JPH1167371A - Television plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a television plug which can also work as a dummy plug for termination. SOLUTION: The end of a ground plug 53 in a cylindrical form is elongated, and inside a plug body 51 a dummy resistance 55 is furnished whose one end is soldered to a ground piece 51-5 formed in a plug body 51, and other end is secured between a pinching piece 51-3 and an insulative support 57. This TV plug is installed to a TV power outlet which is formed as a blank terminal, so that it can serve as a dummy plug for termination. This can be used as a normal TV plug by removing the dummy resistance 55.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television plug which can also be used as a terminating dummy plug detachably attached to a television outlet provided on a wall or the like of each facility in a co-listening system such as a CATV system. Things.

[0002]

2. Description of the Related Art In a co-listening system, each facility such as an apartment house is provided with a television outlet on a wall surface of a room or the like. A user at each facility can receive various broadcasts by attaching a television plug attached to the end of a coaxial cable to the television outlet and connecting the other end of the coaxial cable to an antenna terminal of the television. Has been. By the way, since the number of TV outlets provided in the facility is provided with a margin, all TV outlets have a TV plug attached to the end of the coaxial cable connected to the TV Instead, some terminals are considered to be empty terminals.

As described above, when the television outlet is opened without being terminated, external noise jumps in from the television outlet and deteriorates the quality of a broadcast signal transmitted in the co-listening system. For example, in a strong electric field area of a broadcast radio wave, a radio wave from a transmission tower jumps directly into a television outlet, which causes a ghost before. In addition, since the impedance mismatch occurs due to the open television outlet, the standing wave ratio (VSWR) of the trunk system is disturbed. For this reason, unnecessary oscillations may be caused.For example, unnecessary oscillation signals may jump out of the receiving antenna of the disturbed system, causing a reception failure in the vicinity, or causing a digital broadcast to stop due to an error. Will occur.

Therefore, conventionally, a dummy plug for termination as shown in FIG. 5 is attached to a television outlet which is an unused terminal. As shown in FIG. 5, the terminating dummy plug is a metal dummy plug housing 100 including a connection nut 101 and a dummy resistor housing portion 102.
It has. The resistance value of the dummy resistor housed in the dummy resistor housing section 102 is, for example, 75Ω, which is the same as the system impedance. One end of the dummy resistor is soldered to the rear end of the dummy storage section 102, and the soldered portion is used as a soldering section 103.

[0005]

In the system for co-listening, a dummy plug for termination is attached to the TV outlet which has been set as the vacant terminal as described above in order to prevent a trouble caused by the TV outlet which has been set as the vacant terminal. I am trying to do it. However, since this terminating dummy plug is expensive and cannot be expected to be attached to a TV outlet that has been purchased and vacated by the user, expensive terminating dummies must be attached to all TV outlets when the co-listening system is in operation. There was a problem that had to be. In addition, the terminating dummy plug is removed when the television outlet is in use and becomes unnecessary, so that there is a problem that it is economically wasted.

Accordingly, the present invention provides a dummy plug for terminating when a television outlet is not used, and also serves as a dummy plug for terminating which is attached to one end of a coaxial cable when the television outlet is used and can be used as a normal television plug. The purpose is to provide a TV plug that can be used.

[0007]

In order to achieve the above object, according to the present invention, there is provided a television plug which can be used also as a terminating dummy plug, in a television plug attached to a television outlet, which terminates the television plug. A resistor is detachably provided in the television plug. Further, a shield member for blocking external noise may be provided in the television plug.

Further, a concrete television plug which can also serve as a terminating dummy plug according to the present invention has a substantially cylindrical ground plug having a center conductor disposed substantially at the center, and a ground plug having a front surface. An insulating plug body provided so as to protrude from the plug body; an insulating plug lid body that covers the back surface of the plug body and is detachably fixed to the plug body; And a grounding metal disposed in the plug body, which is fixed to enclose the grounding conductor of the coaxial cable drawn into the plug body, and is electrically connected to the center conductor. A coaxial cable attached to the plug main body, and a core fixing member disposed in the plug main body for fixing a core of the coaxial cable drawn into the plug main body. In There state, and a removable termination resistor arranged between to connect with the core wire fixing member and the grounding bracket. Further, a shield plate for shielding at least the core fixing member may be provided inside the plug lid.

