TWM513443U - Two-core parallel electric wire - Google Patents

Description

2-core parallel wire

The present invention relates to a 2-core parallel electric wire, and more particularly to a 2-core electric wire covered by a metal foil resin tape and which is wound in parallel around the two electric wires. Parallel wires.

As a signal line for communication in a high frequency band of the gigahertz (GHz) band, a 2-core parallel electric wire is known, that is, a plurality of wires, for example, two wires, are transmitted as a differential signal transmission method. The signal is shielded by a cable.

Patent Document 1 discloses a shielded cable including a shield conductor in which a metal foil resin tape is wound around a plurality of signal lines. Further, a configuration is disclosed in which the shielded cable is provided with a metal foil resin tape longitudinally around the signal line in order to suppress a band out phenomenon (a large drop in the frequency characteristic of the signal attenuation amount) in the high frequency band. Here, in the structure in which the metal foil resin tape is wound laterally, the conductor layer and the insulator layer are periodically repeated in the longitudinal direction, and the high-frequency signal causes resonance to generate a band gap phenomenon, whereas the band gap phenomenon occurs. By providing the metal foil resin tape in the longitudinal direction, the above-described band gap phenomenon can be suppressed.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2012-238468

When only the shield conductor formed of the metal foil resin tape is longitudinally disposed as in Patent Document 1, a frequency band having a sharp decrease in the frequency characteristic of the signal attenuation amount or a dip is generated in a frequency band around 20 GHz.

The present invention has been made in view of the above-described actual conditions, and aims to provide a 2-core parallel electric wire capable of suppressing the rapid attenuation of the frequency characteristic of the signal attenuation amount in the signal transmission in the high frequency band and performing high-speed and stable operation signal transmission.

The two-core parallel wire of the present invention has two insulated wires arranged side by side in parallel; a metal foil resin tape which longitudinally covers the two insulated wires together; and a first resin tape which is spirally wound around the metal foil resin tape And a second resin tape spirally wound around the first resin tape in a direction different from a winding direction of the spiral winding of the first resin tape, wherein a winding pitch of the first resin tape is 5mm or less.

According to the present invention, it is possible to provide a 2-core parallel electric wire which can suppress the rapid attenuation of the frequency characteristic of the signal attenuation amount in the signal transmission in the high frequency band and can perform high-speed and stable operation signal transmission.

1‧‧‧ Signal conductor

2‧‧‧Insulator

3‧‧‧Insulated wires

4‧‧‧汲polar line

5‧‧‧Metal foil resin tape

6‧‧‧1st resin tape

7‧‧‧2nd resin tape

10‧‧‧Shielded cable

Fig. 1 is a view for explaining a configuration example of a 2-core parallel electric wire of the present invention.

Fig. 2 is another view for explaining a configuration example of a 2-core parallel electric wire of the present invention.

Figure 3 shows the corresponding signal attenuation between the first resin strip in the 2-core parallel wire. A diagram of the frequency characteristics.

Fig. 4 is another view showing the frequency characteristic of the corresponding signal attenuation amount from the first resin strip in the 2-core parallel electric wire.

Fig. 5 is still another view showing the frequency characteristic of the corresponding signal attenuation amount from the first resin tape in the 2-core parallel electric wire.

First, an embodiment of the present creation will be described.

(1) The creation of the present application is a 2-core parallel electric wire having two insulated electric wires side by side in parallel; a metal foil resin tape which longitudinally covers the two insulated electric wires together; a first resin tape having a spiral shape Wrapped around the outer side of the metal foil resin tape; and a second resin tape spirally wound around the first resin tape in a direction different from a winding direction of the spiral winding of the first resin tape, 1 The winding distance of the resin tape is 5 mm or less. Thereby, it is possible to provide a 2-core parallel electric wire which can suppress the rapid attenuation of the frequency characteristic of the signal attenuation amount in the signal transmission in the high frequency band and can perform high-speed and stable operation signal transmission.

(2) The winding pitch of the first resin tape is preferably 4 mm or less. Thereby, stable signal transmission under a wider frequency band can be performed.

[Details of the new embodiment of the present application]

Hereinafter, a specific example of the two-core parallel electric wire of the present creation will be described with reference to the drawings. In addition, the present invention is not limited to the examples, and all modifications within the meaning and scope of the claims are included in the scope of the claims.

1 and 2 are views for explaining a configuration example of a 2-core parallel electric wire of the present invention, and FIG. 1 is a front view of a shielded cable formed of a 2-core parallel electric wire. FIG. 2 is a view for explaining a laminated structure when the shielded cable is viewed from the side in the longitudinal direction of the shielded cable. FIG.

In Fig. 1 and Fig. 2, 1 is a signal conductor, 2 is an insulator, 3 is an insulated wire, 4 is a drain wire, 5 is a metal foil resin tape, 6 is a first resin tape, 7 is a second resin tape, and 10 is a Shielded cable.

