an inclined guide surface  11   d,  which is obliquely extended downward toward an upper-surface-side opening of a probe insertion hole  11   c  provided at a center part as an opposing insertion hole, is formed from a circular outer edge part formed at an upper edge part of the insertion guide part  11   b.  The inclined guide surface  11   d  has a function of guiding a probe  20   a,  which is provided on the above described test plug connector  20 , toward the probe insertion hole  11   c.  Even in the case in which the probe  20   a  of the test plug connector  20  is not disposed immediately above the probe insertion hole  11   c,  when a distal end part of the probe abuts on the inclined surface of the inclined guide surface  11   d,  the distal end part of the probe  20   a  is configured to be moved so as to slide down downward along the inclined guide surface  11   d  and be smoothly guided to the probe insertion hole  11   c.    
         [0044]    The probe insertion hole  11   c  provided as the opposing insertion hole is extended downward along the central axis of the base frame part  11   a  from an upper-end opening of the insertion guide part  11   b  as described above, and the probe insertion hole  11   c  is provided so as to be formed from the upper side with respect to a contact insertion path, which is provided so as to penetrate through the part between a front surface and a back surface of the insulating housing  11 . The probe insertion hole  11   c  is disposed so as to be positioned at the top of one of later-described contacts  12 , and is formed so as to form an approximately circular shape in a plane, the shape having a size having an inner diameter that allows insertion of the probe  20   a  of the test plug connector  20 . The above described insertion guide part  11   b  is disposed around the upper-surface-side opening of the probe insertion hole  11   c  so as to be approximately concentric thereto. 
       [About Configuration of Contacts] 
       [0045]    On the other hand, as shown in  FIG. 7  to  FIG. 10 , a first contact (first-side contact)  12  and a second contact (second-side contact)  13  for signal transmission are attached by being inserted into the contact insertion path, which is provided in the base frame part  11   a  of the insulating housing  11 , so as to be opposed to each other in a horizontal direction approximately orthogonal to the inserting/removing direction (vertical direction) of the above described test plug connector (opposing connector)  20 . Hereinafter, the direction in which the first contact  12  and the second contact  13  are opposed to each other will be simply referred to as “contact opposing direction”. Also, the direction in which the contacts  12  and  13  are opposed to each other will be referred to as “front”, and the direction opposite thereto will be referred to as “rear”. 
         [0046]    The first contact  12  and the second contact  13  constitute a so-called contact pair and are inserted so as to face the interior of the contact insertion path from both end surface sides of the front surface and the back surface of the insulating housing  11 , and the contacts are attached to the insulating housing  11  so that both of the contacts  12  and  13  are in a state that they are elastically in contact with each other. The contact state between both of the contacts  12  and  13  is cancelled by mating of the test plug connector  20  to obtain a separated state as described later. 
         [0047]    The above described first contact  12  and the second contact  13  have elastic beam-like members  12   a  and  13   a,  both of which have flexibility. Both of the elastic beam-like members  12   a  and  13   a  are extended like cantilevers from supporting boards  12   b  and  13   b,  which are retained in an approximately fixed state as described later, toward the front which is the contact opposing direction. The structures of the elastic beam-like members  12   a  and  13   a  will be explained in detail in later paragraphs. 
         [0048]    Particularly as shown in  FIG. 7  and  FIG. 9 , the supporting boards  12   b  and  13   b  are formed of plate-like members, which are extended approximately horizontally. Fixing pieces  12   c  and  13   c  serving as fixing parts with respect to the insulating housing  11  are extended approximately horizontally toward the outer sides of both sides from both-side edge parts of the supporting boards  12   b  and  13   b,  in other words, from both end pars in a board-width direction orthogonal to the contact opposing direction. These fixing pieces  12   c  and  13   c  are configured to be press-fitted in fixing groove parts dented so as to form groove-like shapes in a wall surface of the insulating housing  11 , and the entirety of the first contact  12  and the second contact  13  is retained by the engaging force of the fixing pieces  12   c  and  13   c  with respect to the insulating housing  11 . 
