JP2003061059A - Cable television telephone tap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable television telephone tap which can be placed at optional place of a coaxial cable and with which a cable television service and a telephone service can conducted simply and economically, and a system extension, replacement and revision work can simply and economically be conducted. SOLUTION: The cable television telephone tap distributes and supplies a high frequency signal and a telephone current to subscribers by utilizing the coaxial cable. The tap includes a case, including at least an upper case 1 and a lower case 2 which are integrated through combination into a single case, a plurality of distribution terminals 9 placed to the wall face of the upper case or the lower case and supplying the high frequency signal to the subscribers, a plurality of wire through-holes 7, 7' through which telephone current distribution wires 50 are inserted, and an operation window 12 in the inside of which a plurality of combinations of wire connectors 5, 30 and current limit elements 6, 29 provided in the vicinity of a rising part of the wire through- holes, corresponding to the through-holes are arranged in order to connect the current distribution wires placed on the wall face of the upper case or the lower case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable television / telephone tap, and more particularly to delivering a TV high frequency signal from a TV signal transmission system to a subscriber through a coaxial cable and at the same time transmitting a TV high frequency signal to the coaxial cable. The present invention relates to a cable television / telephone tap for supplying a low-frequency current to a telephone by overlapping or separately providing current distribution wiring.

[0002]

2. Description of the Related Art Conventionally, as a device for guiding a high-frequency signal from a signal transmission system using a coaxial cable to an electronic device, a tap-off, which is widely used in a cable television or a TV joint listening facility in an apartment house, is a typical example. is there.

FIG. 9 shows an outline of a conventional CATV shared reception facility using a tap for TV signals. Figure 9
1, 101, 102, 103 and 104 are antenna groups for receiving TV signals, and 101 and 102 are parabolic antennas in the SHF band for receiving BS and CS.
03 for VHF band terrestrial reception, and 104 for UHF
The antenna for receiving the ground wave of the band is shown.

Each TV signal received by these antenna groups is introduced into the mixer amplifier 121 by the coaxial cables 105, 106, 107 and 108. Besides this, CATV
In the listening / receiving equipment, the video tape programs from the VTRs 122, 123, and 124 are processed by the mixer 125, guided to the input of the mixer amplifier 121 and set to a predetermined output level, and then the main line amplifier 131. Enter the input.
The branch amplifier 132 represents a four-way divider, and
The distributed CATV signal is tapped off 133,134.
Is distributed to each TV viewer 140.

FIG. 10 shows an outline of the structure of a conventional CATV tap. In FIG. 10, the input terminal 151 is shown.
Is connected to the inner conductor of the coaxial cable and serves to guide a high-frequency signal inside the housing.
The outer conductor is insulated with respect to, and the outer conductor is grounded to the housing 152 by the input terminal 151 and the coaxial connector shell 154.
Similarly, the output terminal is attached to the side surface of the housing opposite to the input terminal 151 in the same manner as the input terminal 151.

The branch terminal 153 is a lower housing 152 of the housing.
Is provided on the surface of. The housing is screwed to the messenger wire with a strand clamp 155.

FIG. 11 shows a tap-off circuit configuration in which a telephone low-frequency current is caused to flow in addition to a high-frequency signal in order to use the CATV tap-off also in a telephone. The directional coupler DC and The branching device SP is used to branch the high frequency signal, and the telephone low frequency current is shunted to the subscriber terminal B using the choke coil L to be superimposed on the high frequency signal for distribution.

[0008]

Here, the conventional tap-off is originally designed for CATV, not for telephone.

That is, even if it is suitable for the CATV service, it is not configured to perform the wiring work for the low frequency current in order to perform the service for the telephone, and the case is used for handling the wiring for the low frequency current. It is necessary to open the body cover and connect it, and workability is poor.

The present invention has been made in consideration of the above points, and can be set at an arbitrary position of a coaxial cable, and the service for cable television and the service for telephone can be performed easily and economically, and the system can be expanded. Cable television that allows easy and economical replacement and change work
The purpose is to provide a telephone tap.

