JPH0411344Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a terminal connection device, and particularly relates to a technology that is effective when applied to television shared viewing equipment.

[Prior art]

Conventionally, matching boxes for television public viewing can be used either when the input is a 750Ω coaxial cable or a 300Ω feeder.

In a circuit using a coaxial cable with an output impedance of 75 Ω, as shown in Figure 10, ``When using with an output impedance of 75 Ω, please cut the part indicated by the arrow.''"part" has been removed from the device. As shown in FIG. 11, once this "circuit part to be disconnected" is disconnected, it is difficult to return it to its original state when it is desired to use it with an output impedance of 300Ω. For this purpose, the portion to be separated is made into a switch, or the number of turns of the matching transformer G is unbalanced to prevent separation.

In addition, structurally, as shown in FIGS. 10 to 12, one terminal A of two terminals A and B connecting the lead wires F ₁ and F ₂ of the feeder F with an output impedance of 300Ω is connected to the output impedance. Since it is used as a terminal for the center conductor D of the 75Ω coaxial cable C, the holding member E that holds the coaxial cable C is
Align the center of the cable insertion groove with the cable insertion groove of the two terminals A and B of the feeder F with an output impedance of 300Ω, or insert the center conductor D of the coaxial cable C with an output impedance of 75Ω as shown in Fig. 12. centering on the groove of the terminal
The width of the holding member E was widened to make it easier to insert the feeder F with an output impedance of 300Ω.

[Problem that the invention attempts to solve]

However, in the conventional system shown in Figs. 11 and 12, when using a coaxial cable, (1) when a part of the circuit is cut, the output impedance
It will be very troublesome to return it to 300Ω. In addition, (2) using a switch method causes switching errors and increases costs. Additionally, (3) if the matching transformer G is used with an unbalanced number of windings and uncut, there is a problem of increased insertion loss at the high frequency signal level due to stray capacitance caused by the matching transformer G. Ta.

Furthermore, in the conventional method shown in FIG. 11, the center conductor D of the coaxial cable C had to be bent at its tip, which caused the problem that it would break during bending.

Further, in the method shown in FIG. 12, there was a problem that the width W of the holding member E became wide, and the entire matching device became large.

The present invention was made to solve the above problems, and another purpose of the present invention is to improve the output impedance of 75Ω.
An object of the present invention is to provide television communal listening equipment that can automatically switch between output impedances of 75Ω and 300Ω without providing a cut-off part or switch for switching between 75Ω and 300Ω, and without increasing insertion loss. .

The above and other objects and novel features of the present invention will be explained by the following description of the specification and the accompanying drawings.

[Means for Solving the Problems] Among the devices disclosed in the present application, a brief overview of typical devices is as follows.

A connecting terminal for connecting the outer conductor of a coaxial cable with an output impedance of 75Ω is formed on one side of the housing body 1, and a pattern is formed on one side of the connecting terminal for connecting the center conductor of the coaxial cable. A second terminal, and a pattern is formed on both sides of this second terminal, and the output impedance is 3.
Comprising a first terminal and a third terminal for connecting a lead wire of a 00Ω feeder, and a matching transformer connected between the first terminal and the third terminal,
Furthermore, a substrate is provided in front of the third terminal, on which connection parts are formed at predetermined intervals to short-circuit the second terminal and the third terminal by the lead wire of the inserted feeder wire, and 1 terminal, 2nd terminal,
A guide member disposed above the third terminal and provided with a groove for guiding the center conductor of the coaxial cable and a pair of lead wires of the feeder wire, and the center conductor of the coaxial cable and the pair of feeder wires guided by this guide member. a holding member that presses and fixes the lead wires to the first, second, and third terminals; and a holding member that fixes the coaxial cable whose outer conductor is connected to the connection terminal; It is characterized by a structure in which a holding member is provided to press and fix the holding member.

[Effect]

According to the above-mentioned means, when one lead wire of the feeder is connected to the third terminal and the other lead wire is connected to the first terminal, the third terminal and the second terminal are connected by one lead wire. A short circuit occurs through the
It is used at 300Ω.

On the other hand, when the center conductor of the coaxial cable is connected to the second terminal, the second terminal and the third terminal are not short-circuited, so that the coaxial cable is used at 75Ω.

This results in an output impedance of 75Ω.
The output impedance can be automatically switched between 75Ω and 300Ω without providing a cutout or switch for 300Ω switching and without increasing insertion loss.

[Example of idea]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In addition, in all the figures for explaining the examples,
Components having the same function are given the same reference numerals, and repeated explanations thereof will be omitted.

