connector

Abstract

Provided is a connector capable of improving the holding performance of a die-cast outer conductor to a housing. The connector (10) includes: an electrically conductive inner conductor (11); a die-cast outer conductor (13) that surrounds the inner conductor (11); an insulating housing (14) that mounts the outer conductor (13); and a connecting member (15) that connects the outer conductor (13) and the housing (14) to each other.

Description

Technical Field

[0001] This disclosure relates to connectors. Background Technology

[0002] The connector described in Patent Document 1 includes an inner conductor, referred to as an inner conductor portion, a contact body, a plug body, and a housing, referred to as a coated housing.

[0003] The housing is made of synthetic resin. The inner conductor, contact body, and plug body are made of metal. The plug body is die-cast. The contact body and plug body are assembled together to form the outer conductor. The outer conductor surrounds the outer periphery of the inner conductor. The contact body is cylindrical and inserted into the plug body from the housing. The plug body is mounted relative to the housing in a direction intersecting the insertion direction of the contact body. The contact body is fixed to the plug body by brazing, welding, or other methods. Technology relating to such connectors is also disclosed in Patent Documents 2-6.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2019-71272 (Figures 12-14)

[0007] Patent Document 2: Japanese Patent Application Publication No. 2019-12635

[0008] Patent Document 3: Japanese Patent Application Publication No. 2019-3856

[0009] Patent Document 4: Japanese Patent Application Publication No. 2004-241385

[0010] Patent Document 5: Japanese Patent Application Publication No. 2003-197327

[0011] Patent Document 6: Japanese Patent Application Publication No. 6-60943 Summary of the Invention

[0012] The problem that the invention aims to solve

[0013] However, it is sometimes impossible to provide an elastic locking part that resiliently engages with the housing on a die-cast outer conductor. In contrast, although an elastic locking part can be provided on a housing made of synthetic resin, there is a concern that the elastic locking part may break. Therefore, a simple locking structure that presses the outer conductor into the housing or the like must be used, which raises concerns about the reliability of maintaining the outer conductor.

[0014] Therefore, this disclosure aims to provide a connector capable of improving the retention performance of the die-cast outer conductor towards the housing.

[0015] Solution for solving the problem

[0016] The connector disclosed herein comprises: a conductive inner conductor; a die-cast outer conductor surrounding the inner conductor; an insulating housing for mounting the outer conductor; and a connecting member for connecting the outer conductor and the housing to each other.

[0017] Invention Effects

[0018] According to this disclosure, a connector capable of improving the retention performance of the die-cast outer conductor towards the housing can be provided. Attached Figure Description

[0019] Figure 1 This is a bottom view of the connector in this embodiment.

[0020] Figure 2 yes Figure 1 A sectional view along line AA.

[0021] Figure 3 This is a 3D view of the connector.

[0022] Figure 4 It is a perspective view showing the state before the outer conductor and housing are assembled into structural components.

[0023] Figure 5 This is a perspective view showing the state of the housing before the outer conductor is assembled.

[0024] Figure 6 It is a three-dimensional view of the first dielectric with the first inner conductor installed.

[0025] Figure 7 It is a three-dimensional view of the second dielectric with the second inner conductor installed.

[0026] Figure 8 This is a bottom view of the outer conductor.

[0027] Figure 9 This is a rear view of the outer conductor.

[0028] Figure 10 This is a bottom view of the casing.

[0029] Figure 11 This is the rear view of the casing.

[0030] Figure 12 This is the rear view of the connecting structural component.

[0031] Figure 13 This is a side view of the connecting structural component. Detailed Implementation

[0032] [Description of embodiments of this disclosure]

[0033] First, the implementation methods of this disclosure are listed and explained.

[0034] The connector disclosed herein,

[0035] (1) It comprises: an inner conductor that is conductive; an outer conductor that is die-cast and surrounds the inner conductor; an insulating housing that mounts the outer conductor; and a connecting member that connects the outer conductor and the housing to each other.

[0036] Based on the above configuration, the die-cast outer conductor and the shell are connected to each other by means of connecting components, thus improving the retention performance of the outer conductor to the shell.

[0037] (2) Preferably, the housing has a retaining recess and the connecting member has a retaining protrusion that is embedded in the retaining recess, the retaining recess and the retaining protrusion being formed in a direction that extends in a direction that intersects the mounting direction of the outer conductor relative to the housing.

