JPH045030Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an input/output device for a cable tester, and particularly to an input/output device having a relay.

[Conventional technology]

In recent years, as communication/transmission networks have become more sophisticated, multi-core cables 3 having a large number of core wires 1, as shown in Figure 4, have come into widespread use, but from the perspective of ensuring reliable transmission conditions. There is a strong demand for high insulation resistance characteristics and high voltage resistance characteristics between each core wire 1 of the multicore cable 3.

Furthermore, as the number of core wires 1 increases, it becomes more complicated to check the correspondence between each core wire 1 at both ends of the cable 3.

Cable tester A has come to be provided as a device for testing various characteristics of the cable 3 and checking the correspondence between the core wires 1.
The condition of the cable 3 is now tested by connecting the input and output ends of a cable tester between both ends of the core wire 1.

The input/output device in the cable tester A often uses a relay to switch input or output signals, and conventionally, the mounting structure of the relay has been as shown in FIG. 5.

That is, an insertion hole 9 passing through the circuit pattern 5 is formed through the circuit board 7 on which the circuit pattern 5 which is a part of the input or output circuit is formed, and the terminal pin 13 of the relay 11 for switching the input or output circuit is inserted into the insertion hole. 9, the terminal pins 13 are connected to the circuit pattern 5 with solder 15, and the relay 11 is attached to the circuit board 7.

[Problem that the invention attempts to solve]

However, in the input/output device of such a cable tester, the terminal pin 13 of the relay 11 is soldered to the circuit pattern 5, so the insertion hole 9 is
It is necessary to make the inner diameter of the insertion hole 9 slightly larger than the outer diameter of the terminal pin 13, and to make the inner diameter of the insertion hole 9 as small as possible.

As a result, the terminal pin 13 of the relay 11 comes into contact with the circuit board 7 or comes very close to it, so the insulation resistance at the terminal pin 13 portion tends to be small, and when looking at the cable 3, which is the object to be measured, from the cable tester. There is a drawback that the insulation resistance becomes low and the measurement results tend to be inaccurate. Furthermore, there is a possibility that the insulation resistance may change depending on the material of the circuit board 7.

For example, if the environmental humidity of the input/output device of a cable tester using a glass epoxy board as the circuit board 7 is increased by 85% in terms of relative humidity, the insulation resistance will increase.
It has been confirmed that the resistance decreases to less than 100MΩ.
The main body resistance of about 1500MΩ is extremely deteriorated.

The present invention was developed in view of the above situation, and its object is to provide an input/output device for a cable tester that can maintain high insulation resistance at the terminal pin portion of a relay.

[Means for solving problems]

In order to solve this problem, the present invention proposes a relay 2 for switching the input or output circuit B of the cable tester, as shown in FIGS. 1 and 2.
1 and 25 are attached to a circuit board 35 having at least its input/output circuit B. Moreover, the relay 2 is connected to the input/output circuit B.
Terminal pins 23a to 23c provided on 1 and 25,
Through holes 37a to 37c, 39a, 39b, 41a, 4 with a larger diameter than 27a, 27b, 29a, 29b
1b is formed on the circuit board 35, and its insertion hole 37a
~37c, 39a, 39b, 41a, 41b with terminal pins 23a~23c, 27a, 27b, 29
a, 29b with some play without contacting the circuit board 35, and then attach the relays 21, 25 to the circuit board 35, and then connect the terminal pins 23 to 23c, 27a,
27b, 29a, 29b and input/output circuit B are connected by connection wires 43a to 43e.

[Effect]

The present invention having such means has the circuit board 3
Terminal pins 23a of relays 21 and 25 attached to
Since the terminal pins 23a to 23c, 27a, 27b,
The insulation resistance at the portions 29a and 29b becomes high, and the insulation resistance is unlikely to vary depending on the material of the circuit board 35.

〔Example〕

Examples of the present invention will be described below.

Figures 1 and 2 show the cable and cable according to the present invention.
1 is a cross-sectional view and a plan view showing one embodiment of an input/output device of a tester. For convenience, first, an outline of an input/output circuit of a cable tester in which the input/output device of the present invention is used will be described.

