JP4283555B2 - Coaxial connector - 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]
Receiver devices such as televisions and satellite broadcasting tuners are equipped with coaxial connectors as input and output terminals for high-frequency signals, and coaxial connectors attached to the end of coaxial cables are attached to these coaxial connectors. Thus, the received signal is input / output. In this case, a signal (IF signal) converted to an intermediate frequency by the satellite antenna is input to the satellite broadcast tuner. This IF signal is generally output from a coaxial connector provided in a series unit provided on a wall or the like, and a coaxial cable having coaxial connectors attached to both ends between the series unit and a satellite broadcast tuner. Get connected.
[0003]
A configuration example of a conventional coaxial plug attached to the tip of the coaxial cable will be described with reference to process diagrams of attaching to the coaxial cable shown in FIGS. 8 (a), (b), (c), and (d). However, FIG. 8A is a diagram showing a first step of processing a coaxial cable to which a conventional coaxial plug is attached, and FIG. 8B is a diagram showing the second step, and FIG. ) Is a diagram showing a first step of attaching the coaxial cable to the distal end, and FIG. 8D is a cross-sectional view showing a conventional coaxial plug attached to the distal end of the coaxial cable.
[0004]
When the conventional coaxial plug 100 is attached to the tip of the coaxial cable 120, the jacket 121 at the tip of the coaxial cable 120 is cut to a predetermined length to expose the braided wire 122 as shown in FIG. Let Next, as shown in FIG. 8B, the braided wire 122 is folded back on the outer cover 121 and cut away leaving a predetermined length, thereby exposing the insulator 123 positioned inside the braided wire 122. Then, the insulator 123 is cut by a predetermined length, and the core wire 124 located inside the insulator 123 is exposed by a predetermined length. In this state, as shown in FIG. 8 (c), between the insulator 123 and the braided wire 122, an elongated insertion portion 110a formed on the main body portion 110 of the coaxial connector 100 is inserted from the tip. This insertion is performed until the front end of the jacket 121 where the braided wire 122 of the coaxial cable 120 is folded back contacts the ring-shaped recess 110b formed in the main body 110 as shown in FIG. 8 (d). Is done. Next, the caulking ring 130 that has been inserted into the coaxial cable 120 is positioned on the insertion portion 110 a of the main body 110 and is caulked.
[0005]
As a result, the coaxial plug 100 does not come out of the coaxial cable 120 by the action of the tapered portion formed at the distal end of the insertion portion 110 a of the main body 110 and the caulking ring 130. A rotating part 111 is rotatably mounted on the main body part 110 of the coaxial connector 100, and the core wire 124 of the coaxial cable 120 is positioned substantially on the central axis of the rotating part 111. Therefore, the coaxial plug 100 is attached to the coaxial connector by rotating the rotating portion 111 so that the core wire 124 is inserted into the central contact of the coaxial connector.
[0006]
[Problems to be solved by the invention]
By the way, when the conventional coaxial plug 100 is attached to the tip of the coaxial cable 120, the coaxial plug 100 is fixed to the coaxial cable 120 using the caulking ring 130, and therefore the caulking ring 130 has been caulked once. However, there is a problem that it is difficult to remove the coaxial plug 100 from the coaxial cable 120. Further, there is a problem in that a caulking tool such as pliers or pliers is required to caulk the caulking ring 130. Furthermore, when the insertion portion 110a extending from the main body portion 110 of the coaxial connector 100 is inserted between the insulator 123 and the braided wire 122, the braided wire 122 may be damped in one place. In such a case, there is a problem in that impedance mismatch occurs in that portion and high frequency characteristics deteriorate.
