JP2004240296A - Tool for specifying coated optical fiber and method for identifying coated optical fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool for specifying a coated optical fiber by which visible rays are made to exit outside and a coated optical fiber can be specified by visual check, and to provide a method for specifying a coated optical fiber. <P>SOLUTION: A coated optical fiber 11 is disposed in a light shielding space and curved with such a radius of curvature that the communication light used for optical communication does not emit outside but visible light at shorter wavelength than that of the communication light emits outside, by using the tool for specifying a coated optical fiber. The coated optical fiber 11 with the visible light entering can be specified by an operator by checking the curved state of the fiber through a check window. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【００２４】
【表２】

【００２５】
【表３】

【００２６】
【表４】

【００２７】
【表５】

【００２８】
表１に示すように、案内片２４の断面形状が１６種類あり、案内部本体２３から頭頂部２４ｂまでの厚み方向寸法である突出長さｈ１、頭頂部の曲率半径Ｒ１および裾野部２４ａの曲率半径Ｒ２を変えている。種類１は、ｈ１は４．５ｍｍであり、Ｒ１は６ｍｍであり、Ｒ２は５．５ｍｍである。種類２〜６まで、順次、種類１のｈ１を０．５ｍｍ間隔で大きくしている。種類７〜１１まで、順次、種類６のＲ１を０．１ｍｍ間隔で小さくしている。種類１２〜１６まで、順次、種類１１のＲ１を０．５ｍｍ間隔で小さくし、種類１１のＲ２を０．５ｍｍ間隔で大きくしている。
【００２９】
表２〜表５に示すように、案内片２４の種類によって線路損失が異なり、また光ファイバ芯線１１の数によって曲げ強度が異なるので、単芯線、４芯テープ線および８芯テープ線は相互に線路損失が異なる。ここで好適な案内片２４の種類は、光通信への影響が無視できる線路損失の種類が選ばれ、たとえば線路損失の最大値が３ｄＢ以下であり、かつ変域が１ｄＢ以下の種類が選択される。したがって、単芯線に関しては、前述の条件に従って、安全側に検討するため、種類８が選ばれる。４芯テープ線に関しては、単芯線と同様に、安全側に検討するため、種類１１が選ばれる。８芯テープ線に関しては、全種類で条件を満足するので、４芯テープ線と同じ種類１１が選ばれる。
【００３０】
把持部２１は、たとえばポリアセタールなどの合成樹脂から成り、大略的に長尺長方形板状の把持部本体２９と、把持部本体２９における幅方向両側部から厚み方向一方に突出する２つの壁体３０とを有する。また把持部本体２９には、厚み方向に貫通し、内ねじが刻設される把持部止めねじ孔３１が形成される。壁体３０は、把持部本体２９の厚み方向に貫通する第１軸孔３２が形成される。
【００３１】
把持部２１は、案内部２０の長手方向他端部に、厚み方向一方側から着脱自在に装着される。具体的には、把持部２１は、壁体３０を案内部本体２３側に配置して、保持凹部１に嵌合される。把持部止めねじ孔３１に、外ねじが刻設される固定ねじ部材２２を厚み方向一方側に挿通し、その固定ねじ部材２２を、頭部が案内部２０に係止される状態で案内部止めねじ孔２６を利用して、案内部２０に螺着し、把持部２１が案内部２０に固定される。把持部止めねじ孔３１および案内部止めねじ孔２６は、各部２１，２０の長手方向に沿って複数、本実施の形態では２カ所形成され、把持部２１の案内部２０に対する固定ねじ部材２２まわりの角変位が阻止される。
【００３２】
図９は、遮光筒体１４、第２狭持片１９および遮光体１２を拡大して示す断面図であり、図１０は、遮光筒体１４および第２狭持片１９を拡大して示す平面図である。図１１は、遮光体１２示す平面図である。図１〜５も併せて参照して、遮光筒体１４および第２狭持片１９は、一体となって形成される。第２狭持片１９は、たとえばポリアセタールなどの合成樹脂から成り、長手方向に関して断面形状が略Ｌ字状の部材であって、遮光部３３、当接部３４および押圧部３５を含んで構成される。遮光部３３は、略円筒状であって、遮光部３３の軸線方向他端部に、可視光を透孔可能な確認窓３７が形成される。
【００３３】
当接部３４は、略正方形板状であって、厚み方向に貫通する貫通孔３６が形成される。貫通孔３６は、略円錐台上であって、厚み方向一端部から厚み方向他端部に向かって拡径するようにテーパ状に形成される。厚み方向他端面部は、第１狭持辺１８の案内片２４の周囲の案内部本体２３の表面部に、環状の当接領域で遮光状態に当接可能である。当接部３４の厚み方向一端面部における貫通孔３６の内径は、遮光部３３の軸線方向一端部の内径と等しく形成される。当接部３４および遮光部３３の軸線が同軸の状態で、遮光部３３の軸線方向一端面部は当接部３４の厚み方向一端面部に遮光状態で当接して、一体に形成される。これによって当接部３４と案内部２０とを当接した状態で、遮光部３３の軸線方向他端部である確認窓３７は被狭持部位間の中間部に臨む位置にあり、確認窓３７が閉塞されることによって、遮光空間が形成される。
【００３４】
押圧部３５は、大略的に長尺長方形板状であって、長手方向中間部に幅方向に貫通する第２軸孔３８が形成される。押圧部３５は、厚み方向一方側の表面部に厚み方向一方に開放するばね嵌合凹所３９が形成される。押圧部３５の長手方向一端面部は、押圧部３５の厚み方向両端面部が、当接部３４の一側面部に対して傾いた状態で、当接部３４の一側面部に当接し、一体となって形成される。
【００３５】
遮光筒体１４は、たとえばポリアセタールなどの合成樹脂から成り、可視光を遮光可能な略円筒状に形成される。遮光部３３の厚み寸法は一定であって、軸線方向一端部から軸線方向他端部に向かって拡径するようにテーパ状に形成される。遮光筒体１４の軸線方向一端部の内径は、遮光部３３の内径と等しく形成される。遮光筒体１４および遮光部３３の軸線が同軸の状態で、遮光筒体１４の軸線方向一端面部は、遮光部３３の軸線方向他端面部に遮光状態で連結して、一体に形成される。遮光筒体１４はテーパ状に形成されるので、操作者が軸線方向他端部から目視することによって、軸線方向一端部を容易に確認することができる。
【００３６】
遮光体１２は、略正方形板状であって、厚み方向に円柱状に貫通する遮光体孔４０が形成される。遮光体１２は、各狭持片１８，１９の長手方向一端部が相互に当接し、光ファイバ芯線１１を狭持している状態で、当接領域で遮光状態に当接し、かつ光ファイバ芯線１１を弾発的に狭持するような材料が選択される。遮光体１２は、たとえばスポンジゴムから成り、具体的にはエチレンプロピレン（略称：ＥＰＤＭ）ゴム発砲体およびエプトシーラー（登録商標）などから成る。遮光体孔４０の内径は、遮光部３３の軸線方向他端面部の貫通孔３６の内径と等しく形成される。遮光体１２および当接部３４の軸線が同軸の状態で、遮光体１２の厚み方向一端面部と、当接部３４の軸線方向他端面部と当接して、接着剤を介して機械的に接続する。遮光体１２によって、容易に遮光空間が形成される。
【００３７】
各狭持片１８，１９は、第１狭持片１８の案内片２４が、第２狭持片１９の当接部３４の貫通孔３６に挿入するように、さらに把持部２１の厚み方向一端面部と、押圧部３５の厚み方向一端面部とが、相互に対向するように配置される。このように配置された状態で、軸部材１６が、その軸線を、各狭持片に各軸孔３２，３８の軸線と一致させて、各軸孔３２，３８に共通に挿通されて設けられ、この軸部材１６によって、各狭持片が、軸部材１６の軸線と一致する角変位軸線Ｌ１６まわりに角変位自在に連結される。
【００３８】
軸部材１６は、円筒状の部材であって、内ねじが刻設されるとともに、軸線方向一端部には外向きフランジ部１６ａが形成されている。この軸部材１６には、外ねじが刻設される軸止めねじ部材１７が螺着され、軸部材１６の外向きフランジ部１６ａと、軸止めねじ部材１７の頭部とによって、第１挟持片１８の壁体３０を一緒に挟持している。これによって軸部材１６が抜止めされるとともに、各狭持片１８，１９の不所望な変位を防止して、各挟持片１８，１９が、角変位軸線Ｌ１６まわりに円滑に角変位するようにできる。
