JPS63119112A - Transmission path wire - Google Patents

Abstract

An electrical transmission wire consisting of a single or a twisted pair of wires has the effective electrical diameter of the primary conductor increased by wrapping conductive foil (2), or conductive foil (2) laminated to a substrate layer (1), on to a primary conductor (3) with a diameter less than 20 mils (0.508mm), the foil being in contact with the conductor. An outer insulating cover (4) may be applied over the wrapped wire. The conductive wrapping can be a spiral wrapping or a longitudinal wrapping around the electrical conductor. A desired characteristic impedance along the length of the wire(s) can be achieved with easy removal of the wire covering for standard termination and increased cut-through resistance.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a transmission system in which a predetermined characteristic impedance can be obtained by increasing the effective cross-sectional area of a center conductor, and in which the terminals are connected by ordinary terminal processing means. Concerning street power lines.

The transmission line electric wire according to the present invention is particularly effective for solderless wrapping connection to printed circuit boards, etc., and for interconnection of single wires, double-stranded wires, and the like.

[Conventional technology]

Conventionally, normal terminal processing means could not be used for transmission lines with low impedance of 100 ohms or less. Typically, 20 mil or larger conductors had to be used to obtain low characteristic impedance. In order not to increase the characteristic impedance, only a thin layer of insulation could be wrapped around the core wire. Therefore, only a thin insulating coating can be used, the cut-through resistance is low, and the coating is difficult to peel off.

In order to supplement the cut-through resistance and abrasion resistance of this thin insulation coating, this problem was solved by providing an additional protective sheath around the outer periphery of the insulation coating.

However, the transmission line with this solution brought about the annoyance of having to remove the protective sheath when processing the terminal.The problem was that the core wire was often damaged by the processing blade during the removal process of this protective sheath. There was a point.

Therefore, it has been desired to develop a transmission line with low impedance (Z, = t (less than 10 ohms)) that can use existing terminal processing means.

[The point of view while the invention is trying to solve the problem]

The present invention was made in view of these drawbacks, and aims to provide a low-impedance transmission line in which existing terminal processing means can be used as is.

[Means for solving problems]

In order to solve the problems of the prior art, the present invention includes a core wire, at least one layer of conductive material wound around the outer periphery of the core wire, and a total outer diameter of 0 between the core wire and the outer periphery of the conductive material. ．．
The transmission line electric wire is further provided with at least one insulating layer so as to have a thickness of 508 mm (20 mils) or less.

Thus, according to the present invention, the effective outer diameter of the core wire is increased. This increase in outer diameter can be achieved by making a conductive material or a layer of conductive material laminated on a base material layer so that the conductive material is in contact with the core wire, and the outer diameter is 0.508 mm (20 mils) or less. This is achieved by wrapping it around the outer circumference of the wire. The insulation layer jacket is
It is then applied from the outside of the core wire and conductive material. The conductive material or conductive laminate is applied to the outer periphery of the core wire by horizontal or vertical wrapping.

[Effect]

According to this invention, it is possible to obtain a desired characteristic impedance along the longitudinal direction of the electric wire, to easily remove it and perform standard terminal treatment, and to increase the cut-through resistance.

Further, according to the present invention, since at least one layer of conductive material is electrically connected to the core wire and wound around the core wire, as described above, the effective cross-sectional area of the conductor that substantially affects the electrical characteristics and The effective conductor diameter becomes larger and the characteristic impedance becomes lower.

In addition, since the conductive material is a conductive foil or a conductive laminate,
It can be easily removed using existing terminal processing means, and the core wire can be easily connected to a printed circuit board or the like.

The insulator layer can be thick in this invention,
This does not affect the characteristic impedance of the cable. The cut-through resistance thereby increases.

According to this invention, even if the insulator layer is thick, it can be easily removed and wired using existing terminal processing tools.

Existing termination tools are available from E.P.E. Technology, Inc., Manchester, NH) or from Eubanks, Inc., Monrovia, CA.

The transmission line electric wire according to the present invention can also be applied to wiring of electronic devices. □If the core wire has an outer diameter of 0.508 mm (20 mils) or less, it can be wired to a printed circuit board that can be connected using wrapping posts. For example, 0.
635 mm (0,025 inch) square with 25 pin spacing
An example is a printed circuit board with a 4 mm (1,1'00 inch) wrapping post.

The transmission line electric wire according to the present invention can be used not only as a single wire but also as a double-stranded wire or a plurality of sets of double-stranded wires.

〔Example〕

FIG. 1 is a sectional view showing an embodiment of a single-core transmission line according to the present invention.

A conductive laminate 1 consisting of a conductive foil 2 and an insulating base material 5 is electrically connected to the core wire 3 by the conductive foil 2 and wound around the core wire 3,
A continuous electrical connection is made with the core wire 3.

