JP2019003764A - Audio cable and speaker connection method - Google Patents

Abstract

To provide an audio cable and a speaker connection method capable of reproducing fine sounds in a wide sound region clearly at high resolution.SOLUTION: An audio cable 10 is constituted by a center conductor 20 arranged at a center, an insulation coating layer 30 covering the center conductor 20, and a plurality of outer layer conductors 40 arranged with layering along an outer periphery of the insulation coating layer 30 and coated by an insulation coating film 42.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an audio cable and a speaker connection method capable of reproducing a delicate sound in a wide sound range such as a high-resolution sound source.

Conventionally, various devices have been devised to clearly reproduce the sound source. For example, the cable described in Patent Document 1 is one of them.
The cable described in Patent Document 1 has a single-core structure in which the core material is formed of a thick aluminum wire, and an air layer is provided between the core material and the insulator and between the insulator and the tube shield. Therefore, compared to conventional audio cables, the sound quality of the reproduced sound is clear, the sound is clear, the SN ratio is high, the sound reverberation and reverberation are closer to the original sound, and the sound quality can be dramatically improved. Yes.

  In recent years, there has been an increasing demand for clear reproduction of high-resolution sound sources, such as high-resolution sound sources, in a broader range and delicate sounds. However, a so-called skin effect occurs in which the signal flowing in the conductor concentrates on the surface of the conductor as the frequency increases.

  When such a skin effect occurs in, for example, a conventional audio cable as described in Patent Document 1, the effective cross-sectional area of a transmission line for a high frequency band signal (hereinafter referred to as a high frequency signal) decreases. It will be. Thus, reducing the effective cross-sectional area of the transmission line is the same as increasing the conductor resistance value, lowering the transmission efficiency of high-frequency signals, and clearly reproducing delicate sounds in a wide sound range. I could not.

JP 2004-220797 A

  Accordingly, an object of the present invention is to provide an audio cable and speaker connection method capable of clearly reproducing a delicate sound in a wide sound range with high resolution.

  The present invention is an audio cable comprising a central conductor arranged in the center and a plurality of outer layer conductors arranged in layers along the outer periphery of the central conductor and covered with an insulating coating film. And

The center conductor and the outer layer conductor may be formed of a single wire or a plurality of conductors. Moreover, when comprised with a some conductor, you may comprise by the twisted wire conductor which twisted together the some conductor.
The audio cable includes a speaker cable that connects a speaker and an output device such as an amplifier, for example, a line cable that connects a preamplifier and a power amplifier, or a power cable.

According to the present invention, a delicate sound in a wide sound range can be clearly reproduced with high resolution.
Specifically, an audio cable is composed of a central conductor arranged in the center and a plurality of outer layer conductors arranged in layers along the outer periphery of the central conductor and covered with an insulating coating film. It is possible to configure a two-layer audio cable having a different configuration between the central conductor and the surface conductor of the cable constituting the path, that is, a different conductor configuration.

  As a result, the mid-low frequency band signal (hereinafter referred to as the mid-low frequency signal) is transmitted through the central conductor disposed in the center, and the high-frequency signal is transmitted through the outer layer conductor on the outer peripheral side. High-frequency signal transmission path is separated from high-frequency signal transmission path, so that high-frequency signal transmission efficiency is not reduced due to the skin effect, unlike conventional audio cables. Can be reproduced clearly.

  In addition, if the sound of the high frequency signal that exceeds the frequency band that can be heard by humans (hereinafter referred to as the audible frequency band) is reproduced, the quality of the reproduced sound tends to be softened. Since a decrease in signal transmission efficiency can be suppressed, a high frequency signal exceeding the audible band can be efficiently transmitted, and a delicate sound in a wide sound range can be reproduced with a soft sound quality.

As an aspect of the present invention, an insulating coating layer that covers the central conductor may be provided.
According to the present invention, a delicate sound in a wide sound range can be reproduced more clearly with high resolution.

  In detail, since the central conductor and the outer layer conductor can be reliably insulated by providing an insulating coating layer covering the central conductor, the transmission path for the middle and low frequency signal and the transmission path for the high frequency signal are reliably separated. It is possible to reproduce delicate sounds in a wide range with high resolution.

