JP4503793B2 - Coaxial plug - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a coaxial plug attached to the tip of a coaxial cable.
[0002]
[Prior art]
A receiving device such as a television or a satellite broadcasting tuner is equipped with a coaxial connector, and a received signal is input by attaching a coaxial plug attached to the end of the coaxial cable to the coaxial connector.
FIG. 34 shows the configuration of a conventional coaxial plug attached to the end of such a coaxial cable.
[0003]
A coaxial plug 300 shown in FIG. 34 includes a plug body 311 and a rotary attachment body 312 that is rotatably attached to the plug body 311. The rotary mounting body 312 is formed of a hexagonal nut, and a female screw that is screwed to the coaxial connector is cut on the inner peripheral surface. The plug body 311 is formed so as to project from the ring-shaped portion 311c, a projecting portion 311f that projects from one surface of the ring-shaped portion 311c, and rotatably supports the rotary mounting body 312. The cable insertion portion 311a is provided. The cable insertion portion 311a is a portion inserted between the inner insulator of the coaxial cable and the braided wire, and a stopper portion 311b having a sawtooth cross section for locking the tip thereof so as not to come out of the coaxial cable. Is formed.
[0004]
In order to attach such a coaxial plug 300 to a coaxial cable, first, the outer sheath at the end of the coaxial cable is removed to expose the internal insulator by a predetermined length. Further, the internal insulator is removed to expose the core wire by a predetermined length. The core wire and the internal insulator of the coaxial cable thus processed are inserted from the rear end of the cable insertion portion 311a of the plug main body 311 so that the core wire is disposed at the approximate center of the rotary attachment body 312. At this time, the cable insertion portion 311a is inserted between the inner insulator of the coaxial cable and the braided wire, and the front end of the outer sheath of the coaxial cable is in the cable contact groove 311d formed on the other surface of the ring-shaped portion 311c. Abut. In this state, the caulking ring 302 is caulked by positioning the caulking ring 302 on the coaxial cable positioned between the ring-shaped portion 311c and the retaining portion 311b. As a result, the coaxial cable is crimped to the cable insertion portion 311a by the caulking ring 302, and the retaining portion 311b is fixed so as not to come out of the coaxial cable.
[0005]
[Problems to be solved by the invention]
The conventional coaxial plug 300 attached to the tip of the coaxial cable is attached to the coaxial connector by screwing the rotary attachment body 312 to the coaxial connector.
By the way, in the conventional coaxial plug 300, the braided wire which comprises the ground of a coaxial cable, and the coaxial connector are connected, when the front-end | tip of the protrusion part 311f contact | abuts the front-end | tip of a coaxial connector. The coaxial connector shell to be abutted constitutes a ground. However, the screw connection may be loosened due to various causes, and even in the coaxial plug 300, the rotary mounting body 312 may be loosened relative to the shell of the coaxial connector. In this case, the contact between the tip of the protruding portion 311f and the shell of the coaxial connector is released, and the connection by contact is not performed between the two. Therefore, it is connected to the braided wire via the rotary attachment body 312 and the plug main body 311 that are screwed to the coaxial connector, and is grounded. However, the rotary attachment body 312 is rotatably attached to the plug body 311 and is coupled with a gap between them in order to be rotatable. Then, there is a problem that the connection between the rotary mounting body 312 and the plug body 311 becomes incomplete due to this gap. When the connection between the rotary mounting body 312 and the plug body 311 is incomplete, the connection between the braided wire of the coaxial cable and the shell of the coaxial connector becomes incomplete, and the insertion loss characteristic and the reflection loss characteristic of the coaxial plug 300 deteriorate. There arises a problem that the transmission and reception of signals is hindered.
[0006]
This will be described with reference to the graphs shown in FIGS.
FIG. 35 shows insertion loss characteristics when the coaxial plug 300 is securely screwed to the coaxial connector. Referring to this figure, it can be seen that the insertion loss is about 0.5 dB or less over a wide band up to 2.5 GHz. FIG. 36 shows the reflection loss characteristics when the coaxial plug 300 is securely screwed to the coaxial connector. Referring to this figure, it can be seen that the reflection loss is about 23 dB or more over a wide band up to 2.5 GHz.
Next, FIG. 37 shows insertion loss characteristics when the coaxial plug 300 is attached to the coaxial connector with one turn loosened. Referring to this figure, it can be seen that the insertion loss is greatly degraded in the low frequency band up to 0.5 GHz. Also, FIG. 38 shows the reflection loss characteristics when the coaxial plug 300 is attached to the coaxial connector with one turn loosened. Referring to this figure, it can be seen that the reflection loss is greatly degraded over the frequency band up to about 1.5 GHz.
[0007]
Therefore, an object of the present invention is to provide a coaxial plug in which insertion loss characteristics and reflection loss characteristics are not deteriorated even when the coaxial plug is loosened.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a first coaxial plug according to the present invention is a coaxial plug that is attached to the tip of a coaxial cable, and includes a ring-shaped portion and a cylinder that projects from one surface of the ring-shaped portion. A plug body including a curled portion having a shape and a cable insertion portion formed so as to protrude from the other surface of the ring-shaped portion and insertable between an inner insulator of the coaxial cable and a braided wire; A disc-shaped spring housed in a spring housing groove formed on one surface of the ring-shaped portion, and a rotation mechanism that is formed in a substantially cylindrical shape and projects inwardly in a substantially central portion of the inner peripheral surface thereof. Rotation mounting comprising a joint portion and a mounting screw portion, a main body storage portion for storing the ring-shaped portion formed at one end portion of the inner peripheral surface, and a spring storage portion formed at the other end portion of the inner peripheral surface Body and within the spring storage And a ring-shaped spring is, the curling portion is curling is, the rotatably engaged with a rotational coupling portion, the rotating mounting member is rotatable relative to the plug body The disc-shaped spring is interposed between one surface of the ring-shaped portion and the rotation engaging portion of the rotary attachment body, and electrical connection between the two is performed by the disc-shaped spring, and the rotation When the mounting screw portion of the mounting body is screwed to a male screw formed on the outer peripheral surface of the coaxial connector, the ring-shaped spring performs electrical connection between the rotary mounting body and the coaxial connector. It is.
In the first coaxial plug of the present invention, the ring-shaped spring may be formed by bending an elastic metal plate having a band shape into a ring shape.
