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JP2015018669A - Coaxial cable for high frequency signal transmission - Google Patents

Coaxial cable for high frequency signal transmission Download PDF

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Publication number
JP2015018669A
JP2015018669A JP2013144748A JP2013144748A JP2015018669A JP 2015018669 A JP2015018669 A JP 2015018669A JP 2013144748 A JP2013144748 A JP 2013144748A JP 2013144748 A JP2013144748 A JP 2013144748A JP 2015018669 A JP2015018669 A JP 2015018669A
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layer
frequency signal
coaxial cable
light shielding
signal transmission
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JP5974992B2 (en
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得天 黄
Tokuten Ko
得天 黄
考信 渡部
Takanobu Watabe
考信 渡部
紀美香 工藤
Kimika Kudo
紀美香 工藤
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Proterial Ltd
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Hitachi Metals Ltd
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Priority to KR1020140061343A priority patent/KR102189898B1/en
Priority to CN201410306711.1A priority patent/CN104282392B/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H01B7/0208—Cables with several layers of insulating material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/1875—Multi-layer sheaths

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Communication Cables (AREA)
  • Manufacturing Of Electric Cables (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a coaxial cable for high frequency signal transmission capable of preventing the damage of an internal conductor caused by laser light upon terminal treatment without incorporating a coloring agent into an insulation layer.SOLUTION: Provided is a coaxial cable 100 for high frequency signal transmission provided with: a conductor 101; an insulation layer 102 formed around the conductor 101; a light shielding layer 103 formed around the insulation layer 102; a shield layer 105 formed in such a manner that an element wire 104 is horizontally wound around the light shielding layer 103; and a covering layer 106 formed around the shield layer, in which the shield layer 105 is adhesively fixed to the light shielding layer 103.

Description

本発明は、高周波信号の伝送に好適な高周波信号伝送用同軸ケーブルに関する。   The present invention relates to a high-frequency signal transmission coaxial cable suitable for high-frequency signal transmission.

従来技術に係る同軸ケーブルは、外部導体を構成するシールド層が素線を編み込んで形成された編組シールドからなる。この編組シールドでは、素線が交差するようにして網目状に編み込まれていることから、端末処理の際に素線がばらけ難く、端末接続部分でのインピーダンスの変化を抑制することができ、また端末接続部分でのノイズ特性の劣化を抑制することができる。   The coaxial cable according to the prior art is composed of a braided shield in which a shield layer constituting an outer conductor is formed by braiding strands. In this braided shield, since the strands are knitted in a mesh shape so that the strands intersect, it is difficult for the strands to be scattered during terminal processing, and the change in impedance at the terminal connection portion can be suppressed. In addition, it is possible to suppress the deterioration of noise characteristics at the terminal connection portion.

しかし、編組シールドでは、構造上どうしてもシールド層の厚さが素線径の２倍以上となり、同軸ケーブルの細径化を目指す際に障害となっている。また、シールド層の表面に網目状の隙間が点在するので、例えば、１ＧＨｚ以上の高周波信号を伝送する際の減衰特性が劣化するという課題があった。   However, in the braided shield, the thickness of the shield layer is inevitably more than twice the strand diameter due to the structure, which is an obstacle when aiming to reduce the diameter of the coaxial cable. Further, since the mesh-like gaps are scattered on the surface of the shield layer, there has been a problem that the attenuation characteristic at the time of transmitting a high frequency signal of 1 GHz or more is deteriorated, for example.

これに対して、シールド層が素線を横巻きして形成された横巻きシールドからなる同軸ケーブルでは、シールド層の厚さが素線径と同一となり、また素線が隙間を生じないように巻き付けられているので、同軸ケーブルの細径化を図り、且つ高周波信号に対する減衰特性の劣化を抑制するという観点からは好都合である。   On the other hand, in a coaxial cable composed of a horizontal shield formed by horizontally winding a shield layer, the thickness of the shield layer is the same as the strand diameter, and the strand does not cause a gap. Since it is wound, it is advantageous from the viewpoint of reducing the diameter of the coaxial cable and suppressing the deterioration of the attenuation characteristic with respect to the high-frequency signal.

