WO2017010432A1

WO2017010432A1 - Transmission cable and acoustic cable using said transmission cable

Info

Publication number: WO2017010432A1
Application number: PCT/JP2016/070308
Authority: WO
Inventors: 田中　浩二
Original assignee: ８９４トレーディング株式会社
Priority date: 2015-07-10
Filing date: 2016-07-08
Publication date: 2017-01-19
Also published as: JP6110440B2; JP2017021973A

Abstract

The present invention addresses the problem of providing a transmission cable that mitigates phase lags or voltage decreases of signals when transmitting audio signals, video signals, data signals or the like over a broad band, and an acoustic cable using the same. Provided is a transmission cable that is configured such that two conductive wires having different diameters are wound together, four conductive wires in two wound sets are arranged so as to be approximately parallel, a first signal wire is formed by the two conductive wires having the smaller diameter and a second signal wire is formed by the two conductive wires having the larger diameter, and the first signal wire is connected to a hot signal terminal and the second signal wire is connected to a cold signal terminal.

Description

Transmission cable and acoustic cable using the transmission cable

The present invention relates to a transmission cable and a sound cable using the transmission cable with a small phase shift delay and voltage drop during transmission of an audio signal, a video signal, a data signal, etc. in a wide band.

When a signal such as an audio signal, a video signal, or a data signal is transmitted through a transmission cable, transmission characteristics such as signal phase delay and voltage drop may be deteriorated due to the inductance of the transmission cable. It has been pointed out.

In order to solve the problem of deterioration of transmission characteristics, various studies have been made such as installing a repeater or a compensation circuit in the middle of transmission. However, since these repeaters and compensation circuits require special parts, and these special parts need to be installed at certain distances, the cost of the transmission cable increases. Therefore, there is a demand for a method for reducing the deterioration of transmission characteristics by devising the shape of the wiring without using such a repeater or a compensation circuit.

Furthermore, it is known that the deterioration of the transmission characteristics is remarkable in the high frequency region (for example, 100 kHz or more) due to the inductance, dielectric loss, etc. of the transmission cable. Such deterioration of transmission characteristics in a high frequency region particularly affects transmission of acoustic signals in acoustic cables such as speaker cables, microphone cables, guitar cables, synthesizer cables, and earphone cables.

Since the frequency range that affects the transmission of the acoustic signal does not overlap with the human audible range (about 20 kHz), it has not been considered as a problem in the past.
However, even if the signal has a frequency that is not recognized as “sound” by human hearing, it will be transmitted as vibration if it exists. Therefore, the phase shift delay and voltage drop of the signal in the high frequency range may cause deterioration in transmission characteristics, that is, sound quality. Deterioration. In recent years, this has attracted attention especially to music professionals and musicians, and the development of a transmission cable with improved sound quality degradation in the high frequency region has been desired.

Patent Gazette JP 2004-297538 A

An object of the present invention is to provide a transmission cable and a sound cable using the transmission cable with a small delay in phase shift and voltage drop during transmission of an audio signal, a video signal, a data signal, etc. in a wide band.

As a result of intensive studies in view of the above circumstances, the present inventors have found a transmission cable that can reduce a phase shift delay and a voltage drop (amplitude reduction) of a transmission signal even in a high frequency region.

That is, the transmission cable of the present invention includes a first conductive wire, a second conductive wire, a third conductive wire, and a fourth conductive wire, each of which is insulation-coated, and the first conductive wire and the second conductive wire. The diameter is smaller than the diameters of the third conductor and the fourth conductor, the first conductor is wound around the third conductor, the second conductor is wound around the fourth conductor, The third conducting wire is disposed substantially parallel to the fourth conducting wire, and the first conducting wire and the second conducting wire are electrically connected at one end side and the other end sides are also electrically connected. The third conductor and the fourth conductor are connected so that one end sides are electrically connected to each other and the other end sides are also electrically connected to each other.

In addition, the transmission cable of the present invention further includes a flat knitted conductive wire covering the first to fourth conductive wires, and is configured so that at least one end side of the flat knitted conductive wire is grounded.

