Patent Publication Number: US-2023134805-A1

Title: Terminal and connector

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the benefit of Japanese Patent Application No. 2021-179174, filed on Nov. 2, 2021, the entire disclosure of which is incorporated by reference herein. 
     FIELD 
     This application relates to a terminal and a connector. 
     BACKGROUND 
     Unexamined Japanese Patent Application Publication No. 2006-004820 discloses a shield terminal for a coaxial cable including an outer conductor, a braided-layer swaging segment to be swaged on a braided layer of a coaxial cable, a sleeve to be inserted inside the braided layer of the coaxial cable and hold the braided layer against the braided-layer swaging segment, and a sheath swaging segment to be swaged on a sheath of the coaxial cable. In the shield terminal for a coaxial cable disclosed in Unexamined Japanese Patent Application Publication No. 2006-004820, the individual segments are formed integrally with each other using the identical member. 
     In the shield terminal for a coaxial cable disclosed in Unexamined Japanese Patent Application Publication No. 2006-004820, the integration of the individual segments is achieved by joints connecting the segments to each other. Unfortunately, this configuration may generate a gap between the segments after assembly of the shield terminal for a coaxial cable to the coaxial cable. This gap causes resonance of signals and other troubles, leading to deterioration of high-frequency characteristics in the shield terminal disclosed in Unexamined Japanese Patent Application Publication No. 2006-004820. 
     An objective of the present disclosure, which has been accomplished under the above situations, is to provide a terminal and a connector that can inhibit deterioration of high-frequency characteristics. 
     SUMMARY 
     In order to achieve the above objective, a terminal according to a first aspect of the present disclosure includes: 
     an outer conductor including a swaging segment; and 
     a sleeve having one end and another end, the one end being disposed in the outer conductor, the other end being disposed inside a coaxial-cable outer conductor of a coaxial-cable, the swaging segment being swaged onto the other end and the coaxial-cable outer conductor. 
     The sleeve may include a first segment disposed inside the coaxial-cable outer conductor and a second segment disposed in the outer conductor. 
     The first segment and the second segment may each have a hollow cylindrical shape, and 
     the first segment may have an outer diameter smaller than an outer diameter of the second segment. 
     The outer conductor may have an inner surface to face an outer peripheral surface of the second segment when the second segment is disposed in the outer conductor, and 
     the outer peripheral surface of the second segment may be at least partially in contact with the inner surface of the outer conductor while the second segment of the sleeve is disposed in the outer conductor. 
     The outer conductor and the sleeve may each include a bent plate member, and 
     the sleeve may have a thickness different from a thickness of the outer conductor. 
     The sleeve may be a component separate from the outer conductor. 
     The coaxial-cable outer conductor may include braided metal wires. 
     A connector according to a second aspect of the present disclosure includes: 
     the terminal according to the first aspect of the present disclosure; and 
     a housing to accommodate the terminal. 
     In the terminal and the connector according to aspects of the present disclosure, one end of the sleeve is inserted in the outer conductor, the other end of the sleeve is inserted inside the coaxial-cable outer conductor, and the swaging segment is swaged onto the other end and the coaxial-cable outer conductor. This configuration can achieve a terminal and a connector that can inhibit deterioration of high-frequency characteristics. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       A more complete understanding of this application can be obtained when the following detailed description is considered in conjunction with the following drawings, in which: 
         FIG.  1    is a perspective view of a connector and a connector unit according to an embodiment of the present disclosure; 
         FIG.  2    is an exploded perspective view of the connector unit; 
         FIG.  3    is a perspective view of a mating connector; 
         FIG.  4    is an exploded top view of the connector unit; 
         FIG.  5    is a sectional view taken along the line V-V of  FIG.  4   ;A 
         FIG.  6    is a sectional view configured by simplifying some parts of  FIG.  5   ; 
         FIG.  7    is a perspective view of a terminal and the mating terminal; 
         FIG.  8    is a first exploded perspective view of a housing and the terminal; 
         FIG.  9 A  is a first perspective view for describing a structure of the terminal; 
         FIG.  9 B  is a second perspective view for describing the structure of the terminal; 
         FIG.  10    is a second exploded perspective view of the housing and the terminal; 
         FIG.  11 A  is a first perspective view for describing a procedure of connecting the terminal and a coaxial cable; 
         FIG.  11 B  is a second perspective view for describing the procedure of connecting the terminal and the coaxial cable; 
         FIG.  11 C  is a third perspective view for describing the procedure of connecting the terminal and the coaxial cable; 
         FIG.  12 A  is a fourth perspective view for describing the procedure of connecting the terminal and the coaxial cable; 
         FIG.  12 B  is a fifth perspective view for describing the procedure of connecting the terminal and the coaxial cable; 
         FIG.  12 C  is a sixth perspective view for describing the procedure of connecting the terminal and the coaxial cable; and 
         FIG.  13    is a seventh perspective view for describing the procedure of connecting the terminal and the coaxial cable. 
