JP3681165B2

JP3681165B2 - communication cable

Info

Publication number: JP3681165B2
Application number: JP2001331312A
Authority: JP
Inventors: 建也渕上; 寿雄及川; 浩田中; 吉孝細川; 博季梁井; 俊朗中尾
Original assignee: Daiden Co Inc; Nippon Telegraph and Telephone Corp
Current assignee: Daiden Co Inc; Nippon Telegraph and Telephone Corp
Priority date: 2001-10-29
Filing date: 2001-10-29
Publication date: 2005-08-10
Anticipated expiration: 2021-10-29
Also published as: JP2003132744A

Description

【０００１】
【発明の属する技術分野】
本発明は、ＬＡＮ間伝送用に使用される通信ケ−ブルに関し、特に４本の絶縁線芯を星形カッド状に撚り合わせた通信ケ−ブルに関するものである。
【０００２】
【従来の技術】
従来より、ＬＡＮや高速インタ−フェ−ス用の通信ケーブルとして８芯のツイストペアケ−ブルが使用されおり、このツイストペアケ−ブルは２本の絶縁線芯を撚り合わせて一対とし、この一対を４組集合させた状態でポリ塩化ビニル等のプラスチック材からなる外部被覆に収容される構成とし、４組のうち２組で送信・受信をして主に前述した高速デ−タ伝送の用途に使用される。また、星型カッドケーブルは、４本の絶縁線芯を星形カッド状に撚り合わせ、ポリ塩化ビニル等のプラスチック材からなる外部被覆に収容される構成とし、主に構内ケーブルとして使用されている。
【０００３】
【発明が解決しようとする課題】
前記従来の通信ケーブルにおいて、ツイストペアケ−ブルは漏話が小さいが４組の対構造のため外径寸法が大きくなり線路スペースの確保が難しいという課題を有し、また、星型カッドケーブルはツイストペアケーブルよりも外径寸法が小さくできるものの、屈曲や外部応力によりカッド崩れが生じると漏話が大きくなるという課題を有する。
【０００４】
本発明は前記課題を解消するためになされたもので、収納体積を小さくして取り扱いや設置が行いやすく、カッド崩れを防止して漏話の発生を抑制する通信ケーブルを提案することを目的とする。
【０００５】
【課題を解決するための手段】
本発明に係る通信ケーブルは、外径が０．２〜０．８ｍｍの導体を絶縁被覆した絶縁線芯を４本組み合わせて星形カッド状に撚りピッチを１０〜２０ｍｍとして撚り合わせ、当該撚り合わせた４本の絶縁線芯の外側に熱可塑性樹脂からなる外部被覆を前記４本の絶縁線芯が形成する星形カッド状の溝にくい込ませるように施すものである。このように本発明においては、４本の絶縁線芯の撚りピッチを小さくして、熱可塑性樹脂からなる外部被覆を前記４本の絶縁線芯が形成する星形カッド状の溝に狭入させているので、外力が働いてもカッド崩れが防止されて漏話の発生の防止維持をすることができる。また、４芯でかつ星型カッド状に形成されているので、外径が極めて小さくなり、通常のＬＡＮ用ケーブルと比べると、屈曲性が高く取り回しし易く、ドアの下部の狭い隙間等にも容易に配線でき、表面が滑らかで、束容積・重量が共に小さく持ち運びや保管に便利である。
【０００６】
また、本発明に係る通信ケーブルは必要に応じて、各絶縁線芯の表面における長手方向に凸凹を形成するものである。このように本発明においては、４本の各絶縁線芯の表面における長手方向に凸凹を形成しているので、４本の各絶縁線芯の表面における凸凹が互いに係合して外力が働いてもカッド崩れが防止されて著しく漏話の発生の防止維持をすることができる。
また、本発明に係る通信ケーブルは必要に応じて、各絶縁線芯の長手方向表面の面粗度を粗くするものである。このように本発明においては、前記４本の絶縁線芯の長手方向表面の面粗度を粗くしているので、各絶縁線芯相互の摩擦力が働き、外力が働いてもカッド崩れが防止されて漏話の発生の防止維持をすることができる。
【０００７】
また、本発明に係る通信ケーブルは必要に応じて、前記４本の絶縁線芯の対角方向に位置する２本と、他の２本との外径を異ならせて形成するものである。このように本発明においては、前記４本の絶縁線芯の対角方向に位置する２本の外径を他の２本の外径より小さくしているので、２本の外径が大きい絶縁線芯が配置されることで形成される２つの溝に２本の外径が小さい各絶縁線芯が嵌り外力が働いてもカッド崩れが防止されて漏話の発生の防止維持をすることができる。
【０００８】
また、本発明に係る通信ケーブルは必要に応じて、前記４本の絶縁線芯の対角方向に位置する２本と、他の２本との硬度を異ならせて形成するものである。このように本発明においては、前記４本の絶縁線芯の対角方向に位置する２本の硬度を他の２本の硬度より小さくしているので、２本の硬度が小さい絶縁線芯が配置されることで形成される２つの溝に対して２本の硬度が大きい各絶縁線芯が各溝に埋入して外力が働いてもカッド崩れが防止されて漏話の発生の防止維持をすることができる。