[0007]
Therefore, the present invention provides a coaxial connector that can easily remove the coaxial connector attached to the coaxial cable and can fix the coaxial connector to the coaxial cable without requiring a special tool. The purpose is that.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the coaxial plug of the present invention is a coaxial plug that is attached to the tip of the coaxial cable and has a through hole formed throughout, and is formed in a cylindrical shape. An asymmetric threaded portion formed on the inner peripheral surface of the asymmetric thread portion formed so that the inclination toward the outer side is looser than the inclination toward the rotating portion is rotatably fixed to the tip of the main body portion, and is attached to the coaxial connector. A rotating portion that can be mounted, and by screwing the asymmetric screw portion in the main body portion into the coaxial cable, the coaxial cable enters the through-hole, and the braided wire of the coaxial cable becomes the main body portion. The core wire exposed from the tip of the coaxial cable is arranged substantially along the central axis of the rotating portion.
[0009]
In the coaxial plug of the present invention, anti-slip means may be provided on the outer peripheral surface of the main body.
Furthermore , in the coaxial connector according to the present invention, the top of the asymmetric thread portion may have a smooth shape.
[0010]
According to the present invention, the coaxial plug can be fixed to the coaxial cable by screwing the asymmetric screw portion formed on the inner peripheral surface of the main body portion into the coaxial cable. Therefore, by rotating in the opposite direction to the time when the coaxial connector fixed to the coaxial cable is attached, the coaxial connector can be removed from the coaxial cable, and the coaxial connector can be reused. . In this case, since the inclination toward the outside in the asymmetric screw portion is made gentler than the inclination toward the rotation portion, the torque at the time of attaching the coaxial plug can be reduced and the torque at the time of removal can be increased. As a result, it becomes difficult to reversely rotate, and the fixing force of the coaxial plug to the coaxial cable can be improved, and the coaxial plug can be prevented from being accidentally detached from the coaxial cable.
[0011]
In addition, since the top of the asymmetric screw portion has a rounded and smooth shape, it is possible to prevent the braided wire folded on the outer cover of the coaxial cable from being cut when the asymmetric screw portion is screwed. it can. Furthermore, since the main body can be rotated by gripping it by hand, the coaxial plug can be attached to the coaxial cable without requiring any special tool. Furthermore, since the coaxial plug can be fixed to the coaxial cable without inserting anything between the braided wire of the coaxial cable and the insulator, the high frequency characteristics are deteriorated even if the coaxial plug is attached to the coaxial cable. Can be prevented.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The configuration of the coaxial connector according to the embodiment of the present invention is shown in FIGS. However, FIG. 1 is a perspective view seen from the front showing the configuration of the coaxial plug according to the embodiment of the present invention, FIG. 2 is a perspective view seen from the rear showing the configuration, and FIG. FIG. 4 is an enlarged view of a part A thereof.
As shown in these drawings, the coaxial connector 1 according to the embodiment of the present invention includes a cylindrical main body 10 made of metal, and a metal rotating part that is rotatably fixed to the main body 10. 11 and a through hole 1a is formed substantially along the central axis. An asymmetric screw part 10 b is formed on the inner peripheral surface of the main body part 10. As shown in FIG. 4, the asymmetric threaded portion 10b has different thread inclination angles. That is, the angle θ2 of the inclination toward the outside of the main body portion 10 is made gentler than the angle θ1 toward the rotating portion 11. Furthermore, the angle of the normal thread is about 60 °, but the angle (θ1 + θ2) of the thread in the asymmetric screw portion 10b is sharpened to about 30 °.
[0013]
A knurled portion 10 a is formed on the outer peripheral surface of the main body portion 10, and this knurled portion 10 a serves as a slip stopper when the main body portion 10 is screwed into the coaxial cable. An extending portion 10c whose diameter is slightly narrowed through a stepped portion 10e is formed on the rotating portion 11 side of the main body portion 10, and this extending portion 10c is inserted into the rotating portion 11 so that the tip of the extending portion 10c is caulked. The crimped portion 10d is formed by processing. Thereby, the rotating part 11 is fixed to the main body part 10 so as to be rotatable. The rotating part 11 has an outer peripheral surface formed in a hexagonal shape, but is formed in a substantially cylindrical shape, and a screw part 11a is formed on the inner peripheral surface thereof. The screw portion 11a is a screw portion that is screwed to the coaxial connector when the coaxial plug 1 is attached to the coaxial connector.