[0009]
Further, the second coaxial plug of the present invention capable of achieving the above object is a coaxial plug attached to the tip of the coaxial cable, and is formed so as to protrude from the ring-shaped portion and one surface of the ring-shaped portion. A plug body comprising a cylindrical curled portion and a cable insertion portion formed so as to protrude from the other surface of the ring-shaped portion and insertable between an inner insulator of the coaxial cable and a braided wire; A rotation engaging portion and a mounting screw portion projecting inwardly formed at a substantially central portion of the inner peripheral surface, and a main body storage portion formed at one end portion of the inner peripheral surface. A rotary mounting body provided with a spring storage portion formed at the other end of the inner peripheral surface, a first ring spring stored in the main body storage portion in a state of being inserted into the ring-shaped portion, Second stored in the spring storage And a ring-shaped spring, The first ring-shaped spring is interposed between the outer peripheral surface of the ring-shaped portion and the inner peripheral surface of the rotary mounting body, and electrical connection between the two is performed by the first ring-shaped spring, When the mounting screw portion of the rotary mounting body is screwed to the male screw formed on the outer peripheral surface of the coaxial connector, the electrical connection between the rotary mounting body and the coaxial connector is performed by the second ring spring. It is.
Further, in the first coaxial plug or the second coaxial plug according to the present invention, a locking projection for locking a spring stored in the spring storage portion may be formed at a tip of the spring storage portion. .
[0010]
Furthermore, a third coaxial plug of the present invention that can achieve the above object is a coaxial plug that is attached to the tip of a coaxial cable, and is formed so as to protrude from one surface of the ring-shaped portion. A plug body comprising: a cylindrical curled portion formed; and a cable insertion portion formed so as to protrude from the other surface of the ring-shaped portion and insertable between an inner insulator of the coaxial cable and a braided wire And a rotation engaging portion and a spring storage portion protruding inwardly formed at a substantially central portion of the inner peripheral surface thereof, and a main body storage portion formed at one end portion of the inner peripheral surface. A rotating mounting body including a mounting screw portion formed on the other end portion of the inner peripheral surface, a first ring-shaped spring stored in the main body storage portion in a state of being fitted into the ring-shaped portion, Housed in the spring housing And a second ring-shaped spring, The first ring-shaped spring is interposed between the outer peripheral surface of the ring-shaped portion and the inner peripheral surface of the rotary mounting body, and electrical connection between the two is performed by the first ring-shaped spring, When the mounting screw portion of the rotary mounting body is screwed to the male screw formed on the outer peripheral surface of the coaxial connector, the electrical connection between the rotary mounting body and the coaxial connector is performed by the second ring spring. It is.
In the second coaxial plug or the third coaxial plug according to the present invention, the ring-shaped spring may be formed by bending a metal plate having elasticity in a band shape into a ring shape.
[0011]
According to the present invention, the plug body and the rotary mounting body are connected by the disc spring or the ring spring, and the rotary mounting body and the coaxial connector as the mounted body are connected by the ring spring. Since it did in this way, even if a rotary attachment body loosens, it can prevent that the connection of earth | ground becomes incomplete. For this reason, even if the coaxial plug is loosened with respect to the coaxial connector, the electrical characteristics of the coaxial plug do not deteriorate.
In this way, the ground connection can be prevented from being incomplete with a simple configuration by using a disk-shaped spring and a ring-shaped spring, or by using two ring-shaped springs. Therefore, an increase in cost can be suppressed as much as possible.
Further, since the entire length of the rotary attachment body becomes long, it becomes easy to operate the rotary attachment body with a finger, and the coaxial plug can be easily attached to the coaxial connector embedded in a wall or the like.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
A first configuration example of the embodiment of the coaxial plug according to the present invention is shown in FIG. 1, and an exploded view thereof is shown in FIG. Further, FIG. 3 shows a cross-sectional view when the coaxial plug according to the first embodiment of the present invention is securely attached to the coaxial connector, and FIG. 4 shows a cross-sectional view when it is loosely attached. Furthermore, the structure of each component of the coaxial plug according to the first embodiment of the present invention is shown in FIGS. Hereinafter, a first configuration example of the embodiment of the coaxial plug according to the present invention will be described based on these drawings.
[0013]
As shown in FIG. 1, the first coaxial plug according to the embodiment of the present invention includes a plug body 11 and a rotary attachment body 12 that is rotatably attached to the plug body 11. The plug body 11 made of metal is formed so as to protrude from one surface of a ring-shaped portion 11c and a ring-shaped portion 11c as shown in FIGS. And a cable insertion portion 11a formed so as to protrude from the other surface of the ring-shaped portion 11c. The plug body 11 is formed with a through hole substantially along the central axis throughout. Furthermore, the cable insertion part 11a is formed so that the diameter becomes thinner as going forward, and is a part inserted between the inner insulator of the coaxial cable and the braided wire. At the tip of the cable insertion portion 11a, a retaining portion 11b having a sawtooth cross section for locking so as not to come out of the coaxial cable is formed in a ring shape. A spring accommodating groove 11e for accommodating a disc-shaped spring 13 is formed on one surface of the ring-shaped portion 11c, and a coaxial cable mounted on the other surface of the ring-shaped portion 11c. A cable abutting groove 11d with which the tip of each abuts is formed.
[0014]
The rotational attachment body 12 made of metal is formed in a cylindrical shape, and a non-slip knurling process is applied to the outer periphery thereof. As shown in FIGS. 2 and 6, a mounting screw portion 12 b that is screwed to the coaxial connector is cut at a substantially central portion of the inner peripheral surface of the rotary mounting body 12. A main body storage portion 12 a that stores the ring-shaped portion 11 c of the plug main body 11 is formed at one end portion of the inner peripheral surface of the rotary attachment body 12. A rotation engaging portion 12d protruding inward is formed between the main body storage portion 12a and the mounting screw portion 12b. The rotation engaging portion 12d is a portion that is rotatably engaged with the curling portion 11f when the curling portion 11f of the plug body 11 is curled. Further, the other end portion of the inner peripheral surface of the rotary mounting body 12 is formed with a spring accommodating portion 12c for accommodating a ring-shaped spring 14 formed in a ring shape. A locking projection 12e that locks the stored ring-shaped spring so as not to come out is formed in a ring shape at the tip of the spring storage portion 12c.
[0015]
Then, as shown in FIG. 2, the disc-like spring 13 is housed in the spring housing groove 11e of the plug body 11 in the state shown in FIG. 5, and is inserted into the rotary attachment body 12 from the curled portion 11f side. The ring-shaped portion 11c is inserted into the main body storage portion 12a. In this state, when the curling portion 11f is curled so as to curl outward, the curled portion 11f after processing is rotatably engaged with the rotation engaging portion 12d as shown in FIGS. It becomes like this. Next, the coaxial plug 1 can be assembled by fitting the ring-shaped spring 14 into the spring accommodating portion 12 c of the rotary attachment body 12.
