JP2004273240A - Line cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a line cable capable of reducing disconnection trouble compared with a solid wire, obtaining high quality regeneration sound, transmitting sufficiently high band signals, and selecting various tone colors. <P>SOLUTION: The line cable is composed of a core member 1 formed by intertwisting two core wires 1a, 1b at the specified pitches, and a signal wire 2 formed by intertwisting two signal wires 2a, 2b having a thinner diameter than the core wires at the shorter pitch than the intertwisting pitch of the core wires. The signal wires 2a, 2b are wound along the dent-like groove 3 formed by intertwisting the core wires 1a, 1b. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement in a line cable suitable for use mainly in signal transmission between audio devices or the like.
[0002]
[Prior art]
BACKGROUND ART Conventionally, stranded wires have been widely used as electric wires (conductors) of line cables for signal transmission between audio devices due to their good handling.
However, it has been proposed to use a single wire instead of the above-mentioned stranded wire, and according to this, a sound quality different from that of the stranded wire was obtained, and it was also known that the sound was good, but the following disadvantages were found. Yes, only a few have been commercialized.
That is, one of the drawbacks is that the softness is less than that of the stranded wire, the handling is slightly troublesome, and there is a fear of a disconnection accident.
[0003]
Also, as a problem in sound quality, if a single-wire two-core cable (for example, RCA pin cable or the like) or a three-core cable (for example, XLR balanced cable or the like) is manufactured by two or three twists, the sound quality is good in terms of hearing. However, if you use a thin wire for the core wire, the highs will come out well, but the lows will feel light and it will sound like the lowests are not coming out. Further, when a thick line is used as the core wire, the low range and the low range are satisfactory, but the high range is not generated. And if it is manufactured with a core wire of an intermediate thickness, the middle range will come out, but the low range and high range will not be as low as the low range of the thick core wire and the high range of the thin core wire. Thus, the entire band could not be satisfactorily covered in terms of hearing.
[0004]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to solve the above-mentioned drawbacks of the conventional single-wire cable while reducing the risk of a disconnection accident and to improve the sound quality while taking advantage of the good sound of the single-wire, thereby enabling satisfactory signal transmission in a sufficiently wide band. It is still another object of the present invention to provide a line cable having various characteristics according to taste and development.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, a line cable according to the present invention includes a core member obtained by twisting at least two core wires at an arbitrary pitch, and a signal wire having a diameter smaller than at least two of the core wires. A signal wire that is twisted at a pitch shorter than the twist pitch, and the signal wire is wound along a concave groove formed by twisting the core wire.
In the present invention, the signal wire preferably has a wire diameter of 0.8 mm or less.
The twist direction of the core wire and the signal wire may be reversed.
Further, the core member may be electrically unused.
The above-mentioned line cable is effective even when used for transmitting not only audio signals but also video signals.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
The present inventor has conducted various tests to investigate the cause of the inability of the conventional single-line cable to cover the required band in high-fidelity audio and the like. As a stranded wire, when this wire is wound as a signal transmission conductor (signal wire) around a thick wire (core wire) that often has a low frequency range, a wire that satisfies the entire band can be obtained as if the respective reproduction bands were added together. I discovered that. In this case, the thick wire is used as a core member for winding the signal wire, and is not electrically used in principle. However, depending on the application, when a wire is used as the core member, it can be used electrically.
[0007]
The reason why it is necessary to use two twists as the signal wire in terms of sound quality is that if one single wire is wound around a core wire having a circular cross section as a signal wire, the contact point between the two becomes linear and the two wires are twisted. When the signal wire is wound, there is a difference in the point of contact. However, when comparing the former single wire and two twisted line cables, there is a big difference in sound quality. It has been found that a two-stranded wire cable is better. The reason for this sound quality improvement is that, when the linear contact is in tight contact, the inherent sound of the signal wire and the core wire works in the direction in which they are dumped without being resonated, It is presumed that the contact is made in such a way that the reverberation and suppression of the respective sounds are performed in an appropriate manner.
[0008]
Then, the above-mentioned two twisted signal wires were wound around various core wires, and further tests were repeated. As a result, it was confirmed that the inherent sound of the core wire was added to the two twisted signal wires. Moreover, by selecting the core wire material, it is possible to control not only the required band such as low band and high band, but also a wide range of timbres such as soft sound, hard sound, loose sound, glittering sound, heavy sound etc. I found that it can be generated.
[0009]
It has been found that a method of winding a twisted signal line around a core wire can provide a line cable having better sound than in the past, but has the following problems.
In actual use of the above line cable, it is necessary to cover or shield, but if a signal wire is wound around a single-core core wire with a circular cross section, any method will be used unless inclusions are used. The signal wire directly contacts the inside of the jacket, which greatly affects the sound quality. Also, the use of inclusions not only causes an increase in cost, but also causes sound quality to deteriorate due to sound quality.
[0010]
