JP2008027914A - Superfine coaxial cable - Google Patents

Superfine coaxial cable Download PDF

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Publication number
JP2008027914A
JP2008027914A JP2007188675A JP2007188675A JP2008027914A JP 2008027914 A JP2008027914 A JP 2008027914A JP 2007188675 A JP2007188675 A JP 2007188675A JP 2007188675 A JP2007188675 A JP 2007188675A JP 2008027914 A JP2008027914 A JP 2008027914A
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coaxial cable
insulating layer
inner conductor
shield layer
ultrafine
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Inventor
Chan-Yong Park
パク、チャン−ヨン
Gi-Joon Nam
ナム、ギ−ジュン
Jung-Won Park
パク、ジョン−ウォン
In-Ha Kim
キム、イン−ハ
June-Sun Kim
キム、ジュン−ソン
Hyun Suk Kim
キム、ヒョン−ソク
Il-Gun Seo
ソ、イル−ゴン
Gun-Joo Lee
リー、ゴン−ジュ
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LS Cable and Systems Ltd
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LS Cable Ltd
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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
    • H01B11/12—Arrangements for exhibiting specific transmission characteristics
    • 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
    • H01B11/1808—Construction of the conductors
    • H01B11/1813—Co-axial cables with at least one braided 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
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1834—Construction of the insulation between the conductors
    • 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
    • H01B11/1869—Construction of the layers on the outer side of the 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
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1895—Particular features or applications
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/016—Apparatus or processes specially adapted for manufacturing conductors or cables for manufacturing co-axial cables

Abstract

<P>PROBLEM TO BE SOLVED: To provide a superfine coaxial cable which has excellent impedance characteristics and can stably transmit signals without a reflection loss even in a high-frequency transmission and moreover can transmit a high-quality image by remarkably controlling an external interference of signals in a high-frequency transmission. <P>SOLUTION: The superfine coaxial cable is provided with an internal conductor in which a plurality of first superfine metallic wires are twisted at a pitch of 0.5 to 3 mm, an insulating layer composed of a polymer material of a dielectric constant of 1.2 to 2.0, a metallic shielding layer which surrounds the insulating layer and of which a plurality of the second superfine metallic wires surround horizontally the insulating layer at a horizontal winding pitch of 2.0 to 10.0mm, and a protecting cover layer formed to surround the metallic shielding layer. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本件発明は、極細同軸ケーブルに関する。さらに詳しくは、優れたインピーダンス特性を有し、高周波伝送の際にも反射損失なく安定的な信号伝送が可能であり、また、高周波伝送の際に信号の外部干渉を著しく抑制して、高画質の伝送が可能な極細同軸ケーブルに関する。   The present invention relates to a micro coaxial cable. More specifically, it has excellent impedance characteristics, enables stable signal transmission without reflection loss even during high-frequency transmission, and significantly suppresses external signal interference during high-frequency transmission, resulting in high image quality. The present invention relates to an ultrafine coaxial cable capable of transmitting data.

同軸ケーブルは信号を伝送するための内部導体と、内部導体の同軸上に外部導体（金属シールド層）が形成された構造のケーブルであって、大きさ別／種類別に数多くの製品が開発されている。そして、主に建物の地下のアンテナ又はＣＡＴＶなどに信号を伝送するためのケーブルとして用いられてきた。従来の同軸ケーブルに関する主な開発テーマは、エネルギーの損失を減らすための内部導体と外部導体との間の構造設計、誘電特性の改善及び外部導体に対する種々の機能の付与などであった。   A coaxial cable is a cable with a structure in which an inner conductor for transmitting signals and an outer conductor (metal shield layer) are formed on the same axis as the inner conductor. Many products have been developed by size and type. Yes. And it has been mainly used as a cable for transmitting a signal to an antenna in the basement of a building or a CATV. The main development themes regarding the conventional coaxial cable were the structural design between the inner conductor and the outer conductor to reduce energy loss, the improvement of dielectric characteristics, and the addition of various functions to the outer conductor.

そして、高度情報化社会への進展に伴い、情報通信機器及びその機器に搭載される半導体素子の試験装置及び検査装置などでは、伝送速度の高速化への対応要請が高まっている。   With the advancement to a highly information-oriented society, there is an increasing demand for higher transmission speeds in information communication devices and semiconductor device testing devices and inspection devices mounted on such devices.

一方、ポータブルマルチメディア機器、そして内視鏡などの医療機器の小型化が進み、これらの駆動に用いる直径１ｍｍ以下の極細同軸ケーブルの、性能向上のための研究が活発に行われている。   On the other hand, miniaturization of portable multimedia devices and medical devices such as endoscopes is progressing, and research for improving the performance of ultra-fine coaxial cables having a diameter of 1 mm or less used for driving these devices is actively conducted.

