JPH0533085Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Summary] In order to prevent broadcast waves from entering the main body of the telephone exchange, the outdoor line is used as an antenna between the subscriber circuit package and the subscriber line to cut off the broadcast waves that enter the system. Radio wave absorption component that passes audio waves (Common Mode Choke, hereinafter simply referred to as CMC)
It has been established.

[Industrial application field]

The present invention relates to a radio wave contamination prevention adapter for a telephone exchange, and more particularly to a radio wave contamination prevention adapter in which a CMC is interposed between a subscriber circuit package and a subscriber line.

In recent years, as the subscriber circuits of telephone lines have become more computerized, detection of broadcast waves has occurred, and the telephone signals spread inside and outside the telephone exchange building become antennas, allowing broadcast stations with strong electric field strength to be used. There is a phenomenon in which radio waves can be heard from subscriber's telephones in the vicinity.
Measures to cut off these radio waves are desired.

[Conventional technology]

Conventional telephone lines were structured to operate using relays using mechanical switches, so there was no risk of broadcast radio waves being mixed in.

[Problem that the invention attempts to solve]

However, in telephone exchanges that are computerized using high-speed digital signaling, the electronic circuit has the function of detecting broadcast waves, and there is a problem that, for example, radio broadcast waves can be picked up and radio waves can be heard on the telephone, disrupting the conversation. newly arose.

[Means for solving problems]

The present invention provides a radio wave interference prevention adapter that cuts off the input of radio waves in order to solve the above-mentioned problems.

As shown in Figs. 1, 2, and 3, the radio wave contamination prevention adapter (hereinafter referred to as CMC adapter) according to the present invention has a subscriber line 4 line on the upper half of the printed board 7 constituting the circuit board part. A plurality of radio wave absorbing components 5 (hereinafter referred to as CMC 5) provided corresponding to the number of radio wave absorbing components 5
At the same time, a plug connector 51 connected to the socket connector 2 on the subscriber circuit package 1 side and a subscriber line 4 are placed on the lower half of the printed circuit board 7.
The socket connectors 6 connected to the side plug connectors 41 are arranged back to back, and the
An input side connection line 11 connecting the CMC 5 and the plug connector 51 and a connection line 13 connecting each CMC 5 and the socket connector 6 are arranged separately on the front side and the back side of the printed board 7. In addition, these input side connection wires 1
1 and the output side connection line 13 are configured so that the line lengths thereof are equal to each other.

[Effect]

The CMC adapter 3 prevents radio broadcast waves from being mixed in by interposing a CMC 5 between the electronic circuit package and the subscriber line, which cuts out radio waves such as radio broadcast waves and allows only telephone audio to pass through.

〔Example〕

Figures 2a to 2f are diagrams illustrating an embodiment of the CMC adapter of the present invention, in which Figure 2a is a plan view of the board, Figure 2b is a plan view of the entire CMC adapter,
Figure 2c is a right side view, Figure 2d is a left side view,
Fig. e is an exploded perspective view of the CMC adapter, and Fig. 2 f is a perspective view of the cable connector, in which the same parts as in Fig. 1 are given the same reference numerals.

In the figure, a notch 71 is formed in a part of a printed board 7 made of glass epoxy resin, etc., and a plurality of CMCs 5, which cut out a plurality of radio broadcast waves, etc., and pass only audio waves, are formed in a part A without a cutout. A large number of male contact pins 8 are press-fitted into the part B where the notch 71 is not formed, and the cable connector receiver 15 and plug connector 51 made of an insulating material are attached as shown in FIG. 2e. The integrally formed mounting bracket 9 to be attached is screwed onto the printed board 7 with a tightening screw 12. A cable connector receiver 15 shown in FIG. 2e is attached to the mounting bracket 9 on the B side to which a large number of male contact pins 8 are attached and to which the socket connector 6 is connected. Also, the notch 7
A connector mounting bracket 10 having a protrusion 101 fitted into a notch 511 of a plug connector 51 is attached to the first mounting bracket 9 and is screwed with a tightening screw 12.
Then, connect the male contact pin 8 and one terminal (input side) of the CMC 5 with the connecting wire 11, and connect the CMC
The other terminal (output side) of 5 is connected to a cable connector 16 via a connecting wire 13.

