Abstract:
A coaxial connector includes an insulation housing having a receptacle opening portion for receiving a central conductive member of a coaxial plug; an outer conductive member for detachably attaching an outer conductive member of the coaxial plug; a connection member; a switching spring member capable of being elastically deformed downwardly; and an insulation member fixed to the connection member or the switching spring member so that the insulation member is situated between the connection member and the switching spring member. The switching spring member is pushed and displaced so that the switching spring member is disconnected from the connection member when the coaxial plug is inserted into the insulation housing. The connection member is pushed to displace the switching spring member through the insulation member so that the switching spring member is disconnected from the connection member when the coaxial plug is inserted into the insulation housing.

Description:
BACKGROUND TECHNOLOGY AND RELATED TECHNOLOGY 
     The present invention relates to a coaxial connector for mounting on a substrate. In particular, the present invention relates to a coaxial connector with a switch, which is equipped with a switching mechanism for switching a high-frequency signal circuit, an antenna, and the like. 
     In a portable information communication device such as a cellular phone, a handheld-type computer, and a tablet-type computer, a conventional coaxial connector with a switch has been widely used for inspecting a built-in high-frequency circuit thereof. The conventional coaxial connector with a switch includes, for example, an insulation housing having a hole that can receive a central conductive member of a coaxial plug; an outer conductive member provided outside the insulation housing; and a stationary terminal and a movable terminal provided under the hole. Furthermore, while the stationary terminal includes a contact section, the movable terminal includes a securing section to be secured on the insulation housing, and an elastic section that can touch the central conductive member of the coaxial plug and contact with the contact section (for example, refer to Patent Reference 1). 
     Patent Reference 1: Japanese Patent Publication No. 2007-141665 
     In case of the conventional coaxial connector with a switch, when a coaxial plug is not attached thereto, the movable terminal is pressed onto a contact section of the stationary terminal by elastic force of the elastic section, and the stationary terminal and the movable terminal keep the electrically connected state. On the other hand, when the coaxial plug is attached thereto, a lower end of the central conductive member of the coaxial plug is put through a vertical hole of the connector. In this state, the central conductive member touches the elastic section, and the elastic section is pressed down by and end part of the central conductive member to elastically deform, and moves away from the contact section. The stationary terminal and the movable terminal are electrically disconnected from each other, and at the same time, the central conductive member and the movable terminal are in electrically connected state. As such, signals, which flew from the movable terminal to the stationary terminal, are made flow from the movable terminal to the central conductive member and thereby it is possible to inspect a high-frequency circuit connected to the movable terminal. 
     In these years, there have been increased demands to measure or inspect both high-frequency circuits, and antennas, etc. of portable information communication devices by switching therebetween. In case of a conventional coaxial connector with a switch, for inspection after mounting an integrated circuit, electronic component, or the like, it is possible to conduct inspection, for example, while temporarily disconnecting the antenna and connecting only to the high-frequency circuit, but it was impossible to conduct inspection while temporarily disconnecting the high-frequency circuit and connecting only to the antenna. 
     For this reason, it is necessary to develop a coaxial connector with a switch, whereby it is possible to switch to a plurality of terminals. As such a coaxial connector with a switch, both high-frequency circuit and antenna characteristics of which can be measured, for example, there is a technique described in Patent Reference 2. 
     Patent Reference 2: Japanese Patent Publication No. 2008-226588 
     According to the conventional coaxial connector with a switch described in Patent Reference 2, the plug includes a resin protrusion, and upon connector fitting, the resin protrusion touches to press down a first switch spring of a receptacle to shut off electrical connection with the first switch spring but keep electrical connection with a second switch spring, and adversely the resin protrusion touches to press down the second switch spring of the receptacle to shut off electrical connection with the second switch spring, but keep electrical connection with the first switch spring, so that electrical connection can be switched by changing the position of the resin protrusion of the plug. 
     However, the conventional coaxial connector with a switch described in Patent Reference 2 has a very complicated coaxial connector structure, and production efficiency is poor and the size is large. In addition, since a direction upon fitting a plug connector is fixed, it is very convenient to use. 
     Therefore, an object of the invention is to provide a coaxial connector with a switch, which can attain high productivity, requires less manufacturing cost, can be easily operated, is highly durable, and enables to switch among a plurality of terminals. This and further objects and novelties of the invention will be revealed from the description of the specification and accompanying drawings. 
     Further objects and advantages of the invention will be apparent from the following description of the invention. 
     SUMMARY OF THE INVENTION 
     In order to attain the objects described above, according to a first aspect of the present invention, a coaxial connector with a switch to be mounted on a substrate includes an insulation housing that has a hole that can receive a central conductive member of a coaxial plug from above; an outer conductive member that is provided outside the insulation housing and that the outer conductive member of the coaxial plug can be attached thereto and detached therefrom; a connection member that is provided so as to be exposed in the hole; and a switching spring member that is provided under the hole and also under the connection member and is capable of elastically displacing downward when the insulation housing receives the central conductive member of the coaxial plug. 