As an aspect of the present invention, the insulating coating layer and the insulating coating film may be made of the same material.
According to this invention, since the insulation between the insulating coating layer and the insulating coating film is uniform, the central conductor and the outer layer conductor can be reliably insulated, and the relative dielectric constant between the central conductor and the outer layer conductor can be ensured. Therefore, the signal transmission speed is uniform between the central conductor and the outer conductor, and a delicate sound in a wide sound range can be faithfully reproduced with high resolution.

As an aspect of the present invention, the insulating coating film may be thinner than the insulating coating layer.
According to this invention, it is possible to prevent the cable from being deteriorated by the insulating coating film covering each of the outer layer conductors.

As an aspect of the present invention, the central conductor may be composed of a stranded wire conductor obtained by twisting a plurality of strands.
Thereby, it is possible to configure an audio cable with high handleability.

  Specifically, when the central conductor is configured with a single line, in order to transmit a mid-low range signal with a desired transmission efficiency, it is necessary to secure a cross-sectional area of the conductor as a transmission path, and the single line is configured. The diameter of the central conductor is increased. When the diameter of the central conductor is increased as described above, the flexibility of the central conductor is lowered, so that the flexibility as an audio cable is also lowered, and the handleability is lowered.

  On the other hand, even if the central conductor has a cross-sectional area that ensures transmission by configuring the central conductor with a twisted conductor formed by twisting a plurality of strands, The handleability can be improved without reducing the flexibility of the cable.

As an aspect of the present invention, the stranded wire conductor may be twisted concentrically and the outer layer conductor may be twisted together by concentric lateral winding.
According to the present invention, the central conductor disposed in the center and the plurality of outer layer conductors coated with the insulating coating film constitute a stable two-layer audio cable with the insulating coating layer interposed therebetween. be able to. Therefore, even if the cable for audio is bent, a delicate sound in a wide sound range can be faithfully reproduced with high resolution.

As an aspect of the present invention, the number of the strands constituting the stranded conductor may be larger than the number of the outer layer conductors, and the sectional diameter of the strands may be equal to or smaller than the sectional diameter of the outer layer conductor.
According to the present invention, even when the cable is bent, the stranded conductor whose number is larger than the number of the outer layer conductors and whose cross-sectional diameter is less than or equal to the cross-sectional diameter of the outer layer conductor follows the bending of the cable. Therefore, the stranded wire conductor and the outer layer conductor can be reliably insulated by the insulating coating layer without locally applying a load to the insulating coating layer covering the central conductor formed of the stranded wire conductor. Accordingly, it is possible to faithfully reproduce delicate sounds in a wide sound range with high resolution.

As an aspect of the present invention, the cross-sectional area of the central conductor and the total cross-sectional area of the outer layer conductor may be approximately the same.
As a result, the transmission efficiency of the mid-low frequency signal transmitted through the central conductor and the transmission efficiency of the high frequency signal transmitted through the outer layer conductor are aligned, so that delicate sounds in a wide sound range are faithfully reproduced with high resolution. be able to.

  Further, as an aspect of the present invention, the outer conductor is a composite conductor in which a central conductor made of copper or a copper alloy and a silver or silver alloy outer conductor placed on the outer periphery of the central conductor are integrated. And an insulating coating film covering the outside of the composite conducting wire.

  According to the present invention, the transmitted high-frequency signal is also transmitted on the outer peripheral side of the composite conductor due to the skin effect. In the composite conductor, the outer peripheral conductor made of silver or silver alloy disposed on the outer peripheral side of the central conductor is made of copper. Or since the transmission efficiency is higher than that of the central conductor portion made of copper alloy, it is possible to faithfully reproduce a delicate sound in a wide sound range with a higher resolution.

The present invention also includes a central conductor disposed in the center, an insulating coating layer covering the central conductor, and a plurality of outer layer conductors disposed in layers along the outer periphery of the insulating coating layer and covered with an insulating coating film. A plurality of double-layer cable conductors configured as described above are arranged and are audio cables covered with a sheath.
According to the present invention, an audio cable having a plurality of transmission paths can be configured.