また、本発明に係る通信ケーブルは必要に応じて、前記４本の絶縁線芯を融着、接着又は粘着するものである。このように本発明においては、前記４本の絶縁線芯を融着、接着又は粘着するので、外力が働いても抵抗力が生じてカッド崩れが防止されて漏話の発生の防止維持をすることができる。
【０００９】
【発明の実施の形態】
（本発明の第１の実施形態）
以下、本発明の第１の実施形態に係る通信ケーブルを図１に基づいて説明する。図１は本実施形態に係る通信ケーブルの断面図を示す。
【００１０】
前記図１において本実施形態に係る通信ケーブルは、軟銅（例えば、直径０．５ｍｍ）で成形された導体２１とポリエチレン等で成形された絶縁体２２からなる絶縁線芯２（例えば、外径が０．８ｍｍ）を４本集合させて撚りピッチを１５ｍｍとする星形カッド状に撚り合わせ、この撚り合わせた４本の絶縁線芯２を塩化ビニル等の絶縁材で成形される外部被覆３で覆うという構成である。
前記外部被覆３は、電線押出機用ダイス（図示を省略）を用いて前記４本の絶縁線芯２より形成された星形カッドの溝に狭入させる構成である。
【００１１】
次に、本実施形態に係る通信ケーブルの形成動作について説明する。絶縁線芯２は、軟銅の導体２１を予め約８０〜１００℃の温度に予熱しておき、次に電線押出機用ダイスを有するスクリュー押出機（図示を省略）を用いてポリエチレン樹脂組成物を加熱混練し、電線押出機用ダイスより上記の予熱された導体２１上に約１８０〜２５０℃の温度でかつ８００ｍ／分〜２０００ｍ／分の被覆速度で被覆することにより製造される。
前記通信ケーブルは、前記４本の絶縁線芯２を星形カッド状の通信ケーブルに撚り合わせることにより製造される。この撚り合わせは、対をなす絶縁線芯２間の静電結合および電磁結合の平衡を図るためになされ、撚りピッチを１５ｍｍとして行い、絶縁線芯２相互間の漏話の低減を図るために、絶縁線芯２を４本集合させて行われる。その際、撚りピッチを１５ｍｍという短いピッチとしているので絶縁線芯２の撚りによる相互位置や撚りピッチは、変動することなく固定化される。
４本の絶縁線芯２が形成する星形カッド状の溝にポリ塩化ビニル等の熱可塑性樹脂からなる外部被覆３を狭入させて通信ケーブルは形成される。
【００１２】
以上のように本実施形態に係る通信ケーブルによれば、４本の絶縁線芯２の撚りピッチを小さくして、熱可塑性樹脂からなる外部被覆３を前記４本の絶縁線芯２が形成する星形カッド状の溝に狭入させているので、外力が働いてもカッド崩れが防止されて漏話の発生の防止維持をすることができる。また、４芯でかつ星型カッド状に形成されているので、外径が小さくなり、一般のＬＡＮ用通信ケーブルと比べると、屈曲性が高く取り回しし易く、ドアの下部の狭い隙間等にも容易に配線でき、表面が滑らかで、束容積・重量が共に小さく持ち運びや保管に便利である。
【００１３】
（本発明の第２の実施形態）
以下、本発明の第２の実施形態に係る通信ケーブルを図２及び図３に基づいて説明する。図２は本実施形態に係る通信ケーブルの断面図、図３は本実施形態に係る通信ケーブルにおける絶縁線芯２の斜視図を示す。
【００１４】
前記図２において本実施形態に係る通信ケーブルは、前記弟１の実施形態に係る通信ケーブルと同様に、導体２１と絶縁体２２からなる絶縁線芯２を４本集合させて星形カッド状に撚り合わせ、この撚り合わせた４本の絶縁線芯２を外部被覆３で覆うという構成とし、この構成に加えて、前記各絶縁線芯２の絶縁体２２の表面における長手方向に凸凹（例えば０．０１〜０．１ｍｍの溝を成形する）を成形する構成である。
前記各一対の絶縁線芯２における凸凹は、星形カッドの形状を保つことで各絶縁線芯２間の静電容量の均一性、電磁結合の減少を妨げず、漏話を大きくせずに成形する。
【００１５】
次に、本実施形態に係る通信ケーブルの形成動作について説明する。絶縁線芯２は、軟銅の導体２１を予め約８０〜１００℃の温度に予熱しておき、次に押出する物質の長手方向に凸凹ができるように成形した電線押出機用ダイスを有するスクリュー押出機を用いてポリエチレン樹脂組成物を加熱混練し、電線押出機用ダイスより上記の予熱された導体２１上に約１８０〜２５０℃の温度でかつ８００ｍ／分〜２０００ｍ／分の被覆速度で被覆することにより製造される。図３は、上記のようにして製造された絶縁線芯２の斜視図を示す。
以下、前記第１の実施形態の通信ケーブルと同様に、形成される。
以上のように本実施形態に係る通信ケーブルによれば、４本の各絶縁線芯２の表面における長手方向に凸凹に成形しているので、この４本の各絶縁線芯２の表面の凸凹が互いに係合して外力が働いてもカッド崩れが防止されて著しく漏話の発生の防止維持をすることができる。
【００１６】
（本発明の第３の実施形態）
以下、本発明の第１の実施形態に係る通信ケーブルを図４に基づいて説明する。図４は本実施形態に係る通信ケーブルの断面図を示す。
前記図４において本実施形態に係る通信ケーブルは、導体２１と絶縁体２２からなる絶縁線芯２を４本集合させて星形カッド状に撚り合わせ、この撚り合わせた４本の絶縁線芯２を外部被覆３で覆うという構成とし、この構成に加えて、対角方向に位置する２本の絶縁線芯２ａ（例えば、外径が０．５〜０．８ｍｍ）の外径を他の絶縁線芯２ｂ（例えば、外径が０．７５〜１．２ｍｍ）の２本の外径より小さくする構成である。
前記各２本の絶縁線芯２における外径の大きさは、星形カッドの形状を保つことで各絶縁線芯２間の静電容量の均一性、電磁結合の減少を妨げず、漏話を大きくせずに成形する。