[0014]
Next, the description will be given with reference to FIGS. 5A, 5B, 5C, 5D, and 5E, which show the steps when the coaxial connector 1 according to the present invention is attached to the tip of the coaxial cable 20. FIG. Do. However, FIG. 5A is a diagram showing a first process of processing the coaxial cable 20 to which the coaxial connector 1 is attached, and FIG. 5B is a diagram showing the second process, and FIG. ) Is a diagram showing a first step of attaching the coaxial connector 1 to the tip of the coaxial cable 20, and FIG. 5D is a diagram showing the middle of attaching the coaxial connector 1 to the tip of the coaxial cable 20; FIG. 5E is a view showing the coaxial connector 1 attached to the tip of the coaxial cable 20.
[0015]
When the coaxial connector 1 according to the present invention is attached to the distal end of the coaxial cable 20, the outer sheath 21 at the distal end of the coaxial cable 20 is cut to a predetermined length as shown in FIG. To expose. Next, as shown in FIG. 5B, the braided wire 22 is folded back on the outer cover 21 and cut away leaving a predetermined length to expose the insulator 23 positioned inside the braided wire 22. Then, the insulator 23 is cut by a predetermined length, and the core wire 24 located inside the insulator 23 is exposed by a predetermined length. In this state, as shown in FIG. 5C, the rear end of the main body portion 10 of the coaxial connector 1 is brought into contact with the outer cover 21 on which the braided wire 22 is folded, and the knurled portion 10a of the main body portion 10 is held. Then, it is screwed into the outer cover 21. Then, as shown in FIG. 5 (d), the asymmetric screw portion 10 b formed on the inner peripheral surface of the main body portion 10 is screwed into the outer cover 21 where the braided wire 22 is folded back, so that the coaxial connector 1 The coaxial cable 20 enters into the through hole 1a.
[0016]
Then, as shown in FIG. 5 (e), the main body 10 until the front end of the jacket 21 where the braided wire 2 is folded back comes into contact with the step 10e formed almost at the front end of the main body 10. Screw in. Then, the coaxial plug 1 according to the present invention can be mounted on the coaxial cable 20 by obliquely cutting the tip of the core wire 24 located substantially on the central axis of the rotating portion 11. In this case, the braided wire 22 comes into electrical contact with the main body 10 reliably. Further, since the inclination angle θ2 of the asymmetric screw portion 10b in the main body portion 10 is a loose angle, the torque when screwed into the coaxial cable 20 can be reduced, and the coaxial plug 1 can be easily connected to the coaxial cable 1. 20 can be attached. Furthermore, since the inclination angle θ1 of the asymmetric screw portion 10b in the main body portion 10 is a steep angle, the torque when removing the coaxial plug 1 from the coaxial cable 20 by rotating the main body portion 10 in the reverse direction is increased. In addition, the fixing force between the two can be increased, and the coaxial plug 1 can be prevented from being carelessly detached from the coaxial cable 20.
[0017]
Furthermore, since the thread angle (θ1 + θ2) in the asymmetric screw portion 10b is sharpened to about 30 °, the amount of biting of the asymmetric screw portion 10b into the coaxial cable 20 is increased even if the screwing resistance is reduced. Thus, the fixing force can be improved. Furthermore, as shown in FIG. 4, since the top of the thread of the asymmetrical screw portion 10b is round and smoothly formed, when the main body portion 10 is screwed onto the jacket 21 where the braided wire 2 is folded back. It is possible to prevent the braided wire 22 from being cut by the asymmetric screw portion 10b. Furthermore, since the thread pitch of the asymmetric screw portion 10b is increased as shown in FIG. 4, the amount of progress per rotation can be increased, and the coaxial connector 1 is easily attached to the coaxial cable 20. be able to. If the pitch of the asymmetric threaded portion 10b is large, the tensile strength of the coaxial plug 1 attached to the coaxial cable 20 is lowered. Therefore, the pitch is reduced as the diameter of the coaxial cable to which the coaxial plug 1 is attached becomes thinner. May be. Further, since the main body portion 10 provided with the knurled portion 10a can be rotated by grasping by hand, the coaxial plug 1 can be attached to the coaxial cable 20 without requiring any special tool. become. As described above, the coaxial plug 1 according to the present invention can be removed simply by rotating the main body 10 in the direction opposite to that when the coaxial plug 20 is attached to the coaxial cable 20, so that the coaxial plug 1 can be reused. become.