The shielded cable 10 which is a two-core parallel electric wire has a structure in which two insulated conductors (signal lines) including a single conductor or a stranded signal conductor 1 are covered by an insulator 2 having a predetermined dielectric constant. ) 3 arranged in parallel. The signal conductor 1 of the insulated wire 3 is formed of a good conductor such as copper or aluminum, or a single core wire or a stranded wire obtained by tin-plating the excellent conductor, for example, a wire equivalent to AWG 24 to 32 (outer diameter 0.51) ~0.21mm).

As the insulator 2 for electrically insulating the signal conductor 1, the dielectric constant is as small as possible, and for example, polyethylene (PE), ethylene-vinyl acetate copolymer (EVA, Ethylene Vinyl Acetate), fluororesin, etc. can be used. . The resin may also be foamed so that fine bubbles are located in the resin. In the case of including the foamed layer in the insulator 2, the foaming rate of the foamed layer can be set to 50 to 70%. The outer diameter of the insulated wire 3 formed of the wire and the insulating resin is 3.0 mm to 0.4 mm. For example, when the wire of the AWG 26 is used, the outer diameter of the insulated wire 3 is set to about 1.2 mm. Further, a coaxial electric wire may be used instead of the insulated electric wire 3, which is obtained by braiding or laterally winding a wire as an outer conductor on the outer side of the insulator 2 or winding a metal foil resin tape around the outer side of the insulator 2. to make.

Then, the drain line 4 is made longitudinal with respect to the two signal conductors 1 arranged in parallel. The thickness of the drain wire 4 is preferably the same as or slightly thinner than the diameter of the conductor of the insulated wire 3. Alternatively, it may be configured not to use the drain line 4.

In the outer circumference of the two insulated wires 3 and the drain wire 4, longitudinally (cigarette type, metal foil resin) The metal foil resin tape 5 as a shield conductor is provided in a winding manner in which the length direction of the electric wire is aligned. Thereby, the two insulated wires 3 are shielded together. The surface of the bungee wire is electrically conductive. The metal foil resin tape is disposed such that its metal foil is in contact with the drain wire in a conductive manner.

The metal foil resin tape 5 is formed by laminating a metal foil such as aluminum or copper on a plastic substrate (resin tape) such as polyethylene terephthalate (PET). The thickness of the metal foil is, for example, 3 μm to 30 μm, the thickness of the plastic substrate is, for example, 3 μm to 50 μm, and the thickness of the metal foil resin tape 5 is, for example, 6 μm to 80 μm.

On the outer side of the metal foil resin tape 5, resin tapes 6, 7 made of, for example, polyethylene terephthalate (PET) as a base resin are provided. The first resin tape 6 on the inner side and the second resin tape 7 on the outer side are spirally wound, and the winding direction of the spiral winding is different from each other in the first resin tape 6 and the second resin tape 7.

Further, the outer side of the second resin tape 7 may be coated with a film (not shown) to have water resistance as a cable for preventing contamination.

In the embodiment of the present invention, the first resin tape 6 and the second resin tape 7 are sequentially coated on the metal foil resin tape 5 in the longitudinal direction and the outer side thereof in such a manner that the winding directions of the spiral winding are different from each other. By optimizing the respective winding pitches, it is possible to suppress the rapid attenuation of the frequency characteristics of the signal attenuation amount in the signal transmission in the high frequency band, thereby enabling high-speed, stable operation of signal transmission.

As shown in FIG. 2, the first and second resin tapes 6 and 7 are provided so that the winding directions of the spiral winding are different from each other. When the first resin tape is wound to the right, the second resin tape is wound to the left. When the first resin tape is wound to the left, the second resin tape is wound to the right. The overlap width of the resin tape is preferably from one fifth to one half of the bandwidth.

Here, the distance P2 between the spiral windings of the first resin tape 6 and the spiral winding between the P1 and the second resin tape 7 is optimized.

Specifically, the spiral winding pitch P1 of the first resin tape 6 is set to be equal to or less than the spiral winding pitch P2 of the second resin tape 7 . Alternatively, the spiral winding pitch P1 of the first resin tape 6 is set to be 2.1 times or less the width of the two insulated wires 3 arranged. Alternatively, the spiral winding pitch P1 of the first resin tape 6 is set to 5 mm or less. More preferably, it is set to combine the configurations.

3 to 5 are views showing the frequency characteristics of the corresponding signal attenuation amount from the first resin tape in the 2-core parallel electric wire. In each of the figures, the vertical axis is the signal attenuation amount (dB/m), and the horizontal axis is the frequency (GHz) to indicate the frequency characteristic of the signal attenuation amount. The amount of signal attenuation is represented by the insertion loss Sdd21 of the actuation signal in the two parallel wires.

