JP4270489B2

JP4270489B2 - Connection structure between flexible high-frequency coaxial cable and coaxial connector

Info

Publication number: JP4270489B2
Application number: JP2002358797A
Authority: JP
Inventors: 重広笹井; 富男渡辺
Original assignee: Totoku Electric Co Ltd
Current assignee: Totoku Electric Co Ltd
Priority date: 2002-12-11
Filing date: 2002-12-11
Publication date: 2009-06-03
Anticipated expiration: 2022-12-11
Also published as: JP2004192926A

Description

【０００１】
【発明の属する技術分野】
本発明は、６５ＧＨｚを越える帯域まで使用可能なフレキシブル高周波同軸ケーブルと同軸型コネクタとの接続構造に関するものである。
【０００２】
【従来の技術】
光通信を含む情報通信機器類及び産業機器類の機内外配線材、機器リード線として用いられるケーブル類、例えばフレキシブル高周波同軸ケーブルは、これら機器類の性能及び機能の向上に伴って種々の特性が要求されている。特に高周波伝送技術の進展と共に同軸ケーブルアセンブリの適用周波数は数ＧＨｚから数十ＧＨｚの帯域に及び、さらに広帯域化しつつある。また、上記フレキシブル高周波同軸ケーブルと同軸型コネクタとを接続した構造（同軸コネクタアセンブリ）に於いても数十ＧＨｚの帯域に適合するものが求められている。
従来、フレキシブル高周波同軸ケーブルと同軸型コネクタとの接続構造においては、例えば図７（ａ）、（ｂ）、（ｃ）、（ｄ）（特許文献１参照）に示すもの、図８（特許文献２参照）に示すもの、或は図９（特許文献３参照）に示すもの等が知られている。
図７は、従来例に係る同軸ケーブルとプラグタイプの同軸型コネクタとの接続構造の要部を示す縦断面図で、同図（ａ）はその第1例、同図（ｂ）はその第２例、同図（ｃ）はその第３例、また同図（ｄ）はその第４例である。図８は、従来例に係る同軸ケーブルとプラグタイプの同軸型コネクタとの接続構造の第５例を説明するための略図で、同図（ａ）は接続構造の縦断面図、同図（ｂ）は接続先端部を設けた同軸ケーブルの斜視図、また同図（ｃ）はシェルの斜視図である。また図９は、従来例に係る同軸ケーブルとプラグタイプの同軸型コネクタとの接続構造の第６例を説明するための略図で、同図（ａ）は接続構造の縦断面図、同図（ｂ）は接続先端部を設けた同軸ケーブルの斜視図、また同図（ｃ）、（ｄ）は、それぞれシェルの側面図と平面図である。
先ず上記図７（ａ）に示す構造（従来第１例）は、同軸ケーブルとプラグタイプの同軸型コネクタとの接続構造の要部であって、ケーブル端面から突出している中心導体１、この外周に設けられた絶縁体２、前記絶縁体２を囲む筒状の金属製外部導体３’、およびケーブル端部で外部導体を覆う筒状シェル１１とからなり、前記外部導体３’とシェル１１は半田２０で固着されている。そして、前記シェル１１の先端部は内側に向かってフランジfが延設され、該フランジfの内壁に同軸ケーブルの外部導体３’の先端面が突き当てられた構造となっている。
また上記図７（ｂ）に示す構造（従来第２例）は、上述した図７（ａ）の構造に対して、シェル１１がフランジを有しない単なる筒状に形成されていて、絶縁体２と外部導体３’とシェル１１の各先端面が面一となっている接続構造である。
また上記図７（ｃ）に示す構造（従来第３例）は、上述した図７（ｂ）の構造に対して、シェル１１の一端部を絶縁体２および外部導体３’面から突出させて空隙nを設けた接続構造である。
また上記図７（ｄ）に示す構造（従来第４例）は、上述した図７（ｃ）の構造の空隙n部を先広がりにした接続構造である。
また図８に示す構造（従来第５例）は、同図（ｃ）に示すように、ケーブル外径に合わせたシェル１１に半田付け用の穴２２を設け、同図（ｂ）に示すように、フレキシブル高周波同軸ケーブル２１より端部のシース９を剥離し、更に編組８、金属箔６および絶縁体２を同一面で切断して中心導体１を突出させて接続先端部とし、次いで該接続先端部をシェル１１に挿入し、半田付け用の穴２２より半田付けすることにより接続した、プラグタイプの同軸型コネクタの接続構造である（同図（ａ））。なお、同図（ａ）において、１５はカップリングナット、１６はガスケット、１７はリティニングリング、また２３は熱収縮チューブである。
また図９に示す構造（従来第６例）は、上述した図８の構造に対して、同図（ｂ）に示すようにフレキシブル高周波同軸ケーブル２１の接続先端部を順次編組８、金属箔６、および中心導体１に段階的に剥離し、これを金属箔６と編組８とが個別に半田付け可能なＤカットされた半田付け溝２４を有するシェル１１（同図（ｃ）に側面図、（ｄ）に平面図を示す）に半田付けすることにより接続し、プラグタイプの同軸型コネクタ本体に装着（同図（ａ））した接続構造である。なお、前記半田付け溝２４は、ケーブルの金属箔６および編組８より成る外部導体の形状に沿うようテーパーを有する。
【０００３】
【特許文献１】
特開平６−１７６８２５号公報
【特許文献２】
米国特許第４，６８８，８７６号公報
【特許文献３】
特開平７−１４６４５号公報
【０００４】
【発明が解決しようとする課題】
しかしながら、上述の従来接続構造においては、次のような欠点があった。すなわち図７（ａ）に示す接続構造（従来第１例）では、外部導体３’の先端面gをシェル１１のフランジf内壁に突き当てて半田付けを行った際に、外部導体３’とシェル１１の間隙に半田２０が充填されシェル１１の先端部（フランジf内壁）まで流れ込んで行くのであるが、この先端部の間隙に存在する空気の抜け孔が無いために、半田２０がシェル１１の先端部まで到達しにくい。つまりは半田回りが悪く、伝送特性面や機械的特性面で問題があった。
また図７（ｂ）に示す接続構造（従来第２例）では、外部導体３’とシェル１１の先端面が面一であるので半田回りは良いが逆に半田が外部に流出してしまい、相手側の同軸型コネクタを接続した場合に嵌合面に不規則なエアギャップが生じ、電気的接続が不安定になり、伝送特性面で問題があった。
また図７（ｃ）に示す接続構造（従来第３例）では、シェル１１の一端部を絶縁体2および外部導体３’面から突出させて空隙nを設けたことにより、前記問題点の改善を試みているが、これは根本的な解決ではない。つまり、半田２０はシェル１１の内壁を伝いまれに嵌合面まで流出する。また、シェル１１の一端部を突出させて出来た空隙n内に半田が流出すると、空隙部の容量分が増大し特性インピーダンスのミスマッチが生じ反射特性が劣化する。なお、この反射特性の劣化は、４０ＧＨｚを越える超高周波領域で特に顕著になる。
また図７（ｄ）に示す接続構造（従来第４例）では、上記図７（ｃ）に示す接続構造の空隙n部が先広がりに形状変更されているだけであり、根本的な解決ではない。
また図８に示す接続構造（従来第５例）では、半田付け用の穴２２から半田２０を充填した際に、ケーブルの接続先端部は金属箔６と編組８とが一体となっているため、金属箔６の部分には半田の回りが悪いという欠点を有していた。また、外部から半田付け状態を確認することが困難で、半田付け不良による特性インピーダンスの劣化が生じる問題があった。
また図９に示す接続構造（従来第６例）では、ケーブルの接続先端部を、順次編組８、金属箔６および中心導体１に段階的に剥離するのであるが、金属箔６巻き付け部を露出させると、金属箔の巻きが緩み加工性（シェルへのケーブル挿入）が悪化するという欠点を有していた（金属箔が螺旋巻きされているケーブルは巻き終わり側の端末が緩み、また金属箔が縦添えされているケーブルは両端末が緩む）。なお、金属箔６と編組８との間に緩衝用の樹脂層が介在されている場合（図示せず）は、この樹脂層を剥離することが困難である。また、Ｄカットされた半田付け溝２４を有するシェル１１を用いても、半田の充填には熟練技術を要することは言うまでもない。
つまり、図７〜９に示す従来からのフレキシブル高周波同軸ケーブルと同軸型コネクタとの接続構造は、すべて半田接続がベースになっているが、この方式は電気的特性の再現性という観点で種々の問題点が存在した。またコネクタ接続部のケーブルの耐屈曲性については十分には配慮されていなかった。また、自然環境に対する配慮の面からも、含鉛半田の使用は近年敬遠される傾向にある。
【０００５】
本発明は、上記従来技術が有する各種問題点を解決するためになされたものであり、フレキシブル高周波同軸ケーブルと同軸型コネクタとの接続構造として、半田接続に起因する不具合点を解消し、６５ＧＨｚを越える帯域まで使用可能で、優れた伝送特性を有し、またコネクタ接続部のケーブルの耐屈曲性能が格段に向上したフレキシブル高周波同軸ケーブルと同軸型コネクタとの接続構造を提供することを目的とする。
【０００６】
【課題を解決するための手段】
第１の観点として本発明は、中心導体の外周に順次、絶縁体、金属箔の螺旋巻きにより形成した内側の外部導体、編組により形成した外側の外部導体、前記内側外部導体と外側外部導体の間に介在させた緩衝用の樹脂テープ、およびシースからなるフレキシブル高周波同軸ケーブルと、金属製シェルを備えた同軸型コネクタとの接続構造であって、
