JPH11312559A - Dummy built-in coaxial plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically close a terminal when the terminal is open, so that no flowing noises are generated. SOLUTION: A switch board 13 is energized by an elastic body 24 and brought into contact with a third step part 40-6. As a result, a central contact 25 is terminated via a central conductor 12 by a dummy resistance provided on the switch board 13. When a third shell 40 is attached to a coaxial connector, a movable insulator 11 is pressed and the switch board 13 moves out of contact with the third step part 40-6, thereby a terminal circuit is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coaxial connector which is attached to the end of a coaxial cable and is used as an input terminal or an output terminal of a device such as a distributor or a series unit for transmitting electric signals in CATV or the like. And a dummy built-in coaxial plug that is automatically terminated when not connected to a coaxial connector.

[0002]

2. Description of the Related Art A coaxial connector used as an input / output terminal of a distributor or a series unit for inputting / outputting a high-frequency signal such as a CATV signal or a television signal is provided at a tip of a coaxial cable for transmitting a signal to a television or the like. By connecting the coaxial plugs, a signal is transmitted to a television or the like via the coaxial connector and the coaxial plug. At this time, if a device such as a television is not installed, if a coaxial plug attached to one end of the coaxial cable is connected to an output terminal of the device such as a distributor or a series unit, the coaxial cable is The output-side coaxial plug attached to the other end is opened, and becomes a so-called empty terminal. Since the center contact of the coaxial plug which has been made an empty terminal is released, there is a possibility that ambient noise may jump in. However, in the case of TV retransmission, which is often performed in a co-listening system such as home co-listening or radio interference, there are almost no signals transmitted using adjacent channels. The occurrence of obstacles to the televisions deployed in Japan has not been a serious problem.

However, in the case of CATV systems such as multi-channel transmission and bidirectional CATV, which have recently been introduced, the number of channels to be used is large, so that signals are also transmitted to adjacent channels and free terminals are used. If it is left as it is, there is a problem that a failure or the like may occur in a television or the like provided elsewhere due to impedance mismatch or jumping noise.

For example, when a coaxial cable having a free coaxial plug at the end is connected to one terminal A of a two-way distributor, the VSWR (voltage standing wave ratio) in the output direction of the terminal A is infinite. Since the signal becomes large, a phase shift occurs in the signal due to the reflected wave from the terminal A, and the signal deteriorates.
Then, a ghost occurs in a television or the like connected to the other terminal B. Furthermore, amplitude fluctuations also occur due to the phase shift, which deteriorates the frequency characteristics.
Some channels will cause failures. Also, at the time of BS / CS-IF transmission, the satellite broadcast signal is FM
Since the modulation is performed, truncation noise is generated, and energy diffusion removal failure occurs. Note that since CATV is also FM-modulated, a similar failure may occur.

Further, when a coaxial cable having a free coaxial plug at the end is connected to one terminal A of a two-way distributor of a bidirectional CATV system, the center contact is exposed. External noise gets on the center contact, and the noise on the vacant terminals of many terminals accumulates and goes up to the center. This is called ingress noise. In addition, the noise does not only ride on the center contact, but also on the coaxial cable itself. When noise from a large number of coaxial cables is combined, ingress noise similarly occurs, and the In this case, there is a possibility that the upstream line cannot be used due to the ingress noise.

[0006]

Conventionally, a dummy plug having a built-in dummy resistor is mounted on an empty terminal of a coaxial connector so that such a failure does not occur. Such a dummy plug is a real 6-1736
No. 3 publication. However, when a coaxial plug is connected to the coaxial connector, and the other end of the coaxial cable to which the coaxial plug is attached is an empty terminal, the dummy plug cannot be connected to the coaxial plug. However, it cannot be terminated with a dummy plug. Even if there is a dummy connector having a built-in dummy resistor that can be connected to the coaxial plug, attaching such a dummy connector to an empty terminal is not always performed by a user. In particular, in ordinary households, it is not customary to attach a dummy connector to a vacant terminal because it is not customary to recognize the necessity of terminating even if there is a vacant terminal as a conventional practice.

[0007] Therefore, the present invention provides a method in which a failure is caused by a built-in terminating resistor even if a coaxial plug attached to a coaxial cable connected to an output terminal of a device such as a distributor or a series unit is left unoccupied. It is an object of the present invention to provide a dummy built-in coaxial plug which is prevented from being generated.

[0008]

In order to achieve the above object, a dummy built-in coaxial plug according to the present invention has a substantially cylindrical conductive first shell and a rotatable front portion of the first shell. An electrically conductive third shell having a substantially cylindrical shape,
A conductive second shell attached to a rear portion of the first shell, a movable insulator disposed to close a front surface of the first shell, and slidable in the first shell;
A conductive center contact disposed inside the first shell along a substantially central axis thereof; and a holding piece for holding the center contact. The holding member is disposed inside the first shell substantially along a central axis thereof. A conductive center conductor, an insulative lid body fixed to the center conductor so as to close the rear end of the first shell, and a contact pattern are formed on one surface, and are formed on the other surface. A printed pattern to which a dummy resistor is connected is formed, the contact pattern is formed by a printed circuit board connected to the printed pattern by a through hole, and the center conductor is inserted into a through hole formed substantially in the center. And the first pattern in which the second pattern that is in contact with the center conductor is formed in the through hole.
A switch board disposed in the shell, and the contact pattern formed on the switch board biases the switch board so as to contact a step formed inside the first shell; An insulating elastic body composed of a first tubular body and a second tubular body connected to form a double sleeve, wherein the elasticity is provided when no coaxial connector is attached to the third shell. When the switch board is urged by the body, the step portion of the first shell comes into contact with the contact pattern, and the center contact is provided on the switch board via the center conductor. And when the coaxial connector is attached to the first shell, the movable insulator is pushed inward by the front surface of the coaxial connector and moves inward, whereby the Switch substrate slides, the first
The contact between the step portion of the shell and the contact pattern is released.