このような同軸ケーブルは、一般に、内部導体、絶縁層、金属シールド層及び保護被覆層で構成される。そして、同軸ケーブルの伝送特性は、以下の数１を用いて計算される特性インピーダンス（Ｃｈａｒａｃｔｅｒｉｓｔｉｃ Ｉｍｐｅｄａｎｃｅ， Ｚ０）によって決まる。同軸ケーブルの伝送特性においては、インピーダンス整合（Ｉｍｐｅｄａｎｃｅ Ｍａｔｃｈｉｎｇ）が最も重要な要素である。そして、エネルギー波の電力伝送特性が最も良いインピーダンスは３３オーム（Ω）、信号波形の歪み（ｄｉｓｔｏｒｔｉｏｎ）特性が最も良いインピーダンスは７５オームであり、国際標準値はそのほぼ中央値である４５〜５０オームである。 Such a coaxial cable is generally composed of an inner conductor, an insulating layer, a metal shield layer, and a protective coating layer. The transmission characteristic of the coaxial cable is determined by a characteristic impedance (Characteristic Impedance, Z 0 ) calculated using the following equation ( 1 ). Impedance matching is the most important factor in the transmission characteristics of a coaxial cable. The impedance with the best power transmission characteristic of the energy wave is 33 ohms (Ω), the impedance with the best distortion characteristic of the signal waveform is 75 ohms, and the international standard value is approximately the median value of 45-50. Ohm.

上記の数式から分かるように、特性インピーダンスは「内部導体の直径」と「金属シールド層の内径」及び「絶縁層の誘電率」と密接な相関関係を有する。もし、１つのシステムの内部に適用されている特性インピーダンスに違いがあれば、信号伝送中に反射損失（Ｒｅｆｌｅｃｔｉｏｎ Ｌｏｓｓ）が発生して伝送特性が悪くなるので、インピーダンスを整合させた設計は、ケーブル設計者のみならず、システム設計者にとっても非常に重要な課題である。   As can be seen from the above formula, the characteristic impedance has a close correlation with “the diameter of the inner conductor”, “the inner diameter of the metal shield layer”, and “the dielectric constant of the insulating layer”. If there is a difference in the characteristic impedance applied inside one system, reflection loss will occur during signal transmission and transmission characteristics will deteriorate. This is a very important issue not only for designers but also for system designers.

しかし、極細同軸ケーブル分野においては、上記のような特性インピーダンスに関する研究は殆ど進んでいない。そして、特許文献１及び特許文献２などはあるが、これらは主に内部導体を伝送する信号の外部漏洩を防止することを目的として、金属シールド層の内部又は外部に、電磁波のシールド特性に優れた金属層、又は金属が蒸着されたフィルム層を備えることなどに焦点が合わせられている。   However, in the field of micro coaxial cables, little research has been made on the characteristic impedance as described above. There are Patent Document 1 and Patent Document 2, and these are excellent in electromagnetic wave shielding characteristics inside or outside the metal shield layer mainly for the purpose of preventing external leakage of signals transmitted through the internal conductor. The focus is on having a metal layer or a film layer on which the metal is deposited.

従来の一般同軸ケーブル又は大口径同軸ケーブルは、その直径が通常５ｍｍ〜４２ｍｍ程度であって、内部導体、絶縁層及び金属シールド層の直径が充分大きいため、特性制御の面においては十分なマージンがあり、絶縁層の制御も可能であった。しかし、極細同軸ケーブルにおいては、全体の直径が１ｍｍ以下であり、内部導体、絶縁層及び金属シールド層の直径も微細である。従って、内部導体の外径が不均一になり絶縁層の外径基準の設計や金属シールド層の設計が容易ではなく、インピーダンスの不整合が発生する問題がある。このような問題を解決するための努力は関連分野で重ねられており、このような技術的背景下で本件発明が案出された。   Conventional general coaxial cables or large-diameter coaxial cables are usually about 5 mm to 42 mm in diameter, and the inner conductor, insulating layer, and metal shield layer have sufficiently large diameters, so that there is a sufficient margin in terms of characteristic control. In addition, the insulating layer could be controlled. However, in the micro coaxial cable, the entire diameter is 1 mm or less, and the diameters of the inner conductor, the insulating layer, and the metal shield layer are also minute. Therefore, the outer diameter of the inner conductor is not uniform, and the design of the outer diameter reference of the insulating layer and the design of the metal shield layer are not easy, and there is a problem that impedance mismatch occurs. Efforts to solve such problems have been repeated in related fields, and the present invention has been devised under such a technical background.

米国特許第６１３０３８５号US Pat. No. 6,130,385 米国特許公開２００３−５１８９７号公報US Patent Publication No. 2003-51897

本件発明が解決する課題は、優れたインピーダンス特性を有し、高周波の伝送の際にも反射損失がなく安定的な信号伝送が可能で、また、高周波伝送の際に信号の外部干渉を著しく抑制して高画質の伝送が可能な極細同軸ケーブルを提供することである。   The problem to be solved by the present invention is that it has excellent impedance characteristics, enables stable signal transmission without reflection loss even during high-frequency transmission, and significantly suppresses external interference of signals during high-frequency transmission Thus, an ultrafine coaxial cable capable of high-quality transmission is provided.