[0016]
In order to attach such a coaxial plug 1 to the coaxial cable 3, as shown in FIG. 1, the outer jacket 31 at the tip of the coaxial cable 3 is removed to expose the internal insulator 32 by a predetermined length. Further, the inner insulator 32 is removed to expose the core wire 33 for a predetermined length. The core wire 33 and the internal insulator 32 of the coaxial cable 3 processed in this way are inserted from the rear end of the cable insertion portion 11 a of the plug body 11, and the core wire 33 is disposed at the approximate center of the rotary attachment body 12. The core wire 33 constitutes the central conductor of the coaxial plug 1. At this time, as shown in FIGS. 3 and 4, the cable insertion portion 11a is inserted between the inner insulator 32 and the braided wire 34 of the coaxial cable 3, and the braided wire 34 and the cable insertion portion 11a are electrically connected. Connected. Further, as shown in FIGS. 3 and 4, the tip of the outer jacket 31 of the coaxial cable 3 comes into contact with a cable contact groove 11d formed on the other surface of the ring-shaped portion 11c. In this state, the caulking ring 2 is positioned on the coaxial cable 3 located between the ring-shaped portion 11c and the retaining portion 11b, and the caulking ring 2 is caulked. As a result, the coaxial cable is caulked to the cable insertion portion 11a by the caulking ring 2 as shown in FIGS. 3 and 4, and the retaining portion 11b is fixed so as not to come out of the coaxial cable.
[0017]
In the coaxial plug 1 according to the first embodiment of the present invention, the electrical connection between the ring-shaped portion 11c and the rotary mounting body 12 is performed by a disk-shaped spring 13 interposed therebetween. Since the disk-like spring 13 is housed in the spring housing groove 11e, it is not crushed until it becomes flat, and the spring action is not lost. A detailed configuration of the disc-shaped spring 13 is shown in FIGS. 7A is a plan view of the disc-shaped spring 13, and FIG. 7B is a side view thereof. As shown in these drawings, the disk-like spring 13 is formed by punching a thin metal plate having elasticity such as phosphor bronze. The disk-shaped spring 13 has, for example, a spring piece 13b composed of eight bent spring pieces, and these spring pieces 13b are formed so as to be integrated by a ring-shaped joint portion 13a. . The tip of the spring piece 13b is bent in an L shape.
[0018]
Further, the coaxial plug 1 is attached to a coaxial connector 50 as shown in FIGS. This attachment is performed by rotating the rotation attachment body 12 and screwing the attachment screw portion 12b of the rotation attachment body 12 to the male screw formed on the outer peripheral surface of the coaxial connector 50. In this case, since the length of the rotary mounting body 12 is long, even if the coaxial connector 50 is provided in a series unit embedded in a wall or the like, the rotary mounting body 12 can be reliably gripped with a finger and easily Can be screwed on. When the coaxial plug 1 is attached to the coaxial connector 50, the rotary attachment body 12 and the coaxial connector 50 are electrically connected by the ring-shaped spring 14 accommodated in the spring accommodating portion 12c. The detailed structure of this ring-shaped spring 14 is shown in FIGS. 8 (a), (b) and (c). However, FIG. 8A is a plan view of the ring-shaped spring 14, FIG. 8B is a side view thereof, and FIG. 8C shows a strip-shaped metal plate for creating the ring-shaped spring. . As shown in these drawings, the ring-shaped spring 14 is formed by punching a thin metal plate having elasticity such as phosphor bronze into a strip shape as shown in FIG. 8C. Next, as shown in FIG. 8A, it is formed by bending in a ring shape. The ring-shaped spring 14 has a plurality of spring pieces 14d formed by punching a plurality of punched portions 14c. These spring pieces 14d are integrally formed by a first joining piece 14a and a second joining piece 14b. Further, the spring piece 14d is slightly bent inward so that the cross section becomes an arc shape when bent in a ring shape.
[0019]
By the way, when the coaxial plug 1 is attached to the coaxial connector 50 as shown in FIGS. 3 and 4, the braided wire 34 which is the ground of the coaxial cable 3 is connected to the cable insertion portion 11a, and the plug body 11 is a disc. It is connected to the rotary mounting body 12 via the spring 13. Further, the rotary mounting body 12 is connected to the coaxial connector 50 via the ring-shaped spring 14. As described above, in the coaxial plug 1 according to the first embodiment of the present invention, when the rotary attachment body 12 is screwed to the coaxial connector 50, the tip of the coaxial connector 50 and the tip of the coaxial plug 1 come into contact with each other. It is not configured to connect the ground via a part.
[0020]
Thus, as shown in FIG. 3, when the rotary mounting body 12 is screwed into the coaxial connector 50 without loosening and the coaxial plug 1 is attached to the coaxial connector 50, the insertion loss characteristic of the coaxial plug 1 is naturally. And the reflection loss characteristic is good over a wide band. Further, as shown in FIG. 4, even if the rotary attachment 12 is loosened with respect to the coaxial connector 50 and the coaxial plug 1 is attached to the coaxial connector 50, the braided wire 34 of the coaxial cable 3 and the coaxial connector 50 are It is ensured that the connection is made via the ring-shaped spring 13 and the ring-shaped spring 14. For this reason, even when the coaxial plug 1 is loosened, its insertion loss characteristic and reflection loss characteristic are good over a wide band.
[0021]
This will be described with reference to the graphs shown in FIGS.
FIG. 9 shows insertion loss characteristics when the coaxial plug 1 according to the first embodiment of the present invention is securely screwed to the coaxial connector 50 as shown in FIG. Referring to this figure, it can be seen that the insertion loss is about 0.5 dB or less over a wide band up to 2.5 GHz. FIG. 10 shows reflection loss characteristics when the coaxial plug 1 according to the first embodiment of the present invention is securely screwed to the coaxial connector 50. Referring to this figure, it can be seen that the reflection loss is about 20 dB or more over a wide band up to 2.5 GHz. However, in this case, the coaxial plug 1 is attached to the tip of the coaxial cable 3 of about 1 m, and a standing wave is generated in the coaxial cable 3, so that the reflection loss characteristic is a characteristic that periodically pulsates.
