JP2580413Y2 - Insulated wires and coaxial cables - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an insulated wire using a coating layer made of a porous ethylene tetrafluoride resin (hereinafter, referred to as EPTFE) and a polyetheretherketone resin (hereinafter, referred to as PEEK). The present invention relates to a coaxial cable having this insulated wire as a core.

[0002]

2. Description of the Related Art PEEK has high mechanical strength and is suitable for trauma resistance, abrasion resistance, heat aging resistance, low temperature resistance, heat resistance, chemical resistance, radiation resistance, flame resistance, light weight, etc. It is used for coating insulated wires because it has excellent properties such as low smoke and no harmful gas generated by combustion. Conventionally, for example, Japanese Utility Model Application Laid-Open No. 58-37617,
JP-A-3-182410 and JP-A-2-27611
As described in Japanese Patent Application Laid-Open Publication No. H11-260, there has been proposed an insulated wire having two or more insulating coatings by applying a heat-resistant organic resin layer around a conductor and extruding this PEEK thereon. This is because even if cracks or cracks occur in the PEEK coating layer due to bending or the like, the heat-resistant organic resin layer can ensure insulation properties and prevent dielectric breakdown under high voltage.

[0003]

[Problems to be Solved by the Invention] However, in these insulated wires coated with PEEK, the following (a) to (d)
There is a problem. (a) Since these insulated wires require two or more inner and outer insulating coating steps, there is a problem that the manufacturing cost is increased. (b) The above-mentioned heat-resistant organic resin layer is a solid resin, and is not preferable in terms of weight when pursuing weight reduction of, for example, electric wires and cables for aircraft. (c) Since the outer PEEK layer is provided by melt extrusion of PEEK whose thickness is difficult to reduce, the insulated wire having the relatively thick PEEK layer must be hardened. Therefore, these insulated wires have poor workability and poor workability. (d) When such an insulated wire is used for a core of a coaxial cable, it is difficult to greatly reduce the propagation delay time of the coaxial cable because the heat-resistant organic resin layer is a solid resin. Therefore, due to the high price of PEEK, it is only used in small amounts for special purposes.

[0004] The present invention has been made in view of the above-mentioned prior art, and is based on PEEK.
The insulation coating process can be completed only once using
Moreover, it is an object of the present invention to provide an insulated wire and a coaxial cable having characteristics such as light weight, flexibility, good workability, and low dielectric constant. The coaxial cable includes a semi-rigid cable.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and this insulated wire is made of EPTF.
A tape material obtained by laminating an E film and a PEEK film is helically or cylindrically wound around a conductor so that a part of the tape material overlaps, and the overlapping tape materials are melted and integrated. It is characterized by the following. In a coaxial cable, a tape material obtained by laminating an EPTFE film and a PEEK film is spirally or cylindrically wound around a conductor so that a part of the tape material overlaps, and the tape material between the overlapping tape materials is formed. A core made of an insulated wire formed by melting and integrating
It is characterized by comprising an outer conductor provided on the outer periphery of the core and a jacket provided on the outer periphery of the outer conductor.

[0006]

The insulated wire according to the present invention has an EP around the conductor.
A tape material obtained by laminating a TFE film and a PEEK film is spirally or cylindrically wound so that a part of the tape material overlaps, and the wound material is heated to melt and integrate the PEEK film between the overlapping tape materials. Therefore, the insulating coating process can be performed only once, productivity is remarkably improved, and the manufacturing cost is greatly reduced.

The tape material of this insulated wire is made of EP
Since the TFE film has a porous portion, it is lightened, and since PEEK as a reinforcing layer of the EPTFE is in the form of a film, the weight of the insulated wire is extremely reduced. Is suitable.

In addition, since the EPTFE film has continuous pores, the PEEK film heated and melted in the pores partially penetrates and solidifies to produce an anchor effect, so that the overlapping tape materials are strongly integrated. In addition, the insulated wire has a thin PEEK layer and a flexible EPTFE film between them, so that the insulated wire is rich in flexibility and good in workability.

Further, in the coaxial cable having the insulated wire as a core, the relative dielectric constant of one or both of the EPTFE film and the PEEK film can be set to 1.3 to 2 by appropriately selecting the physical properties and the thickness. .1 can be adjusted as desired. Moreover, even when such an insulating coating layer having a low dielectric constant is compressed by, for example, an external conductor provided around the insulating coating layer, the PEEK film portion having high mechanical strength exhibits a protective function,
This prevents the porous portion of the insulating coating layer from being broken, thereby preventing the dielectric constant from increasing. As a result, a coaxial cable having an insulating coating (dielectric) layer having a low dielectric constant can be obtained, whereby the transmission characteristics are stabilized more than, for example, a conventional coaxial cable using only EPTFE as the dielectric. You.

[0010] The insulating coating layer of the insulated wire preferably has a high mechanical strength, trauma resistance, cut-through resistance, abrasion resistance, since a PEEK film is present in the outermost layer or the intermediate layer. It has properties of heat aging resistance, low temperature resistance, heat resistance, chemical resistance, flame retardancy, and low smoke emission.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an insulated wire and a coaxial cable according to the present invention will be described below with reference to the drawings. First, FIG. 1 is a cross-sectional view showing an embodiment of the insulated wire according to the present invention.
Here, the description will be made with reference to FIG.
It extends from the near side to the far side as viewed in the figure.
A tape material obtained by laminating the TFE film 2a and the PEEK film 3a is spirally or cylindrically wound around the conductor 4a so that a part of the tape material forms an overlapping portion. The insulating coating layer is formed by heat melting and integrating. In the insulated wire 1a, since the PEEK film 3a is in the outermost layer, the properties of high mechanical strength, trauma resistance, cut-through resistance, and abrasion resistance are effectively exhibited. Also, even if an external force is applied to the insulated wire, the insulating coating layer is protected by the PEEK film 3a, so that the porous pores of the EPTFE film 2a are held without being crushed, and the dielectric strength of the wound insulating coating layer is maintained. It is possible to prevent an increase in the rate, maintain a low dielectric constant, and stabilize transmission characteristics.

