JP6939324B2 - Coaxial wire and multi-core cable - Google Patents

Coaxial wire and multi-core cable Download PDF

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JP6939324B2
JP6939324B2 JP2017183473A JP2017183473A JP6939324B2 JP 6939324 B2 JP6939324 B2 JP 6939324B2 JP 2017183473 A JP2017183473 A JP 2017183473A JP 2017183473 A JP2017183473 A JP 2017183473A JP 6939324 B2 JP6939324 B2 JP 6939324B2
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盛治 田中
盛治 田中
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Sumitomo Electric Industries Ltd
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本発明は、同軸電線および多心ケーブルに関する。 The present invention relates to coaxial electric wires and multi-core cables.

特許文献１には、編組したシールド層の素線導体に銀メッキを施した素線を用いた多心ケーブルが開示されている。特許文献２には、医療機器用のケーブルの導体として、強度と導電性に優れた硬銅線が用いられていると記載されている。 Patent Document 1 discloses a multi-core cable using a wire wire in which a wire wire of a braided shield layer is plated with silver. Patent Document 2 describes that a hard copper wire having excellent strength and conductivity is used as a conductor of a cable for a medical device.

特開２０１３−２５１２５７号公報Japanese Unexamined Patent Publication No. 2013-251257 特開２００９−９７０３３号公報JP-A-2009-97033

細径の同軸電線（同軸ケーブル）や当該同軸電線が含まれる多心ケーブルに対して、さらなる耐捻回性および導電性に優れたものが要求されている。 A coaxial electric wire (coaxial cable) having a small diameter and a multi-core cable including the coaxial electric wire are required to have further excellent twist resistance and conductivity.

本発明は、耐捻回性および導電性に優れた同軸電線および多心ケーブルを提供することを目的とする。 An object of the present invention is to provide a coaxial electric wire and a multi-core cable having excellent twist resistance and conductivity.

本発明の一態様に係る同軸電線は、
中心導体の周囲に、絶縁層、外部導体及び外被が同軸状に順次積層された同軸電線であって、
前記外部導体は複数の素線で構成されており、
前記素線は、引張強さが３２０ＭＰａ以上、かつ破断伸びが１０％以上の銅合金線である。 The coaxial electric wire according to one aspect of the present invention is
A coaxial electric wire in which an insulating layer, an outer conductor, and a jacket are sequentially laminated coaxially around the central conductor.
The outer conductor is composed of a plurality of strands.
The strand is a copper alloy wire having a tensile strength of 320 MPa or more and a breaking elongation of 10% or more.

また、本発明の一態様に係る多心ケーブルは、上記の同軸電線を複数本と、
前記複数本の同軸電線を樹脂によって押出被覆したケーブル外被と、を備える。 Further, the multi-core cable according to one aspect of the present invention includes a plurality of the above coaxial electric wires.
A cable jacket in which the plurality of coaxial electric wires are extruded and coated with a resin is provided.

上記発明によれば、耐捻回性および導電性に優れた同軸電線および多心ケーブルを提供することができる。 According to the above invention, it is possible to provide a coaxial electric wire and a multi-core cable having excellent twist resistance and conductivity.

本実施形態に係る同軸電線の構成を示す斜視図である。It is a perspective view which shows the structure of the coaxial electric wire which concerns on this embodiment. 本実施形態に係る多心ケーブルの構成を示す断面図である。It is sectional drawing which shows the structure of the multi-core cable which concerns on this embodiment. 捻回試験の模式図である。It is a schematic diagram of a twist test.