[0022]
Next, FIG. 11 shows the insertion loss characteristics when the coaxial plug 1 according to the first embodiment of the present invention is attached to the coaxial connector 50 with one turn loosened. Referring to this figure, it can be seen that the insertion loss is about 0.5 dB or less over a wide band up to 2.5 GHz despite being loosely attached. FIG. 12 shows the reflection loss characteristics when the coaxial plug 1 according to the first embodiment of the present invention is attached to the coaxial connector 50 with one turn loosened. Referring to this figure, it can be seen that the reflection loss is about 20 dB or more over a wide band up to 2.5 GHz despite being loosely attached. However, also in this case, the coaxial plug 1 is attached to the tip of the coaxial cable 3 of about 1 m, and a standing wave is generated in the coaxial cable 3, so that the reflection loss characteristic is a characteristic that pulsates periodically.
[0023]
Next, FIG. 13 shows insertion loss characteristics when the coaxial plug 1 according to the first embodiment of the present invention is simply inserted into the coaxial connector 50 without screwing. Referring to this figure, it can be seen that the insertion loss is about 0.6 dB or less over a wide band up to 2.5 GHz even though it is not screwed. FIG. 14 shows the reflection loss characteristics when the coaxial plug 1 according to the first embodiment of the present invention is simply inserted into the coaxial connector 50 without being screwed. Referring to this figure, it can be seen that the reflection loss is about 18 dB or more over a wide band up to 2.5 GHz even though it is not screwed. However, in this case as well, the coaxial plug 1 is attached to the tip of the coaxial cable 3 of about 1 m, and since a standing wave is generated in the coaxial cable 3, the reflection loss characteristic is a characteristic that pulsates periodically.
[0024]
Next, a second configuration example of the embodiment of the coaxial plug according to the present invention will be described. However, since the external appearance of the coaxial plug of the second embodiment is the same as the external appearance of the coaxial plug of the first embodiment shown in FIG.
FIG. 15 shows an exploded view of the coaxial plug according to the second embodiment of the present invention. Further, FIG. 16 shows a sectional view when the coaxial plug according to the second embodiment of the present invention is securely attached to the coaxial connector, and FIG. 17 shows a sectional view when it is loosely attached. Furthermore, the structure of the plug main body and the rotary mounting body constituting the coaxial plug according to the second embodiment of the present invention is shown in FIGS. Hereinafter, a second configuration example of the embodiment of the coaxial plug according to the present invention will be described based on these drawings.
[0025]
The coaxial plug 100 according to the second embodiment of the present invention includes a plug body 111 made of metal and a rotary attachment body 112 that is rotatably attached to the plug body 111. As shown in FIGS. 15 and 18, the plug body 111 has a ring-shaped portion 111 c formed in a ring shape, and a curling process that is formed so as to protrude from one surface of the ring-shaped portion 111 c and rotatably supports the rotary attachment body 112. The cable insertion part 111a formed so that it might protrude from the other surface of the part 111f and the ring-shaped part 111c is provided. The plug body 111 is formed with a through hole substantially along the central axis throughout. Furthermore, the cable insertion part 111a is formed so that the diameter becomes thinner as going forward, and is a part inserted between the inner insulator of the coaxial cable and the braided wire. At the tip of the cable insertion portion 111a, a retaining portion 111b having a sawtooth cross section for locking so as not to come out of the coaxial cable is formed in a ring shape. A flange 111e protruding in a ring shape is formed at one end edge of the outer peripheral surface of the ring-shaped portion 111c. The flange 111e is a flange for locking the first ring-shaped spring 113 fitted to the outer peripheral surface of the ring-shaped portion 111c so as not to come out. Further, a cable contact groove 111d with which the tip of the attached coaxial cable contacts is formed on the other surface of the ring-shaped portion 111c.
[0026]
The rotating attachment body 112 made of metal is formed in a cylindrical shape, and a non-slip knurling process is applied to the outer periphery thereof. As shown in FIGS. 15 and 19, a mounting screw portion 112 b that is screwed to the coaxial connector is cut at a substantially central portion of the inner peripheral surface of the rotary mounting body 112. A first ring-shaped spring 113 is housed at one end of the inner peripheral surface of the rotary attachment body 112, and a body housing portion 112a in which the ring-shaped portion 111c of the plug body 111 is housed. A rotation engaging portion 112d protruding inward is formed between the main body storage portion 112a and the mounting screw portion 112b. The rotation engaging portion 112d is a portion that is rotatably engaged with the curling portion 111f when the curling portion 111f of the plug body 111 is curled. Further, a second spring accommodating portion 112 c for accommodating the second ring-shaped spring 114 is formed at the other end portion of the inner peripheral surface of the rotary attachment body 112. A locking projection 112e that locks the second ring-shaped spring 114 stored so as not to come out is formed in a ring shape at the tip of the second spring storage portion 112c.
[0027]
Then, as shown in FIG. 15, the first ring-shaped spring 113 is fitted on the outer peripheral surface of the ring-shaped portion 111c of the plug main body 111 in the state shown in FIG. By inserting, the ring-shaped part 111c by which the 1st ring-shaped spring 113 was fitted by the main body accommodating part 112a is inserted. In this state, when the curl processing portion 111f is curled so as to curl outward, the curled processing portion 111f after processing is rotatably engaged with the rotation engagement portion 112d as shown in FIGS. It becomes like this. Next, the coaxial plug 100 can be assembled by fitting the second ring-shaped spring 114 into the second spring accommodating portion 112 c of the rotary attachment body 112.
[0028]
Since the process of attaching the coaxial plug 100 to the coaxial cable 3 is the same as that of the coaxial plug 1 according to the first embodiment of the present invention described above, the description thereof is omitted.
In the coaxial plug 100 according to the second embodiment of the present invention, the electrical connection between the ring-shaped portion 111c and the rotary mounting body 112 is performed by the first ring-shaped spring 113 interposed therebetween. Thereby, the electrical connection of the ring-shaped part 111c and the rotation attachment body 112 is performed reliably. The first ring spring 113 has the same configuration as that of the ring spring 14 shown in FIG.
Further, the coaxial plug 100 of the second embodiment is attached to the coaxial connector 50 as shown in FIGS. 16 and 17. At this time, the mounting screw portion 112 b of the rotary mounting body 112 is screwed to a male screw formed on the outer peripheral surface of the coaxial connector 50. At this time, the rotary mounting body 112 and the coaxial connector 50 are electrically connected by the second ring-shaped spring 114 housed in the second spring housing portion 112c. Since the second ring-shaped spring 114 has the same configuration as that of the ring-shaped spring 14 shown in FIG. 8, detailed description thereof is omitted.