In the transmission cable of the present invention, the first signal line is formed by the first conductor and the second conductor, and the first signal line is connected to the hot signal terminal, and the third conductor and the fourth conductor are connected. A second signal line is formed by the conducting wire, and the second signal line is configured to be connected to the cold signal terminal.

The transmission cable of the present invention has transmission characteristics with less phase lag and voltage drop of a transmission signal in a wide band including a frequency region higher than 100 kHz as compared with a conventional product.
Further, the transmission cable of the present invention does not require a repeater or a compensation circuit during transmission, and realizes the above transmission characteristics by devising the shape of the wiring. In particular, the present invention can be applied to an acoustic cable with good sound quality that requires reduction of deterioration in a wide band.

The block diagram of the transmission cable (speaker cable) of Example 1 is shown. The cross-sectional perspective view of the transmission cable of Example 1 is shown. The block diagram of the transmission cable (microphone cable) of Example 2 is shown. The cross-sectional perspective view of the transmission cable of Example 2 is shown. The block diagram of the transmission cable (guitar cable) of Example 3 is shown. The cross-sectional perspective view of the transmission cable of Example 3 is shown. The circuit block diagram for evaluation of the transmission cable of an Example and a comparative example is shown. The wave form diagram which compared the voltage drop and phase shift delay of the transmission cable of Example 1 (a) and Comparative Example 1 (b) is shown. The frequency characteristics of the transmission cable of Example 1 and Comparative Example 1 are compared. The wave form diagram which compared the voltage drop and phase shift delay of the transmission cable of Example 4 (a) and Comparative Example 2 (b) is shown.

The transmission cable of the present invention includes four conductive wires each insulated.

The four conductive wires are selected from conductive wires for surface insulation that are made of conductive metal. Examples of the conductive metal include rare metals such as copper, silver, platinum, palladium, and rhodium. Among these, a polyurethane enameled copper wire is more preferable from the viewpoint of versatility, high temperature characteristics, and ease of soldering.

The four conducting wires are single wires, and the diameters of the first conducting wire and the second conducting wire are smaller than the diameters of the third conducting wire and the fourth conducting wire. The diameter and the ratio of the diameters are selected according to the purpose of the transmission cable, that is, the characteristics of the transmission signal according to the purpose, such as for speaker cables, microphone cables, guitar cables, synthesizer cables, earphone cables, and the like. Among them, the speaker cable is selected from those having a larger diameter. For example, the diameter range of the first conductor and the second conductor is 0.4 to 0.6 mm, and the range of the diameter of the third conductor and the fourth conductor. Is preferably 0.6 to 0.8 mm. For example, a microphone cable, a guitar cable, a synthesizer cable, etc. have a diameter range of 0.2 to 0.5 mm for the first conductor and the second conductor, and a diameter range of 0.3 mm for the third conductor and the fourth conductor. While 6-0.8 mm is preferred, the earphone cable is selected from those having a smaller diameter. For example, the diameter range of the conductor is preferably 0.1-0.2 mm. In consideration of the ease of winding, the diameters of the first conductor and the second conductor are 0.1 to 0.6 mm, and the diameters of the third and fourth conductors are 0.2 to 0. More preferably, it is 8 mm.

The first conductive wire is wound around the third conductive wire, and the second conductive wire is wound around the fourth conductive wire. The winding direction of the first conducting wire and the third conducting wire may be the same direction as the winding direction of the second conducting wire and the fourth conducting wire, or may be the opposite direction.

Since the diameters of the first conductor and the second conductor are smaller than the diameters of the third conductor and the fourth conductor, the lengths of the first and second conductors used for winding are It becomes longer than the length of the 3rd and 4th conducting wire. Also from the viewpoint of improving sound quality in the high frequency region, the lengths of the first and second conductors are configured to be 1.1 to 2.0 times the lengths of the third and fourth conductors. It is more preferable that it is configured in the range of 1.15 to 1.5 times.

The length of the transmission cable of the present invention is not particularly limited, but is appropriately selected from the viewpoint of transmission characteristics according to the purpose of use. In the example of the acoustic cable, it is configured to be 50 m or less, more preferably 30 m or less from the viewpoint of maintaining the space and sound quality of a live house or concert hall.