（本発明の実施形態の説明）
最初に本発明の実施態様を列記して説明する。
本発明の一態様に係る同軸電線は、
（１）中心導体の周囲に、絶縁層、外部導体及び外被が同軸状に順次積層された同軸電線であって、
前記外部導体は複数の素線で構成されており、
前記素線は、引張強さが３２０ＭＰａ以上、かつ破断伸びが１０％以上の銅合金線である。
上記構成によれば、外部導体を構成する素線を、引張強さが３２０ＭＰａ以上、かつ破断伸びが１０％以上の銅合金線とすることにより、耐捻回性および導電性に優れた同軸電線とすることができる。 (Explanation of Embodiments of the Present Invention)
First, embodiments of the present invention will be listed and described.
The coaxial electric wire according to one aspect of the present invention is
(1) A coaxial electric wire in which an insulating layer, an outer conductor, and an outer cover are sequentially laminated coaxially around the central conductor.
The outer conductor is composed of a plurality of strands.
The strand is a copper alloy wire having a tensile strength of 320 MPa or more and a breaking elongation of 10% or more.
According to the above configuration, the coaxial wire having excellent torsional resistance and conductivity is formed by using a copper alloy wire having a tensile strength of 320 MPa or more and a breaking elongation of 10% or more as the wire constituting the outer conductor. Can be.

（２）前記中心導体は、０．０１ｍｍ２以上０．０５ｍｍ２以下の断面積を有してもよい。
上記構成によれば、同軸電線を細径にすることができる。 (2) The central conductor may have a cross-sectional area of 0.01 mm 2 or more and 0.05 mm 2 or less.
According to the above configuration, the coaxial wire can have a small diameter.

（３）前記素線の外径が０．０３ｍｍ以上０．０５ｍｍ以下であってもよい。
上記構成によれば、細径の同軸電線とすることができる。 (3) The outer diameter of the wire may be 0.03 mm or more and 0.05 mm or less.
According to the above configuration, a coaxial electric wire having a small diameter can be obtained.

また、本発明の一態様に係る多心ケーブルは、
（４）上記（１）から（３）に記載の同軸電線を複数本と、
前記複数本の同軸電線を樹脂によって押出被覆したケーブル外被と、を備える。
上記構成によれば、耐捻回性および導電性に優れた多心ケーブルとすることができる。 Further, the multi-core cable according to one aspect of the present invention is
(4) A plurality of coaxial electric wires according to (1) to (3) above,
A cable jacket in which the plurality of coaxial electric wires are extruded and coated with a resin is provided.
According to the above configuration, a multi-core cable having excellent twist resistance and conductivity can be obtained.

（本発明の実施形態の詳細）
本発明の実施形態に係る同軸電線および多心ケーブルの具体例を、以下に図面を参照しつつ説明する。
なお、本発明はこれらの例示に限定されるものではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 (Details of Embodiments of the present invention)
Specific examples of the coaxial electric wire and the multi-core cable according to the embodiment of the present invention will be described below with reference to the drawings.
It should be noted that the present invention is not limited to these examples, and is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

図１は、同軸電線の一例を示す斜視図であり、同軸電線の各部材を段階的に露出させた同軸電線の端部を示す。
図１に示すように、同軸電線１は、中央に配置された中心導体１０と、中心導体１０の周囲に配置された絶縁層２０と、絶縁層２０の周囲に配置された外部導体３０と、外部導体３０の周囲に配置された外被４０とを備えている。中心導体１０、絶縁層２０、外部導体３０、および外被４０は、同軸状に順次積層されている。 FIG. 1 is a perspective view showing an example of a coaxial electric wire, and shows an end portion of the coaxial electric wire in which each member of the coaxial electric wire is exposed stepwise.
As shown in FIG. 1, the coaxial electric wire 1 includes a central conductor 10 arranged in the center, an insulating layer 20 arranged around the central conductor 10, and an outer conductor 30 arranged around the insulating layer 20. It includes an outer cover 40 arranged around the outer conductor 30. The central conductor 10, the insulating layer 20, the outer conductor 30, and the outer cover 40 are sequentially laminated coaxially.

中心導体１０は、例えば導電性金属の細径線材を複数（本例では７本）撚り合わせることによって形成されている。細径線材としては、硬銅線１１を用いることが好ましい。中心導体１０の断面積は、０．０１ｍｍ２以上０．０５ｍｍ２以下としてもよく、これはＡＷＧ（Ａｍｅｒｉｃａｎ Ｗｉｒｅ Ｇａｕｇｅ）規格の＃３７〜＃３０に相当する。なお、細径線材として、硬銅線の他に例えば銅合金線や軟銅線等を用いてもよい。 The central conductor 10 is formed by, for example, twisting a plurality of (7 wires in this example) small-diameter wires of a conductive metal. As the small diameter wire, it is preferable to use the hard copper wire 11. The cross-sectional area of the center conductor 10 may be 0.01 mm 2 or more 0.05 mm 2 or less, which corresponds to # 37 to # 30 of AWG (American Wire Gauge) standard. In addition to the hard copper wire, for example, a copper alloy wire, an annealed copper wire, or the like may be used as the small diameter wire.