[0029]
When the coaxial plug 100 of the second embodiment is attached to the coaxial connector 50 as shown in FIGS. 16 and 17, the braided wire 34 that is the ground of the coaxial cable 3 is connected to the cable insertion portion 111a. The plug body 111 is connected to the rotary mounting body 112 via the first ring-shaped spring 113. Further, the rotary mounting body 112 is connected to the coaxial connector 50 via the second ring-shaped spring 114. Thus, in the coaxial plug 100 according to the second embodiment of the present invention, when the rotary attachment body 112 is screwed to the coaxial connector 50, the tip of the coaxial connector 50 and the tip of the coaxial plug 100 abut. Therefore, it is not configured to connect the ground. When the coaxial plug 100 is attached to the coaxial connector 50, the attachment portion 112 b of the rotation attachment body 112 is screwed to the male screw formed on the outer peripheral surface of the coaxial connector 50 by rotating the attachment body 112. Is done. In this case, since the length of the rotary mounting body 112 is long, even if the coaxial connector 50 is provided in a series unit embedded in a wall or the like, the rotary mounting body 112 can be securely gripped with a finger and easily Can be screwed on.
[0030]
As shown in FIG. 16, when the rotary attachment body 112 is screwed to the coaxial connector 50 without loosening and the coaxial plug 100 is attached to the coaxial connector 50, it is natural that the insertion loss characteristic and reflection loss of the coaxial plug 100 are obtained. The characteristics are good over a wide band. In addition, even if the rotary attachment body 112 is loosened and screwed to the coaxial connector 50 and the coaxial plug 100 is attached to the coaxial connector 50 as shown in FIG. 17, the braided wire 34 of the coaxial cable 3 and the coaxial connector 50 Are securely connected via the first ring-shaped spring 113 and the second ring-shaped spring 114. For this reason, even when the coaxial plug 100 is loosened, its insertion loss characteristic and reflection loss characteristic are good over a wide band.
[0031]
This will be described with reference to the graphs shown in FIGS.
FIG. 20 shows insertion loss characteristics when the coaxial plug 100 according to the second embodiment of the present invention is securely screwed to the coaxial connector 50 as shown in FIG. Referring to this figure, it can be seen that the insertion loss is about 0.5 dB or less over a wide band up to 2.5 GHz. FIG. 21 shows the reflection loss characteristics when the coaxial plug 100 according to the second embodiment of the present invention is securely screwed to the coaxial connector 50. Referring to this figure, it can be seen that the reflection loss is about 23 dB or more over a wide band up to 2.5 GHz. However, in this case, the coaxial plug 100 is attached to the tip of the coaxial cable 3 of about 1 m, and since the standing wave is generated in the coaxial cable 3, the reflection loss characteristic is a characteristic that pulsates periodically.
[0032]
Next, FIG. 22 shows insertion loss characteristics when the coaxial plug 100 according to the second embodiment of the present invention is attached to the coaxial connector 50 with one turn loosened. Referring to this figure, it can be seen that the insertion loss is about 0.5 dB or less over a wide band up to 2.5 GHz despite being loosely attached. FIG. 23 shows the reflection loss characteristics when the coaxial plug 100 according to the second embodiment of the present invention is attached to the coaxial connector 50 with one turn loosened. Referring to this figure, it can be seen that the reflection loss is about 22 dB or more over a wide band up to 2.5 GHz despite being loosely attached. However, also in this case, the coaxial plug 100 is attached to the tip of the coaxial cable 3 of about 1 m, and a standing wave is generated in the coaxial cable 3, so that the reflection loss characteristic is a characteristic that pulsates periodically.
[0033]
Next, FIG. 24 shows insertion loss characteristics when the coaxial plug 100 according to the second embodiment of the present invention is simply inserted into the coaxial connector 50 without screwing. Referring to this figure, it can be seen that the insertion loss is as good as about 0.5 dB or less over a wide band up to 2.5 GHz even though it is not screwed. FIG. 25 shows the reflection loss characteristics when the coaxial plug 100 according to the second embodiment of the present invention is simply inserted into the coaxial connector 50 without screwing. Referring to this figure, it can be seen that the reflection loss is about 20 dB or more over a wide band up to 2.5 GHz although it is not screwed. However, also in this case, the coaxial plug 100 is attached to the tip of the coaxial cable 3 of about 1 m, and a standing wave is generated in the coaxial cable 3, so that the reflection loss characteristic is a characteristic that pulsates periodically.
[0034]
Next, the 3rd structural example of embodiment of the coaxial plug of this invention is demonstrated. However, since the external appearance of the coaxial plug of the third embodiment is the same as the external appearance of the coaxial plug of the first embodiment shown in FIG.
FIG. 26 shows an exploded view of the coaxial plug according to the third embodiment of the present invention. Further, FIG. 27 shows a cross-sectional view when the coaxial plug according to the third embodiment of the present invention is securely attached to the coaxial connector, and FIG. 28 shows a cross-sectional view when it is loosely attached. Furthermore, FIG. 29 shows the configuration of the rotary mounting body constituting the coaxial plug according to the third embodiment of the present invention. Hereinafter, a third configuration example of the embodiment of the coaxial plug according to the present invention will be described based on these drawings.
[0035]
The coaxial plug according to the third embodiment of the present invention includes a plug main body 211 made of metal and a rotary attachment body 212 that is rotatably attached to the plug main body 211. The plug main body 211 has the same configuration as that of the plug main body 111 according to the second embodiment shown in FIG. 18, and includes a ring-shaped portion 211c formed in a ring shape as shown in FIG. The curl processing part 211f which protrudes from one surface of 211c and supports the rotation attachment body 212 rotatably is provided, and the cable insertion part 211a formed so that it may protrude from the other surface of the ring-shaped part 211c. The plug body 211 is formed with a through hole substantially along the central axis throughout. Furthermore, the cable insertion part 211a is formed so that the diameter becomes thinner as going forward, and is a part inserted between the inner insulator of the coaxial cable and the braided wire. At the tip of the cable insertion portion 211a, a retaining portion 211b having a sawtooth cross section for locking so as not to come out of the coaxial cable is formed in a ring shape. A flange portion 211e protruding in a ring shape is formed at one end edge of the outer peripheral surface of the ring-shaped portion 211c. The flange portion 211e is a flange portion for locking the first ring-shaped spring 213 fitted on the outer peripheral surface of the ring-shaped portion 211c so as not to come out. Further, a cable contact groove 211d with which the tip of the attached coaxial cable contacts is formed on the other surface of the ring-shaped portion 211c.