In the dummy built-in coaxial plug, the second shell has an insertion portion inserted between a shielding braided wire of the coaxial cable and an insulating portion when the coaxial cable is attached. A core insertion portion into which the core of the coaxial cable is inserted may be formed at the rear of the center contact. Further, in the dummy built-in coaxial plug, a closing member made of a flexible material for closing a front surface of the first shell is provided on a front surface of the movable insulator, and a coaxial connector is mounted on the first shell. If not, the front surface of the first shell may be completely closed by the closing body. Furthermore, in the dummy built-in coaxial plug, the elastic body may be made of silicon rubber.

Further, in the dummy built-in coaxial plug, the elastic body is disposed between the switch substrate and the lid, and is connected to the first cylindrical body in a double sleeve shape. A rear half portion of one of the cylindrical body portion and the second cylindrical body portion located on the lid body side may be removed. Further, in the dummy built-in coaxial plug, a screw portion screwed to a coaxial connector may be formed on an inner peripheral surface of the third shell. Furthermore, in the dummy built-in coaxial plug, the first shell is extended in place of the third shell, and when the extended portion is inserted into the coaxial connector, the outer peripheral surface of the coaxial connector is pressed. A plurality of springs may be provided on the inner peripheral portion. Furthermore, in the dummy built-in coaxial plug, the center contact may be configured by extending a core wire of a coaxial cable.

According to the present invention, when the dummy built-in coaxial plug is an unoccupied terminal, the center contact is made via the dummy resistor provided on the printed circuit board by the urging force of the insulating elastic body. You will be connected to the shell. Therefore, the center contact is terminated by a dummy resistor so that impedance matching is achieved, and the elastic body is made of an insulating material instead of a metal coil spring. The VSWR of the built-in dummy coaxial plug can be automatically terminated when it becomes a vacant terminal.
Is a small value. In addition, since noise and the like jumping into the center contact are terminated by the dummy resistor,
It is possible to prevent the occurrence of ingress noise without going to the center, and to prevent a reception failure from giving to other receiving devices.

Furthermore, when the dummy built-in coaxial plug is mounted on a coaxial connector provided in the receiving device, the switch substrate moves against the urging force of the insulating elastic body, so that the center contact and the first shell are moved. Is turned off. As a result, the circuit for terminating the center contact with the dummy resistor is opened. Thus, the signal can be efficiently transmitted to the receiving device via the center contact of the dummy built-in coaxial plug. In addition, since the front surface of the first shell of the coaxial plug with a built-in dummy is closed by the flexible closing body, it is possible to prevent dust from entering the inside when the terminal is used as an empty terminal.

Further, the elastic body is disposed between the switch substrate and the lid, and is formed of any one of the first cylindrical body and the second cylindrical body connected to form a double sleeve. The rear half of one of the cylindrical portions located on the lid side may be removed. In this way, by removing the rear half portion located on one of the lid sides of the cylindrical body constituting the elastic body so as to form a double sleeve, the first cylindrical body and the first cylindrical body when pressed are removed. The connecting portion connecting the two cylindrical portions and the cylindrical portion that is not formed as a double sleeve are locally deformed, and can stably move while maintaining the parallel state of the switch substrate. Become like

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1, 2 and 3 show examples of the construction of a first embodiment of a coaxial plug with a built-in dummy according to the present invention. However, FIG. 1 is an exploded perspective view showing the configuration of an embodiment of a dummy built-in coaxial plug of the present invention, FIG. 2 is a sectional view of the dummy built-in coaxial plug after assembly, and FIG. FIG. As shown in the figure, the dummy built-in coaxial plug 1 is attached to the end of a coaxial cable through which electric signals, particularly high-frequency signals, are transmitted.
When attached to a coaxial cable, it is attached to a coaxial connector provided in a series unit or a receiving device.

A coaxial plug 1 with a built-in dummy according to a first embodiment of the present invention comprises a plug portion 2 attached to a coaxial connector and an attachment portion 3 to which a coaxial cable is attached. The plug portion 2 includes a first shell 30 made of metal,
The mounting portion 3 is constituted by the second shell 20. The third shell 40 is rotatably fixed to the first shell 30 when fixed.
In the first shell 30, as shown in FIG.
1, a center conductor 12, a switch board 13, and an elastic body 2.
4 and a lid 15 are incorporated. And the second shell 2
No. 0 is configured so that the coaxial cable 5 with the exposed core 5-1 can be attached to the rear part. Although not shown in FIG. 1, a center contact 25 is fitted to the end of the core wire 5-1 of the coaxial cable 5, and the center contact 25 is connected to the lid 15, the switch board 13, the center conductor 12, The third shell 40 extends through the insulator 11 and substantially along the central axis.

The details of the configuration of each part will be described later, and the assembling sequence of the dummy built-in coaxial plug 1 of the present invention will be described with reference to FIG. First, the switch board 13 is inserted into the center conductor 12, and then the elastic body 24 is inserted into the center conductor 12. Next, in this state, the center conductor 1 is attached to the lid 15.
Press down the bottom of 2 to assemble the center conductor assembly.
At the same time, the rear end of the third shell 40 is rotatably fixed to the second holding portion 30-2 of the first shell 30 by caulking. Then, from the front side of the third shell 40, the movable insulator 1
Then, the center conductor assembly assembled from the rear side of the first shell 30 is inserted and fixed. Furthermore, the first
The second shell 20 is fixed to the rear side of the shell. Thereby, the dummy built-in coaxial plug 1 can be assembled.