絶縁層２０は、例えばＦＥＰ（テトラフルオロエチレン・ヘキサフルオロプロピレン共重合体）、ＰＦＡ（テトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体）等のフッ素系樹脂で形成されている。絶縁層２０の外径は、０．０７ｍｍ以上０．２０ｍｍ以下程度である。 The insulating layer 20 is formed of a fluororesin such as FEP (tetrafluoroethylene / hexafluoropropylene copolymer) or PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer). The outer diameter of the insulating layer 20 is about 0.07 mm or more and 0.20 mm or less.

外部導体３０は、導電性を有する複数の金属素線３１によって構成されている。金属素線３１は、引張強さが３２０ＭＰａ以上である。かつ、金属素線３１の破断伸びは１０％以上である。金属素線３１は、絶縁層２０の周囲に複数本が横巻き（本例では螺旋巻き）されている。金属素線３１の外径は、例えば０．０３ｍｍ以上０．０５ｍｍ以下である。 The outer conductor 30 is composed of a plurality of conductive metal strands 31. The metal wire 31 has a tensile strength of 320 MPa or more. Moreover, the breaking elongation of the metal wire 31 is 10% or more. A plurality of metal strands 31 are horizontally wound (spiral wound in this example) around the insulating layer 20. The outer diameter of the metal wire 31 is, for example, 0.03 mm or more and 0.05 mm or less.

外被４０は、同軸電線１の最外層であり、例えばＥＴＦＥ（エチレン−テトラフルオロエチレン共重合体）、ＦＥＰ、ＰＦＡ等のフッ素系樹脂やＰＥＴ（ポリエチレンテレフタレート）などのポリエステルテープ巻きで構成されている。外被４０の厚さは、０．０１ｍｍ〜０．０３ｍｍ程度である。 The outer cover 40 is the outermost layer of the coaxial electric wire 1, and is composed of, for example, a fluororesin such as ETFE (ethylene-tetrafluoroethylene copolymer), FEP, PFA, or a polyester tape wound such as PET (polyester terephthalate). There is. The thickness of the outer cover 40 is about 0.01 mm to 0.03 mm.

同軸電線１は、例えば電子機器などに用いられ、筐体間を電気的に接続する通信用の同軸電線としても用いることができる。 The coaxial electric wire 1 is used in, for example, an electronic device, and can also be used as a coaxial electric wire for communication that electrically connects the housings.

同軸電線１は、引張強さが３２０ＭＰａ以上で、破断伸びが１０％以上の複数の金属素線３１で形成された外部導体３０を備えている。このため、外部導体３０の引張強さと破断伸びとのバランスがよいので、細径であっても優れた耐捻回性と導電性とを得ることができる。また例えば、中心導体１０の断面積を０．０１ｍｍ２以上０．０５ｍｍ２以下とすることにより、同軸電線１を細径とすることができる。さらに例えば金属素線３１の外径を０．０３ｍｍ以上０．０５ｍｍ以下とすることにより同軸電線１を細径とすることができる。 The coaxial electric wire 1 includes an outer conductor 30 formed of a plurality of metal strands 31 having a tensile strength of 320 MPa or more and a breaking elongation of 10% or more. Therefore, since the tensile strength of the outer conductor 30 and the elongation at break are well-balanced, excellent twist resistance and conductivity can be obtained even with a small diameter. Further, for example, by the cross-sectional area of the central conductor 10 and the 0.01 mm 2 or more 0.05 mm 2 or less, it can be a coaxial cable 1 with a small diameter. Further, for example, the coaxial wire 1 can be made smaller by setting the outer diameter of the metal wire 31 to 0.03 mm or more and 0.05 mm or less.