     
    
    
     DETAILED DESCRIPTION 
     A terminal  10  according to an embodiment of the present disclosure and a connector  100  including the terminal  10  are described below with reference to the accompanying drawings. In order to facilitate an understanding, XYZ coordinates orthogonal to each other are defined and referred to in the description as appropriate. As illustrated in  FIG.  1   , +Y direction of the XYZ coordinates is identical to a fitting direction D 1  in which the connector  100  shifts to be fitted into a mating connector  200 , which is a partner of the connector  100 . The X-axis directions are identical to the width directions of the connector  100 . The Z-axis directions are identical to the height directions of the connector  100  and orthogonal to both of the X-axis and Y-axis directions. 
     A connector unit  1  is an in-vehicle connector unit serving as an automobile component, for example. As illustrated in  FIGS.  1  and  2   , the connector unit  1  includes the connector  100  and the mating connector  200 , into which the connector  100  is fitted. The connector unit  1  is used to connect a coaxial cable W extending from an electronic component installed in an automobile to an installed device S, which is one of the components installed in the automobile. The installed device S in this embodiment is a circuit board. The installed device S is not necessarily a circuit board and may also be a component other than the circuit board. 
     The mating connector  200  is provided to the installed device S by a through hole reflow technique, and receives the connector  100  therein. As illustrated in  FIGS.  3  and  4   , the mating connector  200  includes a mating housing  201 , retainers  202 R and  202 L, and a mating terminal  203 . 
     The mating housing  201  has a substantially box shape defining a fitting hole  201   a  that is open in the -Y direction and receives the connector  100  therein. The mating housing  201  is made of an insulating material, such as resin. The mating housing  201  is provided with a part of the mating terminal  203  pressed through the rear end face (end face adjacent to the +Y side) of the mating housing  201  and fixed inside the mating housing  201 . The mating housing  201  also has an engaged hole  20  lb. 
     The engaged hole  201   b  extends in the Z-axis directions from the outside of the mating housing  201  to the inside of the fitting hole  201   a  . Although the engaged hole  201   b  in this embodiment is a through hole extending in the Z-axis directions, this configuration is a mere example. The engaged hole  201   b  may also be a hole having a bottom. 
     The retainers  202 R and  202 L are fixed at the mating housing  201  and also fixed at the installed device S. The retainers  202 R and  202 L are made of a metal having a relatively high rigidity, for example. The retainers  202 R and  202 L can achieve firm fixation of the mating housing  201  to the installed device S. 
     The mating terminal  203  includes an inner conductor  203 - 1 , a dielectric element  203 - 2 , and an outer conductor  203 - 3 , which are combined with each other. 
     The inner conductor  203 - 1  is made of an electrically conductive material, for example. Examples of the electrically conductive material include copper and copper alloys. The inner conductor  203 - 1  has a shape of a rod member bent into an L-shape. 
     The dielectric element  203 - 2  is disposed over the inner conductor  203 - 1 . The dielectric element  203 - 2  in this embodiment is formed integrally with the inner conductor  203 - 1  by insert molding. The dielectric element  203 - 2  is made of an insulating material, for example. The dielectric element  203 - 2  has a substantially L-shape. 
     The outer conductor  203 - 3  is disposed over the dielectric element  203 - 2 . The outer conductor  203 - 3  is formed by bending a plate member made of an electrically conductive material. Examples of the electrically conductive material of the plate member include copper and copper alloys. The outer conductor  203 - 3  includes two segments, that is, a main segment  203 - 3   a  and a lid segment  203 - 3   b , which are combined with each other. 
     The main segment  203 - 3   a  is designed to accommodate the dielectric element  203 - 2 , as well as the inner conductor  203 - 1 . The main segment  203 - 3   a  has a substantially hollow cylindrical shape of which the axis extends in the Y-axis directions. 