In addition, the present invention is a speaker connection method in which the outer layer conductor in the audio cable is connected to a high frequency terminal of a speaker, and the central conductor is connected to a low frequency terminal.
According to the present invention, a bi-wiring connection in which the high frequency signal is transmitted by the outer layer conductor and the middle low frequency signal is transmitted by the central conductor can be realized by a single audio cable.

  According to the present invention, it is possible to provide an audio cable and a speaker connection method capable of clearly reproducing a delicate sound in a wide sound range with high resolution.

The schematic perspective view of the cable for audio. The expanded sectional view of the cable for audio. The expanded sectional view of the cable for audios of another embodiment. Schematic of speaker connection using audio cable. Furthermore, the expanded sectional view of the cable for audios of another embodiment. Furthermore, the expanded sectional view of the cable for audios of another embodiment.

An embodiment of the present invention will be described in detail with reference to the drawings.
1 shows a schematic perspective view of the audio cable 10, FIG. 2 shows an enlarged sectional view of the audio cable 10, FIG. 3 shows an enlarged sectional view of the audio cable 10 using the outer layer conductor 40a, FIG. 4 shows a schematic diagram of speaker connection using the audio cable 10.

  The audio cable 10 of the present invention includes a central conductor 20 disposed in the center, an insulating coating layer 30 covering the central conductor 20, and a layered configuration along the outer periphery of the insulating coating layer 30. And a plurality of outer layer conductors 40 covered with.

  More specifically, the audio cable 10 is layered along a plurality of central conductors 20 disposed at the center, an insulating coating layer 30 that integrally covers the plurality of central conductors 20, and an outer periphery of the insulating coating layer 30. A plurality of outer layer conductors 40 disposed and covered with an insulating coating film 42 and a sheath 50 covering the outermost periphery are formed.

The center conductor 20 is composed of a stranded conductor 21 in which a plurality of strands 22 are concentrically twisted, and is further concentrically twisted and integrated.
In this embodiment, 37 strands 22 made of PC-TripleC (registered trademark) having a cross-sectional diameter R2 of 0.26 mm are concentrically stranded, and the stranded wire conductor 21 has an outer diameter of approximately 1.82 mm. The central conductor 20 is comprised by this.

  The outer layer conductor 40 has a diameter larger than that of the strand 22 and is an insulating single wire in which a conducting wire 41, which is a single wire, is formed of the same material as the insulating coating layer 30 described later but is coated with a thin insulating coating film 42. It is composed.

  In this embodiment, a conductor 41 made of PC-TripleC (registered trademark) having a cross-sectional diameter R1 of 0.50 mm is covered with an insulating coating film 42 made of PFA (polytetrafluoroethylene) having a thickness of 0.15 mm. Thus, the outer layer conductor 40 having an outer diameter of 0.80 mm is formed. In addition, as the strand 22 and the conducting wire 41, you may comprise not only the product made from PC-TripleC (trademark) but a highly conductive copper electric wire, a copper alloy electric wire, an aluminum electric wire, or an aluminum alloy electric wire.

  As described above, the central conductor 20 composed of the stranded wire conductor 21 in which a plurality of strands 22 are concentrically stranded is covered with the insulating coating layer 30, and a plurality of outer layers are formed along the outer periphery of the insulating coating layer 30. The audio cable 10 is configured by arranging the conductors 40, twisting them together with concentric horizontal windings, and covering them with a sheath 50.

In the present embodiment, the insulating coating layer 30 is made of PFA having a thickness of 0.20 mm, and the sheath 50 is made of a vibration-resistant polyolefin containing a damping material having a thickness of 1.1 mm.
In addition, the audio cable 10 is configured by twisting the twelve outer layer conductors 40 in a concentric lateral winding along the outer periphery of the insulating coating layer 30 that integrally covers the stranded conductor 21 composed of the strands 22. ing.