[0036]
The rotational attachment body 212 made of metal is formed in a cylindrical shape, and a non-slip knurling process is applied to the outer periphery thereof. As shown in FIGS. 26 and 29, a second spring storage portion 212c in which the second ring-shaped spring 214 is stored is formed at a substantially central portion of the inner peripheral surface of the rotary mounting body 212. The second spring storage portion 212c is formed with a locking step portion 212e that locks the stored second ring-shaped spring 214 so as not to come out, so that a ring-shaped groove portion is formed. In addition, a first ring-shaped spring 213 is stored at one end of the inner peripheral surface of the rotary mounting body 212, and a main body storage portion 212a in which the ring-shaped portion 211c of the plug main body 211 is stored. A rotation engaging portion 212d protruding inward is formed between the main body storage portion 212a and the second spring storage portion 212c. The rotation engaging portion 212d is a portion that is rotatably engaged with the curling portion 211f when the curling portion 211f of the plug body 211 is curled. Further, an attachment screw portion 212b that is screwed to the coaxial connector is formed at the other end portion of the inner peripheral surface of the rotary attachment body 212.
[0037]
Then, as shown in FIG. 26, with the first ring-shaped spring 213 fitted on the outer peripheral surface of the ring-shaped portion 211c of the plug main body 211, the main body is inserted into the rotary mounting body 212 from the curled portion 211f side. The ring-shaped part 211c with the first ring-shaped spring 213 fitted is inserted into the storage part 212a. In this state, when the curl processing unit 211f is curled so as to curl outward, the processed curl processing unit 211f is rotatably engaged with the rotation engagement unit 212d as shown in FIGS. It becomes like this. Next, the coaxial plug 200 can be assembled by fitting the second ring-shaped spring 214 into the second spring accommodating portion 212 c of the rotary attachment body 212.
[0038]
Since the process of attaching the coaxial plug 200 to the coaxial cable 3 is the same as that of the coaxial plug 1 of the first embodiment of the present invention described above, the description thereof is omitted.
In the coaxial plug 200 according to the third embodiment of the present invention, the electrical connection between the ring-shaped portion 211c and the rotary mounting body 212 is performed by the first ring-shaped spring 213. Thereby, the electrical connection of the ring-shaped part 211c and the rotation attachment body 212 is performed reliably. The first ring-shaped spring 213 has the same configuration as that of the ring-shaped spring 14 shown in FIG.
Further, the coaxial plug 200 of the third embodiment is attached to the coaxial connector 50 as shown in FIGS. At this time, the mounting screw portion 212 b of the rotary mounting body 212 is screwed to a male screw formed on the outer peripheral surface of the coaxial connector 50. At this time, the rotary attachment 212 and the coaxial connector 50 are electrically connected by the second ring-shaped spring 214 housed in the second spring housing portion 212c. Since the second ring-shaped spring 214 has the same configuration as that of the ring-shaped spring 14 shown in FIG. 8, detailed description thereof is omitted.
In the coaxial plug 200 according to the third embodiment of the present invention, since the mounting screw portion 212b is formed at the end of the rotary mounting body 212, as shown in FIGS. 27 and 28, the mounting screw portion 212b. And the coaxial connector 50 can be lengthened so that the coaxial plug 200 does not fall out even if the coaxial plug 200 is loosened.
[0039]
By the way, as shown in FIGS. 27 and 28, when the coaxial plug 200 of the third embodiment is attached to the coaxial connector 50, the braided wire 34 that is the ground of the coaxial cable 3 is connected to the cable insertion portion 211a. The plug body 211 is connected to the rotary mounting body 212 via the first ring-shaped spring 213. Further, the rotary attachment body 212 is connected to the coaxial connector 50 via the second ring-shaped spring 214. As described above, in the coaxial plug 200 according to the third embodiment of the present invention, when the rotary mounting body 212 is screwed to the coaxial connector 50, the tip of the coaxial connector 50 and the tip of the coaxial plug 200 abut. Therefore, the ground is not connected. When the coaxial plug 200 is attached to the coaxial connector 50, the rotational attachment body 212 is rotated so that the attachment screw portion 212b of the rotational attachment body 212 is screwed to the male screw formed on the outer peripheral surface of the coaxial connector 50. Is done. In this case, since the length of the rotary mounting body 212 is long, even if the coaxial connector 50 is provided in a series unit embedded in a wall or the like, the rotary mounting body 212 can be securely gripped with a finger and easily Can be screwed on.
[0040]
As shown in FIG. 27, when the rotary attachment 212 is screwed to the coaxial connector 50 without loosening and the coaxial plug 200 is attached to the coaxial connector 50, it is natural that the insertion loss characteristic and reflection loss of the coaxial plug 200 are obtained. The characteristics are good over a wide band. 28, the braided wire 34 and the coaxial connector 50 of the coaxial cable 3 can be attached to the coaxial connector 50 by loosening and screwing the rotary mounting body 212 to the coaxial connector 50. Are securely connected via the first ring-shaped spring 213 and the second ring-shaped spring 214. For this reason, even when the coaxial plug 200 is loosened, its insertion loss characteristic and reflection loss characteristic are good over a wide band.
[0041]
This will be described with reference to the graphs shown in FIGS.
FIG. 30 shows insertion loss characteristics when the coaxial plug 200 according to the third embodiment of the present invention is securely screwed to the coaxial connector 50 as shown in FIG. Referring to this figure, it can be seen that the insertion loss is about 0.5 dB or less over a wide band up to 2.5 GHz. FIG. 31 shows the reflection loss characteristics when the coaxial plug 200 according to the third embodiment of the present invention is securely screwed to the coaxial connector 50. Referring to this figure, it can be seen that the reflection loss is about 21 dB or more over a wide band up to 2.5 GHz. However, in this case, the coaxial plug 200 is attached to the tip of the coaxial cable 3 of about 1 m, and since the standing wave is generated in the coaxial cable 3, the reflection loss characteristic is a characteristic that pulsates periodically.
[0042]
Next, FIG. 32 shows insertion loss characteristics when the coaxial plug 200 according to the third embodiment of the present invention is attached to the coaxial connector 50 with one turn loosened. Referring to this figure, it can be seen that the insertion loss is about 0.5 dB or less over a wide band up to 2.5 GHz despite being loosely attached. FIG. 33 shows the reflection loss characteristics when the coaxial plug 200 according to the third embodiment of the present invention is attached to the coaxial connector 50 with one turn loosened. Referring to this figure, it can be seen that the reflection loss is about 20 dB or more over a wide band up to 2.5 GHz despite being loosely attached. However, also in this case, the coaxial plug 200 is attached to the tip of the coaxial cable 3 of about 1 m, and a standing wave is generated in the coaxial cable 3, so that the reflection loss characteristic is a characteristic that pulsates periodically.