The insulated wire 1a is made of, for example, an 80 μm-thick EPTFE film 2a having continuous pores whose dielectric constant is reduced by a method such as stretching, and a thickness of 7 μm.
A μm PEEK film 3a was used. In addition, in this insulated wire, the PEEK film 3a does not shrink or the shrinkage of the EPTFE film 2a slightly.
By heating and melting at a temperature equal to or higher than the melting point of (a) (334 ° C.), the insulating coating is formed integrally. In this insulated wire 1a, the EPTFE film 2a and the PEEK film 3a are not integrated before being wound around the conductor 4a. Further, the number of the PEEK films 3a can be two or more. Further, as the tape material, a laminated tape material obtained by laminating a PEEK film 3a on one side of an EPTFE film 2a, melting by heating and integrating is used.
The above-mentioned insulated wire 1a can also be manufactured by winding spirally or cylindrically around a, and melting and integrating the overlapping tape materials by heating.

FIG. 2 is a cross-sectional view showing another embodiment of the insulated wire according to the present invention. The insulated wire 1b extends from the near side to the far side as viewed in the drawing.
A tape material obtained by laminating the FE film 2b and the PEEK film 3b is spirally or cylindrically wound around the conductor 4b so that a part thereof forms an overlapping portion. The insulating coating layer is formed by heat melting and integrating. In this insulated wire 1b, the PEEK film 3b in the middle layer of the insulating coating layer protects the EPTFE film 2b inside it, and the EPTFE film 2b in the outermost layer has cushioning properties. The use of a laminate tape material and the use of two or more PEEK films 3b can be performed in the same manner as in the above-described embodiment.

FIG. 3 is a cross-sectional view showing one embodiment of the coaxial cable according to the present invention. Referring to FIG.
The coaxial cable 5 uses the insulated wire 1a described in FIG. That is, the core 6 is an EPT
A tape material obtained by laminating the FE film 2a and the PEEK film 3a is spirally or cylindrically wound around the conductor 4a so that a part thereof overlaps to form an overlap portion, and the PEEK film of the overlap portion is formed. 3a is heated and melted and integrated to form an insulating coating layer (dielectric layer). An outer conductor layer 7 is provided around the core 6 and, if necessary, a jacket layer 8 is provided around the outer conductor layer 7.
Is provided. The outer conductor layer 7 is, for example, a braided or horizontally wound conductive linear body such as a metal, a spirally or tubularly wound conductive foil, or a conductive tubular body. Is used. The measured propagation delay time Tr of the coaxial cable 5 was 3.84 nanoseconds / m, and the transmission characteristics were stable. When calculated from the value of the propagation delay time Tr, the relative permittivity εr of the insulating coating, that is, the dielectric was 1.33. Further, in the coaxial cable 5, a coaxial cable (not shown) using the insulated wire 1b as a core can be used.

The present invention is not limited to the above embodiment. For example, the insulating coating layer of the insulated wire and the coaxial cable may be made of an EPTFE film or a PEEK film having a different thickness from the above, and the winding direction may be reversed. , Increase or decrease the number of turns, EPTFE film and PE
Various changes are possible within the technical concept of the present invention, such as winding a tape material in which a plurality of sets with an EK film are alternately laminated.

[0016]

[Effects of the Invention] As described above, according to the present invention,
Even when PEEK is used, only one insulation coating step of the insulated wire is required, so that the productivity is significantly improved and the production cost is greatly reduced. In addition, this insulated wire has high mechanical strength, scratch resistance, cut-through resistance, abrasion resistance, heat aging,
It has excellent properties such as low temperature resistance, heat resistance, chemical resistance, radiation resistance, flame resistance, low smoke emission, light weight, flexibility, and good workability. Further, in a coaxial cable having this insulated wire as a core, the insulating coating (dielectric) layer can be stably maintained at a low dielectric constant by the PEEK film.
Signal propagation delay time is shorter than that of a conventional coaxial cable, and stable transmission characteristics can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of an insulated wire according to the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the insulated wire according to the present invention.

FIG. 3 is a cross-sectional view showing one embodiment of the coaxial cable according to the present invention;

[Explanation of symbols]

1a, 1b insulated wires 2a, 2b porous tetrafluoroethylene resin (EPTF
E) Film 3a, 3b Polyetheretherketone resin (PE
EK) film 4a, 4b conductor 5 coaxial cable 6 core 7 outer conductor layer 8 jacket layer

Claims (2)

(57) [Scope of request for utility model registration] 1. A tape material obtained by laminating a porous tetrafluoroethylene resin film and a polyetheretherketone resin film in a spiral or cylindrical shape around a conductor so that a part of the tape material overlaps. An insulated wire, wherein the insulated wire is wound and fused between the overlapping tape materials. 2. A tape material obtained by laminating a porous tetrafluoroethylene resin film and a polyetheretherketone resin film in a spiral or cylindrical shape around a conductor so that a part of the tape material overlaps. A coaxial coil comprising: a core made of an insulated wire formed by winding and melting and integrating the overlapping tape materials; an outer conductor provided on an outer periphery of the core; and a jacket provided on an outer periphery of the outer conductor. cable.