  In the above description, the outer layer conductor 40 has a diameter larger than that of the strand 22, and a conductive wire 41 made of copper or a copper alloy such as PC-TripleC (registered trademark) is connected to the insulating coating layer 30 described later. Although it is made of an insulating single wire made of the same material but covered with a thin insulating coating film 42, for example, instead of the conductive wire 41, for example, PC-TripleC (registered trademark) as shown in FIG. A composite conductor 41a in which a copper or copper alloy central conductor 41aa and a silver or silver alloy peripheral conductor 41ab disposed on the outer periphery of the central conductor 41aa are integrated together with the outside of the composite conductor 41a. Alternatively, the outer layer conductor 40a may be used which is formed of an insulating composite single wire by covering with an insulating coating film 42.

  At this time, the central conductor 41aa and the outer conductor 41ab constituting the composite conductor 41a have a ratio of the center conductor 41aa and the outer conductor 41ab within the range of 5: 5 to 9: 1 in the cross-sectional diameter R1. It is comprised so that it may become. The outer peripheral conductor 41ab made of silver or silver alloy has higher conductivity than the central conductor 41aa made of copper or copper alloy, but is expensive. In the embodiment shown in FIG. 3, the ratio of the central conductor 41aa and the outer conductor 41ab is set to 7: 3 within the range of 5: 5 to 9: 1.

  Thus, the audio cable 10 is arranged in a layered manner along the outer periphery of the insulating coating layer 30, the central conductor 20 disposed in the center, the insulating coating layer 30 covering the central conductor 20, and the insulating coating film 42. Since it is composed of a plurality of coated outer layer conductors 40 (40a), a delicate sound in a wide sound range can be clearly reproduced with high resolution.

  Specifically, the central conductor 20 disposed in the center, the insulating coating layer 30 covering the central conductor 20, and a plurality of outer layers disposed in layers along the outer periphery of the insulating coating layer 30 and covered with the insulating coating film 42. Since it is configured with the conductor 40 (40a), the configuration differs between the central conductor 20 disposed at the center of the cable constituting the transmission path and the outer layer conductor 40 (40a) disposed on the surface (outside). That is, the audio cable 10 having a two-layer structure with different conductor configurations can be configured.

  As a result, the mid-low frequency signal is transmitted through the central conductor 20 disposed in the center, and the high-frequency signal is transmitted through the outer layer conductor 40 (40a) on the outer peripheral side. Because the transmission signal is separated from the transmission path of the high-frequency signal, the delicate sound in the wide sound range is cleared with high resolution without reducing the transmission efficiency of the high-frequency signal due to the skin effect, unlike the conventional audio cable. Can be reproduced.

  In addition, when the sound by the high frequency signal exceeding the audible band that can be heard by humans is reproduced, the sound quality of the reproduced sound tends to be soft. However, the audio cable 10 is formed by the outer layer conductor 40 (40a). A reduction in transmission efficiency of high frequency signals due to the skin effect can be suppressed, high frequency signals exceeding the audible band can be efficiently transmitted, and delicate sounds in a wide sound range can be reproduced with soft sound quality.

In addition, since the center conductor 20 is comprised with the twisted wire conductor 21 which twisted together the some strand 22, the audio cable 10 with high handleability can be comprised.
Specifically, when the central conductor is composed of a single wire, it is necessary to secure the cross-sectional area of the conductor as a transmission path in order to transmit a predetermined middle / low frequency signal with a desired transmission efficiency. The diameter of the center conductor to be increased. When the diameter of the central conductor is increased as described above, the flexibility of the central conductor is lowered, so that the flexibility as an audio cable is also lowered, and the handleability is lowered.

  On the other hand, since the central conductor 20 is composed of the stranded conductor 21 formed by twisting a plurality of strands 22, even the central conductor 20 having a cross-sectional area that secures transmission is flexible. The handleability can be improved without lowering the flexibility of the audio cable 10.