         [0049]    Cut-away parts  12   d  and  13   d  extended along the contact opposing direction are formed at coupling boundary parts between both members where the above described fixing pieces  12   c  and  13   c  are coupled to the supporting boards  12   b  and  13   b.  The cut-away parts  12   d  and  13   d  are formed so as to cut away root parts of the above described elastic beam-like members  12   a  and  13   a  by predetermined lengths from both of the front side and the rear side thereof toward the rear side and the front side. 
         [0050]    Among them, the cut-away parts  13   d  provided in the fixing piece  13   c  side are formed so that both of them in the front side and the rear side form thin groove shapes, while the cut-away parts  12   d  provided in the fixing pieces  12   c  side have different shapes in the front and the back. Specifically, the cut-away parts  12   d  disposed in the rear side are formed so as to form thin groove shapes; on the other hand, the cut-away part  12   d  disposed in the front side is formed so as to be recessed largely toward the rear side in an approximately U-shape across approximately the full width of the front edge part of the supporting board  12   b.  Since the cut-away parts  12   d  and  13   d  are provided, the widths of the coupling parts between the fixing pieces  12   c  and  13   c  and the supporting boards  12   b  and  13   b  are reduced. Corresponding to the amounts of thus-reduced widths, in other words, by the lengths of the cut-away parts  12   d  and  13   d,  the later-described span lengths of the elastic beam-like members  12   a  and  13   a  are configured to be substantially increased. 
         [0051]    Thus, in the present embodiment, the elastic beam-like member  12   a  of the first contact  12  is configured to be extended to the second contact  13  side of the opposing side with intermediation of a bent part  12   a   1  formed by bending into an approximately U-shape from a rear-side edge part of the supporting board  12   b.  Therefore, the substantial span length of the elastic beam-like member  12   a  is increased particularly by providing the rear-side cut-away parts  12   d.  On the other hand, the elastic beam-like member  13   a  of the second contact  13  is configured to be directly extended from a front edge part of the supporting board  13   b  toward the first contact  12  of the opposing side. Therefore, the substantial span length of the elastic beam-like member  13   a  is increased particularly by forming the front-side cut-away parts  13   d.  Therefore, if the first contact  12  is configured to be directly extended from the front edge part of the supporting board  12   b  toward the second contact  13  of the opposing side, front-side cut-away parts  12   d  should be formed. 
         [0052]    Furthermore, in the above described supporting boards  12   b  and  13   b,  edge parts in the opposite side of the edge parts from which the elastic beam-like members  12   a  and  13   a  are projecting, in other words, each of a front edge part of the supporting board  12   b  of the first contact  12  and a rear edge part of the supporting board  13   b  of the second contact  13  is approximately perpendicularly bent downward, and the board connecting part  12   e  or  13   e  is approximately horizontally extended from a lower end part of the approximately-perpendicularly bent downward part. The board connecting part  12   e  provided in the first contact  12  side is extended toward the rear side which is in the opposite side of the connector opposing direction, and the board connecting part  13   e  provided in the second contact  13  side is extended toward the front side which is the connector opposing direction. Lower surfaces of the board connecting parts  12   e  and  13   e  are configured to be solder-joined with electrically conductive paths for signal transmission provided on the above described wiring board so as to carry out mounting. 
         [0053]    The above described elastic beam-like member  12   a  of the first contact  12  and the elastic beam-like member  13   a  of the second contact  13  are formed of belt-like spring members which are like cantilevers projecting so as to be close to each other. The elastic beam-like member  13   a  of the second contact  13  among them is configured to be directly extended from the front edge part of the above described supporting board  13   b  toward the first contact  12  of the opposing side. On the other hand, the elastic beam-like member  12   a  of the first contact  12  is configured to be extended from the rear-side edge part of the supporting board  12   b  to the second contact  13  side of the opposing side with intermediation of the bent part  12   a   1 , which is formed by bending into an approximately U-shape. 