[0038] Based on the above configuration, it is possible to prevent the connecting structural components and the housing from detaching from each other.

[0039] (3) Preferably, the inner conductor has a lead-out portion located on the back side of the outer conductor, and the connecting member is conductive and has a back shielding portion that covers the lead-out portion from the back side.

[0040] According to the above configuration, the lead-out portion of the inner conductor is covered by the back shielding portion and does not expose to the back side. In this way, when the connecting components have shielding performance, it is not necessary to provide a dedicated shielding cover or the like to seal the back of the housing, which simplifies the overall configuration.

[0041] (4) Preferably, the inner conductor is connected to the circuit board, and the connecting member has a bottom configured to be sandwiched between the outer conductor and the circuit board.

[0042] Based on the above configuration, the bottom can remain between the outer conductor and the circuit board, and without setting a special locking structure, the connector component can be prevented from detaching from the outer conductor when the connector is set on the circuit board.

[0043] (5) Preferably, the connecting member is conductive, and the bottom of the connecting member has an opening that surrounds the entire periphery of the inner conductor.

[0044] Based on the above configuration, by placing the inner conductor inside the opening at the bottom, the shielding performance can be improved, and impedance matching can be achieved.

[0045] [Details of the embodiments of this disclosure]

[0046] The following is a reference to the appendix. Figure 1Specific examples of embodiments of this disclosure will be described below. Furthermore, the invention is not limited to these examples, but is intended to include all modifications within the meaning and scope of the claims, as indicated by the claims.

[0047] Regarding the connector 10 in this embodiment, as follows: Figure 2 As shown, a connector for a circuit board is illustrated and mounted on the circuit board 100. For example... Figure 1 and Figure 2 As shown, connector 10 includes an inner conductor 11, a dielectric body 12, an outer conductor 13, a housing 14, and a connecting member 15. The housing 14 can be mated with a counterpart connector (not shown). Furthermore, in the following description, the side that mats with the counterpart connector is referred to as the front side in the front-rear direction. Figure 1 and Figure 2 The right side is the front side. Regarding the vertical direction, the side of the circuit board 100 relative to the position of the connector 10 is defined as the lower side. Figures 2-7 , Figure 9 , Figure 11 as well as Figure 13 The up and down directions are called the up and down directions.

[0048] <Inner conductor>

[0049] The inner conductor 11 is made of a conductive metal plate, such as Figure 2 As shown, it is formed in an elongated manner. The inner conductor 11 has a lead-out portion 16 extending in the vertical direction and an extension portion 17 extending forward from the upper end of the lead-out portion 16. The lower end of the lead-out portion 16 is inserted into a through hole 101 of the circuit board 100 and soldered to a conductive portion of the circuit board 100 for connection. The front end of the extension portion 17 is connected to a counterpart inner conductor (not shown) when engaged with a counterpart connector. In this embodiment, the inner conductor 11 is composed of a first inner conductor 11A and a second inner conductor 11B with a length shorter than the first inner conductor 11A.

[0050] <Dielectric>

[0051] The dielectric 12 is made of an insulating synthetic resin material and is formed as a whole in an L-shape when viewed from the side. For example... Figure 6 and Figure 7 As shown, the dielectric 12 has a terminal extension portion 18 extending in the vertical direction and a terminal mounting portion 19 extending forward from the upper end of the terminal extension portion 18. Figure 2 As shown, a mounting hole 21 extending through the terminal mounting portion 19 in the front-to-back direction is formed. The extension 17 of the inner conductor 11 is inserted into the mounting hole 21 from the rear. Figure 6 and Figure 7As shown, an extension groove 22 extending in the vertical direction is formed in the terminal extension portion 18. The extension groove 22 opens on the rear surface and the lower surface of the dielectric body 12. The upper end of the extension groove 22 communicates with the rear end of the mounting hole 21. The lead-out portion 16 of the inner conductor 11 is arranged along the extension groove 22. In this embodiment, the dielectric body 12 consists of a first dielectric body 12A (refer to...) Figure 6 ) and a smaller second dielectric 12B that is shorter than the first dielectric 12A (see reference) Figure 7 The first inner conductor 11A is mounted on the terminal mounting portion 19 of the first dielectric 12A. The second inner conductor 11B is mounted on the terminal mounting portion 19 of the second dielectric 12B.