According to such a television plug of the present invention which can also serve as a termination dummy plug, a termination dummy is provided in a television plug attached to one end of a coaxial cable and attachable to a television outlet. The provision of the resistor allows the device to function as a terminating dummy plug by being attached to a TV outlet that has been made an empty terminal. When newly using a vacant terminal, the terminal dummy resistor provided inside the installed television outlet is removed, and a coaxial cable is attached. By attaching the television plug to a television outlet, a broadcast signal can be received by a television connected to the other end of the coaxial cable. As described above, according to the present invention, the terminating dummy plug, which has been wasted in the past, does not occur, and the economic efficiency can be improved. Furthermore, since a shield member for blocking external noise is provided in the television plug, the influence of external noise can be prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a co-listening system according to the present invention in which a large number of television plugs which can also serve as termination dummy plugs are arranged. FIG. 1 shows a configuration of a satellite broadcast receiving system in an apartment house. As an antenna for receiving satellite broadcasts, a UHF antenna 11, VH
The F antenna 12 and the BS / CS antenna 14 are installed on the roof of the apartment house 1. The received signal from the UHF antenna 11 and the received signal from the VHF antenna 12 are mixed and amplified by the UV booster 13 and output.
It is supplied to one input terminal of the BS / CS / UV mixer 16.

A BS / CS-IF reception signal received by the BS / CS antenna 14 and set as an intermediate frequency is
After being amplified in the S booster 15, BS / CS / U
It is supplied to the other input terminal of the V mixer 16. As a result, the UHF reception signal, the VHF reception signal, and the BS / CS-IF reception signal are mixed in the BS / CS / UV mixer 16 and output to the first splitter 17. Then, the received signal input in the first splitter 17 is split into two, and the split received signal is supplied to second splitters 18 and 19, respectively. Then
The received signals divided into two by the second distributor 18 are houses 1-1 to 1-4 of the first unit from the fourth floor to the first floor.
And the second unit house 1-11 from the fourth floor to the first floor
To 1-14.

The received signals divided into two by the second distributor 19 are the third unit houses 1-31 to 1-34 from the fourth floor to the first floor, and the reception signals from the fourth floor to the first floor. 4 units of houses 1-41 to 1-44, respectively. When supplying the reception signal to the house of each unit, the reception signal is supplied to each house by connecting the series units in series. For example, in the first unit, the serial units 20-1, 20-2, 20-3, and 20-4 are cascade-connected to the output terminal of the two-way distributor 18, and the serial units 20-1 to 20- are connected. 4
Are installed in each house. The second to fourth units have the same configuration. However, the series unit connected to the last stage of each unit is for the terminal, and the terminating end of the coaxial cable is terminated by a terminating resistor provided inside.

In the thus configured co-listening system, for example, as shown in the serial unit 21-4,
The television plug of the present invention is attached to the television outlet of the series unit 21-4, and the other end of the coaxial cable is
It is connected to the S / CS / UV demultiplexer 31 and is demultiplexed into a BS / CS reception signal and a UV reception signal. Demultiplexed BS
The / CS signal is supplied to the BS / CS tuner 32, and its output is supplied to the display 33. The split UV signal is supplied to the display 33 as it is. Further, when the display and the BS / CS tuner 32 are integrated, the serial unit 23 of FIG.
As shown in -4, the television plug of the present invention is attached to the television outlet of the series unit 23-4, and the other end of the coaxial cable is connected to the BS / CS / UV duplexer 41. The demultiplexed BS / CS reception signal and UV reception signal are supplied to the integrated receiver 42, respectively.

In such a co-listening system, for example, even if noise enters from outside into the TV outlet of the series unit 20-2 which is not used, a TV plug with a built-in terminating resistor is attached to the TV outlet. Therefore, it is possible to prevent the quality of the broadcast signal in the co-listening system from deteriorating due to noise. Therefore, an embodiment of a television plug which can also serve as a termination dummy plug of the present invention will be described.

FIGS. 2A and 2B are views showing an example of the appearance of an embodiment of a television plug which can also serve as a terminating dummy plug according to the present invention. FIG. FIG. 2B is a side view of the plug, and FIG. As shown in these drawings, the television plug 50 is provided so as to protrude from a front surface of the plug main body 51, a resin plug cover 52 fitted to the plug main body 51, and a plug main body 51. And a ground plug 53 made of metal. The plug body 51 and the plug lid 52 are rotatably connected to each other by a connecting portion 54. The plug body 51 and the plug lid 52
And the connecting portion 54 may be formed by integral molding.