図２は、複数の同軸電線を備える多心ケーブルの一例を示す断面図である。
図２に示すように、多心ケーブル５０は、複数（本例では１９本）の同軸電線１と、これらの同軸電線１の周囲を覆うように設けられた押え巻５１とを備えている。また、多心ケーブル５０は、押え巻５１の周囲に設けられたシールド層５２と、シールド層５２の周囲に形成されたケーブル外被５３とを備えている。 FIG. 2 is a cross-sectional view showing an example of a multi-core cable including a plurality of coaxial electric wires.
As shown in FIG. 2, the multi-core cable 50 includes a plurality of (19 in this example) coaxial electric wires 1 and a presser foot 51 provided so as to cover the periphery of these coaxial electric wires 1. Further, the multi-core cable 50 includes a shield layer 52 provided around the presser foot 51 and a cable outer cover 53 formed around the shield layer 52.

同軸電線１は、図１で説明した構成を有しており、例えば１９本の同軸電線１が集められフッ素樹脂などの押え巻５１で束ねられている。なお、１９本の同軸電線１は、一括して撚り合わされていてもよい。 The coaxial electric wire 1 has the configuration described with reference to FIG. 1, for example, 19 coaxial electric wires 1 are collected and bundled with a presser foot 51 made of fluororesin or the like. The 19 coaxial electric wires 1 may be twisted together.

シールド層５２は、例えば外径数十μｍの錫メッキされた銅線などを横巻きしてまたは編組して構成されている。ケーブル外被５３は、例えばポリ塩化ビニル（ＰＶＣ）やポリオレフィン系樹脂等を押出被覆することにより形成されている。 The shield layer 52 is formed by horizontally winding or braiding, for example, a tin-plated copper wire having an outer diameter of several tens of μm. The cable jacket 53 is formed by extruding and coating, for example, polyvinyl chloride (PVC), polyolefin resin, or the like.

このような多心ケーブル５０によれば、多心ケーブル５０を構成する電線として、上述した細径の同軸電線１が用いられており、同軸電線１の外部導体３０を構成する金属素線３１の引張強さが３２０ＭＰａ以上で、破断伸びが１０％以上の銅合金線とされている。このため、耐捻回性、導電性に優れた多心ケーブルとすることができる。 According to such a multi-core cable 50, the above-mentioned small-diameter coaxial electric wire 1 is used as the electric wire constituting the multi-core cable 50, and the metal wire 31 constituting the outer conductor 30 of the coaxial electric wire 1 is used. It is a copper alloy wire having a tensile strength of 320 MPa or more and a breaking elongation of 10% or more. Therefore, a multi-core cable having excellent twist resistance and conductivity can be obtained.

次に、多心ケーブルの捻回試験、および同軸電線の減衰量の評価について説明する。
上述したように中心導体の周囲に、絶縁体、外部導体及び外被を同軸状に順次積層して、表１に示すＮｏ．１〜Ｎｏ．５の構成を満たす同軸電線を用意する。表１に示すＮｏ．１〜Ｎｏ．５の同軸電線では、中心導体および外部導体の構成を変化させている。Ｎｏ．１〜Ｎｏ．５の同軸電線をそれぞれ１９本ずつ用意し、Ｎｏ毎に用意した１９本の同軸電線を備える多心ケーブルを作製する。そして、作製したそれぞれの多心ケーブルについて下記の条件で捻回試験を行った。また、それぞれの同軸電線について下記の条件で減衰量の評価を行った。なお、Ｎｏ．１は実施例１、Ｎｏ．５は実施例２を示し、Ｎｏ．２〜Ｎｏ．４は比較例１〜３を示す。 Next, the twist test of the multi-core cable and the evaluation of the attenuation amount of the coaxial electric wire will be described.
As described above, the insulator, the outer conductor, and the outer cover are sequentially laminated coaxially around the central conductor, and the No. 1 shown in Table 1 is formed. 1-No. Prepare a coaxial electric wire that satisfies the configuration of 5. No. shown in Table 1. 1-No. In the coaxial electric wire of No. 5, the configurations of the central conductor and the outer conductor are changed. No. 1-No. 19 coaxial wires of 5 are prepared for each, and a multi-core cable including 19 coaxial wires prepared for each No. is produced. Then, a twist test was performed on each of the produced multi-core cables under the following conditions. In addition, the attenuation of each coaxial wire was evaluated under the following conditions. In addition, No. 1 is Example 1, No. No. 5 shows Example 2. 2-No. 4 shows Comparative Examples 1 to 3.