ところが、横巻きシールドは、端末処理の際にばらけ易く、隣接する素線同士の間隔が開いてしまうため、端末接続部分でのインピーダンスが変化して所望のインピーダンス特性が得られず、また端末接続部分でのノイズ特性が劣化してしまうという課題を抱えている。   However, horizontal winding shields are easily scattered during terminal processing, and the spacing between adjacent strands is increased, so that the impedance at the terminal connection portion changes and desired impedance characteristics cannot be obtained. There is a problem that the noise characteristics at the connection part deteriorate.

この課題を解決するために、絶縁層とシールド層との間に接着層を介在させることで、素線を一体化した同軸ケーブルが提案されている（例えば、特許文献１又は２参照）。   In order to solve this problem, a coaxial cable in which strands are integrated by interposing an adhesive layer between an insulating layer and a shield layer has been proposed (for example, see Patent Document 1 or 2).

この同軸ケーブルによれば、素線が一体化されているので端末処理の際にばらけ難く、端末接続部分でのインピーダンスの変化が少なく所望のインピーダンス特性が得られ、また端末接続部分でのノイズ特性が劣化することは無い。   According to this coaxial cable, since the strands are integrated, it is difficult to separate during terminal processing, there is little change in impedance at the terminal connection part, and a desired impedance characteristic can be obtained, and noise at the terminal connection part is obtained. The characteristics are not deteriorated.

特開平８−１３８４５７号公報JP-A-8-138457 特開昭５４−５５９１号公報JP-A-54-5591

ところで、近年は端末処理の高速化が要求されていることから、一度に多数の同軸ケーブルの端末処理を行うことができるように、ＹＡＧレーザ等のレーザ光を使用することにより、多数の同軸ケーブルの素線を一括して切断する方法の採用が望まれている。   By the way, in recent years, since high-speed terminal processing is required, a large number of coaxial cables can be used by using a laser beam such as a YAG laser so that the terminal processing of a large number of coaxial cables can be performed at a time. It is desired to adopt a method of cutting the strands of the lump together.

一般的に絶縁層を形成する樹脂は、高純度な状態でレーザ光に対して透明であることが多いことから、端末処理の方法として前述した方法を採用する場合には、シールド層の僅かな隙間から漏れたレーザ光が絶縁層を透過して内部導体にまで到達することにより内部導体が損傷して断線に至ることを防止するため、レーザ光を吸収して遮断する働きを持つ着色剤を絶縁層に含有させることが必要となる。   In general, the resin that forms the insulating layer is often transparent to laser light in a high-purity state. In order to prevent the laser light leaking from the gap from passing through the insulating layer and reaching the internal conductor, the internal conductor is damaged and disconnected, a coloring agent that absorbs and blocks the laser light is used. It is necessary to make it contain in an insulating layer.

しかしながら、着色剤は絶縁層とは異なる物質であり、また着色剤を絶縁層中に完全に均一に分散させることは技術的に困難であるので、その不均一な着色剤の分散により、絶縁層の誘電率がケーブル長手方向でばらついてしまう。   However, since the colorant is a different material from the insulating layer, and it is technically difficult to disperse the colorant completely and uniformly in the insulating layer, the nonuniform distribution of the colorant causes the insulating layer to disperse. The dielectric constant varies in the longitudinal direction of the cable.

絶縁層の誘電率がケーブル長手方向でばらつくと、高周波信号を伝送する際の減衰特性が劣化することから、高周波信号の伝送に使用される同軸ケーブルでは着色剤を絶縁層に含有させることはできない。   If the dielectric constant of the insulating layer varies in the longitudinal direction of the cable, the attenuation characteristics at the time of transmitting a high-frequency signal deteriorate, so the coaxial cable used for transmitting a high-frequency signal cannot contain a colorant in the insulating layer. .

そこで、本発明の目的は、着色剤を絶縁層に含有させること無く、端末処理の際のレーザ光による内部導体の損傷を防止することが可能な高周波信号伝送用同軸ケーブルを提供することにある。   Accordingly, an object of the present invention is to provide a coaxial cable for high-frequency signal transmission that can prevent damage to an internal conductor due to laser light during terminal processing without containing a colorant in an insulating layer. .