The conductive foil 2 is preferably aluminum foil, and is either attached to a film base material 5 made of polyester or polyimide to form the conductive laminate 1, or the aluminum foil is attached to a base material 5 made of porous tetrafluoroethylene resin tape. The conductive laminate 1 is formed by placing the laminate in a notebook.

The conductive foil 2 may be wound twice or more times as shown in FIG. 1 in order to obtain a predetermined thickness.

The insulator layer 4 is formed on the outermost layer of the conductive laminate 1 around which the core wire 3 is wound.

FIG. 2 is a cross-sectional view showing an embodiment of the two-stranded structure of the transmission line electric wire of the present invention.

As shown in the figure, the conductive laminate 10 consisting of the conductive foil 12 and the base material 11 is arranged so that the conductive foil 12 is conductively connected to the core wire 13 and the core wire 13 is connected to the core wire 13 in a continuous electrical connection. Two cores 15 each having an insulator layer 14 formed on the outermost layer thereof are twisted to form a transmission line wire having a two-strand structure.

In FIG. 2, the outer diameter of the core wire 13 is indicated by d,
On the other hand, when the conductive foil 12 is electrically connected to the core wire 13 and formed around the outer periphery of the core wire 13, the effective outer diameter converted to the outer diameter of only the core wire that substantially affects the electrical characteristics is defined as d.

In conventional low impedance cables, dl and d match. An additional insulating film 14 is applied around the outer periphery of the conductive laminate.

Core wire 13, conductive foil 12 wound around core wire 13) Conductive foil 1
The outer diameter of the outermost layer of the cable core constituted by the insulator layer 14 formed on the outermost layer of C.2 is indicated by D.

Characteristic impedance Z. is related to the logarithm of the ratio D/d between the outer diameter of the insulator and the core diameter d of the insulated wire.

According to this invention, the core wire diameter d is theoretically replaced by the effective outer diameter d. That is, according to the present invention, the effective outer diameter of the core wire increases, so that the characteristic impedance decreases. In this embodiment, the insulating layer 14 is preferably an insulating film based on polyester or polyimide. The insulator layer 14 can be formed to have a predetermined outer diameter by extrusion or tape wrapping. Cut-through resistance is reinforced by the addition of this insulator layer 14.

〔Effect of the invention〕

According to this invention, as described above, at least six layers of conductive material are electrically connected to the core wire and formed by winding the core wire, thereby effectively disconnecting the conductor which substantially affects the electrical properties. The area and effective conductor diameter become large, and the characteristic impedance becomes low even if a core wire with a small diameter is used.

In addition, since the conductive material can be formed by adhering conductive foil and insulating base material, it can be easily removed using existing terminal processing means, and only the core wire can be connected to a printed circuit board, etc., which is a unique feature. effective.

At least six insulator layers are formed surrounding the core wire and the conductive material, so that the insulator layers do not affect the characteristic impedance of the cable. Further, since this insulating layer is located on the outermost side, by making the wall thickness sufficiently thick, mechanical strength such as cut-through resistance is improved. This insulating layer, like the conductive material, can be easily removed using existing termination tools, allowing the core wire to be connected.

Furthermore, the transmission line wire according to the present invention can be applied to wiring for electronic devices, and the core wire diameter can be reduced to 0.508 mm (2
0 mil) or less has the unique effect of being able to be used for wrapping connections.

[Manufacturing Example 1] The following is a 50 ohm electric wire with a conventional core wire.
A comparison is made between an electric wire coated with insulation without i-foil and an electric wire according to the present invention. The maximum diameter of the core wire is preferably 0.498 mm (19.6 mil), which is the optimal diameter for automatic stripping equipment.

=8= According to the prior art, the effective outer diameter, that is, the measured outer diameter 0320
The core wire is a 28 mm (126 mil) AWG solid wire, and the dielectric constant of the insulator is ε-3, 11, and the characteristic impedance is 50.
Ohm, the wire is constructed with a polyester film as the insulator and the outermost layer formed.

Here, the finished outer diameter is 0.358 mm (14°1
mils) can be achieved without increasing the characteristic impedance value. Here the ratio D/d=1.1
2 is obtained from FIG.

According to this invention, a single wire of AWG No. 28 with an effective outer diameter of 0.320 mm (126 mils) is used as a core wire, and three conductive layers are formed by attaching aluminum foil to an insulating base tape to make a conductive connection with the core wire. It is formed by winding it.

A transmission line electric wire is constructed by forming a polyester film as an insulating layer as an outermost layer surrounding the core wire and aluminum foil. The outer diameter of this wire is 0.1498 mm (196 mil).

By making aluminum foil conductively connected to the core wire and wrapping it around the outer circumference, the outer diameter of the core wire is 0320 mm (12.6 mil), which increases the effective cross-sectional area and reduces the electrically meaningful effective outer diameter. Increases to 0.445 millimeters (1,75 mils). At this time, the characteristic impedance is 50 ohms, and the dimensional ratio D/d of the obtained wire is calculated to be 1.13. The table below is
This figure summarizes the calculation results of the thickness of the outermost insulating layer and the cut-through resistance of an electric wire constructed without winding conductive foil according to the prior art and an electric wire according to the present invention.

