Patent Publication Number: US-2023155318-A1

Title: Connector assembly and waterproof cap

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to a connector assembly, particularly to a connector assembly in which a waterproof cap closes an insertion port of a housing of an electronic device, into which insertion port, a counter connector is inserted in a fitting process with a connector. 
     The present invention also relates to a waterproof cap that is detachably attached to a housing of an electronic device and closes an insertion port. 
     Conventionally, there have been known a structure in which, in an electronic device in which a connector for connection with an external device is provided in a housing, and an insertion port for inserting a counter connector is formed near the connector in the housing, a cap covers the insertion port of the housing in order to prevent water from entering from the outside to the inside of the housing when the connector is not used. 
     For example, JP 2013-98078 A discloses a mobile terminal in which an insertion port  2  is provided to a housing  1 , and a connector  3  is disposed on the inner side from the insertion port  2  as shown in  FIG.  14   . A counter connector (not shown) is inserted into the insertion port  2  and fitted with the connector  3 , whereby the counter connector can be connected to an external device (not shown) via the connector  3 . The insertion port  2  includes an opening portion  2 A of rectangular shape exposed on a front surface of the housing  1  and a communication hole  2 B of oval shape continuing from the opening portion  2 A and extending to the inside of the housing  1 . 
     For waterproofing, a lid member  4  shown in  FIG.  15    is detachably attached to the insertion port  2 . The lid member  4  includes a front plate portion  4 A of rectangular shape covering the opening portion  2 A of the insertion port  2  and an insertion portion  4 B formed on and protruding from an inner surface of the front plate portion  4 A and inserted into the communication hole  2 B of the insertion port  2 . A recessed portion  5  is formed over an entire periphery of the insertion portion  4 B, and a pair of claw portions  6  are separately formed on opposite end portions of the insertion portion  4 B in a longitudinal direction. 
     As shown in  FIG.  16   , when an O-ring  7  is fitted in the recessed portion  5 , and the insertion portion  4 B is inserted into the communication hole  2 B of the housing  1 , the O-ring  7  contacts an inner peripheral surface  2 C of the communication hole  2 B while being pressurized by the inner peripheral surface  2 C, whereby water is stopped at the insertion port  2 . Further, the claw portion  6  is inserted toward the inner side of the housing  1  than the inner peripheral surface  2 C of the communication hole  2 B, and caught by an edge portion  8  formed on the inner side of the inner peripheral surface  2 C of the communication hole  2 B, resulting in prevention of the lid member  4  from falling off the insertion port  2 . 
     When the lid member  4  is attached to or detached from the insertion port  2 , in order to prevent a situation where the claw portion  6  scratches the inner peripheral surface  2 C of the communication hole  2 B so that the inner peripheral surface  2 C is chipped away, and a water stop effect by the O-ring  7  deteriorates, the edge portion  8  catching the claw portion  6  is formed to protrude toward the inner side of the housing  1  than the inner peripheral surface  2 C of the communication hole  2 B and toward the center side of the communication hole  2 B from the inner peripheral surface  2 C. 
     However, in order to prevent the lid member  4  from falling off the insertion port  2 , the pair of claw portions  6  of the lid member  4  need to be inserted to the inner side of the housing  1  than the inner peripheral surface  2 C of the communication hole  2 B and caught by the edge portion  8 , and in order to prevent the claw portions  6  from scratching the inner peripheral surface  2 C of the communication hole  2 B, the edge portion  8  needs to be formed to protrude toward the inner side of the housing  1  than the inner peripheral surface  2 C of the communication hole  2 B and toward the center side of the communication hole  2 B from the inner peripheral surface  2 C, and there is a problem in that the configuration of the insertion port  2  of the housing  1  and the lid member  4  becomes complicated. 
     Further, there is also a problem in that a space where the claw portion  6  is caught by the edge portion  8  needs to be provided between the insertion port  2  of the housing  1  and the connector  3 . 
     SUMMARY OF THE INVENTION 
     The present invention has been made to overcome such conventional problems and aims at providing a connector assembly with a simple structure, without the need for a large space, and capable of preventing water from penetrating from an insertion port of a housing of an electronic device. 
     The present invention also aims at providing a waterproof cap for preventing water from penetrating from an insertion port of a housing of an electronic device. 