When attaching the coaxial cable 5 to the dummy built-in coaxial plug 1, the coaxial cable 5 is processed as shown in FIG. That is, the core wire 5-1 is exposed for a predetermined length, and the shielding knitting wire 5-3 is folded back on the jacket 5-4. Next, the center contact 25 is attached by inserting the core wire 5-1 into a core wire insertion portion provided at the rear part of the center contact 25, and the second shell 20
The coaxial cable 5 is pushed into the second shell 20 so that the insertion portion 20-2 extended from the rear surface of the coaxial cable 5 is press-fitted between the insulating portion 5-2 of the coaxial cable 5 and the knitting wire 5-3 for shielding. Go out. Thereby, the shielding knitting wire 5-3 is connected to the second shell 20, and the center contact 2
5 passes through the second shell 20, the lid 15, the switch board 13, the center conductor 12, and the movable insulator 11 to form a third shell 40.
Are arranged along the substantially central axis of the.

Hereinafter, the detailed configuration of the dummy built-in coaxial plug 1 will be described with reference to FIGS. 1, 2, and 3. The dummy built-in coaxial plug 1 is rotatable around a cylindrical first metal shell 30, a second shell 20 fixed to a rear portion of the first shell 30, and a front portion of the first shell 30. A third shell 40 fixed to the second shell 20.
Is configured to have a coaxial cable 5 attached thereto.
An outer shell of the shell 40 is a hexagonal portion 40-7, and a screw portion 40-2 is formed on an inner peripheral surface thereof. The movable insulator 11 is fixed to the front surface of the first shell 30 so as to be able to come and go. A closing body 16 made of a flexible elastic body is integrally fitted and fixed to the front surface of the movable insulator 11.

The movable insulator 11 is made of a resin such as polycarbonate, and its detailed configuration is shown in FIG.
(B) As shown in (c), when the movable insulator 11 is fixed to the first shell 30 so as to be able to come and go, the front surface of the dummy built-in coaxial plug 1 is closed by the closing body 16. In addition, dust is prevented from entering the inside of the first shell 30. Further, when the movable insulator 11 is inserted from the front side of the first shell 30, as shown in FIG. 5B, the engagement formed at the tip of the extension portion 11-2 extended from the rear portion. The portion 11-3 is engaged with the ring-shaped second step portion 40-5 formed on the upper surface of the ring-shaped protrusion 40-3 formed on the inner peripheral surface of the first shell 30. Thereby, when the movable insulator 11 is inserted into the first shell 30, the movable insulator 11 is locked so as not to fall out of the first shell 30 and can slide with respect to the first shell 30. It will be arranged in.

The extending portion 11-2 is provided with a slot 11-4.
As a result, the stretched portion 11-2 has elasticity. For this reason, the engagement portion 11-3 elastically engages with the ring-shaped second step portion 40-5. The rear surface of the movable insulator 11 on which the extending portion 11-2 is formed abuts the first step portion 40-4 which is the front surface of the protruding portion 40-3 formed in the first shell 30. Then, the movement of the movable insulator 11 is stopped. As described above, the sliding range of the movable insulator 11 is restricted, so that the movable insulator 11 is prevented from being pushed too much and the dummy built-in coaxial plug 1 is damaged.

On the front surface of the movable insulator 11, a closing body 16 made of a flexible elastic material such as an elastomer is integrally formed. This closing body 16 is shown in FIGS.
As shown in FIG. 3, three projections 16-1 project from the back side. When the closing body 16 is integrally formed on the front surface of the movable insulator 11, the protrusion 16-1 is formed so as to be in close contact with a concave portion formed on the front surface of the moving insulator 11, so that the closing body 16 is formed. 16 and the movable insulator 11 are integrated. A guide 16-2 formed of a tapered recess and a ring-shaped protrusion 16-3 formed in a ring shape are formed at substantially the center of the front surface of the closing body 16.
The guide part 16-2 has a core 5-1 of the coaxial cable 5 attached thereto.
Is inserted through the conductive center contact 25 fitted at the tip of the. The ring-shaped projection 16-3 is a portion to which the distal end face of the coaxial connector comes into contact when attached to a coaxial connector (not shown), and acts to reduce the impact.

Returning to FIGS. 1, 2 and 3, the first shell 30
A switch substrate 13 made of a printed circuit board is housed substantially at the center of the inside. One surface of the switch board 13 abuts on a third step portion 40-6 on the rear surface of the protruding portion 40-3 which is normally formed to protrude from the inner peripheral surface of the first shell 30 as shown in FIG. Is done. This switch board 13
6 (a) and 6 (b), a through hole 13-1 is formed substantially at the center of the switch substrate 13. FIG. FIG. 6A shows the configuration of one surface of the switch substrate 13, and FIG. 6B shows the configuration of the other surface of the switch substrate 13. As shown in the drawing, a first pattern 13-2 and a second pattern 13-3 are formed on one surface of the switch substrate 13, and when the switch substrate 13 comes into contact with the third step portion 40-6. Then, the first pattern 13-2 comes into contact with the third step portion 40-6.

It should be noted that the second pattern 13-3 is
-1. Also, the switch board 13
On the other side, as shown in FIG.
Fifth, fourth pattern 13-6, and fifth pattern 13-7 are formed. The third pattern 13-5 has a through hole 13-.
1 and is connected to a second pattern 13-3 formed on one surface by a through hole formed in the through hole 13-1. Further, the fourth pattern 13-6 is connected to the first pattern 13-2 formed on one surface by a through hole 13-4. Then, a dummy resistor 17-1 is soldered between the fourth pattern 13-6 and the fifth pattern 13-7, and the fifth pattern 13-
7 and the third pattern 13-5, a capacitor 17-
2 is soldered. Note that these patterns have a necessary minimum length so as not to generate a stray capacitance with the first shell 30.