[0018]
By the way, when the coaxial plug 1 according to the present invention is attached to the coaxial cable 20, it is one of the features that it is not necessary to make the amount of folding back of the braided wire 22 onto the jacket 21 constant. For example, FIGS. 6A, 6B, 6C, and 6D are explanatory diagrams when the coaxial plug 1 is attached to the coaxial cable 20 when the amount of folding of the braided wire 22 is less than that shown in FIG. e). However, FIG. 6A is a diagram showing a first step of processing the coaxial cable 20 to which the coaxial connector 1 is attached, and FIG. 6B is a diagram showing the second step, and FIG. ) Is a diagram showing a first step of attaching the coaxial connector 1 to the tip of the coaxial cable 20, and FIG. 6 (d) is a diagram showing the middle of attaching the coaxial connector 1 to the tip of the coaxial cable 20. FIG. 6 (e) is a view showing the coaxial connector 1 attached to the tip of the coaxial cable 20.
[0019]
In this case, the exposure amount of the braided wire 22 is reduced as shown in FIG. 6 (a), and therefore the amount of folding back onto the jacket 21 is also reduced as shown in FIG. 6 (b). As shown in FIGS. 6 (c) and 6 (d), the coaxial connector 1 is screwed into the coaxial cable 20 in which the amount of folding of the braided wire 22 is reduced in this way. To do. When the coaxial connector 1 is attached to the coaxial cable 20 as shown in FIG. 6 (e), the inner peripheral surface of the main body portion 10 is a braided wire 22 that is folded back on the jacket 21 including the asymmetric screw portion 10b. It comes in contact reliably. Therefore, even if the exposure amount of the braided wire 22 is shortened, the coaxial connector 1 can be attached to the coaxial cable 20 in an electrically stable manner.
[0020]
Furthermore, when the coaxial connector 1 according to the present invention is attached to the coaxial cable 20, it is not necessary to expose the braided wire 22 and fold it back onto the jacket 21. For example, FIGS. 7 (a), (b), (c), (d), and (e) are explanatory views when the coaxial plug 1 is attached to the coaxial cable 20 without performing the processing for exposing the braided wire 22 to the coaxial cable. Show. However, FIG. 7A is a diagram showing a process of processing the coaxial cable 20 to which the coaxial connector 1 is attached, and FIG. 7B is a first process of attaching the coaxial connector 1 to the tip of the coaxial cable 20. FIG. 7C is a diagram showing a state in which the coaxial plug 1 is being attached to the tip of the coaxial cable 20, and FIG. 7D is a diagram of the coaxial connector attached to the tip of the coaxial cable 20. 7 is an enlarged view of a part of the coaxial plug 1 attached to the tip of the coaxial cable 20.
[0021]
In this case, as shown in FIG. 7A, the braided wire 22 is not exposed and only the core wire 24 is exposed. As shown in FIGS. 7 (b) and 7 (c), the coaxial cable 20 is subjected to simple processing in which the braided wire 22 is not exposed and is not folded back on the jacket 21. 1 is screwed into the mounting state of FIG. Even in this case, when the coaxial connector 1 is attached to the coaxial cable 20 as shown in FIGS. 7D and 7E, the stepped portion 10e formed at the distal end portion of the inner peripheral surface of the main body portion 10 is applied. The braided wire 22 comes into contact with certainty. This is because the asymmetrical screw portion 10b is screwed into the outer cover 21 as shown in an enlarged view in FIG. 7 (e), so that the outer cover 21 is slightly retracted and the braided wire 22 is exposed. This is because the braided wire 22 comes into reliable contact with the stepped portion 10e as shown in FIG. Therefore, the coaxial connector 1 can be attached to the coaxial cable 20 in an electrically stable manner without processing to expose the braided wire 22.