この目的を達成するために創案された本発明は、導体と、前記導体の周囲に形成された絶縁層と、前記絶縁層の周囲に形成された遮光層と、前記遮光層の周囲に素線を横巻きして形成されたシールド層と、前記シールド層の周囲に形成された被覆層と、を備え、前記シールド層は、前記遮光層に接着固定されている高周波信号伝送用同軸ケーブルである。   The present invention created to achieve this object includes a conductor, an insulating layer formed around the conductor, a light shielding layer formed around the insulating layer, and an element wire around the light shielding layer. And a covering layer formed around the shield layer, wherein the shield layer is a coaxial cable for high-frequency signal transmission that is adhesively fixed to the light shielding layer. .

前記遮光層は、レーザ光に対して不透明な金属層と、前記金属層の周囲に形成された接着層と、を備えていると良い。   The light shielding layer may include a metal layer opaque to laser light and an adhesive layer formed around the metal layer.

前記遮光層は、レーザ光に対して不透明な樹脂層と、前記樹脂層の周囲に形成された接着層と、を備えていても良い。   The light shielding layer may include a resin layer that is opaque to laser light and an adhesive layer formed around the resin layer.

前記遮光層は、レーザ光に対して不透明な導電性接着層を備えていても良い。   The light shielding layer may include a conductive adhesive layer that is opaque to laser light.

前記遮光層は、前記接着層又は前記導電性接着層よりも内側に基材となる介在層を更に備え、前記接着層又は前記導電性接着層は、前記介在層よりも低い融点を有していると良い。   The light shielding layer further includes an intervening layer serving as a base material inside the adhesive layer or the conductive adhesive layer, and the adhesive layer or the conductive adhesive layer has a lower melting point than the intervening layer. Good to be.

前記遮光層は、テープを前記絶縁層の周囲にラップ巻きして形成されていると良い。   The light shielding layer may be formed by wrapping a tape around the insulating layer.

本発明によれば、着色剤を絶縁層に含有させること無く、端末処理の際のレーザ光による内部導体の損傷を防止することが可能な高周波信号伝送用同軸ケーブルを提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the coaxial cable for high frequency signal transmission which can prevent the damage of an internal conductor by the laser beam in the case of a terminal process without containing a coloring agent in an insulating layer can be provided.

本発明の一実施の形態に係る高周波信号伝送用同軸ケーブルを示す断面図である。It is sectional drawing which shows the coaxial cable for high frequency signal transmission which concerns on one embodiment of this invention. 本発明の一実施の形態に係る高周波信号伝送用同軸ケーブルを示す断面図である。It is sectional drawing which shows the coaxial cable for high frequency signal transmission which concerns on one embodiment of this invention. 金属層又は樹脂層と接着層とを備えるテープを示す断面図である。It is sectional drawing which shows a tape provided with a metal layer or a resin layer, and an contact bonding layer. 介在層を更に備えるテープを示す断面図である。It is sectional drawing which shows the tape further provided with an intervening layer.

以下、本発明の好適な実施の形態を添付図面にしたがって説明する。   Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

図１及び図２に示すように、本実施の形態に係る高周波信号伝送用同軸ケーブル１００は、導体１０１と、導体１０１の周囲に形成された絶縁層１０２と、絶縁層１０２の周囲に形成された遮光層１０３と、遮光層１０３の周囲に素線１０４を横巻きして形成されたシールド層１０５と、シールド層１０５の周囲に形成された被覆層１０６と、を備え、シールド層１０５は、遮光層１０３に接着固定されていることを特徴とする。   As shown in FIGS. 1 and 2, the high-frequency signal transmission coaxial cable 100 according to the present embodiment is formed around a conductor 101, an insulating layer 102 formed around the conductor 101, and an insulating layer 102. A light shielding layer 103, a shield layer 105 formed by horizontally winding a strand 104 around the light shielding layer 103, and a covering layer 106 formed around the shield layer 105. The light-shielding layer 103 is adhesively fixed.