【００３９】
ばね部材１５は、第１狭持片１８の長手方向一端部に第２狭持片１９の当接部３４の厚み方向他端面部が当接する押圧力、具体的には、ばね力を発生させる押圧力発生手段であって、本実施の形態では、たとえばねじりコイルばねによって実現される。このばね部材１５は、第２挟持片１９の押圧部３５に形成されるばね嵌合凹所３９に嵌まり込み、軸部材１６が挿通した状態で設けられる。この状態で、ばね部材１５の両端部が各挟持片１８，１９に弾発的に当接され、各挟持片１８，１９に、離反するばね力が与えられる。
【００４０】
光ファイバ芯線特定用工具１０は、操作者によって操作力が与えられていない状態では、ばね部材１５のばね力によって、第１狭持片１８の長手方向一端部に第２狭持片１９の当接部３４の厚み方向他端面部が当接している状態（以下、単に「当接状態」ということがある）にある。この当接状態から、ばね力よりも大きな操作力を与えて、第１狭持片１８の把持部２１の厚み方向一端面部が、第２狭持片１９の押圧部３５の厚み方向一端面部に当接するように角変位軸線Ｌ１６まわりに角変位させる。これによって当接状態から、第１狭持片１８の長手方向一端部と、第２狭持片１９の当接部３４の厚み方向他端面部が離反している状態（以下、単に「離反状態」ということがある）にすることができる。この離反状態から、操作力を解除すると、ばね部材１５のばね力によって、各挟持片１８，１９が角変位軸線Ｌ１６まわり角変位され、当接状態になる。ばね部材１５のばね力は、当接状態で光ファイバ芯線１１を狭持しているときに、光ファイバ芯線１１を不所望に変形させないように、かつ当接領域が遮光状態で当接されるように選択される。
【００４１】
光ファイバ芯線特定用工具１０の寸法は、一例を挙げると、第１狭持片１８の把持部２１の長手方向の長さ寸法Ｌ１が約１０５ｍｍであり、長手方向他端部の幅寸法Ｗ１が２５ｍｍである。第１狭持片１８の案内部本体２３の長手方向の長さ寸法Ｌ２が約６６ｍｍである。遮光筒体１４の軸線方向の長さ寸法Ｌ３は、約５５ｍｍであり、軸線方向一端部の内径Ｄ１が約１０ｍｍであり、軸線方向他端部の内径Ｄ２が約２０ｍｍである。第２狭持片１９の当接部３４の厚み寸法Ｔ１が約５ｍｍであり、軸線方向一端部の内径Ｄ３が約２０ｍｍである。前記寸法は、一例であり、これに限定されることはないが、第１狭持片１８の把持部２１および第２狭持片の押圧部３５の寸法は、作業者が片手で容易に作業可能な寸法に形成される。また遮光筒体の長さ寸法Ｌ３および内径Ｄ１は、光ファイバ芯線１１から可視光が出射しているか否かを容易に確認できる寸法に形成される。
【００４２】
光ファイバ芯線特定用工具１０は、少なくとも遮光空間を形成する部材は、可視光を吸収しやすく、乱反射しにくい色が選択され、たとえば黒色が選択される。これによって、操作者は光ファイバ芯線１１から可視光が外部に出射するのを容易に確認することができる。
【００４３】
本実施の形態では、保持体１３は、光ファイバ芯線１１を遮光空間に湾曲状態で挿通して保持する。湾曲状態に保持している光ファイバ芯線１１に、可視光を入射すると、可視光は外部に出射される。したがって作業者は確認窓３７を介して可視光の出射状態を確認することができる。また複数の光ファイバ芯線１１に、予め定める基準位置から可視光を入射し、基準位置とは異なる作業位置において、複数の光ファイバ芯線１１を順次、湾曲して保持することによって、入射された可視光に対応する光ファイバ芯線１１を作業位置で特定することができる。したがって光ファイバ芯線特定用工具１０は、可視光が入射される光ファイバ芯線１１を、光検出器などの電子部品を用いることなく、簡単な構成で実現することができる。
【００４４】
また本実施の形態では、保持体１３は、通信光が外部に出射されることなく、かつ可視光が外部に出射される曲率半径で湾曲させて、光ファイバ芯線１１を保持する。したがって光ファイバ芯線特定用工具１０を用いて、通信光が入射されている光ファイバ芯線１１を湾曲させても、通信光が外部に出射されないので、通信に障害を与えることがない。したがって複数の光ファイバ芯線１１のうち少なくともいずれか１本に通信光が入射されている場合であっても、通信に障害を与えることなく、順次湾曲させて、可視光が入射されている光ファイバ芯線１１を特定することができる。
【００４５】
また本実施の形態はで、保持体１３は、２つの狭持片１８，１９を有し、この狭持片１８，１９間に光ファイバ芯線１１が狭持可能である。各狭持片１８，１９が、環状の当接領域で相互に当接した状態で、確認窓３７が閉塞されることによって遮光空間が形成される。また一方の第１狭持片１８には、被狭持部位間の中間部位を、各被狭持部位を通る直線からずれた位置に案内する案内片２４が形成される。これによって、被狭持部位間に光ファイバ芯線１１を配置し、各狭持片１８，１９によって光ファイバ芯線１１を狭持することによって、光ファイバ芯線１１を湾曲状態に保持することができる。また他方の第２狭持片１９は、光ファイバ芯線１１の前記被狭持部位間の中間部を臨む確認窓３７が形成されるので、前記案内片２４によって湾曲状態にある光ファイバ芯線１１を確認窓３７から確認するこができる。これによって作業者は、容易な操作で可視光が入射される光ファイバ芯線１１を特定することができる。
【００４６】
また本実施の形態では、遮光筒体１４は、可視光を遮光可能な筒状に形成され、一端部が保持体１３に遮光状態で連結される。このような遮光筒体１４が連結されるので、保持体１３によって形成される遮光空間に、遮光筒体１４の両端部が閉塞されることによって形成される遮光空間を連結し、光ファイバ芯線特定用保持具１０に形成される遮光空間を広げることができる。遮光筒体１４の他端部は、確認窓３７を介して遮光空間を確認可能である。したがって保持体１３が光ファイバ芯線１１を保持する位置から、少なくとも遮光筒体１４の軸線寸法離れている位置で、光ファイバ芯線１１を確認することできる。これによって湾曲状態に保持されている光ファイバ芯線１１に、作業者が容易に焦点を合わすことができる距離を、遮光して確保することができる。したがって利便性を向上することができる。
【００４７】
図１２は、本発明の実施の他の形態の光ファイバ芯線特定用工具５０を示す正面図であり、図１３は、光ファイバ芯線特定用工具５０を示す側面図である。図１４は、光ファイバ芯線特定用工具５０を分解して示す側面図である。図１２および図１４は、理解を容易にするため、遮光体１２を省略して示す。本実施の形態は前述の図１〜図１１の光ファイバ芯線特定用工具１０と類似しており、本実施の形態の構成には光ファイバ芯線特定用工具１０における対応する構成と同一の参照符号を付し、異なる構成についてだけ説明し、同様の構成については説明を省略する。本実施の形態の光ファイバ芯線特定用工具５０は、前述の光ファイバ芯線特定用工具１０に対して、第２狭持片５１の構成および遮光筒体５２の構成が異なる。
【００４８】
図１５は、本実施の形態の第２狭持片５１を拡大して示す断面図であり、図１６は、第２狭持片５１を拡大して示す底面図であり、図１７は、第２狭持片５１を拡大して示す側面図である。本実施の形態の第２狭持片５１は、前述の第２狭持片１９の遮光部３３を除く残余の部分と類似している。第２狭持片５１の当接部５３は、貫通孔３６が形成されている周囲の領域に厚み方向に貫通し、内ねじが刻設される皿ねじ孔５４が形成される。皿ねじ孔５４は、貫通孔３６の周囲の領域に、周方向に４等分する位置に４つ形成される。
【００４９】
図１８は、本実施の形態の遮光筒体５２を構成する第１接続部５５を拡大して示す平面図であり、図１９は、第１接続部５５を拡大して示す底面図である。図２０は、遮光筒体５２を構成する締付部５６を拡大して示す底面図である。図２１は、遮光筒体５２を構成する挿入部６７を拡大して示す底面図である。図２２は、遮光筒体５２を構成する第２接続部５７を拡大して示す平面図であり、図２３は第２接続部５７を拡大して示す底面図である。図２４は、遮光筒体５２を構成する確認部５８を幅方向に平行な平面で切断し、拡大して示す断面図であり、図２５は、確認部５８を幅方向に垂直な平面で切断し、拡大して示す断面図である。図２６は、確認部５８を拡大して示す平面図であり、図２７は、確認部５８を拡大して示す底面図である。遮光筒体５２は、第１接続部５５、締付部５６、挿入部６７、第２接続部５７、第２接続ねじ部材および確認部５８を含んで構成される。
【００５０】
第１接続部５５は、正方形板状の第１接続部本体６０および係合爪６２を含んで形成される。第１接続部本体６０は、厚み方向に貫通する第１透過孔６１が形成される。第１透過孔６１の内径は、当接部５３の厚み方向一端面部における貫通孔３６の内径と等しく形成される。第１接続部本体６０は、厚み方向一端面部に厚み方向中央部に向かって凹となり、内ねじが刻設される第１ねじ孔６３が角部に４つ形成される。また厚み方向他端面部に４つの角部から、厚み方向外方に向かって突出する係合爪６２が形成される。第１接続部５５および第２狭持片５１の当接部５３の軸線が同軸の状態で、第１接続部５５の厚み方向一端面部が、当接部５３の厚み方向一端面部に当接させる。当接した状態で、皿ねじ孔５４に、外ねじが刻設される第１接続ねじ部材６４を厚み方向他方側に挿通し、その第１接続ねじ部材６４を、頭部が当接部５３に係止される状態で第１透過孔６１を利用して、第１接続部５５に螺着し、当接部５３が、第１接続部５５に固定される。