【００１７】
次に、本実施形態に係る通信ケーブルの形成動作について説明する。絶縁線芯２の製作は、軟銅の導体２１を予め約８０〜１００℃の温度に予熱する。次に前記対角方向に位置する各２本の絶縁線芯２毎に半径が異なるように押出成形する２種の電線押出機用ダイスを用意し、この２種の電線押出機用ダイスがそれぞれ取り付けられたスクリュー押出機を用いて絶縁線芯２として押出成形する。さらに具体的には、この電線押出機用ダイスにより上記予熱された導体２１上に約１８０〜２５０℃の温度でかつ８００ｍ／分〜２０００ｍ／分の被覆速度で加熱混練したポリエチレン樹脂組成物を被覆することにより、半径が異なる２種の絶縁線芯２ａ、２ｂが製造される。
【００１８】
前記通信ケーブルは、前記２本の絶縁線芯２ｂを対角方向に位置させて並べ、この２本の絶縁線芯２ｂが形成する２つの溝部２０ａ、２０ｂに対して各絶縁線芯２ａを配置させた状態で星形カッド状に撚り合わせることにより製造される。この撚り合わせは、対をなす絶縁線芯２ａと２ｂとの間の静電結合および電磁結合の平衡を図るためになされ、撚りピッチを１５ｍｍとして行い、絶縁線芯２ａ、２ｂ相互間の漏話の低減を図るために、絶縁線芯２ａ、２ｂを４本集合させて行われる。その際、撚りピッチを１５ｍｍという短いピッチとしているので絶縁線芯２ａ、２ｂの撚りによる相互位置や撚りピッチは、変動することなく固定化される。
４本の絶縁線芯２ａ、２ｂが形成する星形カッド状の溝にポリ塩化ビニル等の熱可塑性樹脂からなる外部被覆３を狭入させて通信ケーブルは形成される。
【００１９】
以上のように本実施形態に係る通信ケーブルによれば、対角方向に位置する２本の絶縁線芯２ａの外径を他の絶縁線芯２ｂの２本の外径より小さくしているので、２本の絶縁線芯２ｂにより形成される２つの溝部２０ａ、２０ｂに対して２本の絶縁線芯２ａが各溝部２０ａ、２０ｂに嵌っており外力が働いてもカッド崩れが防止されて漏話の発生の防止維持をすることができる。
【００２０】
（本発明の第４の実施形態）
以下、本発明の第１の実施形態に係る通信ケーブルを図５に基づいて説明する。図５は本実施形態に係る通信ケーブルの断面図を示す。
前記図５において本実施形態に係る通信ケーブルは、導体２１と絶縁体２２からなる絶縁線芯２を４本集合させて星形カッド状に撚り合わせ、この撚り合わせた４本の絶縁線芯２を外部被覆３で覆うという構成とし、この構成に加えて、対角方向に位置する２本の絶縁線芯２ａの外径を他の絶縁線芯２ｂの２本の外径より小さくし、絶縁線芯２ａの硬度（例えば、硬度が５８〜６５）を絶縁線芯２ｂの２本の硬度（例えば、硬度が４４〜５４）より大きくする構成である。
前記絶縁線芯２ａ、２ｂにおける硬度及び外径の大きさは、星形カッドの形状を保つことで各絶縁線芯２間の静電容量の均一性、電磁結合の減少を妨げず、漏話を大きくせずに成形する。
【００２１】
次に、本実施形態に係る通信ケーブルの形成動作について説明する。絶縁線芯２の製作は、軟銅の導体２１を予め約８０〜１００℃の温度に予熱する。次に前記対角方向に位置する各２本の絶縁線芯２毎に半径が異なるように押出成形する２種の電線押出機用ダイスを用意し、この２種の電線押出機用ダイスがそれぞれ取り付けられた２台のスクリュー押出機を用いて絶縁線芯２として押出成形する。さらに具体的には、上記予熱された導体２１上に約１８０〜２５０℃の温度でかつ８００ｍ／分〜２０００ｍ／分の被覆速度で、硬化後の硬度が異なるように２種のポリエチレン系樹脂組成物をそれぞれ内包する各スクリュー押出機の電線押出機用ダイスによりを被覆することにより、半径と硬度とが異なる２種の絶縁線芯２ａ、２ｂが製造される。
【００２２】
前記通信ケーブルは、前記２本の絶縁線芯２ｂを対角方向に位置させて並べ、この２本の絶縁線芯２ｂが形成する２つの溝部２０ａ、２０ｂに対して各絶縁線芯２ａを埋入させた状態で星形カッド状に撚り合わせることにより製造される。この撚り合わせは、対をなす絶縁線芯２ａと２ｂとの間の静電結合および電磁結合の平衡を図るためになされ、撚りピッチを１５ｍｍとして行い、絶縁線芯２ａ、２ｂ相互間の漏話の低減を図るために、絶縁線芯２ａ、２ｂを４本集合させて行われる。その際、撚りピッチを１５ｍｍという短いピッチとしているので絶縁線芯２ａ、２ｂの撚りによる相互位置や撚りピッチは、変動することなく固定化される。
４本の絶縁線芯２ａ、２ｂが形成する星形カッド状の溝にポリ塩化ビニル等の熱可塑性樹脂からなる外部被覆３を狭入させて通信ケーブルは形成される。
【００２３】
以上のように本実施形態に係る通信ケーブルによれば、対角方向に位置する２本の絶縁線芯２ａの外径を他の絶縁線芯２ｂの２本の外径より小さくし、対角方向に位置する２本の絶縁線芯２ａの硬度を他の絶縁線芯２ｂの２本の硬度より大きくしているので、２本の絶縁線芯２ｂが配置されることで形成される２つの溝部２０ａ、２０ｂに対して２本の絶縁線芯２ａが各溝に埋入しており、外力が働いてもカッド崩れが防止されて漏話の発生の防止維持をすることができる。
【００２４】
（その他の実施形態）