前記フレキシブル高周波同軸ケーブルの先端部を、シースが剥離されて露出した外側外部導体と、この外側外部導体下の内側外部導体と、前記内側外部導体と外側外部導体の間に介在させた緩衝用の樹脂テープとが錫コート（鉛フリー半田）または半田コート（鉛入り半田）により一体化された一体化外部導体が先端部の絶縁体の外周に形成された一体化外部導体形成先端部とし、該一体化外部導体形成先端部の先端は中心導体及び絶縁体が順次露出するよう段差加工され、また一体化外部導体形成先端部の残部の一体化外部導体の外周表面は螺旋状凹凸加工が施されて段差・螺旋状凹凸加工接続先端部とされ、また螺旋状凹凸加工外周表面のみに接着剤が塗布され、先端部が内側に向かって延設されたフランジを有し且つ内面に螺旋状凹凸加工が施された金属製シェルの該フランジ内壁に、前記段差・螺旋状凹凸加工接続先端部の一体化外部導体の先端面が突き当たり圧着されるまで回転挿入され、フランジ内壁と一体化外部導体先端面の突き当たり圧着部を電気的接続部とし、前記塗布された接着剤が硬化され、前記段差・螺旋状凹凸加工接続先端部および金属製シェルが機械的に固着され、電気的に接続されたフレキシブル高周波同軸ケーブル装着金属製シェル体とし、同軸型コネクタ本体に装着した事を特徴とするフレキシブル高周波同軸ケーブルと同軸型コネクタとの接続構造にある。
上記絶縁体としては、多孔質フッ素系樹脂が好ましく用いられる。また前記一体化外部導体の外周表面の螺旋状凹凸加工は、例えばGroove DiceによるSpiral Groove加工、すなわち、専用ねじ切りダイスを用いた粗雄ねじ加工を用いることができる。また前記接着剤は一体化外部導体の先端面（フランジの内壁に突き当てる面）には塗布しないものとする。
上記第１観点の接続構造では、フレキシブル高周波同軸ケーブルと同軸型コネクタとを接続する際、従来からの半田接続方式ではなく、螺旋状凹凸接合と接着剤を併用し、金属製シェルのフランジ内壁に一体化外部導体先端面を突き当て、一体化外部導体および金属製シェルを機械的に固着させ電気的に接続した方式であるので、従来のような半田接続に起因する問題点が生じることはない。つまり、半田が金属製シェルの先端部まで到達せず、伝送特性や機械的特性が悪くなることはない。また、半田が金属製シェルの嵌合面まで流出してしまい、相手側の同軸型コネクタを接続した場合に不規則なエアギャップが生じ、電気的接続が不安定になり、伝送特性が悪くなることはない。さらに、金属製シェルの一端部を突出させて出来た空隙内に半田が流出し、空気絶縁体部の容量分が増大したり、あるいは絶縁体が半田付け時の高温により熱変質したりして特性インピーダンスのミスマッチが生じ反射特性が劣化することはない。更に、フレキシブル高周波同軸ケーブルの接続先端部の内側金属箔と外側編組の外部導体は錫コートまたは半田コートにより一体化されているため、金属箔と編組とを段階的に剥離する必要が無く、金属箔の巻きが緩み加工性が悪化することがない。当然、外部から半田付け状態を確認する必要はなく、また金属箔と編組との間に介在された緩衝用の樹脂テープを特別に処理する必要もない。
要するに、本発明の接続方式は、半田を取り扱う特殊な熟練技術を要しなくとも電気的特性の再現性が得られ、また錫コートの場合は、鉛フリーとなり環境に配慮した優れた接続構造と言える。
【０００７】
第２の観点として本発明は、中心導体の外周に順次、絶縁体、金属箔の螺旋巻きにより形成した内側の外部導体、編組により形成した外側の外部導体、前記内側外部導体と外側外部導体の間に介在させた緩衝用の樹脂テープ、およびシースからなるフレキシブル高周波同軸ケーブルと、金属製シェルを備えた同軸型コネクタとの接続構造であって、
前記フレキシブル高周波同軸ケーブルの先端部を、シースが剥離されて露出した外側外部導体と、この外側外部導体下の内側外部導体と、前記内側外部導体と外側外部導体の間に介在させた緩衝用の樹脂テープとが錫コート（鉛フリー半田）または半田コート（鉛入り半田）により一体化された一体化外部導体が先端部の絶縁体の外周に形成された一体化外部導体形成先端部とし、該一体化外部導体形成先端部の先端は中心導体及び絶縁体が順次露出するよう段差加工され、また一体化外部導体形成先端部の残部の一体化外部導体の外周表面は未加工のままで段差加工接続先端部とし、また未加工の一体化外部導体の外周表面のみに接着剤が塗布され、先端部が内側に向かって延設されたフランジを有し且つ内面に突起を備え、フランジに向かって先細りとなる穴を有する金属製シェルを用い、フランジ内壁に前記段差加工接続先端部の一体化外部導体の先端面が突き当たるまで圧入され、フランジ内壁と一体化外部導体先端面の突き当たり圧着部を電気的接続部とし、前記塗布された接着剤が硬化され、前記段差加工接続先端部および金属製シェルが機械的に固着され、電気的に接続されたフレキシブル高周波同軸ケーブル装着金属製シェル体とし、同軸型コネクタ本体に装着した事を特徴とするフレキシブル高周波同軸ケーブルと同軸型コネクタとの接続構造にある。
上記第２観点の接続構造では、上記第１観点の接続構造と同様の作用・効果を奏する。
【０００８】
第３の観点として本発明は、前記段差加工接続先端部の一体化外部導体の外周表面には、金属製シェル内面の突起に対応する受けを設けたことを特徴とするフレキシブル高周波同軸ケーブルと同軸型コネクタとの接続構造にある。
上記第３観点の接続構造では、一体化外部導体の外周表面に金属製シェル内面の突起に対応する受けを設けたので、一体化外部導体と金属製シェルとの機械的固着および電気的接続がより良好となる。
【０００９】
第４の観点として本発明は、前記同軸型コネクタ本体が、プラグタイプの同軸型コネクタ本体、中心コンタクト繋ぎ替えジャックタイプの同軸型コネクタ本体、または中心コンタクト繋ぎ替えプラグタイプの同軸型コネクタ本体であり、これらのコネクタ本体に前記フレキシブル高周波同軸ケーブル装着金属製シェル体が挿入され、金属製クランプにて締め付け固定されていることを特徴とする上記第１〜３観点記載のフレキシブル高周波同軸ケーブルと同軸型コネクタとの接続構造にある。
上記第４観点の接続構造では、前記同軸型コネクタ本体として、プラグタイプの同軸型コネクタ本体、中心コンタクト繋ぎ替えジャックタイプの同軸型コネクタ本体、または中心コンタクト繋ぎ替えプラグタイプの同軸型コネクタ本体を用い、これらのコネクタ本体に前記フレキシブル高周波同軸ケーブル装着金属製シェル体を挿入し、金属製クランプにて締め付け固定することにより優れた電気的特性を有し、且つ多彩なシリーズ化が可能な接続構造とすることができる。
【００１０】
第５の観点として本発明は、上記第４観点記載の接続構造において、前記金属製クランプは後方にフレキシブル高周波同軸ケーブル保護機能を有する保護パイプ部を備え、保護パイプ部の後方端内面には、フレキシブル高周波同軸ケーブルの最小曲げ径を考慮したテーパー部が設けられ、また前記保護パイプ部とこれに隣接するフレキシブル高周波同軸ケーブルとの段差箇所には、耐屈曲性能を考慮し、双方に跨る１枚以上の熱収縮チューブが段階的に装着されていることを特徴とするフレキシブル高周波同軸ケーブルと同軸型コネクタとの接続構造にある。
上記第５観点の接続構造では、金属製クランプ後方に設けられた保護パイプ部と、保護パイプ部の後方端内面に設けられたテーパー部と、保護パイプ部とフレキシブル高周波同軸ケーブルとの段差箇所に段階的に装着された熱収縮チューブとの相乗効果により、同軸型コネクタ接続部のフレキシブル高周波同軸ケーブルの耐屈曲性能が格段に向上する。
【００１１】
第６の観点として本発明は、上記第４観点記載の接続構造において、前記金属製クランプは後方にフレキシブル高周波同軸ケーブルの最小曲げ径を規制できる金属製あるいは樹脂製のアーマー（保護外装）がフレキシブル高周波同軸ケーブルの全面ないし部分的に装着され、またアーマー表面とフレキシブル高周波同軸ケーブルとの段差箇所には、必要に応じ１枚以上の熱収縮チューブが装着されていることを特徴とするフレキシブル高周波同軸ケーブルと同軸型コネクタとの接続構造にある。
上記第６観点の接続構造では、前記保護パイプ部の代わりにアーマーをフレキシブル高周波同軸ケーブルの全面ないし部分的に装着し、必要に応じその上に１枚以上の熱収縮チューブを装着することで、同軸型コネクタ接続部のフレキシブル高周波同軸ケーブルの耐屈曲特性が格段に向上する。
【００１２】
【発明の実施の形態】
以下、本発明の内容を、図に示す実施の形態により更に詳細に説明する。なお、これにより本発明が限定されるものではない。
図１は、本発明に係る接続構造の実施例１において、フレキシブル高周波同軸ケーブルおよび接続先端部を説明するための略図であり、左方部は段差・螺旋状凹凸加工接続先端部の構成、また右方部はフレキシブル高周波同軸ケーブルの構成を示す。図２は、本発明に係る接続構造の実施例１において、段差・螺旋状凹凸加工接続先端部を設けたフレキシブル高周波同軸ケーブルを金属製シェルに装着した状態（フレキシブル高周波同軸ケーブル装着金属製シェル体）を示す要部縦断面図である（金属製クランプも示す）。図３は、本発明に係る接続構造の実施例１において、フレキシブル高周波同軸ケーブルとプラグタイプの同軸型コネクタとの接続構造（熱収縮チューブなし）を示す要部縦断面図である。図４は、本発明に係る接続構造の実施例２において、フレキシブル高周波同軸ケーブルとプラグタイプの同軸型コネクタとの接続構造（熱収縮チューブあり）を示す要部縦断面図である。図５は、本発明に係る接続構造の実施例３において、実施例１に示す接続構造のフレキシブル高周波同軸ケーブル装着金属製シェル体と中心コンタクト繋ぎ替えジャックタイプの同軸型コネクタとの接続構造を示す要部縦断面図である。図６は、本発明に係る接続構造の実施例４において、実施例１に示す接続構造のフレキシブル高周波同軸ケーブル装着金属製シェル体と中心コンタクト繋ぎ替えプラグタイプの同軸型コネクタとの接続構造を示す要部縦断面図である。また図１０は、本発明に係る実施例１の接続構造（コネクタアセンブリ）(ａ)および比較品の接続構造（コネクタアセンブリ）（ｂ）の伝送特性チャートである。