     According to the first aspect of the present invention, an insulation member is fixed while being in a state that the insulation member is engaged with at least one of the connection member and the switching spring member in the thickness direction, such that the insulation member is provided between the connection member and the switching spring member. It is configured such that the connection member is disconnected from the switching spring member, when the central conductive member of the coaxial plug is inserted therein so as to directly press the switching spring member to displace and separate therefrom, or press the connection member to indirectly displace and separate the switching spring member therefrom via the insulating member. 
     According to a second aspect of the present invention, a coaxial connector with a switch to be mounted on a substrate includes an insulation housing that has a hole that can a receive central conductive members of a first and a second coaxial plug from above; an outer conductive member that is provided outside the insulation housing and that outer conductive members of the first and second coaxial plug can be attached thereto and detached therefrom; a connecting plate that is provided under the hole and can elastically displace downward by receiving the central conductive member of the coaxial plug; and a switching spring member that is provided under the hole and also under the connecting plate and is capable of elastically displacing downward when the insulation housing receives the central conductive member of the coaxial plug. 
     According to the second aspect of the present invention, between the connecting plate and the switching spring member, there is provided an insulation member that is engaged and fixed to at least one of the connecting plate and the switching spring member in the thickness direction. The connecting plate has on an upper surface thereof a first contact section that contacts with an outer extending section of the central conductive member of the first coaxial plug when the central conductive member of the first coaxial plug is fitted in the hole of the insulation housing. Further, the switching spring member has on an upper surface thereof a second contact section that contacts with the central conductive member of the second coaxial plug when the central conductive member of the second coaxial plug is fitted in the hole of the insulation housing. The connecting plate has on a lower surface thereof a third contact section that contacts with a fourth contact section of the switching spring member, when any of the central conductive members of the first and the second coaxial plugs is not fitted in the hole of the insulation housing. 
     According to the present invention, there is provided the coaxial connector with a switch that can switch among a plurality of terminals. Further, it is possible to produce the coaxial connector at high productivity and low manufacturing cost. Further, it is possible to attain satisfactory operability without restriction on a rotational angle upon attaching the coaxial plug. Further, it is possible to attain high durability since the insulation member is fixed while being engaged with at least one of the connection member and the switching spring member in the thickness direction. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a top view showing a whole configuration of a coaxial connector according to an embodiment of the present invention; 
         FIG. 2  is a sectional view of the coaxial connector taken along a line A-A of  FIG. 1 ; 
         FIG. 3  is a perspective sectional view of the coaxial connector taken along the line A-A of  FIG. 1 ; 
         FIG. 4  is an exploded perspective view of the coaxial connector according to the embodiment of the present invention; 
         FIGS. 5(   a ) and  5 ( b ) are perspective views showing a configuration example of a switching spring member of the coaxial connector, in which an insulation member is integrally molded therewith, wherein  FIG. 5(   a ) is the one viewed from thereabove and  FIG. 5(   b ) is the one viewed from therebelow; 
         FIGS. 6(   a ) and  6 ( b ) are perspective views showing the configuration example of the switching spring member of the coaxial connector, before the insulation member is integrally molded therewith, wherein  FIG. 6(   a ) is the one viewed from thereabove and  FIG. 6(   b ) is the one viewed from therebelow; 
         FIG. 7  is a perspective view showing a first modification example of the switching spring member of the coaxial connector, in which an insulation member is integrally molded therewith; 
         FIG. 8  is a perspective view showing the first modification example of the switching spring member of the coaxial connector, before the insulation member is integrally molded therewith; 
         FIGS. 9(   a ) and  9 ( b ) are perspective views showing a second modification example of the switching spring member of the coaxial connector, in which an insulation member is integrally molded therewith, wherein  FIG. 9(   a ) is the one viewed from thereabove and  FIG. 9(   b ) is the one viewed from therebelow; 
         FIG. 10  is a perspective view showing the second modification example of the switching spring member of the coaxial connector, before an insulating section is integrally molded therewith; 
         FIGS. 11(   a ) and  11 ( b ) are perspective views showing a third modification example of the switching spring member of the coaxial connector, in which the insulation member is integrally molded therewith, wherein  FIG. 11(   a ) is the one viewed from thereabove and  FIG. 11(   b ) is the one viewed from therebelow; 
         FIG. 12  is a perspective view showing the third modification example of the switching spring member of the coaxial connector, before an insulation member is integrally molded therewith; 