[0052] <External Conductor>

[0053] The outer conductor 13 is conductive, for example, a die-cast component made of a zinc alloy, etc. Figure 9 As shown, four insertion holes 23 are formed through the outer conductor 13 in a front-to-back direction. The four insertion holes 23 are formed in pairs on the upper and lower parts of the outer conductor 13, respectively. Each insertion hole 23 is open at the rear of the outer conductor 13. The dielectric 12 is inserted into each insertion hole 23 from the rear.

[0054] like Figure 5 As shown, four cylinders 24 are formed at the front of the outer conductor 13. Figure 5 The diagram shows a connecting section 25 formed by connecting three cylinders 24) together. Figure 2 As shown, the front part of each insertion hole 23 is formed inside each cylinder 24 of the connecting cylinder portion 25.

[0055] like Figure 9 As shown, a surrounding portion 26 is formed at the rear of the outer conductor 13, and the surrounding portion 26, after its formation, has a gate-like shape. The surrounding portion 26 has an upper portion 27 and a lower portion 28. The upper portion 27 is located at the top of the outer conductor 13, and the lower portion 28 is connected to the upper portion 27 in a stepped manner, located at the bottom of the outer conductor 13. The upper portion 27 and the lower portion 28 are connected in a stepped manner. Figure 8 As shown, the rear surface of the upper layer 27 is arranged to be recessed forward than the rear end of the surrounding layer 26. The rear surface of the lower layer 28 is also arranged to be recessed forward than the rear surface of the upper layer 27. Figure 2 As shown, an insertion hole 23 for the upper portion of the outer conductor 13 is formed through the upper layer 27. An insertion hole 23 for the lower portion of the outer conductor 13 is formed through the lower layer 28. Furthermore, as... Figure 8 and Figure 9As shown, multiple fitting receiving portions 29 are formed in the upper layer 27 and the lower layer 28, respectively. Each fitting receiving portion 29 is formed in a convex or concave shape extending in the front-rear direction. Within the surrounding portion 26, a holding space 31 is formed below each of the upper layer 27 and the lower layer 28. The holding space 31 is open at the rear and bottom of the surrounding portion 26. Figure 1 and Figure 2 As shown, the connecting member 15 is inserted from below into the retaining space 31 of the enclosure 26.

[0056] At the lower ends of the left and right sidewalls of the enclosure 26, a pair of legs 32 are formed protruding downwards at the front and rear. Each leg 32 is inserted into a positioning hole 102 of the circuit board 100. Thus, the connector 10 is configured to be positioned on the circuit board 100.

[0057] <Shell>

[0058] The housing 14 is made of an insulating synthetic resin material and has a base 33 and a cover 34, such as Figure 11 As shown, the base 33, after being formed, is considered to have a rectangular shape, such as... Figure 2 As shown, the cover portion 34 protrudes forward from the base portion 33. A fitting space 35 is formed within the cover portion 34. A matching connector (not shown) is fitted into the fitting space 35 of the cover portion 34 from the front.

[0059] like Figure 11 As shown, a through hole 36 is formed in the base 33, extending through the entire length in the front-rear direction. The through hole 36 has a cross-sectional shape corresponding to the outer shape of the connecting cylindrical portion 25 of the outer conductor 13, and communicates with the fitting space 35. Figure 2 As shown, the connecting tube portion 25 of the outer conductor 13 is configured to protrude into the fitting space 35 through the through hole 36.

[0060] like Figure 10 As shown, a pair of guide portions 37 are formed on the left and right sides of the base 33. Each guide portion 37 is formed as a rib extending in the vertical direction and has opposing surfaces 38 facing each other on the left and right sides. Figure 10 As shown, a pair of retaining recesses 39 are formed on the opposing surfaces 38 of each guide portion 37. Each retaining recess 39 extends vertically along each guide portion 37, and its lower end opens on the lower surface of the base 33. Figure 1 As shown, each retaining protrusion 44 of the connecting member 15, described later, is inserted into each retaining recess 39.