なお、前記各実施形態に係る通信ケーブルにおいて、絶縁線芯２を電線押出機用ダイスより押出させる際に、被覆速度の変動や加熱混練する樹脂組成物を変更することにより、絶縁線芯２の表面の粗度（例えば、表面粗さが０．０３〜０．１２μｍ）を変更することもでき、４本の各絶縁線芯２相互の摩擦力を高らしめて、外力が働いてもカッド崩れが防止されて漏話の発生の防止維持をすることができる。図６は、前記粗度を変更した絶縁線芯２の斜視図である。
【００２５】
また、前記各実施形態に係る通信ケーブルにおいて、通信ケーブルの外周には、上記したポリ塩化ビニル等の熱可塑性樹脂からなる外部被覆３を被せる前に、部分的に紙、織布等でつくったテープで押え巻きすることもできる。
また、前記各実施形態に係る通信ケーブルにおいて、４本の絶縁線芯２を撚り合わせる前に、４本の絶縁線芯２を約２００℃まで加熱して星型カッド状で融着させることもできる。
また、前記各実施形態に係る通信ケーブルにおいて、４本の絶縁線芯２を撚り合わせる前に、４本の絶縁線芯２を接着材により星型カッド状で接着させることもできる。
【００２６】
また、前記各実施形態に係る通信ケーブルにおいて、絶縁体２２をポリエチレンと接着剤を混練させて成形させることもでき、この絶縁体２２からなる絶縁線芯２が粘着性をもつことができる。
また、前記各実施形態に係る通信ケーブルにおいて、外部被覆３と４本の絶縁線芯２から形成される星型カッドとのクリアランスを０〜−０．２ｍｍにすることもできる。
また、前記各実施形態に係る通信ケーブルにおいて、４本の絶縁線芯２から形成される星型カッドの中心に円形、矩形等の形をした介在物４を挿入することもできる。さらに、前記介在物４の表面における長手方向に凸凹を形成し、又は、この介在物４の硬度を変更することもできる。図７は、介在物４を挿入した通信ケーブルの断面図である。
【００２７】
また、前記第２の実施形態に係る通信ケーブルにおいて、絶縁線芯２の表面における長手方向に凸凹を成形したが、凸凹の代わりに切れ目をいれる構成とすることもできる。
また、前記第４の実施形態に係る通信ケーブルにおいて、絶縁線芯２ａと２ｂとの外径を異ならせているが、絶縁線芯２ａと２ｂとの外径を同じにし、絶縁線芯２ａと２ｂとの硬度のみを異ならせることもできる。
【００２８】
【発明の効果】
以上のように本発明においては、４本の絶縁線芯の撚りピッチを小さくして、熱可塑性樹脂からなる外部被覆を前記４本の絶縁線芯が形成する星形カッド状の溝に狭入させているので、外力が働いてもカッド崩れが防止されて漏話の発生の防止維持をすることができるという効果を奏する。また、４芯でかつ星型カッド状に形成されているので、外径が小さくなり、通常のＬＡＮ用通信ケーブルと比べると、屈曲性が高く取り回しし易く、表面が滑らかで、束容積・重量が共に小さく持ち運びや保管に便利であるという効果を奏する。
【００２９】
また、本発明においては、４本の各絶縁線芯の表面における長手方向に凸凹を形成しているので、４本の各絶縁線芯の表面における凸凹が互いに係合して外力が働いてもカッド崩れが防止されて著しく漏話の発生の防止維持をすることができるという効果を有する。
また、本発明においては、前記４本の絶縁線芯の長手方向表面の面粗度を粗くしているので、各絶縁線芯相互の摩擦力が働き、外力が働いてもカッド崩れが防止されて漏話の発生の防止維持をすることができるという効果を有する。
【００３０】
また、本発明においては、前記４本の絶縁線芯の対角方向に位置する２本の外径を他の２本の外径より小さくしているので、２本の外径が大きい絶縁線芯が配置されることで形成される２つの溝に２本の外径が小さい各絶縁線芯が嵌り外力が働いてもカッド崩れが防止されて漏話の発生の防止維持をすることができるという効果を有する。
また、本発明においては、前記４本の絶縁線芯の対角方向に位置する２本の硬度を他の２本の硬度より小さくしているので、２本の硬度が小さい絶縁線芯が配置されることで形成される２つの溝に対して２本の硬度が大きい各絶縁線芯が各溝に埋入して外力が働いてもカッド崩れが防止されて漏話の発生の防止維持をすることができるという効果を有する。
また、本発明においては、前記４本の絶縁線芯を融着、接着又は粘着するので、外力が働いても抵抗力が生じてカッド崩れが防止されて漏話の発生の防止維持をすることができるという効果を有する。
【図面の簡単な説明】
【図１】本発明の第１の実施形態に係る通信ケーブルの断面図である。
【図２】本発明の第２の実施形態に係る通信ケーブルの断面図である。
【図３】本発明の第２の実施形態に係る通信ケーブルにおける絶縁線芯の斜視図である。
【図４】本発明の第３の実施形態に係る通信ケーブルの断面図である。
【図５】本発明の第４の実施形態に係る通信ケーブルの断面図である。
【図６】本発明のその他の実施形態に係る通信ケーブルにおける絶縁線芯の斜視図である。
【図７】本発明のその他の実施形態に係る通信ケーブルの断面図である。
【符号の説明】
２、２ａ、２ｂ絶縁線芯
２１導体
２２絶縁体
３外部被覆
４介在物
２０ａ、２０ｂ溝部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a communication cable used for transmission between LANs, and more particularly to a communication cable in which four insulated wire cores are twisted into a star quad.