         [0054]    More detailed explanation will be given. In the elastic beam-like member  12   a  of the first contact  12 , a horizontal extending part  12   a   2  extended from the above described bent part  12   a   1  is approximately horizontally extended at a position above the supporting board  12   b  toward the front side, which is in the connector opposing direction. A crank part  12   a   3  bent obliquely downward is integrally continued to the front side of the horizontal extending part  12   a   2 . Furthermore, a main beam part  12   a   4  is configured to be extended toward the front side, which is the connector opposing direction, via the crank part  12   a   3 . The entirety of the elastic beam-like member  12   a  like this has elastic flexibility using the bent part  12   a   1  or a vicinity thereof as a supporting point and is configured to be swung about the supporting point in the vertical direction. 
         [0055]    In this case, the horizontal extending part  12   a   2  of the elastic beam-like member  12   a  is disposed so as to be extended along the upper wall surface of the contact insertion path provided in the above described insulating housing  11 , and a gap S 1 , which ensures flexibility of the elastic beam-like member  12   a,  is provided between the horizontal extending part  12   a   2  of the elastic beam-like member  12   a  and the upper wall surface of the insertion path of the insulating housing  11 . 
         [0056]    The crank part  12   a   3  provided in the elastic beam-like member  12   a  is obliquely bent and extended from an intermediate position in the extending direction of the elastic beam-like member  12   a  toward the lower side which is the insertion direction of the above described test plug connector (opposing connector)  20 , and the crank part  12   a   3  is configured to be obliquely bent to the upper side which is the opposite direction of the insertion direction of the test plug connector  20  from a lower end part thereof which is an extended end obliquely below thereof. A downward step is formed at an intermediate part of the elastic beam-like member  12   a  by the crank part  12   a   3  like this, and elasticity of the entire elastic beam-like member  12   a  is improved. 
         [0057]    Furthermore, the above described main beam part  12   a   4  is approximately linearly extended obliquely upward from a lower end part of the crank part  12   a   3  provided in the first contact  12  toward the front side, which is the connector opposing direction. A contact part is provided at an extended-side distal end part of the main beam part  12   a   4 , and the contact part provided in the elastic beam-like member  12   a  of the first contact  12  is brought into contact with a later-described contact part, which is provided on the elastic beam-like member  13   a  of the second contact  13 , from the lower side. Both of these contact parts are subjected to elastic contact by elastic biasing force of both of the elastic beam-like members  12   a  and  13   a.    
         [0058]    The main beam part  12   a   4 , which constitutes the elastic beam-like member  12   a  of the first contact  12 , is disposed so as to be extended at a position immediately below the above described probe insertion hole  11   c,  and the lower-end opening of the probe insertion hole  11   c  is in a positional relation that the lower-end opening faces an intermediate part of the main beam part  12   a   4  from the upper side. When the test plug connector  20  is subjected to mating from the upper side to insert the probe  20   a  of the test plug connector  20  into the connector through the probe insertion hole  11   c  particularly as shown in  FIG. 11  and  FIG. 12 , the probe  20   a  projecting downward from the probe insertion hole  11   c  abuts the intermediate part of the main beam part  12   a   3 , which constitutes the elastic beam-like member  12   a  of the first contact  12 , from the upper side. Furthermore, when the test plug connector  20  is pushed down to the lower side, the contact part provided on the elastic beam-like member  12   a  of the first contact  12  is configured to be separated downward from the contact part provided on the elastic beam-like member  13   a  of the second contact  13  by the pressing force of the probe  20   a.    