【００５１】
締付部５６は、締付部本体６５およびチャック部材６６を含んで構成される。締付部本体６５は、略円筒状の部材であって、軸線方向一端部はチャック構造が形成される。締付部本体６５の軸線方向一端部は、周方向に複数に分断され、半径方向に変位可能形成され、外ねじが刻設される。チャック部材６６は円筒状であって、締付部５６の外ねじと螺合可能な内ねじが刻設される。チャック部材６６を締付部本体６５に螺着させ、螺進および螺退させて、締付部本体６５に対して軸線方向に変位させることによって、締付部本体６５の軸方向一端部は、半径方向に変位する。締付部５６の軸線方向他端部は、第１接続部５５の係合爪６２に係合され、さらに接着剤を用いて接着され機械的に接続される。
【００５２】
挿入部６７は、円筒状の部材である。挿入部６７の外径は、締付部本体６５の自然状態における内径と外接し、軸線方向に締付部５６に対してずれるような寸法に形成される。挿入部６７の軸線方向一端部を、締付部５６の軸線方向一端部から挿入し、チャック部材６６を用いて、締付部本体６５の軸線方向一端部を半径方向内方に変位させ、締付部本体６５の内周部を、挿入部６７の外周部に当接させる。これによって、挿入部６７の軸線方向における任意の位置で、締付部５６に固定することができ、遮光筒体５２の軸線方向に寸法を任意の値に変化させることができる。したがって操作者が光ファイバ芯線１１を容易に確認できるように、遮光筒体５２の軸線方向寸法を調節することができる。
【００５３】
第２接続部５７は、第２接続部本体６９および第２接続部円筒体７０を含んで構成される。第２接続本体２は、略楕円形板状であって、幅方向中央部に、厚み方向に貫通する第２透過孔７１が形成される。第２透過孔７１の内径は、締付部５６の内径よりも小さく形成される。また第２接続部本体６９は、幅方向両端部に厚み方向に貫通し、内ねじが刻設される第２ねじ孔７４が形成される。第２接続部円筒体７０は、円筒状の部材であって、その内径は、挿入部６７の外径と等しく形成される。第２接続部本体６９および第２接続部円筒体７０の軸線が同軸の状態で、第２接続部円筒体７０の軸線方向一端面部は、第２接続部本体６９の厚み方向一端面部に当接して、一体に形成される。第２接続部円筒体７０および挿入部６７の軸線が同軸の状態で、第２接続部円筒体７０の軸線方向他端面部は、挿入部６７の軸線方向他端面部に接着剤を用いて接着され、機械的に接続される。
【００５４】
確認部５８は、軸線方向一端部が塞がれている略有底筒状であって、軸線方向に垂直な断面形状は略楕円状に形成される。軸線方向他端部である開放端部は、長辺方向に関し、その両端部は、中間部より底面に向かって凹となる凹状に形成される。また開放端部は、短辺方向に関し、その両端部は、中間部より軸線方向外方に向かって凸なる凸状に形成される。これによって開放端部は、操作者の目の周囲の形状にならいやすく形成される。軸線方向一端部である底面部は、その中央部に軸線方向に貫通する確認孔７２が形成される。確認孔７２の内径は、第２接続部本体６９の第２透過孔７１の内径と等しく形成される。また底面部は、その長辺方向両端部であって、軸線方向に開放端側に向かって凹となり、内ねじが刻設される確認部ねじ孔７３が形成される。確認部５８および第２接続部５７の軸線が同軸の状態で、確認部５８の底面部が、第２接続部５７の軸線方向他端面部に当接させる。当接した状態で、第２ねじ孔７４に、外ねじが刻設される第２接続ねじ部材５９を軸線方向他方側に挿通し、その第２接続ねじ部材５９を、頭部が第２接続部５７に係止される状態で確認部ねじ孔７３を利用して、確認部５８に螺着し、第２接続部５７が、確認部５８に固定される。
【００５５】
このような本実施の形態の光ファイバ芯線特定用工具５０によれば、光ファイバ芯線１１を特定することができる。したがって前述の実施の形態の光ファイバ芯線特定用工具１０と同様の効果を達成することができる。
【００５６】
図２８は、本発明の実施のさらに他の形態の光ファイバ芯線特定用工具８０を示す正面図であり、図２９は、光ファイバ芯線特定用工具８０を示す側面図である。図３０は、光ファイバ芯線特定用工具８０を分解して示す正面図である。図３１は、光ファイバ芯線特定用工具８０を分解して示す側面図である。図２８〜図３１は、理解を容易にするため、遮光体１２を省略して示す。本実施の形態は前述の図１〜図２７の光ファイバ芯線特定用工具１０，５０と類似しており、本実施の形態の構成には光ファイバ芯線特定用工具１０，５０における対応する構成と同一の参照符号を付し、異なる構成についてだけ説明し、同様の構成については説明を省略する。本実施の形態の光ファイバ芯線特定用工具８０は、前述の光ファイバ芯線特定用工具５０に対して、遮光筒体８１の構成および第１狭持片８２の構成が異なる。
【００５７】
図３２は本実施の形態の遮光筒体８１を構成する接続部８３を拡大して示す平面図であり、図３３は接続部８３を拡大して示す底面図である。本実施の形態の遮光筒体８１は、前述の遮光筒体５２を構成する第１接続部５５の係合爪６２、締付部５６、挿入部６７および第２接続部５７の第２接続部円筒体７０を除く残余の部分から構成される。遮光筒体８１は、接続部８３および確認部５８を含んで構成される。接続部８３は、接続部本体８４および接続部底体８５を含んで構成される。接続部本体８４は、前述の第２接続部５７を構成する第２接続部本体６９と類似している。接続部底体８５は、前述の第１接続部５５を構成する第１接続部本体６０と類似している。接続部本体８４および接続部底体８５の軸線が同軸の状態で、一体となって形成される。前述の光ファイバ芯線特定用工具５０と同様に、接続部本体８４は確認部５８と、接続部底体８５は第２狭持片５１と機械的に接続され、固定される。これによって遮光筒体８１を構成する部品数を、前述の光ファイバ芯線特定用工具５０に比べて少なくすることができ、軽量化することができる。
【００５８】
図３４は、本実施の形態の第１狭持片８２を構成する案内部８６を拡大して示す平面図である。本実施の形態の案内部８６は、前述の案内部２０に対して形成される案内片８７が異なり、また挿入凹所２７が形成されていない。案内片８７は、案内部８６の幅方向中央部に厚み方向一方に突出する頭頂部８８が形成される。頭頂部８８は、案内部８６の幅方向に平行な平坦面に形成される。案内片８７は、長手方向に延びて形成され、長手方向の断面形状および幅方向の断面形状は、略台形状に形成される。これによって第１狭持片８２と第２狭持片５１とで光ファイバ芯線１１を狭持することによって、光ファイバ芯線１１を湾曲させることができる。また案内片８７の底面部の幅および突出高さを変化させることによって、光ファイバ芯線１１を好適に湾曲させることができる。
【００５９】
このような本実施の形態の光ファイバ芯線特定用工具８０によれば、光ファイバ芯線１１を特定することができる。したがって前述の実施の形態の光ファイバ芯線特定用工具１０，５０と同様の効果を達成することができる。
【００６０】
図３５は、本発明の実施のさらに他の形態の光ファイバ芯線特定用工具９０を構成する第１狭持片９１の当接部９２を示す側面図であり、図３６は、当接部９２を示す平面図である。本実施の形態は前述の図１〜図３４の光ファイバ芯線特定用工具１０，５０，８０と類似しており、本実施の形態の構成には光ファイバ芯線特定用工具１０，５０，８０における対応する構成と同一の参照符号を付し、異なる構成についてだけ説明し、同様の構成については説明を省略する。本実施の形態の光ファイバ芯線特定用工具９０は、前述の光ファイバ芯線特定用工具８０に対して、第１狭持片９１の構成が異なる。
【００６１】
本実施の形態の第１狭持片９１を構成する案内部９３が異なり、具体的には案内部９３に形成される案内片９４が異なる。案内片９４は、案内部９３の幅方向中央部に厚み方向一方に突出する頭頂部４が形成される。頭頂部４は、案内部９３の幅方向に平行な平坦に形成される。案内片９４は、長手方向に延びて形成され、長手方向の断面形状および幅方向の断面形状は、略長方形状に形成される。これによって第１狭持片９１と第２狭持片５１とで光ファイバ芯線１１を狭持することによって、光ファイバ芯線１１を湾曲させることができる。また案内片９４の幅および突出高さを変化させることによって、光ファイバ芯線１１を好適に湾曲させることができる。
【００６２】
このような本実施の形態の光ファイバ芯線特定用工具９０によれば、光ファイバ芯線１１を特定することができる。したがって前述の実施の形態の光ファイバ芯線特定用工具１０，５０，８０と同様の効果を達成することができる。
【００６３】
