JP2589788Y2 - Shielded laminated electric wire - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shielded laminated electric wire used for wiring of an electric vehicle, for example.

[0002]

2. Description of the Related Art Recently, there has been a tendency to employ a system in which various on-vehicle electrical components are collectively controlled by a microcomputer. However, electromagnetic waves generated from various peripheral devices and an alternator in the vehicle are erroneous. The point that causes the operation is a problem. Therefore, shielded electric wires are used for an engine system, a power supply system directly connected to a battery, and a signal system.

[0003] (Electromagnetic) induction prevention tape 30 shown in FIG.
Is provided with an induction preventing body 33 between a plurality of conductors 31 arranged in parallel and insulated by an internal insulator 32.
The induction preventing body 33 is made of a conductive resin having a volume resistance of 10 ⁻² to 10 ⁴ Ω · cm (Japanese Patent Laid-Open No. 4-4518).

FIG. 7 shows a conventional shielded tape wire. This shield tape electric wire 35 has a plurality of conductors 36 arranged in a row in a row at a pitch p, and insulating layers 37 on both sides thereof.
At least one conductor (drain wire) 39 is arranged at an equal pitch p on the side of the tape wire 38 configured by providing
Further, a shield layer 40 is provided on at least one surface of the tape electric wire 38, and the layer 40 is extended laterally to be in contact with the conductor 39 (Japanese Utility Model Application No. 63-165719).

The conductive tape 30 shown in FIG. 6 uses a conductive resin as a shield layer. However, the current conductive resin has a conductivity of one thousandth or less that of a metal, and a sufficient shielding effect can be obtained. Did not. 7 has a structure in which a metal foil or a metal mesh and a drain wire 39 are connected to a shielding layer 40 with an adhesive, but since the contact between the metal foil and the drain wire is partial, it is bent. Etc., the durability is poor, and the electrical connection becomes unstable.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a shielded laminated electric wire having durability against external force such as bending and having a weak electromagnetic shielding property.

[0007]

According to the present invention, there is provided an electronic apparatus comprising:
As described in the above, a drain wire is juxtaposed at appropriate intervals on the side of a laminated electric wire formed by providing an insulating layer on the outer periphery of a laminated conductor in which a plurality of band-shaped conductors are laminated, and the drain wire and the laminated electric wire This is achieved by covering both surfaces with a composite sheet for shielding constituted by laminating a conductive hot-melt resin layer and a metal foil, and further providing an outer insulating layer on the outer periphery thereof. The laminated electric wire is formed to be bendable with respect to the lamination surface as described in claim 2, but may be formed as a rigid body as a whole (claim 3).

[0008]

The shielded laminated electric wire according to the present invention has a structure in which the inner conductor is formed by laminating a plurality of band-shaped conductors (or rectangular conductors). In addition, since the laminated electric wire and drain wire are covered with a highly conductive shielding composite sheet, it has an excellent electromagnetic shielding effect, and the conductive wire of the composite sheet fixes the drain wire and the laminated electric wire. Therefore, the bending resistance is good and the electrical connection is stable.
Furthermore, by configuring the laminated electric wire as a rigid body,
It can be used as a connection fitting for electric equipment such as a battery.

[0009]

1 and 2, reference numeral 1 denotes a laminated shielded electric wire, and a laminated electric wire 4 is formed by providing an insulating layer 3 on the outer periphery of a laminated conductor in which a plurality of band-shaped conductors 2 are laminated. A composite sheet for shielding formed by arranging drain wires 5 side by side at appropriate intervals at the sides of the wire and laminating a conductive hot-melt resin layer 6 and a metal foil 7 on both sides of the drain wires 5 and the laminated electric wire 4. 8, and an outer insulating layer 9 is provided on the outer periphery.

The strip-shaped conductor 2 is a so-called rectangular conductor, and a flexible copper ribbon wire having a thickness of about 10 to 200 μm is preferably used. Although the illustrated band-shaped conductor 2 shows an example in which four layers are stacked, the number of layers can be increased or decreased according to a desired current capacity. For the insulating layer 3 and the outer insulating layer 9, a thermoplastic resin generally used for coating an electric wire, for example, polyvinyl chloride, polyethylene, or the like is used. As the drain wire 5, not only a rectangular conductor as shown in the figure but also a normal stranded wire or a single wire can be used.

In the present invention, the shielding composite sheet 8 is used.
Is preferably, for example, an aluminum foil or the like, and a conductive hot-melt resin layer 6 is provided on at least one surface thereof. The conductive hot-melt resin layer 6 is made of a so-called hot melt as a base material, and if necessary, a tackifier,
Additives such as plasticizer, anti-aging agent, etc.
m or less (in the case of carbon fiber, 50 μm or less in length) of 30 to 100 parts by weight of a conductive filler.

As the hot melt, polyvinyl chloride (PVC), polybutylene terephthalate (PBT),
Thermoplastic resins such as polyethylene (PE), polypropylene (PP), ethylene ethyl acrylate (EEA) and ethylene vinyl acrylate (EVA), synthetic rubbers such as nitrile butadiene rubber (NBR) and ethylene propylene diene monomer (EPDM). is there. Ni, Cu, Al, Au, A
g, SUS and other metal powders, fibers and flakes, as well as natural or artificial graphite, carbonaceous whiskers, carbon fibers, carbon black and the like.

The drain wire 5 is securely fixed together with the laminated electric wire 4 from both the upper and lower surfaces by welding the conductive hot-melt resin layers 6, 6 of the shielding composite sheets 8, 8, so that a stable electric connection state can be obtained. Further, since the laminated electric wire 4 is formed by superposing a plurality of band-shaped conductors 2, when an external force such as bending acts on the surface thereof, the band-shaped conductors 2 having flexibility of each layer slide, so that they are bent without difficulty. I do.