In the example shown in FIG.
0 is attached to the television plug 50, but the television plug of the present invention has a characteristic point particularly when the coaxial plug 60 is not attached, and the configuration is shown in FIGS. 3 (a) and 3 (b). Show. 3A shows a state in which the plug lid 52 is detached from the plug main body 51, and FIG. 3B shows a cross section of the plug main body 51. FIG.
(A) As shown in FIG.
The plug body 52 connected to the plug lid 52 by the plug body 5
An engagement piece 51-2 that engages with the plug main body 51 when fitted to the plug 1 is formed. Further, a shield plate 52-2 is provided on the upper half of the plug lid 52 so as to cover the core portion of the coaxial cable exposed in the television plug. The coaxial cable 60 exposed in the television plug 50 by the shield plate 52-2.
The core wire portion and the portion to which the core wire is attached are shielded to prevent noise from jumping in from the outside.

Also, from the front of the plug body 51, FIG.
As shown in (b), a grounding plug portion 53 having a substantially cylindrical cross section is projected, and a center conductor 56 is provided substantially at the center thereof.
Are arranged. The earth plug portion 53 is a portion connected to the earth portion when the device is attached to a television outlet, and the center conductor 56 is a portion connected to a portion for transmitting and receiving signals. The metal plate forming the ground plug 53 is extended into the plug main body 51 to form a ground metal fitting 51-5. This earth metal fitting 51-
Reference numeral 5 has a function of holding and fixing the coaxial cable when the coaxial cable is attached, and a function of connecting a ground conductor of the coaxial cable.

The center conductor 56 is fixed by an insulating support portion 57 so as to be located substantially at the center of the ground plug portion 53. A core wire fixing screw 51- for fixing the core of the coaxial cable is fixed to the insulating support portion 57. 2 are installed. A metal holding piece 51-3 is arranged between the core wire fixing screw 51-2 and the insulating support portion 57. That is, the core wire of the coaxial cable is held between the holding piece 51-3 and the insulating support portion 57, and is fixed by screwing the core wire set screw 51-2. Further, a U-shaped upright portion 51-4 is provided upright on the plug body 51 so as to surround the mounting portion of the core wire set screw 51-2. Further, an engaging portion 51-1 with which the engaging piece 52-1 of the plug lid body 52 engages is formed corresponding to the engaging piece 52-1.

In order to terminate the TV plug 50 when the TV outlet in the series unit is a vacant terminal, the dummy resistor 55 is connected to the plug body 51.
It is provided within. One lead 55-1 of the dummy resistor 55 is held between the holding piece 51-3 and the insulating support portion 57, and is electrically connected to the center conductor 56 by screwing the core wire fixing screw 51-2. Connected. Further, the lead at the other end of the dummy resistor 55 is soldered to the earth metal fitting 51-5. As a result, the center conductor 56 is terminated by the dummy resistor 55. Therefore, when such a TV plug 50 is attached to a TV outlet which is not used, the TV outlet can be terminated. After the dummy resistor 55 is mounted in the plug main body 51 as described above, the plug lid 52 is fitted to the plug main body 51.

Next, an embodiment of the TV plug 50 of the present invention when a TV outlet which has been used as a vacant terminal is newly used will be described with reference to FIGS. 4 (a), 4 (b) and 4 (c). 4A shows a coaxial cable to be attached to the television plug 50, and FIG. 4B shows a plug lid 52.
FIG. 3C shows the configuration of the TV plug in which is opened.
Shows a cross-sectional view taken along the line BB. When using a TV outlet that has been set as a vacant terminal, the TV plug 50 according to the present invention attached to the TV outlet to be newly used is removed, the plug lid 52 is opened, and the plug main body 51 is removed. Expose the inside.
Then, the core wire set screw 51-2 is loosened, and the soldered lead is cut off with a nipper or the like, thereby removing the dummy resistor 55 attached inside.