     A connector assembly according to the present invention comprises: 
     a connector fitted to a counter connector along a fitting direction; 
     a housing of an electronic device, the housing accommodating the connector and having an insertion port into which the counter connector is inserted; and 
     a waterproof cap detachably attached from an outside of the housing to the housing and used to close the insertion port, 
     the waterproof cap including: 
     a cap body extending in the fitting direction, 
     a first protruding portion disposed on an outer peripheral surface of the cap body, continuously surrounding an entire periphery of the outer peripheral surface while protruding from the outer peripheral surface in a plane orthogonal to the fitting direction, and made of an elastic material; and 
     a second protruding portion disposed on the outer peripheral surface on a front end side of the cap body in the fitting direction from a position at which the first protruding portion is disposed, protruding from the outer peripheral surface in a direction orthogonal to the fitting direction, and made of an elastic material, 
     wherein when the waterproof cap is attached to the housing, the first protruding portion is press-fitted to the insertion port of the housing and contacts an entire periphery of an inner peripheral surface of the insertion port while being elastically compressed, and the second protruding portion is inserted into the connector and contacts at least two inner surfaces of the connector facing each other while being elastically compressed. 
     A waterproof cap according to the present invention is one that is detachably attached from an outside of a housing of an electronic device to the housing and closes an insertion port, the housing accommodating a connector fitted to a counter connector along a fitting direction and having the insertion port into which the counter connector is inserted, the waterproof cap comprises: 
     a cap body extending in the fitting direction, 
     a first protruding portion disposed on an outer peripheral surface of the cap body, continuously surrounding an entire periphery of the outer peripheral surface while protruding from the outer peripheral surface in a plane orthogonal to the fitting direction, and made of an elastic material; and 
     a second protruding portion disposed on the outer peripheral surface on a front end side of the cap body in the fitting direction from a position at which the first protruding portion is disposed, protruding from the outer peripheral surface in a direction orthogonal to the fitting direction, and made of an elastic member, 
     wherein when the waterproof cap is attached to the housing, the first protruding portion is press-fitted to the insertion port of the housing and contacts an entire periphery of an inner peripheral surface of the insertion port while being elastically compressed, and the second protruding portion is inserted into the connector and contacts at least two inner surfaces of the connector facing each other while being elastically compressed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a perspective view showing a connector assembly according to Embodiment 1 of the present invention. 
         FIG.  2    is a cross-sectional side view showing part of a housing of an electronic device and a connector that are used in Embodiment 1. 
         FIG.  3    is a front view showing part of the housing of the electronic device used in Embodiment 1. 
         FIG.  4    is a cross-sectional view taken along line A-A in  FIG.  3   . 
         FIG.  5    is a perspective view showing a waterproof cap used in Embodiment 1 when viewed obliquely from the rear. 
         FIG.  6    is a perspective view showing the waterproof cap used in Embodiment 1 when viewed obliquely from the front. 
         FIG.  7    is a front view showing the waterproof cap used in Embodiment 1. 
         FIG.  8    is a plan view showing the waterproof cap used in Embodiment 1. 
         FIG.  9    is a side view showing the waterproof cap used in Embodiment 1. 
         FIG.  10    is a cross-sectional view taken along line B-B in  FIG.  8   . 
         FIG.  11    is a perspective view showing the connector assembly according to Embodiment 1 with the waterproof cap being attached to the housing of the electronic device. 
         FIG.  12    is a cross-sectional side view showing the connector assembly according to Embodiment 1 with the waterproof cap being attached to the housing of the electronic device. 
         FIG.  13    is a cross-sectional side view showing a waterproof cap used in Embodiment 2. 
         FIG.  14    is a partial perspective view showing a housing of a conventional mobile terminal. 
         FIG.  15    is a perspective view showing a lid member used in the conventional mobile terminal. 
         FIG.  16    is a partial cross-sectional view showing a state where the lid member is attached to the housing of the conventional mobile terminal. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Embodiments of the present invention are described below with reference to the accompanying drawings. 
     Embodiment 1 
       FIG.  1    shows a perspective view of a connector assembly according to Embodiment 1. The connector assembly includes a housing  11  of an electronic device, a connector  21  accommodated in the housing  11 , and a waterproof cap  31  detachably attached to the housing  11 . 
     The housing  11  of the electronic device is provided with an insertion port  12  of oval shape extending in a predetermined direction, and the connector  21  is disposed at a position facing the insertion port  12  from the inside of the housing  11 . In addition, the connector  21  is to be fitted with a counter connector (not shown) along a fitting direction D, and the counter connector is inserted from the outside of the housing  11  into the housing  11  through the insertion port  12  to be fitted with the connector  21 . Note that part of the housing  11 , at which part the insertion port  12  is provided, extends in a direction orthogonal to the fitting direction D. 