【００１３】
これらの図において、１は中心導体、２は絶縁体、３は一体化外部導体（錫コートまたは半田コート）、４は螺旋状凹凸加工面、５は接着剤、６は金属箔の螺旋巻き外部導体（内側外部導体）、７は緩衝用の樹脂テープ、８は編組外部導体（外側外部導体）、９はシース、１０はフレキシブル高周波同軸ケーブル、１０ａは接続先端部（段差・螺旋状凹凸加工接続先端部、先端部）、１１は金属製シェル、１１ａはフレキシブル高周波同軸ケーブル装着金属製シェル体、１２は金属製クランプ、１３は保護パイプ部、１４はテーパー部、１５はカップリングナット、１６はガスケット、１７はリティニングリング、１８はプラグタイプの同軸型コネクタ本体、１８ａは本発明実施例１の接続構造（熱収縮チューブなし）、１８ｂは本発明実施例２の接続構造（熱収縮チューブあり）、２３（ａ）、２３（ｂ）、２３（ｃ）は熱収縮チューブ、２４はテーパー状半田付け溝、３０は本発明実施例３の接続構造（中心コンタクト繋ぎ替えジャックタイプの同軸型コネクタアセンブリ）、３１はジャックタイプ変換部を備えたジャックコネクタ本体、３２はジャックタイプ変換部、４０は本発明実施例４の接続構造（中心コンタクト繋ぎ替えプラグタイプの同軸型コネクタアセンブリ）、４１は中心コンタクト繋ぎ替え部を備えたプラグコネクタ本体、４２は中心コンタクト繋ぎ替え部、ｆはフランジ、ｇは一体化外部導体先端面、ｈは中心導体嵌合部、ｉは相手側中心コンタクト嵌合部、ｊはねじ山部、またｋは中心コンタクトピンである。
【００１４】
−第１の実施の形態（実施例１）−
本発明の接続構造の第１実施形態について図１〜３を用いて説明する。
本発明の接続構造に用いるフレキシブル高周波同軸ケーブル１０は、図１の右部に示すように、例えば銀メッキ銅被覆鋼線よりなる中心導体１の外周に順次、多孔質PTFE樹脂（四フッ化エチレン樹脂）よりなる絶縁体２、金属箔の螺旋巻きにより形成した内側の外部導体６、緩衝用の樹脂テープ７、編組により形成した外側の外部導体８およびシース９からなる。
先ず接続を行うにあたり、前記フレキシブル高周波同軸ケーブル１０の接続先端部を形成するため、先端部のシース９を剥離して外側外部導体８を露出した。次いで、内側外部導体６と、外側外部導体８と、内側外部導体６と外側外部導体８との間に介在された緩衝用樹脂テープ７とを錫コートにより一体化して一体化外部導体３とした。次いで、中心導体１および絶縁体２が順次露出するよう段差剥離し、一体化外部導体３表面には専用ねじ切りダイス（Groove Dice）を用いた粗雄ねじ加工（Spiral Groove加工）を施して螺旋状凹凸加工面４を設けて段差・螺旋状凹凸加工接続先端部１０ａとし、更に螺旋状凹凸加工面４には接着剤５を塗布した。前記接着剤５としては、エポキシ系接着剤、例えば、エポキシ・テクノロジー社（ビレリカ.マサチューセッツ）によって「EPO-TEK353ND」の商品名で市販されている非導電性２液型接着剤などが好ましい。なお、接着剤５は一体化外部導体３の先端面（フランジの内壁に突き当てる面）g付近には塗布しなかった。
【００１５】
続いて図２に示すように、先端部が内側に向かって延設されたフランジfを有し且つ内面に螺旋状凹凸加工がなされた金属製シェル１１に、前記接着剤が塗布された段差・螺旋状凹凸加工接続先端部１０ａを、前記フランジfの内壁に一体化外部導体３の先端面gが突き当たり圧着されるまで回転挿入し、フランジf内壁と先端面gの突き当たり圧着部を電気的接続部とした。続いて、塗布された接着剤５を70℃×60分の硬化条件で硬化し、前記段差・螺旋状凹凸加工接続先端部１０ａと金属製シェル１１を機械的に固着してフレキシブル高周波同軸ケーブル装着金属製シェル体１１ａとした。なお、前記フレキシブル高周波同軸ケーブル装着金属製シェル体１１ａのフレキシブル高周波同軸ケーブル１０には金属製クランプ１２を予め装着しておいた。
【００１６】
次いで、図３に示すように、フレキシブル高周波同軸ケーブル装着金属製シェル体１１ａは、カップリングナット１５、リティニングリング１７、ガスケット１６を備えたプラグタイプの同軸型コネクタ本体１８に挿入し、金属製クランプ１２にてきつく締め付け固定して接続構造１８ａを完成させた。なお、前記金属製クランプ１２は後方にフレキシブル高周波同軸ケーブル保護機能を有する保護パイプ部１３を備え、該保護パイプ部１３の後方端内面には、フレキシブル高周波同軸ケーブルの最小曲げ径を考慮したテーパー部１４が設けられている。
【００１７】
ここで、実施例１では銀メッキ銅被覆鋼線を中心導体１とし、多孔質PTFE樹脂を絶縁体２とするフレキシブル高周波同軸ケーブルを用いているが、これ以外の材質からなるフレキシブル高周波同軸ケーブルにも適用可能である。また、外部導体の金属箔６は螺旋巻き以外に縦添えでもよく、また緩衝用の樹脂テープ７が介在されないフレキシブル高周波同軸ケーブルにも適用できる。また、前記外側外部導体８と、内側外部導体６と外側外部導体８との間に介在された緩衝用樹脂テープ７の一体化には錫コートの替わりに従来通り半田コート（鉛入り半田）も適用できる。
なお、上記螺旋状凹凸接合のみでも金属製シェル１１先端部のフランジf内壁にフレキシブル高周波同軸ケーブルの外部導体先端面が圧着するため、良好な伝送特性は得られるが、機械的強度を確保する意味で接着剤は必要である。また上記エポキシ系接着剤「EPO-TEK353ND」の硬化条件は、70℃×60分の他150℃×1分、60℃×90分が選択可能である。むろん接着剤には「EPO-TEK 353ND」以外の、これと同等性能以上の機械的強度や耐環境性を有するエポキシ系接着剤（２液タイプの他、１液タイプや導電性タイプ）、その他の接着剤を用いても何ら問題はない。ただし、導電タイプは非導電タイプに比べ一般的に接着強度は劣るうえに、本発明の接着箇所は導電性能を必要としない。
【００１８】
−第２の実施の形態（実施例２）−
本発明の接続構造の第２実施形態について図４を用いて説明する。
上記第１実施形態で得られた接続構造に、保護パイプ部１３とこれに隣接するフレキシブル高周波同軸ケーブル１０の段差箇所には、耐屈曲特性を考慮し双方に跨る３枚の熱収縮チューブ２３ａ（１層目）、２３ｂ（２層目）、２３ｃ（３層目）を段階的に装着し、その他は上記第１実施形態と同様にして接続構造１８ｂを完成させた。上記熱収縮チューブとしては、例えば１層目に電子線架橋軟質ポリオレフィン樹脂のスミチューブ（住友電工社商品名）を用い、２、３層目にオレフィン系、ゴム系、塩ビ系、フッ素系の何れかを用いる。なお、ゴム系のものを用いると耐屈曲性能は増すが、被覆が厚くなる傾向にある。
【００１９】
−第３の実施の形態（実施例３）−
本発明の接続構造の第３実施形態について図５を用いて説明する。
本実施形態は、フレキシブル高周波同軸ケーブルと中心コンタクト繋ぎ替えジャックタイプの同軸型コネクタとの接続構造である。上述の第１実施形態のプラグタイプに対して中心コンタクト繋ぎ替えジャックタイプは、図２に示すフレキシブル高周波同軸ケーブル装着金属製シェル体１１ａを、片側に中心導体１の嵌合部hを備え、別の片側に相手側プラグコネクタの中心コンタクトの嵌合部iを有するジャックタイプ変換部３２をコネクタ本体中に備えたジャックコネクタ本体３１に挿入し、金属製クランプ１２にてきつく締め付け固定した構造である。そして、ジャックコネクタ本体３１の片端に施されたねじ山部jにより、相手側プラグコネクタのカップリングナット（図示せず）とねじ嵌合された中心コンタクト繋ぎ替えジャックタイプの接続構造３０である。なお前記金属製クランプ１２は前記実施形態１と同様のものを用いた。また上記ジャックタイプの接続構造３０は、接続先端部の加工方法や金属製シェルとの接続方法、金属製シェルの部材が実施例１，２のプラグタイプと共通化されている。
【００２０】
−第４の実施の形態（実施例４）−
本発明の接続構造の第４実施形態について図６を用いて説明する。
本実施形態は、フレキシブル高周波同軸ケーブルと中心コンタクト繋ぎ替えプラグタイプの同軸型コネクタとの接続構造である。上述の第１実施形態のプラグタイプに対して本プラグタイプは、図２に示すフレキシブル高周波同軸ケーブル装着金属製シェル体１１ａを、片側に中心導体１の嵌合孔hを備え、別の片側に中心コンタクトピンkを有する中心コンタクト繋ぎ替え部４２を備えたプラグコネクタ本体４１に挿入し、金属製クランプ１２にてきつく締め付け固定した中心コンタクト繋ぎ替えプラグタイプの接続構造４０である。なお、前記中心コンタクト繋ぎ替え部４２以外の構造は、前記実施形態１のプラグタイプの同軸型コネクタ本体１８と同様である。また上記中心コンタクト繋ぎ替えプラグタイプの接続構造４０は、接続先端部の加工方法や金属製シェルとの接続方法、金属製シェルおよび金属製クランプの各部材が実施例１〜３と共通化されている。
【００２１】
−その他の実施の形態（実施例）−
その他の実施形態として、特に図示はしないが、前記図２において、金属製シェル内面の螺旋状凹凸処理の代わりに突起を備えた穴を有する金属製シェルを用い、これに、末加工の一体化外部導体に接着剤を塗布した接続先端部を圧入して固着させ電気的に接続した螺旋状凹凸接合以外の接続方法が適用可能である。なお、一体化外部導体表面には、金属製シェル内面の突起に対応する受けを設けても良い。また、接着剤を塗布した接続先端部を金属製シェルの穴に挿入し、フランジの内壁に一体化外部導体先端面を突き当てた状態で、フレキシブル高周波同軸ケーブルと金属製シェルとを固定治具にて圧着させたり、金属製シェルの後端でフレキシブル高周波同軸ケーブル（一体化外部導体部）を補助的に半田で仮止めしたり、金属製シェルの後端をフレキシブル高周波同軸ケーブルの特性インピーダンスが劣化しない程度にカシメて固定しても良い。なお、接着剤は一体化外部導体の先端面（フランジの内壁に突き当てる面）には塗布しないものとする。また、金属製クランプは後方に保護パイプの代わりにフレキシブル高周波同軸ケーブルの最小曲げ径を規制できる金属製あるいは樹脂製のアーマー（保護外装、例えば可撓管、蛇腹等）を、フレキシブル高周波同軸ケーブルの全面ないし部分的に装着しても良い。また、アーマー表面とフレキシブル高周波同軸ケーブルとの段差箇所には、必要に応じ１枚以上の熱収縮チューブを装着しても良い。