  In addition, the stranded wire conductor 21 constituting the central conductor 20 is composed of a concentric twisted strand 22 and the outer layer conductor 40 (40a) is twisted by concentric lateral winding, so that the central conductor 20 disposed in the center is provided. The plurality of outer layer conductors 40 (40a) covered with the insulating coating film 42 can constitute the stable audio cable 10 having the two-layer structure with the insulating coating layer 30 interposed therebetween. Therefore, even if the audio cable 10 is bent, a delicate sound in a wide sound range can be faithfully reproduced with high resolution.

  Further, the number of the strands 22 constituting the stranded conductor 21 (37 in the present embodiment) is larger than the number of the outer layer conductors 40 (40a) (12 in the present embodiment), and the sectional diameter R2 of the strand 22 (In this embodiment, 0.26 mm) is equal to or smaller than the cross-sectional diameter R1 (0.50 mm in this embodiment) of the conducting wire 41 (composite conducting wire 41a) in the outer layer conductor 40 (40a), so the audio cable 10 is curved. Even in such a case, the stranded wire conductor 21 in which the number of the outer layer conductors 40 (40a) is greater than the number of the outer layer conductors 40 (40a) and the section diameter R2 of the strands 22 is equal to or smaller than the section diameter R1 of the outer layer conductors 40 (40a) Follow.

  Therefore, the central conductor 20 and the outer layer conductor 40 (40a) are securely connected by the insulating coating layer 30 without locally applying a load to the insulating coating layer 30 covering the central conductor 20 formed of the stranded wire conductor 21. Can be insulated. Accordingly, it is possible to faithfully reproduce delicate sounds in a wide sound range with high resolution.

  Further, since the cross-sectional area of the central conductor 20 and the total cross-sectional area of the outer layer conductor 40 (40a) are approximately the same, the transmission efficiency of the mid-low range signal transmitted through the central conductor 20 and the outer layer conductor 40 (40a) Since the transmission efficiency of the high-frequency signal transmitted is uniform, it is possible to faithfully reproduce delicate sounds in a wide sound range with high resolution.

  However, in order to suppress the high frequency range in the output sound, that is, to apply the low frequency range, the total cross-sectional area of the outer layer conductor 40 (40a) is made smaller than the cross-sectional area of the central conductor 20, and conversely the output In order to suppress the low frequency range that is generated, that is, to apply the high frequency range, the total cross-sectional area of the outer layer conductor 40 (40a) is increased as compared with the cross-sectional area of the central conductor 20, for example, the total disconnection of the outer layer conductor 40 (40a). The sound output can be tuned by the ratio of the area and the cross-sectional area of the central conductor 20.

  Further, since the insulating coating layer 30 and the insulating coating film 42 are made of the same material, PFA, the insulation properties of the insulating coating layer 30 and the insulating coating film 42 are uniform. 40 (40a) is reliably insulated, and a delicate sound in a wide sound range can be faithfully reproduced with high resolution.

Note that the insulating coating film 42 that covers the conductive wire 41 (composite conductive wire 41a) and the insulating coating layer 30 that integrally covers the stranded wire conductor 21 in which a plurality of strands 22 are concentrically stranded are both made of PFA. However, it may be made of PE or PP.
However, compared to other PE and PP insulating materials, the insulating coating film 42 and the insulating coating layer 30 made of PFA have a low relative dielectric constant, so that the transmission efficiency of both high-frequency signals and mid-low frequency signals is high. Since the transmission speed of the mid-low frequency signal transmitted through the central conductor 20 and the transmission speed of the high frequency signal transmitted through the outer layer conductor 40 (40a) are aligned, it is possible to faithfully reproduce delicate sounds in a wide sound range with high resolution. Can be reproduced.

  Further, since the insulating coating film 42 is thinner than the insulating coating layer 30, the insulating coating film 42 that covers each of the outer conductors 40 (40a) prevents the bendability of the audio cable 10 from being lowered. it can.

  More specifically, the conductive wire 41 (composite conductive wire 41a) covering the insulating coating film 42 reduces the insulating property of the insulating coating layer 30 that ensures insulation while covering a plurality of strands 22 together. Even in this case, it is configured to ensure insulation between the central conductor 20 and the insulating coating film 42, that is, to provide more reliable insulation by the insulating coating layer 30. Therefore, it is configured as thin as possible.