図３７は、光ファイバ芯線特定用工具を用いて光ファイバ芯線を特定する行程を示すフローチャートである。ステップａ０おいて、光ファイバ芯線１１を特定する行程が開始されると、ステップａ１において、予め定める基準位置から予め定める光ファイバ芯線１１に、たとえばレーザダイオード光源を用いて可視光を入射し、ステップａ２に進む。ステップａ２において、前記基準位置とは異なる位置において、光ファイバ芯線１１を、遮光空間に配置し、ステップａ３に進む。遮光空間に配置することによって、光ファイバ芯線１１の中途部における発光状態を容易に確認することができる。ステップａ３において、光ファイバ芯線１１を、光通信に用いられる通信光が外部に出射することなく、かつ前記可視光が外部に出射する曲率半径で湾曲させ、ステップａ４に進む。前記曲率半径で湾曲させるので、光通信に影響を与えることなく、可視光が入射されている光ファイバ芯線１１を湾曲させ、可視光を外部に出射させることができる。ステップａ４において、作業者が、光ファイバ芯線１１の湾曲している部分を目視確認することによって、可視光が入射されている光ファイバ芯線１１を特定することができ、ステップａ５に進んで特定する作業を終了する。
【００６４】
本実施の形態では、光ファイバ芯線１１は、通信光が外部に出射することなく、かつ基準位置から入射される可視光が外部に出射する曲率半径で、基準位置とは異なる位置において湾曲させる。これによって可視光が入射されている光ファイバ芯線１１を特定する場合に、誤って通信光が入射されている光ファイバ芯線１１を湾曲させても、通信光が外部に出射されないので、通信に障害を与えることがない。また入射される可視光が外部に出射するので、湾曲している光ファイバ芯線１１を遮光空間に配置し、目視確認することによって、可視光が入射されている光ファイバ芯線を、特定することができる。したがって容易に可視光が入射されている光ファイバ芯線１１を特定することができる。
【００６５】
【発明の効果】
以上のように本発明によれば、保持体は、光ファイバ芯線を遮光空間に湾曲状態で挿通して保持する。湾曲状態に保持している光ファイバ芯線に、可視光を入射すると、可視光は外部に出射される。したがって作業者は確認窓を介して可視光の出射状態を確認することができる。また複数の光ファイバ芯線に、予め定める基準位置から可視光を入射し、基準位置とは異なる作業位置において、複数の光ファイバ芯線を順次、湾曲して保持することによって、入射された可視光に対応する光ファイバ芯線を作業位置で特定することができる。したがって光ファイバ芯線特定用工具は、可視光が入射される光ファイバ芯線を、光検出器などの電子部品を用いることなく、簡単な構成で実現することができる。
【００６６】
また本発明によれば、保持体は、通信光が外部に出射されることなく、かつ可視光が外部に出射される曲率半径で湾曲させて、光ファイバ芯線を保持する。したがって光ファイバ芯線特定用工具を用いて、通信光が入射されている光ファイバ芯線を湾曲させても、通信光が外部に出射されないので、通信に障害を与えることがない。したがって複数の光ファイバ芯線のうち少なくともいずれか１本に通信光が入射されている場合であっても、通信に障害を与えることなく、順次湾曲させて、可視光が入射されている光ファイバ芯線を特定することができる。
【００６７】
また本発明によれば、保持体は、２つの狭持片を有し、この狭持片間に光ファイバ芯線が狭持可能である。各狭持片が、環状の当接領域で相互に当接した状態で、確認窓が閉塞されることによって遮光空間が形成される。また一方の狭持片には、被狭持部位間の中間部位を、各被狭持部位を通る直線からずれた位置に案内する案内手段が形成される。これによって、被狭持部位間に光ファイバ芯線を配置し、各狭持片によって光ファイバ芯線を狭持することによって、光ファイバ芯線を湾曲状態に保持することができる。また他方の狭持片は、光ファイバ芯線の前記被狭持部位間の中間部を臨む確認窓が形成されるので、前記案内手段によって湾曲状態にある光ファイバ芯線を確認窓から確認するこができる。これによって作業者は、容易な操作で可視光が入射される光ファイバ芯線を特定することができる。
【００６８】
また本発明によれば、遮光筒体は、可視光を遮光可能な筒状に形成され、一端部が保持体に遮光状態で連結される。このような遮光筒体が連結されるので、保持体によって形成される遮光空間に、遮光筒体の両端部が閉塞されることによって形成される遮光空間を連結し、光ファイバ芯線特定用保持具に形成される遮光空間を広げることができる。遮光筒体の他端部は、確認窓を介して遮光空間を確認可能である。したがって保持体が光ファイバ芯線を保持する位置から、少なくとも遮光筒体の軸線寸法離れている位置で、光ファイバ芯線を確認することできる。これによって湾曲状態に保持されている光ファイバ芯線に、作業者が容易に焦点を合わすことができる距離を、遮光して確保することができる。したがって利便性を向上することができる。
【００６９】
また本発明によれば、光ファイバ芯線は、通信光が外部に出射することなく、かつ基準位置から入射される可視光が外部に出射する曲率半径で、基準位置とは異なる位置において湾曲させる。これによって可視光が入射されている光ファイバ芯線を特定する場合に、誤って通信光が入射されている光ファイバ芯線を湾曲させても、通信光が外部に出射されないので、通信に障害を与えることがない。また入射される可視光が外部に出射するので、湾曲している光ファイバ芯線を遮光空間に配置し、目視確認することによって、可視光が入射されている光ファイバ芯線を、特定することができる。したがって容易に可視光が入射されている光ファイバ芯線を特定することができる。
【図面の簡単な説明】
【図１】本発明の実施の一形態の光ファイバ芯線特定用工具１０に、光ファイバ芯線１１が保持されている状態で示す断面図である。
【図２】光ファイバ芯線特定用工具１０を示す正面図である。
【図３】光ファイバ芯線特定用工具１０を示す側面図である。
【図４】光ファイバ芯線特定用工具１０を分解して示す正面図である。
【図５】光ファイバ芯線特定用工具１０を分解して示す側面図である。
【図６】第１狭持片１８を構成する案内部２０を拡大して示す平面図である。
【図７】案内部２０の一端部をさらに拡大して示す正面図である。
【図８】第１狭持片１８を構成する把持部２１を拡大して示す底面図である。
【図９】遮光筒体１４、第２狭持片１９および遮光体１２を拡大して示す断面図である。
【図１０】遮光筒体１４および第２狭持片１９を拡大して示す平面図である。
【図１１】遮光体１２示す平面図である。
【図１２】本発明の実施の他の形態の光ファイバ芯線特定用工具５０を示す正面図である。
【図１３】光ファイバ芯線特定用工具５０を示す側面図である。
【図１４】光ファイバ芯線特定用工具５０を分解して示す側面図である。
【図１５】第２狭持片５１を拡大して示す断面図である。
【図１６】第２狭持片５１を拡大して示す底面図である。
【図１７】第２狭持片５１を拡大して示す側面図である。
【図１８】遮光筒体５２を構成する第１接続部５５を拡大して示す平面図である。
【図１９】第１接続部５５を拡大して示す底面図である。
【図２０】遮光筒体５２を構成する締付部５６を拡大して示す底面図である。
【図２１】遮光筒体５２を構成する挿入部６７を拡大して示す底面図である。
【図２２】遮光筒体５２を構成する第２接続部５７を拡大して示す平面図である。
【図２３】第２接続部５７を拡大して示す底面図である。
【図２４】遮光筒体５２を構成する確認部５８を幅方向に平行な平面で切断し、拡大して示す断面図である。
【図２５】確認部５８を幅方向に垂直な平面で切断し、拡大して示す断面図である。
【図２６】確認部５８を拡大して示す平面図である。
【図２７】確認部５８を拡大して示す底面図である。
【図２８】本発明の実施のさらに他の形態の光ファイバ芯線特定用工具８０を示す正面図である。
【図２９】光ファイバ芯線特定用工具８０を示す側面図である。
【図３０】光ファイバ芯線特定用工具８０を分解して示す正面図である。
【図３１】光ファイバ芯線特定用工具８０を分解して示す側面図である。
【図３２】遮光筒体８１を構成する接続部８３を拡大して示す平面図である。
【図３３】接続部８３を拡大して示す底面図である。
【図３４】第１狭持片８２を構成する案内部８６を拡大して示す平面図である。
【図３５】本発明の実施のさらに他の形態の光ファイバ芯線特定用工具９０を構成する第１狭持片９１の当接部９２を示す側面図である。
【図３６】当接部９２を示す平面図である。
【図３７】光ファイバ芯線特定用工具を用いて光ファイバ芯線を特定する行程を示すフローチャートである。
【図３８】従来の技術である光ファイバ芯線特定用工具１を示す斜視図である。
【符号の説明】
１０，５０，８０，９０ 光ファイバ芯線特定用工具
１１ 光ファイバ芯線
１３ 保持体
１４ 遮光筒体
１８ 第１狭持片
１９ 第２狭持片
２４ 案内片
３７ 確認窓[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to an optical fiber core specifying tool and an optical fiber core specifying method for specifying an optical fiber core by emitting light to the outside without breaking the optical fiber core into which the light is incident.