[0043]
As described above, in the coaxial plug according to the present invention, the electrical connection between the plug main body and the rotary mounting body is performed by the disc-shaped spring or the ring-shaped spring interposed therebetween. Further, the rotary attachment body and the coaxial connector are electrically connected by a ring-shaped spring interposed therebetween. For this reason, when the coaxial plug concerning this invention is attached to a coaxial connector, the electrical connection of a coaxial connector and a plug main body can be performed by the disk-shaped spring or ring-shaped spring interposed therebetween. Therefore, even if the rotary mounting body is loosened with respect to the coaxial connector, the electrical connection between the coaxial connector and the plug body can be reliably performed by the disc spring or the ring spring, so that the electrical characteristics of the coaxial plug deteriorate. Can be prevented. In addition, the spring which interposes between a coaxial connector and a plug main body, and performs both electrical connection is not restricted to a disk-shaped spring or a ring-shaped spring, The spring of the other shape which can be interposed between them It may be.
[0044]
【The invention's effect】
As described above, according to the present invention, the plug body and the rotary mounting body are connected by the disc-shaped spring or the ring-shaped spring, and the rotary mounting body and the coaxial connector as the mounted body are connected by the ring-shaped spring. As a result, it is possible to prevent the ground connection from being incomplete even if the rotary mounting body is loosened. For this reason, even if the coaxial plug is loosened with respect to the coaxial connector, the electrical characteristics of the coaxial plug do not deteriorate.
In this way, the ground connection can be prevented from being incomplete with a simple configuration by using a disk-shaped spring and a ring-shaped spring, or by using two ring-shaped springs. Therefore, an increase in cost can be suppressed as much as possible.
Further, since the entire length of the rotary attachment body becomes long, it becomes easy to operate the rotary attachment body with a finger, and the coaxial plug can be easily attached to the coaxial connector embedded in a wall or the like.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first configuration example of an embodiment of a coaxial plug according to the present invention.
FIG. 2 is an exploded view of the coaxial plug according to the first embodiment of the present invention.
FIG. 3 is a diagram showing a state in which the coaxial plug according to the first embodiment of the present invention is securely attached to the coaxial connector.
FIG. 4 is a diagram showing a state in which the coaxial plug according to the first embodiment of the present invention is loosened and attached to the coaxial connector.
FIG. 5 is a diagram showing a detailed configuration of a plug body in the coaxial plug according to the first embodiment of the present invention.
FIG. 6 is a diagram showing a detailed configuration of a rotary attachment body in the coaxial plug according to the first embodiment of the present invention.
FIG. 7 is a diagram showing a detailed configuration of a disc spring in the coaxial plug according to the first embodiment of the present invention.
FIG. 8 is a diagram showing a detailed configuration of a ring-shaped spring in the coaxial plug according to the first embodiment of the present invention.
FIG. 9 is a diagram showing insertion loss characteristics when the coaxial plug according to the first embodiment of the present invention is securely attached to the coaxial connector.
FIG. 10 is a diagram showing a reflection loss characteristic when the coaxial plug according to the first embodiment of the present invention is securely attached to the coaxial connector.
FIG. 11 is a diagram showing insertion loss characteristics when the coaxial plug according to the first embodiment of the present invention is attached to the coaxial connector with one turn loosened.
FIG. 12 is a diagram showing a reflection loss characteristic when the coaxial plug according to the first embodiment of the present invention is attached to the coaxial connector with one turn loosened.
FIG. 13 is a diagram showing insertion loss characteristics when the coaxial plug according to the first embodiment of the present invention is simply inserted into the coaxial connector.
FIG. 14 is a diagram showing the reflection loss characteristic when the coaxial plug according to the first embodiment of the present invention is simply inserted into the coaxial connector.
FIG. 15 is an exploded view of a coaxial plug according to a second embodiment of the present invention.
FIG. 16 is a diagram showing a state in which the coaxial plug according to the second embodiment of the present invention is securely attached to the coaxial connector.
FIG. 17 is a view showing a state where the coaxial plug according to the second embodiment of the present invention is loosely attached to the coaxial connector.
FIG. 18 is a diagram showing a detailed configuration of a plug body in a coaxial plug according to a second embodiment of the present invention.
FIG. 19 is a diagram showing a detailed configuration of a rotary attachment body in the coaxial plug according to the second embodiment of the present invention.
FIG. 20 is a diagram showing insertion loss characteristics when the coaxial plug according to the second embodiment of the present invention is securely attached to the coaxial connector.
FIG. 21 is a diagram showing reflection loss characteristics when the coaxial plug according to the second embodiment of the present invention is securely attached to the coaxial connector.
FIG. 22 is a diagram showing an insertion loss characteristic when the coaxial plug according to the second embodiment of the present invention is attached to the coaxial connector with one turn loosened.
FIG. 23 is a diagram showing a reflection loss characteristic when the coaxial plug according to the second embodiment of the present invention is attached to the coaxial connector with one turn loosened.
FIG. 24 is a diagram showing insertion loss characteristics when the coaxial plug according to the second embodiment of the present invention is simply inserted into the coaxial connector.
FIG. 25 is a diagram showing the reflection loss characteristic when the coaxial plug according to the second embodiment of the present invention is simply inserted into the coaxial connector.
FIG. 26 is an exploded view of a coaxial plug according to a third embodiment of the present invention.
FIG. 27 is a diagram showing a state in which the coaxial plug according to the third embodiment of the present invention is securely attached to the coaxial connector.
FIG. 28 is a diagram showing a state where the coaxial plug according to the third embodiment of the present invention is loosely attached to the coaxial connector.
FIG. 29 is a diagram showing a detailed configuration of a rotary attachment body in a coaxial plug according to a third embodiment of the present invention.
FIG. 30 is a diagram showing insertion loss characteristics when the coaxial plug according to the third embodiment of the present invention is securely attached to the coaxial connector.
FIG. 31 is a diagram showing reflection loss characteristics when the coaxial plug according to the third embodiment of the present invention is securely attached to the coaxial connector.
FIG. 32 is a diagram showing an insertion loss characteristic when the coaxial plug according to the third embodiment of the present invention is attached to the coaxial connector with one turn loosened.
FIG. 33 is a diagram showing a reflection loss characteristic when the coaxial plug according to the third embodiment of the present invention is attached to the coaxial connector by loosening one turn.