  Thereby, the flexibility fall of the outer layer conductor 40 (40a) by the insulating coating film 42 can be suppressed, the plurality of strands 22 are collectively covered with the insulating coating layer 30, and the outer layer conductor 40 ( The flexibility of the audio cable 10 configured by twisting 40a) by concentric horizontal winding can be ensured.

  Moreover, instead of the conducting wire 41, for example, a central conducting wire portion 41aa made of copper or copper alloy such as PC-TripleC (registered trademark), and an outer circumferential conducting wire portion made of silver or silver alloy arranged on the outer peripheral side of the central conducting wire portion 41aa The outer side of the composite conducting wire 41a integrated with 41ab is covered with an insulating coating film 42 to form an insulating composite single wire, and in the outer layer conductor 40a to which the high frequency signal is transmitted, the high frequency signal transmitted is the composite conductive wire. Also in 41a, the outer peripheral side is transmitted by the skin effect, and in the composite conductor 41a, the outer peripheral conductor 41ab made of silver or silver alloy disposed on the outer peripheral side of the central conductor 41aa is the central conductor 41aa made of copper or copper alloy. Since the transmission efficiency is higher, it is possible to faithfully reproduce delicate sounds in a wide sound range with higher resolution.

  Also, in the case of a silver-plated electric wire plated with silver on the outer surface of the central conductor portion 41aa, the outer surface of the central conductor portion 41aa and the plating layer may bite into each other, which may reduce the transmission efficiency of the high frequency signal. A composite conducting wire 41a in which a central conducting wire portion 41aa made of copper alloy and an outer circumferential conducting wire portion 41ab made of silver or silver alloy arranged on the outer peripheral side of the central conducting wire portion 41aa are integrated with the outer surface and the outer circumference of the central conducting wire portion 41aa. Since the boundary surface with the inner surface of the conductor portion 41ab is smooth, the high-frequency signal is transmitted through the outer peripheral conductor portion 41ab made of silver or silver alloy with high transmission efficiency without lowering the transmission efficiency of the high-frequency signal, Delicate sound can be faithfully reproduced with higher resolution in a wide range.

  The central conductor 41aa and the outer conductor 41ab constituting the composite conductor 41a have a ratio of the central conductor 41aa and the outer conductor 41ab in the range of 5: 5 to 9: 1 in the cross-sectional diameter R1. However, when the ratio between the central conductor 41aa and the outer conductor 41ab exceeds the range of 5: 5 to 9: 1, in addition to the above-described effects, it is cost effective for audio. The cable 10 cannot be obtained.

  Specifically, when the ratio exceeds the above range so that the ratio is 9.5: 0.5, the thickness of the outer peripheral conductor portion 41ab is thin even if a high frequency signal is transmitted on the outer peripheral side of the composite conductor 41a. The transmission efficiency cannot be improved by the outer peripheral conductor 41ab.

  On the contrary, when the ratio is less than the above range so that the ratio is 4: 6, the transmission efficiency of the high frequency signal transmitted on the outer peripheral side of the composite conductive wire 41a by the outer peripheral conductor portion 41ab can be improved, but it is made of copper. Alternatively, the peripheral conductor 41ab made of silver or silver alloy is more expensive than the central conductor 41aa made of copper alloy, so that the cost-effectiveness of the audio cable 10 for improving transmission efficiency is lowered. Therefore, when the ratio between the central conductor 41aa and the outer conductor 41ab exceeds the range of 5: 5 to 9: 1, it is possible to obtain a cost-effective audio cable 10 in addition to the effects described above. Can not.

  Next, the speaker connection using the audio cable 10 configured as described above, which has high transmission efficiency of high-frequency signals and mid-low frequency signals, and can faithfully reproduce delicate sounds in a wide sound range with high resolution. Will be described with reference to FIG.

  Further, in order to connect a speaker using the audio cable 10, the connection terminal 60 is attached to each of the outer layer conductor 40 (40 a) and the central conductor 20 on one end side of the audio cable 10, and the other end of the audio cable 10 is connected. At the side, the central conductor 20 and the outer layer conductor 40 (40a) are put together and the connection terminal 60 is attached.