【００２２】
−特性評価試験−
上記実施例１で得られた接続構造（図３）（コネクタアセンブリ）をベクトル・ネットワーク・アナライザのport１およびport２に接続し、挿入損失特性および反射特性の評価を行った。その結果を図１０（ａ）に示す。図から明らかなように、本発明のコネクタアセンブリはDC〜65GHzの広周波帯域において、挿入損失は小さく且つ安定しており、また反射特性は25dB以上を確保しており、優れた伝送特性を有していた。なお、比較のため、図１とほぼ同形状であるが、絶縁体２の長さを最適値に変更し、一体化外部導体３の外周表面が未加工のままの段差加工接続先端部をアンリツ社製Ｖ型コネクタ（V101Mの商品名で市販）に半田接続したコネクタアセンブリについても、同様に挿入損失特性および反射特性の評価を行ったが、伝送特性（反射特性）は本発明の接続構造より劣っていた。その結果を図１０（ｂ）に示す。
【００２３】
【発明の効果】
本発明による接続構造は、フレキシブル高周波同軸ケーブルと同軸型コネクタとを接続する際、螺旋状凹凸接合、またはその他の接合と接着剤とを併用した接続構造であるので、従来からの半田接続に起因する不具合点が解消された。またフレキシブル高周波同軸ケーブルの接続先端部の一体化外部導体は、錫コート若しくは半田コートにより金属箔と編組とが一体化されているため、加工工数が減り加工性および接続部の信頼性が向上した。つまり、本発明の半田レス接続方式によれば、半田を取り扱う特殊加工の技術を要しなくとも良好な電気的特性の再現性が得られ、特に錫コートの場合は、自然環境に配慮した優れた接続が実現できるようになった。また、金属製クランプ後方に設けられた保護パイプ部と、保護パイプ部の後方端内面に設けられたテーパー部と、保護パイプ部とフレキシブル高周波同軸ケーブルの段差箇所に装着された熱収縮チューブとの相乗効果により、同軸型コネクタ接続部のフレキシブル高周波同軸ケーブルの耐屈曲性能は格段に向上した。また、保護パイプ部の代わりに、フレキシブル高周波同軸ケーブル全体若しくは部分的にフレキシブル高周波同軸ケーブルの最小曲げ径を規制できるアーマーを装着し、必要に応じその上から熱収縮チューブを装着することで、耐屈曲性はさらに向上した。
以上説明したように本発明によれば、自然環境に配慮しつつも優れた接続構造およびフレキシブル性能を維持し、65GHzを越える帯域まで良好な電気的特性が確保できるようになった。従って、本発明は産業上に寄与する効果が極めて大である。
【図面の簡単な説明】
【図１】本発明に係る接続構造の実施例１において、フレキシブル高周波同軸ケーブルおよび接続先端部を説明するための略図であり、左方部は段差・螺旋状凹凸加工接続先端部の構成、また右方部はフレキシブル高周波同軸ケーブルの構成を示す。
【図２】本発明に係る接続構造の実施例１において、段差・螺旋状凹凸加工接続先端部を設けたフレキシブル高周波同軸ケーブルを金属製シェルに装着した状態（フレキシブル高周波同軸ケーブル装着金属製シェル体）を示す要部縦断面図である（金属製クランプも示す）。
【図３】本発明に係る接続構造の実施例１において、フレキシブル高周波同軸ケーブルとプラグタイプの同軸型コネクタとの接続構造（熱収縮チューブなし）を示す要部縦断面図である。
【図４】本発明に係る接続構造の実施例２において、フレキシブル高周波同軸ケーブルとプラグタイプの同軸型コネクタとの接続構造（熱収縮チューブあり）を示す要部縦断面図である。
【図５】本発明に係る接続構造の実施例３において、実施例１に示す接続構造のフレキシブル高周波同軸ケーブル装着金属製シェル体と中心コンタクト繋ぎ替えジャックタイプの同軸型コネクタとの接続構造を示す要部縦断面図である。
【図６】本発明に係る接続構造の実施例４において、実施例１に示す接続構造のフレキシブル高周波同軸ケーブル装着金属製シェル体と中心コンタクト繋ぎ替えプラグタイプの同軸型コネクタとの接続構造を示す要部縦断面図である。
【図７】従来例に係る同軸ケーブルとプラグタイプの同軸型コネクタとの接続構造の要部を示す縦断面図で、同図（ａ）はその第１例、同図（ｂ）はその第２例、同図（ｃ）はその第３例、また同図（ｄ）はその第４例である。
【図８】従来例に係る同軸ケーブルとプラグタイプの同軸型コネクタとの接続構造の第５例を説明するための略図で、同図（ａ）は接続構造の縦断面図、同図（ｂ）は接続先端部を設けた同軸ケーブルの斜視図、また同図（ｃ）はシェルの斜視図である。
【図９】従来例に係る同軸ケーブルとプラグタイプの同軸型コネクタとの接続構造の第６例を説明するための略図で、同図（ａ）は接続構造の縦断面図、同図（ｂ）は接続先端部を設けた同軸ケーブルの斜視図、また同図（ｃ）、（ｄ）は、それぞれシェルの側面図と平面図である。
【図１０】本発明に係る実施例１の接続構造（コネクタアセンブリ）（ａ）、および比較品の接続構造（コネクタアセンブリ）（ｂ）の伝送特性チャートである。
【符号の説明】
１中心導体
２絶縁体
３一体化外部導体（錫コートまたは半田コート）
３’外部導体
４螺旋状凹凸加工面
５接着剤
６金属箔の螺旋巻き外部導体（内側外部導体）
７緩衝用の樹脂テープ
８編組外部導体（外側外部導体）
９シース
１０フレキシブル高周波同軸ケーブル
１０ａ接続先端部（段差・螺旋状凹凸加工接続先端部、先端部）
１１金属製シェル
１１ａフレキシブル高周波同軸ケーブル装着金属製シェル体
１２金属製クランプ
１３保護パイプ部
１４テーパー部
１５カップリングナット
１６ガスケット
１７リティニングリング
１８プラグタイプの同軸型コネクタ本体
１８ａ本発明実施例１の接続構造（熱収縮チューブなし）
１８ｂ本発明実施例２の接続構造（熱収縮チューブあり）
２０半田
２１フレキシブル高周波同軸ケーブル
２２半田付け用穴
２３、２３（ａ）、２３（ｂ）、２３(ｃ) 熱収縮チューブ
２４テーパー状半田付け溝
３０本発明実施例３の接続構造（中心コンタクト繋ぎ替えジャックタイプの同軸型コネクタアセンブリ）
３１ジャックタイプ変換部を備えたジャックコネクタ本体
３２ジャックタイプ変換部
４０本発明実施例４の接続構造（中心コンタクト繋ぎ替えプラグタイプの同軸型コネクタアセンブリ）
４１中心コンタクト繋ぎ替え部を備えたプラグコネクタ本体
４２中心コンタクト繋ぎ替え部
ｆフランジ
ｇ一体化外部導体先端面
ｈ中心導体嵌合部
ｉ相手側中心コンタクト嵌合部
ｊねじ山部
ｋ中心コンタクトピン
ｎ空隙[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a connection structure between a flexible high-frequency coaxial cable that can be used up to a band exceeding 65 GHz and a coaxial connector.
[0002]
[Prior art]
  In-machine / external wiring materials for information communication equipment and industrial equipment including optical communications, cables used as equipment lead wires, for example, flexible high-frequency coaxial cables, have various characteristics as the performance and function of these equipment improve. It is requested. In particular, with the development of high-frequency transmission technology, the applicable frequency of the coaxial cable assembly is in the range of several GHz to several tens of GHz, and is becoming wider. Also, a structure (coaxial connector assembly) in which the flexible high-frequency coaxial cable and the coaxial connector are connected is required to be compatible with a band of several tens of GHz.
  Conventionally, in a connection structure between a flexible high-frequency coaxial cable and a coaxial connector, for example, those shown in FIGS. 7A, 7B, 7C, and 7D (see Patent Document 1), FIG. 8 (Patent Document) 2) or the one shown in FIG. 9 (see Patent Document 3) is known.