     The lid segment  203 - 3   b  in this embodiment is a component separate from the main segment  203 - 3   a , and is designed to cover a part of the dielectric element  203 - 2  accommodated in the main segment  203 - 3   a  . The lid segment  203 - 3   b  has a pair of engaging sections  203 - 3   c  . 
     The engaging sections  203 - 3   c  engage with the inside of the mating housing  201  and thereby fix the mating terminal  203  to the mating housing  201 . 
     As illustrated in  FIGS.  5  and  6   , the connector  100  includes the terminal  10  and a housing  90 . 
     The terminal  10  is connected to the coaxial cable W by swaging, as illustrated in  FIG.  7   . 
     As illustrated in  FIG.  8   , the coaxial cable W in this embodiment includes a center conductor W 1 , an insulating element W 2 , a coaxial-cable outer conductor W 3 , and a cover W 4 . 
     The center conductor W 1  is made of an electrically conductive material. The center conductor W 1  propagates high-frequency signals. 
     The insulating element W 2  is made of an insulating material. The insulating element W 2  is disposed between the center conductor W 1  and the coaxial-cable outer conductor W 3  so as to cover the center conductor W 1 . 
     The coaxial-cable outer conductor W 3  is made of an electrically conductive material. The coaxial-cable outer conductor W 3  is a braided layer formed by braiding metal wires, for example. 
     The cover W 4  is made of an insulating material. The cover W 4  is disposed over the center conductor W 1 , the insulating element W 2 , and the coaxial-cable outer conductor W 3 , and thereby protect these components. 
     As illustrated in  FIG.  8   , the terminal  10  includes an outer conductor  20 , a sleeve  30 , a dielectric element  40 , and a central terminal  50 . 
     The outer conductor  20  is electrically connected to the coaxial-cable outer conductor W 3  of the coaxial cable W. The outer conductor  20  serves as a ground terminal for efficient propagation of high-frequency signals in the central terminal  50 . The outer conductor  20  prevents high-frequency signals from leaking to the outside of the coaxial cable W and the terminal  10  and blocks radio waves from the outside. The outer conductor  20  is formed by bending a plate member made of an electrically conductive material, for example. Examples of the electrically conductive material of the plate member include copper and copper alloys. The outer conductor  20  includes a main segment  20   a , as illustrated in  FIGS.  8  and  9   . The outer conductor  20  also includes a first swaging segment  21  and a second swaging segment  22 . 
     The main segment  20   a  has a hollow cylindrical shape of which the axis extends in the Y-axis directions. The main segment  20   a  has a hollow cylindrical end  20   c  adjacent to the +Y side having warping segments that can warp in radial directions (directions orthogonal to the Y-axis directions). When the hollow cylindrical end  20   c  receives the outer conductor  203 - 3  of the mating terminal  203  therein, this warping mechanism brings the hollow cylindrical end  20   c  into contact with the outer peripheral surface of the outer conductor  203 - 3 . This contact causes the outer conductor  20  of the terminal  10  to be electrically connected to the outer conductor  203 - 3  of the mating terminal  203 . The main segment  20   a  also has a protrusion  20   d  for defining the insertion direction, which is designed to define the direction of insertion of the outer conductor  20  to the housing  90 , and engaged sections  20   e , which are through holes extending in radial directions. 
     The first swaging segment  21  (swaging segment) is swaged onto the coaxial-cable outer conductor W 3 . The swaging of the first swaging segment  21  onto the coaxial-cable outer conductor W 3  causes the outer conductor  20  to be electrically connected to the coaxial-cable outer conductor W 3 . The first swaging segment  21  extends from the end of the main segment  20   a  adjacent to the -Y side. The end of the first swaging segment  21  adjacent to the −Y side adjoins the second swaging segment  22  extending therefrom. 
     The second swaging segment  22  is swaged onto the cover W 4 . The swaging of the second swaging segment  22  onto the cover W 4  causes the terminal  10  to be rigidly fixed to the coaxial cable W. 