     When a counter connector (not shown) is not fitted with the connector  21  and the connector  21  is not used, the waterproof cap  31  is attached to the housing  11  from the outside of the housing  11  to close the insertion port  12  in order to prevent water from entering the inside of the housing  11  through the insertion port  12 . 
     For convenience, the direction in which a counter connector (not shown) is fitted with the connector  21  along the fitting direction D is referred to as “+Y direction,” the direction orthogonal to the Y direction and in which the insertion port  21  of oval shape of the housing  11  extends is referred to as “X direction,” and the direction perpendicular to an XY plane is referred to as “Z direction.” 
     As shown in  FIG.  2   , the connector  21  is mounted on a circuit board  41  disposed in the housing  11  of the electronic device, and includes at least one connection terminal  22 , an insulator  23  that retains the connection terminal  22 , and a metal shell  24  that encloses the connection terminal  22  and the insulator  23 . 
     The insulator  23  includes a tongue portion  25  projecting in the −Y direction along the fitting direction D, and a −Y directional end portion of the connection terminal  22  is disposed on a surface of the tongue portion  25  and exposed in the +Z direction. A +Y directional end portion of the connection terminal  22  projects in the +Y direction from the insulator  23  and is connected to a connection pad (not shown) disposed on a surface of the circuit board  41 , and a Y directional center portion of the connection terminal  22  is embedded in the insulator  23 . 
     The metal shell  24  has a tubular shape and forms a counter connector accommodating portion  26  of recess shape around the tongue portion  25  of the insulator  23 . The counter connector accommodating portion  26  is a space for accommodating part of a counter connector (not shown) when the counter connector is fitted with the connector  21  along the fitting direction D. 
     The connector  21  is disposed on the +Y direction side of and near the insertion port  12  of the housing  11 , and the counter connector accommodating portion  26  of the metal shell  24  is disposed to face the insertion portion  12  of the housing  11  from the inside of the housing  11 . 
     Note that the metal shell  24  of tubular shape has a pair of inner surfaces  27  and  28  facing each other in the Z direction with the counter connector accommodating portion  26  being sandwiched therebetween, and these inner surfaces  27  and  28  are disposed with a gap S therebetween in the Z direction. 
     As shown in  FIG.  3   , the insertion port  12  of the housing  11  has an inner peripheral surface  13  of oval shape having an X directional length of LOX and a Z directional length of L0Z. 
     In addition, as shown in  FIG.  4   , the inner peripheral surface  13  of the insertion port  12  has a predetermined length LY along the Y direction. 
     The structure of the waterproof cap  31  is shown in  FIGS.  5  and  6   . The waterproof cap  31  includes a cap body  32  extending in the Y direction, a flange portion  33  joined to a −Y directional end portion, that is, a rear end, of the cap body  32 , and further a knob portion  34  joined to a rear end of the flange portion  33 . 
     The cap body  32  has a flattened oval shape corresponding to the insertion port  12  of oval shape of the housing  11  and extending in the X direction when viewed in the Y direction, and is provided in its interior with a recessed portion  35  recessed from a +Y directional end portion, that is, a front end, of the cap body  32  to a rear portion of the cap body  32 . 
     An elastic member  36  is attached to the cap body  32  so as to continuously surround an entire periphery of an outer peripheral surface of the cap body  32 . The elastic member  36  includes a first protruding portion  37  situated at a rear portion on the −Y direction side of the cap body  32 , and a second protruding portion  38  situated on the +Y directional-end-portion side of the cap body  32  from the first protruding portion  37 . The first protruding portion  37  and the second protruding portion  38  both continuously surround the entire periphery of the outer peripheral surface of the cap body  32  while protruding from the outer peripheral surface of the cap body  32  toward the outside of the cap body  32  in an XZ plane orthogonal to the Y direction, and are integrally formed. 
     As shown in  FIG.  7   , the flange portion  33  extends longer than the cap body  32  in the X direction and the Z direction in an XZ plane orthogonal to the Y direction. The flange portion  33  defines a position of the waterproof cap  31  in the Y direction with respect to the housing  11  by abutting an outer surface of the housing  11  when the cap body  32  is inserted into the insertion port  12  of the housing  11  and the waterproof cap  31  is attached to the housing  11  from the outside of the housing  11 . 