  FIG. 7 is a longitudinal sectional view showing the main part of a connection structure between a coaxial cable and a plug-type coaxial connector according to a conventional example. FIG. 7A is a first example thereof, and FIG. FIG. 2C shows the third example, and FIG. 4D shows the fourth example. FIG. 8 is a schematic diagram for explaining a fifth example of a connection structure between a coaxial cable and a plug-type coaxial connector according to a conventional example. FIG. 8A is a longitudinal sectional view of the connection structure, and FIG. ) Is a perspective view of a coaxial cable provided with a connecting tip, and FIG. 10C is a perspective view of a shell. FIG. 9 is a schematic diagram for explaining a sixth example of a connection structure between a coaxial cable and a plug-type coaxial connector according to a conventional example. FIG. 9 (a) is a longitudinal sectional view of the connection structure. (b) is a perspective view of a coaxial cable provided with a connecting tip, and (c) and (d) are a side view and a plan view of the shell, respectively.
  First, the structure shown in FIG. 7A (conventional first example) is a main part of a connection structure between a coaxial cable and a plug-type coaxial connector, and includes a central conductor 1 projecting from the end face of the cable, its outer periphery. An insulator 2, a cylindrical metal outer conductor 3 'surrounding the insulator 2, and a cylindrical shell 11 covering the outer conductor at the end of the cable. The outer conductor 3' and the shell 11 are It is fixed with solder 20. The tip of the shell 11 has a structure in which a flange f extends inward, and the tip of the outer conductor 3 ′ of the coaxial cable is abutted against the inner wall of the flange f.
  In addition, the structure shown in FIG. 7B (second example of the prior art) has a shell 11 formed in a simple cylindrical shape having no flange as compared with the structure shown in FIG. In this connection structure, the outer conductor 3 ′ and the tip end surfaces of the shell 11 are flush with each other.
  The structure shown in FIG. 7C (conventional third example) has one end of the shell 11 projecting from the surface of the insulator 2 and the outer conductor 3 ′ with respect to the structure of FIG. The connection structure is provided with a gap n.
  Further, the structure shown in FIG. 7D (conventional fourth example) is a connection structure in which the gap n of the structure shown in FIG.
  Further, in the structure shown in FIG. 8 (conventional fifth example), as shown in FIG. 8C, a soldering hole 22 is provided in the shell 11 matched to the outer diameter of the cable, as shown in FIG. Next, the sheath 9 at the end is peeled from the flexible high-frequency coaxial cable 21, and the braid 8, the metal foil 6 and the insulator 2 are cut on the same surface to project the central conductor 1 to form a connection tip, and then the connection This is a plug-type coaxial connector connection structure in which the distal end portion is inserted into the shell 11 and soldered through a soldering hole 22 (FIG. 1A). In FIG. 2A, 15 is a coupling nut, 16 is a gasket, 17 is a retaining ring, and 23 is a heat shrinkable tube.
  Further, the structure shown in FIG. 9 (sixth conventional example) is different from the structure of FIG. 8 described above in that the connecting tip of the flexible high-frequency coaxial cable 21 is sequentially braided 8 and the metal foil 6 as shown in FIG. , And a shell 11 having a D-cut soldering groove 24 to which the metal foil 6 and the braid 8 can be individually soldered (a side view in FIG. The connection structure is connected by soldering to (d) (shown in a plan view) and attached to a plug-type coaxial connector body ((a) in the same figure). The soldering groove 24 has a taper so as to follow the shape of the outer conductor made of the metal foil 6 and the braid 8 of the cable.
[0003]
[Patent Document 1]
          JP-A-6-176825
[Patent Document 2]
          U.S. Pat. No. 4,688,876
[Patent Document 3]
          Japanese Patent Laid-Open No. 7-14645
[0004]
[Problems to be solved by the invention]
  However, the conventional connection structure described above has the following drawbacks. That is, in the connection structure (first conventional example) shown in FIG. 7A, when the tip surface g of the outer conductor 3 ′ is abutted against the inner wall of the flange f of the shell 11 and soldered, The solder 20 is filled in the gap of the shell 11 and flows to the tip portion (inner wall of the flange f) of the shell 11. However, since there is no air hole in the gap of the tip portion, the solder 20 is It is difficult to reach the tip of the. In other words, soldering is poor and there are problems in terms of transmission characteristics and mechanical characteristics.
  Further, in the connection structure shown in FIG. 7B (conventional second example), the outer conductor 3 ′ and the tip end surface of the shell 11 are flush with each other, so the solder is good but the solder flows out to the outside. When the mating coaxial connector is connected, an irregular air gap occurs on the mating surface, the electrical connection becomes unstable, and there is a problem in transmission characteristics.
  Further, in the connection structure shown in FIG. 7C (third conventional example), the one end of the shell 11 is protruded from the surfaces of the insulator 2 and the outer conductor 3 ′ to provide the gap n, thereby improving the above problem. This is not a fundamental solution. That is, the solder 20 flows along the inner wall of the shell 11 and flows out to the fitting surface. Further, when the solder flows out into the gap n formed by projecting one end of the shell 11, the capacity of the gap increases, resulting in a mismatch of characteristic impedance and deterioration of the reflection characteristics. Note that the deterioration of the reflection characteristics is particularly noticeable in an ultrahigh frequency region exceeding 40 GHz.
  Moreover, in the connection structure shown in FIG. 7D (conventional fourth example), the gap n of the connection structure shown in FIG. Absent.
  In the connection structure shown in FIG. 8 (conventional fifth example), when the solder 20 is filled from the soldering hole 22, the metal foil 6 and the braid 8 are integrated at the connection tip of the cable. In addition, the metal foil 6 has a defect that soldering is poor. In addition, it is difficult to confirm the soldering state from the outside, and there is a problem that characteristic impedance is deteriorated due to poor soldering.
  Further, in the connection structure shown in FIG. 9 (sixth conventional example), the connection tip of the cable is peeled off step by step to the braid 8, the metal foil 6, and the central conductor 1, but the winding portion of the metal foil 6 is exposed. If it is done, the winding of the metal foil is loosened, and the workability (insertion of the cable into the shell) has deteriorated (the cable on which the metal foil is spirally wound has the end of the winding end loosened, and the metal foil Both ends of the cable with ”are loosened). In addition, when the buffering resin layer is interposed between the metal foil 6 and the braid 8 (not shown), it is difficult to peel off the resin layer. Further, it goes without saying that even if the shell 11 having the D-cut soldering groove 24 is used, skillful skill is required for filling the solder.
  That is, the conventional flexible high-frequency coaxial cable and the coaxial connector shown in FIGS. 7 to 9 are all based on solder connection, but this method is various in terms of reproducibility of electrical characteristics. There was a problem. Moreover, sufficient consideration has not been given to the bending resistance of the cable at the connector connecting portion. In view of consideration for the natural environment, the use of lead-containing solder tends to be avoided in recent years.
[0005]
  The present invention has been made to solve the various problems of the prior art described above, and as a connection structure between a flexible high-frequency coaxial cable and a coaxial connector, the problem caused by solder connection is eliminated, and 65 GHz is achieved. The purpose of the present invention is to provide a connection structure between a flexible high-frequency coaxial cable and a coaxial connector that can be used up to a band exceeding, has excellent transmission characteristics, and has greatly improved the bending resistance of the cable at the connector connection part. .
[0006]
[Means for Solving the Problems]
  As a first aspect, the present invention provides an outer conductor formed by braiding and an inner outer conductor formed by spiral winding of an insulator and a metal foil in order on the outer periphery of the central conductor.,in frontA connection structure between a resin tape for buffering interposed between the inner outer conductor and the outer outer conductor, a flexible high-frequency coaxial cable including a sheath, and a coaxial connector provided with a metal shell,
  SaidflexibleHigh frequency coaxial cableBeyondThe outer outer conductor exposed by peeling off the sheath, and the inner outer conductor under the outer outer conductor,in frontThe buffer resin tape interposed between the inner outer conductor and the outer outer conductor is integrated by tin coating (lead-free solder) or solder coating (lead-containing solder).OneExternalizationIntegrated outer conductor formation destination where the body is formed on the outer periphery of the insulator at the tipEnd andWhere the integrated outer conductor is formedEnd tipEndStepped so that the center conductor and insulator are sequentially exposed, andIntegrated outer conductor forming tipThe outer peripheral surface of the remaining integrated outer conductor is subjected to a spiral unevenness to form a step / spiral unevenness connection tip, and the outer surface of the spiral unevenness processingPlaneSteps and spiral irregularities are formed on the inner wall of a metal shell having a flange coated with an adhesive and having a tip extending inwardly and a spiral irregularity on the inner surface. Rotate and insert until the tip of the integrated outer conductor of the connecting tip is abutted and crimped.Integrated outer conductorThe pressure-bonding portion at the end of the tip surface is an electrical connection portion, the applied adhesive is cured, and the step / spiral uneven processing connection tip and the metal shell are mechanically fixed and electrically connected.Flexible high frequency coaxialCable installationmetallicIt has a connection structure between a flexible high-frequency coaxial cable and a coaxial connector, characterized in that the shell body is attached to the coaxial connector body.
  As the insulator, a porous fluororesin is preferably used. Further, the spiral concavo-convex processing on the outer peripheral surface of the integrated outer conductor can be performed by, for example, spiral groove processing using Groove Dice, that is, rough male screw processing using a dedicated thread cutting die. Further, the adhesive is not applied to the front end surface of the integrated outer conductor (the surface that abuts against the inner wall of the flange).
  In the connection structure according to the first aspect, when connecting the flexible high-frequency coaxial cable and the coaxial connector, instead of the conventional solder connection method, a spiral uneven joint and an adhesive are used in combination,metal MadeChezLeFlange inner wallOneAbut the outer surface of the integrated outer conductor,metallicSince the shell is mechanically fixed and electrically connected, there is no problem caused by conventional solder connection. In other words, solder ismetallicIt does not reach the tip of the shell, and transmission characteristics and mechanical characteristics do not deteriorate. Also, solder ismetallicWhen the mating coaxial connector is connected, an irregular air gap is generated when the mating coaxial connector is connected, the electrical connection becomes unstable, and the transmission characteristics do not deteriorate. further,metallicSolder flows out into the gap created by protruding one end of the shell, increasing the capacity of the air insulator, or the insulator is thermally altered due to the high temperature during soldering, causing mismatch in characteristic impedance Will not occur and the reflection characteristics will not deteriorate. Furthermore,Flexible high frequency coaxialThe inner metal foil at the connecting end of the cable and the outer conductor of the outer braid are integrated by a tin coat or solder coat, so there is no need to peel off the metal foil and the braid step by step, and the winding of the metal foil is loosened Workability does not deteriorate. Of course, it is not necessary to confirm the soldering state from the outside, and it is not necessary to specially treat the buffering resin tape interposed between the metal foil and the braid.