この高周波信号伝送用同軸ケーブル１００では、内部導体が導体１０１で構成されており、外部導体がシールド層１０５で構成されている。   In this high-frequency signal transmission coaxial cable 100, the inner conductor is constituted by a conductor 101 and the outer conductor is constituted by a shield layer 105.

導体１０１は、導電性に優れた金属（例えば、銅やアルミニウム）からなる単線又は撚線（図１及び図２では撚線）で構成されている。高周波信号伝送用同軸ケーブル１００が高周波信号の伝送に使用されることを考慮すると、表皮効果の影響を低減することを目的として、表面積の多い撚線を採用することが好ましい。これらの単線又は撚線は、めっき処理が施されためっき線であっても構わない。めっき線としては、例えば、錫めっき線又は銀めっき線を使用することができる。   The conductor 101 is composed of a single wire or a twisted wire (twisted wire in FIGS. 1 and 2) made of a metal having excellent conductivity (for example, copper or aluminum). Considering that the coaxial cable 100 for high-frequency signal transmission is used for high-frequency signal transmission, it is preferable to employ a stranded wire with a large surface area for the purpose of reducing the influence of the skin effect. These single wires or stranded wires may be plated wires that have been plated. As the plating wire, for example, a tin plating wire or a silver plating wire can be used.

絶縁層１０２は、高周波信号の伝送に対応するために低誘電率樹脂からなる。低誘電率樹脂としては、誘電率がケーブル長手方向でばらつくことを防止するために、不可避的なものを除いて着色剤等の不純物が含有されていない高純度なものが使用される。また、低誘電率樹脂としては、端末処理の際に絶縁層１０２を容易に露出させることができるように、後述する接着層１０８や導電性接着層１０９と接着し難いフッ素樹脂（例えば、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（ＰＦＡ）や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（ＦＥＰ））を使用することが好ましい。   The insulating layer 102 is made of a low dielectric constant resin in order to cope with transmission of a high frequency signal. As the low dielectric constant resin, in order to prevent the dielectric constant from varying in the longitudinal direction of the cable, a high-purity resin that does not contain impurities such as a colorant is used except for inevitable ones. In addition, as the low dielectric constant resin, a fluororesin (for example, tetrafluoroethylene) that is difficult to adhere to an adhesive layer 108 and a conductive adhesive layer 109 described later can be easily exposed so that the insulating layer 102 can be easily exposed during terminal processing. It is preferable to use an ethylene / perfluoroalkyl vinyl ether copolymer (PFA) or a tetrafluoroethylene / hexafluoropropylene copolymer (FEP)).

遮光層１０３は、レーザ光に対して不透明な金属層又は樹脂層１０７と、金属層又は樹脂層１０７の周囲に形成された接着層１０８と、を備えている（図１参照）。特に、金属層を採用した場合には、シールド層１０５を基板の端子等に半田接続する際に流れ込んだ半田がシールド層１０５及び金属層に接触して導通するため、ノイズ特性を更に向上させることが可能となる。金属層は、例えば、０．１μｍ以上３μｍ以下程度の厚さを有する銅被膜やアルミニウム被膜からなる。樹脂層は、例えば、カーボン粒子、チタン粒子、又は酸化チタン粒子等を主原料とした着色剤を含有する樹脂からなる。接着層１０８としては、例えば、ポリアミド系樹脂からなるホットメルト接着剤を使用することができる。   The light shielding layer 103 includes a metal layer or resin layer 107 that is opaque to laser light, and an adhesive layer 108 formed around the metal layer or resin layer 107 (see FIG. 1). In particular, when a metal layer is employed, since the solder that flows when the shield layer 105 is solder-connected to the terminals of the substrate contacts the shield layer 105 and the metal layer and conducts, the noise characteristics are further improved. Is possible. The metal layer is made of, for example, a copper film or an aluminum film having a thickness of about 0.1 μm or more and 3 μm or less. The resin layer is made of, for example, a resin containing a colorant whose main material is carbon particles, titanium particles, or titanium oxide particles. As the adhesive layer 108, for example, a hot melt adhesive made of a polyamide resin can be used.