[0002]
[Prior art]
FIG. 38 is a perspective view showing a conventional optical fiber core wire specifying tool 1. The conventional optical fiber core wire specifying tool 1 is configured to be able to hold the optical fiber core wire 2 in a curved state at an intermediate portion of the optical fiber core wire 2. The communication light used for optical communication enters the optical fiber core wire 2 from one end in advance. The communication light is emitted to the outside by setting the middle part of the optical fiber core wire 2 in a curved state. The emitted communication light is detected by using the photodetector 3, and the optical fiber core wire 2 corresponding to the emitted communication light is specified (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-60-244907
[0004]
[Problems to be solved by the invention]
The conventional optical fiber core wire specifying tool 1 specifies the optical fiber core wire 2 using communication light. Since the communication light is not visible light, the optical fiber core wire specifying tool 1 requires the photodetector 3 for detecting the communication light emitted to the outside, and has a complicated structure. The conventional optical fiber identification tool 1 is inconvenient because it is not configured to emit visible light incident on the optical fiber core 2 to the outside and visually check the optical fiber core 2 to identify it. .
[0005]
Therefore, an object of the present invention is to provide an optical fiber core wire specifying tool and an optical fiber core wire specifying method capable of emitting visible light to the outside, visually checking and specifying the optical fiber core wire.
[0006]
[Means for Solving the Problems]
According to the present invention, a confirmation window capable of transmitting visible light is formed, a light-shielding space is formed in which the visible light is blocked by closing the confirmation window, and an optical fiber core wire is inserted into the light-shielding space in a curved state and held. An optical fiber core wire specifying tool characterized by including a holding member for performing the above operation.
[0007]
According to the invention, the holder inserts and holds the optical fiber core wire in a curved state in the light shielding space. When visible light enters the optical fiber core held in a curved state, the visible light is emitted to the outside. Therefore, the operator can confirm the emission state of visible light through the confirmation window. In addition, visible light is incident on a plurality of optical fiber cores from a predetermined reference position, and in a working position different from the reference position, the plurality of optical fiber cores are sequentially curved and held, so that the incident visible light is The corresponding optical fiber core can be identified at the working position. Therefore, the optical fiber core wire specifying tool can realize the optical fiber core wire on which visible light is incident with a simple configuration without using electronic components such as a photodetector.
[0008]
Further, according to the present invention, an optical fiber is provided in which the holding member is curved at a radius of curvature at which visible light having a shorter wavelength than the communication light is emitted to the outside without communication light used for optical communication being emitted to the outside. It is characterized by holding the core wire.
[0009]
According to the present invention, the holding body holds the optical fiber core wire without causing communication light to be emitted to the outside and by bending the communication light with a radius of curvature at which visible light is emitted to the outside. Therefore, even if the optical fiber core wire on which the communication light is incident is curved by using the optical fiber core wire specifying tool, the communication light is not emitted to the outside, so that communication is not hindered. Therefore, even when communication light is incident on at least one of the plurality of optical fiber cores, the optical fiber cores are sequentially curved without impairing communication, and visible light is incident thereon. Can be specified.
[0010]
Further, according to the present invention, the holding body comprises:
It has two holding pieces provided so as to be able to come into contact with and separate from each other, and each holding piece comes into contact with each other in a light blocking state in an annular contact area, and an optical fiber core wire is provided between these holding pieces. By arranging, it is possible to sandwich the optical fiber core wire at two places in the contact area,
On one of the holding pieces, a guide piece for guiding an intermediate portion between the held portions, which is a portion where the optical fiber core wire is held, to a position shifted from a straight line passing through each held portion, is formed.
The other holding piece is characterized in that a confirmation window facing an intermediate portion between the held portions of the optical fiber core wire is formed.
[0011]
According to the present invention, the holding body has two holding pieces, and the optical fiber core wire can be held between the holding pieces. The check window is closed in a state where the holding pieces are in contact with each other in the annular contact area, thereby forming a light shielding space. Further, one holding piece is provided with a guide means for guiding an intermediate portion between the held portions to a position shifted from a straight line passing through each held portion. Thus, the optical fiber core wire can be held in a curved state by arranging the optical fiber core wire between the portions to be held and holding the optical fiber core wire by each holding piece. Further, since the other holding piece has a confirmation window facing the intermediate portion between the held portions of the optical fiber core wire, the optical fiber core wire in a curved state can be confirmed from the confirmation window by the guide means. it can. Thereby, the operator can specify the optical fiber core wire on which the visible light is incident by an easy operation.
[0012]
Further, the present invention further includes a light-shielding tubular body formed in a tubular shape capable of blocking visible light, one end of which is connected to the holder in a light-shielded state, and a light-shielding space that can be confirmed from the other end through a confirmation window. It is characterized by the following.
[0013]
According to the present invention, the light-shielding tubular body is formed in a tubular shape capable of blocking visible light, and has one end connected to the holder in a light-shielded state. Since such a light-shielding cylinder is connected, the light-shielding space formed by closing both ends of the light-shielding cylinder is connected to the light-shielding space formed by the holder, and the optical fiber core wire specifying holder is connected. The light-shielding space formed in the area can be expanded. The other end of the light-shielding cylinder can check the light-shielding space through a check window. Therefore, the optical fiber core wire can be confirmed at least at a position away from the position where the holder holds the optical fiber core wire at the axial dimension of the light shielding cylinder. Thus, a distance at which the operator can easily focus on the optical fiber core wire held in a curved state can be secured by shielding light. Therefore, convenience can be improved.
[0014]
Further, the present invention, visible light is incident on a predetermined optical fiber core wire from a predetermined reference position,
At a position different from the reference position, the optical fiber core wire is arranged in a light-shielding space, and the communication light used for optical communication does not exit to the outside, and the visible light is curved at a radius of curvature at which the visible light exits to the outside. And visually confirming the optical fiber core wire specifying method.
[0015]
According to the present invention, the optical fiber core wire is curved at a position different from the reference position with a radius of curvature at which the visible light incident from the reference position exits without the communication light exiting to the outside. Thus, when specifying the optical fiber core wire on which the visible light is incident, even if the optical fiber core wire on which the communication light is incident is bent by mistake, the communication light is not emitted to the outside, so that communication is impaired. Nothing. Further, since the incident visible light is emitted to the outside, the curved optical fiber core wire is arranged in the light shielding space, and by visually checking, the optical fiber core wire to which the visible light is incident can be specified. . Therefore, it is possible to easily identify the optical fiber core wire on which the visible light is incident.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a cross-sectional view showing a state where an optical fiber core wire 11 is held by an optical fiber core wire specifying tool 10 according to an embodiment of the present invention. FIG. 2 is a front view showing the optical fiber core wire specifying tool 10, and FIG. 3 is a side view showing the optical fiber core wire specifying tool 10. FIG. 4 is an exploded front view showing the optical fiber core wire specifying tool 10, and FIG. 5 is an exploded side view showing the optical fiber core wire specifying tool 10. FIGS. 2 and 3 omit the thickness of the light shield 12 for easy understanding. The optical fiber core specifying tool 10 is a tool for specifying the optical fiber core 11 on which visible light is incident, and includes a holder 13, a light shielding cylinder 14, a spring member 15, a shaft member 16, and a light shielding body. 12.