An example of the transmission cable of the present invention further includes a flat braided conductor covering the first to fourth conductors. The flat braided wire is grounded at least at one end in the longitudinal direction.

In an example of the transmission cable of the present invention, a first signal line is formed by a first conductor and a second conductor, and the first signal line is connected to a hot signal terminal, and the third conductor and the fourth conductor are connected. A second signal line is formed by the conducting wire, and the second signal line is connected to the cold signal terminal. That is, the first conductor and the second conductor transmit a hot signal, and the third conductor and the fourth conductor transmit a cold signal.

An example of the transmission cable of the present invention further includes a flat braided conductor covering the first to fourth conductors, and a first signal line is formed by the first to fourth conductors, and the first signal line Is connected to a hot signal terminal, and the flat signal wire forms a second signal line, which is connected to the cold signal terminal.

An example of the transmission cable of the present invention further includes a jacket tube. The jacket tube is selected from wiring tubes having insulating properties for directly covering the four conducting wires. For example, organic polymer materials such as nylon, polyurethane, polyethylene terephthalate, polyvinyl chloride, and polyester, natural materials, and the like are selected according to the purpose of use. Of these, nylon and polyurethane are more preferred because they are highly versatile and have little effect on transmission signals.

The jacket tube is configured to directly cover the four conductors by inserting the two sets of the wound conductors into the jacket tube.
When the transmission cable of the present invention further includes a flat knitted conductor, the jacket tube directly covers the four conductors by inserting the two sets of wound conductors into the jacket tube, and the The braided wire is configured to cover the jacket tube through which the two sets of wound wires are inserted.

An example of the transmission cable of the present invention further includes a mesh tube. The mesh tube is an outer tube for covering the outer peripheral surface of the transmission cable, and is appropriately selected from materials, thicknesses, and thicknesses that are not affected by noise from the outside of the transmission cable.

The frequency characteristics and phase shift delays of the transmission cable examples and comparative examples of the present invention are obtained by outputting a sine wave with an arbitrary waveform generator and applying it to the inlet end of the transmission cable, and the non-inductive resistance at the outlet end of the transmission cable. A measurement device is attached and an oscilloscope is connected to the transmission cable inlet and outlet ends.
The voltage drop of the transmission cable is confirmed by measuring a decrease in the voltage level at the entrance end and the exit end, that is, a decrease in the peak height of the sine wave of the oscilloscope (unit: mV or the like).
The phase shift delay of the transmission cable is confirmed by measuring the waveform delay (unit: nsec, etc.) at the inlet end and the outlet end.

Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

Table 1 shows an outline of Examples 1 to 4 and Comparative Examples 1 and 2.

Example 1
The transmission cable 11 of Example 1 is manufactured as follows.
Using the material described in Example 1 of Table 1, the first conductive wire 1, which is a single-layer polyurethane enameled copper wire, is wound around the third conductive wire 3 in a certain direction, and the second conductive wire 2 is wound around the fourth conductive wire 4. Winding in the same direction as the above direction, the two sets of wound conducting wires are inserted through the nylon outer tube 5 so as to be arranged substantially in parallel, and the outer tube 5 is covered with the mesh tube 6. The first conducting wire 1 and the second conducting wire 2 are connected to the hot signal terminal 7 at both ends, and the third conducting wire 3 and the fourth conducting wire 4 are connected to the cold signal terminal 8 at both ends. The cable length is 2 m.
FIG. 1 shows a configuration diagram of the transmission cable 11 of the first embodiment, and FIG. 2 shows a cross-sectional perspective view of the transmission cable 11 of the first embodiment.