前述した本件発明が解決しようとする技術的課題を果たすために、本件発明の同軸ケーブルは、２本以上の第１極細金属線が０．５ｍｍ〜３．０ｍｍのピッチで捻れた内部導体と、当該内部導体を取り囲む誘電率１．２〜３．０の高分子材料で構成される絶縁層と、当該絶縁層を取り囲み、２本以上の第２極細金属線が横巻きピッチ２．０ｍｍ〜１０．０ｍｍで当該絶縁層を横巻きしてなる金属シールド層と当該金属シールド層を取り囲んで形成された保護被覆層とを備える極細同軸ケーブルとする。   In order to achieve the technical problem to be solved by the present invention described above, the coaxial cable of the present invention includes an inner conductor in which two or more first fine metal wires are twisted at a pitch of 0.5 mm to 3.0 mm, An insulating layer made of a polymer material having a dielectric constant of 1.2 to 3.0 surrounding the inner conductor, and two or more second fine metal wires surrounding the insulating layer and having a lateral winding pitch of 2.0 mm to 10 mm The micro coaxial cable is provided with a metal shield layer formed by horizontally winding the insulating layer at 0.0 mm and a protective coating layer formed so as to surround the metal shield layer.

前記内部導体を構成する第１極細金属線の捻れピッチは、１．０ｍｍ〜１．４ｍｍであることが好ましい。また、当該内部導体の直径は、０．０７ｍｍ〜０．１０ｍｍであることが好ましく、内部導体を構成する第１極細金属線の直径は、０．０１ｍｍ〜０．０４ｍｍであることが好ましい。   It is preferable that the twist pitch of the 1st ultrafine metal wire which comprises the said internal conductor is 1.0 mm-1.4 mm. Moreover, it is preferable that the diameter of the said internal conductor is 0.07 mm-0.10 mm, and it is preferable that the diameter of the 1st extra fine metal wire which comprises an internal conductor is 0.01 mm-0.04 mm.

そして、前記内部導体を構成する第１極細金属線は、銅合金で構成されることが好ましい。   And it is preferable that the 1st extra fine metal wire which comprises the said internal conductor is comprised with a copper alloy.

また、前記絶縁層の誘電率は、１．５〜２．５であることがより好ましく、当該絶縁層は、フッ素系樹脂を用いたものであることが好ましい。そして、前記フッ素系樹脂は、四フッ化エチレン・パーフルオロアルキルビニルエーテル共重合樹脂（ＰｅｒＦｌｕｏｒｏ Ａｌｋｏｘｙ Ｒｅｓｉｎ：以下、「ＰＦＡ樹脂」と称する。）を用いることが更に好ましい。   The dielectric constant of the insulating layer is more preferably 1.5 to 2.5, and the insulating layer is preferably made of a fluorine-based resin. The fluororesin is more preferably a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer resin (PerFluor Alkoxy Resin: hereinafter referred to as “PFA resin”).

また、前記金属シールド層を構成する第２極細金属線の横巻きピッチは、３．０ｍｍ〜４．５ｍｍであることがより好ましく、当該金属シールド層を構成する第２極細金属線は、当該内部導体を構成する第１極細金属線の捻じり方向と反対方向に横巻きされることがより好ましい。   The horizontal winding pitch of the second ultrafine metal wire constituting the metal shield layer is more preferably 3.0 mm to 4.5 mm, and the second ultrafine metal wire constituting the metal shield layer is the internal More preferably, the first ultrafine metal wire constituting the conductor is laterally wound in a direction opposite to the twisting direction.

また、前記金属シールド層を構成する第２極細金属線は、銅合金で構成されることが好ましい。   Moreover, it is preferable that the 2nd extra fine metal wire which comprises the said metal shield layer is comprised with a copper alloy.

また、前記金属シールド層を構成する第２極細金属線の直径は、０．０２ｍｍ〜０．０４ｍｍであることが好ましく、前記金属シールド層を構成する第２極細金属線の本数は、１５〜３５本であることが好ましい。   Moreover, it is preferable that the diameter of the 2nd ultrafine metal wire which comprises the said metal shield layer is 0.02 mm-0.04 mm, and the number of the 2nd ultrafine metal wire which comprises the said metal shield layer is 15-35. A book is preferred.

本件発明は、さらに、２本以上の第１極細金属線が所定のピッチで捻れた内部導体と、当該内部導体を取り囲み、高分子材料で構成される絶縁層と、所定のピッチで当該内部導体を構成する第１極細金属線の捻じり方向と反対方向に横巻きされた２本以上の第２極細金属線で当該絶縁層を取り囲んで形成された金属シールド層と当該金属シールド層を取り囲んで形成された保護被覆層とを備える極細同軸ケーブルを提供する。   The present invention further includes an inner conductor in which two or more first fine metal wires are twisted at a predetermined pitch, an insulating layer surrounding the inner conductor and made of a polymer material, and the inner conductor at a predetermined pitch. A metal shield layer formed by surrounding two or more second fine metal wires that are wound in the opposite direction to the twisting direction of the first fine metal wire constituting the metal layer, and surrounding the metal shield layer An ultrafine coaxial cable including a protective covering layer formed is provided.

