JPH06243732A - Shielded cable - Google Patents

Abstract

PURPOSE:To narrow the diameter of a shielded cable to reduce weight, and to improve the heat resistance and the radiation resistance thereof remarkably by forming a layer, which works as both of a shield and a jacket of a cable, of aluminum/polyimide tape obtained by laminating a polyimide layer on an aluminum layer. CONSTITUTION:The periphery of an insulating body (high polymer insulating layer: fluororesin) provided on a conductor 1 as a core of an insulator wire is coated with a shield and jacket to form a shielded cable. In this shielded cable, a layer working as both of a shield and a jacket is formed of aluminum/ polyimide tape 3, which is obtained by laminating a polyimide layer on an aluminum layer. The tape 3 having the excellent heat resistance and radiation resistance works as both of a shield and a jacket to narrow the diameter of a shielded cable and lighten it, and the heat resistance and the radiation resistance are improved remarkably. A drain wire 4 is used to facilitate the connecting work and the grounding work of wires, and the tape 3, which is obtained by unifying an aluminum layer as a conductor and a polyimide layer as an insulating material, is wound so that the aluminum surface is positioned in the drain wire side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shielded cable.

[0002]

2. Description of the Related Art Conventionally, a horizontal braided shield plated with copper has been used as a shield for electric wires.

Further, copper tapes and tapes obtained by laminating polyester on aluminum have been the mainstream.

[0004]

Since the conventional wire shield uses a horizontally wound shield braided shield plated with copper, the outer diameter of the shield is relatively large due to its structure.

Further, there is a tape-shaped tape in which a polyester is laminated on a copper tape or aluminum, but in consideration of environment resistance such as heat resistance and radiation resistance, further improvement is required.

The present invention has been made in view of the above points, and an object of the present invention is to provide a shielded cable which can be reduced in diameter, reduced in weight, and greatly improved in heat resistance and radiation resistance. To do.

[0007]

The above object can be achieved by forming a layer which also serves as a shield and a jacket from an aluminum / polyimide tape in which polyimide is laminated on aluminum.

[0008]

Since the above means is provided, the aluminum / polyimide tape excellent in heat resistance and radiation resistance serves as a shield and a jacket.

[0009]

EXAMPLES Next, the present invention will be specifically described by way of examples.

[Embodiment 1] FIGS. 1 and 2 show an embodiment of the present invention. In a shielded cable in which a shield and a jacket are covered around an insulator (polymer insulating layer: fluororesin) 2 provided on a conductor 1 which is an insulated wire core, in this embodiment, a layer which also serves as a shield and a jacket is provided. It was formed from aluminum / polyimide tape 3 in which polyimide was laminated on aluminum. By doing so, the aluminum / polyimide tape with excellent heat resistance and radiation resistance doubles as a shield and a jacket, and it is possible to reduce the diameter and weight of the tape.
It is possible to obtain a shielded cable that can be significantly reduced in weight, heat resistance, and radiation resistance.

That is, an aluminum / polyimide heat resistant insulated wire is used as a conductor 1, a polymer insulating layer 2, a drain wire 4, an aluminum / polyimide
It is formed of polyimide tape 3. As the polymer insulating layer 2, a fluororesin or the like having excellent electrical characteristics, heat resistance, flexibility, oil resistance, radiation resistance, and good workability is used. Drain wire 4 for easy connection and grounding work
The electric wire is obtained by stacking an aluminum / polyimide tape 3 in which aluminum as a conductor and polyimide as an insulator are integrated so that the aluminum surface is on the drain wire side (inner side).

By thus forming a layer that also serves as a shield and a jacket with aluminum / polyimide tape,
The intended purpose is achieved, which is explained below.

Table 1 shows the characteristics of the conventionally used polyerter tape and the polyimide tape of the present invention.

[0014]

[Table 1]

As shown in the table, polyimide has better heat resistance and radiation resistance than polyester.
The shield portion is not limited to braid and horizontal winding, but even if aluminum / polyester tape is used, it is usually necessary to cover it with a jacket material. However, in the cable of this embodiment, aluminum / polyimide tape is shielded. Since it also serves as a jacket, it is possible to reduce the diameter and weight accordingly.

As described above, the heat-resistant insulated wire according to the present embodiment has (1) heat resistance, (2) body radiation resistance, (3) weight reduction,
(4) To improve the diameter reduction. Also, by using tape instead of braiding and horizontal winding shield, terminal treatment,
Also in terms of manufacturing, complexity and trouble are eliminated.

The environment resistance can be further improved by coating the polyimide on the aluminum / polyimide tape coated with the insulating core and the drain wire.

Further, the electric wire according to this embodiment can be used as a multi-core cable.

[0019]

As described above, according to the present invention, since the layer which also serves as the shield and the jacket is formed of aluminum / polyimide tape in which polyimide is laminated on aluminum, an aluminum / polyimide tape excellent in heat resistance and radiation resistance can be obtained. By acting as both a shield and a jacket, it is possible to reduce the diameter and weight of the shield, and to obtain a shielded cable that can be made thinner, lighter, and have significantly improved heat resistance and radiation resistance. it can.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an embodiment of a shielded cable of the present invention.

FIG. 2 is a side view of the same embodiment.

[Explanation of symbols]

 1 conductor, 2 insulator (polymer insulating layer), 3 aluminum / polyimide tape.

Claims (2)

[Claims] 1. A shielded cable in which a shield and a jacket are covered around an insulated wire core, wherein the layer also serving as the shield and the jacket is formed of aluminum / polyimide tape in which polyimide is laminated on aluminum. A shielded cable characterized by the following. 2. The aluminum / polyimide tape having a polyimide coating thereon.
The shielded cable shown.