         [0059]    A through hole  12   a   5 , to which the probe  20   a  of the test plug connector  20  is brought into contact from the upper side in this process, is formed to be like a slit at the intermediate position of the main beam part  12   a   4 , which constitutes the elastic beam-like member  12   a  of the first contact  12 , in other words, at a position that abuts the probe  20   a  of the test plug connector  20 . The through hole  12   a   5  is formed of a long hole extended to be thin and long along the longitudinal direction of the main beam part  12   a   4  and is provided so as to be extended in a front-back direction from the position immediately below the above described probe insertion hole  11   c.    
         [0060]    As a result of providing the through hole  12   a   5  in the main beam part  12   a   4  constituting the elastic beam-like member  12   a  of the first contact  12  in this manner, dust such as debris that enters the interior thereof through the probe insertion hole (opposing insertion hole)  11   c  which is in an open state when the test plug connector  20  is not mated is guided downward particularly along the inclined surface of the main beam part  12   a   4  and discharged through the through hole  12   a   5 . As a result, the dust is not accumulated on the first contact  12  or the second contact  13 , and the risk that dust disturbs electrical conductivity between the first contact  12  and the second contact  13  is reduced. 
         [0061]    An inclined surface, which is to be brought into contact with the probe  20   a  of the test plug connector  20 , is provided at an opening edge part of the above described thorough hole  12   a   5 . The opening edge part of the through hole  12   a   5  is configured to be brought into contact with, in an approximately tangential direction, a curved surface formed at a distal end-side part of the probe  20   a  of the test plug connector  20  and abut the probe  20   a  at multiple points from both sides of a diagonal-line direction of the through hole  12   a   5 . 
         [0062]    When such a configuration is employed, the electrical connection between the probe  20   a  of the test connector  20  and the first contact  12  is established well, and the dust discharged through the through hole  12   a   5  is smoothly guided by the inclined surface of the through hole  12   a   5 . The stress caused when the probe  20   a  of the test connector  20  is brought into contact with the elastic beam-like member  12   a  of the first contact  12  is dispersed without being concentrated at part of the fixing pieces  12   c  of the first contact  12 , and usage durability of the first contact  12  is improved. 
         [0063]    On the other hand, as shown in  FIG. 8  and  FIG. 10 , the elastic beam-like member  13   a  of the second contact  13  is configured to be directly extended from the front edge part of the supporting board  13   b  toward the first contact  12  of the opposing side as described above and is bent obliquely downward after approximately horizontally extended toward the front side in the connector opposing direction. The entirety of the elastic beam-like member  13   a  has elastic flexibility using the coupling part with the supporting board  13   b  or the vicinity thereof as a supporting point and is configured to be swung about the supporting point in the vertical direction. 
         [0064]    The horizontal extending part of the elastic beam-like member  13   a  is disposed so as to be extended along the upper wall surface of the contact insertion path provided in the above described insulating housing  11 , and a gap S 2  which ensures flexibility of the elastic beam-like member  13   a  is provided between the horizontal extending part of the elastic beam-like member  13   a  and the upper wall surface of the insertion path of the insulating housing  11 . 
         [0065]    Furthermore, the front end part of the elastic beam-like member  13   a  of the second contact  13  is obliquely bent downward and extended in the above described manner, and the contact part provided at the distal end part in the extended side obliquely therebelow is brought into contact with the contact part, which is provided in the elastic beam-like member  12   a  of the first contact  12 , from the upper side as described above. Both of the contact parts at this point are configured to be in elastic contact with each other by the elastic biasing force of both of the elastic beam-like members  12   a  and  13   a.    
         [0066]    According to the switch-equipped coaxial connector  10  according to the present embodiment having such a configuration, elasticity with respect to the pressing force of the test plug connector  20  serving as the opposing connector is increased by the crank part  12   a   3 , which is provided in the first contact  12 , and the cut-away parts  12   d  and  13   d  provided in both of the first and second contacts  12  and  13 ; flexibility is ensured for both of the first and second contacts  12  and  13  by the gaps S 1  and S 2  provided between there and the insulating housing  11 ; and, even when the size and height of the connector are reduced, permanent deformation of the contacts  12  and  13  is prevented. 
