JP2000299170A - L-shaped coaxial plug connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an L-shaped coaxial plug connector having an excellent electromagnetic shielding performance. SOLUTION: The L-shape coaxial plug connector, having a plug part 30 comprising a contact pin 10 and a cylinder 20 connected to a central conductor 202 and an external conductor 204 of a coaxial cable 200 respectively in a direction perpendicular to the coaxial cable 200, is provided with a pair of insulation members 40a, 40b constituting a spacer 40 composed of a column part 44 and a leg part 46 by putting together the central conductor 202 and the root part of the pin 10 in the state of being embedded in a holding groove 42, a pair of metal shield cover members 50a, 50b surrounding an exposed part of an external conductor 206 of the coaxial cable 200 and the leg part 46 of the spacer 40, and a metal connection holding member 80 whose crimping part 60 is crimped on the shield cover members 50a, 50b and the tip part of its cover 70 is engaged with the back end part of the cylinder 20. By the connection holding member 80 the cylinder 20 and the external conductor 204 are electrically connected, and the central conductor 202 is shielded by the shield cover members 50a, 50b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an L-shaped coaxial plug connector provided at the end of a coaxial cable.

[0002]

2. Description of the Related Art An L-shaped coaxial plug connector of this kind is connected to a metal contact pin connected to a center conductor of a coaxial cable, and to an outer conductor of the coaxial cable.
Insert the above contact pin into the inner insulating spacer (dielectric)
And a plug made of a metal cylinder held at its own axis center position at the end of the coaxial cable and arranged in a direction perpendicular to the axial direction of the coaxial cable. Then, the plug portion is held and fixed to the distal end portion of the coaxial cable by molding the root thereof together with the distal end portion of the coaxial cable with an injection molding resin.

As shown in FIG. 3, in this type of L-shaped coaxial plug connector, the connection between the cylinder 104 forming the plug portion 100 and the outer conductor 204 of the coaxial cable 200 is performed by the coaxial cable 200. A metal connecting piece 110 provided with a crimping portion 112 at the tip thereof, which is crimped to the outer conductor exposed portion 206 where the conductor 204 is exposed,
The connecting piece 110 is attached to the rear end of the cylinder 104 (that is, the end opposite to the front end connected to the mating connector) so as to extend at right angles to the cylinder 104.
Is crimped to the outer conductor exposed portion 206 of the coaxial cable 200. The connection between the contact pin 102 constituting the plug part 100 and the center conductor 202 of the coaxial cable 200 is performed by connecting the rear end of the contact pin 102 protruding from the rear end of the cylinder 104 to
The coaxial cable 200 is connected to the central conductor 202 extending from the end by soldering or electric welding.

[0004] In FIG. 3, a portion denoted by reference numeral 300 surrounded by a dashed line is a protective cover made of resin by the above-described injection molding, and the inside of the L-type coaxial plug connector is protected by moisture by the protective cover 300. The plug portion 100 is protected from dust and the like, and the plug portion 100 is firmly held and fixed to the distal end portion of the coaxial cable 200.

A connecting piece similar to the connecting piece 110 shown in FIG. 3 is attached so as to extend straight from the rear end of the cylinder 104 in the axial direction, and the crimped portion of the connecting piece is connected to the coaxial cable 200. After crimping to the exposed outer conductor portion 206, the connection piece may be bent at a right angle.

[0006]

However, in the above-mentioned conventional L-shaped coaxial plug connector, the presence of the protective cover 300 makes it difficult to see from the external appearance.
00 is not shielded by the outer conductor 204. For this reason, it is easy for external noise to be mixed into the center conductor 202 and the contact pins 102, and conversely, radiation noise caused by high-frequency signals transmitted to the center conductor 202 and the contact pins 102 is transmitted to external electronic devices and the like. Easy to give. In particular, in recent years, digital satellite broadcasting in the several GHz (gigahertz) band has become widespread. In order to transmit such a high frequency signal of digital satellite broadcasting from a connector on the indoor wiring side to a connector on the TV tuner side, If a conventional coaxial cable for relay with an L-shaped coaxial plug connector is used, there is a great possibility that the reception level will be deteriorated.