         FIGS. 13(   a ) and  13 ( b ) are perspective views of a modification example of a connecting plate of the coaxial connector, wherein  FIG. 13(   a ) is the one viewed from thereabove and  FIG. 13(   b ) is the one viewed from therebelow; 
         FIG. 14  is a perspective view showing a configuration of a combination of a lower insulation housing and the switching spring member of the coaxial connector; 
         FIG. 15  is a perspective view showing a configuration of a combination of an upper insulation housing, a connecting plate, and an outer conductive member of the coaxial connector; 
         FIGS. 16(   a ) and  16 ( b ) are views showing the coaxial connector in a state where a coaxial plug with an outer extending section is fitted in the coaxial connector, wherein  FIG. 16(   a ) is a whole view and  FIG. 16(   b ) is an enlarged sectional view near the coaxial connector; 
         FIGS. 17(   a ) and  17 ( b ) are views showing the coaxial connector in a state where a coaxial plug without an outer extending section is fitted in the coaxial connector, wherein  FIG. 17(   a ) is a whole view and  FIG. 17(   b ) is an enlarged sectional view near the coaxial connector; 
         FIG. 18  is a perspective view showing a configuration of an insulation member provided on a lower surface of the connecting plate of the coaxial connector; 
         FIGS. 19(   a ) and  19 ( b ) are views showing a configuration of the insulating material provided on the lower surface of the connecting plate of the coaxial connector according to the embodiment of  FIG. 18 , wherein  FIG. 19(   a ) is a top view thereof and  FIG. 19(   b ) is a sectional view thereof taken along a line A-A in  FIG. 19(   a ); 
         FIG. 20  is a perspective view showing the insulation member provided on the lower surface of the connecting plate of the coaxial connector according to another embodiment of the present invention; 
         FIGS. 21(   a ) and  21 ( b ) are views showing a configuration of the insulation member provided on the lower surface of the connecting plate of the coaxial connector according to the embodiment of  FIG. 20 , wherein  FIG. 21(   a ) is a top view thereof and  FIG. 21(   b ) is a sectional view thereof taken along a line A-A in  FIG. 21(   a ); and 
         FIG. 22  is a perspective view showing a configuration of the insulation member on the lower surface of the coaxial connector according to another embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Hereunder, referring to the accompanying drawings, embodiments of the present invention will be fully described. Here, in any figure that describes embodiments of the present invention, the same reference numerals are basically used for the same members and repetitive description will be omitted. The following embodiments of the present invention will be described by dividing in several sections or embodiments as necessary for convenience, but unless clearly stated, those sections or embodiments are related to each other, i.e. modification of a part or whole thereof, details, supplemental description, etc. Moreover, in the embodiments below, an amount of elements (including numbers, numerical values, volumes, and range) may be specifically referred, unless clearly stated or except a case that the amount is obviously limited to a specific one in principle, such amount shall not be limited to the specific one and can be greater than the specific one. 
       FIG. 1  is a top view showing a whole configuration of a coaxial connector according to an embodiment of the present invention;  FIG. 2  is a sectional view taken along A-A of  FIG. 1 ;  FIG. 3  is a perspective sectional view taken along A-A of  FIG. 1 ; and  FIG. 4  is an exploded perspective view of the coaxial connector according to an embodiment of the present invention. 
     First, referring to  FIGS. 1-4 , a configuration of the coaxial connector according to the embodiment will be described. The coaxial connector  100  according to the embodiment is a coaxial connector with a switch for mounting on a substrate, and includes an insulation housing  200  (the insulation housing  200  is composed of an upper insulation housing  200   a  and a lower insulation housing  200   b ) having a vertical hole  203  that can receive a central conductive member  701   a  or  701   b  of a coaxial plug  700   a  or  700   b  (see  FIGS. 16 ,  17 , and other figures); an outer conductive member  300  that is provided outside the insulation housing  200  and that the outer conductive member  702  or  702   b  of the coaxial plug  700   a  or  700   b  can be attached/detached thereto/therefrom; a connecting plate  400  that is provided under the vertical hole  203 ; a switching spring member  500  that is provided under the vertical hole  203  and also under the connecting plate  400 ; and an insulation member  601  that is integrally formed on both surfaces of the switching spring member  500 . The coaxial connector  100  can be mounted on a substrate, and being connected to a circuit of the substrate through a substrate connecting section  401  of the connecting plate  400  that is exposed outside or a substrate connecting section  501  of the switching spring member  500 , the coaxial connector  100  can form a part of the substrate circuit. 
     In the embodiment, the coaxial connector  100  of the embodiment may be used for testing of characteristics, inspections, or the like of a built-in high-frequency circuit and an antenna in a portable information communication device such as cellular phones, smartphones, notebook computers, and tablet-type personal computers. Moreover, for high-frequency circuits, the outer conductive member  300  is shielded, and the connecting plate  400  and the switching spring member  500  are impedance-matched. 
