JPH0770253B2 - Shield wire for crimp connection - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pressure-contacting shielded wire, and more particularly to a pressure-contacting shielded wire with improved shield characteristics.

[Prior Art] Conventionally, as a pressure-welding shielded wire, two insulated conductors having conductors coated with an insulator are arranged in parallel, and a drain wire coated with conductive plastic is arranged in parallel on one side.
It is known that a metal tape is vertically attached to the outer periphery of the shield layer to form a shield layer, and the outer periphery of the shield layer is extruded and coated with plastic to provide a jacket.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional shielded wire for pressure contact connection, since the drain wire has a structure in which the drain wire is in contact with the shield layer of the metal tape such as the aluminum foil polyester laminated tape through the conductive plastic, The contact resistance with the shield layer was large and the shield characteristics were poor. This is because the electric resistance of conductive plastic is higher than that of metal. In addition, since the drain wire for connection with the pressure contact connector is coated with conductive plastic on the outer periphery and has the same outer diameter as the insulated conductor, direct contact with the shield layer was not possible.

It is an object of the present invention to provide a shielded wire for pressure contact connection which has improved the above-mentioned drawbacks of the prior art and has significantly improved shield characteristics.

[Means for Solving the Problem] The shielded wire for pressure contact connection of the present invention is configured such that the drain wire is displaced and covered with respect to the conductive plastic to partially expose the conductive wire. A metal tape is wound around to form a metal layer that matches the outer diameter of the insulated conductor, and the metal layer directly contacts the exposed portion of the drain wire and the shield layer with each other.

The metal layer is formed of a metal tape such as a copper foil tape or an aluminum foil tape.

As the shield layer, a copper foil tape with a thickness of 10 μm or less and an elongation of 15% or more, a metal foil laminated with an aluminum foil tape and a polyester tape of 7 μm or less, or a copper foil with a thickness of 18 μm or less and an elongation of 15% or more It is formed by using a metal tape such as a tape, an aluminum foil tape or the like, or a metal tape provided with holes, and a surface of which is embossed and a concave portion is provided with an adhesive layer of a synthetic resin such as polyvinyl chloride.

As the insulator, a synthetic resin such as flame-retardant polyethylene, foamed polyethylene, or polyolefin resin such as polypropylene is used.

[Operation] In the shielded wire for pressure contact connection of the present invention, the drain wire and the shield layer are formed so as to be in contact with each other through the metal layer, so that the contact resistance between the drain wire and the shield layer can be reduced, and the shield characteristics can be improved. Can be greatly improved.

Further, since the metal layer is formed by winding the metal tape around the outer periphery of the conductive plastic, the contact pressure between the metal layer and the drain wire is obtained by the winding force of the metal tape, and the contact conduction can be stabilized over time. Furthermore, since the metal layer is formed so as to match the outer diameter of the insulated conductor, the pressure contact connector can be easily connected.

[Examples] FIG. 1 shows an example of a shield wire for pressure contact connection according to the present invention. Reference numeral 1 is a conductor, 2 is an insulator, 3 and 4 are insulated conductors, 5 is a drain wire, 6 is a conductive plastic, 7 is a metal layer, 8 is a shield layer, and 9 is a jacket.

The conductor 1 is made of tin-plated annealed copper wire, and the outer periphery of the conductor 1 is extruded and covered with an insulator 2 such as flame-retardant polyethylene.
Insulated conductors 3 and 4 are formed. The drain wire 5 is made of tin-plated annealed copper wire, and a conductive plastic 6 such as conductive polyvinyl chloride is extruded and coated on the outer periphery of the drain wire 5 so as to expose a part of the surface of the drain wire 5. The metal layer 7 is made of a copper foil tape having a thickness of 18 μm and an elongation of 15%, and is formed by being wound around the outer circumference of the conductive plastic 6 so as to come into contact with the exposed drain wire 5. At this time, the outer diameter of the drain wire 5 provided with the metal layer 7 becomes the same as the outer diameter of the insulated conductors 3 and 4. The shield layer 8 has a thickness of 10 μm, a copper foil tape with an elongation of 15% and a thickness of 7 μm.
17 μm thick laminated with m polyester tape
Made of copper foil polyester laminated tape, and two insulated conductors 3, 4 arranged in parallel and those insulated conductors 3, 4
The outer periphery of the drain wire 5 having the metal layer 7 provided on one side thereof is vertically provided and covered. At this time, the shield layer 8 between the two insulated conductors 3 and 4 and between the insulated conductor 4 and the drain wire 5 is adhered and integrated by welding, air and moisture are prevented from entering through these gaps, and the copper foil tape Surface oxidation is prevented. The jacket 9 is made of plastic such as polyvinyl chloride, and is provided by extrusion coating on the outer periphery of the shield layer 8.