Figure 0006939324
Figure 0006939324

表１に示すように、Ｎｏ．１の同軸電線では、中心導体に硬銅線を用いた。また、外部導体を構成する素線に引張強さが３２０ＭＰａで、破断伸びが１４％の銅合金線を用いた。
Ｎｏ．２の同軸電線では、中心導体に銀メッキ軟銅線を用い、外部導体を構成する素線として、引張強さが２５０ＭＰａで、破断伸びが１５％の銀メッキ軟銅線を用いた。
Ｎｏ．３の同軸電線では、中心導体に銀メッキ軟銅線を用い、外部導体を構成する素線として、引張強さが５００ＭＰａで、破断伸びが４％の硬銅線を用いた。
Ｎｏ．４の同軸電線では、中心導体に銀メッキ軟銅線を用い、外部導体を構成する素線として、引張強さが７５０ＭＰａで、破断伸びが３％の銅合金線を用いた。
Ｎｏ．５の同軸電線では、中心導体に銀メッキ銅合金線を用い、外部導体を構成する素線として、引張強さが４５０ＭＰａで、破断伸びが１０％の銅合金線を用いた。
なお、Ｎｏ．１〜Ｎｏ．５の全てにおいて、外部導体の素線の外径は０．０４ｍｍ、中心導体の断面積は０．０５ｍｍ２とした。 As shown in Table 1, No. In the coaxial electric wire of No. 1, a hard copper wire was used as the central conductor. Further, a copper alloy wire having a tensile strength of 320 MPa and a breaking elongation of 14% was used as the wire constituting the outer conductor.
No. In the coaxial electric wire No. 2, a silver-plated annealed copper wire was used as the central conductor, and a silver-plated annealed copper wire having a tensile strength of 250 MPa and a breaking elongation of 15% was used as the strands constituting the outer conductor.
No. In the coaxial electric wire No. 3, a silver-plated annealed copper wire was used as the central conductor, and a hard copper wire having a tensile strength of 500 MPa and a breaking elongation of 4% was used as the strands constituting the outer conductor.
No. In the coaxial electric wire No. 4, a silver-plated annealed copper wire was used as the central conductor, and a copper alloy wire having a tensile strength of 750 MPa and a breaking elongation of 3% was used as the strands constituting the outer conductor.
No. In the coaxial electric wire No. 5, a silver-plated copper alloy wire was used as the central conductor, and a copper alloy wire having a tensile strength of 450 MPa and a breaking elongation of 10% was used as the strands constituting the outer conductor.
In addition, No. 1-No. In all of 5, the outer diameter of the wire of the outer conductor was 0.04 mm, and the cross-sectional area of the center conductor was 0.05 mm 2 .

（捻回試験）
図３に示すように、長さ２ｍの多心ケーブルＣを鉛直に垂れ下がらせて、多心ケーブルＣの上端と下端とをそれぞれチャック６１で把持した。下端のチャック６１を固定させた状態で、上端のチャック６１をケーブルＣの軸Ａ回りに左右へ−３６０°から＋３６０°まで３０回転／分の速度で捻回させた。１万回捻じった後、ケーブルＣを構成する同軸電線の断線の有無を調べ、中心導体および外部導体ともに断線がなければ合格、いずれかに断線があれば不合格とした。 (Twisting test)
As shown in FIG. 3, a multi-core cable C having a length of 2 m was vertically hung down, and the upper end and the lower end of the multi-core cable C were gripped by chucks 61, respectively. With the chuck 61 at the lower end fixed, the chuck 61 at the upper end was twisted left and right around the axis A of the cable C from -360 ° to + 360 ° at a speed of 30 rotations / minute. After twisting 10,000 times, the presence or absence of disconnection of the coaxial electric wire constituting the cable C was examined, and if there was no disconnection in both the center conductor and the outer conductor, it was passed, and if there was any disconnection, it was rejected.