On the other hand, Japanese Utility Model Publication No. 2-12691 discloses that
The shape of the connection piece for connecting the cylinder constituting the plug portion and the outer conductor of the coaxial cable is as follows: a tip between the inner dielectric (inner insulator) and the outer conductor of the coaxial cable is provided at the end opposite to the cylinder. A cylindrical outer conductor crimp receiving portion inserted into the outer conductor is provided, and when a predetermined portion between the outer conductor crimp receiving portion and the cylinder is bent at a right angle, a central conductor extending from the end of the coaxial cable is surrounded. A space to do
It is described that a lid for closing the space is provided in front of the outer conductor crimp receiving portion.
In the above publication, such a connection piece and a cylinder are integrated, and this is called an outer cylinder shell.

In the L-shaped coaxial plug connector described in the above publication, the center conductor is not completely unshielded as in the plug connector shown in FIG. 3, but the connection piece is bent at a right angle at a predetermined position. As a result, a shield wall covering the center conductor is formed, so that the shield wall cannot be set to the same potential over the entire circumference, and a gap is formed by bending, so that a sufficient electromagnetic shielding property is obtained. I can't get it.

Therefore, an object of the present invention is to provide an L-shaped coaxial plug connector having excellent electromagnetic shielding properties.

[0010]

The L-shaped coaxial plug connector according to the present invention, which has been made to achieve the above object, has a tip portion of a coaxial cable in which a center conductor and an outer conductor are exposed in this order. A metal contact pin connected to the distal end of the central conductor bent substantially at right angles to the axial direction of the coaxial cable, accommodating the contact pin at an axial center position, and And a plug made of a metal cylinder connected to the outer conductor of the coaxial cable in a direction orthogonal to the axial direction of the coaxial cable.

Here, the L-shaped coaxial plug connector of the present invention particularly includes a pair of insulating members and a pair of metal shield cover members. On each end face of the pair of insulating members, a holding groove capable of burying the center conductor and a root portion of the contact pin connected to the center conductor is formed, respectively. A cylindrical portion that is inserted into the cylinder and holds the contact pin at the axial center of the cylinder by aligning the end faces of the center conductor and the contact pin with the root portions of the contact pin embedded in the holding groove. And an L-shaped leg extending from the rear end surface of the columnar portion and surrounding the center conductor. Further, the pair of shield cover members are aligned with each other, so that the inner surfaces thereof are in close contact with the outer conductor exposed portions where the outer conductor is exposed by the coaxial cable, and the outer conductor exposed portions are And surrounding the legs of the spacer.

Further, the L-shaped coaxial plug connector of the present invention includes a metal connecting and holding member including a caulked portion and a cover portion. The caulking part of this connection holding member is
The cross-sectional shape is formed in a U-shape capable of surrounding the pair of shield cover members, and the outer conductor exposed portion of the coaxial cable and the leg of the spacer are surrounded by the pair of shield cover members. And the pair of shield cover members. Also, the cover portion of the connection holding member extends from the end of the crimped portion on the distal end side of the coaxial cable in a direction orthogonal to the axial direction of the crimped portion, and the distal end portion is The spacer is fitted to the rear end of the cylinder through which the cylindrical portion of the spacer is inserted.

In the L-shaped coaxial plug connector according to the present invention, the caulking portion of the connection holding member is caulked to the pair of shield covers, and the front end of the cover of the connection holding member and the rear end of the cylinder. The connection between the outer conductor of the coaxial cable and the cylinder and the electromagnetic shielding by the shield cover member of the center conductor are performed. Further, in the L-shaped coaxial plug connector of the present invention, a protective cover made of resin is fixed so as to cover the entire connection holding member.

The assembly of such an L-shaped coaxial plug connector to a coaxial cable is performed, for example, as follows. First, the coaxial cable to be assembled is subjected to a peeling process in advance so that the center conductor and the outer conductor are exposed in that order (see FIG. 3).

Next, a contact pin is connected to the tip of the center conductor extending from the tip of the coaxial cable.
The center conductor is bent substantially at right angles to the axial direction of the coaxial cable. As a result, the contact pins face in a direction perpendicular to the axial direction of the coaxial cable. The contact pins may be connected after bending the center conductor.