[0011]

To achieve the above object, according to the present invention, in a cable television / telephone tap which uses a coaxial cable to distribute a telephone current together with a high frequency signal to a subscriber, at least an upper casing. A casing that includes a body and a lower casing and is integrated with each other, and a plurality of branch terminals that are arranged on the wall surface of the upper casing or the lower casing and that supply the high-frequency signal to the subscriber. A plurality of electric wire through holes for passing the telephone current distribution wires, and a plurality of combinations of electric wire connectors and current limiting elements provided corresponding to the electric wire through holes in the vicinity of the rising portion of the electric wire through holes. And an operation window for connecting the current distribution wiring provided on the wall surface of the upper casing or the lower casing. ® down, telephone tap, it is intended to provide.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing the outer appearance of a first embodiment according to the present invention. This FIG. 1 shows an upper housing 1
Of the upper casing 1,
Three terminals, namely input / output terminals 1-1, 1-2 and 1-
3 and a strand clamp 4-1 and 4-2 for suspending it on the messenger wire. In contrast to the upper case 1, the lower case 2 is
It is fixed by united bolts 8-1, 8-2, 8-3.
There are three other similar merging bolts, but not shown in FIG.

An operation window 12 surrounded by a flange 3 is provided on a side surface of the upper housing 1, and a current distribution connector 5 attached to the lower housing 2 is connected to, disconnected from and connected to the operation window 12 through the operation window 12. The attachment / detachment of the limiting element 6 is operated. This operation window 12
Is provided with a door 3'supported by a hinge 3 ". Bolts 10-1 and 10-2 (not shown) attached to the door 3'by a drop-preventing structure are attached to the upper housing 1 Internal thread 11- provided on the outer side of the flange 3 in
The door 3'is fixed by tightening it to 1, 11-2.

Here, the door 3'and the upper casing 1 have a waterproof structure due to the waterproof gasket 13 in the flange 3 portion. Although not shown in FIG. 1, electromagnetic shielding may be enhanced by providing a metal mesh gasket inside the waterproof gasket 13.

A through hole 7 for passing a current distribution line is formed in a pressing plate 14 arranged inside the operation window 12 for pressing a polymer compound which is a pressure-responsive filling material.
Like the current distribution connector, the number of through holes 7 is the same as the number of branch terminals for high frequency signals.

FIG. 2 is a perspective view of the embodiment shown in FIG. 1 as viewed obliquely from the lower side in substantially the same direction as FIG. FIG. 2 shows the appearance of the lower housing, and eight high-frequency signal branch terminals 9 are provided in a straight line at the center. Then, the hole 7 opened in the pressing plate 14 for pressing the polymer compound shown in FIG.
There is a through hole 7'through which the current distribution line opened in the lower housing 2 passes at a position corresponding to.

FIG. 3 shows the upper housing 1 in the embodiment of FIG.
It is a perspective view showing the internal structure of. In FIG. 3, the input / output terminals will be described by taking 1-3 of the input / output terminals 1-1 to 1-3 as an example.

The input / output terminal is formed as a female screw cut on the upper housing 1, and a fitting-type connector for a trunk line is screwed into the female screw from the outside of the housing, and the core wire penetrates the contact post 1-3 '. After being inserted into the hole 1-3'a, it is tightened with the potato screw 1-3'b. Printed wiring board 4 attached near the ceiling board of upper housing 1
Various electrical parts are attached to the upper case 0 and attached to the upper housing 1 with screws.

Of the electric components mounted on the printed wiring board 40, the main components are choke coils 21-1, 21-2, 21-3 for blocking high frequencies and capacitors 22-1, 22-2 for passing high frequencies. , 22-3.

The high frequency jumper plug 23, which is composed of the printed wiring board 40 and three leads, is inserted and mounted in a socket in which the leads are soldered to the printed wiring board 40.

Here, of the three leads, two at both ends are connected by a printed wiring board 40, and the center lead is used as a ground pattern and serves to match impedance at high frequencies. .

The socket 23-1 into which the jumper plug 23 is inserted is connected to the input / output terminal 1-1 through a circuit pattern (not shown) and the capacitor 22-1, and similarly, the socket 23-2 is connected through the capacitor 22-2 to the input / output terminal. 1-2, and the socket 23-3 is also connected to the input / output terminal 1-3 through the capacitor 22-3.

The other two sockets are for the printed wiring board 4
It is connected to the 0 ground pattern. Therefore, the jumper plug 23 is connected to the socket 23-1 and the socket 23.
-2 and the socket 23-1
And socket 23-3 so that they are short-circuited,
You can switch between aerial mount and pedestal mount.

The directional coupler 24 provided at the center of the printed wiring board 40 is surrounded by a shield case. The directional coupler 24 is inserted into a socket attached to the printed wiring board 40, but it is structurally bilaterally symmetric, and the direction of the high-frequency signal can be changed depending on the insertion method.

