JPS59165310A - Cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cable that is effective in reducing noise.

Conventionally, various noise reduction measures have been taken when transmitting signals using cables. FIG. 1 shows the case where no measures are taken, where l is a transmitting side circuit, 2 is a receiving side circuit, and 3 is a single cable. Next, a typical first method for noise reduction is shown in FIGS. 2 and 3. In Fig. 2, the method using twisted cable 4 is used between 1 and 2, and in Fig. 3, the method uses twist cable 4 between 1 and 2.
2 shows a method using a shielded cable 5, both of which reduce external noise. Figure 4 shows
This shows the second noise reduction method. By adding a capacitor near the connection with the cable on the transmitting side 1 and the receiving side 2, high frequency noise included on the transmitting side can be reduced.
It also shows how to use a capacitor to remove noise induced into the cable from the outside.

However, with the first method, it is not possible to eliminate high frequency noise already included in the signal from the transmitting side and noise such as high frequency components resulting from impedance mismatch at both ends of the cable. On the other hand, in the second method, although the capacitor is effective in reducing these noises, compared to the first method, the reduction in external noise is insufficient. As mentioned above, both methods have their own drawbacks, so a method of combining the two methods has also been adopted. However, since a capacitor is required, if a capacitor is added to each C1 for many signal lines, the number of components increases, which is an economical drawback.

In the structure of a conventional shielded cable, the present invention replaces the insulator between the central conductor portion that transmits signals and the ninth outer conductor portion of the shield with a dielectric material having a predetermined high dielectric constant. This is equivalent to distributing capacitors, and in addition to the conventional shielding effect, the present invention aims to provide a new cape A that aims to eliminate high-frequency noise components present in signals.

That is, the present invention provides a cable characterized by a structure in which a conductor wire is covered with a dielectric material having a predetermined high dielectric constant, the surrounding area is further covered with a conductor, and the wire is covered with an insulator, and these cables are made into a flat plate. The present invention provides a flat cable having the feature that a plurality of flat cables are integrated into an integrated structure.

Next, embodiments of the present invention will be described with reference to the drawings.

Fig. 5 shows the structure of a cable as a first embodiment of the non-explosion device, where 7 is a conductor for transmitting signals, and 8 is a conductor for transmitting signals.
is a conductor for shielding the signal flowing through the conductor 7 from the outside, and a dielectric material 9 having a predetermined high dielectric constant is inserted between the conductor 7 and the conductor 7.
However, these are coated with an insulator IO. The difference from conventional shielded cables is that the dielectric 9 is made of a dielectric instead of an insulator. When conductor 8 is exposed to the ground and signals are transmitted through conductor 7, noise from the outside can be sufficiently reduced because the conductor 8 is shielded from the outside as in conventional shielded cables. or,
The portion indicated by the dielectric material 9 is a dielectric material having a predetermined high dielectric constant, and is present in a predetermined distribution between the conductors 7° and 8, so that this portion constitutes a capacitor. As a result, there is an effect of reducing noise such as a high frequency noise component included in a signal and a high frequency component resulting from impedance mismatch at both ends of the cable. Furthermore, since there is no need to attach a capacitor to the outside of the cable, there is an advantage in terms of component mounting.

FIG. 6 shows the structure of a flat cable as a second embodiment of the present invention. 11, 12, 13 are conductors for transmitting signals, and 14, 15, 16 are conductors for shielding the signals flowing through each conductor 11, 12, 13 from the outside by exposing them to the ground. Conductor, 1
5,16. I is a dielectric material having a predetermined high dielectric constant, and 18 is an insulator. This flat cable is the fifth
The cable shown in the figure is an integrated structure in which a plurality of cables are grouped together in a flat plate shape.Since the signals flowing through the conductors 11, 12, and 13 are shielded from the outside, noise from the outside of the cable is eliminated. It is not affected by signals flowing through other conductors. In addition, like the cable shown in Fig. 5, the dielectric material with a predetermined high dielectric constant has the effect of eliminating high frequency noise, and each conductor i of 11° 12.13 is connected to the signal line flowing through it. Since there is no need to mount each capacitor, there is a great economical and mounting effect of reducing the number of parts.

Unexploded FIA-r: As explained above, in the conventional shielded cable structure, the provided cable has a predetermined insulation between the central conductor part that transmits the signal and the outer conductor part for shielding. Since the structure is replaced with a dielectric material having a high dielectric constant, in addition to the conventional shielding effect, it has the effect of removing high frequency noise components included in the signal.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram when sending signals using a single cable.
Figures 2 and 3 are configuration diagrams for transmitting signals using twisted cables and shielded cables, respectively, as examples of the first method for conventional noise reduction, and Figure 4 is an example of the second method. FIG. 5 is a block diagram showing the structure of a cable in the present invention, and FIG. 6 is a block diagram showing the structure of a flat cable in the present invention. 1...Par transmitting side circuit, 2...Receiving side circuit, 3...Single cable, 4...Twisted cable, 5...Shield cable, 6
...Noise removal capacitor, 7, 8, 11.1
2,13.14.15゜16...Conductor, 9,1
5,16.17...dielectric, 10.18...
···Insulator. 2 times * 3 times cold 77-v beef side 6TiJ

Claims (1)

[Claims] A cable characterized in that it has a structure in which a conductor wire is covered with a dielectric material having a predetermined high dielectric constant, the periphery of the conductor wire is further covered with a conductor, and the wire is covered with an insulator.