Further, there are other problems described below, which cause disturbance of the electrical characteristics of the line cable.
First, the signal wire cannot be wound unless it is tightly wound around the core wire, but if the core wire is soft, the core wire may be twisted.
Further, if the core wire and the signal wire are slippery, it is difficult to twist and wind at a constant pitch, and the twist pitch is not stable. Even if the product is temporarily wound at a constant pitch, the product partially moves during processing or use of the product.
Furthermore, if two signal lines are separated and twisted around a core wire to take up space in order to electrically reduce the capacitance, it is difficult to wind them at a stable twist pitch, and The twist pitch partially moves during processing or use.
[0011]
Therefore, in order to solve these problems, the following measures were taken for the core wire.
That is, by using two or three core wires, twisting them at a required pitch, and winding the two or three twisted signal wires along the resulting twisted concave grooves. The line cable of the present invention is configured.
The above problems could be solved by adopting such a line cable configuration.
[0012]
That is, with the above-described configuration, it is not difficult to form a wire having a circular cross section (for example, a magnet wire) as a core wire by twisting two or three wires. In addition, since the signal wire is wound so as to be sandwiched along the twisted groove, the tension to be wound can be adjusted more than winding around a single-core core wire. Therefore, a signal wire can be wound at a stable pitch even with a slippery core wire or a relatively soft core wire, so that the selection range of usable core wires can be expanded and the control range of the tone can be expanded.
[0013]
Further, by appropriately selecting the wire diameter of the core wire and the signal wire, the distance between the signal wires and the distance between the signal wire and the jacket of the line cable can be controlled. Therefore, the signal wire can be brought into linear contact with the jacket of the line cable, or not. In addition, since the capacitance between the wires can be controlled to some extent, the degree of freedom in designing sound quality and electrical characteristics such as characteristic impedance when a line cable is formed can be increased.
[0014]
FIGS. 1A and 1B to FIGS. 3A and 3B show embodiments of a line cable according to the present invention. In the embodiment shown in each figure, 1 is a core member obtained by twisting two core wires 1a and 1b at a predetermined pitch, and 2 is a signal wire 2a and 2b having a smaller diameter than the two core wires. This is a signal line member that is twisted at a pitch shorter than the twisting pitch of.
[0015]
The signal wires 2a and 2b are wound along a concave groove 3 formed by twisting the core wires 1a and 1b. The sheath of the line cable is not shown.
[0016]
FIG. 4 shows an embodiment of the line cable of the present invention. In the figure, reference numeral 4 denotes a CD player, an FM tuner or the like as a signal source and a preamplifier, 5 denotes a main power amplifier, 6L and 6R denote speakers, and the line cables 7 and 8 for connecting each have the above-described configuration. Since unbalanced input / output terminals are used in 4 and 5, the core members 7a and 8a of each line cable are not electrically used. That is, no electric signal is sent.
[0017]
FIG. 5 shows another embodiment of the line cable of the present invention. Since balanced input / output terminals are used for 4 and 5, the core members 7a and 8a of each line cable are connected to ground potential. use.
[0018]
In order to reproduce the highest frequency sound using the line cable having the above configuration, the signal wire must have a wire diameter of 0.8 mm or less. If a wire with a diameter larger than that is used, high frequencies cannot be obtained. In this case, even if two signal wires are used, the high frequency range does not disappear, and the same is audible, and the strength is increased because the two wires are twisted.
[0019]
Further, the capacitance of the line cable of the present invention can be made as small as that of a coaxial cable, so that it can be used not only for audio analog signals but also for digital signal lines. When a balanced cable was actually made and used in a digital circuit, very good results were obtained.
Further, the twist direction of the signal wire and the core wire may be the same or opposite, but from the viewpoint of contact, the twist directions of both are better.
[0020]
【The invention's effect】
As described above, according to the line cable of the present invention, it is possible to reproduce sound with good audibility in all bands from the low band to the high band, and to produce a desired tone, and to transmit digital signals. Can also be used, and is also effective for transmitting video signals, and the practical effect is remarkable.
[Brief description of the drawings]
FIG. 1 is a view showing one embodiment of the present invention, in which (a) is a side view thereof, and (b) is an enlarged end view of AA.
FIGS. 2A and 2B are diagrams showing another embodiment of the present invention, wherein FIG. 2A is a side view thereof, and FIG. 2B is an enlarged end view taken along line BB.
3A and 3B are views showing still another embodiment of the present invention, wherein FIG. 3A is a side view thereof, and FIG. 3B is a CC enlarged end view.
FIG. 4 is a block diagram showing one embodiment of the present invention.
FIG. 5 is a block diagram of another embodiment of the line cable of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Core member 1a Core wire 1b Core wire 2 Signal wire member 2a Signal wire 2b Signal wire 3 Depressed groove formed by twisting core wire

Claims (4)

A core member obtained by twisting at least two core wires at an arbitrary pitch;
A signal wire having a diameter smaller than at least two of the core wires and twisted at a pitch shorter than the twist pitch of the core wires,
A line cable, wherein the signal wire is wound along a concave groove formed by twisting a core wire. The line cable according to claim 1, wherein the signal wire has a wire diameter of 0.8 mm or less. The line cable according to claim 1, wherein the twist direction of the core wire and the signal wire is reversed. The line cable according to claim 1, wherein the core member is electrically unused.

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