本件発明に係る極細同軸ケーブルは、２本以上の第１極細金属線が０．５〜３ｍｍのピッチで捻れた内部導体と、当該内部導体を取り囲み、誘電率１．２〜３．０の高分子材料で構成される絶縁層と、当該絶縁層を取り囲み、２本以上の第２極細金属線が横巻きピッチ２．０〜１０．０ｍｍで当該絶縁層を横巻きしてなる金属シールド層と、当該金属シールド層を取り囲んで形成された保護被覆層とを備えるものであり、優れたインピーダンス特性を有し、高周波伝送の際にも反射損失なく安定的な信号伝送が可能であり、高周波伝送の際に信号の外部干渉を著しく抑制して高画質の伝送が可能であり、反復的な曲げにも安定した機械的特性が確保できる。   The micro coaxial cable according to the present invention includes an inner conductor in which two or more first extra fine metal wires are twisted at a pitch of 0.5 to 3 mm and a high dielectric constant of 1.2 to 3.0. An insulating layer made of a molecular material, a metal shield layer surrounding the insulating layer, and two or more second fine metal wires horizontally winding the insulating layer at a horizontal winding pitch of 2.0 to 10.0 mm And a protective coating layer that surrounds the metal shield layer, has excellent impedance characteristics, enables stable signal transmission without reflection loss even during high-frequency transmission, and high-frequency transmission In this case, the external interference of the signal is remarkably suppressed and high-quality image transmission is possible, and stable mechanical characteristics can be ensured even during repetitive bending.

以下、本件発明の好ましい実施形態を詳しく説明する。しかし、本件発明に係る明細書及び請求範囲に用いられている用語や単語は、通常の意味や辞書に記載の意味に限定して解釈されるものではなく、発明者は自分の発明を最善の方法で説明するために用語の概念を適切に定義することができるという原則に則り、本件発明の技術的思想に符合する意味と概念とに解釈すべきものである。従って、本明細書に記載された実施形態は、本件発明の最も好ましい一実施形態に過ぎず、本件発明の技術的思想の全てを代弁するものではないため、本出願時点においてこれらに代替できる多様な均等物と変形例があり得ることを断っておく。   Hereinafter, preferred embodiments of the present invention will be described in detail. However, the terms and words used in the specification and claims of the present invention are not construed as being limited to ordinary meanings or meanings described in a dictionary, and the inventor is the best in his invention. In accordance with the principle that the concept of a term can be appropriately defined for explaining in a method, it should be interpreted as a meaning and a concept consistent with the technical idea of the present invention. Therefore, the embodiment described in the present specification is only the most preferable embodiment of the present invention, and does not represent all of the technical idea of the present invention. It should be noted that there can be equivalents and variations.

本件発明に係る極細同軸ケーブルは、内部導体、当該内部導体を取り囲んで形成された絶縁層、当該絶縁層を取り囲んで形成された金属シールド層及び当該金属シールド層を取り囲んで形成された保護被覆層を備えるものであって、内部導体、絶縁層及び金属シールド層の構成が最適化され、優れたインピーダンス特性を有するので、高周波伝送の際にも反射損失なく安定的な信号伝送が可能であり、また、高周波伝送の際に信号の外部干渉を著しく抑制するので、高画質の伝送が可能である。   The micro coaxial cable according to the present invention includes an inner conductor, an insulating layer formed surrounding the inner conductor, a metal shield layer formed surrounding the insulating layer, and a protective coating layer formed surrounding the metal shield layer. Since the configuration of the inner conductor, insulating layer and metal shield layer is optimized and has excellent impedance characteristics, stable signal transmission without reflection loss is possible even during high-frequency transmission, Further, since external interference of signals is remarkably suppressed during high-frequency transmission, high-quality transmission is possible.

図１は、本件発明の一実施形態における極細同軸ケーブルの斜視図である。図１に示すように、本件発明の１つの実施形態におけるる極細同軸ケーブルは、内部導体１１と、当該内部導体に面しながら当該内部導体を取り囲んで形成された絶縁層１３、当該絶縁層に面しながら当該絶縁層を取り囲むように形成された金属シールド層１７及び当該金属シールド層に面しながら当該金属シールド層を取り囲むように形成された保護被覆層１９とを備えている。   FIG. 1 is a perspective view of a micro coaxial cable according to an embodiment of the present invention. As shown in FIG. 1, the micro coaxial cable according to one embodiment of the present invention includes an inner conductor 11, an insulating layer 13 formed so as to surround the inner conductor while facing the inner conductor, and the insulating layer. A metal shield layer 17 is formed so as to surround the insulating layer while facing it, and a protective coating layer 19 is formed so as to surround the metal shield layer while facing the metal shield layer.

