JPH09185913A - Shielding cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a shielding cable easily bendable and also high in durability, by laterally winding or longitudinally attaching a tapelike conductor provided with a slit, to constitute a shielding layer. SOLUTION: Single or plural central conductors 1 are coated with an insulator 2, to laterally wind a tapelike external conductor 3 on the outer periphery of the insulator 2 to constitute a shielding layer. The external conductor 3 is laminated with the thin coat of proper conductive metal such as aluminium or copper, and a synthetic resin coat rich in flexibility such as PET, to be molded into a long size tape state. Plural slits 4 are provided which are penetrating from the surface to back surface of the external conductor 3 and also being intermittent in the longitudinal direction of the external conductor 3. A shielding cable, easily bent and also high in durability, can be obtained by thus laterally winding or longitudinally attaching a tapelike conductor provided with a slit, to constitute the shielding layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shielded cable for electronic equipment or communication, and more particularly to a shielded cable in which a tape-shaped conductor is used as a shield layer and the bending resistance is improved.

[0002]

2. Description of the Related Art Conventionally, a shielded cable using a tape-shaped conductor as a shield layer has been used as an interface cable for information processing equipment. FIG. 4 is an exploded perspective view of a shielded cable in which a conventional tape-shaped conductor is wound horizontally to form a shield layer. An insulating body 2 is coated around a central conductor 1 made of one or more annealed copper wires, and a tape-shaped conductor 13 is wound around the outer periphery of the insulating body 2 to form a shielding layer.

The tape-shaped conductor 13 is usually formed by laminating a thin film of a good conductive metal such as aluminum or copper and a flexible synthetic resin film such as polyethylene terephthalate (hereinafter abbreviated as PET) to form a long strip. It is formed into a tape.

FIG. 5 is an exploded perspective view of a shielded cable in which a shield layer is formed by vertically attaching a conventional tape-shaped conductor.
A single or plural central conductors 1 are covered with an insulator 2, and a tape-shaped conductor 15 is vertically provided on the outer periphery of the insulator 2 to form a shielding layer. The tape-shaped conductor 15 is also shown in FIG.
The metal thin film and the synthetic resin film are laminated in the same structure as the tape-shaped conductor 13 of FIG.

[0005]

However, the above-mentioned conventional shielded cable has no endurance against repeated bending, and when used for connecting a movable input device such as a mouse and a computer main unit, The shielded cable is repeatedly bent along with the movement, and there is a problem that the shielding layer is broken by the stress of this bending and the shielding effect is lost.

In view of the above problems, an object of the present invention is to provide a shielded cable which uses a tape-shaped conductor as a shield layer to improve the bending resistance of the cable and does not cut the shield layer even when repeatedly bent. That is.

[0007]

In order to solve the above problems, the present invention has the following arrangement. That is, the invention according to claim 1 is a shielded cable in which a tape-shaped conductor is wound horizontally or vertically around an outer periphery of an insulator provided on the outer periphery of a central conductor to form a shielding layer, and a slit is formed in the tape-shaped conductor. The main point is the provision.

Further, the invention according to claim 2 is a shielded cable in which a tape-shaped conductor is wound horizontally or vertically around an outer periphery of an insulator in which a plurality of center conductors are spaced apart from each other and embedded to form a shield layer, The gist is that a slit is provided in the tape-shaped conductor.

According to a third aspect of the present invention, in the shielded cable according to the first or second aspect, the plurality of slits parallel to each other are provided intermittently in the longitudinal direction of the tape-shaped conductor. Use as a summary.

The invention according to claim 4 is the shielded cable according to claim 1 or 2, wherein the plurality of slits parallel to each other are provided in a direction intersecting the longitudinal direction of the tape-shaped conductor. Is the gist.

The invention according to claim 5 is the shielded cable according to any one of claims 1 to 4, wherein a plurality of slits adjacent to each other are grouped in the slit, and each slit is grouped. The gist is that the slits are discontinuous and the discontinuous positions of the slits are different between the adjacent groups.

With the above-described structure, the shielded cable according to the present invention has a slit provided in the tape-shaped conductor which constitutes the shielding layer opened when bending is applied, so that the stress due to bending can be released, so that the shielding layer is not excessively stressed. Stress does not act,
The shield layer is not cut, and the durability of the cable is increased.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view illustrating a first embodiment of a shielded cable according to the present invention. FIG. 1A shows a single-core shielded cable as shown in FIG.
Indicates a multi-core shielded cable, in which a single or a plurality of central conductors 1 are covered with an insulator 2, and a tape-shaped outer conductor 3 is wound around the outer periphery of the insulator 2 to form a shield layer. . The outer conductor 3 is formed by laminating a thin film of a highly conductive metal such as aluminum or copper and a highly flexible synthetic resin film such as PET and molding it into a long tape shape.
A plurality of slits 4 are provided that penetrate from the front surface to the back surface of the outer conductor 3 and that are interrupted in the longitudinal direction thereof.