FIG. 34 is a diagram showing a configuration of a conventional coaxial plug.
FIG. 35 is a diagram showing insertion loss characteristics when a conventional coaxial plug is securely attached to a coaxial connector.
FIG. 36 is a diagram showing reflection loss characteristics when a conventional coaxial plug is securely attached to a coaxial connector.
FIG. 37 is a diagram showing insertion loss characteristics when a conventional coaxial plug is loosened and attached to a coaxial connector by one turn.
FIG. 38 is a diagram showing reflection loss characteristics when a conventional coaxial plug is loosened and attached to a coaxial connector once.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coaxial plug, 2 Caulking ring, 3 Coaxial cable, 11 Plug main body, 11a Cable insertion part, 11b Detachment part, 11c Ring-shaped part, 11d Cable contact groove, 11e Spring storage groove, 11f Curl processing part, 12 Rotation attachment body , 12a body housing portion, 12b mounting screw portion, 12c spring housing portion, 12d rotation engaging portion, 12e locking projection, 13 disc spring, 13a ring joint, 13b spring piece, 14 ring spring, 14a first 1 joint piece, 14b 2nd joint piece, 14c punching part, 14d spring piece, 31 outer sheath, 32 internal insulator, 33 core wire, 34 braided wire, 50 coaxial connector, 100 coaxial plug, 111 plug body, 111a cable insertion part , 111b retaining portion, 111c ring-shaped portion, 111d cable contact groove, 1 1e collar part, 111f curl processing part, 112 rotation attachment body, 112a main body storage part, 112b attachment screw part, 112c spring storage part, 112d rotation engagement part, 112e locking projection, 113 first ring spring, 114 second Ring-shaped spring, 200 coaxial plug, 211 plug body, 211a cable insertion part, 211b retaining part, 211c ring-shaped part, 211d cable abutment groove, 211e collar part, 211f curl processing part, 212 rotating attachment body, 212a body housing part , 212b Mounting screw part, 212c Spring storage part, 212d Rotating engagement part, 212e Locking step part, 213 First ring spring, 214 Second ring spring, 300 Coaxial plug, 302 Caulking ring, 311 Plug body, 311a Cable insertion part, 311b , 311 c ring-shaped portion, 311 d cable skilled Semmizo, 311f protrusion 312 rotating mount

Claims (6)

There is a coaxial plug attached to the end of the coaxial cable,
A ring-shaped portion; a cylindrical curled portion formed so as to protrude from one surface of the ring-shaped portion; A plug body including a cable insertion portion that can be inserted between the wires, and
A disc-shaped spring housed in a spring housing groove formed on one surface of the ring-shaped portion;
It is formed in a substantially cylindrical shape, and includes a rotation engaging portion and a mounting screw portion protruding inwardly formed at a substantially central portion of the inner peripheral surface, and the ring-shaped portion formed at one end portion of the inner peripheral surface. A rotary mounting body including a main body storage portion to be stored and a spring storage portion formed at the other end of the inner peripheral surface;
A ring-shaped spring housed in the spring housing section,
The curled portion that is curled is rotatably engaged with the rotation engaging portion, and the rotary attachment body is rotatable with respect to the plug body, and the disc-shaped spring is the ring Interposed between the one surface of the ring-shaped portion and the rotation engaging portion of the rotary mounting body, and electrical connection between the two is performed by the disk-shaped spring, and the mounting screw portion of the rotary mounting body is a coaxial connector The coaxial plug is characterized in that, when screwed into a male screw formed on the outer peripheral surface of the ring, electrical connection between the rotary attachment body and the coaxial connector is made by the ring-shaped spring .   The coaxial plug according to claim 1, wherein the ring-shaped spring is formed by bending a metal plate having a belt-like elasticity into a ring shape. There is a coaxial plug attached to the end of the coaxial cable,
A ring-shaped portion; a cylindrical curled portion formed so as to protrude from one surface of the ring-shaped portion; A plug body including a cable insertion portion that can be inserted between the wires, and
Formed in a substantially cylindrical shape, formed in a substantially central portion of the inner peripheral surface thereof and projecting inwardly into a rotation engaging portion and a mounting screw portion; a main body storage portion formed at one end portion of the inner peripheral surface; A rotary mounting body comprising a spring storage portion formed at the other end of the inner peripheral surface;
A first ring-shaped spring that is housed in the main body housing portion in a state of being inserted into the outer peripheral surface of the ring-shaped portion;
A second ring-shaped spring housed in the spring housing section,
The curled portion that has been curled is rotatably engaged with the rotation engaging portion, and the rotary attachment body is rotatable with respect to the plug body, and the first ring-shaped spring is Between the outer peripheral surface of the ring-shaped portion and the inner peripheral surface of the rotary mounting body, electrical connection between them is made by the first ring-shaped spring, and the mounting screw portion of the rotary mounting body is coaxial. A coaxial plug, wherein the second ring-shaped spring makes electrical connection between the rotary attachment body and the coaxial connector when screwed into a male screw formed on an outer peripheral surface of the connector .   4. The coaxial plug according to claim 1, wherein a locking projection for locking a spring housed in the spring housing portion is formed at a tip of the spring housing portion. There is a coaxial plug attached to the end of the coaxial cable,
A ring-shaped portion; a cylindrical curled portion formed so as to protrude from one surface of the ring-shaped portion; A plug body including a cable insertion portion that can be inserted between the wires, and
Formed in a substantially cylindrical shape, formed in a substantially central portion of the inner peripheral surface thereof, and projecting to the inside, a spring storage portion, a main body storage portion formed at one end of the inner peripheral surface, A rotating mounting body comprising a mounting screw portion formed on the other end of the inner peripheral surface;
A first ring-shaped spring that is housed in the main body housing portion in a state of being inserted into the outer peripheral surface of the ring-shaped portion;
A second ring-shaped spring housed in the spring housing section,
The curled portion that has been curled is rotatably engaged with the rotation engaging portion, and the rotary attachment body is rotatable with respect to the plug body, and the first ring-shaped spring is Between the outer peripheral surface of the ring-shaped portion and the inner peripheral surface of the rotary mounting body, electrical connection between them is made by the first ring-shaped spring, and the mounting screw portion of the rotary mounting body is coaxial. A coaxial plug, wherein the second ring-shaped spring makes electrical connection between the rotary attachment body and the coaxial connector when screwed into a male screw formed on an outer peripheral surface of the connector .   6. The coaxial plug according to claim 3, wherein the ring-shaped spring is formed by bending a metal plate having a belt-like elasticity into a ring shape.

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