     In the embodiment, the insulation housing  200  may be formed, for example, from insulating resin such as plastics. The insulation housing  200  has a main body part that is generally rectangular parallelepiped, and an upper part of generally center thereof has a cylindrical shape. In addition, on an upper surface of the insulation housing  200 , there is formed a conical recess  202 , and on a center part of a bottom surface of the recess  202 , there is provided a vertical hole  203  that can receive the central conductive member  701   a  or  701   b  of the coaxial plug  700   a  or  700   b  from thereabove. 
     Furthermore, under the vertical hole  203 , there is formed a horizontally long space  204  that connects to the vertical hole  203 , and once the coaxial plug  700   a  or  700   b  is attached thereto, an end part of the central conductive member  701   a  or  701   b  goes through the vertical hole  203  and reaches the space  204 . Here, the insulation housing  200  can be divided into, for example, two components (the upper insulation housing  200   a  and the lower insulation housing  200   b ), and has a configuration that is suitable for integrating the connecting plate  400 , the switching spring member  500 , and so on. 
     In the embodiment, the outer conductive member  300  may be formed, for example, by punching a conductive material such as sheet metal and then bending. On an upper surface of the outer conductive member  300 , there is provided a cylindrical upper section  301 . Upon inserting the coaxial plug, a lower end section of the outer conductive member  702   a  or  702   b  of the coaxial plug  700   a  or  700   b  touches the upper section  301 , and becomes electrically connected to the outer conductive member  300  of the coaxial connector  100 . 
     In addition, on an outer circumferential surface of the upper part  301  of the outer conductive member  300 , there is formed an annular groove  302  having a semicircular shape in the sectional view thereof, such that, upon inserting another type of a coaxial plug (not illustrated), a lower end section of the outer conductive member  702   a  or  702   b  of the coaxial plug can be fitted in the annular groove  302 . 
     In the embodiment, the connecting plate  400  may be formed, for example, by punching sheet metal of a conductive material, such as beryllium copper, phosphor bronze, ternary copper, and Corson copper and then bending. The connecting plate  400  includes a flat securing section  403 ; an extending section  404  that extends from the securing section  403  towards a center of the insulation housing  200 ; and a substrate connecting section  401  provided at an end section that is formed being bent downward from a basal end side of the securing sections  403 . 
     In the embodiment, the extending section  404  has a circular hole  407  having a diameter smaller than that of the vertical hole  203 , right under the vertical hole  203 , such that a thin central conductive member  701   b  of the coaxial plug  700   b  can go therethrough. The securing section  403  is integrally molded in the space  204 , while keeping its horizontal attitude, from a side of the insulation housing  200 . As a result, the securing section  403  is fixed inside the insulation housing  200 , and the substrate connecting section  401  remains in a state of being exposed to outside the insulation housing  200 . 
     Moreover, in a generally middle part between the securing section  403  and the extending section  404 , there is provided a contact section (third contact section)  402  that is depressed from the lower side to the upper side, so that the contact section (a fourth contact section)  504  of the switching spring member  500  slightly slides to contact thereto and thereby it is possible to enhance the contact reliability. Moreover, an end part of the connecting plate  400  has a forked configuration so as to contact at multiple points. 
     In addition, the extending section  404  of the connecting plate  400  is capable of elastically deform, slightly curving upward, and with the elastic force, it is possible to enhance reliability of contact with the central conductive member  701   a  of the coaxial plug  700   a.  Moreover, upon contacting with the central conductive member  701   a , since the extending section  404  is pressed down such that the contact section  402  of the connecting plate  400  and the contact section  504  of the switching spring member  500  slide to contact, it is possible to further obtain wiping (cleaning) effect of the contact sections  402  and  504 . Here, the insulating hosing  200  can be divided into, for example, two components ( 200   a  and  200   b ), so that it is suitable to incorporate an elastic piece that extends upward such as an elastic section  503  of the switching spring member  500 , which will be described later. 
       FIGS. 5(   a ) and  5 ( b ) are perspective view showing a configuration example of a switching spring member  500  (finished component), in which an insulation member  601  is integrally molded therewith, wherein  FIG. 5(   a ) is the one viewed from thereabove and  FIG. 5(   b ) is the one viewed from therebelow.  FIGS. 6(   a ) and  6 ( b ) are perspective views showing a configuration example of the switching spring member  500  (terminal only), before the insulation member  601  is integrally molded therewith, wherein  FIG. 6(   a ) is the one viewed from thereabove and  FIG. 6(   b ) is the one viewed from therebelow. 
     In the embodiment, the switching spring member  500  may be formed, for example, by punching sheet metal of a conductive material, such as beryllium copper, phosphor bronze, ternary copper, and Corson copper and then bending. The switching spring member  500  includes a flat securing section  502 ; a substrate connecting section  501  that is formed being bent downward from a basal end side of the securing section  502 ; and an elastic section  503  that extends from the securing section  502  diagonally upward like a cantilever in the end direction. 
