JPH05274923A - Multi-conductor round coaxial cable - Google Patents

Abstract

PURPOSE:To enable coaxial conductors to be smoothly twisted, and the ends thereof to be flattened in a multiple way by adopting an elliptical form, instead of a rectangular form, for the PVC jacket of the coaxial conductors, and providing a recess at the central upper position of the jacket. CONSTITUTION:25 coaxial conductors (50 cores) having a PVC jacket 1 of approximately elliptical form are stranded, and covered with an intermediate sheath of PVC. In addition, a shield braid is used to cover the sheath. The conductors so formed are cut to the prescribed length. Then, the sheath at both ends is peeled and the coaxial conductors are taken out for arrangement and fused in a flattened way. As a result, only both ends of the conductors can be flattened in a multiple way, and the intermediate section thereof becomes round. Also, the coaxial conductors are so laid in parallel that two conductors can keep a constant pitch from each other, and integrated with the jacket 1, thereby enabling a connecting work to become easy. Also, a recess section is formed at the central upper position of the jacket 1 and a processing work for flattening the ends in a multiple way can thereby be made easy. According to this construction, the conductors can be smoothly stranded, and reliability or the like can be improved.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a multi-core round coaxial cable, and more particularly to a PVC jacket shape of a coaxial core.

[0002]

2. Description of the Related Art Conventionally, the PVC jacket shape of the coaxial core of a multi-core round coaxial cable has been rectangular.

That is, a PV having a rectangular cross section as shown in FIG.
Multiple coaxial cores having the C jacket 1 are twisted together to form a round sheath, and the coaxial cores are flatly aligned and fused at both ends.

The reason why the shape of the coaxial core is limited here is that it is necessary to make the PVC jacket of the coaxial core rectangular in order to make the both ends multi-flat to ensure dimensional accuracy.

In FIG. 2, 5 is an internal conductor, 3 is an insulator extruded on the outer periphery of the conductor, 4 is a drain wire vertically attached to the insulator 3, and both are made of Al / PS tape. The shield tapes are vertically formed, and the two tapes are arranged in parallel so as to keep the pitch between the lines constant and integrated by the PVC jacket 1.

[0006]

[Problems of the prior art] However, since the PVC jacket of the coaxial core has a rectangular shape in this conventional multi-core round coaxial cable, a kink is generated when the multi-cores are twisted, and a smooth twist is produced. There was a problem that I could not do.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a novel multi-core circular coaxial cable which solves the above-mentioned drawbacks of the prior art and enables smooth twisting of the multi-core circular coaxial cable.

[0008]

SUMMARY OF THE INVENTION The gist of the present invention is to smooth the twisting of multiple cores by changing the shape of the PVC jacket of the coaxial core from a rectangular shape to an elliptical shape.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the coaxial wire core used in the multi-core round coaxial cable of the present invention, in which the PVC jacket 1 has a substantially elliptical shape and has 25 coaxial wire cores. The cores (50 cores) are twisted together, the PVC sheath is covered with PVC, the shield sheath is braided, and the PVC sheath is cut to a specified length. Take out, align flat, and fuse.

By doing so, a multi-core circular coaxial cable in which both ends are multi-flatted and the middle is round is completed.

In FIG. 1, reference numeral 5 is an internal conductor, and an outer periphery of which is covered with an insulator 3 by extrusion.

Reference numeral 4 denotes a drain wire vertically attached to this insulated conductor, which acts as a ground wire.

As the material of the inner conductor 5 and the drain wire 4, conventionally known copper single wire, stranded wire, tin-plated annealed copper wire,
A wire or the like in which the outer circumference of the stranded wire is collectively coated by tin plating is used.

As the insulator 4, PVC, PE, foamed P
Insulators such as E and fluorine resin, which have been conventionally used, can be used as they are.

Reference numeral 2 is a shield which integrally encloses the insulated conductor and the drain wire 4, and is formed by vertical attachment molding or winding.

As an optimum embodiment of the shield 2, a laminated tape of aluminum foil and polyester is used. By molding the aluminum foil surface with the aluminum foil surface inside, the shield wire 2 comes into contact with the drain wire 4 to obtain electrical conduction.

The polyester tape is for reinforcing the aluminum foil and facilitates the molding operation.

The two coaxial cores thus formed are arranged in parallel so as to keep the pitch between the wires constant, and are formed in a substantially elliptical shape P.
It is integrated by the VC jacket 1.

Here, two coaxial cores are put together to form a PV.
The reason why the pitch between the wires is kept constant by the C jacket 1 is to collectively press-connect the coaxial cables, and the connecting work is easy.

The PVC jacket 1 is provided with a recess at the upper center thereof for the purpose of providing directionality and for facilitating the terminal processing work for making the terminal flat in multiple. is there.

[0021]

As described above, according to the present invention, the P of the coaxial wire core is used.
By making the shape of the VC jacket substantially elliptical, kink does not occur during multi-core twisting.

Reliability is improved (since there is no kink, disconnection is eliminated).

The number of rotations of twisting is increased, and the productivity is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a coaxial fiber core used in the present invention.

FIG. 2 is a cross-sectional view of an example of a conventional coaxial core.

[Explanation of symbols] 1 PVC jacket 2 Shield (Al / PS tape) 3 Insulator 4 Drain wire 5 Inner conductor

Claims (2)

[Claims] 1. A coaxial fiber core having a jacket having a substantially elliptical cross section is twisted together, a round sheath is applied to the whole, and the coaxial fiber cores of both terminals are flatly aligned and fused. A multi-core circular coaxial cable characterized by that. 2. A structure in which coaxial cores are arranged in parallel so as to maintain a constant pitch between lines to provide a substantially elliptical jacket, and a concave portion is provided for giving directionality to a part of the elliptical shape. The multi-core circular coaxial cable according to claim 1, wherein