As described above, since the drain wire and the shield layer are provided so as to be in contact with each other through the metal layer, the contact resistance between the drain wire and the shield layer can be reduced, and the shield characteristic can be significantly improved. Further, the outer diameter of the drain wire provided with the metal layer can be made the same as the outer diameter of the insulated conductor, so that it can be easily connected to the press-connecting connector.

In the embodiment of the present invention, the structure in which the drain wire is arranged only on one side of the two insulated conductors arranged in parallel has been described. However, the drain wire is formed in the center and the insulated conductors are arranged in parallel on both sides thereof. May be.

FIG. 2 shows another embodiment of the shield tape used in the present invention. In Fig. 2 (1), a hole 11 is formed in a copper foil tape 10 having a thickness of 18 µm and an elongation of 15%, and the outer circumference of the copper foil tape 10 is extruded and covered with a polyvinyl chloride jacket. When installing this hole 11
Polyvinyl chloride is filled in and the copper foil tapes 10 are brought into close contact with each other to form a closed structure of the insulated conductor and the drain wire. As shown in FIG. 2 (2), a copper foil tape 12 having a thickness of 18 μm and an elongation of 15% is embossed, and an adhesive layer 14 made of a synthetic resin such as polyvinyl chloride is provided in a recess 13 on the surface thereof. It is provided vertically along the outer periphery of the insulated conductor and the drain wire arranged in parallel, and their adhesive layers 14 are adhered to each other, and the copper foil tape 12 is adhered to each other to form a closed structure of the insulated conductor and the drain wire. is there.

[Effect of the Invention] As described above, the shielded wire for pressure contact connection of the present invention is configured such that the drain wire is displaced and covered with respect to the conductive plastic to expose a part thereof.
Since a metal layer is formed on the outer periphery of the conductive plastic and the metal layer and the exposed portion of the drain wire and the shield layer are in direct contact with each other, the contact resistance can be reduced and the shield characteristics can be greatly improved. There is an effect.

Further, since the metal layer is formed by winding the metal tape around the outer periphery of the conductive plastic, the contact pressure between the metal layer and the drain wire is secured by the winding force of the metal tape, and the contact is made even when subjected to bending force such as bending. Conductivity can be maintained, and the outer diameter of the conductive plastic is matched with the outer diameter of the insulated conductor to simplify the connection of the insulation displacement connector. It is possible to provide a highly reliable line, which is of great practical value.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing an embodiment of the pressure-welding shield wire of the present invention, and FIG. 2 is an explanatory view showing another embodiment of the shield tape used in the present invention. 1: Conductor, 2: Insulator, 3: Insulated conductor, 4: Insulated conductor, 5: Drain wire, 6: Conductive plastic, 7: Metal layer, 8: Shield layer, 9: Jacket.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshiro Yoshiro 5-1-1 Hidakacho, Hitachi City, Ibaraki Prefecture Hidaka Plant, Hitachi Cable, Ltd. (72) Mitsuo Kimoto Hidakacho, Hitachi City, Ibaraki Prefecture 5-1-1 Hitachi Cable Co., Ltd. Hidaka Plant (72) Inventor Koichi Nakajima 5-1-1 Hidakacho, Hitachi City, Ibaraki Hitachi Cable Co., Ltd. Hidaka Plant (56) References 62-76424 (JP, U) Actually opened 61-166333 (JP, U)

Claims (1)

[Claims] 1. An insulated conductor having an outer conductor coated with an insulator, and a drain wire covered with a conductive plastic, which is finished so as to match the outer diameter of the insulated conductor, are arranged in parallel. In a shielded wire for pressure contact connection, in which a metal tape is vertically attached to the outer periphery of the insulated conductor and the conductive plastic-coated drain wire to provide a shield layer, and the outer periphery of the shield layer is covered with a jacket, the drain wire is made of conductive plastic. A part of it is exposed by being displaced with respect to, and a metal tape is wrapped around the outer periphery of the conductive plastic to form a metal layer that matches the outer diameter of the insulated conductor,
A shielded wire for pressure contact connection, characterized in that the metal layer directly contacts the exposed portion of the drain wire and the shield layer with each other.