     In the embodiment, the contact section (second contact section)  509  provided at generally center of the elastic section  503  can touch a thin central conductive member  701   b  of the coaxial plug  700   b,  and has two contact sections (fourth contact section)  504  that are forked at end side relative to the touching position. The two contact sections  504  can contact with lower ends of the two contact sections (third contact section)  402  of the connecting plate  400 . 
     On an upper surface of the switching spring member  500 , there is formed an insulation member  601  (upper sections  601   a  and  601   b ) at a part that is off from a position an end of thin central conductive member  701   b  of the coaxial plug  700   b  and a part of an end of the central conductive member  701   a  having the outer extending section of the coaxial plug  700   a  touches. In addition, in the insulation member  601 , the upper parts  601   a  and  601   b  are joined to the lower part  601   c  via the two holes  511   a  and  511   b  of the switching spring member  500  (see  FIGS. 6(   a ) and  6 ( b )). 
     In the embodiment, the upper part  601   a  and the upper part  601   b  of the insulation member  601  are separated, and joined on a lower surface of the switching spring member  500  by the lower part  601   c.  Integrally molding the insulation member  601  having larger area than the holes  511   a  and  511   b  on the upper and lower surfaces of the switching spring member  500  so as to interpose therebetween, the insulation member  601  is fixed being in a state of engaging with the switching spring member  500  in the thickness direction (in a direction that an end part of the central conductive member  701   b  touches and presses), so that the insulation member  601  is strongly secured onto the switching spring member  500 , and thereby the insulation member  601  hardly comes off from the switching spring member  500 . 
     In the embodiment, the joining section  512  between the hole  511   a  and the hole  511   b  under the switching spring member  500  is made even thinner, so as to be able to enhance flowability of molding material upon integral molding of resin and secure enough thickness of the molded material. In addition, on the insulating section  601   b  near the connecting plate  400 , there is provided a slope  601   d  so as to avoid interference with the connecting plate  400 . 
     With this configuration, when the coaxial plug is not inserted, the contact between the third contact section  402  and the fourth contact section  504  is not inhibited. With a configuration of connecting the two insulating sections  601   a  and  601   b,  securing strength is enhanced, and by further filling the backside parts, which are pressed with the central conductive member of the coaxial plug, with resin, it is possible to prevent plastic deformation of the spring. 
       FIGS. 7-12  are perspective views of modification examples of the switching spring member  500 .  FIGS. 7(   a ) and  7 ( b ) are perspective views showing a first modification example of the switching spring member  500  (finished component), in which the insulation member  601  is integrally formed with; and  FIG. 8  is a perspective view showing a first modification example of the switching spring member (terminal only), before the insulation member  601  is integrally molded therewith. As shown in  FIGS. 7(   a ) and  7 ( b ), it is also possible to form a donut-shaped insulation member  601  by integral molding so as to sandwich both surfaces of the switching spring member  500 . 
       FIGS. 9(   a ) and  9 ( b ) are perspective view showing a second modification example of a switching spring member (finished component), in which the insulation member  601  is integrally molded therewith, wherein  FIG. 9(   a ) is the one viewed from thereabove and  FIG. 9(   b ) is the one viewed from therebelow.  FIG. 10  is a perspective view showing a second modification example of the switching spring member  500 , before the insulation member  601  is integrally molded therewith. As shown in  FIGS. 9(   a )- 9 ( b ) and  10 , it is also possible to form a cutaway section  513  on both sides of the switching spring member  500  and form a strip-shaped insulation member  601  by integral molding so as to hold the cutaway sections  513  from the both sides. 
       FIGS. 11(   a ) and  11 ( b ) are perspective views showing a third modification example of the switching spring member, in which an insulating section is integrally molded therewith, wherein  FIG. 11(   a ) is the one viewed from thereabove and  FIG. 11(   b ) is the one viewed from therebelow.  FIG. 12  is a perspective view showing a third modification example of the switching spring member  500 , before an insulation member  601  is integrally molded therewith. 
     As shown in  FIGS. 11(   a )- 11 (b) and  12 , it is possible to form the insulation member  601  by providing a hole  514  in the contact section  509  of the elastic section  503  of the switching spring member  500  and then integral molding the insulation member  601  on upper and lower surfaces of the switching spring member  500  through the hole  514 . Here, having the diameter of the insulation member  601  larger than that of the hole  514 , it is possible to prevent coming off of the insulation member  601 . 
     In case of the third modification example, there is formed a recess (concave section) at a center part of an end section of the thin central conductive member  701   b  of the coaxial plug  700   b,  which is a part that touches the insulation member  601 , and by having the periphery around the end part of the central conductive member  701   b  cylindrically protrude, only the periphery contacts with the switching spring member  500  upon fitting of the coaxial plug, while avoiding interference with the insulation member  601 . In addition, there is formed a protrusion (convex section) at a center part of an end part of the thick central conductive member  701   a  of the coaxial plug  700   a,  which is a part that touches the insulation member  601 , such that the protrusion presses down the switching spring member  500  upon fitting the coaxial plug and thereby only the periphery part of central conductive member  701   a  contacts with the connecting plate  400 . 