また、遮光層１０３は、金属層又は樹脂層１０７と接着層１０８とに代えて、レーザ光に対して不透明な導電性接着層１０９を備えていても構わない（図２参照）。導電性接着層１０９を採用した場合には、導電性接着層１０９が接着層１０８の機能も兼ねるため、別途の接着層１０８は不要となる。導電性接着層１０９は、カーボンブラック等の導電性粒子を含有する接着剤からなる。   In addition, the light shielding layer 103 may include a conductive adhesive layer 109 that is opaque to laser light, instead of the metal layer or resin layer 107 and the adhesive layer 108 (see FIG. 2). In the case where the conductive adhesive layer 109 is used, the conductive adhesive layer 109 also functions as the adhesive layer 108, so that the separate adhesive layer 108 is not necessary. The conductive adhesive layer 109 is made of an adhesive containing conductive particles such as carbon black.

なお、遮光層１０３は、端末処理の際にレーザ光が導体１０１に到達しないように、レーザ光を吸収（又は反射）して遮光するための機能を発揮するものであれば、具体的な構成は特に限定されるものではない。遮光層１０３の厚さは、高周波信号伝送用同軸ケーブル１００の可撓特性や屈曲特性を考慮して、レーザ光を遮光できる最低限の厚さであれば良い。   The light shielding layer 103 has a specific configuration as long as it exhibits a function for absorbing (or reflecting) and shielding the laser light so that the laser light does not reach the conductor 101 during terminal processing. Is not particularly limited. The thickness of the light shielding layer 103 may be a minimum thickness that can shield the laser light in consideration of the flexibility characteristics and bending characteristics of the coaxial cable 100 for high frequency signal transmission.

また、遮光層１０３は、接着層１０８又は導電性接着層１０９よりも内側に基材となる介在層を更に備え、接着層１０８又は導電性接着層１０９は、介在層よりも低い融点を有していても構わない。この介在層については後述する。   The light shielding layer 103 further includes an intervening layer serving as a base material inside the adhesive layer 108 or the conductive adhesive layer 109, and the adhesive layer 108 or the conductive adhesive layer 109 has a melting point lower than that of the intervening layer. It does not matter. This intervening layer will be described later.

遮光層１０３は、例えば、図３に示すように、テープ３００を絶縁層１０２の周囲にラップ巻きして形成されている。テープ３００は、金属層又は樹脂層１０７と接着層１０８とを備えるか、又は導電性接着層１０９を備えており、接着層１０８又は導電性接着層１０９がシールド層１０５に接触するように接着層１０８又は導電性接着層１０９を外側にしてラップ巻きされている。   For example, as shown in FIG. 3, the light shielding layer 103 is formed by wrapping a tape 300 around the insulating layer 102. The tape 300 includes a metal layer or resin layer 107 and an adhesive layer 108, or includes a conductive adhesive layer 109, and the adhesive layer 108 or the conductive adhesive layer 109 is in contact with the shield layer 105. 108 or conductive adhesive layer 109 is wrapped outside.

また、遮光層１０３は、図４に示すように、接着層１０８又は導電性接着層１０９よりも内側に基材となる介在層４０１を更に備えたテープ４００を絶縁層１０２の周囲にラップ巻きして形成されていても構わない。これにより、テープ４００を補強することができ、巻き付け時にテープ４００が破断等することを防止することが可能となる。   As shown in FIG. 4, the light shielding layer 103 is wrapped around a tape 400 further provided with an intervening layer 401 as a base material inside the adhesive layer 108 or the conductive adhesive layer 109 around the insulating layer 102. It may be formed. As a result, the tape 400 can be reinforced, and the tape 400 can be prevented from being broken during winding.

介在層４０１は、４μｍ以上６μｍ以下の厚さを有していることが好ましい。これにより、テープ４００を十分に補強しながら、高周波信号伝送用同軸ケーブル１００の外径が大きくなることを防止することが可能となる。なお、介在層４０１の材料としては、ポリエチレンテレフタレート（ＰＥＴ）が挙げられる。   The intervening layer 401 preferably has a thickness of 4 μm or more and 6 μm or less. As a result, it is possible to prevent the outer diameter of the high-frequency signal transmission coaxial cable 100 from increasing while the tape 400 is sufficiently reinforced. In addition, as a material of the intervening layer 401, a polyethylene terephthalate (PET) is mentioned.

