JPH0359910A - Wire for electronic device - Google Patents

Abstract

PURPOSE:To obtain a wire for an electronic device enabling the high substantial porosity to be easily obtained while having excellent mechanical strength and unified quality by arranging a tubular body consisting of an insulating material about a central conductor coaxially arranging external conductors to central conductors in the outside thereof. CONSTITUTION:External conductors 3 coaxially arranged with central conductors 1 outside an insulating layer consisting of tubular bodies 2 consist of closed or mesh conductors of copper and such. In this case, tubular bodies 2 consisting of an insulating material are arranged between the central conductors 1 and external conductors 3 are arranged. Accordingly, hollow parts 2a of the sam tubular bodies 2 become a part of the insulating layer 5. Consequently, by properly selecting a material of the tubular bodies 2 and a substantial hole coefficient, a desired execution dielectric constant epsilon can be set up. Further, since the execution layer 5 is formed of a gap 6 between the hollow parts 2a of the tubular bodies 2 and the tubular bodies so that the insulating layer 5 always secures a fixed volume. Thereby, high porosity can be easily obtained while obtaining a wire for an electronic device excellent in mechanical strength and having uniform quality.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electric wire for electronic equipment used as a signal transmission path of electronic equipment such as computers and their peripheral equipment.

(Prior Art) With the advanced development of electronic devices such as computers and their peripheral devices, high performance and highly reliable electric wires for electronic devices such as electric wires and cables used in this field are required. ing. In particular, there is a strong demand for something with less transmission energy loss (lower loss) and a faster signal transmission speed (higher speed). In order to satisfy these requirements, it is essential to provide voids or pores in the insulating layer to further reduce its effective dielectric constant ε.

Therefore, in order to reduce loss and increase speed in conventional electrical wires for electronic devices, plastic disks C are attached at appropriate intervals along the outer circumference of the center conductor A in the longitudinal direction as shown in Fig. 6. In some cases, an outer conductor B is disposed coaxially with the center conductor A, and a desired internal gap E is provided between the center conductor A and the outer conductor B.

Also, as shown in Figure 7, polyethylene is placed on the outside of the center conductor A.
An insulating layer made of highly foamed plastic such as polypropylene, PFA, or PTFE is formed, and an outer conductor B is placed on the outside.
There is also one in which the conductor A is arranged coaxially with the center conductor A.

(Problems to be Solved by the Invention) However, conventional electric wires for electronic devices have the following problems.

■ In the electric wire for electronic equipment shown in Figure 6, if you try to obtain a porosity of 60% or more, the mechanical strength such as tensile strength, bending strength, and bending strength of the porosity becomes weak, making it difficult to maintain the same strength as a normal cable. It becomes difficult to handle.

■ In the electric wire for electronic equipment shown in Figure 7, if the foamed plastic insulator is forced to increase the foaming rate to 60% or more, the bubbles will bond with each other and the bubble diameter will increase, making it difficult to resist external stress. As the foaming rate becomes easier, the foaming rate becomes unstable and the uniformity in the longitudinal direction is gradually lost.

(Objective of the Invention) An object of the present invention is to provide an electric wire for electronic devices that can easily obtain a high effective porosity, has excellent mechanical strength, and has uniform quality.

(Means for Solving the Problems) The electric wire for electronic equipment of the present invention has a central conductor 1 as shown in FIG.
A tubular body 2 made of an insulating material is disposed around the central conductor 1, and an outer conductor 3 is disposed coaxially with the central conductor 1.

The center conductor 1 is made of a single core or stranded wire made of copper, aluminum, etc., with or without plating with tin, nickel, silver, etc.

The tubular body 2 disposed around the center conductor 1 and forming the insulating layer 5 shown in FIG. ), polyolefins (polyethylene, etc.), fluororesins (PFA etc.), polyamides (6,
(6-nylon, etc.), polyesters, polycarbonates, polyarylates, and other plastics.