       FIGS. 13(   a ) and  13 ( b ) are perspective views of a modification example of the connecting plate  400 , wherein  FIG. 13(   a ) is the one viewed from thereabove and  FIG. 13(   b ) is the one viewed from therebelow. 
     As shown in  FIGS. 13(   a ) and  13 ( b ) are, it is also possible to form the connecting plate  400  by stamping the contact section  408  around the hole  407  such that the contact section  408  around the hole  407  is formed in a shape that protrudes on the upper surface side. At this time, providing a slope on an upper surface of the protrusion to form an edge section, it is possible to prevent adhesion of foreign substances such as dirt on the surface. 
       FIG. 14  is a perspective view showing a configuration with a combination of a lower insulation housing  200   b  and the switching spring member  500 . Those components can be made by assembling parts or made by integral injection molding of resin or the like in a die.  FIG. 15  is a perspective view showing a configuration with a combination of an upper insulation housing  200   a,  the connecting plate  400 , and the outer conductive member  300  in a state of being flipped over. Those components can be made by assembling parts or made by integral injection molding of resin or the like in a die. 
     In the embodiment, the coaxial connector  100  can be assembled by flipping the configuration of  FIG. 15 , then putting it over the configuration of  FIG. 14 , and crimping both sides of the outer conductive member  300 . Moreover, a support section  206  of the lower insulation housing  200   b  is configured to be able to interfere with both edges of the extending section  404  of the connecting plate  400 , so that even if the connecting plate  400  is pressed down with strong force upon fitting the coaxial plug, the connecting plate  400  can move downward only for a specific amount because of the support section  206 . 
       FIGS. 16(   a ) and  16 ( b ) are views showing a state where a coaxial plug  700   a  with an outer extending section  705  is fitted in the coaxial connector  100 , wherein  FIG. 16(   a ) is a whole view and  FIG. 16(   b ) is an enlarged sectional view near the coaxial connector  100 .  FIGS. 17(   a ) and  17 ( b ) are views showing a state where a coaxial plug  700   b  without an outer extending section is fitted in the coaxial connector  100 , wherein  FIG. 17(   a ) is a whole view and  FIG. 17(   b ) is an enlarged sectional view near the coaxial connector  100 . 
     In inspection, coaxial plugs having at least two types of end sections are used. Here, in this specification, an “end section” of a central conductive member refers to an end section of the central conductive member in an axial direction thereof, which is a part to be inserted in the vertical hole of the coaxial connector. In addition, an “end part” of the central conductive member is a part of the “end section”, which is a part that touches the switching spring member. Furthermore, an “outer extending section” is a part of the “end section”, which is an annular part that is provided around the “end part” and extends in a diametric direction of the central conductive member. 
     In case of electrically disconnecting between the connecting plate  400  and switching spring member  500  and electrically connecting between the connecting plate  400  and the central conductive member of the coaxial plug in order to measure antenna characteristics or the like, a first coaxial plug  700   a,  in which an end section of the central conductive member has a large diameter, is used. 
     As shown in  FIG. 16(   b ), the end part of the coaxial plug  700   a  has an annular protrusion  703 , a sectional view of which has a step-like shape, and which protrudes downward from a lower end position of the outer extending section  705 . The protrusion  703  is provided at a position so as to go through the hole  407  of the connecting plate  400 , and the outer circumferential part of the protrusion  703  is made to have larger diameter than that of the hole  407  and forms the outer extending section  705 . 
     In the embodiment, the protrusion  703  is configured to touch the insulating sections  601   a  and  601   b  on the switching spring member  500 . With the thickness of the insulating sections, the central conductive member  701   a  is configured not to contact with the contact section  509  of the switching spring member  500 . In addition, the outer extending section  705  of the central conductive member  701   a  is configured to touch the contact section  408  of the connecting plate  400  upon inserting the coaxial plug  700   a.    
     Moreover, the coaxial plug is elastically supported to the plug main body, such that the outer conductive member  702   a  or  702   b  can displace in an up-and-down direction with the plug insulating body, and the central conductive member is also independently elastically supported so as to be capable of displacing. 
     In case of electrically disconnecting between the connecting plate  400  and the switching spring member  500  and electrically connecting between the switching spring member  500  and the central conductive member of the coaxial plug in order to measure characteristics of high-frequency circuit or the like, a second coaxial plug  700   b,  in which an end section of the center connector has a smaller diameter than that of the first coaxial plug  700   a,  is used. 