     The sleeve  30  has a shape having two hollow cylindrical segments having different outer diameters. The sleeve  30  is a member separate from the outer conductor  20 . The sleeve  30  is formed by bending a plate member made of an electrically conductive material, for example. Examples of the electrically conductive material of the plate member include copper and copper alloys. The sleeve  30  in this embodiment has a thickness different from the thickness of the outer conductor  20 . The end of the sleeve  30  adjacent to the +Y side is inserted in the main segment  20   a  of the outer conductor  20 , and the end of the sleeve  30  adjacent to the -Y side is inserted inside the coaxial-cable outer conductor W 3 . After insertion of the end of the sleeve  30  adjacent to the −Y side inside the coaxial-cable outer conductor W 3 , the first swaging segment  21  is swaged onto this end together with the coaxial-cable outer conductor W 3 . The sleeve  30  includes a first segment  31  corresponding to the end adjacent to the −Y side and a second segment  32  corresponding to the end adjacent to the +Y side. The second segment  32  corresponding to the end of the sleeve  30  adjacent to the +Y side is preliminarily inserted in the outer conductor  20  at the time of assembly of the terminal  10 . This feature can improve the efficiency of assembly of the terminal  10 . 
     The first segment  31  is configured to be inserted inside the coaxial-cable outer conductor W 3 , in detail, inserted between the insulating element W 2  and the coaxial-cable outer conductor W 3 . The first segment  31  has a hollow cylindrical shape. 
     The second segment  32  is configured to be inserted in the main segment  20   a  of the outer conductor  20 . The second segment  32  has a hollow cylindrical shape. The second segment  32  has an outer diameter A 2  larger than an outer diameter A 1  of the first segment  31  (A 2 &gt;A 1 ). While the second segment  32  is disposed in the outer conductor  20 , an outer peripheral surface  32   a  of the second segment  32  is at least partially in contact with an inner surface  20   b  of the outer conductor  20 . The outer peripheral surface  32   a  of the second segment  32  has a stopper  32   b , engaging sections  32   c , and an engaging section  32   d.    
     The stopper  32   b  protrudes from the outer peripheral surface  32   a  of the second segment  32 . The stopper  32   b  comes into contact with a part of the outer conductor  20  when the sleeve  30  is inserted in the outer conductor  20 , and thereby determining the position of the sleeve  30  in the Y-axis directions relative to the outer conductor  20 . 
     The engaging sections  32   c  protrude from the outer peripheral surface  32   a  of the second segment  32 . The engaging sections  32   c  engage with the respective engaged sections  20   e  of the main segment  20   a  of the outer conductor  20 . 
     The engaging section  32   d  serves to fix the dielectric element  40  to the sleeve  30 . The engaging section  32   d  has a free end and extends in the Y-axis directions. The engaging section  32   d  is inclined toward the central axis of the sleeve  30  such that the distal end of the engaging section  32   d  can catch the dielectric element  40 . 
     The dielectric element  40  serves to match the characteristic impedances of transmission lines and achieve efficient propagation of high-frequency signals in the central terminal  50 . The dielectric element  40  has a shape having two hollow cylindrical segments having different outer diameters. The dielectric element  40  receives the central terminal  50  fitted therein. 
     As illustrated in  FIGS.  8  and  10   , the central terminal  50  is swaged and fixed onto the center conductor W 1  of the coaxial cable W and thereby electrically connected to the center conductor W 1 , so that the central terminal  50  and the center conductor W 1  propagate high-frequency signals. The central terminal  50  and the dielectric element  40  are disposed inside the sleeve  30 , as illustrated in  FIG.  6   . The central terminal  50  has an end adjacent to the +Y side, which includes a pair of elastic contact segments to hold the inner conductor  203 - 1  therebetween and thus be electrically connected to the inner conductor  203 - 1 . 
     As illustrated in  FIG.  2   , the housing  90  is shaped so as to be fitted in the fitting hole  201   a  of the mating housing  201  of the mating connector  200 . The housing  90  is made of an insulating material, such as resin. The housing  90  includes an engaging section  91 , a support arm  92 , an operative tab  93 , and a through hole  94 . 
     The engaging section  91  engages with the engaged hole  201   b  of the mating housing  201  of the mating connector  200  and thereby fixes the housing  90  to the mating connector  200 . The engaging section  91  protrudes from the support arm  92  in the +Z direction. 
     The support arm  92  extends from the end of the housing  90  adjacent to the +Y end in the rearward direction (−Y direction). The support arm  92  is configured to warp in accordance with the progress of fitting of the connector  100  into the mating connector  200 . 