  In short, the connection method of the present invention provides reproducibility of electrical characteristics without requiring special skill in handling solder, and in the case of tin coating, it is lead-free and has an excellent connection structure that is environmentally friendly. I can say that.
[0007]
  As a second aspect, the present invention provides an outer conductor formed by braiding and an outer conductor formed by spiral winding of an insulator and a metal foil in order on the outer periphery of the central conductor.,in frontA connection structure between a resin tape for buffering interposed between the inner outer conductor and the outer outer conductor, a flexible high-frequency coaxial cable including a sheath, and a coaxial connector provided with a metal shell,
  SaidflexibleHigh frequency coaxial cableBeyondThe outer outer conductor exposed by peeling off the sheath, and the inner outer conductor under the outer outer conductor,in frontThe buffer resin tape interposed between the inner outer conductor and the outer outer conductor is integrated by tin coating (lead-free solder) or solder coating (lead-containing solder).OneExternalizationIntegrated outer conductor formation destination where the body is formed on the outer periphery of the insulator at the tipEnd andWhere the integrated outer conductor is formedEnd tipEndStepped so that the center conductor and insulator are sequentially exposed, andIntegrated outer conductor forming tipThe outer peripheral surface of the remaining integrated outer conductor is left unprocessed to form a stepped connection tip, and adhesive is applied only to the outer peripheral surface of the unprocessed integrated outer conductor, with the tip extending inward. And a protrusion on the inner surfaceTheTaper towards the lungeHoleAnd press-fitted until the front end surface of the integrated outer conductor of the stepped machining connection tip contacts the inner wall of the flange,Integrated outer conductorThe pressure-bonding portion at the end of the tip surface is an electrical connection portion, the applied adhesive is cured, and the step processing connection tip portion and the metal shell are mechanically fixed and electrically connected.Flexible high frequency coaxialCable installationmetallicIt has a connection structure between a flexible high-frequency coaxial cable and a coaxial connector, characterized in that the shell body is attached to the coaxial connector body.
  The connection structure according to the second aspect has the same operations and effects as the connection structure according to the first aspect.
[0008]
  As a third aspect, the present invention provides an outer peripheral surface of the integrated outer conductor of the stepped processing connection tip,metallicshellInsideIn this connection structure, a flexible high-frequency coaxial cable and a coaxial connector are provided.
  In the connection structure according to the third aspect, the outer peripheral surface of the integrated outer conductormetallicshellInsideSince the support corresponding to the protrusions is provided, mechanical fixation and electrical connection between the integrated outer conductor and the metal shell are improved.
[0009]
  As a fourth aspect of the present invention, the coaxial connector main body is a plug-type coaxial connector main body,Central contact transferIt is a jack type coaxial connector body or a central contact reconnecting plug type coaxial connector body.Flexible high frequency coaxialCable installationmetallicThe shell body is inserted and fastened and fixed by a metal clamp, and the flexible high-frequency coaxial cable and the coaxial connector according to the first to third aspects are provided.
  In the connection structure of the fourth aspect, as the coaxial connector body, a plug-type coaxial connector body,Central contact transferUse a jack-type coaxial connector body or a center-contact reconnecting plug-type coaxial connector body.Flexible high frequency coaxialCable installationmetallicBy inserting a shell body and tightening and fixing with a metal clamp, it is possible to obtain a connection structure that has excellent electrical characteristics and can be made into various series.
[0010]
  As a fifth aspect, the present invention provides the above4thIn the connection structure described in the viewpoint, the metal clamp is rearward.Flexible high frequency coaxialProvided with a protective pipe part with cable protection function, on the inner surface of the rear end of the protective pipe partFlexible high frequency coaxialA tapered portion is provided in consideration of the minimum bending diameter of the cable, and is adjacent to the protective pipe portion.Flexible high frequency coaxialConnection structure between flexible high-frequency coaxial cable and coaxial connector, where one or more heat-shrinkable tubes straddling both sides are installed stepwise at the step with the cable in consideration of bending resistance It is in.
  In the connection structure of the fifth aspect,metallicProvided behind the clampTahoProtective pipe and taper provided on the inner surface of the rear end of the protective pipePartAnd the protective pipeFlexible high frequency coaxialcaveWith LeDue to the synergistic effect with the heat-shrinkable tube installed stepwise at the stepped part,Coaxial typeConnector connectionFlexible high frequency coaxialThe bending resistance of the cable is greatly improved.
[0011]
  As a sixth aspect, the present invention provides the above4th viewIn the connection structure described in the dots, the metal clamp is located rearwardFlexible high frequency coaxialMetal or resin armor (protective armor) that can regulate the minimum bending diameter of the cableFlexible high frequency coaxialAttached to all or part of the cable and also armor tableSurface and flexible high-frequency coaxial caseMoveAndIn the connecting portion between the flexible high-frequency coaxial cable and the coaxial connector, one or more heat-shrinkable tubes are attached to the level difference portions as required.
  In the connection structure of the sixth aspect,AboveProtective pipePartArmor instead ofFlexible high frequency coaxialAttach one or more heat-shrinkable tubes on top of the cable, if necessary.Coaxial typeConnector connectionFlexible high frequency coaxialThe bending resistance of the cable is greatly improved.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, the contents of the present invention will be described in more detail with reference to embodiments shown in the drawings. Note that the present invention is not limited thereby.
  FIG. 1 is a schematic diagram for explaining a flexible high-frequency coaxial cable and a connection tip in Example 1 of a connection structure according to the present invention, and a left side is a configuration of a step / spiral uneven processing connection tip, The right part isFlexible high frequency coaxialThe cable configuration is shown. FIG. 2 shows a state in which a flexible high-frequency coaxial cable provided with a step / spiral concavo-convex processed connection tip is attached to a metal shell in the first embodiment of the connection structure according to the present invention.(Metal shell with flexible high-frequency coaxial cableIs a longitudinal sectional view of a main part showing a metal clamp (also showing a metal clamp). FIG. 3 is a longitudinal sectional view of a main part showing a connection structure (without a heat-shrinkable tube) between a flexible high-frequency coaxial cable and a plug-type coaxial connector in Example 1 of the connection structure according to the present invention. FIG. 4 is a longitudinal sectional view of a main part showing a connection structure (with a heat-shrinkable tube) between a flexible high-frequency coaxial cable and a plug-type coaxial connector in Example 2 of the connection structure according to the present invention. FIG. 5 shows a connection structure according to the third embodiment of the present invention.Flexible high frequency coaxialCable installationmetallicShell body andCentral contact transferIt is a principal part longitudinal cross-sectional view which shows the connection structure with a jack-type coaxial connector. FIG. 6 shows a connection structure according to the fourth embodiment of the connection structure according to the present invention.Flexible high frequency coaxialCable installationmetallicIt is a principal part longitudinal cross-sectional view which shows the connection structure of a shell body and a center contact connection plug type coaxial connector. FIG. 10 is a transmission characteristic chart of the connection structure (connector assembly) (a) and the comparative connection structure (connector assembly) (b) of Example 1 according to the present invention.
[0013]
  In these drawings, 1 is a central conductor, 2 is an insulator, 3 is an integrated outer conductor (tin coat or solder coat), 4 is a spiral uneven surface, 5 is an adhesive, and 6 is a spiral wound outside of a metal foil. Conductor (inner outer conductor), 7 is a resin tape for buffering, 8 is a braided outer conductor (outer outer conductor), 9 is a sheath, 10 is a flexible high-frequency coaxial cableLe,10a is a connection tip (step / spiral uneven connection tip, Tip), 11 is a metal shell, 11aIs a metal shell with a flexible high-frequency coaxial cable, 12 are metal clamps, 13HahoProtective pipe portion, 14 is a tapered portion, 15 is a coupling nut, 16 is a gasket, 17 is a retaining ring, 18 is a plug-type coaxial connector body, 18a is a connection structure according to the first embodiment of the present invention (no heat shrinkable tube) ), 18b is the connection structure of the second embodiment of the present invention (with a heat shrinkable tube), 23 (a), 23 (b), 23 (c) are heat shrinkable tubes, 24 is a tapered soldering groove, and 30 is the present invention. Connection structure of Example 3 (Central contact transferJack type coaxial connector assembly), 31 is a jack connector main body provided with a jack type conversion section, 32 is a jack type conversion section, and 40 is a connection structure of the fourth embodiment of the present invention (center contact switching plug type coaxial connector). Assembly), 41 is a plug connector body provided with a center contact switching part, 42 is a center contact switching part, f is a flange, g is an integrated outer conductor tip, h is a center conductor fitting part, and i is a mating side. The center contact fitting portion, j is a thread portion, and k is a center contact pin.
[0014]
  -First Embodiment (Example 1)-
  1st Embodiment of the connection structure of this invention is described using FIGS.
  As shown in the right part of FIG. 1, the flexible high-frequency coaxial cable 10 used in the connection structure of the present invention is sequentially formed with a porous PTFE resin (ethylene tetrafluoride) on the outer periphery of a central conductor 1 made of, for example, silver-plated copper-coated steel wire. Resin), an inner outer conductor 6 formed by spiral winding of metal foil, a buffering resin tape 7, an outer outer conductor 8 formed by braiding, and a sheath 9.