前記内部導体１１は、２本以上の第１極細金属線からなり、当該第１極細金属線は所定のピッチで捻れて内部導体１１を形成する。当該ピッチは０．５ｍｍ〜３．０ｍｍが好ましく、１．０ｍｍ〜１．４ｍｍがさらに好ましい。当該ピッチが０．５ｍｍ未満の場合には、内部導体の外径が無駄に大きくなって屈曲特性が悪くなる。一方、当該ピッチが３．０ｍｍを超えると、第１極細金属線で構成される内部導体が稠密に連結されず隙間が生じてしまいコネクターを連結する際に接点不良を誘発することがある。前記第１極細金属線の直径は、周波数特性（ＲＦ：Ｒａｄｉｏ Ｆｒｅｑｕｅｎｃｙ）を考慮すると、０．０１ｍｍ〜０．０４ｍｍであることが好ましい。また、前記第１極細金属線は、電気伝導性及び経済性などを考慮すると、銅合金で構成されることが好ましい。このような構成を有する内部導体１１自体の直径は、第１極細金属線の前記ピッチ条件と、第１極細金属線の直径及び同軸ケーブルのインピーダンス特性を考慮すると、０．０７ｍｍ〜０．１０ｍｍとすることが好ましい。   The inner conductor 11 is composed of two or more first fine metal wires, and the first fine metal wires are twisted at a predetermined pitch to form the inner conductor 11. The pitch is preferably 0.5 mm to 3.0 mm, and more preferably 1.0 mm to 1.4 mm. When the pitch is less than 0.5 mm, the outer diameter of the inner conductor becomes unnecessarily large and the bending characteristics are deteriorated. On the other hand, if the pitch exceeds 3.0 mm, the internal conductor composed of the first ultrafine metal wire is not densely connected and a gap is formed, which may cause a contact failure when connecting the connectors. The diameter of the first ultrafine metal wire is preferably 0.01 mm to 0.04 mm in consideration of frequency characteristics (RF: Radio Frequency). In addition, the first fine metal wire is preferably made of a copper alloy in consideration of electrical conductivity and economy. In consideration of the pitch condition of the first fine metal wire, the diameter of the first fine metal wire, and the impedance characteristics of the coaxial cable, the diameter of the inner conductor 11 itself having such a configuration is 0.07 mm to 0.10 mm. It is preferable to do.

前記内部導体の外周面には、高分子樹脂で構成される絶縁層１３が、押出機を用いて被覆される。前記高分子樹脂の誘電率（ε）は、１．２〜３．０であることが好ましく、１．５〜２．５であることがより好ましい。１．２未満の誘電率は、高分子材料を発泡させても実現が難しく、誘電率が３．０を超過すれば信号の高速伝送が困難になる。前記高分子樹脂の種類は特に限定されないが、溶融粘度が低くて加工が容易なフッ素系樹脂が好ましく、その中でもＰＦＡ樹脂が最も好ましく用いられる。絶縁層１３では、誘電率をさらに低くするために、高分子を発泡させて、絶縁層内に発泡セルを形成させることもできる。絶縁層形成の際に、押出機のノズルは、発泡した絶縁層が内部導体の外周面をすぐ覆うように共押出（Ｃｏ‐ｅｘｔｒｕｓｉｏｎ）し、発泡した絶縁体が押し出されながら被覆することが好ましい。   The outer peripheral surface of the inner conductor is covered with an insulating layer 13 made of a polymer resin using an extruder. The dielectric constant (ε) of the polymer resin is preferably 1.2 to 3.0, and more preferably 1.5 to 2.5. A dielectric constant of less than 1.2 is difficult to realize even if the polymer material is foamed, and if the dielectric constant exceeds 3.0, high-speed signal transmission becomes difficult. The type of the polymer resin is not particularly limited, but a fluorine resin having a low melt viscosity and easy processing is preferable, and among them, a PFA resin is most preferably used. In the insulating layer 13, in order to further lower the dielectric constant, a polymer can be foamed to form a foam cell in the insulating layer. When forming the insulating layer, it is preferable that the nozzle of the extruder is co-extruded (co-extrusion) so that the foamed insulating layer immediately covers the outer peripheral surface of the inner conductor, and the foamed insulator is covered while being extruded. .