[Example] Fig. 1 is an exploded perspective view showing the configuration of the main parts of an embodiment in which the present invention is applied to a matching box for common television listening. Fig. 2 is an assembled perspective view of Fig. 1. Fig. 3 FIG. 4 is a plan view for explaining the terminal connection when using a coaxial cable with an output impedance of 75Ω, and FIG. 4 is a plan view for explaining the terminal connection when using a feeder with an output impedance of 300Ω.

As shown in FIGS. 1 to 4, the matching box for TV common listening of this embodiment has a coaxial cable having an output impedance of 75 Ω at a predetermined position on one side of the housing body 1 made of an insulator of the matching box for TV common listening. cable 13
An outer conductor connection terminal 2 is provided to connect the outer conductor (braided body) 13A (FIG. 3). A coaxial cable holding member 3 for electrically connecting the terminal 2 and the outer conductor 13A of the coaxial cable 13 is fixed to the outer conductor connecting terminal 2 from above with a set screw 4 such as a screw. In this case, flat receiving portions 21 are formed on both sides of the connection terminal 2 in order to hold the feeder 14 between the holding members 3.
A board 20 is disposed at a predetermined position of the housing body 1, and the lead wire 14B (fourth
A first terminal 5 for electrically connecting one end of the matching transformer 19 to the matching transformer 19 is patterned in the forward direction into which the center conductor 13B of the coaxial cable 13 having an output impedance of 75Ω is inserted. A connecting portion 6A to which the center conductor 13B of the coaxial cable 13 having an output impedance of 75Ω is electrically connected in parallel with this first terminal 5 (an output terminal 20 connected to the connecting portion 6A)
is indicated by an arrow. ) and the other lead wire 14A of the feeder 14 with the output impedance of 300Ω.
is electrically connected at another predetermined position.
A second terminal 6 is provided which is formed in a pattern having the following. A third terminal 7 is patterned slightly away from the connecting portion 6B of the second terminal 6 and in the forward direction into which the lead wire 14A of the feeder 14 having an output impedance of 300Ω is inserted. This third terminal 7 is electrically connected to the other end of the matching transformer 19. The matching transformer 19 is formed on the same plane or on the back side of the first terminal 5 to the third terminal 7, and its midpoint is electrically connected to the outer conductor connection terminal 2. In addition, the housing body 1
A coaxial cable with an output impedance of 75Ω is connected to the first terminal 5 to the third terminal 7 between the second terminal 6 and the third terminal 7 of the board 20 attached to one side of the board, and on the left side of the first terminal 5 in the figure. 13 center conductor 13B and a screw hole 8 for fixing the lead wires 14A and 14B of the feeder 14 with an output impedance of 300Ω.
is provided. A lead wire guide member 9 is placed on the first terminal 5 to the third terminal 7. This lead wire guide member 9 is made of an insulator, and has a groove 9A in the center approximately in the width direction into which the center conductor 13B of the 75Ω coaxial cable 13 is inserted, and furthermore, on the left and right sides of the groove 9A, Feeder 14 with output impedance 300Ω
Grooves 9B and 9C are provided into which lead wires 14B and 14A are inserted, respectively. The tongue pieces 9D, 9E for forming the grooves 9A, 9B, 9C of the lead wire guide member 9 are provided with a hole 10 through which a set screw 12 passes through, approximately at the center in the insertion direction of the coaxial cable 13. There is.

The center conductor 13B (FIG. 3) of the coaxial cable 13 having an output impedance of 75Ω or the lead wires 14A and 14B (FIG. 4) of the feeder 14 having an output impedance of 300Ω are connected to the first terminal 5 to the third terminal 7. A terminal connection holding member 11 made of a conductor for electrical connection and fixation is placed on the lead wire guide member 9 and fixed to the housing body 1 with a set screw 12. It's getting old.

In addition, as shown in FIG. 5, the center conductor 13B of the coaxial cable 13 with the output impedance of 75Ω
Alternatively, the lead wire 14A of the feeder 14 having an output impedance of 300Ω may be fixed to the housing body 1 using one terminal connection portion holding member 11 and one set screw 12, respectively.