By making the distance between the input-side connection line 11 and the output-side connection line 13 as far as possible, electrical coupling between the input and output lines can be reduced, and the noise reduction effect can be increased. In the present invention, the connection wire 11 on the input side uses the surface of the printed board 7 opposite to the side on which the CMC 5 is mounted, and the connection wire 13 on the output side uses the surface opposite to the above, so that the distance between the connection wires is increased. There is.

The male contact pin 8 is connected to the plug connector 51 described in FIG. 1, and the plug connector 51 is inserted into the socket connector 2.

FIG. 3 is a schematic configuration diagram of an example of implementation of the CMC adapter of the present invention, in which parts equivalent to those in FIG. 1 are given the same reference numerals.

In the figure, the CMC adapter 3 explained in FIG. If the connector 41 is connected, the first
As explained in the figure, if radio broadcast waves are mixed in the call voice from subscriber line 4, CMC5
By passing through the plug connector 51, the radio broadcast waves are cut off, but the voice of the call passes through without any problem.
to the socket connector 2 of the electronic circuit package 1.

In the above embodiment, the components other than the CMC 5, printed board 7, and mounting bracket 9 can be constructed by combining existing parts, which is superior in terms of cost and reliability, and improves manufacturability by minimizing the number of parts. We can provide an excellent adapter in terms of.

[Effect of idea]

As is clear from the above explanation, according to the present invention, even if radio broadcast waves etc. enter the subscriber line,
Since only the voice of the call is input to the exchange after being cut by the CMC, it is extremely effective in improving the reliability of call characteristics. In areas and cases where there is no risk of such contamination of broadcast waves, etc., it is sufficient to connect the plug connector 41 of the subscriber line to the socket connector 2, and if there is a risk of interference, the present invention can be used.
It is easy to handle as it is only necessary to insert a CMC adapter.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram explaining the principle of the present invention, and FIGS. 2 a to 2 f are diagrams explaining one embodiment of the CMC adapter of the present invention, in which figure a is a plan view of the board, and b is a plan view, c is a right side view, d is a left side view,
e is an exploded perspective view, f is a perspective view of a cable connector, and FIG. 3 is a schematic configuration diagram of an example of mounting the CMC adapter of the present invention. In the figure, 1 is an electronic circuit package, 2, 6
is a socket connector, 3 is a CMC adapter, 4 is a subscriber line, 5 is a CMC, 7 is a printed board, 8 is a male contact pin, 9 is a mounting bracket, 10 is a connector mounting bracket, 11 and 13 are connection wires, 12 14 is a tightening screw, 14 is a back board, 15 is a cable connector receiver, 16 is a cable connector, 41 and 51 are plug connectors, 71 is a notch, 101 is a protrusion, and 511 is a notch.

Claims (1)

[Scope of Claim for Utility Model Registration] A radio wave contamination prevention adapter provided between a subscriber line 4 and a subscriber circuit package 1 in order to prevent broadcast radio waves etc. from contaminating a telephone exchange, which constitutes a circuit board part. A plurality of radio wave absorbing components 5 corresponding to the number of lines of the subscriber line 4 are arranged on the upper half of the printed board 7, and the solenoid of the subscriber circuit package 1 is arranged on the lower half of the printed board 7. A plug connector 51 connected to the socket connector 2 and a socket connector 6 connected to the plug connector 41 on the subscriber line 4 side are respectively arranged back to back, and each of the radio wave absorbing parts 5 and the plug connector 5
1, and an output side connection line 13, which connects each radio wave absorbing component 5 and the socket connector 6, are arranged separately on the front side and the back side of the printed board 7. An adapter for preventing radio wave contamination, characterized in that the input side connecting line 11 and the output side connecting line 13 are configured to have equal line lengths.