[0017]
The holding body 13 is configured to include a first holding piece 18 and a second holding piece 19 which are two holding pieces 18 and 19. The first holding piece 18 is a long member. The second holding piece 19 is a member having a substantially L-shaped cross section in the longitudinal direction. The holding pieces 18 and 19 are connected to each other so as to be angularly displaceable with each other around an angular displacement axis L16 near a middle portion in the longitudinal direction. Each of these holding sides 18 and 19 is configured to be relatively angularly displaced. When one end in the longitudinal direction of each of the holding pieces 18 and 19 abuts against each other, the other end in the longitudinal direction separates from each other. Conversely, when the one end in the longitudinal direction separates from each other, the other end in the longitudinal direction mutually connects. It is configured to abut. One end of each of the holding pieces 18 and 19 in the longitudinal direction abuts on each other in a light blocking state in an annular contact area in a state where they are in contact with each other, and the optical fiber core wire 11 is arranged between these holding pieces. The optical fiber core wire 11 can be held at two places in the contact area.
[0018]
The optical fiber core wire 11 is formed by covering the core with a clad. A plurality of optical fiber core wires 11 are bundled to form a tape wire. In the present embodiment, a single-core wire having one optical fiber core wire 11, a four-core tape wire having four optical fiber core wires 11, and an eight-core tape wire formed by arranging two four-core tape wires are arranged. Is used. In the present embodiment, the optical fiber core wire specifying tool 10 holds such an optical fiber core wire 11 by each holding piece 1 from both sides in the thickness direction, and holds the optical fiber core wire 11 in a curved state in a light shielding space. Is used to identify the optical fiber core wire 11 on which visible light is incident. As a light source of visible light to be incident, for example, a laser diode light source that emits visible light is used, and specifically, a laser diode light source that emits red visible light with a wavelength of about 650 nm is used.
[0019]
FIG. 6 is a plan view showing the guide section 20 in an enlarged manner, and FIG. 7 is a front view showing one end of the guide section 20 in a further enlarged manner. FIG. 8 is an enlarged bottom view showing the grip 21. Referring also to FIGS. 1 to 5, the first holding piece 18 includes a guide portion 20, a grip portion 21, and a fixing screw member 22, which are assembled and configured. The guide portion 20 is made of, for example, a synthetic resin such as polyacetal, and has a guide portion main body 23 and a guide piece 24. The guide portion main body 23 is a substantially rectangular plate-shaped member. A guide piece 24 protruding in one direction in the thickness direction is formed on one surface in the thickness direction at one end in the longitudinal direction of the guide portion main body 23. The first holding piece 18 has an engagement recess 25 formed on one surface in the thickness direction at the other end in the longitudinal direction, and the other end in the longitudinal direction is formed to be thinner than the remaining portion. Further, a guide portion set screw hole 26 which penetrates in the thickness direction and is provided with an internal screw is formed at the other end in the longitudinal direction which is formed thin. Further, the first holding piece 18 has an insertion recess 27 formed on the other surface in the thickness direction at one end in the longitudinal direction, and the one end in the longitudinal direction is formed to be thinner than the remaining portion. Thus, when a plurality of optical fiber cores 11 are bundled, it is easy to insert one end in the longitudinal direction of the first holding piece 18 between the respective optical fiber cores 11, so that the desired optical fiber core 11 is first held. It can be easily arranged at one longitudinal end of the piece 18.
[0020]
The guide piece 24 guides an intermediate portion between the held portions, which is a portion where the optical fiber core wire 11 is held, to a position shifted from a straight line passing through each held portion. Specifically, the guide piece 24 has a skirt portion 24 a at both ends in the width direction, and the skirt portion 24 a is smoothly connected to the guide portion main body 23. The guide piece 24 is formed with a top 24b that is sandwiched between the skirts 24a and protrudes in one direction in the thickness direction. The skirt portion 24a is formed to have a curvature that smoothly protrudes toward the guide portion main body 23. The crown 24b is formed to have a curvature so as to be smoothly convex in one direction in the thickness direction. The surface of the guide piece 24 is formed so as to smoothly connect with one end face in the thickness direction of the guide portion main body 23 in a substantially S-shape. On the surface in the width direction of the guide piece 24 is formed a holding recess 28 that is concave in the other direction in the thickness direction. By abutting the optical fiber core wire 11 over the entire width of the holding recess 28, the optical fiber core wire 11 is uniformly bent without undesired bending. Further, the holding recess 28 allows the optical fiber core wire 11 to be easily arranged, and allows the optical fiber core wire 11 to be held at a suitable position.
[0021]
The guide piece 24 can bend the optical fiber core wire 11 with a radius of curvature such that visible light having a shorter wavelength than the communication light is emitted to the outside without communication light used for optical communication being emitted to the outside. . Specifically, the optical fiber core wire 11 is bent by the guide piece 24 so that the line loss of the communication light is 3 dB or less, which is a value that can neglect the influence on communication, and has a curvature radius at which visible light is emitted to the outside. Is done.
[0022]
Table 1 shows an example of specific dimensions of the cross-sectional shape of the guide piece 24 including the widthwise top part 24b (hereinafter, may be simply referred to as “cross-sectional shape of the guide piece”). Table 2 shows line loss data when a single core wire is bent by each guide piece 24 of Table 1 and communication light is incident from one end. As the communication light, communication light whose line loss is likely to be large due to bending is used, and specifically, communication light having a wavelength of about 1.55 μm is used. As the line loss data, the line loss for each number of experiments, the average value, the maximum value, the minimum value, and the domain which is the difference between the maximum value and the minimum value are shown. Table 3 shows the line loss of the 4-core tape line as in Table 2, and Table 4 shows the line loss of the 8-core tape line. Table 5 summarizes the line losses of Tables 2-4.
[0023]
[Table 1]

[0024]
[Table 2]

[0025]
[Table 3]

[0026]
[Table 4]

[0027]
[Table 5]

[0028]
As shown in Table 1, there are 16 types of cross-sectional shapes of the guide piece 24, a projection length h1, which is a dimension in a thickness direction from the guide portion main body 23 to the crown 24b, a curvature radius R1 of the crown, and a curvature of the skirt 24a. The radius R2 is changed. In type 1, h1 is 4.5 mm, R1 is 6 mm, and R2 is 5.5 mm. From type 2 to type 6, h1 of type 1 is sequentially increased at 0.5 mm intervals. R1 of type 6 is sequentially reduced at intervals of 0.1 mm from type 7 to type 11. From type 12 to type 16, R1 of type 11 is reduced at intervals of 0.5 mm and R2 of type 11 is increased at intervals of 0.5 mm.
[0029]
As shown in Tables 2 to 5, since the line loss varies depending on the type of the guide piece 24 and the bending strength varies depending on the number of the optical fiber core wires 11, the single core wire, the four core tape wire, and the eight core tape wire are mutually different. Line loss is different. Here, as the suitable type of the guide piece 24, a type of line loss that can have negligible effect on optical communication is selected. For example, a type having a maximum line loss of 3 dB or less and a variation of 1 dB or less is selected. You. Therefore, with regard to the single core wire, type 8 is selected according to the above-described conditions in order to consider the safety side. As for the four-core tape wire, similar to the single-core wire, type 11 is selected for consideration on the safety side. As for the eight-core tape wire, the conditions are satisfied in all types, so the same type 11 as the four-core tape wire is selected.
[0030]
The grip portion 21 is made of, for example, a synthetic resin such as polyacetal, and has a roughly elongated rectangular plate-like grip portion main body 29 and two wall bodies 30 protruding in the thickness direction from both widthwise side portions of the grip portion main body 29. And The gripper body 29 is formed with a gripper set screw hole 31 that penetrates in the thickness direction and has an internal screw cut therein. The wall 30 has a first shaft hole 32 formed therethrough in the thickness direction of the gripper body 29.
[0031]
The grip portion 21 is detachably attached to the other end in the longitudinal direction of the guide portion 20 from one side in the thickness direction. Specifically, the grip portion 21 is fitted into the holding recess 1 with the wall 30 disposed on the guide portion main body 23 side. A fixing screw member 22 in which an external thread is engraved is inserted into the gripping set screw hole 31 on one side in the thickness direction, and the fixing screw member 22 is guided by the guide portion in a state where the head is locked to the guide portion 20. The holding portion 21 is fixed to the guide portion 20 by screwing to the guide portion 20 using the set screw hole 26. The holding screw hole 31 and the guide screw hole 26 are formed in a plurality of positions along the longitudinal direction of each of the portions 21 and 20, and are formed at two places in the present embodiment, and around the fixing screw member 22 of the holding portion 21 with respect to the guide portion 20. Is prevented.