The male connector 25 of the sliding type coaxial connector for high frequency signals, which is provided near the directional coupler 24 and connects the upper casing 1 and the lower casing 2, has the coaxial connector shown in FIG. The outer peripheral threaded portion of the female side 25 'is slidably inserted and connected.

The printed wiring board 40 is also provided with pins 26 on the male side of the connector for transmitting a telephone current to the electric circuit of the lower housing. This pin 26 is shown in FIG.
Is connected to a socket (female side) attached to the partition wall 43 of the. However, this socket is not shown.

Here, the cable television of the present invention
In the telephone tap, the lower housing 2 may be removed in an energized state in order to change the branch amount (tap value) of the high-frequency signal after installation energization.

In this case, even if the upper housing 1 and the lower housing 2 are out of contact with each other, if the telephone current connector 26 is in contact with the upper housing 1 and the lower housing 2, the human body holding the lower housing 2 passes through Electricity may flow to the ground and cause electric shock.

Therefore, the contact metal spring pieces 41-1 and 42-2 contact the outer side surfaces of partition walls 43-1 and 43-2 of FIG. 4 described later until the lower housing 2 is completely removed. A ground current is passed through the case of the upper housing 1 to prevent electric shock. A metal mesh gasket (not shown) or the like may be placed in the grooves 42-1 and 42-2 to further enhance the shielding effect.

FIG. 4 is a perspective view showing the internal structure of the lower casing 2 of the embodiment shown in FIG. 1, showing the inside of the lower casing 2 when there are eight high-frequency signal output terminals. Show. A part is shown in cross section.

The lower housing 2 is provided with a printed wiring board 54 arranged in parallel with the bottom wall, and the printed wiring board 54 is provided with a distribution circuit and a capacitor which will be described later with reference to FIG. Has been.

A printed wiring board 56 is provided inside the lower housing 2 so as to be fixed to a partition wall 43 made of a conductive material. On the printed wiring board 56, a current limiting element 6 and a current distribution terminal are provided. Is installed. The partition wall 43 is inserted into the grooves 42-1 and 42-2 of the lower housing 2 and fixed by screws 53 (partly not shown).

As a result, both side walls 43 of the partition wall of the lower housing 2 are provided.
-1 and 43-2 enter the grooves 42-1 and 42-2 of the upper housing 1, and when the upper housing 1 and the lower housing 2 are united, the two housings 1 and 2 are connected to each other. The inside of the housing 1 and the opening of the window 12 are electrically shielded.

A current distribution line 50 for distributing a telephone current is connected to the printed wiring board 56 supported by the partition wall 43. The current distribution line 50 is connected to the current distribution connector 5
And the lower case 2 connected to the current limiting element 6.
Through the rubber gasket 51 through the through hole 7'of
It is connected to the current distribution terminal block 5 through the through hole 7 of the pressing plate 14. Then, a through hole having a diameter slightly smaller than the outer diameter of the current distribution wire 50 is opened in the gasket 51, and the current distribution wire 50 is press-fitted and inserted into the through hole 7 '.

Further, since the pressing plate 14 is compressed by the screws 52-1 and 52-2 (not shown), the lower housing 2
And the packing 51 formed of a pressure-sensitive material such as a polymer compound are kept in a pressurized state to waterproof them, and the compression of the packing 51 further adheres to the current distribution wiring 50.

The polymer compound includes, for example, room temperature curable silicone rubber, and magnetic powder may be further mixed therein. Therefore, even if the current distribution wirings 50 have different diameters, an excellent waterproof effect is exhibited.

FIG. 5 is a sectional view showing another example of the waterproof structure applied to the embodiment of FIG. FIG. 5 shows another structure of the waterproof structure portion. In this case, the current distribution wiring 50 passes through the through hole 207 of the rising portion 204 of the lower housing through the rubber stopper 201 having a through hole having a diameter substantially equal to that of the electric wire. Through hole 20 of lower housing 204
The 7th part is extended in the shape of a cylinder toward the outside, and the outer peripheral surface is threaded.

The rubber stopper 201 through which the current distribution wiring 50 is passed is
When it is contracted by the lid 203 via the washer 202, it contracts and comes into close contact with the current distribution wiring 50, and also comes into close contact with the inner wall of the through hole 207 of the rising portion 204 of the lower housing, so that an excellent waterproof effect is exhibited. Inside the lower housing 204, the current distribution wiring 50 passes through the magnetic body 205 and the pressing type pressing plate 206, so that an electromagnetic shield effect can be provided.