In this embodiment configured as above,
A groove 9A into which the tip of the center conductor 13B of the coaxial cable 13 with an output impedance of 75Ω is inserted is provided at the center in the width direction of the lead wire guide member 9.
Groove 9 into which the tip of lead wire 14A of feeder 14 with output impedance of 300Ω is inserted on the left and right sides of
B, 9C are provided, and an output impedance is provided in parallel with the first terminal 5 patterned below.
A connecting portion 6A to which the center conductor 13B of the 75Ω coaxial cable 13 is electrically connected, and the other lead wire 14 of the feeder 14 having the output impedance of 300Ω.
Connection part 6 where A is electrically connected at another predetermined position
A second terminal 6 formed in a pattern having B is provided, and a front portion is provided which is a little apart from the connection portion 6B of the second terminal 6 and into which the lead wires 14A and 14B of the feeder 14 having an output impedance of 300Ω are inserted. By providing the third terminal 7 in the direction, the matching transformer 19 can be connected to the terminal part of the center conductor 13B of the coaxial cable 13 with an output impedance of 75Ω by attaching and detaching the lead wire 14B of the feeder 14 with an output impedance of 300Ω. It can be electrically connected and disconnected automatically. That is, when one lead wire 14A of the feeder 14 is connected to the third terminal 7 and the other lead wire 14B is connected to the first terminal 5, the third terminal 7 and the second terminal 6 are connected to one lead wire 14A. As a result, a short circuit occurs through the connection portion 6B, resulting in a state of use at 300Ω.

On the other hand, when the center conductor 13B of the coaxial cable 13 is connected to the second terminal 6, the second terminal 6 and the third terminal 7 are not short-circuited, so that the operating state is 75Ω.

This results in an output impedance of 75Ω.
The output impedance can be automatically switched between 75Ω and 300Ω without providing a cutout or switch for 300Ω switching and without increasing insertion loss. The output impedance can be automatically switched between 75Ω and 300Ω with low insertion loss without providing a cutting part or switch for switching between the output impedances of 75Ω and 300Ω.

[Embodiment] FIG. 6 is a perspective view showing the configuration of a main part of an embodiment in which the present invention is applied to a matching box for common television listening.

As shown in FIG. 6, the TV common listening matching box of this embodiment has the coaxial cable holding member 3 and each terminal connection holding member 11 of the embodiment shown in FIGS. 1 and 2 made of a transparent material. A holding member 15 integrally made of an insulator is provided, and the holding member 15 and one set screw 12 hold down the coaxial cable and each terminal connection part to electrically connect and mechanically fix it. It is.

With this configuration, it is possible to obtain the same effects as those of the previous embodiment, and since the pressing member 15 is transparent, the connection state of each connection part can be visually confirmed. .

[Embodiment] FIG. 7 is a perspective view showing the configuration of a main part of an embodiment in which the present invention is applied to a matching box for common television viewing.

As shown in FIG. 7, the TV common listening matching box of this embodiment is electrically connected to the coaxial cable and each terminal connection by holding down the holding member 15 of the embodiment shown in FIG. Instead of connecting and mechanically fixing, a hinge mechanism 16 and a locking mechanism 17 are provided on the holding member 15 to press the coaxial cable and each terminal connection part with one touch to electrically connect, mechanically fix, and operate. In addition to improving the performance, it is possible to obtain the same effects as those of the above embodiment.

[Embodiment] FIG. 8 is a plan view for explaining the configuration of a main part of an embodiment in which the present invention is applied to a matching box for common television listening.

As shown in FIG. 8, the TV common listening matching device of this embodiment is configured such that the holding member 11 of the embodiment shown in FIG. Before electrically connecting and mechanically fixing the output impedance to the terminal, the output impedance is
The lead wire 14B of the 300Ω feeder 14 is securely pressed to electrically connect and mechanically fix it.

With this configuration, it is possible to obtain the same effects as those of the embodiments described above.

[Embodiment] FIG. 9 is a plan view for explaining the configuration of a main part of an embodiment in which the present invention is applied to a matching box for common television listening.

As shown in FIG. 9, the TV common listening matching box of this embodiment has the following directions:
The direction in which the lead wire 14B of the feeder 14 with an output impedance of 300Ω is attached is bent by 90 degrees.

The lead wire 14A of the feeder 14 having an output impedance of 300Ω is structured so that it can be inserted from either the left or right side. Then, as in the previous embodiment, each terminal connection portion is electrically connected by pressing with a pressing member and mechanically fixed.

Although the present invention has been specifically explained above based on the embodiments, it goes without saying that the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways without departing from the gist thereof.

For example, in the above embodiment, the effect that the circuit operates when the third terminal is used (connecting a wire) is shown, but conversely, it is possible to transmit or inform others that the wire has been connected. Good too.

[Effect of idea]

As explained above, according to the present invention, the following effects can be obtained.