FIG. 2 shows a second part of the shielded cable according to the present invention.
FIG. 3 is an exploded perspective view illustrating the embodiment of FIG. FIG. 2 (a)
2 shows a single-core shielded cable, and FIG. 2B shows a multi-conductor shielded cable.
Is covered with an insulator 2, and a tape-shaped outer conductor 5 is provided on the outer periphery of the insulator 2 to form a vertically attached shield layer. The outer conductor 5 is also formed by laminating a metal thin film and a synthetic resin film into a long tape shape by the same structure as that of the outer conductor 3 of the first embodiment. A slit 4 is provided.

FIG. 3 shows various modifications of the slits provided in the tape-shaped conductor. FIG. 3A shows an example of slits when the tape-shaped conductor is wound in a horizontal direction to form a shielding layer. A plurality of slits are provided in parallel in the longitudinal direction of the tape-shaped conductor and the slits are intermittently formed in the longitudinal direction. Thus, the connecting portion without slits is provided at regular intervals. By providing this connecting portion, workability equivalent to that of the conventional shielded cable can be ensured in the step of winding the tape-shaped conductor around the insulator in a horizontal direction. Further, as shown in FIG. 3B, the slit may be divided into a plurality of groups, and the connecting portions of each group may be arranged in a staggered manner.

FIG. 3C shows an example of slits in the case of forming a shielding layer by vertically arranging tape-shaped conductors, and a plurality of slits are provided at right angles to the longitudinal direction of the tape-shaped conductors. The slits may be spaced at equal intervals, or may be spaced apart from one group of slits and another group of slits as shown in FIG. Further, as shown in FIG. 3D, the slits may be interrupted in the longitudinal direction of the slit itself to provide a connecting portion of the tape-shaped conductor, and as shown in FIG. 3E, a plurality of adjacent slits may be provided. May be grouped, and the positions where the slits are interrupted between the groups may be arranged in a staggered manner.

Further, as shown in FIG. 3 (f), slits may be provided at an angle to the longitudinal direction of the tape-shaped conductor. The angle of the slit may be an angle at which the slit is perpendicular to the cable longitudinal direction when the tape-shaped conductor is wound around the insulator 2 in a horizontal direction.

[0018]

As described above, according to the present invention, the shielded layer is formed by winding the tape-shaped conductors provided with slits in a horizontal direction or vertically so that the shielded cable can be easily bent and has high durability. Can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view illustrating a first embodiment (horizontal winding) of a shielded cable according to the present invention.

FIG. 2 is an exploded perspective view for explaining a second embodiment (longitudinal addition) of the shielded cable according to the present invention.

FIG. 3 is a diagram showing an example of slits provided in a tape-shaped conductor.

FIG. 4 is an exploded perspective view showing a structural example (horizontal winding) of a conventional shielded cable.

FIG. 5 is an exploded perspective view showing a structural example (longitudinal addition) of a conventional shielded cable.

[Explanation of symbols]

 1 conductor 2 insulator 3 tape-shaped conductor 4 slit

Claims (5)

[Claims] 1. A shielded cable in which a tape-shaped conductor is horizontally wound or vertically attached to the outer periphery of an insulator provided on the outer periphery of a central conductor to form a shield layer, wherein a slit is provided in the tape-shaped conductor. And shielded cable. 2. A shielded cable in which a tape-shaped conductor is horizontally wound or vertically attached to the outer periphery of an insulator in which a plurality of center conductors are spaced apart from each other and embedded to form a shield layer, and a slit is provided in the tape-shaped conductor. Shielded cable characterized by 3. The shielded cable according to claim 1, wherein the plurality of slits parallel to each other are provided intermittently in the longitudinal direction of the tape-shaped conductor. 4. The shielded cable according to claim 1, wherein the plurality of slits that are parallel to each other are provided in a direction intersecting a longitudinal direction of the tape-shaped conductor. 5. The slit is characterized in that a plurality of slits adjacent to each other are grouped, the slits are interrupted for each group, and the interrupted positions of the slits are different between adjacent groups. The shielded cable according to any one of claims 1 to 4.