[0002]
[Prior art]
Conventionally, an 8-core twisted pair cable has been used as a communication cable for a LAN or a high-speed interface. The twisted pair cable is formed by twisting two insulated wire cores into a pair. It is configured to be accommodated in an outer coating made of plastic material such as polyvinyl chloride in a state where four sets are assembled, and two of the four sets are used for transmission / reception, mainly for high-speed data transmission as described above used. In addition, the star-shaped quad cable has a configuration in which four insulated wire cores are twisted in a star-shaped quad shape and accommodated in an outer sheath made of a plastic material such as polyvinyl chloride, and is mainly used as a local cable. .
[0003]
[Problems to be solved by the invention]
In the conventional communication cable, the twisted pair cable has a small crosstalk, but has a problem that it is difficult to secure a line space because of the four pairs of structures, and the star quad cable is a twisted pair cable. Although the outer diameter can be made smaller than that, there is a problem that crosstalk increases when quad collapse occurs due to bending or external stress.
[0004]
The present invention has been made in order to solve the above-described problems, and an object of the present invention is to propose a communication cable that can be easily handled and installed by reducing the storage volume, and prevents the occurrence of crosstalk and prevents crosstalk. .
[0005]
[Means for Solving the Problems]
The communication cable according to the present invention is formed by combining four insulated wire cores having an outer diameter of 0.2 to 0.8 mm with insulation coating and twisting them in a star quad shape with a twist pitch of 10 to 20 mm. In addition, an outer coating made of a thermoplastic resin is applied to the outside of the four insulated wire cores so as to fit into the star-shaped quad grooves formed by the four insulated wire cores. As described above, in the present invention, the twist pitch of the four insulated wire cores is reduced, and the outer coating made of the thermoplastic resin is narrowly inserted into the star-shaped quad groove formed by the four insulated wire cores. Therefore, even if an external force is applied, the collapse of the quad is prevented and the occurrence of crosstalk can be prevented and maintained. In addition, because it has a four-core and star-shaped quad shape, the outer diameter is extremely small. Compared to ordinary LAN cables, it is highly flexible and easy to handle. Easy wiring, smooth surface, small bundle volume and weight, convenient for carrying and storage.
[0006]
Moreover, the communication cable which concerns on this invention forms unevenness in the longitudinal direction in the surface of each insulated wire core as needed. As described above, in the present invention, since the unevenness is formed in the longitudinal direction on the surface of each of the four insulated wire cores, the unevenness on the surface of each of the four insulated wire cores is engaged with each other, and an external force is applied. Also, the collapse of the quad is prevented, and the occurrence of crosstalk can be significantly prevented and maintained.
Moreover, the communication cable which concerns on this invention roughens the surface roughness of the surface of the longitudinal direction of each insulated wire core as needed. As described above, in the present invention, since the surface roughness of the longitudinal surface of the four insulated wire cores is increased, the frictional force between the insulated wire cores works, and even if an external force is applied, the quad collapse is prevented. Thus, it is possible to prevent and maintain the occurrence of crosstalk.
[0007]
In addition, the communication cable according to the present invention is formed by changing the outer diameters of two of the four insulated wire cores located in the diagonal direction and the other two as necessary. As described above, in the present invention, the two outer diameters positioned in the diagonal direction of the four insulated wire cores are made smaller than the other two outer diameters. Even if two insulated wire cores having small outer diameters are fitted in two grooves formed by arranging the wire cores and an external force is applied, the quad collapse is prevented and the occurrence of crosstalk can be prevented and maintained. .
[0008]
In addition, the communication cable according to the present invention is formed by differentiating the hardness of two of the four insulated wire cores located in the diagonal direction and the other two as required. As described above, in the present invention, since the two hardnesses positioned in the diagonal direction of the four insulated wire cores are smaller than the other two hardnesses, the two insulated wire cores having a small hardness are provided. Even if two insulation wires with high hardness are embedded in each groove and the external force is applied to the two grooves formed by the arrangement, the quad collapse is prevented and the occurrence of crosstalk is prevented and maintained. can do.
Further, the communication cable according to the present invention fuses, bonds or adheres the four insulated wire cores as necessary. As described above, in the present invention, the four insulated wire cores are fused, bonded, or adhered, so that even if an external force is applied, resistance is generated and the quad collapse is prevented to prevent the occurrence of crosstalk. Can do.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment of the present invention)
Hereinafter, a communication cable according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a sectional view of a communication cable according to this embodiment.
[0010]
In FIG. 1, the communication cable according to the present embodiment includes an insulated wire core 2 (for example, an outer diameter) made of a conductor 21 formed of soft copper (for example, a diameter of 0.5 mm) and an insulator 22 formed of polyethylene or the like. 0.8 mm) is twisted into a star-shaped quad shape with a twist pitch of 15 mm, and the four insulated wire cores 2 are formed with an outer covering 3 formed of an insulating material such as vinyl chloride. It is the composition of covering.
The outer covering 3 is configured to be narrowly inserted into a star-shaped quad groove formed from the four insulated wire cores 2 using a wire extruder die (not shown).
