JPS5866207A - Multicore shield wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a multi-core shielded wire.

A metal shield that has conventionally been commonly used as a conductor shield has a structure as shown in FIG. In Figure 1, 1 is a conductor, 2 is an insulator, and 3 is copper #! 4 is a jacket. Since this metal shield is expensive, research has been conducted into using conductive plastic as a lower cost shielding material, which has a structure as shown in FIG. In Figure 2, 5 is a conductor, 6 is an insulator, and 7
8 is a conductive plastic shield, 8 is a drain wire necessary to reduce the electrical % resistance in the length direction of the conductive plastic shield 7 and increase the conductivity, and 9 is a jacket.

However, with the structure shown in Figure 2, the price and processing cost of the conductive plastic itself are not very cheap, and the cost is added, and a drain wire is required, so the metal conductor is not completely unnecessary. The reality is that it is not widely used due to the lack of availability.

The present invention has been developed from the perspective of diagonal use, and its purpose is to provide a multi-core shielded wire that is low in cost and has good terminal processability.

The present invention will be explained in detail below with reference to the drawings.

FIG. 3 is a cross-sectional view of a conventional four-core shield wire, FIG. Cross-sectional views of wires, FIGS. 6 to 9 are cross-sectional views showing various types of multi-core shield wires.

In Figure 3, 10 is a metal-shielded insulated conductor, and conductor 1
An insulating sheath 12 is provided on the outside of the shield 1, and a metal shield 1 having a horizontally wound or braided structure made of copper wire is provided on the outside 111.
3 are arranged in close contact with each other. A jacket 14 is coated on the outside of a combination of four metal-shielded insulated conductors 1o.

In FIG. 4, reference numeral 15 denotes an insulated conductor with a metal shield, and an insulating sheath 17 is provided on the outside of the conductor 16, and a metal shield 18 with a horizontally wound or braided copper wire structure is provided on the outside of the conductor 16.
are arranged in close contact with each other.

Reference numeral 19 designates the conductor 2 (l), which is an insulated conductor that is only provided with an insulated contact 21 and is not metal-shielded.

Two metal shielded insulated conductors 15.15 are placed in contact with each other, and one unshielded gold bullion insulated conductor 19.19 is arranged on each side of the insulated conductors 15.15, and a conductive plastic conductor is placed on the outside. A sheath 22 that shields and covers the wire is provided with a two-layer structure having an annular cross section including a plastic shield layer 23 made of plastic and a jacket layer 24 made of non-conductive plastic on the outside thereof.

Note that the two metal shielded insulated conductors 15.15 are each in contact with the plastic shield layer 23.

As a result, the two metal shields 18, 18 act as drain wires for the plastic shield layer 23, the electrical conductivity of the plastic shield layer 23 is increased and this shielding effect is enhanced, and the non-metal shielded insulated conductors 19, 19 are Shielded by a metal shield 18.18 and a plastic shield layer 23.

This four-core shield wire is equivalent to the conventional four-core shield wire shown in FIG. 3, and the thickness of the sheath 22 is approximately the same as the thickness of the jacket 14 in FIG. The conventional four-core shielded wire shown in FIG. 3 has many uses, and is used, for example, in EIAJ standard HA-1 (method for connecting recording and reproducing equipment). However, in this case, 2 of the 4 hearts are used at a high level and the other 2 hearts are used at a low level, so only 2 hearts need a #summer shield, and the remaining 2 hearts can be used with a simple shield. This is sufficient, and the structure of the four-core shielded wire shown in FIG. 4 is most suitable for this type of application. Even if the conductivity of the plastic shield layer is lower than that of the metal shield, practically sufficient characteristics can be obtained, the cost will be lower by 20% or more, and the terminal processing will be easier.

Next, referring to Fig. 5, 25 is an insulated conductor with a metal shield, 26 is an insulated conductor without a metal shield, and 31 is a sheath, and these components are the same as those described in Fig. 4. Therefore, detailed explanation will be omitted.

Reference numeral 27 denotes an insulated conductor which is separately shielded with a conductive plastic, in which a 4% insulation coating 29 is applied to the outside of the conductor 28, and a conductive plastic shield 30 is coated on the outside.

The metal-shielded insulated conductor 25 and the separately conductive plastic-shielded insulated conductor 27 are brought into contact with each other, and both shielded insulated conductors 25.2 are brought into contact with each other.
7 are each in contact with the plastic sheet layer 32,
Insulated conductors 26.26 that are not metal-shielded are placed inside the sheath 31 on both sides of both shielded insulated conductors 25.27.

As a result, the metal shield of the metal shielded insulated conductor 25 acts as a drain wire for the plastic shield layer 32 and a separate plastic shield 30;
In the case of a low core level, there is no practical problem with such a configuration, and the cost can be reduced and the terminal processing becomes easier.

Next, FIGS. 6 to 9 will be explained.

In each figure, 33, 37, 41, 45 are insulated conductors with metal shielding, 34, 38, 42, 46 are insulated conductors that are not entirely shielded, and 35, 39, 43, 47 are sheaths.

FIG. 6 shows a two-core shielded wire in which a metal-shielded insulated conductor 33 and an unmetallic-shielded insulated conductor 34 are brought into contact with each other and are surrounded by a plastic shield layer 36 of a sheath 35 without any gaps. The figure shows a two-core shield wire in which a sheath 39 is applied so that the plastic shield layer 4o covers the insulated conductors 37 and 38 without any gaps.