FIG. 6 shows the circuit configuration of the embodiment shown in FIG. 1, and the cable television telephone according to the present invention is exemplified by the case where the embodiment shown in FIG. 1 has four output terminals for high frequency signals. The circuit structure for demonstrating operation | movement of a tap is shown. In the circuit shown in FIG. 6, the input / output terminals 1-1, 1-2, and 1-3 are connected to the main line high-frequency cable. Choke coil 21-inserted in the main line
1, 21-2 and 21-3 allow only the telephone low frequency current flowing through the main line to pass therethrough, and have a high impedance for a high frequency signal to prevent passage.

On the other hand, the capacitors 22-1, 22
-2 and 22-3 allow the high frequency signal flowing through the main line to pass therethrough, and have a high impedance to the low frequency current for the telephone, and block this.

Here, the cable television / telephone tap can be installed by using the so-called "aerial mount", which is mainly used by attaching it to a messenger wire stretched between electric poles, and by burying the cable underground. It is divided into a so-called "pedestal mount", which is used by attaching it to the pedestal box.

In the case of the aerial mount, the trunk coaxial cable is connected to the input / output terminals 1-1 and 1-2,
A cover having a waterproof structure is attached to the input / output terminals 1-3 for protection. In the case of a pedestal mount, connect the trunk coaxial cable to the input / output terminals 1-1 and 1-3,
A lid having a waterproof structure is attached to the input / output terminal 1-2 for protection. In each case of the aerial mount and the pedestal mount, a high frequency jumper plug 23 for switching the line through which the high frequency passes is provided.

The directional coupler 24 includes an input terminal 24-1 as a directional coupler and a branch terminal 24- of the directional coupler.
2. It has an output terminal 24-3 as a directional coupler.
The directional coupler 24 is a plug-in unit, and is inserted into the socket of the printed board on which the choke coil 21 and the capacitor 22 are attached.

Therefore, the high frequency signal is input to the input / output terminal 1-
2 → When input / output terminals 1-1 flow, by inserting the directional coupler 24 in reverse, the input / output terminals 1-1, 1
It is possible to cope with the signal flow of the main line without reconnecting -2.

In FIG. 6, the input terminal 24-1 of the directional coupler is connected to the capacitor 22-1 side, and the output terminal 24-3 of the directional coupler is connected to the capacitor 22-3 side through the jumper plug 23. Since it is connected, the state of the pedestal mount having the input terminal 1-1 and the output terminal 1-3 of the cable television telephone tap is shown.

The branch terminal of the directional coupler 24 is the distributor 27 on the printed wiring board attached to the lower casing.
To the high frequency coaxial connector 25. Here, the case of four distributions is shown, and a DC component of each distributed output is blocked by the capacitor 28-1 → capacitor 28-4, and only the high frequency signal is connected to the output terminals 9-1 to 9-4.

The telephone current is supplied to the choke coil 21-1,
21-2, 21-3, the current limiting elements 29-1 to 29- on the printed wiring board, which are taken out from the connection point of 21-2 and 21-3, pass through the connector 26 that divides the upper casing and the lower casing, and through the feedthrough capacitor 31. 4 (current limiting element 6 in FIG. 4) and connected to current distribution connectors 30-1 to 30-4 (current distribution connector 5 in FIG. 4). Note that one side of each current distribution connector 30 is connected to the ground.

The current limiting element 29 connected to the current distribution connector 30 serves to prevent an overcurrent of the device, and when an excessive current flows due to a short circuit on the terminal side or the like, the cable is prevented. It serves to protect television and telephone taps and systems.

Further, the current limiting element 29 is inserted into a socket on the printed wiring board attached to the lower housing, and limits the current to the subscriber who joins the CATV but not the telephone. By pulling out the element 29, it also functions as a switch for preventing telephone power from being supplied to non-subscribers to the telephone.

The parts not enclosed by the dotted line in FIG. 6 are mounted on the printed wiring board housed in the upper casing, and the inside of the dotted line and the inside of the double dotted line are in the lower casing. included. Then, the components within the double dotted line are mounted on the printed wiring board 56 in FIG.