         [0067]    Particularly, in the present embodiment, the actual span lengths of the elastic beam-like members  12   a  and  13   a  constituting the first and second contacts  12  and  13  are increased by the lengths of the cut-away parts  12   d  and  13   d  provided at the fixing pieces  12   c  and  13   c ; therefore, elasticity of the elastic beam-like members  12   a  and  13   a  has been further increased. Moreover, since flexure supporting points of the elastic beam-like members  12   a  and  13   a  are positioned in the ranges of the length directions of the fixing pieces  12   c  and  13   c,  retainability of the elastic beam-like members  12   a  and  13   a  by the fixing pieces  12   c  and  13   c  is improved. 
         [0068]    Moreover, in the present embodiment, the fixing pieces  12   c  and  13   c  provided in both of the first and second contacts  12  and  13  are fixed to the insulating housing  11  in the state that the fixing pieces are extended in an approximately horizontal direction. Therefore, supportability of the first and second contacts  12  and  13  in the inserting direction of the probe  20   a  provided in the test plug connector  20  is improved, positional accuracy at electric contact parts is improved, wobbling stability of both of the contacts  12  and  13  is improved, and positional misalignment of the first and second contacts  12  and  13  is prevented with respect to the pressing force of the test plug connector  20  and that between both of the contacts  12  and  13 . 
         [0069]    In addition, in the present embodiment, the elastic beam-like member  12   a,  which constitutes the first contact  12 , is brought into contact with the elastic beam-like member  13   a,  which constitutes the second contact  13 , as if scooping up the elastic beam-like member  13   a ; and, upon insertion/detachment of the test plug connector  20 , the contact parts provided on both of the first and second contacts  12  and  13  are brought into contact with each other so as to be in sliding contact. Therefore, the electrical contact state thereof is maintained well, and cleanliness of the contact parts is improved by a so-called wiping action mutually between both of the contacts  12  and  13 . 
       [About Electrically-Conductive Shell] 
       [0070]    On the other hand, as shown in  FIG. 1  to  FIG. 6 , an electrically-conductive shell  14  composed of a thin-plate-like electrically-conductive member is attached to the upper-surface-side surface of the above described insulating housing  11  so as to cover the insulating housing from the upper side. The electrically-conductive shell  14  is attached so as to cover part of the outer peripheral surface of the insertion guide part  11   b  from the upper surface side of the insulating housing  11 , and the electrically-conductive shell  14  is formed so that an upper-surface board  14   a  covering the upper-surface-side surface of the insulating housing  11  forms an approximately rectangular shape in a plane. 
         [0071]    At a center part of the upper surface board  14   a  forming an approximately rectangular shape in the electrically-conductive shell  14 , a ground terminal part  14   b  covering the insertion guide part  11   b  of the above described insulating housing  11  from the outer side is integrally provided so as to form an approximately hollow cylindrical shape. A fixing latch groove  14   c  forming a circular shape is provided to dent the outer peripheral surface of the ground terminal part  14   b.  An engagement projection part  20   b  provided at an electrically-conductive shell of the above described test plug connector  20  is fitted in the fixing latch groove  14   c  so that the test plug connector  20  is maintained in a state that the test plug connector  20  is coupled to the switch-equipped coaxial connector  10  with appropriate mating force. 
         [0072]    At four corner parts of the approximately rectangular shape of the upper-surface board  14   a  of the above described electrically-conductive shell  14 , board connecting parts  14   d  extending so as to hang down downward are respectively provided so as to be continued therefrom. Among these four board connecting parts  14   d,  the two board connecting parts  14   d  and  14   d  adjacent to each other in the opposing direction of the first contact  12  and the second contact  13  are integrally coupled with each other. The integrally-coupled board connecting parts  14   d  and  14   d  of a first side and the board connecting parts  14   d  and  14   d  of a second side are disposed so as to sandwich the contact pair, which is composed of the first contact  12  and the second contact  13 , from both sides. Solder joining pieces  14   f,  which respectively form distal end parts of the board connecting parts  14   d,  are solder-joined with a ground electrically-conductive path on an illustration-omitted wiring board, thereby establishing ground connection so as to retain the entirety of the switch-equipped coaxial connector  10 . 