     In the embodiment, the diameter of the end section of the central conductive member  701   b  of the second coaxial plug  700   b  is smaller than that of the hole  407  of the connecting plate  400  so as to be able to go through the hole  407 . The end section of the central conductive member  701   b  is configured to touch the contact section  509  of the switching spring member  500 . Here, the connecting relation between the antenna and the high-frequency circuit can be opposite to that described above. 
     When the coaxial plug  700   a  or  700   b  is not attached, the contact section (fourth contact section)  504  of the switching spring member  500  is pressed onto the contact section (third contact section)  402  of the connecting plate  400  by elastic force of the elastic section  503 , and the connecting plate  400  and the switching spring member  500  keep the electrically connected state. 
     When the first coaxial plug  700   a  having the outer extending section  705  is attached, a lower end section of the outer conductive member  702   a  of the first coaxial plug  700   a  touches the outer conductive member  300 , and the end section of the central conductive member  701   a  of the coaxial plug  700   a  is put through the vertical hole  203 . In this state, the protrusion  703  of the end part of the central conductive member  701   a  of the coaxial plug  700   a  touches the insulation member  601  of the elastic section  503 . At this time, since the elastic force of the central conductive member  701   a  of the coaxial plug  700   a  is stronger than that of the elastic section  503 , the elastic section  503  is pressed down by the central conductive member  701   a  of the coaxial plug  700   a  to elastically deform, the contact section  504  moves away from the contact section  402 , and the connecting plate  400  and the switching spring member  500  are electrically disconnected. 
     At the same time, the outer extending section  705  of the end section of the central conductive member  701   a  of the coaxial plug  700   a  touches the contact section (first contact section)  408  of the outer edge of the hole  407  of the extending section  404  of the first terminal  400 , and the central conductive member  701   a  of the coaxial plug  700   a  and the connecting plate  400  are in connected state. As such, it is possible to flow signals, which flew from the connecting plate  400  to the switching spring member  500 , from the connecting plate  400  to the central conductive member  701   a  of the coaxial plug  700   a  so as to be able to inspect the antenna. 
     In the embodiment, the second contact section  509 , the fourth contact section  504 , and the insulation member  601  are preferably in positions relative to each other so as to block the connection between the third contact section  402  and the fourth contact section  504 . More specifically, since there is provided the fourth contact section  504  on a free end side of the cantilever-like second terminal  500 , and the insulation member  601  touches at near the basal section side thereof relative to the position of the contact section, the amount of deformation of the fourth contact section  504 , which is on the free end side, is greater than that of the touched section. 
     When the second coaxial plug  700   b  having a central conductive member, in which an end section has a small diameter, is attached, a lower end of the outer conductive member  702   b  of the second coaxial plug  700   b  touches the outer conductive member  300 , and an end section of the central conductive member  701   b  of the coaxial plug  700   b  is put through the vertical hole  203 . In this state, the central conductive member  701   b  of the coaxial plug  700   b  touches the contact section (second contact section)  509  of the elastic section  503 . 
     At this time, since elastic force of the central conductive member  701   b  of the coaxial plug  700   b  is stronger than that of the elastic section  503 , the elastic section  503  is pressed down by the central conductive member  701   b  of the coaxial plug  700   b  and elastically deforms, and the contact section  504  moves away from the contact section  402 , so that the connecting plate  400  and switching spring member  500  are electrically disconnected, and the central conductive member  701   b  of the coaxial plug  700   b  and the switching spring member  500  are in a connected state. As such, signals, which flew from the switching spring member  500  to the connecting plate  400 , are made flow from the switching spring member  500  to the central conductive member  701   b  of the coaxial plug  700   b,  and it is possible to inspect the high-frequency circuit. 
       FIGS. 18-22  are views showing a configuration, in which an insulation member  601  is provided on a lower surface of the connecting plate  400  of the coaxial connector, according to another embodiment. 
     As shown in  FIGS. 18 and 19(   a )- 19 ( b ), it is also possible to provide the insulation member  601  on a lower surface of the end part of the elastic section  503  of the connecting plate  400 . In this case, as the connecting plate  400  is pressed down by the outer extending section  705  of the central conductive member, which has a large diameter, the switching spring member  500  is also pressed down by operation of the insulation member  601 , and thereby it is possible to block contact between the connecting plate  400  and the switching spring member  500 . More specifically, even in case of a central conductive member that does not have the protrusion  703  as shown in  FIG. 16 , without directly pressing down the insulation member  601  with the central conductive member  701   a  or  701   b,  it is possible to shut off electrical connection between the connecting plate  400  and the switching spring member  500 . 
       FIGS. 20 and 21(   a )- 21 ( b ) are views showing another configuration example of the insulation member provided on the lower surface of the connecting plate of the coaxial connector according to another embodiment of the present invention, similarly to  FIGS. 18 and 19(   a )- 19 ( b ). 