The center conductor 12 is inserted into the through hole 13-1 of the switch board 13, and the contact piece formed on the center conductor 12 is brought into contact with the through hole formed in the through hole 13-1. On the other hand, since the center contact 25 held between the center conductors 12 is supported by the holding pieces of the center conductor 12, the center contacts 25 are formed in the through-holes formed in the center conductor 12 and the through holes 13-1. It becomes electrically connected. Therefore, in the state shown in FIG.
Pattern 13-5-Capacitor 17-2-Fifth pattern 13-7-Dummy resistor 17-1-Fourth pattern 13-6
-It is electrically connected to the first shell 30 via the through hole 13-4-first pattern 13-2. First shell 3
0 is connected to the shielding knitting wire 5-3 of the coaxial cable 5 attached to the second shell 20, so that in the state shown in FIG.
5 is grounded via the dummy resistors 17-1 and 17-1.

As a result, the coaxial plug 1 with a built-in termination is terminated and impedance-matched, so that occurrence of flow noise and the like can be prevented. The center conductor 12 is formed by bending a metal plate such as brass or phosphor bronze and plating it with gold.
The lower end of the lid 1 is made of resin such as polycarbonate.
As shown in FIG. 2, the first shell 30 is disposed substantially at the center of the first shell 30 by being press-fitted into the inside 5. The lid 15 is inserted from the rear surface of the first shell 30 so that the first shell 30
Of the second shell 20 to the first holding portion 30-1.
By caulking -1, the lid 15 is fixed in the first shell 30 and the second shell 20 is fixed so as to be electrically connected to the first shell 30 reliably.

FIG. 7A shows the detailed structure of the lid 15.
(B). FIG. 7A is a plan view showing the lid 15 in a half sectional view, and FIG. 7B is a right side view. As shown in these figures, the lid 15 includes a lid 15-4 for closing the rear surface of the first shell 30 and a cylindrical portion 15-1 formed to protrude from the center of the lid 15. Have been. The lid 15 and the center conductor 12 are fixed by press-fitting the lower end of the center conductor 12 into the center conductor press-fitting hole 15-8 formed in the cylindrical portion 15-1. Further, the first ring portion 15-2 and the second ring portion 1 are provided on the lid portion 15-4.
5-3 are formed so as to be doubled.
The first ring 15-2 and the second ring portion 15-3
A recess 15-6 and a second recess 15-7 are formed therebetween.

As shown in FIG. 2, the rear edge of the elastic body 24 is accommodated in the first recess 15-6. This elastic body 24
Is made of, for example, silicon rubber, and presses the rear surface of the switch substrate 13 against the lid 15 to thereby form the first pattern 13-2 of the switch substrate 13 into the first shell 3.
0 is in contact with a third step portion 40-6 formed on the inner peripheral surface. 8 (a) and 8 (b) show a detailed configuration of the elastic body 24. The first half of the elastic body 24 has a first cylindrical body 24-1 and a second cylindrical body 24-1 so that the switch board 13 can be easily moved in parallel. A double sleeve is formed with the cylindrical body 24-2, and the rear half thereof is formed of a single sleeve including only the second cylindrical body 24-2. In addition, the first cylindrical portion 24-1 and the second cylindrical portion 2
4-2 is connected by a connecting portion 24-3 formed substantially at the center.

Further, the outer peripheral surface at the front edge and substantially the center of the first cylindrical body 24-1 is thickened,
3 is easily translated. Further, the outer peripheral portion of the front edge has a corner cut. This is for the following reason. When the coaxial connector is attached to the dummy built-in coaxial plug 1 of the present invention, the coaxial connector is
When closed, the closing body 16 mounted on the movable insulator 11 is pressed by the front surface of the coaxial connector,
The movable insulator 11 is pushed inside. Thereby, the switch board 13 with which the tip of the extension portion 11-2 of the movable insulator 11 is in contact is moved rightward in FIG.

As a result, the elastic body 24 is compressed against its elastic force, and at this time, the first cylindrical body 24
8A is cut as shown in FIG. 8A, the first cylindrical portion 24-1 is located between the outer peripheral edge of the switch board 13 and the inner peripheral surface of the first shell 30. The first cylindrical portion 24-1 is deformed and compressed in a direction in which the front edge of the first cylindrical portion is not pinched. In this case, in the deformable portion of the elastic body 24, the connecting portion 24-3 and the rear half of the second cylindrical body 24-2 are locally deformed. For this reason, the deformation of the first half of the double sleeve structure is reduced, and the switch board 13 can be moved while maintaining the parallel state.

When the dummy built-in coaxial plug 1 is attached to the coaxial connector, the movable insulator 11 is pressed by the front surface of the coaxial connector as described above, and the tip of the extension 11-2 of the movable insulator 11 is moved. The contacted switch board 13 is moved rightward in FIG. This allows
The connection between the first pattern 13-2 formed on the switch substrate 13 and the third step portion 40-6 formed on the first shell 30 is disconnected, and the dummy resistor 17- of the center contact 25 is disconnected.
1, the termination by the capacitor 17-2 is released. Therefore, when the coaxial plug 1 with a built-in termination according to the present invention is attached to a coaxial connector provided in a receiving device or the like, impedance mismatch does not occur and a signal is transmitted to the receiving device without attenuation. become.

The end of the second cylindrical body 24-2 on the switch substrate 13 side is bent away from the first cylindrical body 24-1 so that the posture of the switch substrate 13 can be stably maintained. I have to. Furthermore, with this configuration,
Components such as a dummy resistor and a capacitor soldered to the surface of the switch substrate 13 that comes into contact with the elastic body 14 are disposed between the first cylindrical body 24-1 and the second cylindrical body 24-2. Will be able to do it. Furthermore, the second cylindrical body portion 24-
The corner of the front edge of No. 2 is cut as shown. This is because, when the elastic body 24 is compressed by the switch board 13, the front edge of the second tubular body 24-2 is moved in the second direction so as not to be sandwiched by the through hole 13-1 formed in the switch board 13. This is because the cylindrical body 24-2 is deformed and compressed.