[0022]
【The invention's effect】
As described above, according to the present invention, the coaxial plug can be fixed to the coaxial cable by screwing the asymmetric screw portion formed on the inner peripheral surface of the main body portion into the coaxial cable. Therefore, by rotating in the opposite direction to the time when the coaxial connector fixed to the coaxial cable is attached, the coaxial connector can be removed from the coaxial cable, and the coaxial connector can be reused. . In this case, since the inclination toward the outside in the asymmetric screw portion is made gentler than the inclination toward the rotation portion, the torque at the time of attaching the coaxial plug can be reduced and the torque at the time of removal can be increased. As a result, it becomes difficult to reversely rotate, and the fixing force of the coaxial plug to the coaxial cable can be improved, and the coaxial plug can be prevented from being accidentally detached from the coaxial cable.
[0023]
In addition, since the top of the asymmetric screw part has a rounded and smooth shape, it is possible to prevent the braided wire folded on the outer cover of the coaxial cable from being cut when the asymmetric screw part is screwed. it can. Furthermore, since the main body can be rotated by gripping it by hand, the coaxial plug can be attached to the coaxial cable without requiring any special tool. Furthermore, since the coaxial plug can be fixed to the coaxial cable without inserting anything between the braided wire of the coaxial cable and the insulator, the high frequency characteristics are deteriorated even if the coaxial plug is attached to the coaxial cable. Can be prevented.
[Brief description of the drawings]
FIG. 1 is a front perspective view showing a configuration of a coaxial connector according to an embodiment of the present invention.
FIG. 2 is a rear perspective view showing the configuration of the coaxial plug according to the embodiment of the present invention.
FIG. 3 is a half cross-sectional view showing a configuration of a coaxial connector according to an embodiment of the present invention.
FIG. 4 is an enlarged view showing a part of the configuration of the coaxial plug according to the embodiment of the present invention.
FIG. 5 is a diagram showing a process when the coaxial plug according to the embodiment of the present invention is attached to the tip of the coaxial cable.
FIG. 6 is a diagram showing a process when the coaxial plug according to the embodiment of the present invention is attached to the tip of a coaxial cable which has been processed differently.
FIG. 7 is a diagram showing a process when the coaxial plug according to the embodiment of the present invention is attached to the tip of a coaxial cable which is further processed.
FIG. 8 is a diagram showing a process when a conventional coaxial plug is attached to the tip of a coaxial cable.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coaxial plug, 1a Through-hole, 2 Braided wire, 10 Main body part, 10a Knurled part, 10b Asymmetric thread part, 10c Extension part, 10d Caulking part, 10e Step part, 11 Rotation part, 11a Screw part, 20 Coaxial cable, 21 outer sheath, 22 braided wire, 23 insulator, 24 core wire, 100 coaxial plug, 110 body portion, 110a insertion portion, 110b concave portion, 111 rotating portion, 120 coaxial cable, 121 outer sheath, 122 braided wire, 123 insulator 124 core wire, 130 caulking

Claims (3)

A coaxial plug that is attached to the tip of the coaxial cable and has a through-hole formed throughout.
A main body part formed in a cylindrical shape, and an asymmetrical thread part formed on the inner peripheral surface with an inclination toward the outside being looser than an inclination toward the rotating part ,
It is rotatably fixed to the tip of the main body, and includes a rotating part that can be attached to the coaxial connector.
By screwing the asymmetric screw portion in the main body portion into a coaxial cable, the coaxial cable enters the through hole, and the braided wire of the coaxial cable is in electrical contact with the main body portion. A coaxial connector characterized in that a core wire exposed from the tip of a coaxial cable is arranged substantially along the central axis of the rotating part.   2. The coaxial connector according to claim 1, wherein anti-slip means is provided on the outer peripheral surface of the main body. Coaxial connector of claim 1, wherein a top portion of the asymmetric threaded portion is a smooth rounded shape.

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