[0061] <Connecting Components>

[0062] Connecting structural component 15 is conductive, for example, a die-cast component made of zinc or a zinc alloy. Figure 4 , Figure 12 and Figure 13As shown, the connecting member 15 has a bottom 41, a back cover 42 connected to the rear end of the bottom 41, an end wall 43 connected to the front end of the bottom 41, and a pair of left and right retaining protrusions 44 connected to the left and right ends of the end wall 43.

[0063] like Figure 3 and Figure 4 As shown, the back cover 42, after being formed, has a rectangular shape. Figure 2 As shown, the bottom 41 has a high-height portion 45 that can contact the upper layer 27 of the outer conductor 13, and a low-height portion 46 that can contact the lower layer 28 of the outer conductor 13. Figure 13 As shown, the higher section 45 is connected to the rear shielding section 42. The lower section 46 is lower than the higher section 45 and is connected to the front end of the higher section 45 in a stepped manner. Figure 12 and Figure 13 As shown, multiple fitting portions 47 are formed on the upper surfaces of the back cover shielding portion 42, the low-height portion 46, and the high-height portion 45. Each fitting portion 47 is formed in a concave or convex shape extending in the front-rear direction, and can be fitted into each fitting receiving portion 29 of the outer conductor 13 in a concave-convex manner. In this embodiment, the concave fitting portion 47 is formed on the back cover shielding portion 42, and the convex fitting portion 47 is formed on the low-height portion 46 and the high-height portion 45.

[0064] like Figure 1 and Figure 12 As shown, four openings 48 are formed vertically through the bottom 41. Each opening 48 is rectangular in shape when viewed from below, and is formed in pairs on the lower height portion 46 and the higher height portion 45. Dielectric elements 12 are inserted into each opening 48. Figure 2 As shown, the second dielectric 12B is inserted into the opening 48 of the low-height portion 46, and the first dielectric 12A is inserted into the opening 48 of the high-height portion 45.

[0065] like Figure 13 As shown, a plurality of ribs 49 extending elongated in the vertical direction are formed on the outer surface of the connecting member 15. Each rib 49 is arranged at intervals in the front-rear direction on the left and right sides of the rear shielding portion 42, the high-height portion 45 and the low-height portion 46 respectively.

[0066] like Figure 12 As shown, each rib 49 is also formed on the inner surface side of the connecting member 15. Specifically, each rib 49 is formed on the left and right sides of each fitting portion 47. Each rib 49 formed on the outer surface of the connecting member 15 can contact the inner surface of the retaining space 31 (see reference). Figure 1 Each rib 49 formed on the inner surface of the connecting structural member 15 can contact the fitting receiving part 29.

[0067] The end wall portion 43 is inserted between the guide portions 37 in the base portion 33. A pair of left and right retaining protrusions 44 are formed at the left and right ends of the end wall portion 43, respectively. Specifically, each retaining protrusion 44 has a rectangular cross-section and is formed in a manner that extends in the vertical direction. Each retaining protrusion 44 is inserted into each retaining recess 39. Figure 4 As shown, each retaining protrusion 44 is formed in a U-shape so as to ensure its own strength, with its width gradually increasing towards the end wall portion 43.

[0068] like Figure 1 As shown, a protruding end 51 is formed on the lower surface of the connecting member 15. The protruding end 51 is composed of a peripheral portion 52 and a supporting end 53. The peripheral portion 52 extends in a manner that surrounds the periphery of each opening 48, and the supporting end 53 has a pair on each side, separated by the peripheral portion 52. Figure 2 As shown, the lower surface of the protruding end 51 is formed flat and disposed on the surface of the circuit board 100.

[0069] <Connector Assembly Structure and Function>

[0070] like Figures 5-4 As shown, the connecting sleeve 25 of the outer conductor 13 is inserted from the rear into the through hole 36 of the base 33 of the housing 14. The rear part of the connecting sleeve 25 is secured by a press-in rib 54 formed on the inner surface of the through hole 36 (see reference). Figure 5 and Figure 11 It is pressed into the through hole 36 of the housing 14 and held in place by the primary.

[0071] like Figure 6 and Figure 7 As shown, the extension 17 of the inner conductor 11 is inserted from the rear into the mounting hole 21 of the terminal mounting portion 19 of the dielectric 12. The rear portion of the extension 17 is secured by a press-in protrusion 55 (see reference). Figure 2 It is pressed into the mounting hole 21 of the dielectric 12 and held in place.