[0011]
Next, the forming operation of the communication cable according to the present embodiment will be described. The insulated wire core 2 is prepared by preheating the annealed copper conductor 21 at a temperature of about 80 to 100 ° C., and then using a screw extruder (not shown) having a die for an electric wire extruder. It is manufactured by heating and kneading and coating the preheated conductor 21 from a die for an electric wire extruder at a temperature of about 180 to 250 ° C. and a coating speed of 800 m / min to 2000 m / min.
The communication cable is manufactured by twisting the four insulated wire cores 2 into a star-shaped quad-shaped communication cable. This twisting is performed in order to balance the electrostatic coupling and electromagnetic coupling between the insulated wire cores 2 forming a pair. The twist pitch is set to 15 mm, and in order to reduce crosstalk between the insulated wire cores 2, This is performed by collecting four insulated wire cores 2 together. At this time, since the twist pitch is as short as 15 mm, the mutual position and the twist pitch due to the twist of the insulated wire core 2 are fixed without fluctuation.
A communication cable is formed by narrowing an outer covering 3 made of a thermoplastic resin such as polyvinyl chloride into a star-shaped quad-shaped groove formed by four insulated wire cores 2.
[0012]
As described above, according to the communication cable according to the present embodiment, the four insulated wire cores 2 form the outer coating 3 made of thermoplastic resin by reducing the twist pitch of the four insulated wire cores 2. Since the star-shaped groove is narrowly inserted, even if an external force is applied, the quad collapse is prevented and the occurrence of crosstalk can be prevented and maintained. In addition, because it has a four-core and star-shaped quad shape, its outer diameter is smaller, and it is more flexible and easier to handle than ordinary LAN communication cables. Easy wiring, smooth surface, small bundle volume and weight, convenient for carrying and storage.
[0013]
(Second embodiment of the present invention)
Hereinafter, a communication cable according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a cross-sectional view of the communication cable according to the present embodiment, and FIG. 3 is a perspective view of the insulated wire core 2 in the communication cable according to the present embodiment.
[0014]
In FIG. 2, the communication cable according to the present embodiment is formed into a star-shaped quad by assembling four insulated wire cores 2 composed of the conductor 21 and the insulator 22 in the same manner as the communication cable according to the first embodiment. The four insulated wire cores 2 that are twisted together are covered with an outer coating 3, and in addition to this structure, the surface of the insulator 22 of each of the insulated wire cores 2 is uneven in the longitudinal direction (for example, 0 .01-0.1 mm groove) is formed.
The unevenness in each of the pair of insulated wire cores 2 is formed without maintaining the shape of a star-shaped quad without interfering with the uniformity of capacitance between the insulated wire cores 2 and the decrease in electromagnetic coupling, and without increasing crosstalk. To do.
[0015]
Next, the forming operation of the communication cable according to the present embodiment will be described. The insulated wire core 2 is a screw extrusion having a wire extruder die formed by preheating an annealed copper conductor 21 to a temperature of about 80 to 100 ° C., and then forming an uneven shape in the longitudinal direction of the material to be extruded next. The polyethylene resin composition is heated and kneaded using a machine and coated on the preheated conductor 21 from the die for the wire extruder at a temperature of about 180 to 250 ° C. and a coating speed of 800 m / min to 2000 m / min. It is manufactured by. FIG. 3 shows a perspective view of the insulated wire core 2 manufactured as described above.
Thereafter, it is formed in the same manner as the communication cable of the first embodiment.
As described above, according to the communication cable according to the present embodiment, since the surface of each of the four insulated wire cores 2 is formed to be uneven in the longitudinal direction, the surface of each of the four insulated wire cores 2 is uneven. Even if they are engaged with each other and an external force is applied, the collapse of the quad is prevented and the occurrence of crosstalk can be remarkably prevented and maintained.
[0016]
(Third embodiment of the present invention)
Hereinafter, a communication cable according to a first embodiment of the present invention will be described with reference to FIG. FIG. 4 shows a cross-sectional view of the communication cable according to the present embodiment.
In FIG. 4, the communication cable according to the present embodiment includes four insulated wire cores 2 each made up of a conductor 21 and an insulator 22 and twisted into a star-shaped quad, and the four insulated wire cores 2 twisted together. In addition to this configuration, the outer diameter of the two insulated wire cores 2a (for example, the outer diameter is 0.5 to 0.8 mm) located in the diagonal direction is covered with other insulation. It is the structure made smaller than the two outer diameters of the wire core 2b (for example, outer diameter is 0.75-1.2 mm).
The size of the outer diameter of each of the two insulated wire cores 2 is such that the shape of a star-shaped quad is maintained, so that the uniformity of capacitance between the insulated wire cores 2 and the decrease in electromagnetic coupling are not hindered, and crosstalk is prevented. Mold without increasing the size.
[0017]
Next, the forming operation of the communication cable according to the present embodiment will be described. In manufacturing the insulated wire core 2, the annealed copper conductor 21 is preheated to a temperature of about 80 to 100 ° C. in advance. Next, two types of wire extruder dies for extrusion molding so that the radii are different for each of the two insulated wire cores 2 positioned in the diagonal direction are prepared. The insulation wire core 2 is extruded using an attached screw extruder. More specifically, the preheated conductor 21 is coated with the polyethylene resin composition heated and kneaded at a temperature of about 180 to 250 ° C. and a coating speed of 800 m / min to 2000 m / min. Thus, two types of insulated wire cores 2a and 2b having different radii are manufactured.
