JPH0684632U - Shielded laminated wire - Google Patents

Abstract

(57) [Summary] [Purpose] It is an object to provide a shielded laminated electric wire that has durability against external force such as bending and has a blunt electromagnetic shielding property. [Structure] An insulating layer 3 is provided on the outer periphery of a laminated conductor in which a plurality of strip conductors 2 are laminated to form a laminated electric wire 4. A drain wire 5 is juxtaposed on the side of the laminated electric wire 4 at appropriate intervals, and a conductive hot-melt resin layer 6 and a metal foil 7 are laminated on both surfaces of the drain wire and the laminated electric wire 4 to form a shield. An outer insulating layer 9 is provided on the outer periphery of the composite sheet 8 for coating.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shielded laminated electric wire used for wiring an electric vehicle, for example.

[0002]

[Prior art]

 Recently, there is a tendency to adopt a system that collectively controls various in-vehicle electrical components with a microcomputer, but electromagnetic waves generated from various peripheral devices and alternators in the vehicle cause malfunction of the computer. The point is the problem. Therefore, shielded wires are used in the engine system, the power supply system that is directly connected to the battery, and the signal system.

An (electromagnetic) induction prevention tape 30 shown in FIG. 6 is one in which an induction prevention body 33 is provided between a plurality of parallel conductors 31 insulated by an internal insulation body 32. Is made of a conductive resin having a volume resistance of 10 ⁻² to 10 ⁴ Ω · cm (JP-A-4-4518).

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

The guide tape 30 shown in FIG. 6 uses a conductive resin as a shield layer. However, the current conductive resin has a conductivity less than one-thousandth of that of metal, and a sufficient shielding effect can be obtained. There wasn't. Further, the shield tape electric wire 35 of FIG. 7 has a structure in which the metal foil or metal mesh and the drain wire 39 are connected to the shield layer 40 with an adhesive, but the contact between the metal foil and the drain wire is partial. , Durability is poor against external force such as bending, and electrical connection becomes unstable.

[0006]

[Problems to be solved by the device]

 Therefore, an object of the present invention is to provide a shielded laminated electric wire that has durability against external force such as bending and has a blunt electromagnetic shield property.

[0007]

[Means for Solving the Problems]

 As for the above-mentioned subject, as described in claim 1, a drain wire is installed side by side at an appropriate interval on the side of a laminated electric wire formed by providing an insulating layer on the outer periphery of the laminated conductor in which a plurality of band-shaped conductors are laminated. Then, both sides of the drain wire and the laminated electric wire are covered with a shielding composite sheet constituted by laminating a conductive hot-melt resin layer and a metal foil, and an outer insulating layer is provided on the outer periphery thereof. . The laminated electric wire is formed to be bendable with respect to the laminated surface as described in claim 2, but may be formed as a rigid body as a whole (claim 3).

[0008]

[Action]

 Since the shielded laminated electric wire of the present invention has a structure in which the inner conductor is formed by laminating a plurality of strip conductors (or rectangular conductors), each strip conductor can slide with respect to bending and is easily bent. In addition, since the laminated wire and drain wire are covered with a shielding composite sheet with high conductivity, it has an excellent electromagnetic shield effect, and the drain wire and laminated wire are fixed by the conductive hot-melt resin layer of the composite sheet. Therefore, it has good bending resistance and stable electrical connection. Further, by constructing the laminated electric wire as a rigid body, it can be used as a connecting fitting for electric equipment such as a battery.

[0009]

【Example】

 In FIGS. 1 and 2, reference numeral 1 denotes a laminated shielded electric wire, in which an insulating layer 3 is provided on the outer periphery of a laminated conductor in which a plurality of strip-shaped conductors 2 are laminated to form a laminated electric wire 4. The drain wire 5 and the laminated electric wire 4 are covered with the composite wire 8 for shielding formed by laminating the conductive hot-melt resin layer 6 and the metal foil 7 on the both surfaces of the drain wire 5 and the laminated electric wire 4. In addition, it has a structure in which an outer insulating layer 9 is further provided on the outer periphery thereof.

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

In the present invention, the metal foil 7 constituting the shielding composite sheet 8 is preferably, for example, aluminum foil, and the conductive hot-melt resin layer 6 is provided on at least one surface thereof. The conductive hot-melt resin layer 6 is made of so-called hot melt as a base material, and if necessary, additives such as a tackifier, a plasticizer and an anti-aging agent are mixed therein, and the particle diameter is 10 μm or less (of carbon fiber). In this case, 30 to 100 parts by weight of a conductive filler having a length of 50 μm or less) is mixed and dispersed.

Examples of hot melts include polyvinyl chloride (PVC), polybutylene terephthalate (PBT), polyethylene (PE), polypropylene (PP), ethylene ethyl acrylate (EEA) and ethylene vinyl acrylate (EVA). Thermoplastic resins, nitrile butadiene rubber (NBR), synthetic rubbers such as ethylene propylene diene monomer (EPDM), and the like. Examples of the conductive filler include metal powder such as Ni, Cu, Al, Au, Ag and SUS, fibers and flakes, and also natural or artificial graphite, carbonaceous whiskers, carbon fibers, carbon black and the like.