素線１０４は、導電性に優れた金属（例えば、銅やアルミニウム）からなると共にめっき処理が施されためっき線で構成されており、隣接する素線１０４同士が隙間を生じないように接着層１０８の周囲に横巻きされて横巻シールドとされている。めっき線としては、例えば、錫めっき線又は銀めっき線を使用することができる。   The strand 104 is made of a plated wire made of a metal having excellent conductivity (for example, copper or aluminum) and plated, and an adhesive layer is formed so that the adjacent strands 104 do not form a gap. A laterally wound shield is formed by laterally winding around 108. As the plating wire, for example, a tin plating wire or a silver plating wire can be used.

接着層１０８の周囲に素線１０４が横巻きされた時点では、接着層１０８又は導電性接着層１０９は溶融しておらず、シールド層１０５は固定されていないが、シールド層１０５の周囲に被覆層１０６を形成する際の押出成型熱により接着層１０８又は導電性接着層１０９が溶融し、シールド層１０５が固定される。このとき、図１及び図２の左下に拡大して示すように、溶融した接着層１０８又は導電性接着層１０９を素線１０４の周囲に回り込ませて素線１０４を一体化しても良い。   When the wire 104 is wound horizontally around the adhesive layer 108, the adhesive layer 108 or the conductive adhesive layer 109 is not melted and the shield layer 105 is not fixed, but the shield layer 105 is covered. The adhesive layer 108 or the conductive adhesive layer 109 is melted by the extrusion molding heat when forming the layer 106, and the shield layer 105 is fixed. At this time, as shown in an enlarged view in the lower left of FIGS. 1 and 2, the melted adhesive layer 108 or the conductive adhesive layer 109 may be wrapped around the strand 104 to integrate the strand 104.

なお、素線１０４が錫めっき線からなる場合には、めっき層を保護するために表面に流動パラフィンが塗布されていることが多く、この流動パラフィンが接着層１０８又は導電性接着層１０９との接着を若干阻害するため、素線１０４が銀めっき線からなる場合と比較してシールド層１０５の除去がより容易になるという利点がある。   When the wire 104 is made of a tin-plated wire, liquid paraffin is often applied to the surface in order to protect the plating layer, and this liquid paraffin is bonded to the adhesive layer 108 or the conductive adhesive layer 109. Since the adhesion is slightly inhibited, there is an advantage that the shield layer 105 can be easily removed as compared with the case where the wire 104 is made of a silver-plated wire.

被覆層１０６は、フッ素樹脂からなり、３３０℃以上３６０℃以下の押出成型熱で押出被覆されて形成される。押出成型熱が３３０℃以上３６０℃以下と介在層４０１の融点よりも高いが、押出被覆後に直ちに冷却されるため、その押出成型熱で介在層４０１が溶融することは無い。   The coating layer 106 is made of a fluororesin, and is formed by extrusion coating with extrusion molding heat of 330 ° C. or higher and 360 ° C. or lower. Although the heat of extrusion molding is 330 ° C. or higher and 360 ° C. or lower, which is higher than the melting point of the intervening layer 401, the intervening layer 401 is not melted by the extruding heat because it is cooled immediately after extrusion coating.

これまで説明してきた高周波信号伝送用同軸ケーブル１００によれば、絶縁層１０２とシールド層１０５との間にレーザ光を遮光するための遮光層１０３が形成されているため、着色剤を絶縁層１０２に含有させること無く、端末処理の際のレーザ光による導体１０１の損傷を防止することが可能である。   According to the high-frequency signal transmission coaxial cable 100 described so far, since the light shielding layer 103 for shielding laser light is formed between the insulating layer 102 and the shield layer 105, the colorant is added to the insulating layer 102. Without being contained in the conductor 101, it is possible to prevent the conductor 101 from being damaged by the laser light during the terminal processing.