[0072] like Figure 4 As shown, the dielectric 12 is inserted into the insertion hole 23 of the outer conductor 13 from the rear. The terminal mounting portion 19 of the dielectric 12 is secured by a protrusion 56 (see reference). Figure 6 and Figure 7 It is pressed into the insertion hole 23 of the outer conductor 13 and held in place. Figure 2 As shown, the front end of the extension 17 of the inner conductor 11 is configured to protrude into the insertion hole 23 of the connecting tube portion 25.

[0073] Furthermore, the order of the assembly process of the outer conductor 13 relative to the housing 14, the assembly process of the inner conductor 11 relative to the dielectric 12, and the assembly process of the dielectric 12 relative to the outer conductor 13 is not particularly limited and can be arbitrary.

[0074] likeFigures 4-3 As shown, starting from the state where the outer conductor 13 is initially held in the housing 14, the connecting member 15 is installed from below, intersecting the front-rear direction, across the outer conductor 13 and the housing 14. When the connecting member 15 is properly installed, the rear shielding portion 42 completely closes the rear surface opening of the surrounding portion 26. Additionally, as... Figure 1 and Figure 2 As shown, the back cover 42 and the bottom 41 are entirely embedded in the retaining space 31 within the surrounding portion 26. Furthermore, each rib 49 contacts the inner surface of the retaining space 31 and each fitting receiving portion 29. This prevents the connecting member 15 from disengaging downward from the outer conductor 13.

[0075] Furthermore, when the connecting member 15 is properly installed, each retaining protrusion 44 is integrally embedded into each retaining recess 39. Here, the rear surface of each retaining protrusion 44 and the inner surface of each retaining recess 39 are in contact with each other (see reference). Figure 1 The front surface of the high-height portion 45 and the rear surface of the lower portion 28 are arranged opposite each other in a manner that allows them to contact each other. As a result, the housing 14 and the outer conductor 13 are separated from each other in the front-rear direction by means of the connecting member 15. Consequently, the outer conductor 13 is reliably held in place of the housing 14.

[0076] As described above, the back shielding portion 42 and the bottom portion 41 are fitted into the retaining space 31 in such a way that they fill the retaining space 31 within the surrounding portion 26, thus supplementing the shielding performance of the outer conductor 13. In particular, as... Figure 2 As shown, the rear of the lead-out portion 16 of the first inner conductor 11A is covered by the back shielding portion 42, and the rear of the lead-out portion 16 of the second inner conductor 11B is covered by the high-height portion 45. As a result, the lead-out portion 16 of each inner conductor 11 is completely surrounded by the opening portion 48 by means of the dielectric 12. Therefore, the shielding performance can be further improved.

[0077] Furthermore, when the connector 10 is mounted on the circuit board 100, the protruding end 51 of the connector member 15 contacts and is supported by the surface of the circuit board 100. Here, the lead-out portion 16 of each inner conductor 11 is also surrounded by the periphery 52 of the protruding end 51 between the dielectric 12 and the circuit board 100. As a result, shielding performance can be further improved, and impedance matching can be achieved.

[0078] Thus, according to this embodiment, the die-cast outer conductor 13 and the housing 14 are connected to each other by means of the connecting member 15, thereby improving the retention reliability of the outer conductor 13 compared to the case where the outer conductor 13 is simply pressed into the housing 14.

[0079] In particular, the retaining recess 39 of the housing 14 and the retaining protrusion 44 of the connecting member 15 are formed in a vertical direction that intersects the mounting direction of the outer conductor 13. The retaining protrusion 44 and the retaining recess 39 are fitted together in a concave-convex manner, so that the connecting member 15 and the housing 14 can be reliably prevented from detaching from each other.

[0080] Furthermore, the connecting member 15 is conductive and has a back shielding portion 42 that covers the lead-out portion 16 of the first inner conductor 11A from the rear, thus providing both connection and shielding performance. As a result, it is not necessary to separately provide a dedicated shielding cover to cover the rear surface opening of the outer conductor 13, thereby simplifying the overall structure.

[0081] Furthermore, when the connector 10 is mounted on the circuit board 100, the bottom 41 is held in a manner that is sandwiched between the outer conductor 13 and the circuit board 100, so that the connector 15 can be prevented from detaching from the outer conductor 13 and the housing 14 without the need for a special locking structure.