Table 1 + Conventional technology using AWG No. 28 solid wire as the core wire and 50Ω according to the present invention Here, the thickness of the outermost layer is (1) - d) ÷ 2, and the cut-through bending radius is D ÷ 2. , respectively.

Wires with an outermost insulator layer thickness of 0.019 mm (0.75 mils) are not compatible with existing automatic terminal processors because the insulator thickness is too thin.

If the insulator is 0.019 mm (0.75 mil) thick, a normal wire end processor will cut into the outermost insulator layer with a processing blade, and will inevitably damage the center conductor when stripping it off.

Furthermore, the cut-through bend radius of 0.179 mm (7.05 mils) does not meet typical insulation stripping requirements.

In contrast, in accordance with the present invention, the center conductor has an increased effective outside diameter and an increased finished outside diameter and cut-through bend radius for use with conventional automatic termination equipment.

[Manufacturing example 2] AWG #28, measured outer diameter 0.320 mm (126 mil)
The same comparison as in [Manufacturing Example I] was made for an electric wire having a characteristic impedance of 55 ohms and made of a dielectric material having a dielectric constant of ε-3.1, using a single wire as a core wire.

In this case, the dimension ratio D/d is 1.15 according to FIG. A large amount of test data and calculation results supported the effectiveness of the present invention as in [Production Example 1]. The test results are shown in Table 2 below.

Table 2: Conventional technology using AWG No. 28 solid wire as the core wire and 55Ω according to the present invention. Here, the thickness of the outermost layer is (D-d) ÷ 2, the cut-through bending radius is D ÷ 2, Each is calculated.

In this example as well, while the characteristic impedance required by this invention remains at 55 ohms, the outer insulating layer and the radius of termination processing are each increased by 39%, making it possible to work using the existing termination equipment as is. I can do it.

[Manufacturing Example 3] A comparison between a conventional cable constructed without wrapping the core wire in foil and a 75 ohm double stranded wire according to the present invention is shown below.

Dimensional ratio D/ of a core wire made of conventional technology AW030, a single wire with a measured outer diameter of 0.257 mm (jo, 1 mil), and a dielectric constant of ε = 3.12) and a characteristic impedance of 75 ohm. It can be found complementary from FIG. 3 that d is 1.36.

Similarly, a pair of AWG No. 30 single wires are wound around the outer periphery with aluminum foil adhesive insulating tape that is conductively connected to each wire, thereby forming a two-stranded wire.

In this case, the finished outside diameter is 0.495. : (19°5 mils), the effective outer diameter d is 0.366 mm (14.4 mils), and the ratio D/d is 1.31. The table below summarizes the comparison of the physical properties of a conventional double-stranded wire using a pair of AWG No. 30 solid wires as core wires and a double-stranded wire according to the present invention.

Table 3: Using AW030 solid wire, the thickness of the outermost layer is (D-d)+2, and the cut-through bending radius is calculated as D÷2.

In this manufacturing example, an optimal combination was obtained in which a single wire of AWG No. 30 was used as the core wire, the outer diameter of the insulator was 0.495 mm (19.5 mil), and the characteristic impedance was 75 ohms as required.

In this case, the AWo No. 30 solid wire is insulated with a polyester film and the outer diameter is 0.495 mm (19 mm).
, 5 mil), the characteristic impedance is 10
It becomes 0 ohm.

75 using this AWG 30 single wire according to the present invention.
The ohmic bistrand wire increases the thickness of the outermost insulator to improve cut-through resistance without increasing the characteristic impedance.

Furthermore, the cut-through bending radius increases by 431 (-cents), and the end can be processed as is with the existing end processor.

It should be noted that this invention is not limited to the embodiments and manufacturing examples described above, and various changes can be made within the technical idea of this invention.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing different embodiments of single-core and double-stranded transmission line cables according to the present invention, and FIG. 3 shows the center conductor diameter d and cable specifications of the cable according to the prior art. It is a correlation graph between the ratio D/d to the outer diameter of the bar and the characteristic impedance. 1.10: Conductive material, 2.12 ・Conductive foil, 3.13
Core wire.

Claims (3)

[Claims] (1) A core wire, at least one layer of conductive material wound around the outer periphery of the core wire, and at least one further layer provided around the outer periphery of the core wire and conductive material so that the total outer diameter is 0.508 mm or less. A transmission line wire with a characteristic low impedance consisting of an insulating layer. (2) The transmission line wire according to claim 1, wherein the conductive material is a conductive foil. (3) The transmission line wire according to claim 1 or 2, wherein the conductive material is a conductive laminate of aluminum foil and an insulating base material.