(Test Example) The strip conductor shown in FIGS. 1 and 2 is 20 mm wide and 130 μm thick.
The laminated electric wire 4 was formed by laminating fifteen rectangular copper wires having a thickness of 25 m and providing an insulating layer 3 made of polyvinyl chloride having a thickness of 25 μm on the outer periphery thereof. With the copper wire of 0.3 mm ² arranged as the drain wire 5 at a distance of 5 mm from the laminated electric wire 4, the following three types of shielding sheets A to C (150 mm ×
150 mm × 20 μm) and a 25 μm-thick polyvinyl chloride outer insulating layer 9 was further provided on the outer periphery of the shielded laminated electric wire, and the shielding effect in the near electric field was compared by the KEC method.

[Composite sheet A for shielding] (the present invention): EVA is mixed with 30% by weight of conductive carbon black,
This was dissolved in toluene to form a paint, which was applied to a 10 μm Al foil to produce a composite sheet A for shielding having a 10 μm conductive heat-fused resin layer formed thereon. The specific resistance (ρ) of this conductive hot-melt resin is 7 × 10 ⁻¹ Ω · cm. [Composite Sheet B for Shield] (Comparative Test Example 1): Same as the composite sheet A for shield except that EVA containing no conductive filler was applied in a thickness of 10 µm instead of the conductive hot-melt resin layer. [Sheet C for Shielding] (Comparative Test Example 2): Conductive hot-melt resin of Sheet A having a thickness of 2 without using Al foil
A sheet of 0 μm.

The results obtained are shown in Table 1. Table 1 (500MH _z) Test Example 1 80 dB Comparative Test Example 1 15 dB Comparative Test Example 2 20 dB generally shielding effect is determined that there effect more than 40dB, but the shield laminated wire according to the present invention satisfies this Is evident.

FIG. 3 is an explanatory view showing a process of forming a shielded laminated electric wire according to another embodiment of the present invention, and FIG. 4 is a perspective view thereof. The shield laminated electric wire 11 is formed as a shield connection fitting having rigidity. That is, 12 has a thickness of 0.1.
It is a band-shaped conductor made of a hard copper rectangular plate of about 1 mm. A plurality of the band-shaped conductors 12 are stacked, and an inverted V-shaped curved portion 12A is provided at the center by bending, and both ends of the laminated band-shaped conductor 12 are soldered. Fix with.

An insulating layer 13 is provided on the outer periphery of the curved portion 12A, and its inner and outer surfaces are covered with a shielding composite sheet 18 formed by laminating a conductive hot-melt resin layer 16 and a metal foil 17 together with a drain wire 15, Further, an external insulating layer 19 is provided on the outer periphery, and bolt insertion holes 20 are provided in the exposed laminated conductor portions 12B at both ends. The insulating layer 1
3 and 19 and the conductive hot-melt resin layer 16 are the same as those in the first embodiment, and a description thereof will be omitted.

FIG. 5 shows an example of use of the shield connection fitting 11, wherein 21 is a battery, and 22 is a bolt as a battery post. Using the shield connection fitting 11 of the present invention, the two batteries 21 and 21 are tightened and fixed with the washers 23 and the nuts 24, and the drain wire 1 is fixed.
When 5 is connected to a ground (not shown), the excellent electromagnetic shielding effect prevents the battery 21 from being mixed with external interference radio waves.

[0020]

According to the present invention, the shielded laminated electric wire according to the present invention includes a plurality of band-shaped conductors, and a drain wire is juxtaposed at appropriate intervals on the side of the laminated electric wire formed by providing an insulating layer on the outer periphery of the laminated conductor. Since both surfaces of the drain wire and the laminated electric wire are covered with a shielding composite sheet formed by laminating a conductive hot-melt resin layer and a metal foil, and further, an external insulating layer is provided on both surfaces thereof. The laminated electric wire can be formed to be flexible or rigid depending on the purpose of use, and can be used as a shielded wire having bending resistance and a shield connection having rigidity. Can be used as metal fittings.

[Brief description of the drawings]

FIG. 1 is a perspective view of a shielded laminated electric wire showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a diagram illustrating a process of forming a shielded laminated electric wire according to another embodiment of the present invention.

FIG. 4 is a perspective view of the shielded laminated electric wire of FIG. 3;

FIG. 5 is an explanatory diagram of a method of using the shielded laminated electric wire of FIG. 3;

FIG. 6 is an explanatory diagram of a conventional shielded electric wire.

FIG. 7 is an explanatory view of another conventional shielded electric wire.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1,11 Shield laminated electric wire 2,12 Strip conductor 3,13 Insulating layer 4 Laminated electric wire 5,15 Drain wire 6,16 Conductive hot-melt resin layer 7,17 Metal foil 8,18 Shielding composite sheet 9,19 External insulating layer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01B 11/00 H01B 7/08 H01B 7/18 H01B 11/06

Claims (3)

(57) [Scope of request for utility model registration] A drain wire is juxtaposed at an appropriate interval on the side of a laminated electric wire formed by providing an insulating layer on the outer periphery of a laminated conductor in which a plurality of strip-shaped conductors are laminated. Is covered with a shielding composite sheet formed by laminating a conductive hot-melt resin layer and a metal foil, and an outer insulating layer is further provided on the outer periphery thereof. 2. The shielded laminated electric wire according to claim 1, wherein the laminated electric wire is formed to be bendable with respect to a lamination surface. 3. The shielded laminated electric wire according to claim 1, wherein the laminated electric wire is formed as a rigid body as a whole.