[0082] [Other embodiments of this disclosure]

[0083] The embodiments disclosed herein should be considered illustrative in all respects, and not restrictive.

[0084] In the above embodiments, the connecting component is conductive and has shielding properties. However, in other embodiments, the connecting component may not have shielding properties, for example, it may only have a connecting function that connects the outer conductor and the housing. The connecting component that only has a connecting function may also be an insulating component, such as a component made of synthetic resin.

[0085] In the above embodiments, the connector is a substrate connector, but in other embodiments, the connector may also be a wire harness connector that connects the inner conductor to the end of the wire.

[0086] In the above embodiments, the outer conductor is made of die-cast zinc alloy; however, in other embodiments, the outer conductor may also be made of die-cast aluminum alloy, for example.

[0087] Explanation of reference numerals in the attached figures

[0088] 10: Connector

[0089] 11: Inner conductor

[0090] 11A: First inner conductor

[0091] 11B: Second inner conductor

[0092] 12: Dielectric

[0093] 12A: First dielectric

[0094] 12B: Second dielectric

[0095] 13: Outer conductor

[0096] 14: Shell

[0097] 15: Connecting structural components

[0098] 16: Introduction

[0099] 17: Extension

[0100] 18: Terminal extension section

[0101] 19: Terminal mounting section

[0102] 21: Mounting hole

[0103] 22: Extension slot

[0104] 23: Insertion Hole

[0105] 24: Cylinder

[0106] 25: Connecting section

[0107] 26: Enclosure

[0108] 27: Upper section

[0109] 28: Lower section

[0110] 29: Embossed Receiving Section

[0111] 31: Maintain space

[0112] 32: Legs

[0113] 33: Base

[0114] 34: Cover

[0115] 35: Embossed Space

[0116] 36: Through hole

[0117] 37: Guiding section

[0118] 38: Opposite surfaces

[0119] 39: Keep the recess

[0120] 41: Bottom

[0121] 42: Rear shielding section

[0122] 43: End wall part

[0123] 44: Keep the convex part

[0124] 45: High Altitude Section

[0125] 46: Low-altitude section

[0126] 47: Chimeric part

[0127] 48: Opening

[0128] 49: Ribs

[0129] 51: Protruding end

[0130] 52: Surrounding area

[0131] 53: Support end

[0132] 54: Press-in ribs

[0133] 55: Press-in protrusion

[0134] 56: Protruding part

[0135] 100: Circuit board

[0136] 101: Through hole

[0137] 102: Positioning hole

Claims

1. A connector comprising: An internal conductor with electrical conductivity; A die-cast outer conductor surrounds the inner conductor; An insulating housing, from which the outer conductor is mounted in the front-to-back direction; and Connecting structural components that link the outer conductor and the housing together. A connecting section is formed at the front of the outer conductor, and a surrounding section is formed at the rear of the outer conductor. Within the surrounding section, a retaining space is formed that is open at the rear and at the lower part in the vertical direction, the vertical direction intersecting the front-back direction. The housing has a base and a cover, the cover protruding forward from the base, and a mating connector is fitted into the cover. A through hole and a pair of guide portions are formed in the base, and a retaining recess is formed in each of the guide portions. The connecting cylindrical portion of the outer conductor is configured to protrude into the cover portion through the through hole. The connecting member has a bottom, a back cover portion connected to the rear end of the bottom, and a pair of retaining protrusions connected to the front end of the bottom. The connecting member is mounted from below in a manner that spans the outer conductor and the housing, with the back cover and the bottom of the connecting member integrally embedded in the retaining space of the outer conductor, and the retaining protrusion of the connecting member embedded in the retaining recess of the housing.

2. The connector according to claim 1, wherein, The retaining recess and the retaining protrusion are formed in such a way that they extend in the vertical direction.

3. The connector according to claim 1, wherein, The inner conductor has a lead-out portion located on the back side of the outer conductor, the connecting member is conductive, and the back shielding portion covers the lead-out portion from the back side.

4. The connector according to any one of claims 1 to 3, wherein, The inner conductor is connected to the circuit board. The bottom is configured to be sandwiched between the outer conductor and the circuit board.

5. The connector according to claim 4, wherein, The connecting component is conductive. The bottom of the connecting member has an opening that completely surrounds the outer periphery of the inner conductor.

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