FIG. 7 shows a CATV using the embodiment of FIG.
It is a conceptual diagram which shows one structural example of a system. This Figure 7
The subscriber side is shown from tap-off 1 when a low frequency current for telephone is supplied in addition to the conventional television signal using the CATV line.

On the trunk line 4, a telephone power source is superposed in addition to television and telephone signals. The television signal and the telephone signal are distributed by tap-off 1, and the subscriber's home 5-is provided by the coaxial cables 2-1 and 2-2.
1 and 5-2. Telephone power is distributed by tap-off 1 and distributed to subscribers' homes by power lines 3-1 and 3-2.

FIG. 8 shows a second embodiment of the present invention. In this case, a window 12 for operating a current limiting element, a current distribution connector and the like is provided in the same housing having through holes for a high frequency branch terminal and a telephone current output wire. This window 12 is not in the upper housing 1 but in the lower housing 2.

With this structure, the window 1
A waterproof packing for distribution wiring is applied around 2, and this window 12
May be passed through and the current distribution wiring may be wired to the terminal. With this configuration, even if the upper housing 1 and the lower housing 2 are separated, the current distribution wiring does not get entangled with the upper housing 1.

[0055]

As described above, the present invention provides a plurality of wire through holes and a wire through hole in the vicinity of the wire through hole in a casing of a cable television telephone tap commonly used for CATV and telephone. Since the operation window provided with the combination of the electric wire connector and the current limiting element is provided, the work for telephone service can be performed with good workability.

[Brief description of drawings]

FIG. 1 is a perspective view showing an external shape of a first embodiment of the present invention.

FIG. 2 is a perspective view of the embodiment shown in FIG. 1 as viewed from below.

FIG. 3 is a perspective view showing the internal structure of the upper housing in the embodiment of FIG.

FIG. 4 is a perspective view showing an internal structure including a waterproof structure of a lower housing of the embodiment of FIG.

5 is a cross-sectional view showing another example of the waterproof structure applied to the embodiment of FIG.

6 is a circuit diagram showing a circuit configuration in the embodiment of FIG.

FIG. 7 is a conceptual diagram showing a configuration example of a CATV system using the embodiment of FIG.

FIG. 8 is a perspective view showing the outer shape of a second embodiment of the present invention.

FIG. 9 is a diagram illustrating a system using tap-off used in a conventional CATV system.

FIG. 10 is an explanatory diagram showing a structure of a tap used in a conventional CATV system.

FIG. 11 is a block diagram showing a circuit configuration of a general cable television / telephone tap for superimposing a telephone power supply on a coaxial cable.

[Explanation of symbols]

1-1, 1-2, 1-3 input / output connector 1 Upper case 2 Lower case 3 flange 4,55 Strand Clamp 5,30 Current distribution wiring connector 6,29 Current limiting element 7 Current distribution wiring through hole 8 coalescing bolts 9 High frequency signal connector 10 volts 11 female screw 12 Operation window 13 Waterproof gasket 14 Press plate 21 choke coil 22 Capacitor 23 jumper plug 24 directional coupler 25 high frequency coaxial connector 26 coaxial connector 27 distributor 28 capacitors 40, 54, 56 Printed wiring board 41, 42 Metal spring pieces 43 partitions 50 current distribution wiring 51 packing 52, 53 screw 201 rubber stopper 202 washer 203 lid 204 Rising part 205 magnetic 206 Presser plate 207 through hole

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Claims (4)

[Claims] 1. A cable television telephone tap for distributing a telephone current together with a high frequency signal to a subscriber by using a coaxial cable, including at least an upper casing and a lower casing, and being integrated with each other. Housing, a plurality of branch terminals arranged on the wall surface of the upper housing or the lower housing to supply the high-frequency signal to the subscriber, and a plurality of electric wires for passing the telephone current distribution line. Through hole,
A plurality of combinations of electric wire connectors and current limiting elements provided corresponding to the electric wire through holes near the rising portion of the electric wire through holes are arranged inside, and the upper housing or the lower housing is provided. A cable television / telephone tap, comprising: an operation window for connecting the current distribution wiring provided on the wall surface of the. 2. The cable television / telephone tap according to claim 1, wherein the operation window is a waterproof window having a flange on an outer periphery thereof. 3. The cable television telephone tap according to claim 1, wherein the wire through hole is provided with a pressing material. 4. The cable television telephone tap according to claim 1, wherein the wire through hole is provided with a rubber plug and a screw-type lid for pushing the rubber plug into the wire through hole. Tap.