Then, the column portion and the L-shape are formed by fitting the end portions of the pair of insulating members so that the central portions of the center conductor and the contact pins are inserted into the respective holding grooves of the pair of insulating members. Then, the end faces of the pair of shield cover members are aligned so as to surround the leg of the spacer and the exposed portion of the outer conductor of the coaxial cable.

Next, the caulked portion of the connection holding member is caulked to the pair of shield cover members. As a result, the pair of shield cover members are held in a state where their inner surfaces are in close contact with the exposed outer conductor of the coaxial cable and their end surfaces are in close contact with each other. In this state, the pair of insulating members are held in the shape of a spacer composed of a cylindrical portion and a leg portion, and further, the contact pins protrude from the cylindrical portion of the spacer composed of the pair of insulating members. Become.

Next, the cylindrical portion of the spacer is inserted into the rear end of the cylinder together with the contact pins protruding therefrom (ie, the end opposite to the front end connected to the mating connector) to form a plug. At the same time, the rear end of the cylinder accommodating the contact pins and the columnar portion of the spacer is fitted to the front end of the cover of the connection holding member.

Finally, the part from the root of the cylinder to the outer sheath of the coaxial cable is molded with injection molding resin. Thus, the protective cover made of resin is fixed so as to cover the entire connection holding member, and the present L-shaped coaxial plug connector is completed. In the above-described L-shaped coaxial plug connector of the present invention, the center conductor exposed from the distal end of the coaxial cable and connected to the contact pin is completely formed by the pair of shield cover members having the same potential as the outer conductor of the coaxial cable. , An excellent electromagnetic shielding effect can be obtained.

By the way, in the L-shaped coaxial plug connector of the present invention, in order to easily and surely engage the front end portion of the cover portion of the connection holding member with the rear end portion of the cylinder, the configuration according to claim 2 is provided. Adopt it. That is, in the L-shaped coaxial plug connector according to claim 2, the cover portion of the connection holding member has an arc-shaped cross section which can be in close contact with the outer peripheral surface of the cylinder, and a tip portion of the cover portion. A projection is formed on the inner wall surface. The rear end of the cylinder is wider than the projection on the cover side, and extends from the end of the first cut in the first cut and the end of the first cut extending in the axial direction from the end of the cylinder. A notch for engagement consisting of a second cut extending in the circumferential direction is formed. Then, the front end of the cover portion and the rear end of the cylinder are engaged with each other when the projection enters the second cut through the first cut of the engagement cut. That is, in this L-shaped coaxial plug connector, the front end of the cover and the rear end of the cylinder are fitted at a position where the projection and the first cut meet, and thereafter the cover and the cylinder are mutually connected. Twist,
Just make the protrusion go into the second cut,
Both can be firmly engaged.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIGS. 1A and 1B are views showing the appearance and the internal structure of the L-shaped coaxial plug connector of the present embodiment, wherein FIG. 1A shows the appearance, FIG. 1B shows the internal structure, and FIG. B) shows a side view from the right. FIG. 2 is a perspective view showing an assembled state of the L-shaped coaxial plug connector of the present embodiment.

As shown in FIGS. 1 and 2, an L-shaped coaxial plug connector (hereinafter simply referred to as a “plug connector”) of the present embodiment has a coaxial cable in which a center conductor 202 and an outer conductor 204 are exposed in this order. A metal (for example, beryllium copper) contact pin 10 that is provided at the tip of the coaxial cable 200 and that is connected to the tip of a center conductor 202 bent substantially perpendicularly to the axial direction of the coaxial cable 200; The plug 10 is accommodated in the axial center position, and a plug portion 30 including the cylinder 20 connected to the outer conductor 204 of the coaxial cable 200 is provided in a direction orthogonal to the axial direction of the coaxial cable 200.
Incidentally, the cylinder 20 is also formed of the same metal as the contact pins 10.

The plug connector according to the present embodiment includes a center conductor 202 and contact pins 10 connected thereto.
A holding groove 42 capable of burying the root portion of each is formed on its own end face, and the end faces of the center conductor 202 and the contact pin 10 are buried in the holding groove 42 so that the end faces are aligned with each other. It comprises a cylindrical portion 44 inserted through the cylinder 20 to hold the contact pin 10 at the axial center of the cylinder 20, and an L-shaped leg 46 extending from the rear end surface of the cylindrical portion 44 and surrounding the central conductor 202. A pair of insulating members 40a and 40b forming the spacer 40;
The coaxial cable 2
00, a pair of shield cover members 50a, 50a surrounding the outer conductor exposed portion 206 and the leg portion 46 of the spacer 40 in a state where their inner surfaces are in close contact with the outer conductor exposed portion 206 where the outer conductor 204 is exposed. 50b.