FIG. 3 shows the input/output circuit B of the cable tester.

In the figure, the output of the signal generating circuit 17 that outputs the test signal is connected to the signal receiving circuit 19 and one fixed terminal 23a of the single-circuit multi-contact type relay 21, and the other fixed terminal 23b is connected to a negative potential. has been done.

The movable terminal 23c of the relay 21 is connected to the fixed terminal 27a of one switch circuit in the two-circuit single contact type relay 25, and the movable terminal 27b is connected to the movable terminal 29a of the other switch circuit and the external connection terminal 31. A positive potential is connected to the fixed terminal 29b.

When the movable terminal 23c and the fixed terminal 23a are connected in the relay 21, the movable terminal 27b and the fixed terminal 27a are connected in the relay 25, and the movable terminal 29a is open, the signal from the signal generation circuit 17 is is output to the external connection terminal 31, and the signal from the external connection terminal 31 can be input to the signal reception circuit 19 when the signal generation circuit 17 is in the OFF state. On the other hand, relay 21,
When the switch 25 switches, another signal can be output to the external connection terminal 31.

The present invention is particularly characterized by the structure of the relays 21 and 25 in the input/output circuit B.

That is, in FIGS. 1 and 2, the circuit board 35 on which the circuit pattern 33, which is part of the input/output circuit B, is formed has the above-mentioned relay 21,
A plurality of terminal pins 23a to 23 protruding from 25
Through holes 37a to 37c, 39a, 39b, 41 at the same pitch as c, 27a, 27b, 29a, 29b
a, 41b are formed through. This insertion hole 3
7a-37c, 39a, 39b, 41a, 41b
are terminal pins 23a to 23c, 27a, 27b,
It is formed larger than the outer diameter of 29a and 29b. In order to simplify understanding, each terminal of the relays 21 and 25 in FIG. 3 and the terminal pins in FIGS. 1 and 2 are indicated by the same reference numerals.

Relays 21 and 25 have terminal pins 23a to 23
c, 27a, 27b, 29a, 29b through the insertion holes 37a to 37c, 39a, 39b, 41a,
The terminal pins 23a to 23c, 27a, 2 are inserted into the circuit board 35 so as to be located approximately in the center of the terminal pin 41b, and are attached to the circuit board 35, and protrude from the back surface of the circuit board 35.
7b, 29a, and 29b, the core wires of insulation-coated connection wires 43a to 43e are twisted and connected by soldering. Illustration of solder is omitted.

And the insertion holes 37a to 37c, 39a, 39
The inner diameter T ₁ of b, 41a, 41b is the terminal pin 23
The diameter is sufficiently larger than the outer diameter T ₂ of a to 23c, 27a, 27b, 29a, and 29b, and further,
Terminal pins 23a to 23c, 27a, 27b, 29
The core wires 45a to 45c of the connection wires 43a to 43c are twisted around the cores 45a to 45c of the connection wires 43a to 43c and connected to the terminals _{a and} 29b by soldering.
Therefore, the terminal pins 23a to 23c, 27a, 27
b, 29a, 29b have enough play to insert through hole 3.
7a-37c, 39a, 39b, 41a, 41b
is inserted into.

Some of the connection wires 43a to 43e are connected to terminal pins 2 of the relay 25.
9b to the circuit pattern 33 and soldered thereto, and the connecting wire 43d, which is connected to another terminal pin 29a, extends to the surface side of the circuit board 35 through an insertion hole 45 formed in the circuit board 35, and is connected to the other terminal pin 29a. External connection terminal 3 of a printed wiring connector 47 as a connection means attached to the front end of 35
1 is soldered and connected.