     As shown in  FIGS. 20 and 21(   a )- 21 (B), it is also possible to make a hole  515  at two positions around the hole  407  of the elastic section  503  of the connecting plate  400  and form the insulation member  601  so as to fit in the holes  515  from a lower surface of the connecting plate  400 . In this case, as the connecting plate  400  is pressed down by the central conductive member having a large diameter, the switching spring member  500  is also pressed down by operation of the insulation member  601 , and thereby it is possible to shut off the contact between the connecting plate  400  and the switching spring member  500 . 
     More specifically, even in case of a central conductive member without the protrusion  703  as shown in  FIG. 16 , it is possible to shut off the electrical connection between the connecting plate  400  and the switching spring member  500 , without directly pressing the insulation member  601  by the central conductive member  701   a  or  701   b.    
       FIG. 22  is a perspective view showing another configuration of the connecting plate similarly to  FIGS. 20 and 21(   a )- 21 ( b ). As shown in  FIG. 22 , it is also possible to provide cutaway section  517  at two positions around the hole  407  of the elastic section  503  of the connecting plate  400 , and form the insulation member  601  so as to fit in the cutaway sections  517  from sides of the connecting plate  400 . Each cutaway section  517  has a tapered shape such that the upper surface of the connecting plate  400  is the widest and becomes narrow as it is close to the lower surface thereof. Forming the insulation member  601  in such shape, the insulation member  601  is engaged and fixed in the thickness direction of the connecting plate  400 , which makes the insulation member  601  hardly come off therefrom. 
     Moreover, it is also possible to obtain similar effects by forming in a shape of a dovetail groove or zigzag (serrate)-shape instead of the tapered shape. In this case, as the connecting plate  400  is pressed down with the central conductive member having a large diameter, the switching spring member  500  is also pressed down by operation of the insulation member  601  and thereby it is possible to shut off the contact between the connecting plate  400  and the changeover switch  500 . 
     More specifically, even in case of the central conductive member without the protrusion  703  as shown in  FIG. 16 , it is possible to shut off the electrical connection between the connecting plate  400  and the switching spring member  500  without directly pressing down the insulation member  601  by the central conductive member  701   a  or  701   b.    
     As shown in  FIGS. 20-22 , in case of pressing the connecting plate  400  to press down the switching spring member  500  via the insulation member  601 , when the elastic section  503  is configured as a plurality of pieces, there is a benefit of pressing down the switching spring member  500  with other piece, even when one of the pieces does not appropriately presses down. 
       FIGS. 18-22  show configuration examples, in which the insulation member  601  is provided on a lower surface of the connecting plate  400  of the coaxial connector, as modification examples, but it is also possible to obtain similar effects even by providing the insulation member  601  on the switching spring member  500  instead of the connecting plate  400 . For example, it is possible to provide the insulation member  601  so as to project on both sides of the elastic section  503  of the switching spring member  500 , such that the switching spring member  500  displaces based on the pressing of the connecting plate  400  and deformation. 
     As shown in Examples of  FIGS. 18-22 , the insulation member  601  can be attached by making a hole on the switching spring member  500  and engaging and fixing the insulation member  601  therein, providing a slope to engage and fix thereto, providing a cutaway section to engage and fix therein, or forming in a shape of dovetail groove or zigzag (serrate)-shape to engage and fix thereto. In addition, as shown in the embodiment of  FIG. 20 , the insulation member  601  on the lower surface side of the switching spring member  500  can be engaged and fixed within the thickness by the dovetail groove shape so as not to protrude from the surface. With those configurations, similarly to Examples of  FIGS. 18-22 , the coaxial plug does not directly contact and press the insulation member, so that it is possible to prevent damage of the insulating material. 
     Therefore, according to the coaxial connector of the above-described embodiment, it is possible to switch among a plurality of terminals, while having a configuration that can attain high productivity, low manufacturing cost, and high durability. In addition, there is no restriction in a rotational angle upon insertion/attachment and the operability is enhanced. In addition, by integrally molding the insulation member, it is possible to attain high productivity. Moreover, it is possible to block space with the insulation member and prevent entrance of dirt. 
     In the above description, the present invention made by the inventors is explained in detail based on the embodiments, but it should be understood that the present invention shall not be limited to those embodiments, and needless to say, can be varied, altered, or modified within scope of the present invention. Furthermore, it is also possible to suitably combine a part of the plurality of embodiments. 
     The coaxial connector having a switch according to the present invention can be applied in a wide variety of industrial areas including information communication device industries, such as cellular phones, smartphones, PDA, and tablet-type personal computers. 
     The disclosure of Japanese Patent Application No. 2013-056270 filed on Mar. 19, 2013, is incorporated in the application by reference. 
     While the invention has been explained with reference to the specific embodiments of the invention, the explanation is illustrative and the invention is limited only by the appended claims.