Here, the insulated wire 3 (outer diameter 1.2 mm) of the AWG 26 is used, and the bandwidth of the first resin tape 6 and the second resin tape 7 is set to 5 mm, and the winding pitch P2 of the second resin tape 7 is also set to 5 mm. The winding pitch P1 of the first resin tape 6 was changed, and the amount of signal attenuation at this time was confirmed. The overlap width of the resin tape is set to be one quarter of the bandwidth in each of the resin tapes.

Fig. 3 is a view showing the frequency characteristics of the signal attenuation amount when the winding pitch P1 of the first resin tape 6 is 6 mm. Thereby, a drop in the amount of signal attenuation, that is, an instantaneous drop, occurs in a frequency band lower than the frequency of 20 GHz, so that stable transmission characteristics in the frequency region cannot be obtained.

4 is a view showing the frequency characteristics of the signal attenuation amount when the winding pitch P1 of the first resin tape 6 is 5 mm. Accordingly, a decrease in the amount of signal attenuation, that is, an instantaneous drop, occurs in a frequency band exceeding the frequency of 20 GHz, but no instantaneous drop occurs until the frequency is 20 GHz. Thereby, stable transmission characteristics can be obtained in a high frequency region up to the order of 20 GHz.

Fig. 5 is a view showing the frequency characteristics of the signal attenuation amount when the winding pitch P1 of the first resin tape 6 is 4 mm. Accordingly, there is no sharp drop in the amount of signal attenuation in all frequency bands up to the frequency of 25 GHz, so that stable transmission characteristics can be obtained.

According to the above configuration, the metal foil resin tape 5 is disposed longitudinally around the two signal conductors 1 arranged in parallel, and the first resin tape 6 and the second resin are provided around the metal foil resin tape 5 The belts 7 are spirally wound in different winding directions, and the winding pitch of the first resin belt 6 is preferably 5 mm or less, more preferably 4 mm or less. In other words, the winding pitch of the first resin tape 6 is preferably equal to or less than the bandwidth of the resin tape 6, and more preferably 80% or less of the tape width of the resin tape 6.

The width of the first resin tape is preferably 2.1 times or less the width of the two insulated electric wires constituting the two-core parallel electric wires.

The winding pitch of the first resin tape is preferably equal to or less than the winding pitch of the second resin tape.

Further, the winding pitch P2 of the second resin tape 7 is preferably equal to the bandwidth of the resin tape. The bandwidth of the first and second resin strips 6, 7 is further preferably about four times the diameter of the insulated electric wire 3.

According to the above configuration, by optimizing the winding pitch of the first resin tape 6 and the second resin tape 7, it is possible to suppress the rapid attenuation of the frequency characteristic of the signal attenuation amount in the signal transmission in the high frequency band. Perform high-speed, stable motion signal transmission.

1‧‧‧ Signal conductor

2‧‧‧Insulator

3‧‧‧Insulated wires

4‧‧‧汲polar line

5‧‧‧Metal foil resin tape

6‧‧‧1st resin tape

7‧‧‧2nd resin tape

10‧‧‧Shielded cable

Claims (8)

A 2-core parallel electric wire having: two insulated electric wires arranged side by side in parallel; a metal foil resin tape covering the two insulated electric wires longitudinally together; and a first resin tape spirally wound around the metal foil resin tape And a second resin tape spirally wound around the first resin tape in a direction different from a winding direction of the spiral winding of the first resin tape, wherein the first resin tape is The winding pitch is 5 mm or less. The two-core parallel electric wire according to the first aspect of the invention, wherein the first resin tape has a winding pitch of 4 mm or less. A 2-core parallel electric wire having: two insulated electric wires arranged side by side in parallel; a metal foil resin tape covering the two insulated electric wires longitudinally together; and a first resin tape spirally wound around the metal foil resin tape And a second resin tape spirally wound around the first resin tape in a direction different from a winding direction of the spiral winding of the first resin tape, wherein the first resin tape is The winding pitch is equal to or less than the winding pitch of the second resin tape. The two-core parallel electric wire according to claim 3, wherein the first resin tape has a winding pitch of 5 mm or less. The two-core parallel electric wire according to claim 3, wherein a winding pitch of the first resin tape is 2.1 times or less of a width of two of the insulated electric wires. The two-core parallel electric wire according to claim 5, wherein the first resin tape has a winding pitch of 5 mm or less. A 2-core parallel electric wire having: two insulated electric wires arranged side by side in parallel; a metal foil resin tape which longitudinally covers the two insulated electric wires together; and a first resin tape which is spirally wound around The second resin tape is spirally wound around the first resin tape in a direction different from the winding direction of the spiral winding of the first resin tape, and the second resin tape is characterized in that The winding pitch of the first resin tape is 2.1 times or less the width of the two insulated electric wires. The two-core parallel electric wire according to Item 7, wherein the first resin tape has a winding pitch of 5 mm or less.