[0018]
In the communication cable, the two insulated wire cores 2b are arranged in a diagonal direction, and the insulated wire cores 2a are arranged in two grooves 20a and 20b formed by the two insulated wire cores 2b. It is manufactured by twisting into a star-shaped quad in the state of being allowed to stand. This twisting is performed in order to balance the electrostatic coupling and electromagnetic coupling between the pair of insulated wire cores 2a and 2b. The twist pitch is set to 15 mm, and the crosstalk between the insulated wire cores 2a and 2b is reduced. In order to reduce it, four insulated wire cores 2a and 2b are assembled. At that time, since the twist pitch is as short as 15 mm, the mutual position and twist pitch due to twisting of the insulated wire cores 2a and 2b are fixed without fluctuation.
A communication cable is formed by narrowing an outer sheath 3 made of a thermoplastic resin such as polyvinyl chloride into a star-shaped quad groove formed by four insulated wire cores 2a and 2b.
[0019]
As described above, according to the communication cable according to the present embodiment, the outer diameters of the two insulated wire cores 2a located in the diagonal direction are smaller than the two outer diameters of the other insulated wire cores 2b. The two insulated wire cores 2a are fitted in the groove portions 20a and 20b with respect to the two groove portions 20a and 20b formed by the two insulated wire cores 2b. Can be prevented and maintained.
[0020]
(Fourth embodiment of the present invention)
Hereinafter, a communication cable according to a first embodiment of the present invention will be described with reference to FIG. FIG. 5 shows a cross-sectional view of a communication cable according to the present embodiment.
In the communication cable according to the present embodiment in FIG. 5, the four insulated wire cores 2 composed of the conductors 21 and the insulators 22 are gathered and twisted into a star-shaped quad shape, and the four insulated wire cores 2 that are twisted together. In addition to this configuration, the outer diameters of the two insulated wire cores 2a located in the diagonal direction are made smaller than the two outer diameters of the other insulated wire cores 2b, so that the insulation is provided. In this configuration, the hardness of the wire core 2a (for example, the hardness is 58 to 65) is made larger than the two hardnesses (for example, the hardness is 44 to 54) of the insulated wire core 2b.
The insulation wire cores 2a and 2b have a hardness and an outer diameter that maintain the shape of the star-shaped quad, so that the uniformity of the capacitance between the insulation wire cores 2 and the decrease in electromagnetic coupling are not hindered, and crosstalk is prevented. Mold without increasing the size.
[0021]
Next, the forming operation of the communication cable according to the present embodiment will be described. In manufacturing the insulated wire core 2, the annealed copper conductor 21 is preheated to a temperature of about 80 to 100 ° C. in advance. Next, two types of wire extruder dies for extrusion molding so that the radii are different for each of the two insulated wire cores 2 positioned in the diagonal direction are prepared. The insulated wire core 2 is extruded by using two attached screw extruders. More specifically, two polyethylene resin compositions are used so that the hardness after curing is different on the preheated conductor 21 at a temperature of about 180 to 250 ° C. and a coating speed of 800 m / min to 2000 m / min. Two types of insulated wire cores 2a and 2b having different radii and hardness are manufactured by covering with a die for an electric wire extruder of each screw extruder that encloses an object.
[0022]
In the communication cable, the two insulated wire cores 2b are arranged in a diagonal direction, and the respective insulated wire cores 2a are embedded in the two grooves 20a and 20b formed by the two insulated wire cores 2b. It is manufactured by twisting it into a star-shaped quad in the state of entering. This twisting is performed in order to balance the electrostatic coupling and electromagnetic coupling between the pair of insulated wire cores 2a and 2b. The twist pitch is set to 15 mm, and the crosstalk between the insulated wire cores 2a and 2b is reduced. In order to reduce it, four insulated wire cores 2a and 2b are assembled. At that time, since the twist pitch is as short as 15 mm, the mutual position and twist pitch due to twisting of the insulated wire cores 2a and 2b are fixed without fluctuation.
A communication cable is formed by narrowing an outer sheath 3 made of a thermoplastic resin such as polyvinyl chloride into a star-shaped quad groove formed by four insulated wire cores 2a and 2b.
[0023]
As described above, according to the communication cable according to the present embodiment, the outer diameters of the two insulated wire cores 2a located in the diagonal direction are made smaller than the two outer diameters of the other insulated wire cores 2b, and the diagonal is obtained. Since the hardness of the two insulated wire cores 2a positioned in the direction is larger than the two hardnesses of the other insulated wire cores 2b, the two insulated wire cores 2b formed by arranging the two insulated wire cores 2b Two insulated wire cores 2a are embedded in each groove with respect to the groove portions 20a and 20b, and even if an external force is applied, the collapse of the quad is prevented and the occurrence of crosstalk can be prevented and maintained.
[0024]
(Other embodiments)
In addition, in the communication cable which concerns on each said embodiment, when extruding the insulated wire core 2 from the die | dye for electric wire extruders, by changing the resin composition to which the coating speed fluctuation | variation or heating kneading | mixing, The roughness of the surface (for example, the surface roughness is 0.03 to 0.12 μm) can be changed, and the frictional force between the four insulated wire cores 2 is increased so that even if an external force is applied, the quad collapses. Can be prevented and the occurrence of crosstalk can be prevented and maintained. FIG. 6 is a perspective view of the insulated wire core 2 with the roughness changed.
[0025]
Further, in the communication cable according to each of the above embodiments, the outer periphery of the communication cable is partially made of paper, woven cloth or the like before being covered with the outer coating 3 made of thermoplastic resin such as polyvinyl chloride. It can also be wound with tape.
In addition, in the communication cable according to each of the above embodiments, before the four insulated wire cores 2 are twisted, the four insulated wire cores 2 may be heated to about 200 ° C. and fused in a star-shaped quad shape. it can.