また、高周波信号伝送用同軸ケーブル１００では、シールド層１０５が接着層１０８又は導電性接着層１０９により固定されているため、端末処理の際に素線１０４がばらけ難く、優れた端末処理性を実現することができる。そのため、隣接する素線１０４同士の間隔が開き難く、端末接続部分での電気特性が良好となる。   In addition, in the coaxial cable 100 for high-frequency signal transmission, since the shield layer 105 is fixed by the adhesive layer 108 or the conductive adhesive layer 109, the wire 104 is difficult to be separated at the time of terminal processing, and excellent terminal processing performance is achieved. Can be realized. Therefore, it is difficult to open the interval between adjacent strands 104, and electrical characteristics at the terminal connection portion are improved.

１００ 高周波信号伝送用同軸ケーブル
１０１ 導体
１０２ 絶縁層
１０３ 遮光層
１０４ 素線
１０５ シールド層
１０６ 被覆層
１０７ 金属層又は樹脂層
１０８ 接着層
１０９ 導電性接着層
３００ テープ
４００ テープ
４０１ 介在層 DESCRIPTION OF SYMBOLS 100 Coaxial cable for high frequency signal transmission 101 Conductor 102 Insulating layer 103 Light shielding layer 104 Wire 105 Shielding layer 106 Covering layer 107 Metal layer or resin layer 108 Adhesive layer 109 Conductive adhesive layer 300 Tape 400 Tape 401 Interposition layer

Claims (6)

導体と、
前記導体の周囲に形成された絶縁層と、
前記絶縁層の周囲に形成された遮光層と、
前記遮光層の周囲に素線を横巻きして形成されたシールド層と、
前記シールド層の周囲に形成された被覆層と、
を備え、
前記シールド層は、前記遮光層に接着固定されていることを特徴とする高周波信号伝送用同軸ケーブル。 Conductors,
An insulating layer formed around the conductor;
A light shielding layer formed around the insulating layer;
A shield layer formed by horizontally winding an element wire around the light shielding layer;
A coating layer formed around the shield layer;
With
The coaxial cable for high-frequency signal transmission, wherein the shield layer is bonded and fixed to the light shielding layer. 前記遮光層は、
レーザ光に対して不透明な金属層と、
前記金属層の周囲に形成された接着層と、
を備えている請求項１に記載の高周波信号伝送用同軸ケーブル。 The light shielding layer is
A metal layer opaque to the laser beam;
An adhesive layer formed around the metal layer;
The coaxial cable for high-frequency signal transmission according to claim 1, comprising: 前記遮光層は、
レーザ光に対して不透明な樹脂層と、
前記樹脂層の周囲に形成された接着層と、
を備えている請求項１に記載の高周波信号伝送用同軸ケーブル。 The light shielding layer is
A resin layer opaque to the laser beam;
An adhesive layer formed around the resin layer;
The coaxial cable for high-frequency signal transmission according to claim 1, comprising: 前記遮光層は、レーザ光に対して不透明な導電性接着層を備えている請求項１に記載の高周波信号伝送用同軸ケーブル。   The coaxial cable for high-frequency signal transmission according to claim 1, wherein the light shielding layer includes a conductive adhesive layer that is opaque to laser light. 前記遮光層は、前記接着層又は前記導電性接着層よりも内側に基材となる介在層を更に備え、
前記接着層又は前記導電性接着層は、前記介在層よりも低い融点を有している請求項２から４の何れか一項に記載の高周波信号伝送用同軸ケーブル。 The light shielding layer further comprises an intervening layer serving as a base material inside the adhesive layer or the conductive adhesive layer,
The coaxial cable for high-frequency signal transmission according to any one of claims 2 to 4, wherein the adhesive layer or the conductive adhesive layer has a lower melting point than the intervening layer. 前記遮光層は、テープを前記絶縁層の周囲にラップ巻きして形成されている請求項１から５の何れか一項に記載の高周波信号伝送用同軸ケーブル。   The coaxial cable for high-frequency signal transmission according to any one of claims 1 to 5, wherein the light shielding layer is formed by wrapping a tape around the insulating layer.
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