（減衰量の評価）
各多心ケーブルを作製するために用意したＮｏ．１〜Ｎｏ．５の各同軸電線について、高周波帯域（１０ＧＨｚ）の信号を伝送させた際のケーブル長２ｍあたりの減衰量（ｄＢ／２ｍ）を測定した。減衰量が１５ｄＢ／２ｍ以下ならば合格、１５ｄＢ／２ｍよりも大きければ不合格とした。 (Evaluation of attenuation)
No. prepared for manufacturing each multi-core cable. 1-No. For each of the coaxial electric wires of No. 5, the amount of attenuation (dB / 2 m) per cable length of 2 m when a signal in the high frequency band (10 GHz) was transmitted was measured. If the amount of attenuation was 15 dB / 2 m or less, it was passed, and if it was larger than 15 dB / 2 m, it was rejected.

（捻回試験結果）
Ｎｏ．１，Ｎｏ．３〜Ｎｏ．５の各同軸電線によって構成される多心ケーブルでは、捻回試験後において中心導体および外部導体ともに断線が生じなかった。これに対して、Ｎｏ．２の同軸電線によって構成される多心ケーブルでは、捻回試験後において中心導体および外部導体に破断が生じた。これは、Ｎｏ．２の外部導体を構成する銀メッキ軟銅線の引張強さが弱い（２５０ＭＰａ）ためである。これにより、外部導体を構成する素線の引張強さを３２０ＭＰａ以上とすることで、捻回性について優れた耐性を実現できることが確認できた。 (Twisting test result)
No. 1, No. 3 to No. In the multi-core cable composed of each coaxial electric wire of No. 5, neither the central conductor nor the outer conductor was broken after the twisting test. On the other hand, No. In the multi-core cable composed of two coaxial wires, the center conductor and the outer conductor were broken after the twisting test. This is No. This is because the tensile strength of the silver-plated annealed copper wire constituting the outer conductor of No. 2 is weak (250 MPa). As a result, it was confirmed that excellent resistance to twistability can be realized by setting the tensile strength of the strands constituting the outer conductor to 320 MPa or more.

（減衰量の評価結果）
Ｎｏ．１，Ｎｏ．２，Ｎｏ．５の各同軸電線では、減衰量が１５ｄＢ／２ｍ以下となった。これに対して、Ｎｏ．３，Ｎｏ．４の同軸電線では、減衰量が１５ｄＢ／２ｍよりも大きくなった。Ｎｏ．３，Ｎｏ．４の同軸電線で減衰量が大きくなったのは、同軸電線を構成する外部導体の伸びが小さい（素線の破断伸びが３〜４％である）ために、絶縁層の周囲全体に横巻きされていた外部導体の素線が同周囲の一部の領域に偏在してしまったためと考えられる。ボビンに巻き取られた同軸電線に対して巻重ねによる力が加わった時に、外部導体の素線の伸びが小さいために素線が絶縁層の一方に偏在したと考えられる。本発明では、外部導体を構成する素線の破断伸びを１０％以上とすることで、外部導体が絶縁層の一方に偏在せず、同軸電線における減衰量の増加を抑制できることが確認できた。 (Attenuation evaluation result)
No. 1, No. 2, No. In each coaxial electric wire of No. 5, the amount of attenuation was 15 dB / 2 m or less. On the other hand, No. 3, No. In the coaxial electric wire of 4, the amount of attenuation was larger than 15 dB / 2 m. No. 3, No. The reason why the amount of attenuation was large in the coaxial wire of 4 is that the elongation of the outer conductor constituting the coaxial wire is small (the elongation at break of the strand is 3 to 4%), so that it is wound horizontally around the entire circumference of the insulating layer. It is probable that the strands of the outer conductor that had been made were unevenly distributed in a part of the surrounding area. It is probable that when a force due to winding was applied to the coaxial wire wound around the bobbin, the strands of the outer conductor were unevenly distributed on one side of the insulating layer due to the small elongation of the strands. In the present invention, it has been confirmed that by setting the breaking elongation of the strands constituting the outer conductor to 10% or more, the outer conductor is not unevenly distributed on one side of the insulating layer, and an increase in the amount of attenuation in the coaxial electric wire can be suppressed.