  In making the connection first,Flexible high frequencyIn order to form the connection tip of the coaxial cable 10,TipThe sheath 9 was peeled off to expose the outer outer conductor 8. Next, the inner outer conductor 6, the outer outer conductor 8, and the buffer resin tape 7 interposed between the inner outer conductor 6 and the outer outer conductor 8 are integrated with a tin coat to form an integrated outer conductor 3. . Next, the step is peeled off so that the central conductor 1 and the insulator 2 are sequentially exposed, and the surface of the integrated outer conductor 3 is subjected to rough male thread processing (Spiral Groove processing) using a dedicated thread cutting die (Groove Dice) to form spiral irregularities A processing surface 4 is provided to form a step / spiral uneven surface connection tip 10a, and further, a spiral uneven surface4Applied the adhesive 5. The adhesive 5 is preferably an epoxy adhesive, for example, a non-conductive two-component adhesive marketed under the trade name “EPO-TEK353ND” by Epoxy Technology (Billerica, Massachusetts). Note that the adhesive 5 was not applied to the vicinity of the front end surface (the surface abutting against the inner wall of the flange) g of the integrated outer conductor 3.
[0015]
  Subsequently, as shown in FIG. 2, a level difference in which the adhesive is applied to a metal shell 11 having a flange f with an end portion extending inward and a spiral concavo-convex surface formed on the inner surface. The spiral concavo-convex machining connection tip 10a is rotated and inserted into the inner wall of the flange f until the tip surface g of the integrated outer conductor 3 comes into contact with and crimped to electrically connect the crimping part between the flange f inner wall and the tip surface g. The part. Subsequently, the applied adhesive 5 is cured under curing conditions of 70 ° C. × 60 minutes,Steps and spiral irregularitiesThe processing connection tip 10a and the metal shell 11 are mechanically fixed.Metal shell with flexible high-frequency coaxial cable11a. BeforeMetal shell with flexible high-frequency coaxial cable11aFlexible high frequency coaxialcaveLe 1In 0, a metal clamp 12 was mounted in advance.
[0016]
  Then, as shown in FIG.Flexible high frequency coaxialCable installationmetallicThe shell body 11a includes a coupling nut 15, a retaining ring 17, and a gasket 16.Plug type coaxial typeIt was inserted into the connector body 18 and tightly fixed to the metal clamp 12 to complete the connection structure 18a. In addition, the abovemetallicClamp 12 in the rearFlexible high frequency coaxialA protection pipe portion 13 having a cable protection function is provided, and an inner surface of the rear end of the protection pipe portion 13Flexible high frequency coaxialA tapered portion 14 is provided in consideration of the minimum bending diameter of the cable.
[0017]
  Here, in Example 1, the silver-plated copper-coated steel wire is the central conductor 1 and the porous PTFE resin is the insulator 2.Flexible high frequency coaxialCable is used, but made of other materialsFlexible high frequency coaxialIt can also be applied to cables. Further, the metal foil 6 of the outer conductor may be vertically attached in addition to the spiral winding, and no buffer resin tape 7 is interposed.Flexible high frequency coaxialIt can also be applied to cables. AlsoThe buffer resin tape 7 interposed between the outer outer conductor 8 and the inner outer conductor 6 and the outer outer conductor 8.For the integration, a solder coat (leaded solder) can be applied as usual instead of the tin coat.
  It should be noted that only the above-mentioned spiral concavo-convex jointmetallicOn the inner wall of the flange f at the tip of the shell 11Flexible high frequency coaxialSince the front end surface of the outer conductor of the cable is crimped, good transmission characteristics can be obtained, but an adhesive is necessary to ensure mechanical strength. The curing conditions for the epoxy adhesive “EPO-TEK353ND” can be selected from 70 ° C. × 60 minutes, 150 ° C. × 1 minute, and 60 ° C. × 90 minutes. Of course, for adhesives other than “EPO-TEK 353ND”, epoxy adhesives with mechanical strength and environmental resistance equal to or better than this (two-component type, one-component type and conductive type), and others There is no problem even if this adhesive is used. However, the conductive type is generally inferior in adhesive strength to the non-conductive type, and the bonded portion of the present invention does not require conductive performance.
[0018]
  -Second Embodiment (Example 2)-
  A second embodiment of the connection structure of the present invention will be described with reference to FIG.
  The connection structure obtained in the first embodiment is adjacent to the protective pipe portion 13 and this.Flexible high frequency coaxialcaveLe 1In consideration of bending resistance, three heat-shrinkable tubes 23a (first layer), 23b (second layer), and 23c (third layer) are attached in stages to the step portion of 0, and others. Completed the connection structure 18b in the same manner as in the first embodiment. As the heat-shrinkable tube, for example, an electron beam cross-linked soft polyolefin resin Sumitube (trade name of Sumitomo Electric Industries) is used for the first layer, and any of olefin-based, rubber-based, vinyl chloride-based, and fluorine-based layers for the second and third layers. Is used. When rubber-based materials are used, the bending resistance increases, but the coating tends to be thick.
[0019]
  -Third Embodiment (Example 3)-
  A third embodiment of the connection structure of the present invention will be described with reference to FIG.
  This embodiment includes a flexible high-frequency coaxial cable andCentral contact transferThis is a connection structure with a jack-type coaxial connector. For the plug type of the first embodiment described aboveCentral contact transferThe jack type is shown in Fig. 2.Flexible high frequency coaxialCable installationmetallicA jack connector having a shell body 11a having a fitting portion h of the center conductor 1 on one side and a jack type conversion portion 32 having a fitting portion i of the center contact of the mating plug connector on the other side. The structure is inserted into the main body 31 and tightly fixed to the metal clamp 12. And it was screwed with the coupling nut (not shown) of the other party plug connector by the thread part j given to one end of jack connector main part 31.Central contact reconnecting jack typeConnection structure 30. The metal clamp 12 was the same as that of the first embodiment. The jack-type connection structure 30 is,ContactExamples of the processing method of the connecting tip part, the method of connecting to the metal shell, and the member of the metal shell are the first and second embodiments.NoCommon with rug type.
[0020]
  -Fourth Embodiment (Example 4)-
  A fourth embodiment of the connection structure of the present invention will be described with reference to FIG.
  This embodiment is a connection structure between a flexible high-frequency coaxial cable and a central contact reconnecting plug type coaxial connector. This plug type is shown in FIG. 2 with respect to the plug type of the first embodiment described above.Flexible high frequency coaxialCable installationmetallicThe shell body 11a is provided with a center contact switching portion 42 having a fitting hole h of the center conductor 1 on one side and a center contact pin k on another side.plugInserted into the connector body 41 and tightened and fixed to the metal clamp 12Center contact reconnecting plug typeThis is a connection structure 40. The structure other than the central contact switching part 42 is the same as that of the first embodiment.Plug type coaxial typeThis is the same as the connector body 18. In addition, the above-mentioned center contact switching plug type connection structure 40 is,ContactThe processing method of a connection tip part, the connection method with metal shells, each member of metal shells and metal clamps are made common with Examples 1-3.
[0021]
  -Other Embodiments (Examples)-
  As another embodiment, although not particularly illustrated, in FIG.metallicProtrusions are provided instead of the spiral irregularities on the shell inner surfaceHoleUsing a metal shell with an adhesive, apply an adhesive to the finished external conductorContactA connection method other than the spiral concavo-convex joint in which the connecting tip portion is press-fitted and fixed to be electrically connected is applicable. In addition,oneOn the surface of the external conductor,metallicA receptacle corresponding to the protrusion on the inner surface of the shell may be provided. Also, in the state where the connecting tip with the adhesive applied is inserted into the hole in the metal shell and the integrated outer conductor tip is abutted against the inner wall of the flange,Flexible high frequency coaxialWith cablemetallicCrimp the shell with a fixing jig,metallicAt the rear end of the shellFlexible high frequency coaxialTemporarily fix the cable (integrated outer conductor) with solder,metallicThe rear end of the shellFlexible high frequency coaxialIt may be fixed by caulking so that the characteristic impedance of the cable does not deteriorate. It should be noted that the adhesive is not applied to the tip surface of the integrated outer conductor (the surface that abuts against the inner wall of the flange). Also,metallicInstead of a protective pipe on the backFlexible high frequency coaxialMetal or resin armor that can regulate the minimum bending diameter of the cable (protective armor, eg flexible tube, bellows, etc.)Flexible high frequency coaxialIt may be attached to the entire surface or a part of the cable. Also armor tableSurface and flexible high-frequency coaxial caseMoveAndOne or more heat-shrinkable tubes may be attached to the step portions as required.
[0022]
  -Characterization test-
  The connection structure (FIG. 3) (connector assembly) obtained in Example 1 was connected to port 1 and port 2 of the vector network analyzer, and the insertion loss characteristic and reflection characteristic were evaluated. The result is shown in FIG. As is apparent from the figure, the connector assembly of the present invention has a small and stable insertion loss and a reflection characteristic of 25 dB or more in the wide frequency band of DC to 65 GHz, and has excellent transmission characteristics. Was. For comparison, the length of the insulator 2 is changed to an optimum value, which is substantially the same shape as that of FIG. The connector assembly soldered to a V-shaped connector (commercially available under the trade name V101M) was similarly evaluated for insertion loss characteristics and reflection characteristics. However, the transmission characteristics (reflection characteristics) were compared to the connection structure of the present invention. It was inferior. The result is shown in FIG.
[0023]
【The invention's effect】
  The connection structure according to the present invention comprises:Flexible high frequency coaxialWith cableCoaxial typeWhen connecting to the connector, a connection structure using a spiral concave-convex joint or other joints and an adhesive is used, which eliminates the problems caused by conventional solder connections. AlsoFlexible high frequency coaxialAt the connection tip of the cableIntegrationSince the outer conductor has the metal foil and the braid integrated by the tin coating or the solder coating, the number of processing steps is reduced, and the workability and the reliability of the connection portion are improved. In other words, according to the solderless connection method of the present invention, good reproducibility of electrical characteristics can be obtained without requiring special processing techniques for handling solder, and particularly in the case of a tin coat, it is excellent in consideration of the natural environment. Connection can be realized. Also,metallicProvided behind the clampTahoProtective pipe and taper provided on the inner surface of the rear end of the protective pipePartAnd the protective pipeFlexible high frequency coaxialcaveLeDue to the synergistic effect with the heat-shrinkable tube installed at the level difference,Coaxial typeConnector connectionFlexible high frequency coaxialThe bending resistance of the cable has been greatly improved. Also, KeepProtective pipePartInstead of,Flexible high frequency coaxialWhole or part of the cableFlexible high frequency coaxialBy installing an armor that can control the minimum bending diameter of the cable, and by installing a heat-shrinkable tube on top of it, the bending resistance was further improved.