  Then, as shown in FIG. 4, the connection terminal 60 on the other end side of the audio cable 10 is connected to either Hot or Cold in the output terminal 111 of the output device 110 such as a power amplifier, and the outer layer on one end side. The connection terminal 60 attached to the conductor 40 (40a) is connected to either Hot or Cold in the high-frequency terminal 101 of the speaker 100, and the connection terminal 60 attached to the central conductor 20 is connected to Hot in the low-frequency terminal 102. Or it connects to either one of Cold. This is performed for both Hot and Cold, and the speaker 100 and the output device 110 are connected.

  In the speaker connection using the audio cable 10 as described above, the high-frequency signal is transmitted by the outer layer conductor 40 (40a) and the mid-low frequency signal is transmitted by the central conductor 20, so that the high-frequency signal transmission cable is used. Can be realized by one audio cable 10 for each of Hot and Cold.

  In addition, although the outer layer conductor 40 (40a) and the high frequency terminal 101 and the central conductor 20 and the low frequency terminal 102 are connected using the connection terminal 60, the outer layer conductor 40 (40a) is used without using the connection terminal 60. ) May be connected to the high frequency terminal 101 and the central conductor 20 may be connected to the low frequency terminal 102.

  When the output terminal 111 in the output device 110 is provided with a high-frequency output terminal and a medium-low frequency output terminal, the outer layer conductor 40 (40a) and the central conductor 20 are provided on the other end side of the audio cable 10. Bi-wiring connection can be made by attaching the connection terminal 60 to each of them, or by connecting them directly to the output terminal for high frequency and the output terminal for middle and low frequency in the output device 110.

  In addition, a short jumper plate or a jumper wire is attached to the speaker 100 in which the input terminal is provided without the high frequency terminal 101 or the low frequency terminal 102, or the high frequency terminal 101 and the low frequency terminal 102. When connecting to the speaker 100, the outer layer conductor 40 (40 a) and the central conductor 20 are collectively attached to both ends of the audio cable 10 and the connection terminal 60 is attached, and the connection terminal 60 on the other end of the audio cable 10 is connected to the power. Connected to either Hot or Cold at the output terminal 111 of the output device 110 such as an amplifier, and connected to one of Hot or Cold at the input terminal of the speaker 100 with the connection terminal 60 attached to one end side. For both Hot and Cold Connecting the 100 and output device 110.

  Even in the speaker connection using the audio cable 10 as described above, the high-frequency signal is transmitted by the outer layer conductor 40 (40a) and the middle-low frequency signal is transmitted by the central conductor 20, so that the transmission of the high-frequency signal is performed. The bi-wiring connection, which is connected by the cable for transmission and the cable for transmission of the mid-low range signal, can be realized by one audio cable 10 for each of Hot and Cold.

  In the above description, the central conductor 20 composed of the stranded wire conductor 21 in which a plurality of strands 22 are concentrically twisted is covered with the insulating coating layer 30, and a plurality of wires are provided along the outer periphery of the insulating coating layer 30. The outer-layer conductor 40 (40a) is arranged, twisted by concentric horizontal winding, and covered with the sheath 50 to form the audio cable 10. However, the audio cable 1 is formed by including a plurality of two-layer cable conductors 10a. It may be configured.

  Specifically, as shown in FIG. 5, the audio cable 1 is formed by covering a central conductor 20 composed of a stranded wire conductor 21 in which a plurality of strands 22 are concentrically stranded with an insulating coating layer 30. A plurality of outer layer conductors 40 (40a) covered with an insulating coating film 42 are arranged along the outer periphery of the covering layer 30, and twisted by concentric lateral winding to form a two-layer cable conductor 10a. The two-layer cable conductor 10a is twisted in two cores, an intervening 71 made of silk yarn is disposed, and the paper tape 72 is pressed and wound together, and the outside is covered with a sheath 50.