     As shown in  FIG.  8   , when viewed in the Z direction, a maximum distance L1X between opposite ends of the first protruding portion  37  continuously surrounding the entire periphery of the outer peripheral surface of the cap body  32  is set to be larger than a maximum distance L2X between opposite ends of the second protruding portion  38  continuously surrounding the entire periphery of the outer peripheral surface of the cap body  32 . 
     In addition, when viewed in the Z direction, a maximum dimension L3X of the flange portion  33  is set to be larger than the maximum distance L1X between the opposite ends of the first protruding portion  37  continuously surrounding the entire periphery of the outer peripheral surface of the cap body  32 . 
     Similarly, as shown in  FIG.  9   , when viewed in the X direction, a maximum distance L1Z between opposite ends of the first protruding portion  37  continuously surrounding the entire periphery of the outer peripheral surface of the cap body  32  is set to be larger than a maximum distance L2Z between opposite ends of the second protruding portion  38  continuously surrounding the entire periphery of the outer peripheral surface of the cap body  32 . 
     In addition, when viewed in the X direction, a maximum dimension L3Z of the flange portion  33  is set to be larger than the maximum distance L1Z between the opposite ends of the first protruding portion  37  continuously surrounding the entire periphery of the outer peripheral surface of the cap body  32 . 
     Note that there is a relation in that the X directional length LOX of the inner peripheral surface  13  of the insertion port  12  of the housing  11  shown in  FIG.  3    is larger than the maximum distance L2X between the opposite ends of the second protruding portion  38 , slightly smaller than the maximum distance L1X between the opposite ends of the first protruding portion  37 , and smaller than the maximum dimension L3X of the flange portion  33 . 
     Similarly, there is a relation in that the Z directional length L0Z of the inner peripheral surface  13  of the insertion port  12  of the housing  11  shown in  FIG.  3    is larger than the maximum distance L2Z between the opposite ends of the second protruding portion  38 , slightly smaller than the maximum distance L1Z between the opposite ends of the first protruding portion  37 , and smaller than the maximum dimension L3Z of the flange portion  33 . 
     Since the X directional length LOX and the Z directional length L0Z of the inner peripheral surface  13  of the insertion port  12  are respectively slightly smaller than the maximum distances L1X and LIZ between the opposite ends of the first protruding portion  37 , when the first protruding portion  37  disposed on the outer peripheral surface of the cap body  32  is press-fitted to the insertion port  12  of the housing  11  in the Y direction, the first protruding portion  37  can contact the entire periphery of the inner peripheral surface  13  of the insertion port  12  while being elastically compressed. 
     The gap S between the pair of inner surfaces  27  and  28  facing each other in the Z direction with the counter connector accommodating portion  26  of the metal shell  24  being sandwiched therebetween as shown in  FIG.  2    is set to be slightly smaller than the maximum distance L2Z between the opposite ends of the second protruding portion  38  when viewed in the X direction. Thus, when the +Y directional end portion of the cap body  32  is inserted into the counter connector accommodating portion  26  of the metal shell  24 , the second protruding portion  38  can contact the pair of inner surfaces  27  and  28  of the metal shell  24  while being elastically compressed. 
     The knob portion  34  joined to the rear end of the flange portion  33  is to be held by a user when the waterproof cap  31  is attached to the housing  11  and when the waterproof cap  31  attached to the housing  11  is pulled out. 
     The cap body  32 , the flange portion  33 , and the knob portion  34  of the waterproof cap  31  as above are integrally formed from an insulating resin, and the elastic member  36  including the first protruding portion  37  and the second protruding portion  38  is made of a rubber material that is an elastic material. 
     As shown in  FIG.  10   , a groove  39  is formed at the outer peripheral surface of the cap body  32  so as to continuously surround the entire periphery of the outer peripheral surface, and the elastic member  36  is fitted or molded in the groove  39  to be thereby attached to the cap body  32 . 
     Note that the recessed portion  35  of the cap body  32  is disposed at a position where the recessed portion  35  overlaps the second protruding portion  38  of the elastic member  36  in the Y direction. 
     Next, the connector assembly in a state where the waterproof cap  31  is attached to the housing  11  is shown in  FIG.  11   . The waterproof cap  31  is attached to the housing  11  from the outside of the housing  11  along the Y direction, the flange portion  33  of the waterproof cap  31  abuts the outer surface of the housing  11 , and the insertion port  12  of the housing  11  is covered with the flange portion  33  and cannot be seen from the outside of the housing  11 . 