(Example 2)
The transmission cable 11 of Example 2 is manufactured as follows.
Using the material described in Example 2 of Table 1, the first conductive wire 1 that is a single-layer polyurethane enameled copper wire is wound around the third conductive wire 3 in a certain direction, and the second conductive wire 2 is wound around the fourth conductive wire 4. Wrapped in the same direction as the above direction, the two sets of wound conductors wound are inserted into the outer jacket tube 5 made of nylon so as to be arranged substantially in parallel, and the outer jacket tube 5 is covered with a flat woven conductor wire 9 made of copper, The flat knitted lead wire 9 is further covered with a mesh tube 6. The first conductor 1 and the second conductor 2 are connected to the hot signal terminal 7 at both ends, the third conductor 3 and the fourth conductor 4 are connected to the cold signal terminal 8 at both ends, and the flat knitted conductor 9 is grounded by the ground terminal 10 on one side of the inlet end side. The cable length is 2 m.
FIG. 3 shows a configuration diagram of the transmission cable 11 of the second embodiment, and FIG. 4 shows a cross-sectional perspective view of the transmission cable 11 of the second embodiment.

(Example 3)
The transmission cable 11 of Example 3 is manufactured as follows.
Using the material described in Example 3 of Table 1, the first conductive wire 1, which is a single-layer polyurethane enameled copper wire, is wound around the third conductive wire 3 in a certain direction, and the second conductive wire 2 is wound around the fourth conductive wire 4. Wrapped in the same direction as the above direction, the two sets of wound conductors wound are inserted into the outer jacket tube 5 made of nylon so as to be arranged substantially in parallel, and the outer jacket tube 5 is covered with a flat woven conductor wire 9 made of copper, The flat knitted lead wire 9 is further covered with a mesh tube 6. The first to fourth conductors 1 to 4 are connected to the hot signal terminal 7 at both ends, and the flat braided conductor 9 is connected to the cold signal terminal 8 at both ends. The cable length is 2 m.
FIG. 5 shows a configuration diagram of the transmission cable 11 of the third embodiment, and FIG. 6 shows a cross-sectional perspective view of the transmission cable 11 of the third embodiment.

Example 4
The transmission cable 11 of Example 4 is manufactured as follows.
Using the material described in Example 4 in Table 1, the first conductive wire 1 that is a single-layer polyurethane enameled copper wire is wound around the third conductive wire 3 in a certain direction, and the second conductive wire 2 is wound around the fourth conductive wire 4. Winding in the same direction as the above direction, the two sets of wound conducting wires are inserted through the nylon outer tube 5 so as to be arranged substantially in parallel, and the outer tube 5 is covered with the mesh tube 6. The first conducting wire 1 and the second conducting wire 2 are connected to the hot signal terminal 7 at both ends, and the third conducting wire 3 and the fourth conducting wire 4 are connected to the cold signal terminal 8 at both ends. The cable length is 10 m.
The transmission cable 11 of the fourth embodiment has the same configuration as that of the first embodiment except that the cable length is different (see FIGS. 1 and 2).

(Comparative Example 1)
As the transmission cable of Comparative Example 1, a commercially available speaker cable (cable length 2 m) was used. The outline is as described in Comparative Example 1 in Table 1.
It is not a structure in which conducting wires having different diameters are wound around each other, but a structure using copper stranded wires in which nine 0.153 mm copper wires are bundled.

(Comparative Example 2)
As the transmission cable of Comparative Example 2, a commercially available speaker cable (cable length: 10 m) was used. The outline is as described in Comparative Example 2 in Table 1.
It is not a structure in which conducting wires having different diameters are wound, but a structure using a copper stranded wire in which nine 0.153 mm copper wires are bundled.

(Measurement of frequency characteristics and phase shift delay of transmission cable)
FIG. 7 shows the frequency characteristics of the transmission cable and the arrangement of measuring devices for phase shift delay in the examples and comparative examples.
The arbitrary waveform generator 12, the oscilloscope 13 and the voltmeter 14 in FIG. 7 include a Kenwood low frequency transmitter (model number: AG-204D), an Agilent oscilloscope (model number: 54622D), and a Texio Technology company. An electronic voltmeter (model number: VT-181E) was used. The non-inductive resistance was 8.2Ω.
A sine wave having a frequency of 10 kHz to 1 MHz was generated, and the waveforms at the inlet end and the outlet end were measured with an oscilloscope 13.