As described above, the elastic body 24 has a double-sleeve shape in the front half and a single-sleeve shape in the rear half, so that when the elastic body 24 is compressed, the latter half is formed into a single sleeve. The part is mainly deformed and compressed, and the deformation of the first half can be suppressed as much as possible. Therefore, the switch board 13 can be stably moved, and the switch board 13 can be stably brought into contact with the third step portion 10-6. The elastic body 24
Since the friction coefficient of the movable insulator 21 is reduced even if the latter half of the sleeve is formed as a single sleeve,
Can be moved. Further, in the example shown in FIG. 8, the rear half of the first cylindrical body 24-1 is cut off, but instead the rear half of the second cylindrical body 24-2 may be cut off. .

The total length of the elastic body 24 is the first shell 3
When the dummy built-in coaxial plug 1 is in an empty terminal state, it is formed to have a length that is slightly compressed when the dummy built-in coaxial plug 1 is set in the first shell 30 in a compressed state. The switch board 13 can be reliably urged, and can be reliably brought into contact with the third step portion 40-6.

Next, the detailed configuration of the center conductor 12 is shown in FIG.
(A), (b), (c) and (d) are shown. 9A is a top view of the center conductor 12, FIG. 9B is a front view thereof, and FIG.
Is a left side view thereof, and FIG. 4D is a right side view thereof. As shown in these figures, the center conductor 12 is brought into contact with a pair of holding pieces 12-3 holding the center contact 25 and a through hole formed on the inner surface of the through hole 13-1 of the switch board 13. A pair of contact pieces 12-4 are formed.
Further, the pair of holding pieces 12-3 and the pair of contact pieces 12-4 are bent so as to have a mountain-shaped cross section so as to maintain predetermined elasticity. Accordingly, the cross-sectional shape of the base 12-1 on which the pair of holding pieces 12-3 and the pair of contact pieces 12-4 are formed is substantially hexagonal as shown in FIG. 9D. . The base portion 12-1 is a portion that is press-fitted into a through hole 15-5 formed in the lid 15.

Next, the second shell 20 constitutes the mounting portion 3 of the coaxial cable 5, and the manner in which the coaxial cable 5 is mounted on the mounting portion 3 formed of the second shell 20 will be described. As shown in FIG. 2, a cylindrical insertion portion 20-2 is formed to extend from the rear surface of the second shell 20.
A step is formed at the tip of the insertion portion 20-2, and the tip is tapered. Therefore, this insertion portion 20
-2, the insulating portion 5-2 and the shielding knitting wire 5-3 of the coaxial cable 5 whose tapered portion at the tip is processed as shown in FIG.
Insert between. In this case, since the distal end portion is tapered, the insertion operation can be easily performed. This insertion operation is performed until the front surface of the coaxial cable 5 contacts the rear surface of the second shell 20.

At this time, a thin rod-shaped center contact 25 is fitted to the end of the core wire 5-1 of the coaxial cable 5, and when the insertion operation is performed, this center contact 25 is attached to the cover 1
5 through the through-hole 15-5 of the switch substrate 13.
Of the closing body 16 which is inserted into the pair of holding pieces 12-3 of the center conductor 12 and is held therebetween, and is further integrated with the movable insulator 11. The third shell 40 penetrates the guide portion 16-2 and is disposed substantially on the central axis. Also, the shielding knitting wire 5-3 comes into contact with the rear surface of the second shell 20 and the ring portion 20-3 slightly protruding from the rear surface.
When the insertion operation is completed, the ring-shaped coaxial cable caulking ring 4 previously inserted into the coaxial cable 5 is inserted between the rear surface of the second shell 20 and the step formed in the insertion portion 20-2. Position it and swage it.

Thus, the coaxial cable caulking 4
Is reduced so that the coaxial cable 5 is strongly pressed against the insertion portion 20-2. Therefore, the coaxial cable 5 can be securely attached to the second shell 20. In addition, since the coaxial cable caulking 4 is engaged with the step formed at the tip of the insertion portion 20-2, the coaxial cable 5 comes out of the second shell 20 even when a tensile force is applied to the coaxial cable 5. Is prevented. Also, the coaxial cable caulking 4 is caulked,
The shield knitting wire 5-3 comes into electrical contact with the second shell 20 without fail.

When the dummy built-in coaxial plug 1 according to the first embodiment of the present invention is opened without being mounted on the coaxial connector, the built-in switch board 13 is moved to the first position. By contacting the third step portion 40-6 formed inside the shell 30, a termination circuit is formed, and the center contact 25 is terminated by this termination circuit. As a result, the dummy built-in coaxial plug 1 is placed in the impedance matching state, so that it is possible to prevent the occurrence of the flow noise due to the noise component induced at the center contact 25 and the like. Further, when the dummy built-in coaxial plug 1 is mounted on the coaxial connector, the switch substrate 13 is moved by the movable insulator 11 and the terminal circuit is opened, so that the signal is guided to the receiving device without attenuation. I will be able to be.

Next, FIG. 10 shows a configuration example of a second embodiment of the coaxial plug with a built-in dummy according to the present invention. FIG. 10 shows the second
It is sectional drawing which shows the detailed structure of the coaxial plug with a built-in dummy in embodiment. The dummy built-in plug 100 of the second embodiment has almost the same configuration as the dummy built-in coaxial plug 1 of the first embodiment except for a part of the configuration. It shall be explained. The configuration of this dummy built-in coaxial plug 100 differs from that of the dummy built-in coaxial plug 1 of the first embodiment in that, first, the center contact is configured by the core wire 5-1 of the coaxial cable. Second, the configuration of the elastic body 14 is changed.