     The operative tab  93  is mounted on the support arm  92 . The operative tab  93  is manipulated by an operator who is going to detach the connector  100  from the mating connector  200 . The operative tab  93  is allowed to shift in the Z-axis directions by warping of the support arm  92 . The operative tab  93  shifted in the -Z direction disengages the engaging section  91  from the engaged hole  20  lb. 
     As illustrated in  FIGS.  8  and  10   , the through hole  94  is an opening into which the terminal  10  and the coaxial cable W are inserted. The through hole  94  extends in the Y-axis directions. 
     A procedure of connecting the terminal  10  having the above-described configuration and the coaxial cable W (that is, a swaging procedure) is described with reference to  FIGS.  11  to  13    . This procedure of connecting the terminal  10  and the coaxial cable W is carried out by not only an operator himself or herself but also an automatic machine as appropriate, which serves to combine the sleeve  30  and the dielectric element  40  with the outer conductor  20 . 
     The operator first prepares the coaxial cable W, as illustrated in  FIGS.  11 A and  11 B . The operator then peels or removes the cover W 4 , the coaxial-cable outer conductor W 3 , and the insulating element W 2  at the end of the coaxial cable W adjacent to the +Y side, so that the coaxial-cable outer conductor W 3 , the insulating element W 2 , and the center conductor W 1  are exposed to the outside. The operator then swages and fixes the central terminal  50  onto the center conductor W 1 , as illustrated in  FIG.  11 C . The central terminal  50  is thus electrically connected to the center conductor W 1  of the coaxial cable W. 
     The outer conductor  20 , the sleeve  30 , and the dielectric element  40  prepared as illustrated in  FIG.  12 A  are then subject to the following steps. The dielectric element  40  is inserted and fitted into the sleeve  30 , as illustrated in  FIG.  12 B , by the automatic machine, for example. Then, the one end of the sleeve  30 , in which the dielectric element  40  is fitted, is inserted into the outer conductor  20 , as illustrated in  FIG.  12 C , by the automatic machine, for example. The operator can thus obtain the outer conductor  20  in which the dielectric element  40  is installed and the one end of the sleeve  30  is preliminarily inserted (that is, the member illustrated in  FIG.  12 C ). 
     The operator then inserts the coaxial cable W, onto which the central terminal  50  is swaged, into the outer conductor  20  in which the one end of the sleeve  30  is preliminarily inserted, as illustrated in  FIG.  13   . The operator then swages the first swaging segment  21  and the second swaging segment  22 , thereby completing the connection between terminal  10  and the coaxial cable 
     W. Although the above-described procedure for connecting the terminal  10  and the coaxial cable W involves steps carried out by the operator himself or herself and steps executed by the automatic machine, this configuration is a mere example. For example, although the step of inserting the sleeve  30  into the outer conductor  20  illustrated in  FIG.  12 B  is executed by the automatic machine, this configuration is a mere example, and this step may also be carried out by the operator himself or herself. Alternatively, all the steps of the above-described procedure for connecting the terminal  10  and the coaxial cable W may be carried out by the operator, or may be executed by the automatic machine. The steps of the procedure for connecting the terminal  10  and the coaxial cable W can be shared by the operator himself or herself and the automatic machine as appropriate. 
     As described above, in the terminal  10  according to this embodiment, the end of the sleeve  30  adjacent to the +Y side is preliminarily inserted in the outer conductor  20 , as illustrated in  FIG.  9   . The end of the sleeve  30  adjacent to the −Y side is inserted inside the coaxial-cable outer conductor W 3 , and the first swaging segment  21  is swaged onto this end together with the coaxial-cable outer conductor W 3 . This configuration rarely generates a gap between the sleeve  30  of the terminal  10  and the coaxial-cable outer conductor W 3  of the coaxial cable W. The configuration can therefore prevent signals propagating in the terminal  10  and the coaxial cable W from resonating due to the gap between the components of the terminal  10  and the coaxial cable W. The configuration can accordingly achieve the terminal  10  capable of inhibiting deterioration of high-frequency characteristics. 
     In this embodiment, the end of the sleeve  30  adjacent to the +Y side is preliminarily inserted in the outer conductor  20 . The coaxial cable W, onto which the central terminal  50  is swaged, is then inserted in the outer conductor  20 , in which the end of the sleeve  30  adjacent to the +Y side is preliminarily inserted. This configuration can improve the efficiency of the procedure for connecting the terminal  10  and the coaxial cable W. 
     The above-described embodiment is not to be construed as limiting the scope of the present disclosure. 