         [0073]    At this point, each of the board connecting parts  14   d  thereof is extended downward from an edge of the above described upper-surface board  14   a  so as to form a curves shape, and the transverse cross-sectional shape thereof in a direction orthogonal to the direction of coupling between the two board connecting parts  14   d  and  14   d  forms a curves shape so as to form an approximately S-shape or an approximately Z-shape. 
         [0074]    The shape of the board connecting part  14   d  provided in the electrically-conductive shell  14  will be explained in detail. The board connecting part  14   d  has an inclined wall surface having a reversed-tapered shape extended so as to be dented obliquely downward from the edge of the above described upper-surface board  14   a  toward the inner side of the connector and has a horizontal wall surface projected again approximately horizontally from a lower end part of the inclined wall surface toward the outer side of the connector. The reverse-tapered inclined wall surface and the horizontal wall surface provided at the board connecting part  14   a  define a dented part  14   e,  which is recessed toward the side of the above described second contact  13  and the first contact  12 . The dented part  14   e  is configured to be provided so as to dent in the board connecting part  14   d.  Also, the horizontal wall surface of the above described board connecting part  14   a  is configured to form the solder joining piece  14   f,  which is to be solder-joined on the wiring board. 
         [0075]    In the case in which the dented parts  14   e  are provided to be recessed in the board connecting parts  14   a  in this manner, even if an excess of a solder material or flux used for the board connecting part  14   a  of the electrically-conductive shell  14  is to move up along the board connecting parts  14   a  or other wall surfaces of the electrically-conductive shell  14 , the excess of the solder or flux that is to move up there is stored in the dented part  14   e.  Moreover, the reverse-tapered inclined wall surfaces constituting the wall surfaces of the dented parts  14   e  reduce the move-up acting force of the solder material or flux. Furthermore, since the wall surface of each of the dented parts  14   e  is extended in a curved shape, the move-up length of the solder material and flux is extended, so-called solder wicking is prevented well, and influence thereof on the state of electrical conduction is significantly reduced. 
         [0076]    Moreover, since the board connecting part  14   a  of the electrically-conductive shell  14  according to the present embodiment has the solder joining piece  14   f  extended from the dented part  14   e  toward the outer side of the connector as described above, the state of joint of the solder material with respect to the solder joining piece  14   f  of the board connecting part  14   a  is immediately checked visually by an operator, and working efficiency is improved. 
         [0077]    In this case, a distal end part of the solder joining piece  14   f  according to the present embodiment is equal to the width-direction size of the upper-surface board  14   a,  which has the largest outer shape of the above described electrically-conductive shell  14 , or positioned in a somewhat inner side of the connector. According to such a configuration, downsizing of the entirety can be carried out without causing problems in the operation of soldering with respect to the solder joining piece  14   f.    
         [0078]    The invention accomplished by the present inventor has been explained in detail based on the embodiment. However, the present embodiment is not limited to the above described embodiment, and it goes without saying that various modifications can be made without departing from the gist thereof. 
         [0079]    For example, although the crank part is provided only in the first contact in the above described embodiment, the crank parts may be provided in both of the contacts, respectively. 
         [0080]    Moreover, although the through hole is provided in the first contact in the above described embodiment, a through hole may be provided in the second contact in accordance with an overall disposing relation. 
         [0081]    Furthermore, the present invention can be similarly applied also to a switch-equipped coaxial connector used in a use other than a circuit test switch like the above described embodiment. 
         [0082]    As described above, the present invention can be widely applied to various switch-equipped coaxial connectors used in various electronic/electric devices.