This tubular body 2 is wrapped around the central conductor 1 by wrapping one or more of them around the central conductor 1 as shown in FIG. have it arranged.

This tubular body 2 has a substantial hollowness ratio (cross-sectional area ratio of outer diameter to inner diameter)
Using 60% or more, preferably 80% or more,
Substantial porosity of the insulating layer 5 (hollow part 2a of the tubular body 2 in FIG.
and the volume of the pores 6 between the tubular body 2/volume of the insulating layer 5) 60
% or more is desirable.

The outer conductor 3, which is disposed coaxially with the center conductor 1 outside the insulating layer made of the tubular body 2, is made of copper, aluminum, etc. with or without plating with tin, nickel, silver, etc. It is made of horizontally wound or braided conductor wire, aluminum or copper metal foil, or a combination of these with resin tape, such as PET laminate tape.

(Function) In the electric wire for electronic equipment of the present invention, the center conductor l and the outer conductor 3
Since the tubular body 2 made of an insulating material is provided between the two, the hollow portion 2a of the tubular body 2 becomes a part of the insulating layer 5. Therefore, by appropriately selecting the material and substantial hollowness ratio of the tubular body 2, a desired effective dielectric constant ε can be set.

Furthermore, in the electric wire for electronic equipment of the present invention, the insulating layer 5 is formed by the hollow part 2a of the tubular body 2 and the gap (pore part) 6 between the tubular bodies 2, as shown in FIG. 1, so that the insulating layer 5 is always constant. The volume is guaranteed to be .

(Example) FIGS. 1 to 4 show various examples of the electric wire for electronic equipment of the present invention.

Among these embodiments, the electric wire for electronic equipment shown in FIG. 1 has a central conductor 1: a stranded wire of seven silver-plated annealed copper wires with an outer diameter of 0.10 mm, and a tubular body with a standard outer diameter of 0.30 mm. Outer diameter 0.
Outer conductor 3: 30 wires of silver-plated annealed copper wire with an outer diameter of 0.10 mm. A horizontally wound shield sheath 4 made of flexible PVC with a wall thickness of 0.5 mm. .

In the electric wire for electronic equipment shown in Fig. 2, center conductor 1: stranded wire made of seven silver-plated annealed copper wires with an outer diameter of 0.10 mm, standard outer diameter of 0.30 mm, and tubular body 2: outer diameter of 0.
19mm, inner diameter 0. 8 174mm PMMA tubular bodies
Genuine twisted thin tape 11: 5u thickness, 5mm width, PET tape 1/4
Wrap press winding outer conductor 3: outer diameter 0.08 m + y + silver plated annealed copper wire 2
9 horizontally wound shield sheath 4 Consists of a flexible polyvinyl chloride sheath with a wall thickness of 0.5 mm.

Next, in the electric wire for electronic equipment shown in Figure 3, center conductor 1: stranded wire made of seven silver-plated annealed copper wires with an outer diameter of 0.10 mm, standard outer diameter of 0.30 mm, and tubular body 2: outer diameter of 0.
．． 8 PMMA tubular bodies with a diameter of 19 mm and an inner diameter of 0.174 mm.
Genuine twisted adhesive 12 Acrylic ultraviolet curable resin outer conductor 3:
29 horizontally wound shield sheaths made of silver-plated annealed copper wire with an outer diameter of 0.08 mm4. Constructed from a flexible polyvinyl chloride sheath with a wall thickness of 0.5 mm.

Furthermore, in the electric wire for electronic equipment shown in Fig. 4, the center conductor 1 is a stranded wire of seven tin-plated annealed copper wires with an outer diameter of 0.10 mm, and the standard outer diameter is 0.30 mm, and the tubular body 2 has an outer diameter of 0.
．． Thin tape 11: 8μ thick, 5mm wide, 18 cellulose acetate tubular bodies of 30mm and 0.28mm inner diameter twisted together.
5 strands of tin-plated annealed copper wire 16-strand braided sheath 4. Constructed from a flexible polyvinyl chloride sheath with a wall thickness of 0.5 mm.