     For example, although the sleeve  30  in the above-described embodiment includes the first segment  31  to be inserted inside the coaxial-cable outer conductor W 3  and the second segment  32  to be inserted in the main segment  20   a  of the outer conductor  20  as illustrated in  FIG.  9   , the sleeve  30  may also have another shape or structure. The sleeve  30  may include not only the first segment  31  and the second segment  32  but also another segment other than the first segment  31  and the second segment  32 . For example, the sleeve  30  may include a third segment having a hollow cylindrical shape between the first segment  31  and the second segment  32 . The third segment in this example has an outer diameter different from the outer diameter Al of the first segment  31  and the outer diameter A 2  of the second segment  32 . 
     Although the first segment  31  and the second segment  32  in the above-described embodiment each have a hollow cylindrical shape, the first segment  31  and the second segment  32  may also have another shape or structure. For example, one or both of the first segment  31  and the second segment  32  may have a hollow truncated-cone shape inclined in the Y-axis directions. Alternatively, the first segment  31  and the second segment  32  may have a shape other than the hollow cylindrical shape and the hollow truncated-cone shape. 
     Although the outer diameter A 1  of the first segment  31  is smaller than the outer diameter A 2  of the second segment  32  in the above-described embodiment, this configuration is a mere example. The outer diameter A 1  of the first segment  31  may also be identical to the outer diameter A 2  of the second segment  32  (A 1 =A 2 ), or larger than the outer diameter A 2  of the second segment  32  (A 1 &gt;A 2 ). 
     Although the outer peripheral surface  32   a  of the second segment  32  of the sleeve  30  is partially in contact with the inner surface  20   b  of the outer conductor  20  while the second segment  32  is disposed in the outer conductor  20  in the above-described embodiment, this configuration is a mere example. The outer peripheral surface  32   a  of the second segment  32  of the sleeve  30  may also be entirely in contact with the inner surface  20   b  of the outer conductor  20  while the second segment  32  is disposed in the outer conductor  20 . 
     Although the sleeve  30  has a thickness different from the thickness of the outer conductor  20  in the above-described embodiment, this configuration is a mere example. The sleeve  30  may also have a thickness identical to the thickness of the outer conductor  20 . 
     Although the coaxial-cable outer conductor W 3  is formed by braiding metal wires in the above-described embodiment, this configuration is a mere example. The coaxial-cable outer conductor W 3  may also have another shape provided that the coaxial-cable outer conductor W 3  is electrically conductive. 
     The foregoing describes some example embodiments for explanatory purposes. Although the foregoing discussion has presented specific embodiments, persons skilled in the art will recognize that changes may be made in form and detail without departing from the broader spirit and scope of the invention. Accordingly, the specification and drawings are to be regarded in an illustrative rather than a restrictive sense. This detailed description, therefore, is not to be taken in a limiting sense, and the scope of the invention is defined only by the included claims, along with the full range of equivalents to which such claims are entitled. 
     REFERENCE SIGNS LIST 
       1  Connector unit 
       10  Terminal 
       20  Outer conductor 
       20   a  Main segment 
       20   b  Inner surface 
       20   c  Hollow cylindrical end 
       20   d  Protrusion for defining the insertion direction 
       20   e  Engaged section 
       21  First swaging segment (swaging segment) 
       22  Second swaging segment 
       30  Sleeve 
       31  First segment 
       32  Second segment 
       32   a  Outer peripheral surface 
       32   b  Stopper 
       32   c ,  32   d  Engaging section 
       40  Dielectric element 
       50  Central terminal 
       90  Housing 
       91  Engaging section 
       92  Support arm 
       93  Operative tab 
       94  Through hole 
       100  Connector 
       200  Mating connector 
       201  Mating housing 
       201   a  Fitting hole 
       201   b  Engaged hole 
       202 R,  202 L Retainer 
       203  Mating terminal 
       203 - 1  Inner conductor 
       203 - 2  Dielectric element 
       203 - 3  Outer conductor 
       203 - 3   a  Main segment 
       203 - 3   b  Lid segment 
       203 - 3   c  Engaging section 
     W Coaxial cable 
     W 1  Center conductor 
     W 2  Insulating element 
     W 3  Coaxial-cable outer conductor 
     W 4  Cover 
     S Installed device 
     D 1  Fitting direction 
     A 1 , A 2  Outer diameter