  As described above, the audio cable 1 in which a plurality of the two-layer cable conductors 10a are arranged and covered with the sheath 50 includes a plurality of transmission paths. Therefore, although not shown, the outer layer conductor 40 (40a) in each of the two two-layer cable conductors 10a constituting the audio cable 1 is connected to the high-frequency terminal 101 of the speaker 100 and the center conductor 20 is lowered. By connecting to the area terminal 102, the bi-wiring connection can be realized with the single audio cable 1 for both Hot and Cold.

The present invention is not limited to the configuration of the above-described embodiment, but can be applied based on the technical idea shown in the claims, and many embodiments can be obtained.
For example, in the above description, as an example, the central conductor 20 composed of the stranded wire conductor 21 in which a plurality of strands 22 are concentrically stranded is covered with the insulating coating layer 30, and along the outer periphery of the insulating coating layer 30. A plurality of outer layer conductors 40 (40a) are arranged, twisted by concentric lateral winding, and covered with a sheath 50. However, the central conductor 20 may be formed of a single wire, or the outer layer conductor 40 (40a). May be composed of a stranded conductor.

  Further, the number of strands of strands 22 in the strand conductor 21 constituting the central conductor 20, the number of outer layer conductors 40 (40a), the section diameter R2 of the strands 22 and the section diameter R1 of the conductor 41, The materials and thicknesses of the insulating coating layer 30 and the insulating coating film 42 may be appropriately set within the scope of the technical idea of the present invention.

  Further, as shown in FIG. 6, a plurality of outer layer conductors 40 (40 a) covered with an insulating coating film 42 are formed along the outer periphery of the central conductor 20 without covering the central conductor 20 with an insulating coating layer. They may be arranged, twisted by concentric horizontal winding, covered with a sheath 50, and used as a line cable.

DESCRIPTION OF SYMBOLS 1,10 ... Audio cable 10a ... Double-layer cable conductor 20 ... Central conductor 21 ... Twisted wire conductor 22 ... Elementary wire 30 ... Insulation coating layer 40 (40a) ... Outer layer conductor 42 ... Insulation coating film 50 ... Sheath 100 ... Speaker 101 ... High-frequency terminal 102 ... Low-frequency terminal R1 ... Outer conductor cross-sectional diameter R2 ... Strand cross-sectional diameter

Claims (11)

A central conductor located in the center;
An audio cable comprising a plurality of outer layer conductors arranged in layers along the outer periphery of the central conductor and covered with an insulating coating film. The audio cable according to claim 1, further comprising an insulating coating layer covering the center conductor. The audio cable according to claim 2, wherein the insulating coating layer and the insulating coating film are made of the same material. The audio cable according to claim 2, wherein the insulating coating film is thinner than the insulating coating layer. The audio cable according to any one of claims 1 to 4, wherein the central conductor is formed of a stranded conductor formed by twisting a plurality of strands. The stranded wire conductor is concentric stranded,
The audio cable according to claim 5, wherein the outer layer conductor is twisted by concentric horizontal winding. The number of the strands constituting the stranded conductor is greater than the number of the outer layer conductors,
The audio cable according to claim 5 or 6, wherein a cross-sectional diameter of the element wire is equal to or smaller than a cross-sectional diameter of the outer layer conductor. The audio cable according to claim 1, wherein a cross-sectional area of the center conductor and a total cross-sectional area of the outer layer conductor are approximately the same. The outer layer conductor is
A central conducting wire made of copper or a copper alloy and a composite conducting wire in which an outer conducting wire made of silver or a silver alloy disposed on the outer peripheral side of the central conducting wire is integrated;
The audio cable according to any one of claims 1 to 8, comprising an insulating coating film covering an outer side of the composite conducting wire. A plurality of two-layer cable conductors, each of which is composed of a central conductor arranged at the center and a plurality of outer layer conductors arranged in a layer along the outer periphery of the central conductor and covered with an insulating coating film, are arranged in a sheath. Covered audio cable. The speaker connection method which connects the said outer layer conductor in the audio cable in any one of Claims 1 thru | or to the terminal for high regions of a speaker, and connects the said center conductor to the terminal for low regions.

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