JPS6031129Y2 - Shielded cable for signal transmission - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a shielded signal transmission cable used for wiring inside a computer.

Shielded signal transmission cables used for computer wiring receive not only high frequency induction but also low frequency induction from a computer power supply with a low frequency of about 400 Hz.

Electrostatic shielding is effective for high-frequency induction, but since low-frequency induction is electromagnetic induction, it must be electromagnetic shielded, so the above-mentioned signal transmission shielded cable requires both types of shielding means.

Conventional shielding means for shielded signal transmission cables consisted of a conductive tape wrapped over each pair and a magnetic tape wrapped on top of the conductive tape, which resulted in a larger outer diameter and less flexibility. , and the conductive tape must be connected to the ground wire,
For this reason, there was a drawback that workability during wiring was low.

An object of the present invention is to provide a shielded cable for signal transmission that has a small outer diameter, is highly flexible, and can be easily grounded.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a shielded cable 10 for signal transmission according to the present invention, and this shielded cable is separated from an aggregate of a plurality of pairs 12.

Each pair 12 is formed by twisting together two insulated conductive wires 14,14'.

Each pair 12 has shielding means 16, which shielding means:
As shown in FIG. 2, two insulated conductive wires 14 forming a pair
．． 14' and a bare conductor 18, such as an uninsulated copper wire, twisted together with the insulated conductor 14; 14' and the bare conductor 1;
The magnetic tape 20, such as iron tape, is wrapped over the twisted body of the magnetic tape 8 and the magnetic tape 20.

Electrostatic shielding is achieved by the conductivity of the conductive wire 18, which is a good conductor, and the slight conductivity of the magnetic tape 20 that comes into contact with it and surrounds the insulated conductive wires 14, 14'. This is done with a magnetic permeability of 20.

The conductor wire 18 is twisted together when the insulated conductor wires 14 and 14' constituting the pair are twisted together to form the pair 12, but as can be seen from FIG. The diameter does not increase, and the conducting wire 18 can be used as it is as a grounding wire.

According to the present invention, as described above, the electromagnetic shielding means is shielded from uninsulated conductors twisted together with the two insulated conductors constituting the pair, so compared to the conventional wrapping of conductive tape. This allows the outer diameter of the cable to be small, does not impair the flexibility of the cable, and allows the uninsulated conductor to be used as a grounding wire, making wiring work more efficient. Furthermore, since there is no need for the process of winding the conductive tape, there is the practical benefit of good workability and low cost manufacturing.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a shielded cable for signal transmission according to the present invention, and FIG. 2 is an enlarged cross-sectional view of one pair. 10... Shielded cable for signal transmission, 12...
...Pair, 14.14'...Insulated conductor wire, 16.
...shielding means, 18 ... uninsulated bare conductor, 20 ... magnetic tape.

Claims (1)

[Scope of utility model registration request] A shielded cable for signal transmission consisting of an aggregate of a plurality of pairs, each pair having a shielding means, wherein the shielding means connects an uninsulated conductor wire twisted together with two insulated conductors constituting the pair, and the insulation of the uninsulated conductor wire. A shielded cable for signal transmission, characterized in that it is cut from a magnetic tape wrapped over a twisted combination of a conducting wire and an uninsulated conducting wire.