Further, in the plug connector of the present embodiment, the outer conductor 204 of the coaxial cable 200 is electrically connected to the cylinder 20, and the pair of shield cover members 50a and 50b are held in close contact with each other. For this purpose, a connection holding member 80 including a caulking portion 60 and a cover portion 70 is provided. The connection holding member 80 and the pair of shield cover members 50a and 50b are both formed of the same metal (for example, phosphor bronze).

In this plug connector,
A portion from the root portion of the cylinder 20 to the outer sheath 208 of the coaxial cable 200 is molded with injection-molded resin, whereby the resin-made protective cover 90 is fixed so as to cover the entire connection holding member 80. Have been.

Here, as shown in FIGS. 1A and 2, the cylinder 20 has a predetermined length in the axial direction from its tip (the left end in the figure) in order to have elasticity in the radial direction. Is formed. 1 (B) and FIG.
As shown in FIG. 7, in each of the pair of insulating members 40a and 40b, a flange for determining an accommodation position of the cylindrical portion 44 in the cylinder 20 is provided around an end of a portion to be the cylindrical portion 44 of the spacer 40. 48 are provided.

On the other hand, as shown in FIG. 2, when the end surfaces of the pair of shield cover members 50a and 50b are joined together, the outer conductor exposed portion 206 of the coaxial cable 200 and the above-mentioned pair of insulating members are provided. The groove 52 is provided so as to form a space surrounding the leg portion 46 of the spacer 40 composed of the sex members 40a and 40b in a close contact state. Also,
Pins 54 and holes 56 are provided on the end faces of the shield cover members 50a and 50b to determine the mutual alignment position. That is, the pin 54 provided on the shield cover member 50a side is inserted into the hole 56 (not shown) provided on the shield cover member 50b side,
By inserting the pin 54 (not shown) provided on the shield cover member 50b side into the hole 56 provided on the shield cover member 50a side, the two shield cover members 50a and 50b do not shift at predetermined positions. Can be matched.

On the other hand, as shown in FIGS. 1B, 1C and 2, the crimping portion 60 of the connecting and holding member 80 has a cross-sectional shape of the pair of shield cover members 50a and 50a.
It is formed in a U-shape capable of surrounding b. In the caulking portion 60, the outer conductor exposed portion 206 of the coaxial cable 200 and the leg portion 46 of the spacer 40 including the pair of insulating members 40a and 40b are surrounded by the pair of shield cover members 50a and 50b. In this state, it is crimped to the pair of shield cover members 50a and 50b.

As shown in FIGS. 1 (B), 1 (C) and 2, the cover 70 of the connecting and holding member 80 extends from the end of the caulking portion 60 on the distal end side of the coaxial cable 200.
The caulking portion 60 extends in a direction orthogonal to the axial direction, and has a cross-sectional shape formed in an arc shape that can be in close contact with the outer peripheral surface of the cylinder 20. Describing in detail, the cover part 70 extends in the axial direction of the bottomed cylinder whose rear end is closed,
It has a shape in which a cut 70a wider than the diameter of a cylinder formed by combining a pair of shield cover members 50a and 50b is provided, and the unblocked (opened) tip is a cylinder. 20 is fitted to the rear end (the right end in the figure). And in other words, the caulked portion 60 extends from a position where the closed rear end of the cover portion 70 and the cut 70a coincide.

Further, as shown in FIG. 2, a projection 70b is formed on the inner wall surface (inner wall surface) at the distal end of the cover 70 by beating from the outside.
In FIG. 2, for convenience of illustration, a lead line denoted by reference numeral 70 b indicating a protrusion extends from the outside of the cover 70.