絶縁層の外周部には、電磁波信号（Ｅｌｅｃｔｒｏｍａｇｎｅｔｉｃ Ｓｉｇｎａｌ）の損失を抑制するために、２本以上の第２極細金属線を横巻きして、誘電体が完全に取り囲まれるように金属シールド層１７を形成する。前記第２極細金属線の横巻きピッチは、２．０ｍｍ〜１０．０ｍｍ（角度としては２０〜４度）であることが好ましく、３．５ｍｍ〜４．５ｍｍであることがより好ましい。ピッチが２．０ｍｍ未満では、無駄に稠密なピッチにより金属シールド層が厚くなりすぎ、金属線の使用量が過剰で、横巻き体（第２極細金属線）が他の横巻き体上に乗り上げたりするため、曲げ特性が悪くなる。一方、１０．０ｍｍを超えると、横巻き体が形状を維持できずに乱れるか、横巻き体間の間隔が空いてＴＥＭ（Ｔｒａｎｓｖｅｒｓｅ Ｅｌｅｃｔｒｏ Ｍａｇｎｅｔｉｃ）波が有効に伝送できないか、又は特性インピーダンスの不均一を引き起こすことになる。横巻きピッチ、絶縁層の厚さ、特性インピーダンスなどを考慮すると、前記第２極細金属線の直径は、０．０２ｍｍ〜０．０４ｍｍであることが好ましく、第２極細金属線の本数は１５〜３５本であることが好ましい。また、第２極細金属線は電気伝導性及び経済性を考慮すると、銅合金で構成されることが好ましい。   In order to suppress the loss of the electromagnetic signal (Electromagnetic Signal), the metal shield layer 17 is wound around the outer peripheral portion of the insulating layer so that the dielectric is completely surrounded by horizontally winding two or more second fine metal wires. Form. The horizontal winding pitch of the second ultrafine metal wire is preferably 2.0 mm to 10.0 mm (20 to 4 degrees as an angle), and more preferably 3.5 mm to 4.5 mm. If the pitch is less than 2.0 mm, the metal shield layer becomes too thick due to a useless dense pitch, the amount of metal wire used is excessive, and the horizontal winding (second extra fine metal wire) rides on the other horizontal winding. The bending characteristics deteriorate. On the other hand, if it exceeds 10.0 mm, the horizontal windings may be disturbed without maintaining their shape, or the space between the horizontal windings will be widened, and TEM (Transverse Electro Magnetic) waves cannot be transmitted effectively, or the characteristic impedance will be poor. It will cause uniformity. Considering the horizontal winding pitch, the thickness of the insulating layer, the characteristic impedance, etc., the diameter of the second ultrafine metal wire is preferably 0.02 mm to 0.04 mm, and the number of the second ultrafine metal wires is 15 to The number is preferably 35. The second ultrafine metal wire is preferably made of a copper alloy in consideration of electrical conductivity and economy.

金属シールド層を構成する第２極細金属線の横巻き方向は、内部導体を構成する第２極細金属線の捻じり方向と反対方向であることが好ましい。横巻き方向この様にすれば、インピーダンス特性に優れるのみならず、反復的な曲げによる機械的特性も良好であり、一方向に反る現象の発生も抑制できる。   It is preferable that the horizontal winding direction of the second ultrafine metal wire constituting the metal shield layer is opposite to the twisting direction of the second ultrafine metal wire constituting the internal conductor. Horizontal winding direction In this way, not only is the impedance characteristic excellent, but the mechanical characteristics due to repetitive bending are also good, and the occurrence of a phenomenon that warps in one direction can be suppressed.

図２は、横巻き体が横巻きされる過程を模式的に示している。内部導体及びその外周部に絶縁層が形成されている線材２１は、Ａ方向に回転しながらＢ方向に進む。すると、第２極細金属線２７が巻き取りされたミニボビン（Ｂｏｂｂｉｎ）２５から出た第２極細金属線２７が、所定ピッチで線材に横巻きされて、金属シールド層が形成されたケーブル２３が製造される。   FIG. 2 schematically shows a process in which the horizontally wound body is horizontally wound. The wire 21 having an inner conductor and an insulating layer formed on the outer periphery thereof proceeds in the B direction while rotating in the A direction. Then, the second ultrafine metal wire 27 coming out of the mini bobbin 25 around which the second ultrafine metal wire 27 is wound is horizontally wound around the wire at a predetermined pitch, and the cable 23 in which the metal shield layer is formed is manufactured. Is done.

図３及び図４は、本件発明に係る構成を有する金属シールド層の表面写真である。また、図６及び図７は、従来の技術による金属シールド層の表面写真である。従来の技術によれば、金属シールド層に、図６に示したような横巻き体の空き、又は図７に示したような横巻き体の乗り上げのような問題があった。しかし、本件発明に係る構成を備える金属シールド層は、図３及び図４に示すように、このような問題が全くないことが分かる。   3 and 4 are photographs of the surface of the metal shield layer having the configuration according to the present invention. 6 and 7 are photographs of the surface of the metal shield layer according to the conventional technique. According to the prior art, there has been a problem in the metal shield layer such as the empty space of the horizontally wound body as shown in FIG. 6 or the running of the horizontally wound body as shown in FIG. However, it can be seen that the metal shield layer having the configuration according to the present invention does not have such a problem as shown in FIGS.

前記金属シールド層の外周部には、同軸ケーブルの保護のための保護被覆層１９が形成される。前記保護被覆層１９は、従来の同軸ケーブルの保護被覆層の形成のために用いうる材料から選択して用いることができる。   A protective coating layer 19 for protecting the coaxial cable is formed on the outer periphery of the metal shield layer. The protective coating layer 19 can be selected from materials that can be used for forming a protective coating layer of a conventional coaxial cable.