FIG. 8 shows one metal-shielded insulated conductor 41 and both 11Jk non-metal-shielded insulated conductors 42.42.
This is a three-core shielded wire in which a sheath 43 with an oval cross section is provided on the outside so that the metal-shielded insulated conductor contacts the plastic shield layer 44.

FIG. 9 shows one metal shielded insulated conductor 45,
Two insulated conductors that are not metal-shielded are assembled so that the distance between the three cores is approximately the same, and the insulated conductor 45 that is metal-shielded is in direct contact with the plastic shield layer 48 on the outside. It is a three-core shielded wire in which a sheath 47 having a substantially circular cross section is provided.

In these examples, one insulated conductor with a metal shield and two insulated conductors without a metal shield are combined, but it is also possible to do the opposite, that is, a combination of two of the former and one of the latter. It is possible.

It goes without saying that any of the configurations shown in Figures 6 to 9 above exhibits a shielding effect, and by adopting these configurations, costs can be lowered and terminal processing becomes easier. be. Although the diagram is omitted, there is one insulated conductor with a metal shield inside the sheath, an insulated conductor with a separate conductive plastic shield, and a full area shield and a separate conductive plastic shield. A plurality of insulated conductors each containing a metal shield and a plurality of separately conductive plastic shielded insulated conductors in contact with each other, a metal shield and a plurality of separate conductive plastic shields, or a plurality of separate conductive plastic shields. Only the conductive plastic shield of the plastic shield is in contact with the plastic shield layer, and the metal shield acts as a drain wire for the plastic shield layer and any separate conductive plastic shields, and the plastic shield layer and any separate plastic shields are connected. In order to increase the shielding effect of A conductive plastic shield and a plastic shield layer provided, a conductive plastic shield provided separately from a metal shield, a conductive plastic shield and a plastic shield layer provided separately from a metal shield, or a conductive plastic provided separately from a metal shield. Multi-conductor shielded wires shielded by any of the shields are also possible.

Since the present invention is constructed in a diagonal manner, it is possible to provide a multi-core shielded wire with good terminal processability at low cost.

Note that the configuration of the present invention is not limited to the diagonal embodiment, but can be freely modified within the scope of the purpose of the present invention, and the present invention encompasses all of these.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a conventionally used metal shielded wire, Figure 2 is a cross-sectional view of a conventionally used conductive plastic shielded wire, and Figure 3 is a cross-sectional view of a conventional four-core shielded wire. 6 to 9 are cross-sectional views showing a six birch multi-core shield wire. 22.31.35.39.43.47... Sheath 15
．． 25.33.37.41.45...Insulated conductor with metal shield 19.26.34.38.42.46...Insulated conductor without metal shield Figure 1 Figure 21Me 1 Figure 4 3 diagram

Claims (1)

[Claims] 1) A conductor having an insulating coating and a metal shield (hereinafter simply referred to as a metal-shielded insulated conductor), and a conductor having an insulation coating but without a metal shield (hereinafter simply referred to as a metal-shielded insulated conductor). A two-layered sheath with a plastic shield layer made of conductive glass on the inside and a jacket layer made of non-conductive glass on the outside. A multi-core shielded wire that is characterized by 2) One metal-shielded insulated conductor and one non-metal-shielded insulated conductor are arranged in parallel, and the outside pressure is such that the plastic shield layer extending inside the sheath connects the side conductor without any gaps. 2. A two-core shielded wire according to claim 1, further comprising a sheath covering the wire. 3) The cross-sectional shape of the sheath is oval, and one metal-shielded insulator is installed in the center of the sheath,
Claim 1, wherein the metal shield is brought into contact with the inner wall of the plastic shield layer, and one insulated conductor that is not metal-shielded is installed on each side of the metal-shielded insulated conductor. shield wire. 4) The cross-sectional shape of the sheath is circular, and the distance between the three cores is approximately the same as the one metal-shielded insulated conductor and the two shielded insulated conductors. 2. The three-core shielded wire according to claim 1, wherein the metal-shielded insulated conductor is placed in the sheath and is brought into contact with the plastic shield layer in a line so as to be equal to each other. 5) The sheath has a circular cross-sectional shape, and two metal-shielded insulated conductors that are in contact with each other are installed inside the sheath, and the metal shield of each side conductor is in contact with the inner wall of the plastic shield layer. A four-conductor shielded wire according to claim 1, comprising one insulated conductor that is not metal-shielded on each side of a side conductor. 6) The sheath has a circular cross-sectional shape, and the metal-shielded insulated conductor and the separately conductive plastic-shielded insulated conductor are placed inside the sheath in contact with each other, and each side a conductor metal shield;
The four-core structure according to claim 1, wherein a conductive plastic is brought into contact with the inner wall of the plastic shield layer, and one insulated conductor without a metal shield or conductive plastic shield is provided on each side of the side conductor. shield wire. 7) One insulated conductor with a metal shield inside the upper Nr” sheath, an insulated conductor with a separate conductive plastic shield, and an insulated conductor with neither a metal shield nor a separate conductive plastic shield. Each conductor has a plurality of conductors inside, and the metal shield of the metal-shielded insulated conductor, the conductive plastic shield of the separately conductive plastic-shielded insulated conductor, and the plastic shield layer of the sheath are electrically connected and conductive. 8) A conductive plastic wire in which an insulated conductor that is neither the metal shield nor the separate conductive plastic shield is provided separately from the metal shield. Seals include a conductive plastic shield and plastic shield layer separate from the metal shield, a conductive plastic shield separate from the metal shield, only a separate conductive plastic shield, or a separate conductive plastic shield. The multi-core shield wire according to claim 7, which is shielded by either K of a shield and a plastic shield layer.