Therefore, a configuration of the dummy built-in coaxial plug 100 according to the second embodiment that is different from the dummy built-in plug 1 according to the first embodiment will be described with reference to FIG. As shown in FIG. 10, the core 5-1 of the coaxial cable 5
Is extended to a position substantially on the central axis of the third shell 40. Thus, the core wire 5-1 of the coaxial cable 5 can also serve as the center contact. At this time, the coaxial cable 5 is processed in advance as shown in FIG. That is, the core wire 5 of the coaxial cable 5
1 is exposed by such a length as to reach the inside of the third shell 40, and the shielding knitting wire 5-3 is folded back on the jacket 5-4.

Then, the tapered portion at the distal end of the insertion portion 20-2 extending from the rear surface of the second shell 20 is processed as shown in FIG. Insert between 5-3. in this case,
Since the tip is tapered, the insertion operation can be easily performed. This insertion operation is performed until the front surface of the coaxial cable 5 contacts the rear surface of the second shell 20. At this time, the core 5-1 of the coaxial cable 5 is
Is inserted through the through hole 15-5 of the switch substrate 13, and penetrates through the pair of holding pieces 12-3 of the center conductor 12, so that the center conductor 12 is pinched.
Furthermore, the closing body 16 integrated with the movable insulator 11
Through the guide portion 16-2 of the third shell 40.

Further, the shield knitting wire 5-3 comes into contact with the rear surface of the second shell 20 and the ring portion 20-3 slightly protruding from the rear surface. When the insertion operation is completed, the ring-shaped coaxial cable caulking ring 4 previously inserted into the coaxial cable 5 is inserted between the rear surface of the second shell 20 and the step formed in the insertion portion 20-2. Position it and swage it. This allows
The diameter of the coaxial cable caulking 4 is reduced, and the coaxial cable 5 is securely attached to the second shell 20. In addition, since the coaxial cable caulking 4 is engaged with the step formed at the tip of the insertion portion 20-2, the coaxial cable 5 comes out of the second shell 20 even when a tensile force is applied to the coaxial cable 5. Is prevented. The caulking of the coaxial cable caulking 4 ensures that the shielding knitting wire 5-3 comes into electrical contact with the second shell 20 without fail.

Next, the structure of the elastic body 14 which is sandwiched between the lid 15 fixed to the rear end of the first shell 30 and the rear surface of the switch substrate 13 and biases the switch substrate is shown in FIG. And the configuration of the elastic body 14 will be described with reference to FIG. The elastic body 14 is made of, for example, silicon rubber, and is interposed between the rear surface of the switch board 13 and the lid 15 as shown in FIG. The shell 30 is pressed so as to come into contact with a third step portion 40-6 formed on the inner peripheral surface of the shell 30. The elastic body 24 facilitates the parallel movement of the switch substrate 13 and the first cylindrical body 14 in order to improve the restoring force.
-1 and a second sleeve portion 14-2. Then, the first cylindrical portion 14-1 and the second cylindrical portion 14
-2 is connected by a connecting portion 14-3 formed substantially at the center.

Further, the outer peripheral surface of the front edge, the approximate center, and the rear edge of the first cylindrical body portion 14-1 is thickened, so that the switch board 13 can be easily moved in parallel. In addition, the outer peripheral portions of the leading edge and the trailing edge are cut off at corners. This is for the following reason. When the coaxial connector is attached to the dummy built-in coaxial plug 1 of the present invention, the movable insulator 11 is pressed by the front surface of the coaxial connector, and the extended portion 1 of the movable insulator 11 is pressed.
The switch board 13 to which the tip of 1-2 is contacted is moved rightward in FIG. Thereby, the elastic body 14 is compressed against its elastic force. At this time,
When the corner of the front edge of the first cylindrical body portion 14-1 is cut as shown in FIG. 11A, the first edge between the outer peripheral edge of the switch board 13 and the inner peripheral surface of the first shell 30 is formed. The first cylindrical portion 14-1 is bent and compressed in a direction in which the front edge of the cylindrical portion 14-1 is not pinched.

The end of the second cylindrical body 14-2 on the switch substrate 13 side is bent away from the first cylindrical body 14-1 so that the posture of the switch substrate 13 can be stably maintained. I have to. Furthermore, with this configuration,
Parts, such as a dummy resistor and a capacitor, which are soldered to the surface of the switch substrate 13 that comes into contact with the elastic body 14, are provided between the first cylindrical body part 14-1 and the second cylindrical body part 14-2. Will be able to do it. Furthermore, the second cylindrical portion 14-
The corner of the front edge of No. 2 is cut as shown. This is because when the elastic body 14 is compressed by the switch board 13, the front edge of the second cylindrical body part 14-2 is moved in the direction in which the front edge of the This is because the cylindrical portion 14-2 is bent and compressed.

The entire length of the elastic body 14 is equal to that of the first shell 3.
When the dummy built-in coaxial plug 1 is in an empty terminal state, it is formed to have a length that is slightly compressed when the dummy built-in coaxial plug 1 is set in the first shell 30 in a compressed state. The switch board 13 can be biased, and can be reliably brought into contact with the third step portion 40-6.

The other configuration of the coaxial plug 100 with a built-in dummy according to the second embodiment of the present invention is substantially the same as that of the coaxial plug 1 with a built-in dummy according to the first embodiment of the present invention, and will not be described. The second aspect of the present invention thus configured
The dummy built-in coaxial plug 100 according to the embodiment
When it is opened without being attached to the coaxial connector,
When the built-in switch board 13 comes into contact with the third step portion 40-6 formed inside the first shell 30, a termination circuit is formed, and the core wire 5-1 acting as the center contact is formed by the termination circuit. To be terminated. As a result, the dummy built-in coaxial plug 100 is brought into the impedance matching state, so that the core wire 5-1 is formed.
Thus, it is possible to prevent the occurrence of the flow signal noise due to the noise component induced by the noise component.