At the rear end of the cylinder 20, there is formed an L-shaped engagement notch 20b wider than the projection 70b on the cover 70 side. That is, the notch 20b for engagement is formed by a first cut K1 extending in the axial direction from the end of the cylinder 20 and a second cut K2 extending in the circumferential direction of the cylinder 20 from the end of the first cut K1. The front end of the cover 70 and the rear end of the cylinder 20 are formed such that the protrusion 70b on the cover 70 side passes through the first cut K1 of the engagement cut 20b and the second cut K
2 are engaged with each other.

The plug connector of this embodiment is assembled to the distal end of the coaxial cable 200 in the following procedure, for example. The coaxial cable 200 to be assembled has a center conductor 202 and an outer conductor 2 as shown in FIG.
A peeling process is performed in advance so that No. 04 is exposed in that order. In FIG. 2, reference numeral 209 denotes an internal insulator of the coaxial cable.

First, the rear end of the contact pin 10 is connected to the front end of the center conductor 202 extending from the front end of the coaxial cable 200 by caulking, electric welding, or the like. Bend almost perpendicular to the axial direction. Thereby, the contact pins 10
2 is directed in a direction orthogonal to the axial direction of the coaxial cable 200 as shown in FIG. Contact pin 1
0 may be connected after the center conductor 202 is bent.

As shown by the dashed-dotted arrow in FIG. 2, the pair of insulating members 40a and 40b are so arranged that the central portions of the central conductor 202 and the contact pins 10 are inserted into the holding grooves 42 of the insulating members 40a and 40b. By aligning the end surfaces of the elastic members 40a and 40b with each other, a spacer 40 composed of a cylindrical portion 44 and an L-shaped leg 46 is formed, and the leg 46 of the spacer 40 and the external conductor of the coaxial cable 200 are exposed. The end faces of the pair of shield cover members 50a and 50 are aligned so as to surround the portion 206.

Next, the connection holding member 80 is attached to the end of the coaxial cable 200 such that the end of the cylinder formed by combining the pair of shield cover members 50a and 50b enters the cover 70 through the cut 70a. At the same time (see the dotted arrow in FIG. 2), the crimping portion 60 of the connection holding member 80 is brought into contact with the pair of shield cover members 50a and 50b.

Then, the caulked portion 60 of the connection holding member 80
To the pair of shield cover members 50a and 50b. As a result, the pair of shield cover members 50a, 50
0b, the inner surface thereof is in close contact with the outer conductor exposed portion 206 of the coaxial cable 200, and the end surfaces thereof are held in close contact with each other, and the pair of shield cover members 50a, 50b causes The insulating members 40a and 40b are held in the shape of the spacer 40 including the column portion 44 and the leg portion 46, and the contact pins 10 protrude from the column portion 44 of the spacer 40. Become.

Next, as shown by the two-dot chain line arrow in FIG.
The cylindrical portion 44 of the spacer 40 is pressed into the rear end of the cylinder 20 together with the contact pins 10 protruding therefrom,
The plug portion 30 is completed by bringing the flange 48 of the spacer 40 into contact with the rear end of the cylinder 20, and further, the rear end of the cylinder 20 and the front end of the cover 70 of the connection holding member 80. Are fitted and engaged. In order to fit and engage the two, first, the rear end of the cylinder 20 and the front end of the cover 70 are aligned with the projection 70b on the cover 70 and the first cut K1 on the cylinder 20. Mated in position,
Next, the cylinder 20 and the cover 70 are twisted with each other so that the projection 70b enters the second cut K2 on the cylinder 20 side.

Finally, a portion from the root portion of the cylinder 20 to the outer jacket 208 of the coaxial cable 200 is molded with injection molding resin. Thereby, the protective cover 90 made of resin is formed so as to cover the entire connection holding shield member 80.
Are fixed, and the plug connector of the present embodiment is completed.

In the plug connector of the present embodiment as described above, the pair of shield cover members 50a and 50b are brought into close contact with the outer conductor exposed portion 206 of the coaxial cable 200 to have the same potential as the outer conductor 204, and Since the cover members 50a and 50b are completely exposed from the distal end of the coaxial cable 200 and completely surround the central conductor 202 connected to the contact pin 10, an excellent electromagnetic shielding effect can be obtained.

In the plug connector according to the present embodiment,
Since the L-shaped engagement notch 20b is provided on the cylinder 20 side and the projection 70b is provided on the cover 70 side of the connection holding member 80, the front end of the cover 70 and the rear end of the cylinder 20 are connected. The engagement can be easily and reliably performed. In addition, there is no need to bend a large metal fitting like the plug connector described in the above-mentioned publication, and the assembling property is excellent.