     At this time, as shown in  FIG.  12   , the cap body  32  of the waterproof cap  31  is inserted into the insertion port  12  of the housing  11 , and the first protruding portion  37  of the elastic member  36  disposed on the outer peripheral surface of the cap body  32  is press-fitted to the insertion port  12 . Since the X directional length LOX and the Z directional length L0Z of the inner peripheral surface  13  of the insertion port  12  are respectively slightly smaller than the maximum distances L1X and L1Z between the opposite ends of the first protruding portion  37 , the first protruding portion  37  contacts the entire periphery of the inner peripheral surface  13  of the insertion port  12  while being elastically compressed, thereby preventing water from entering the inside of the housing  11  through the insertion port  12 . 
     Since the inner peripheral surface  13  of the insertion port  12  has the predetermined length LY along the Y direction as shown in  FIG.  4   , the first protruding portion  37  contacts the inner peripheral surface  13  of the insertion port  12  in the range of this length LY, thereby preventing water from entering. In other words, even if the flange portion  33  of the waterproof cap  31  does not abut the outer surface of the housing  11 , when the first protruding portion  37  contacts the inner peripheral surface  13  of the insertion port  12  in the range of the predetermined length LY, a waterproof effect can be obtained, and reliable waterproofness can be provided. 
     As shown in  FIG.  12   , when the waterproof cap  31  is attached to the housing  11 , the +Y directional end portion, that is, the front end, of the cap body  32  is inserted to the inside of the counter connector accommodating portion  26  of the metal shell  24  of the connector  21  disposed inside the housing  11 . 
     At this time, since the recessed portion  35  recessed from the front end of the cap body  32  to the rear end of the cap body  32  is formed inside the cap body  32 , the tongue portion  25  projecting in the −Y direction in the counter connector accommodating portion  26  of the connector  21  and the −Y directional end portion of the connection terminal  22  disposed on the surface of the tongue portion  25  are accommodated in the recessed portion  35  of the cap body  32 . Therefore, the waterproof cap  31  can be attached to the housing  11  while the front end of the cap body  32  does not abut the tongue portion  25  and the connection terminal  22 . 
     Note that the recessed portion  35  of the cap body  32  is formed to have a size such that the recessed portion  35  faces the tongue portion  25  and the −Y directional end portion of the connection terminal  22  that are accommodated inside the recessed portion  35  across a gap in each of the Y direction, the Z direction, and the X direction, and does not contact the tongue portion  25  and the connection terminal  22 . 
     In addition, the front end of the cap body  32  is inserted to the inside of the counter connector accommodating portion  26  of the metal shell  24 , whereby the second protruding portion  38 , situated on the front end side of the cap body  32 , of the elastic member  36  disposed on the outer peripheral surface of the cap body  32  is also inserted to the inside of the counter connector accommodating portion  26 . 
     Here, since the gap S between the pair of inner surfaces  27  and  28 , facing each other in the Z direction, of the metal shell  24  is set to be slightly smaller than the maximum distance L2Z between the opposite ends of the second protruding portion  38  when viewed in the X direction, the second protruding portion  38  contacts the inner surfaces  27  and  28  of the metal shell  24  while being elastically compressed and receives a pressing force from the inner surfaces  27  and  28  of the metal shell  24 . 
     Therefore, a holding force of the waterproof cap  31  to hold the housing  11  is improved, and the waterproof cap  31  can be effectively prevented from falling off the housing  11 . 
     Further, since the second protruding portion  38  contacts the pair of inner surfaces  27  and  28  of the metal shell  24  of the connector  21 , a connector assembly that has a simple configuration without forming a dedicated part or portion for receiving the second protruding portion  38  and does not require a large space can be achieved. 
     When a counter connector (not shown) is connected to the connector  21  in the state where the waterproof cap  31  is attached to the housing  11  so that water is prevented from entering the inside of the housing  11  through the insertion portion  12 , the knob portion  34  of the waterproof cap  31  is held, and the waterproof cap  31  is pulled out from the housing  11  toward the −Y direction, whereby the insertion port  12  is released. Therefore, the counter connector can be fitted with the connector  21  disposed inside the housing  11  through the insertion port  12 . 