FIG. 12 shows a state where the dummy built-in coaxial plug 100 according to the second embodiment of the present invention is mounted on the coaxial connector 300. Coaxial connector 300
The dummy built-in coaxial plug 100 is mounted on the coaxial connector 300 by screwing a screw portion 40-2 formed on the inner peripheral surface of the third shell 4 to a screw portion 301 formed on the outer peripheral surface of the coaxial connector 300. Will be At this time, since the third shell 40 is rotatable with respect to the first shell 30, the coaxial plug 100 with a built-in dummy can be easily attached to the coaxial connector 300. With this mounting, the movable insulator 11 is pushed by the front surface of the coaxial connector 300, and the movable insulator 11 moves into the first shell 30. Then, the switch substrate 13 is moved away from the third step portion 40-6 by the movable insulator 11, and the terminal circuit is opened. Then, the signal transmitted via the coaxial cable 5 is transmitted via the core wire 5-1 to the coaxial connector 300 provided in the receiving device or the like.

Next, FIGS. 13 and 14 show a configuration example of a third embodiment of the dummy built-in coaxial plug of the present invention.
However, FIG. 13 is a cross-sectional view showing the detailed configuration of the dummy built-in coaxial plug in the third embodiment, and FIG. 14 is a left side view thereof. The dummy built-in coaxial plug 200 according to the third embodiment of the present invention is designed so that it can be attached to a coaxial connector only by inserting and not by screwing. For this reason, the coaxial plug 200 with a built-in dummy according to the third embodiment is formed by integrating the third shell and the first shell of the coaxial plug 100 with a built-in dummy according to the second embodiment into a first shell. Therefore, the configuration will be described with reference to FIGS. 13 and 14. The tip of the first shell 10 is extended, and a plurality of plate-shaped springs 17 are fixed to the inner peripheral surface at substantially equal intervals. I have. The number of the springs 17 is six in the example shown in FIG. When the spring 17 is attached to the coaxial connector, the spring 17 is pressed against the outer peripheral portion of the coaxial connector.
0 can be securely attached to the coaxial connector.

The other configuration of the coaxial plug 200 with a built-in dummy according to the third embodiment of the present invention is substantially the same as that of the coaxial plug 100 with a built-in dummy according to the second embodiment of the present invention, and will not be described. The thus configured dummy built-in coaxial plug 200 according to the third embodiment of the present invention
However, when the coaxial connector is not attached to the coaxial connector but is in an open state, the built-in switch board 13 contacts the third step portion 10-6 formed inside the first shell 10 to form a termination circuit. Then, the core wire 5-1 acting as the center contact is terminated by this termination circuit. As a result, the dummy built-in coaxial plug 200 is placed in the impedance matching state,
It is possible to prevent the generation of a signal noise due to the noise component induced to 1 or the like.

When the extending portion of the first shell 10 of the dummy built-in coaxial plug 200 according to the third embodiment of the present invention is inserted and mounted on the coaxial connector, the movable insulator 11 is connected to the coaxial connector 300. The movable insulator 11 moves into the first shell 30 by being pushed by the front surface of the first shell 30. Then, the switch substrate 13 is moved away from the third step portion 10-6 by the movable insulator 11, and the terminal circuit is opened. Then, the signal transmitted via the coaxial cable 5 is transmitted via a core wire 5-1 to a coaxial connector provided in a receiving device or the like.

In the above description, in the dummy built-in coaxial plug according to the first embodiment, the center contact 25 is fitted to the core 5-1 of the coaxial cable 5, but the present invention is not limited to this. The fifth core wire 5-1 may be extended and used as a center contact. In the coaxial plug with a built-in dummy according to the second and third embodiments, the core wire 5-1 of the coaxial cable 5 is extended to be used as a center contact. The contact 25 may be configured to be fitted to the core wire 5-1 of the coaxial cable 5. Further, as the elastic body used for the dummy built-in coaxial plug in the first to third embodiments, any of the elastic body shown in FIG. 8 and the elastic body shown in FIG. 11 may be used. good.

[0053]

Since the present invention is constructed as described above, when the dummy built-in coaxial plug is a free terminal, the dummy contact whose center contact is provided on the printed circuit board by the urging force of the insulating elastic body. The first shell is connected via the resistor. Therefore, the center contact is terminated by a dummy resistor so that impedance matching is achieved, and the elastic body is made of an insulating material instead of a metal coil spring. The VSWR of the coaxial plug with a built-in dummy has a small value even when the terminal can be automatically terminated when the terminal is vacant. In addition, since noise and the like jumping into the center contact are terminated by the dummy resistor, the noise does not go to the center, so that the occurrence of ingress noise can be prevented, and other receivers may not receive the signal. Giving can be prevented.

Further, when the dummy built-in coaxial plug is mounted on the coaxial connector provided in the receiving device, the switch substrate moves against the urging force of the insulating elastic body, so that the center contact and the first shell are connected. Is turned off. As a result, the circuit for terminating the center contact with the dummy resistor is opened. Thus, the signal can be efficiently transmitted to the receiving device via the center contact of the dummy built-in coaxial plug. In addition, since the front surface of the first shell of the coaxial plug with a built-in dummy is closed by the flexible closing body, it is possible to prevent dust from entering the inside when the terminal is used as an empty terminal.