[0032]
FIG. 9 is an enlarged sectional view showing the light-shielding cylinder 14, the second holding piece 19 and the light-shielding body 12, and FIG. 10 is a plan view showing the light-shielding cylinder 14 and the second holding piece 19 in an enlarged manner. FIG. FIG. 11 is a plan view showing the light shield 12. Referring also to FIGS. 1 to 5, the light shielding cylindrical body 14 and the second holding piece 19 are formed integrally. The second holding piece 19 is made of a synthetic resin such as polyacetal, for example, is a member having a substantially L-shaped cross section in the longitudinal direction, and includes a light shielding portion 33, a contact portion 34, and a pressing portion 35. You. The light-shielding part 33 is substantially cylindrical, and a confirmation window 37 through which visible light can pass is formed at the other end in the axial direction of the light-shielding part 33.
[0033]
The contact portion 34 has a substantially square plate shape, and has a through hole 36 penetrating in the thickness direction. The through-hole 36 is on a substantially truncated cone, and is formed in a tapered shape so as to increase in diameter from one end in the thickness direction to the other end in the thickness direction. The other end surface in the thickness direction can be brought into contact with the surface of the guide portion main body 23 around the guide piece 24 of the first holding edge 18 in an annular contact region in a light-shielded state. The inner diameter of the through hole 36 at one end surface in the thickness direction of the contact portion 34 is formed to be equal to the inner diameter of one axial end of the light shielding portion 33. When the axes of the contact portion 34 and the light-shielding portion 33 are coaxial, one end surface in the axial direction of the light-shielding portion 33 is in contact with one end surface in the thickness direction of the contact portion 34 in a light-shielded state, and is integrally formed. Thus, in a state where the contact portion 34 and the guide portion 20 are in contact with each other, the confirmation window 37 which is the other end in the axial direction of the light shielding portion 33 is located at a position facing an intermediate portion between the portions to be clamped. Is closed to form a light-shielding space.
[0034]
The pressing portion 35 is substantially in the shape of a long rectangular plate, and a second shaft hole 38 penetrating in the width direction is formed in the middle portion in the longitudinal direction. The pressing portion 35 has a spring fitting recess 39 which is opened on one side in the thickness direction on a surface portion on one side in the thickness direction. One end surface in the longitudinal direction of the pressing portion 35 abuts on one side surface of the contact portion 34 in a state in which both end surfaces in the thickness direction of the pressing portion 35 are inclined with respect to one side surface portion of the abutting portion 34. Formed.
[0035]
The light-shielding cylinder 14 is made of, for example, a synthetic resin such as polyacetal, and is formed in a substantially cylindrical shape capable of blocking visible light. The thickness of the light shielding portion 33 is constant, and is formed in a tapered shape so that the diameter increases from one end in the axial direction toward the other end in the axial direction. The inside diameter of one end in the axial direction of the light shielding cylinder 14 is formed to be equal to the inside diameter of the light shielding part 33. When the axes of the light-shielding cylinder 14 and the light-shielding portion 33 are coaxial, one axial end face of the light-shielding cylinder 14 is connected to the other axial end face of the light-shielding portion 33 in a light-shielded state and is integrally formed. Since the light-shielding cylinder 14 is formed in a tapered shape, the operator can easily confirm one end in the axial direction by looking at the other end in the axial direction.
[0036]
The light shield 12 has a substantially square plate shape, and has a light shield hole 40 that penetrates in a columnar shape in the thickness direction. The light-shielding body 12 contacts the light-shielding state in the contact area in a state where one end in the longitudinal direction of each of the holding pieces 18 and 19 is in contact with each other and holds the optical fiber core wire 11. 11 is selected so as to elastically hold 11. The light shield 12 is made of, for example, sponge rubber, and specifically, is made of an ethylene propylene (abbreviation: EPDM) rubber foam, Epto Sealer (registered trademark), or the like. The inside diameter of the light blocking body hole 40 is formed to be equal to the inside diameter of the through hole 36 at the other axial end portion of the light blocking portion 33. With the axes of the light-shielding body 12 and the abutting portion 34 coaxial, one end in the thickness direction of the light-shielding body 12 abuts on the other end in the axial direction of the abutting portion 34 and is mechanically connected via an adhesive. I do. The light shielding body 12 easily forms a light shielding space.
[0037]
Each of the holding pieces 18 and 19 further has one end in the thickness direction of the grip portion 21 so that the guide piece 24 of the first holding piece 18 is inserted into the through hole 36 of the contact portion 34 of the second holding piece 19. The surface portion and one end surface portion in the thickness direction of the pressing portion 35 are disposed so as to face each other. In such a state, the shaft member 16 is provided in such a manner that the axis of the shaft member 16 is aligned with the axis of each of the shaft holes 32 and 38 in each of the holding pieces, and is inserted through the shaft holes 32 and 38 in common. By the shaft member 16, each of the holding pieces is connected so as to be angularly displaceable about an angular displacement axis L <b> 16 coincident with the axis of the shaft member 16.
[0038]
The shaft member 16 is a cylindrical member, and is provided with an internal screw and an outward flange 16a at one end in the axial direction. A shaft holding screw member 17 on which an external thread is engraved is screwed to the shaft member 16. A first holding piece is formed by the outward flange 16 a of the shaft member 16 and the head of the shaft fixing screw member 17. The eighteen wall bodies 30 are sandwiched together. As a result, the shaft member 16 is prevented from coming off, and undesired displacement of each of the holding pieces 18, 19 is prevented, so that each of the holding pieces 18, 19 is smoothly angularly displaced around the angular displacement axis L16. it can.
[0039]
The spring member 15 generates a pressing force, specifically, a spring force, in which the other end in the thickness direction of the contact portion 34 of the second holding piece 19 contacts one end in the longitudinal direction of the first holding piece 18. The pressing force generating means is realized by, for example, a torsion coil spring in the present embodiment. The spring member 15 is fitted in a spring fitting recess 39 formed in the pressing portion 35 of the second holding piece 19, and is provided in a state where the shaft member 16 is inserted. In this state, both ends of the spring member 15 are resiliently brought into contact with the holding pieces 18 and 19, and a separating spring force is applied to the holding pieces 18 and 19.
[0040]
When no operation force is applied by the operator, the optical fiber core wire specifying tool 10 causes the second holding piece 19 to contact the one end of the first holding piece 18 in the longitudinal direction by the spring force of the spring member 15. The contact portion 34 is in a state in which the other end surface in the thickness direction is in contact (hereinafter, may be simply referred to as “contact state”). From this contact state, an operating force larger than the spring force is applied, so that one end face in the thickness direction of the grip portion 21 of the first holding piece 18 is attached to one end face in the thickness direction of the pressing portion 35 of the second holding piece 19. It is angularly displaced around the angular displacement axis L16 so as to abut. Thus, a state in which the one end portion in the longitudinal direction of the first holding piece 18 and the other end surface in the thickness direction of the abutting portion 34 of the second holding piece 19 are separated from the contact state (hereinafter simply referred to as a “separated state”). "). When the operating force is released from the separated state, each of the holding pieces 18 and 19 is angularly displaced around the angular displacement axis L16 by the spring force of the spring member 15 to be brought into a contact state. The spring force of the spring member 15 is set so that the optical fiber core wire 11 is not undesirably deformed when the optical fiber core wire 11 is held in the contact state, and the contact area is abutted in a light-shielded state. To be selected.
[0041]
As an example, the dimension of the optical fiber core wire specifying tool 10 is such that the length L1 in the longitudinal direction of the grip portion 21 of the first holding piece 18 is about 105 mm, and the width W1 of the other end in the longitudinal direction is about 105 mm. 25 mm. The length L2 in the longitudinal direction of the guide portion main body 23 of the first holding piece 18 is about 66 mm. The length L3 in the axial direction of the light-shielding cylinder 14 is about 55 mm, the inner diameter D1 at one end in the axial direction is about 10 mm, and the inner diameter D2 at the other end in the axial direction is about 20 mm. The thickness T1 of the contact portion 34 of the second holding piece 19 is about 5 mm, and the inner diameter D3 at one end in the axial direction is about 20 mm. The dimensions are merely an example, and the dimensions of the gripping portion 21 of the first holding piece 18 and the pressing portion 35 of the second holding piece are such that the worker can easily work with one hand. It is formed to the possible dimensions. In addition, the length L3 and the inner diameter D1 of the light-shielding cylinder are formed so as to easily confirm whether visible light is emitted from the optical fiber core wire 11 or not.
