JPS6021853Y2 - shielded cable - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to improvements in shielded cables.

In recent years, shielded cables having a structure in which the cable core is divided into eastbound and hundredbound lines using shielding tape have been used as cables for transmitting high-frequency signals such as television and telephone signals, or digital signals such as PCM.

FIG. 1 shows a cable commonly referred to as an S-type shielded cable.

In the figure, 10 is a core for the eastbound line, 20 is a core for the westbound line, and 30 is a core 10.20 that is divided and both ends are bent clockwise to partially surround the cores 10 and 20. This is a shielding tape.

This is provided with a shielding layer and a protective sheath (not shown).

In this type of cable, when the cable is bent, the ends of the metal tape used as shielding tape may damage the insulation of the cable core. A specially processed laminate tape with a so-called "edge treatment" is used, which is provided with a polyethylene layer 32 and further provided with a polyethylene layer so as to wrap both ends 311 and 312 of the metal tape.

However, such edge-treated laminate tapes are expensive because they require special processing, and the polyethylene layer at the tape ends may be damaged during tape transportation or cable manufacturing, resulting in metal parts being damaged. There was a problem in that it was difficult to handle because it was easily exposed.

The present invention was devised in view of the above, and provides a shielded cable that can prevent damage to the cable core even if a simple metal tape is used as the shielding tape, The line core is divided by a shielding tape, and a trauma prevention tape is vertically interposed between the end of the shielding tape and the core.

The present invention will be explained with reference to the drawings.

FIG. 3 is a sectional view of one embodiment of the present invention.

In the figure, 1 is a core for the eastbound line, 2 is a core for the westbound line, and 3 is a core for the westbound line. This is a shielding tape provided so as to partially surround parts 1 and 2.

Reference numerals 4 and 5 denote trauma prevention tapes interposed vertically between the ends 34 and 35 of the shielding tape and the wire cores 1 and 2, respectively.

A shielding layer and a protective sheath (not shown) are provided around the outer periphery of the structure of FIG. 3 to complete the cable.

The trauma prevention tape is lO~ depending on the cable size.
The width of the shielding tape should be about 6 mm, and the end of the shielding tape should be placed in the center.

The trauma prevention tape may be any material that is flexible and has a certain degree of strength; for example, a plastic tape such as polyethylene or polypropylene, or a paper tape such as kraft paper may be used.

As mentioned above, the shielded cable according to the present invention has trauma prevention tape interposed between the cable core and the end of the shielding tape.1 Even if a simple metal tape is used as the shielding tape, the end There is no risk of damaging the insulation of the wire core, and a shielded cable can be provided at a much lower cost than when using a conventional laminate tape treated with edges.

2. Compared to conventional methods, there is no need for special measures to prevent the metal part from being exposed from the end of the tape when transporting the shielding tape or manufacturing the cable, making it possible to manufacture shielded cables at low cost. Note that in the present invention, the shielding tape is not limited to a mere metal tape, and it goes without saying that various laminate tapes may be used as necessary.

Further, the structure of the shielding tape is not limited to that shown in FIG. 1, and any structure can be applied as long as the end of the shielding tape is in contact with the cable core when shielding a group of cable cores.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional shielded cable. Fig. 2 is a sectional view of a shielding tape that has undergone edge treatment. Fig. 3 is a sectional view of an embodiment of the shielded cable according to the present invention. Wire core for line line, 2... Wire core for line line, 3... Shielding tape, 4... Tape for preventing external damage.

Claims (1)

[Scope of utility model registration request] A shielded cable characterized in that the core for the eastbound line and the core for the westbound line are separated by a shielding tape, and a trauma prevention tape is vertically interposed between the end of the shielding tape and the core. .