図５は、本件発明に係る極細同軸ケーブルの特性インピーダンス（Ｚ：Ｃｈａｒａｃｔｅｒｉｓｔｉｃ Ｉｍｐｅｄａｎｃｅ）を、インピーダンス分析機（Ｉｍｐｅｄａｎｃｅ Ａｎａｌｙｚｅｒ）で測定した結果を模式的に示している。図５から、特性インピーダンスは上下限値内でほぼ均一に維持されている。   FIG. 5 schematically shows the result of measuring the characteristic impedance (Z: Characteristic Impedance) of the micro coaxial cable according to the present invention by using an impedance analyzer (Impedance Analyzer). From FIG. 5, the characteristic impedance is maintained substantially uniform within the upper and lower limit values.

図８は、従来の同軸ケーブルの特性インピーダンスを、インピーダンス分析機で測定した結果を模式的に示している。図６から、特性インピーダンスが時間軸方向で変動していることが分かり、特に変動が大きな部分においては、規格の上限と下限に近接しており、特性が安定していない。   FIG. 8 schematically shows the result of measuring the characteristic impedance of a conventional coaxial cable with an impedance analyzer. From FIG. 6, it can be seen that the characteristic impedance fluctuates in the time axis direction. In particular, in a portion where the fluctuation is large, the characteristic is not stable because it is close to the upper and lower limits of the standard.

以上のように、本件発明を限定された実施形態と図面とによって説明したが、本件発明はこれによって限定されるものではない。本件発明が属する技術分野において、通常の知識を有する者であれば、本件発明の技術思想と特許請求範囲の均等範囲内で多様な修正及び変形が可能なのは言うまでもない。   As described above, the present invention has been described with the limited embodiments and the drawings, but the present invention is not limited thereto. It goes without saying that a person having ordinary knowledge in the technical field to which the present invention belongs can make various modifications and variations within the technical scope of the present invention and the equivalent scope of the claims.

本件発明に係る極細同軸ケーブルは、優れたインピーダンス特性を有しており、高周波伝送の際にも反射損失なく安定的な信号伝送が可能である。また、高周波伝送の際に信号の外部干渉を有効に抑制しするので高画質の伝送が可能であり、反復的な曲げにも安定な機械的特性が確保できる。このような高性能の極細同軸ケーブルを用いれば、内視鏡及びポータブルマルチメディア機器などの小型化を実現できる。   The micro coaxial cable according to the present invention has excellent impedance characteristics, and can perform stable signal transmission without reflection loss even during high-frequency transmission. Further, since external interference of signals is effectively suppressed during high-frequency transmission, high-quality transmission is possible, and stable mechanical characteristics can be ensured even with repeated bending. By using such a high-performance micro coaxial cable, it is possible to reduce the size of endoscopes and portable multimedia devices.

本明細書に添付される下記の図面は本件発明の好ましい実施形態を例示するものであって、発明の詳細な説明とともに本件発明の技術思想をさらに理解させる役割を果たすものであるため、本件発明はそのような図面に記載された事項にのみ限定されて解釈されてはいけない。
本件発明の一実施形態にる極細同軸ケーブルの構造を概略的に示した斜視図である。 横巻き体が横巻きされる過程を図式的に示した図である。 本件発明に係る構成を有する金属シールド層の表面写真である。 本件発明に係る構成を有する金属シールド層の表面写真である。 本件発明に係る極細同軸ケーブルの特性インピーダンス（Ｚ：Ｃｈａｒａｃｔｅｒｉｓｔｉｃ Ｉｍｐｅｄａｎｃｅ）をインピーダンス分析機（Ｉｍｐｅｄａｎｃｅ Ａｎａｌｙｚｅｒ）で測定した結果を模式的に示した図である。 従来の技術における金属シールド層の表面写真である。 従来の技術における金属シールド層の表面写真である。 従来の極細同軸ケーブルの特性インピーダンスをインピーダンス分析機で測定した結果を模式的に示した図である。 The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of the present invention together with the detailed description of the invention. Should not be construed as being limited to the matter described in such drawings.
It is the perspective view which showed roughly the structure of the micro coaxial cable which concerns on one Embodiment of this invention. It is the figure which showed typically the process in which a horizontal winding body is laterally wound. It is a surface photograph of the metal shield layer which has the composition concerning the present invention. It is a surface photograph of the metal shield layer which has the composition concerning the present invention. It is the figure which showed typically the result of having measured the characteristic impedance (Z: CharacteristicImpedance) of the micro coaxial cable which concerns on this invention with the impedance analyzer (Impedance Analyzer). It is the surface photograph of the metal shield layer in a prior art. It is the surface photograph of the metal shield layer in a prior art. It is the figure which showed typically the result of having measured the characteristic impedance of the conventional micro coaxial cable with the impedance analyzer.