     While in Embodiment 1 above, the second protruding portion  38  of the waterproof cap  31  contacts the pair of inner surfaces  27  and  28 , facing each other in the Z direction, of the metal shell  24  of the connector  21 , the invention is not limited thereto, and for example, the second protruding portion  38  may be configured to contact a pair of inner surfaces  27  and  28 , facing each other in the X direction, of the metal shell  24  of the connector  21 . 
     It suffices if the second protruding portion  38  of the waterproof cap  31  contacts at least two surfaces, facing each other, of the metal shell  24  while being elastically compressed. In addition, the second protruding portion  38  is not necessarily required to contact the metal shell  24 , and when the second protruding portion  38  contacts at least two surfaces, facing each other, of the inside of the connector  21 , the holding force of the waterproof cap  31  can similarly be improved. 
     Since in Embodiment 1 above, the second protruding portion  38  of the waterproof cap  31  continuously surrounds the entire periphery of the outer peripheral surface of the cap body  32  while protruding from the outer peripheral surface of the cap body  32  toward the outside of the cap body  32 , the second protruding portion  38  may be configured to contact not only the pair of inner surfaces  27  and  28  of the metal shell  24  but also the entire periphery of the inner peripheral surface of the metal shell  24  while being elastically compressed. Therefore, the holding force of the waterproof cap  31  is further improved. 
     In addition, when the second protruding portion  38  of the waterproof cap  31  contacts only the pair of the inner surfaces  27  and  28 , facing each other in the Z direction, of the metal shell  24 , the second protruding portion  38  need not continuously surround the entire periphery of the outer peripheral surface of the cap body  32 , and even with the second protruding portion formed only at portions, facing the +Z direction and the −Z direction, of the outer peripheral surface of the cap body  32 , the holding force of the waterproof cap  31  can similarly be improved. 
     In addition, while the connector  21  has only the connection terminal  22  disposed on the +Z direction side surface of the tongue portion  25 , the connection terminal  22  may be disposed on each of the +Z direction side surface and a −Z direction side surface of the tongue portion  25 . Even in an electronic device in which the connector as above is disposed inside the housing  11 , the waterproof cap  31  is attached to the housing  11 , thereby preventing water from entering the inside of the housing  11  through the insertion port  12 . 
     Embodiment 2 
     While in Embodiment 1 above, the elastic member  36  in which the first protruding portion  37  and the second protruding portion  38  are integrally formed is attached to the outer peripheral surface of the cap body  32  of the waterproof cap  31 , the invention is not limited thereto. 
       FIG.  13    is a cross-sectional view of a waterproof cap  31 A used in a connector assembly according to Embodiment 2. The waterproof cap  31 A includes a cap body  32 A instead of the cap body  32  in the waterproof cap  31  used in Embodiment 1, and instead of the elastic member  36 , a first elastic member  36 A and a second elastic member  36 B are attached to the cap body  32 A. The waterproof cap  31 A otherwise has the same configuration as the waterproof cap  31  in Embodiment 1. 
     The cap body  32 A is provided with a first groove  39 A continuously surrounding an entire periphery of an outer peripheral surface of a rear portion, close to the flange portion  33 , of the cap body  32 A, and a second groove  39 B continuously surrounding an entire periphery of an outer peripheral surface of the cap body  32 A at a position of a +Y direction end portion side of the cap body  32 A from the first groove  39 A. 
     The first elastic member  36 A has a first protruding portion  37 , is made of a rubber material, and is attached to the cap body  32 A by being fitted in the first groove  39 A. Similarly, the second elastic member  36 B has a second protruding portion  38 , is made of a rubber material, and is attached to the cap body  32 A by being fitted in the second groove  39 B. 
     Even when the first protruding portion  37  and the second protruding portion  38  are respectively formed at the dedicated first elastic member  36 A and the dedicated second elastic member  36 B as described above, as with Embodiment 1, water can be prevented from entering the inside of the housing  11  through the insertion port  12  of the housing  11 , and a holding force of the waterproof cap  31 A can be improved, and a connector assembly which has a simple configuration and does not require a large space can be achieved. 
     While the cap body  32 , the flange portion  33 , and the knob portion  34  of the waterproof cap  31  in Embodiment 1 above as well as the cap body  32 A, the flange portion  33 , and the knob portion  34  of the waterproof cap  31 A in Embodiment 2 are made of an insulating resin, these members are configured not to directly contact the connection terminal  22  and the metal shell  24  of the connector  21  and thus can be made of a material having conductivity such as metal.