In this state, the coaxial cable 60 processed as shown in FIG. 4A is attached to the plug body 51. That is, the jacket of the coaxial cable 60 is removed, and the exposed ground conductor 61 is folded over the jacket. Next, the core wire 63 is exposed by removing the first half of the exposed internal insulator 62. The ground conductor 61 folded on the outer surface of the coaxial cable 60 thus processed is inserted into the grounding member 51-5, and the grounding member 51-5 is narrowed with pliers or the like so as to reduce its diameter. As a result, the ground metal 51-5 cuts into the coaxial cable 60, and the coaxial cable 60 is fixed to the plug body 51. At this time, the ground conductor 61 is electrically connected to the ground metal 51-5.

Further, the core wire 63 of the coaxial cable 60 is
Being held between the holding piece 51-3 and the insulating support portion 57,
By screwing the core wire fixing screw 51-2, the center conductor 5
6 is electrically connected. Then, by plugging the plug lid 52 into the plug main body 51 and mounting it on a television outlet, a broadcast signal can be transmitted to the television via the coaxial cable 60 attached to the television plug 60.

As described above, according to the TV plug of the present invention, when the TV outlet is used when the TV outlet is vacant, the TV plug functions as a terminal dummy plug, and the coaxial cable is attached by removing the internal dummy resistor. Thereby, it can be used as a normal television plug. Therefore, if the TV plug of the present invention is attached to the TV outlet of the series unit at the time of the co-listening system, it becomes a dummy plug for termination when it becomes an empty terminal, and it is used as a normal TV plug when used. Will be able to

[0024]

Since the present invention is constructed as described above, a terminating dummy resistor is provided in a television plug attached to one end of a coaxial cable and attachable to a television outlet. Therefore, by attaching to a TV outlet which has been made an empty terminal, it functions as a dummy plug for termination. When newly using a vacant terminal, the terminal dummy resistor provided inside the installed television outlet is removed, and a coaxial cable is attached. By attaching the television plug to a television outlet, a broadcast signal can be received by a television connected to the other end of the coaxial cable.

As described above, according to the present invention, it is possible to provide a television plug that can also serve as a termination dummy plug. Can also be improved. Furthermore, a shield member for blocking external noise is provided inside the TV plug, and when the TV plug is a dummy plug for termination, and when the TV plug is in a normal use state, It can be prevented from being affected by external noise.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an example of a co-listening system to which a television plug of the present invention is applied.

FIG. 2 is a diagram illustrating an example of an appearance of a television plug according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating an example of a configuration of a television plug according to an embodiment of the present invention.

FIG. 4 is a diagram showing an aspect when used as an original television plug in the television plug of the present invention.

FIG. 5 is a diagram showing a conventional termination dummy plug.

[Explanation of symbols]

 1 Apartment House 11 UHF Antenna 12 VHF Antenna 13 UV Booster 14 BS / CS Antenna 15 BS / CS Booster 16 BS / CS / UV Mixer 17, 18, 19 2 Distributor 50 TV Plug 51 Plug Body 52 Plug Cover 53 Earth Plug part 54 Connecting part 55 Dummy resistor 56 Center conductor 57 Insulation support part 60 Coaxial cable

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Koji Enomoto 4-7-4 Kitamachi, Warabi City, Saitama

Claims (4)

[Claims] 1. A television plug attached to a television outlet, wherein a terminating resistor for terminating the television plug is detachably provided in the television plug. TV plug that can. 2. The television plug according to claim 1, wherein a shield member for shielding external noise is provided in the television plug. 3. A substantially cylindrical ground plug having a center conductor disposed substantially at the center, an insulative plug body provided such that the ground plug protrudes from a front surface, and a back surface of the plug body. An insulative plug lid that is removably secured to the plug body while being wrapped, and electrically connected to the ground plug portion;
An earthing member disposed in the plug body, which is fixed to enclose the earth conductor of the coaxial cable drawn into the plug body, and electrically connected to the center conductor, and A core wire fixing member provided in the plug main body for fixing the core wire of the drawn coaxial cable, and a connection between the core wire fixing member and the grounding member in a state where the coaxial cable is not attached to the plug main body. And a detachable terminating resistor provided so as to provide a television plug that can also serve as a terminating dummy plug. 4. A television plug that can also serve as a terminating dummy plug according to claim 3, wherein a shield plate that covers at least the core wire fixing member is disposed inside the plug lid. .