以上の結果より、同軸電線の外部導体を構成する素線として銅合金線を使用し、その銅合金線の引張強さを３２０ＭＰａ以上、かつ破断伸びを１０％以上とすることで、細径であっても優れた耐捻回性と導電性とを得られることが確認できた。 Based on the above results, a copper alloy wire is used as the wire that constitutes the outer conductor of the coaxial electric wire, and the tensile strength of the copper alloy wire is 320 MPa or more and the breaking elongation is 10% or more, so that the diameter can be reduced. It was confirmed that excellent twist resistance and conductivity can be obtained even if there is.

以上、本発明を詳細にまた特定の実施態様を参照して説明したが、本発明の精神と範囲を逸脱することなく様々な変更や修正を加えることができることは当業者にとって明らかである。また、上記説明した構成部材の数、位置、形状等は上記実施の形態に限定されず、本発明を実施する上で好適な数、位置、形状等に変更することができる。 Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. Further, the number, position, shape, etc. of the constituent members described above are not limited to the above-described embodiment, and can be changed to a number, position, shape, etc. suitable for carrying out the present invention.

１：同軸電線
１０：中心導体
２０：絶縁層
３０：外部導体
３１：金属素線（素線）
４０：外被
５０：多心ケーブル
５１：押え巻
５２：シールド層
５３：ケーブル外被 1: Coaxial wire 10: Center conductor 20: Insulation layer 30: Outer conductor 31: Metal wire (wire)
40: Outer cover 50: Multi-core cable 51: Presser winding 52: Shield layer 53: Cable outer cover

Claims (3)

中心導体の周囲に、絶縁層、外部導体及び外被が同軸状に順次積層された同軸電線であって、
前記外部導体は複数の素線で構成されており、 前記素線は、引張強さが３２０ＭＰａ以上、かつ破断伸びが１０％以上の銅合金線であり、
前記中心導体は、０．０１ｍｍ ２ 以上０．０５ｍｍ ２ 以下の断面積を有し、

前記素線の外径が０．０３ｍｍ以上０．０５ｍｍ以下である、同軸電線。 A coaxial electric wire in which an insulating layer, an outer conductor, and a jacket are sequentially laminated coaxially around the central conductor.
The outer conductor is composed of a plurality of strands, said strands, a tensile strength of 320MPa or more, and Ri copper alloy wire der breaking elongation 10% or more,
It said center conductor has a cross-sectional area of 0.01 mm 2 or more 0.05 mm 2 or less,

A coaxial electric wire having an outer diameter of 0.03 mm or more and 0.05 mm or less. 前記中心導体は、複数の硬銅線で構成される、請求項１に記載の同軸電線。 The coaxial electric wire according to claim 1, wherein the central conductor is composed of a plurality of hard copper wires. 請求項１または２に記載の同軸電線を複数本と、
前記複数本の同軸電線を樹脂によって押出被覆したケーブル外被と、を備える多心ケーブルであって、
前記複数本の同軸電線は、前記多心ケーブルの中央に配置される中心同軸電線、前記中心同軸電線の周囲に配置される内側同軸電線、および、前記内側同軸電線の周囲に配置される最外同軸電線を備え、
前記中心同軸電線、前記内側同軸電線、および、前記最外同軸電線は等しい外径を有し、
それぞれ１本の前記内側同軸電線に対して、それぞれ互いに接する２本の前記最外同軸電線が接するように一括して撚り合わされている、多心ケーブル。 A plurality of coaxial electric wires according to claim 1 or 2,
A multi-core cable including a cable jacket in which the plurality of coaxial electric wires are extruded and coated with a resin .
The plurality of coaxial electric wires are the central coaxial electric wire arranged in the center of the multi-core cable, the inner coaxial electric wire arranged around the central coaxial electric wire, and the outermost electric wire arranged around the inner coaxial electric wire. Equipped with coaxial wire,
The central coaxial wire, the inner coaxial wire, and the outermost coaxial wire have equal outer diameters.
A multi-core cable in which two outermost coaxial electric wires, which are in contact with each other, are collectively twisted so as to be in contact with each one of the inner coaxial electric wires .
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