JPH0436906A - Shielded wire - Google Patents

Abstract

PURPOSE:To keep the electric continuity between a drain wire and a metal tape and prevent the peeling-off of a shielding tape by spirally applying adhesive to the surface of copper foil of a copper foil laminate polyester tape to form a shielding layer. CONSTITUTION:A shielding tape 3 is made up by sticking a copper foil 7 and a polyester tape 9 for reinforcement with a polyester adhesive 8. Polyester or polyolefin or vinyl chloride adhesive 11 is applied to the surface of the polyester tape at the side under this shielding tape, and on to the surface of the copper foil 7 at the side thereabove, polyester, polyolefin or vinyl chloride adhesive 12 is spirally applied in the direction of the tape. The side of this adhesive layer 12 is set inside to cover the drain wire and a signal wire core.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a shielded wire, particularly to a shielded wire used inside an electronic device.

[Conventional technology] An example of a conventional shielded electric wire will be explained with reference to the drawings.

In FIG. 5, a shielded wire 10 has a signal wire core in which a conductor 1 made of stranded wires is covered with an insulator 2, and a drain wire 4 made of stranded wires arranged in parallel with the signal wire core, and the outer periphery of the wire core is covered with shield tape 3. It is covered vertically in the shape of a pair of glasses with an ear 6 in the center, and an insulating jacket 5 is placed around the outer circumference of the glasses.
5' is integrally extruded and coated. Further, if the outer diameter of the signal wire core is A, and the outer diameter of the jacket portion covering the drain wire is B, they are formed to have the same diameter as A=B.

In order to pressure-connect the shielded wire 10 configured in this way to a connector, for example, as schematically shown in FIG. Using vinyl acetate adhesive on the polyester side of the metal foil laminated polyester tape of the shielding tape 3, make sure that the shielding tape 3 and the jacket 5' are in close contact with each other, leaving the metal foil laminated polyester tape on the signal line side. Make sure that no tape 3 remains.

[Problems to be Solved by the Invention] By the way, when the jacket 5 of the signal wire core end is peeled off and pressure-bonded to the connector, and when the harness is assembled after pressure-bonding, the wrapped metal foil laminated polyester tape 3 is removed. Since there is no adhesion between the metal foil surfaces, the drain wire 4 may be exposed or
] The tape 3 was peeled off and exposed, and there was a risk of a short circuit when it was assembled into a circuit.

The present invention has been made in view of the above points, and aims to eliminate the above-mentioned drawbacks of the prior art, and to provide an improved shielded wire for electronic equipment that does not have problems in terminal processing. .

[Means and effects for solving the problem] This invention has the following features:
The insulated core wire and drain wire are arranged in parallel, and the surfaces of the insulated core wire and drain wire are wrapped vertically with copper foil laminated polyester tape coated with adhesive to form a shield layer, and the outer periphery of this is covered with a jacket. 1. Copper foil laminate forming the shield layer 1 - An adhesive is applied intermittently in a spiral manner on the copper foil of the polyester cheese, and the adhesive is applied on the polyamide surface. This is a shielded wire characterized in that a shielding layer is formed using a material coated on the entire surface.

Therefore, unlike the conventional shielding tape, which has no metal surface, in this invention, an adhesive layer is provided intermittently on the metal surface of the copper foil laminate l=polyester tape that forms the shield layer. Since the drain wire is covered on the inside, electrical continuity between the drain wire and the metal tape is maintained, and the metal tape is in close contact with the drain wire, and the overlapping portions of the metal tapes are also securely bonded, making it possible to protect the shield. This will prevent the tape from peeling off.