In FIG. 8, the example of the waveform of the oscilloscope 13 of the entrance end of the transmission cable of Example 1 (a) and the comparative example 1 (b) and an exit end is shown.
When a sine wave having a frequency of 1000 kHz and a voltage level of 200 mV was generated and transmitted through a 2 m transmission cable, the voltage level of the sine wave was 125 mV and the phase delay was 120 nsec in Comparative Example 1, whereas in Example 1, the sine wave was The wave voltage level was 150 mV and the phase lag was 80 nsec. From this, it was found that Example 1 had less voltage drop and phase delay of the sine wave than Comparative Example 1.
Table 2 shows measurement results of the voltage drop and the phase delay when the frequency is changed in Example 1 and Comparative Example 1. FIG. 9 shows the measurement results of the voltage drop between Example 1 and Comparative Example 1 when the frequency is changed.

In FIG. 10, the example of the waveform of the oscilloscope of the entrance end of the transmission cable of Example 4 (a) and Comparative Example 2 (b) and an exit end is shown.
When a sine wave having a frequency of 1000 kHz and a voltage level of 200 mV was generated and transmitted through a 10 m transmission cable, the voltage level of the sine wave was 45 mV and the phase delay was 200 nsec in Comparative Example 2, whereas in Example 4, the sine wave was The wave voltage level was 125 mV and the phase lag was 120 nsec. From this, it was found that Example 4 had less sine wave voltage drop and phase delay than Comparative Example 2.

In the above embodiment, the jacket tube 5 and the mesh tube 6 are provided for the purpose of improving the durability, but the jacket tube 5 and the mesh tube 6 may be omitted.

The transmission cable of the present invention enables transmission with little phase delay and voltage drop of a transmission signal in a wide band including a frequency region higher than 100 kHz.
In particular, the present invention can be applied to an acoustic cable with good sound quality that requires reduction of deterioration in a wide band.

1: 1st conducting wire 2: 2nd conducting wire 3: 3rd conducting wire 4: 4th conducting wire 5: Jacket tube 6: Mesh tube 7: Hot signal terminal 8: Cold signal terminal 9: Flat braided conducting wire 10: Ground terminal 11: Transmission cable 12: Arbitrary waveform generator 13: Oscilloscope 14: Voltmeter 15: Non-inductive resistance

Claims

A first conductor wire, a second conductor wire, a third conductor wire and a fourth conductor wire, each of which is insulated;
Including
The diameters of the first conductor and the second conductor are smaller than the diameters of the third conductor and the fourth conductor;
The first conductor is wound around the third conductor;
The second conductor is wound around the fourth conductor;
The third conductor is disposed substantially parallel to the fourth conductor;
The first conductive wire and the second conductive wire are electrically connected at one end side and are also electrically connected at the other end side,
A transmission cable in which one end sides of the third conductor and the fourth conductor are electrically connected to each other and the other ends are also electrically connected to each other.
The transmission cable according to claim 1, wherein the winding direction of the first conductor is the same as the winding direction of the second conductor.
A flat braided wire covering the first to fourth conducting wires;
The transmission cable according to claim 1 or 2, wherein at least one end side of the flat braided wire is grounded.
A first signal line is formed by the first conductive line and the second conductive line, and the first signal line is connected to the hot signal terminal,
The transmission cable according to any one of claims 1 to 3, wherein a second signal line is formed by the third conductor and the fourth conductor, and the second signal line is connected to a cold signal terminal.
A flat braided wire covering the first to fourth conducting wires;
A first signal line is formed by the first to fourth conducting wires, and the first signal line is connected to a hot signal terminal;
The transmission cable according to claim 1 or 2, wherein a second signal line is formed by the flat braided wire, and the second signal line is connected to a cold signal terminal.
Further comprising an insulating jacket tube,
The transmission cable according to any one of claims 1 to 5, wherein the jacket tube directly covers the first to fourth conducting wires.
The transmission cable according to any one of claims 1 to 6, wherein the outer peripheral surface is covered with a mesh tube.
The diameter of the first conductor and the second conductor is 0.1 to 0.6 mm, and the diameter of the third conductor and the fourth conductor is 0.2 to 0.8 mm. 8. The transmission cable according to any one of 1 to 7.
An acoustic cable using the transmission cable according to any one of claims 1 to 8.