  As described above, according to the present invention, an excellent connection structure and flexible performance can be maintained while considering the natural environment, and good electrical characteristics can be secured up to a band exceeding 65 GHz. Therefore, the present invention has an extremely large effect contributing to the industry.
[Brief description of the drawings]
FIG. 1 is a schematic diagram for explaining a flexible high-frequency coaxial cable and a connection tip in Example 1 of a connection structure according to the present invention, and a left side is a configuration of a connection tip of a step / spiral uneven processing; The right part isFlexible high frequency coaxialThe cable configuration is shown.
FIG. 2 shows a state in which a flexible high-frequency coaxial cable provided with a step / spiral concavo-convex processed connection tip is attached to a metal shell in the first embodiment of the connection structure according to the present invention.(Metal shell with flexible high-frequency coaxial cableIs a longitudinal sectional view of a main part showing a metal clamp (also showing a metal clamp).
FIG. 3 is a longitudinal sectional view of a main part showing a connection structure (without a heat-shrinkable tube) between a flexible high-frequency coaxial cable and a plug-type coaxial connector in Example 1 of the connection structure according to the present invention.
FIG. 4 is a longitudinal sectional view of an essential part showing a connection structure (with a heat-shrinkable tube) between a flexible high-frequency coaxial cable and a plug-type coaxial connector in Embodiment 2 of the connection structure according to the present invention.
FIG. 5 shows a third embodiment of the connection structure according to the present invention.Flexible high frequency coaxialCable installationmetallicShell body andCentral contact transferIt is a principal part longitudinal cross-sectional view which shows the connection structure with a jack-type coaxial connector.
6 shows a connection structure according to the fourth embodiment of the present invention.Flexible high frequency coaxialCable installationmetallicIt is a principal part longitudinal cross-sectional view which shows the connection structure of a shell body and a center contact connection plug type coaxial connector.
FIGS. 7A and 7B are longitudinal sectional views showing a main part of a connection structure between a coaxial cable and a plug-type coaxial connector according to a conventional example. FIG. 7A is a first example thereof, and FIG. FIG. 2C shows the third example, and FIG. 4D shows the fourth example.
FIG. 8 is a schematic diagram for explaining a fifth example of a connection structure between a coaxial cable and a plug-type coaxial connector according to a conventional example. FIG. 8 (a) is a longitudinal sectional view of the connection structure, and FIG. ) Is a perspective view of a coaxial cable provided with a connecting tip, and FIG. 10C is a perspective view of a shell.
FIG. 9 is a schematic diagram for explaining a sixth example of a connection structure between a coaxial cable and a plug-type coaxial connector according to a conventional example. FIG. 9 (a) is a longitudinal sectional view of the connection structure, and FIG. ) Is a perspective view of a coaxial cable provided with a connecting tip, and FIGS. 4C and 4D are a side view and a plan view of the shell, respectively.
FIG. 10 is a transmission characteristic chart of the connection structure (connector assembly) (a) of Example 1 according to the present invention and the connection structure (connector assembly) (b) of a comparative product.
[Explanation of symbols]
  1 Center conductor
  2 Insulator
  3 Integrated outer conductor (tin coat or solder coat)
  3 'outer conductor
  4 Helical uneven surface
  5 Adhesive
  6 Metal foil spiral wound outer conductor (inner outer conductor)
  7 Resin tape for cushioning
  8 Braided outer conductor (outer outer conductor)
  9 sheath
10 Flexible high-frequency coaxial cable
10a Connection tip (step / spiral uneven connection tip, Tip)
11 Metal shell
11aMetal shell body with flexible high-frequency coaxial cable
12 Metal clamp
13ProtectionProtection pipe section
14 Taper part
15 Coupling nut
16 Gasket
17 retaining ring
18 Plug-type coaxial connector body
18a Connection structure of Example 1 of the present invention (no heat-shrinkable tube)
18b Connection structure of Example 2 of the present invention (with heat shrinkable tube)
20 Solder
21Flexible high frequencycoaxial cable
22 Soldering holes
23, 23 (a), 23 (b), 23 (c) Heat shrinkable tube
24 Tapered soldering groove
30 Connection structure of Example 3 of the present invention (Central contact transferJack type coaxial connector assembly)
31 Jack connector body with jack type converter
32 Jack type converter
40 Connection structure of embodiment 4 of the present invention (center contact switching plug type coaxial connector assembly)
41 Plug connector body with central contact switching part
42 Central contact switching part
  f Flange
  g End surface of integrated outer conductor
  h Center conductor fitting part
  i Mating center contact fitting part
  j Screw thread
  k Center contact pin
  n gap

Claims

Sequentially on the outer periphery of the center conductor, an insulator, an outer conductor of the inner formed by spiral winding of a metal foil, outside of the outer conductor formed by braiding, before Symbol inner outer conductor and the outer external conductor buffer for which is interposed between A connection structure between a flexible high-frequency coaxial cable made of a resin tape and a sheath and a coaxial connector provided with a metal shell,
The previous end of the flexible RF coaxial cable, an outer outer conductor sheath exposed by peeling, and the inner outer conductor under the outer outer conductor, is interposed between the front Symbol inner outer conductor and the outer external conductor buffer periphery which is formed in integral outer conductor formed of resin tape and tin coating (lead-free solder) or a solder coating one conjugated outer conductors which are integrated by (lead-containing solder) is tip insulator use and above end, the integrated external-edge of the conductor forming the destination end center conductor and insulator are step processing to expose sequentially, also the outer peripheral surface of the integrated outer conductor of the remainder of the integrated external conductor formed tip flanges which spiral irregularity processing is given is a step-helical roughened connection tip, also adhesive is applied only to the helical roughened outer peripheral table surface, the tip portion is extended toward the inside And spiral irregularities on the inner surface To the flange inner wall of Engineering has been subjected metallic shell, wherein the rotary inserted to the distal end face of the integrated outer conductor of the stepped-helical roughened connection tip is crimped abutment flange inner wall integral outer conductor tip the abutment crimp portion of the surface and electrical connections, the applied adhesive is cured, the step-helical roughened connecting tip and the metallic shell is mechanically secured and electrically connected a flexible A metal shell with a high-frequency coaxial cable, and a flexible high-frequency coaxial cable connected to the coaxial connector body.

Sequentially on the outer periphery of the center conductor, an insulator, an outer conductor of the inner formed by spiral winding of a metal foil, outside of the outer conductor formed by braiding, before Symbol inner outer conductor and the outer external conductor buffer for which is interposed between A connection structure between a flexible high-frequency coaxial cable made of a resin tape and a sheath and a coaxial connector provided with a metal shell,
The previous end of the flexible RF coaxial cable, an outer outer conductor sheath exposed by peeling, and the inner outer conductor under the outer outer conductor, is interposed between the front Symbol inner outer conductor and the outer external conductor buffer periphery which is formed in integral outer conductor formed of resin tape and tin coating (lead-free solder) or a solder coating one conjugated outer conductors which are integrated by (lead-containing solder) is tip insulator use and above end, the integrated external-edge of the conductor forming the destination end center conductor and insulator are step processing to expose sequentially, also the outer peripheral surface of the integrated outer conductor of the remainder of the integrated external conductor formed tip Has a stepped connection tip with no processing, and an adhesive is applied only to the outer peripheral surface of the unprocessed integrated outer conductor, and the tip has a flange extending inward and on the inner surface. equipped with a projection, the flange direction Using a metal shell having a tapered and ing holes I, is press-fitted to the front end surface of the integrated outer conductor of the step processing connecting tip flange inner wall abuts abuts the flange inner wall integral outer conductor distal end face crimping A flexible high-frequency coaxial cable-attached metal shell body in which the applied adhesive is cured, the stepped connection connection tip and the metal shell are mechanically fixed and electrically connected A connection structure between a flexible high-frequency coaxial cable and a coaxial connector, characterized by being mounted on the coaxial connector body.

3. The flexible high-frequency coaxial cable and the coaxial connector according to claim 2, wherein a support corresponding to the protrusion on the inner surface of the metal shell is provided on the outer peripheral surface of the integrated outer conductor at the stepped connection connecting tip. Connection structure.

The coaxial connector main body is a plug-type coaxial connector main body, a central contact reconnecting jack type coaxial connector main body, or a central contact reconnecting plug type coaxial connector main body, and the flexible high frequency 4. The connection structure between a flexible high-frequency coaxial cable and a coaxial connector according to claim 1, wherein a coaxial cable-attached metal shell body is inserted and fastened and fixed by a metal clamp.

5. The connection structure according to claim 4, wherein the metal clamp includes a protective pipe portion having a flexible high-frequency coaxial cable protection function at a rear side, and a minimum bending diameter of the flexible high-frequency coaxial cable is provided on an inner surface at a rear end of the protective pipe portion. In consideration of bending resistance, one or more heat-shrinkable tubes straddling both are stepwise provided at a step portion between the protective pipe portion and the flexible high-frequency coaxial cable adjacent thereto. A connection structure between a flexible high-frequency coaxial cable and a coaxial connector, characterized by being mounted.

5. The connection structure according to claim 4, wherein the metal clamp has a metal or resin armor (protective sheath) capable of restricting a minimum bending diameter of the flexible high-frequency coaxial cable in the rear, or partially or partially on the flexible high-frequency coaxial cable. mounted, also in the step portion between the armor table surface and the flexible semi-rigid to case b le, flexible RF coaxial cable and the coaxial connector, characterized in that one or more of the heat shrinkable tube as required is mounted Connection structure with.