The electric wire for electronic equipment of the present invention is manufactured as shown in FIG. 5, for example.

First, using the twisting machine 20 shown in FIGS. 5a and 5b, the tubular bodies 2 are twisted around the outer periphery of the center conductor l at an appropriate pitch. In this twisting machine 20, the tubular body 2 is pulled out from the bobbin 21 as shown in Fig. 5, and at the same time, the twisting machine 20 rotates in the direction of the arrow in the figure to twist the tubular body 2 around the outer periphery of the center conductor l. It is like that.

Next, in order to improve the mechanical strength of the tubular body 2, tape 11 is attached to the outside of the tubular body 2 as shown in FIG.
Alternatively, as shown in FIG. 3, the gaps between the tubular bodies 2 may be filled with adhesive 12 to join the tubular bodies 2 together.

When wrapping with tape as described above, PE is placed on the outside of the tubular body 2.
A thin tape 11 made of T, paper, polyethylene, Teflon, etc. is pressed and wound by a tape winding machine 10 as shown in FIG. 5C.

When filling the adhesive 12, for example, an ultraviolet curable resin is used as the adhesive 12, and after filling the space between the tubular bodies 2 with this resin, a UV lamp 14, a reflecting mirror 15, etc. as shown in FIG. Ultraviolet curing resin curing device 1 consisting of
The resin is cured by step 3.

An outer conductor 3 is twisted around the outer periphery of the tubular body 2 wrapped with tape or filled with an ultraviolet curable resin using an outer conductor twisting machine 22 shown in FIGS. 5a and 5e.

It is preferable in terms of mass productivity and production cost to carry out the steps up to this point continuously in a series of equipment as shown in FIG. 5a.

Furthermore, a sheath 4 made of polyethylene, polyvinyl chloride, or the like is applied to the outside of the external conductor 3 using a common extruder to complete an electric wire for electronic equipment.

(Effects of the Invention) In the electric wire for electronic devices of the present invention, the hollow portion 2a of the tubular body 2 and the gap (pore portion) 6 between the tubular bodies 2 constitute the insulating layer 5, so that there are various effects as described below.

(2) By appropriately selecting the material and substantial hollowness ratio of the tubular body 2, it is possible to set a desired effective dielectric constant ε.

(2) The substantial hollowness of the tubular body 2 is 60% or more, preferably 8.
If it is 0% or more, an insulating layer 5 with a substantial porosity of 60% or more can be easily obtained.

■Since the tubular body 2 is used, it has excellent mechanical strength.
As long as the tubular body 2 is not crushed, the insulating layer 5 is reliably secured. Therefore, the outer conductor 3 is prevented from being misaligned or unwound, and moreover, uniform quality is ensured over the entire length of the product.

[Brief explanation of drawings]

Fig. 1a is a sectional view showing an embodiment of the electric wire for electronic equipment of the present invention, the figure is an explanatory diagram showing the structure of the electric wire, and Figs. 5A is an explanatory diagram showing the manufacturing process of the electric wire for electronic equipment of the present invention; FIG. 5C is an explanatory diagram of the tubular body twisting machine of FIG. Figure a is an explanatory diagram of the tape winding machine in Figure 0, Figure d is an explanatory diagram of the ultraviolet curing resin curing device in Figure a, Figure e is an explanatory diagram of the external conductor horizontal winding machine in Figure a, and Figure 6a is an illustration of the external conductor horizontal winding machine in Figure a. 7 is a cross-sectional view of a conventional plastic disk-type electric wire for electronic equipment, and FIG. 7 is a cross-sectional view taken along line A-A in FIG. l is the center conductor 2 is the tubular body 3 is the outer conductor

Claims (1)

[Claims] An electric wire for electronic equipment, characterized in that a tubular body 2 made of an insulating material is disposed around a central conductor 1, and an outer conductor 3 is disposed coaxially with the central conductor 1 on the outside thereof. .