As described above, one embodiment of the present invention has been described. However, it is needless to say that the present invention is not limited to the above-described embodiment, and can take various forms. For example, in the above embodiment, the outer conductor exposed portion 206 of the coaxial cable 200 is a portion where the outer coating 208 of the coaxial cable 200 is peeled off as shown in FIG. Outer coating 208
And its outer conductor 204 is
8 may be covered.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an appearance and an internal structure of an L-shaped coaxial plug connector according to an embodiment.

FIG. 2 is a perspective view illustrating an assembled state of the L-shaped coaxial plug connector of the embodiment.

FIG. 3 is an explanatory view for explaining a conventional L-shaped coaxial plug connector and its problems.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Contact pin 20 ... Cylindrical 20b ... Engagement cut 30 ... Plug part 40a, 40b ... A pair of insulating members 40 ... Spacer 42 ... Holding groove 44 ... Column part 46 ... L-shaped leg 48 ... Flange 50a, 50b … A pair of shield cover members 52…
Groove 60: Caulking part 70: Cover part 70b: Projection 80: Connection holding member 90: Protective cover 200: Coaxial cable 202
... Center conductor 204 ... Outer conductor 206 ... Exposed portion of outer conductor 2
08 ... outer coating

Claims (2)

[Claims] 1. A metal connected to a distal end of a central conductor which is provided at a distal end of a coaxial cable where a central conductor and an outer conductor are exposed in that order, and which is bent substantially at right angles to an axial direction of the coaxial cable. A plug portion made of a metal contact pin and a metal cylinder connected to the outer conductor of the coaxial cable while accommodating the contact pin at the center of the shaft is orthogonal to the axial direction of the coaxial cable. An L-shaped coaxial plug connector provided in a direction, wherein a holding groove capable of burying the center conductor and a root portion of the contact pin connected to the center conductor is formed on an end face of the L-shaped coaxial plug connector. The end faces of the conductor and the contact pin are aligned with each other in a state of being buried, so that the contact pin is inserted into the cylinder and the contact pin is inserted into the cylinder. A pair of insulating members forming a spacer comprising a cylindrical portion to be held at the center position and an L-shaped leg extending from the rear end surface of the cylindrical portion and surrounding the central conductor; A pair of shield covers made of metal surround the exposed portion of the outer conductor and the legs of the spacer in a state where their inner surfaces are in close contact with the exposed portion of the outer conductor in the coaxial cable. And a cross-sectional shape is formed in a U-shape capable of surrounding the pair of shield cover members, and the outer conductor exposed portion of the coaxial cable and the leg portion of the spacer are surrounded by the pair of shield cover members. A crimping portion that is crimped to the pair of shield cover members in a state in which the crimping portion is fixed, and an axial direction of the crimping portion from a distal end of the crimping portion in the coaxial cable. A metal cover comprising: a cover extending in a direction perpendicular to the cylinder and having a front end fitted to a rear end of the cylinder through which the cylindrical portion of the spacer is inserted; A crimping portion of the connection holding member is crimped to the pair of shield cover members, and a front end portion of the cover portion of the connection holding member and a rear end portion of the cylinder are fitted to each other. The connection between the outer conductor of the coaxial cable and the cylinder and the electromagnetic shielding by the shield cover member of the center conductor are performed, and a protective cover made of resin is fixed so as to cover the entire connection holding member. And an L-shaped coaxial plug connector. 2. The L-shaped coaxial plug connector according to claim 1, wherein the cover of the connection holding member has an arc-shaped cross section which can be in close contact with the outer peripheral surface of the cylinder, and the cover has A protrusion is formed on the inner wall surface at the tip of the portion, and a first cut at the rear end of the cylinder is wider than the protrusion and extends in the axial direction from the end of the cylinder. And a second extending from the end of the first cut in the circumferential direction of the cylinder.
A notch for engagement consisting of a notch is formed, and a front end of the cover portion and a rear end of the cylinder are formed so that the protrusion passes through a first cut of the engagement cut and forms a second cut. An L-shaped coaxial plug connector characterized by being engaged with each other by entering.