Further, the elastic body is disposed between the switch substrate and the lid, and is formed of any one of the first cylindrical body and the second cylindrical body connected to form a double sleeve. The rear half of one of the cylindrical portions located on the lid side may be removed. In this way, by removing the rear half portion located on one of the lid sides of the cylindrical body constituting the elastic body so as to form a double sleeve, the first cylindrical body and the first cylindrical body when pressed are removed. The connecting portion connecting the two cylindrical portions and the cylindrical portion that is not formed as a double sleeve are locally deformed, and can stably move while maintaining the parallel state of the switch substrate. Become like

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of a first embodiment of a dummy built-in coaxial plug of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a first embodiment of a dummy built-in coaxial plug of the present invention.

FIG. 3 is a left side view showing the configuration of the first embodiment of the coaxial plug with a built-in dummy of the present invention.

FIG. 4 is a diagram showing a processing mode of a coaxial cable attached to the dummy built-in coaxial plug according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a detailed configuration of a movable insulator in the coaxial plug with a built-in dummy of the present invention.

FIG. 6 is a diagram showing a detailed configuration of a switch board in the dummy built-in coaxial plug of the present invention.

FIG. 7 is a view showing a detailed configuration of a lid in the dummy built-in coaxial plug of the present invention.

FIG. 8 is a diagram showing a detailed configuration of an elastic body in the first embodiment of the coaxial plug with a built-in dummy according to the present invention.

FIG. 9 is a diagram showing a detailed configuration of a center conductor in the dummy built-in coaxial plug of the present invention.

FIG. 10 is a cross-sectional view showing a configuration of a second embodiment of a coaxial plug with a built-in dummy according to the present invention.

FIG. 11 is a view showing a detailed configuration of an elastic body in a second embodiment of the dummy built-in coaxial plug of the present invention.

FIG. 12 is a sectional view showing a configuration when a dummy built-in coaxial plug according to a second embodiment of the present invention is mounted on a coaxial connector.

FIG. 13 is a cross-sectional view showing a configuration of a third embodiment of the coaxial plug with a built-in dummy according to the present invention.

FIG. 14 is a left side view showing a configuration of a third embodiment of a dummy built-in coaxial plug including the coaxial plug of the present invention.

FIG. 15 is a diagram showing a processing mode of a coaxial cable attached to a dummy built-in coaxial plug according to the second and third embodiments of the present invention.

[Explanation of symbols]

 1, 100, 200 Coaxial plug with built-in dummy 2 Plug part 3 Mounting part 4 Coaxial cable caulking 5 Coaxial cable 10, 30 First shell 11 Movable insulator 12 Center conductor 13 Switch board 14, 24 Elastic body 15 Cover 16 Closure 17 Spring 20 Second shell 40 Third shell

Claims (8)

[Claims] 1. A substantially cylindrical conductive first shell; a substantially cylindrical conductive third shell rotatably mounted on a front portion of the first shell; A conductive second shell attached to a rear portion of the shell, a movable insulator disposed so as to close a front surface of the first shell, and slidable in the first shell; A conductive center contact disposed inside along a substantially central axis of the shell, and a holding piece for holding the center contact; and a conductive piece disposed inside along a substantially central axis of the first shell. A central conductor, an insulative lid fixed to the central conductor so as to close the rear end of the first shell, a contact pattern formed on one surface, and a dummy resistor on the other surface; A connected print pattern is formed, wherein the contact pattern The printed pattern is formed of a printed circuit board connected by a through hole, and the center conductor is inserted into a through hole formed substantially at the center, and the center conductor is contacted with the center conductor in the through hole. A switch board disposed in the first shell on which two patterns are formed; and the contact pattern formed on the switch board,
The switch board is urged to come into contact with a step formed inside the first shell, and includes a first tubular body and a second tubular body connected to form a double sleeve. An insulating elastic body, and in a state where the coaxial connector is not mounted on the third shell, the switch board is urged by the elastic body, so that the step portion of the first shell and the contact pattern are provided. And the center contact is terminated by a dummy resistor provided on the switch board via the center conductor, and when the coaxial connector is mounted on the first shell, the movable insulator Is pushed by the front of the coaxial connector and moves inward,
The coaxial plug with a built-in dummy, wherein the switch board slides to release the contact between the step portion of the first shell and the contact pattern. 2. The second shell is formed so that an insertion portion inserted between a shielding knitting wire of the coaxial cable and an insulating portion extends when the coaxial cable is attached, and the second shell has a center. 2. The coaxial plug with a built-in dummy according to claim 1, wherein a core wire insertion portion into which a core wire of the coaxial cable is inserted is formed at a rear portion of the contact. 3. A closing member made of a flexible material for closing a front surface of the first shell is provided on a front surface of the movable insulator, and the closing member is provided when a coaxial connector is not mounted on the first shell. The coaxial plug with a built-in dummy according to claim 1, wherein a front surface of the first shell is completely closed by a body. 4. The coaxial plug with a built-in dummy according to claim 1, wherein said elastic body is made of silicone rubber. 5. The elastic member is disposed between the switch substrate and the lid, and is formed of a first cylindrical member and a second cylindrical member connected to form a double sleeve. 2. The coaxial plug with a built-in dummy according to claim 1, wherein a rear half of one of the cylindrical portions located on the side of the lid is removed. 6. The coaxial plug with a built-in dummy according to claim 1, wherein a screw portion screwed to a coaxial connector is formed on an inner peripheral surface of the third shell. 7. A plurality of springs that press the outer peripheral surface of the coaxial connector when the extended portion is inserted into the coaxial connector, instead of the third shell. 2. The coaxial plug with a built-in dummy according to claim 1, wherein the coaxial plug is provided on an inner peripheral portion thereof. 8. The coaxial plug with a built-in dummy according to claim 1, wherein the center contact is formed by extending a core wire of a coaxial cable.