JPH0142887Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a shielded insulated wire, especially for televisions,
This invention relates to the improvement of shielded insulated wires used as internal wiring materials for electronic devices such as stereos.

FIG. 1 shows an example of a conventional insulated wire of this type, in which 1 is a conductor, 2 is an insulator applied to its outer periphery, and the two insulated conductors are arranged in parallel. 3 is a shield tape made of aluminum foil that covers the outer periphery of the insulated conductor in a figure 8 shape, and after a drain wire 4 is vertically attached, a jacket 5 is extruded and coated over the drain wire 4.

By the way, this type of conventional shielded insulated wire is
For the purpose of streamlining the terminal processing work, an adhesive layer is applied intermittently to the aluminum surface in contact with the jacket 5, and in the areas where the adhesive layer exists, the jacket 5 and the shielding tape 3 are integrated. Electrical contact between the shielding tape 3 and the drain wire 4 is made in the area where the layer is not present.

However, since the contact area between the shield tape 3 and the drain wire 4 is small, when vibration is applied to the electric wire, the electrical contact between the aluminum surface and the drain wire tends to become unstable, which may cause noise generation.

In view of the above points, the present invention inherits the advantages of terminal processing of shielded insulated wires using aluminum foil as a shielding material, while greatly improving the stability of the electrical contact between the drain wire and the aluminum foil surface when the wire vibrates. This was proposed for the purpose of providing an improved shielded insulated wire, and its gist is that two insulated conductors are placed in parallel on the outer periphery, one of the insulated conductors is placed in a "〓" shape, and the other is A piece of shielding tape is vertically attached to cover almost the entire circumference of each in a "〓" shape, and a piece of shielding tape is placed inside the shielding tape in the gap between the shielding tape and the two insulated conductors. A drain wire is attached vertically along the insulated conductor in continuous contact, and the shielding tape is a composite tape of metal and plastic, with the metal side on the inside and the plastic side on the outside, and the plastic side is exposed to heat from the extrusion of the jacket. A shielded insulated wire characterized by being fused and integrated with a jacket.

In the above, the conductor used is an annealed copper stranded wire, a tin-plated annealed copper stranded wire, a bulk tin-coated annealed copper stranded wire, or the like.

As the drain wire, the same one as the conductor described above is used.

Suitable insulators include polyethylene, foamed polyethylene, vinyl chloride, crosslinked products thereof, semi-rigid vinyl, and the like.

Vinyl chloride is suitable for the jacket.
Aluminum foil or copper foil is used as the shield tape, and the thickness is about 7 to 20 microns.

Since aluminum foil or copper foil has low tensile strength and is difficult to manufacture, a reinforcing layer such as polyester tape is provided to reinforce the foil.

When a reinforcing layer is provided, the metal foil can be made thinner, which has the advantage of reducing material costs. When polyester tape is used as the reinforcing layer, the polyester tape and jacket tend to fuse together due to extrusion heat during jacket coating.
When the tape thickness is 6 to 10 microns, the shield tape is peeled off at the same time as the jacket is peeled off.

The shielding tape and the jacket are further integrated by coating the surface of the reinforcing layer in contact with the jacket with a paint made of the same material as the jacket, that is, vinyl chloride paint.

Next, an embodiment of the shielded insulated wire of the present invention will be further described with reference to FIGS. 2 and 3 of the accompanying drawings.

1 is a conductor made of tin-plated annealed copper stranded wire, 2
is an extrusion coated polyethylene insulation around its outer circumference.

3 is a shield tape and two insulated conductors 2
One side is wrapped in a ``〓'' shape, and the other side is wrapped in a ``〓'' shape, so that almost the entire circumference of each is covered.

A drain wire 4 is connected to the shield tape 3 in a space surrounded by the two insulated conductors 2 and the shield tape 3.
It is attached vertically so that it is in continuous contact with the inside of the

In this way, each of the two insulated conductors 2 is covered with the shielding tape 3, and since the drain wire 4 is attached vertically in continuous contact with the inside of the shielding tape 3, an excellent shielding effect can be achieved. realizable.

A jacket 5 made of vinyl chloride is extruded and coated on the outermost periphery to complete a shielded insulated wire.

As shown in FIG. 3, the shielding tape 3 includes a polyester tape 7 for reinforcement on one side of the copper foil 6.
is provided.

The copper foil surface of the shield tape 3 is connected to the drain wire 4
The outer polyester tape is fused by the extrusion heat of the jacket 5, so that the jacket 5 and the shield tape 3 are integrated.

It was confirmed that in the insulated wire of this example constructed in this manner, the shield tape 3 was also peeled off at the same time as the jacket 5 was peeled off.

It was also confirmed that the electrical contact between the copper foil 6 and the drain wire 4 was stable when the wire vibrated, and furthermore, the copper foil did not break even when the wire was bent.

According to the present invention constructed as described above, it is possible to provide an electrically excellent shielded insulated wire that is easy to terminally process, has stable contact resistance when the wire vibrates, and has practical advantages. There is great value.

[Brief explanation of drawings]

Fig. 1 is an explanatory cross-sectional view showing an example of a conventional shielded insulated wire, Fig. 2 is an explanatory cross-sectional view showing an example of the insulated wire of the present invention, and Fig. 3 is an explanatory cross-sectional view showing an example of the insulated wire of the present invention. It is a perspective explanatory view showing an example of a shield tape. 1: Conductor, 2: Insulator, 3: Shield tape,
4: drain wire, 5: jacket, 6: copper foil,
7: Polyester tape.

Claims (1)

[Scope of utility model registration request] A piece of shielding tape is placed around the outer periphery of two insulated conductors arranged in parallel, wrapping one of the insulated conductors in a "〓" shape and the other in a "〓" shape so as to cover almost the entire circumference of each. A drain wire is vertically attached to the gap between the shield tape and the two insulated conductors, and a drain wire is attached vertically along the insulated conductor while continuously contacting the inside of the shield tape. A shielded insulated wire that is a composite tape, with a metal side on the inside and a plastic side on the outside, and the plastic side is melted and integrated with the jacket by the extrusion heat of the jacket.