[Example] Hereinafter, the present invention will be described in detail based on the drawings. 1st
The figure is a cross-sectional view showing the configuration of an embodiment of the shielded wire. Specifically, the shielded wire 20 has a signal wire core in which a conductor 1 made of a plurality of stranded wires is coated with an insulator 2, and a drain wire 4 made of a plurality of stranded wires are arranged in parallel, and a copper foil laminated polyester tape ( A shield tape (hereinafter referred to as shield tape) 3 is placed vertically with an ear part 6 formed at the center in a spectacle-like manner so as to cover the outer periphery of the signal wire core and drain wire, and the outer periphery is further covered with vinyl chloride jacket F 5 + 5.
′ is formed by extrusion coating in one direction.

At this time, the adhesive force between the shield tape 3 and the jacket 5° 5' is determined when the dave width of the shield tape 3 is 1.0 mm.
40g or more is required per serving. And shield tape 3
The wrap is formed by overlapping the shield tape wrapped around the outer periphery of the drain wire 4 on the left side so that it is under the tape wrapped around the outer periphery of the right signal wire core, as shown in Figure 1. do.

As shown in the cross-sectional view of FIG. 2, the shield tape 3 is made of a copper foil 7 with a thickness of 7 to 12 mm and a thickness of 6 mm± for reinforcement.
1. It is constructed by pasting polyester chips 9 with a polyester adhesive 8. Apply 15 to 2.5 g of polyester, polyolefin, or vinyl chloride adhesive 11 to the surface of the lower polyester tube 9.
m2, and also apply polyester, polyolefin, or vinyl chloride adhesive 1 to the surface of the upper copper foil 7.
2, as shown in Fig. 3, with a coating width C of 1 to 3 mm and a non-coating width d of 1 to 6 mm in a spiral pattern at an angle of 20° to the tape direction.
The one applied at 60° is used. Then, the drain wire 4 and the signal wire core are covered with the adhesive layer 12 side facing inside. Therefore, electrical conduction between the drain wire 4 and the shield tape 3 is maintained, the shield tape 3 is closely attached to the drain wire 4, and the overlapping portion 1 of the shield tape 3 is also well bonded, so that the shield tape 3 can be peeled off. It is possible to reliably prevent this.

As a result, when the end of the shielded wire 20 is processed,
The overlapping portions of the shield tape 3 are completely bonded and will not be exposed or come apart.

In the above example, the signal core and the drain wire are each one shielded wire, but as shown in FIG. 4, there are multiple signal cores and one drain wire 4. The same is possible in the case of wire cores.

[Effects of the Invention] As explained above, the shielded wire of the present invention is obtained by applying a polyester-based, polyolefin-based, or vinyl chloride-based adhesive to the entire surface of the polyester surface of a copper foil laminated polyester tape, and applying a polyester-based adhesive to the copper foil surface. Since the shield layer is formed by applying a polyolefin-based or vinyl chloride-based adhesive intermittently in a spiral pattern, a shielded wire with a structure that does not expose the drain wire or cut the shield tape during terminal processing can be manufactured. becomes possible.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the configuration of a shielded wire according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of a copper foil laminate tape forming a shield layer, and Fig. 3 is a cross-sectional view showing the shape of the adhesive applied. FIG. 4 is a plan view, FIG. 5 is a sectional view, and FIG. 6 is a diagram showing the origin. Cross-section showing the structure of other shielded wires Horizontal model showing the relationship between the insulator and jacket without showing the structure of conventional shielded wires Conductor 2 Insulator 3 Copper foil laminated polyester tabled layer ) 4...Drain wire 5.5'...Jacket 6...Ear portion 7...Copper foil 8.11.12...Adhesive 9...Polyester Chive Patent applicant Hitachi Cable, Ltd.

Claims (1)

[Claims] The insulated core wire and drain wire are arranged in parallel, and the surfaces of the insulated core wire and drain wire are wrapped vertically with copper foil laminated polyester tape coated with adhesive to form a shield layer, and the outer periphery of this is covered with a jacket. A shielded wire having a structure in which an adhesive is applied spirally on the copper foil of the copper foil laminated polyester tape that forms the above-mentioned shield layer, and an adhesive is applied entirely on the polyester surface is used. A shielded electric wire characterized in that a shielding layer is formed by forming a shielding layer.