Since the drain wire 5 is securely fixed together with the laminated electric wire 4 from the upper and lower surfaces by welding the conductive hot-melt resin layers 6 and 6 of the shielding composite sheets 8 and 8, a stable electrical connection state can be obtained. Further, since the laminated electric wire 4 is formed by stacking a plurality of strip-shaped conductors 2, the flexible strip-shaped conductor 2 of each layer slides when an external force such as bending acts on the surface, so that the strip-shaped conductor 2 is bent without difficulty. To do.

Test Example Fifteen rectangular copper wires having a width of 20 mm and a thickness of 130 μm are laminated as the strip conductors shown in FIGS. 1 and 2, and an insulating layer 3 of polyvinyl chloride having a thickness of 25 μm is provided on the outer periphery thereof. Thus, the laminated electric wire 4 was formed. In a state in which 0.3 mm ² copper wires are arranged as drain wires 5 at a distance of 5 mm from the laminated electric wire 4 and covered with the following three types of shielding sheets A to C (150 mm × 150 mm × 20 μm) from the upper and lower surfaces, A shielded laminated electric wire having a polyvinyl chloride outer insulating layer 9 having a thickness of 25 μm further provided on the outer periphery thereof was produced, and the shielding effect in a near electric field was compared by the KEC method.

[Composite Sheet A for Shielding] (Invention): 30% by weight of conductive carbon black is blended with EVA, and this is dissolved in toluene to form a paint, which is applied to an Al foil of 10 μm to obtain a conductivity of 10 μm. A composite sheet A for shielding having a heat-meltable resin layer formed thereon was produced. The specific resistance (ρ) of this conductive hot-melt resin is 7 × 10 ⁻¹ Ω · cm. [Composite Sheet B for Shielding] (Comparative Test Example 1): Same as the composite sheet A for shielding except that EVA containing no conductive filler was applied in a thickness of 10 μm instead of the conductive hot-melt resin layer. [Shielding Sheet C] (Comparative Test Example 2): A sheet having a thickness of 20 μm made of the conductive hot-melt resin of Sheet A without using Al foil.

The obtained results 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 clear.

FIG. 3 is an explanatory diagram of 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 shielded laminated electric wire 11 is formed as a rigid shield connecting fitting. That is, 12 is a strip-shaped conductor made of a hard copper flat plate having a thickness of about 0.1 mm, and a plurality of the strip-shaped conductors 12 are stacked and bent to form an inverted V-shaped curved portion 12A at the center, and stacked. Both ends of the strip-shaped conductor 12 are fixed by soldering or the like.

An insulating layer 13 is provided on the outer periphery of the curved portion 12A, and both inner and outer surfaces thereof are covered with a shield 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 further provided on the outer periphery thereof, and bolt insertion holes 20 are provided in the exposed laminated conductor portions 12B at both ends. Since the insulating layers 13 and 19 and the conductive hot-melt resin layer 16 are the same as those in the first embodiment, their description will be omitted.

FIG. 5 shows an example of use of the shield connecting fitting 11, where 21 is a battery and 22 is a bolt as a battery post. By using the shield connecting fitting 11 of the present invention, the two batteries 21, 21 are fastened and fixed with washers 23, nuts 24, and the drain wire 15 is connected to the ground (not shown). Due to its excellent electromagnetic shielding effect. Interfering radio waves from the outside world are prevented from being mixed into the battery 21.

[0020]

[Effect of device]

 The shielded laminated electric wire of the present invention has a drain wire formed by arranging a drain wire side by side at an appropriate interval on the side of the laminated electric wire formed by providing an insulating layer on the outer periphery of the laminated conductor formed by laminating a plurality of strip conductors. Both sides of the laminated electric wire are covered with a composite sheet for shielding, which is composed by laminating a conductive hot-melt resin layer and a metal foil, and an external insulating layer is provided on both sides of the laminated electric wire. It has an excellent shielding effect, and the laminated wire can be made flexible or rigid depending on the purpose of use, and it can be used as a flexible shielded wire or as a shielded metal fitting with rigidity. Can be used.

[Brief description of drawings]

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

2 is a cross-sectional view of FIG.

FIG. 3 is an explanatory view of a process of forming a shielded laminated electric wire showing another embodiment of the present invention.

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

5 is an explanatory diagram of a method of using the shield laminated electric wire of FIG.

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]

 1,11 Shield laminated electric wire 2,12 Band 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 Shield composite sheet 9,19 External insulating layer

Claims (3)

[Scope of utility model registration request] 1. A drain wire is provided side by side at an appropriate interval on a side of a laminated electric wire formed by providing an insulating layer on the outer periphery of the laminated conductor formed by laminating a plurality of strip conductors, and both sides of the drain wire and the laminated electric wire are arranged. A shielded laminated electric wire comprising: a composite sheet for shielding formed by laminating a conductive hot-melt resin layer and a metal foil, and an outer insulating layer provided on the outer periphery thereof. 2. The shield laminated electric wire according to claim 1, wherein the laminated electric wire is formed so as to be bendable with respect to a laminated surface. 3. The shield laminated electric wire according to claim 1, wherein the laminated electric wire is formed as a rigid body as a whole.