In the communication cable according to each of the above embodiments, the four insulated wire cores 2 can be bonded in a star quad shape with an adhesive before the four insulated wire cores 2 are twisted together.
[0026]
Moreover, in the communication cable according to each of the above embodiments, the insulator 22 can be formed by kneading polyethylene and an adhesive, and the insulated wire core 2 made of the insulator 22 can have adhesiveness.
In the communication cable according to each of the above embodiments, the clearance between the outer sheath 3 and the star quad formed from the four insulated wire cores 2 can be set to 0 to −0.2 mm.
In addition, in the communication cable according to each of the embodiments, the inclusion 4 having a circular shape, a rectangular shape, or the like can be inserted into the center of the star-shaped quad formed from the four insulated wire cores 2. Furthermore, unevenness can be formed in the longitudinal direction on the surface of the inclusion 4 or the hardness of the inclusion 4 can be changed. FIG. 7 is a cross-sectional view of the communication cable with the inclusion 4 inserted therein.
[0027]
Moreover, in the communication cable which concerns on the said 2nd Embodiment, although the unevenness | corrugation was shape | molded in the longitudinal direction in the surface of the insulated wire core 2, it can also be set as the structure which can make a cut instead of an unevenness | corrugation.
Further, in the communication cable according to the fourth embodiment, the insulated wire cores 2a and 2b have different outer diameters, but the insulated wire cores 2a and 2b have the same outer diameter, and the insulated wire cores 2a and 2b Only the hardness of 2b can be varied.
[0028]
【The invention's effect】
As described above, in the present invention, the twist pitch of the four insulated wire cores is reduced, and the outer coating made of thermoplastic resin is narrowly inserted into the star-shaped quad groove formed by the four insulated wire cores. Therefore, even if an external force is applied, the quad collapse is prevented, and it is possible to prevent and maintain the occurrence of crosstalk. In addition, because it has a 4-core and star-shaped quad shape, it has a smaller outer diameter, and is more flexible and easier to handle than ordinary LAN communication cables, has a smooth surface, and has a bundle volume and weight. Both are small and convenient to carry and store.
[0029]
Further, in the present invention, since the unevenness is formed in the longitudinal direction on the surface of each of the four insulated wire cores, even if the unevenness on the surface of each of the four insulated wire cores is engaged with each other, an external force is applied. The collapse of the quad is prevented, and it is possible to significantly prevent and maintain the occurrence of crosstalk.
Further, in the present invention, since the surface roughness of the longitudinal surface of the four insulated wire cores is increased, the frictional force between the insulated wire cores works, and even if an external force is applied, the quad collapse is prevented. Thus, it is possible to prevent and maintain the occurrence of crosstalk.
[0030]
Further, in the present invention, the two outer diameters positioned in the diagonal direction of the four insulated wire cores are made smaller than the other two outer diameters, so that the two insulated wires having a larger outer diameter are used. Even if two insulated wire cores with small outer diameters are fitted in the two grooves formed by the arrangement of the cores and an external force is applied, the quad collapse is prevented and the occurrence of crosstalk can be prevented and maintained. Has an effect.
Further, in the present invention, the two hardnesses positioned in the diagonal direction of the four insulated wire cores are made smaller than the other two hardnesses, so that two insulated wire cores having a small hardness are arranged. As a result, even if two insulated wires having high hardness are embedded in each groove and an external force is applied to the two grooves formed, the quad collapse is prevented and the occurrence of crosstalk is prevented and maintained. It has the effect of being able to.
In the present invention, since the four insulated wire cores are fused, bonded or adhered, even if an external force is applied, resistance is generated and the quad collapse is prevented, thereby preventing the occurrence of crosstalk. It has the effect of being able to.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a communication cable according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of a communication cable according to a second embodiment of the present invention.
FIG. 3 is a perspective view of an insulated wire core in a communication cable according to a second embodiment of the present invention.
FIG. 4 is a cross-sectional view of a communication cable according to a third embodiment of the present invention.
FIG. 5 is a cross-sectional view of a communication cable according to a fourth embodiment of the present invention.
FIG. 6 is a perspective view of an insulated wire core in a communication cable according to another embodiment of the present invention.
FIG. 7 is a cross-sectional view of a communication cable according to another embodiment of the present invention.
[Explanation of symbols]
2, 2a, 2b Insulated wire core 21 Conductor 22 Insulator 3 Outer coating 4 Inclusions 20a, 20b Groove

Claims

A combination of four insulated wire cores coated with a conductor having an outer diameter of 0.2 to 0.8 mm, twisted into a star-shaped quad with a twist pitch of 6 to 20 mm, and the four twisted insulated wire cores A communication cable, characterized in that an outer coating made of a thermoplastic resin is provided on the outside so as to be inserted into the star-shaped quad groove formed by the four insulated wire cores.

The communication cable according to claim 1,
A communication cable characterized by forming irregularities in the longitudinal direction on the surface of each insulated wire core.

In the communication cable according to claim 1 or 2,
A communication cable characterized by roughening the surface roughness of the longitudinal surface of each insulated wire core.

The communication cable according to any one of claims 1 to 3,
2. A communication cable, wherein two of the four insulated wire cores located in a diagonal direction and the other two are formed with different outer diameters.

The communication cable according to any one of claims 1 to 4,
A communication cable, wherein the two insulated wire cores positioned in the diagonal direction and the other two are formed with different hardnesses.

The communication cable according to any one of claims 1 to 5,
A communication cable characterized in that the four insulated wire cores are fused, bonded or adhered.