符号の説明Explanation of symbols

１１ 内部導体
１３ 絶縁層
１７ 金属シールド層
１９ 保護被覆層
２１ 内部導体の外周部に絶縁層が形成された線材
２３ ケーブル
２５ ミニボビン
２７ 第２極細金属線
Ａ 線材の回転方向
Ｂ 線材の進行方向 DESCRIPTION OF SYMBOLS 11 Inner conductor 13 Insulating layer 17 Metal shield layer 19 Protective coating layer 21 Wire rod in which an insulating layer is formed on the outer peripheral portion of the inner conductor 23 Cable 25 Mini bobbin 27 Second ultrafine metal wire A Wire rotation direction B Wire rod traveling direction

Claims (10)

同軸ケーブルにおいて、
２本以上の第１極細金属線が０．５ｍｍ〜３．０ｍｍのピッチで捻れた内部導体と、当該内部導体を取り囲む、誘電率１．２〜３．０の高分子材料で構成される絶縁層と、当該絶縁層を取り囲み、２本以上の第２極細金属線が横巻きピッチ２．０ｍｍ〜１０．０ｍｍで当該絶縁層を横巻きした金属シールド層と当該金属シールド層を取り囲んで形成された保護被覆層とを備えることを特徴とする極細同軸ケーブル。 For coaxial cable,
An insulation composed of an inner conductor in which two or more first fine metal wires are twisted at a pitch of 0.5 mm to 3.0 mm and a polymer material having a dielectric constant of 1.2 to 3.0 surrounding the inner conductor. A metal shield layer that surrounds the insulating layer and two or more second ultrafine metal wires are wound around the insulating layer at a transverse winding pitch of 2.0 mm to 10.0 mm and the metal shield layer. An extra fine coaxial cable comprising a protective coating layer. 前記内部導体の直径は、０．０７ｍｍ〜０．１０ｍｍである請求項１に記載の極細同軸ケーブル。 The micro coaxial cable according to claim 1, wherein the inner conductor has a diameter of 0.07 mm to 0.10 mm. 前記内部導体を構成する第１極細金属線は、銅合金を用いたものである請求項１又は請求項２に記載の極細同軸ケーブル。 3. The micro coaxial cable according to claim 1, wherein the first ultra fine metal wire constituting the inner conductor uses a copper alloy. 前記内部導体を構成する第１極細金属線の直径は、０．０１ｍｍ〜０．０４ｍｍである請求項１〜請求項３のいずれかに記載の極細同軸ケーブル。 The diameter of the 1st ultrafine metal wire which comprises the said internal conductor is 0.01 mm-0.04 mm, The ultrafine coaxial cable in any one of Claims 1-3. 前記絶縁層は、フッ素系樹脂を用いたものである請求項１〜請求項４のいずれかに記載の極細同軸ケーブル。 The micro coaxial cable according to any one of claims 1 to 4, wherein the insulating layer uses a fluorine-based resin. 前記フッ素系樹脂は、四フッ化エチレン・パーフルオロアルキルビニルエーテル共重合樹脂である請求項５に記載の極細同軸ケーブル。 The micro coaxial cable according to claim 5, wherein the fluororesin is a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer resin. 前記金属シールド層を構成する第２極細金属線は、銅合金を用いたものである請求項１〜請求項６のいずれかに記載の極細同軸ケーブル。 The ultrafine coaxial cable according to any one of claims 1 to 6, wherein the second ultrafine metal wire constituting the metal shield layer uses a copper alloy. 前記金属シールド層を構成する第２極細金属線の直径は、０．０２ｍｍ〜０．０４ｍｍである請求項１〜請求項７のいずれかに記載の極細同軸ケーブル。 The diameter of the 2nd extra fine metal wire which comprises the said metal shield layer is 0.02 mm-0.04 mm, The micro coaxial cable in any one of Claims 1-7. 前記金属シールド層を構成する第２極細金属線の本数は、１５本〜３５本である請求項１〜請求項８のいずれかに記載の極細同軸ケーブル。 The number of the 2nd extra fine metal wires which comprise the said metal shield layer is 15-35, The micro coaxial cable in any one of Claims 1-8. 同軸ケーブルであって、
２本以上の第１極細金属線が所定のピッチで捻れた内部導体と、当該内部導体を取り囲み、高分子材料で構成される絶縁層と、所定のピッチで当該内部導体を構成する第１極細金属線の捻じり方向と反対方向に横巻きされた２本以上の第２極細金属線を用いて当該絶縁層を取り囲んで形成された金属シールド層と当該金属シールド層を取り囲んで形成された保護被覆層とを備えることを特徴とする極細同軸ケーブル。 A coaxial cable,
An inner conductor in which two or more first ultrafine metal wires are twisted at a predetermined pitch, an insulating layer that surrounds the inner conductor and is made of a polymer material, and a first ultrafine that constitutes the inner conductor at a predetermined pitch A metal shield layer formed by surrounding two or more second fine metal wires wound in a direction opposite to the twisting direction of the metal wire and surrounding the insulating layer, and a protection formed by surrounding the metal shield layer An extra fine coaxial cable comprising a coating layer.
JP2007188675A 2006-07-21 2007-07-19 Superfine coaxial cable Pending JP2008027914A (en)

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JP2010198973A (en) * 2009-02-26 2010-09-09 Sumitomo Electric Ind Ltd Coaxial cable and method of manufacturing the same
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US20150008011A1 (en) * 2012-03-21 2015-01-08 Leoni Kabel Holding Gmbh Signal cable for high frequency signal transmission and method of transmission

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