In the terminal connection device of the matching box for TV common listening,
Output impedance on one side of housing body 1
A connecting terminal 2 that connects the outer conductor of a 75Ω coaxial cable, a patterned second terminal 6 that is arranged in front of the connecting terminal 2 in the insertion direction of the coaxial cable and connects the center conductor of the coaxial cable, and A pattern is formed on both sides of the second terminal 6 and is connected between the first terminal 5 and the third terminal 7 to which the lead wire of the feeder having an output impedance of 300Ω is connected, and the first terminal 5 and the third terminal 7. A matching transformer 19 is provided, and connection portions are formed at predetermined intervals in front of the third terminal 7 to short-circuit the second terminal 6 and the third terminal 7 by the lead wire of the feeder wire inserted. and a groove disposed above the first terminal 5, second terminal 6, and third terminal 7 for guiding the center conductor of the coaxial cable and the pair of lead wires of the feeder wire. The guide member 9, the center conductor of the coaxial cable guided by the guide member 9, and the pair of lead wires of the feeder wire are connected to the first terminal 5, the second terminal 6, and the third terminal 7.
A holding member 11 is provided to press and fix the coaxial cable whose outer conductor is connected to the connection terminal 2, and a holding member 3 is used to press and fix the feeder wire to the one side of the housing body. Therefore, there is no need to provide a cut-off part or switch to change the output impedance between 75Ω and 300Ω, and without increasing insertion loss.
Output impedance can be automatically switched between 75Ω and 300Ω.

Furthermore, since the structure is such that the feeder wires and coaxial cables are connected only on one side of the housing body 1, when connecting a large number of feeder wires and coaxial cables in one place, it is possible to work efficiently on the same plane. Moreover, the appearance after connection will not be uneven and can be arranged in a good-looking state.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing the configuration of the main parts of an embodiment in which the present invention is applied to a matching box for common television listening, Fig. 2 is an assembled perspective view of Fig. 1, and Fig. 3 shows the output impedance. Plan view for explaining terminal connections when using a 75Ω coaxial cable, Part 4
The figure is a plan view for explaining terminal connection when using a feeder with an output impedance of 300Ω, and FIG. 5 shows an example in which the terminal holding member and set screw shown in FIG. 1 are fixed with one each. Figure 6 is a perspective view showing the configuration of the main part of an embodiment in which the present invention is applied to a matching box for common television listening;
The figure is a perspective view showing the configuration of the main part of an embodiment in which the present invention is applied to a matching box for common television listening.
The figure is a plan view for explaining the configuration of the main parts of an embodiment in which the present invention is applied to a matching box for common television listening. FIG. 2 is a plan view for explaining the configuration of main parts of an embodiment applied to the present invention. FIG. 10 to FIG. 12 are diagrams for explaining the problems of the conventional TV common listening matching device. In the figure, 1...Housing body, 2...Outer conductor connection terminal, 3...Coaxial cable holding member, 4, 1
2... Set screw, 5... First terminal, 6... Second terminal, 6A... Center conductor connection part, 6B... Lead wire connection part, 7... Third terminal, 8... Screw hole, 9 ……
Lead wire guide member, 9A, 9B, 9C... Lead wire insertion groove, 11... Terminal connection portion holding member, 13
... Coaxial cable, 13A ... Outer conductor, 13B
...Center conductor, 14...Feeder, 14A, 14
B... Lead wire, 15, 18... Pressing member, 16
...Hinge mechanism, 17...Lock mechanism, 19...
Matching transformer 20... is an output terminal.

Claims (1)

[Claims for Utility Model Registration] On one side of the housing body 1, there is a connecting terminal 2 for connecting the outer conductor of a coaxial cable with an output impedance of 75Ω, and the connecting terminal 2 is disposed in front of the coaxial cable in the insertion direction, and the coaxial cable is connected to the connecting terminal 2. A patterned second terminal 6 that connects the center conductor of the second terminal 6, and a first terminal 5 and a third terminal 7 that are patterned on both sides of the second terminal 6 and connect the feeder lead wire with an output impedance of 300Ω, These first terminals 5
and a matching transformer 19 connected between the third terminal 7 and the second terminal 6 and the third terminal 7. and a substrate on which connection parts for short-circuiting are formed at predetermined intervals, and further arranged above the first terminal 5, the second terminal 6, and the third terminal 7, and the center conductor of the coaxial cable,
A guide member 9 provided with a groove for guiding a pair of lead wires of the feeder wire, a center conductor of the coaxial cable guided by this guide member 9, and a pair of lead wires of the feeder wire are connected to the first terminal 5 and the second terminal. 6. A presser member 11 that presses and fixes the third terminal 7; and a presser member 3 that fixes the coaxial cable whose outer conductor is connected to the connection terminal 2 and presses and fixes the feeder wire to the one side of the housing body.
A terminal connection device for a matching box for common television viewing, characterized in that flat receiving portions are formed on both sides of the connection terminal to hold the feeder between the presser members 3.