As described above, these relays 21 and 25 have conventionally known structures such as a single circuit multiple contact configuration or a two circuit single contact configuration, and the terminal pins 23a to 23 described above
In addition to 23c, 27a, 27b, 29a, and 29b, drive terminal pin 49 is not connected to input/output circuit B.
a, 49b, 51a, 51b, and the circuit board 3
5 through holes 53a, 53b, 55a,
55b. Note that this insertion hole 53
Similar to the conventional example, pins a, 53b, 55a, and 55b have dimensions slightly larger than the outer dimensions of the drive terminal pins 49a, 49b, 51a, and 51b, and are arranged so as to face the insertion holes 53a, 53b, 55a, and 55b. A drive circuit 57a formed on the circuit board 35,
57b by soldering.

The input/output device of the cable tester configured in this way includes the terminal pins 23a of the relays 21 and 25.
23c, 27a, 27b, 29a, 29b and the circuit board 35, so that the terminal pins 23a to 23c, 27a, 27b, 2
It becomes possible to maintain an extremely high insulation resistance in the portions 9a and 29b, and the insulation resistance is unlikely to change depending on the material of the circuit board 35.

The applicant has provided a terminal pin 2 with an outer diameter of approximately 0.8 to 0.9 mm.
3a-23c, 27a, 27b, 29a, 29b
is the inner diameter provided on the glass epoxy circuit board 35.
Insertion holes 37a to 37c, 39a, 3 of about 3.5mm
When an experiment was conducted by inserting it into the center of 9b, 41a, and 41b and relatively increasing the humidity by 85%, it was possible to maintain an insulation resistance of 1500 MΩ or more in input/output circuit B.

The embodiment of the present invention described above was an example of a circuit configuration in which the input circuit and the output circuit were combined, but the input/output device of the cable tester of the present invention is the input circuit or the output circuit of the cable tester. The input circuit or the output circuit is not limited to the above-mentioned circuit configuration and can be implemented in any of the above. The number of relays is also free.

In addition, the relays 21, 25 and the connecting wire 43a
43e are electronic components and circuit patterns that constitute the input/output circuit B of the cable tester, such as the circuit pattern 33 and the printed wiring connector 59, as described above.

[Effect of idea]

As explained above, the input/output device of the cable tester of the present invention involves inserting the terminal pin of the relay into the insertion hole with some play without contacting the circuit board, and connecting the terminal pin and the input/output circuit with the connecting wire. Because of this connection, the insulation resistance at the terminal pin portion of the relay attached to the circuit board can be maintained extremely high.

Therefore, when the cable to be measured is viewed from the input/output device of the cable tester, the insulation resistance is high and accurate testing can be ensured.

In particular, the effect of the present invention is remarkable when the insertion hole is formed to have a diameter sufficiently larger than the outer diameter of the connecting portion between the connecting wire and the terminal pin.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views (second
Figure 3 is a circuit diagram showing an example of the input/output circuit of a cable tester, Figure 4 is a schematic diagram showing an example of a cable, and Figure 5 is a conventional cable tester. FIG. 2 is a cross-sectional view showing an outline of the input/output device of the tester. 1... Core wire, 3... Cable, 5, 33... Circuit pattern, 7, 35... Circuit board, 9, 37a
~37c, 39a, 39b, 41a, 41b...
Insertion hole, 11, 21, 25... Relay, 13, 2
3a-23c, 27a, 27b, 29a, 29b
...Terminal pin, 27...Connection wire, 43a~
43e... Connection wire, 47... Connector for printed wiring, A... Cable tester, B... Input or output circuit (input/output circuit).

Claims (1)

[Claims for Utility Model Registration] (1) A relay that switches the input or output circuit of a cable tester that inspects the condition of cables, and a terminal pin that is connected to the input or output circuit and has a larger diameter than the terminal pin provided on the relay. A circuit board having an insertion hole and at least the input or output circuit, wherein the terminal pin is inserted into the insertion hole with play without contacting the circuit board, and the relay is attached to the circuit board. , a connection wire connecting the terminal pin and the input/output circuit, and an input/output device for a cable tester. (2) The input/output device for a cable tester according to claim 1, wherein the insertion hole is formed to have a diameter sufficiently larger than the outer diameter of the connection portion between the connection wire and the terminal pin.