[0042]
In the optical fiber core wire specifying tool 10, at least the member forming the light shielding space is selected to have a color that easily absorbs visible light and hardly diffusely reflects, for example, black. Thus, the operator can easily confirm that visible light is emitted from the optical fiber core wire 11 to the outside.
[0043]
In the present embodiment, the holder 13 inserts and holds the optical fiber core wire 11 in a light-shielding space in a curved state. When visible light enters the optical fiber core wire 11 held in a curved state, the visible light is emitted to the outside. Therefore, the operator can check the emission state of the visible light through the check window 37. In addition, visible light is incident on a plurality of optical fiber core wires 11 from a predetermined reference position, and the plurality of optical fiber core wires 11 are sequentially curved and held at a work position different from the reference position, so that the incident visible light is The optical fiber core wire 11 corresponding to the light can be specified at the work position. Therefore, the optical fiber core wire specifying tool 10 can realize the optical fiber core wire 11 into which visible light is incident with a simple configuration without using an electronic component such as a photodetector.
[0044]
Further, in the present embodiment, holding body 13 holds optical fiber core wire 11 without causing communication light to be emitted to the outside, and by bending at a radius of curvature at which visible light is emitted to the outside. Therefore, even if the optical fiber core wire 11 on which the communication light is incident is bent using the optical fiber core wire identification tool 10, the communication light is not emitted to the outside, so that there is no obstacle to communication. Therefore, even when communication light is incident on at least one of the plurality of optical fiber core wires 11, the optical fiber that is sequentially curved and receives visible light without impeding communication. The core wire 11 can be specified.
[0045]
In this embodiment, the holding body 13 has two holding pieces 18 and 19, and the optical fiber core wire 11 can be held between the holding pieces 18 and 19. The check window 37 is closed in a state where the holding pieces 18 and 19 are in contact with each other in the annular contact area, thereby forming a light shielding space. A guide piece 24 is formed on one of the first holding pieces 18 to guide an intermediate portion between the held portions to a position shifted from a straight line passing through each held portion. Thereby, the optical fiber core wire 11 can be held in a curved state by disposing the optical fiber core wire 11 between the portions to be held and holding the optical fiber core wire 11 by the holding pieces 18 and 19. Further, since the other second holding piece 19 has a confirmation window 37 facing the intermediate portion between the held portions of the optical fiber core wire 11, the optical fiber core wire 11 in a curved state by the guide piece 24 is formed. It can be confirmed from the confirmation window 37. Thereby, the operator can specify the optical fiber core wire 11 into which the visible light is incident by an easy operation.
[0046]
Further, in the present embodiment, the light-shielding tubular body 14 is formed in a tubular shape capable of blocking visible light, and one end is connected to the holder 13 in a light-shielded state. Since such a light-shielding cylinder 14 is connected, the light-shielding space formed by closing both ends of the light-shielding cylinder 14 is connected to the light-shielding space formed by the holder 13, and the optical fiber core wire is specified. The light shielding space formed in the holder 10 can be expanded. The other end of the light-shielding cylinder 14 can check the light-shielding space through a check window 37. Therefore, the optical fiber core 11 can be confirmed at least at a position away from the position where the holder 13 holds the optical fiber core 11 by the axial dimension of the light shielding cylinder 14. Thus, a distance at which the operator can easily focus on the optical fiber core wire 11 held in a curved state can be secured by shielding light. Therefore, convenience can be improved.
[0047]
FIG. 12 is a front view showing an optical fiber core wire specifying tool 50 according to another embodiment of the present invention, and FIG. 13 is a side view showing the optical fiber core wire specifying tool 50. FIG. 14 is an exploded side view showing the optical fiber core wire specifying tool 50. 12 and 14 omit the light shield 12 for easy understanding. The present embodiment is similar to the optical fiber core wire specifying tool 10 of FIGS. 1 to 11 described above, and the configuration of the present embodiment has the same reference numerals as the corresponding components of the optical fiber core wire specifying tool 10. , Only different configurations will be described, and description of similar configurations will be omitted. The optical fiber core wire specifying tool 50 of the present embodiment is different from the above-described optical fiber core wire specifying tool 10 in the configuration of the second holding piece 51 and the configuration of the light shielding cylinder 52.
[0048]
FIG. 15 is an enlarged cross-sectional view of the second holding piece 51 of the present embodiment, FIG. 16 is a bottom view showing the second holding piece 51 in an enlarged manner, and FIG. It is a side view which expands and shows 2 holding pieces 51. The second holding piece 51 of the present embodiment is similar to the remaining portion of the second holding piece 19 except for the light shielding portion 33. The contact portion 53 of the second holding piece 51 penetrates in a thickness direction in a peripheral region where the through hole 36 is formed, and a countersunk screw hole 54 in which an internal screw is engraved is formed. Four countersunk screw holes 54 are formed in a region around the through hole 36 at positions that are equally divided in the circumferential direction.
[0049]
FIG. 18 is an enlarged plan view showing a first connection portion 55 constituting the light-shielding tubular body 52 of the present embodiment, and FIG. 19 is a bottom view showing the first connection portion 55 in an enlarged manner. FIG. 20 is an enlarged bottom view showing the tightening portion 56 constituting the light shielding cylinder 52. FIG. 21 is an enlarged bottom view of the insertion portion 67 constituting the light-shielding cylinder 52. FIG. 22 is an enlarged plan view showing a second connection portion 57 constituting the light-shielding cylinder 52, and FIG. 23 is a bottom view showing the second connection portion 57 in an enlarged manner. FIG. 24 is a cross-sectional view showing the check part 58 constituting the light-shielding cylinder 52 cut in a plane parallel to the width direction and enlarged, and FIG. 25 is a sectional view of the check part 58 cut in a plane perpendicular to the width direction. FIG. 4 is an enlarged cross-sectional view. FIG. 26 is an enlarged plan view showing the confirmation unit 58, and FIG. 27 is a bottom view showing the confirmation unit 58 in an enlarged manner. The light-shielding cylinder 52 includes a first connection portion 55, a fastening portion 56, an insertion portion 67, a second connection portion 57, a second connection screw member, and a confirmation portion 58.
[0050]
The first connection portion 55 is formed to include a first connection portion main body 60 having a square plate shape and an engagement claw 62. The first connection portion main body 60 has a first transmission hole 61 formed therethrough in the thickness direction. The inner diameter of the first transmission hole 61 is formed to be equal to the inner diameter of the through hole 36 at one end surface in the thickness direction of the contact portion 53. The first connection portion main body 60 is concave at one end surface in the thickness direction toward the center in the thickness direction, and has four first screw holes 63 at the corners where the internal screws are carved. Further, engaging claws 62 are formed on the other end face in the thickness direction from four corners to protrude outward in the thickness direction. With the axes of the contact portions 53 of the first connecting portion 55 and the second holding piece 51 being coaxial, one end surface in the thickness direction of the first connecting portion 55 is brought into contact with one end surface in the thickness direction of the contact portion 53. . In the contact state, a first connection screw member 64 in which an external thread is engraved is inserted into the countersunk screw hole 54 on the other side in the thickness direction. The first connection hole 55 is screwed to the first connection portion 55 using the first transmission hole 61 in a state where the contact portion 53 is locked, and the contact portion 53 is fixed to the first connection portion 55.
[0051]
The fastening portion 56 includes a fastening portion main body 65 and a chuck member 66. The fastening portion main body 65 is a substantially cylindrical member, and a chuck structure is formed at one end in the axial direction. One end in the axial direction of the tightening portion main body 65 is divided into a plurality in the circumferential direction, is formed so as to be displaceable in the radial direction, and is provided with an external screw. The chuck member 66 has a cylindrical shape, and is provided with an internal screw that can be screwed with the external screw of the fastening portion 56. The chuck member 66 is screwed onto the tightening portion main body 65, and is screwed and retreated, and is displaced in the axial direction with respect to the tightening portion main body 65. Displace radially. The other end in the axial direction of the tightening portion 56 is engaged with the engaging claw 62 of the first connecting portion 55, and is further bonded and mechanically connected using an adhesive.
[0052]
The insertion section 67 is a cylindrical member. The outer diameter of the insertion portion 67 is formed so as to circumscribe the inner diameter of the tightening portion body 65 in the natural state and to be shifted from the tightening portion 56 in the axial direction. One end of the insertion portion 67 in the axial direction is inserted from the one end of the fastening portion 56 in the axial direction, and one end of the fastening portion body 65 in the axial direction is displaced inward in the radial direction by using the chuck member 66 to tighten. The inner peripheral portion of the attachment main body 65 is brought into contact with the outer peripheral portion of the insertion portion 67. Thus, the insertion portion 67 can be fixed to the fastening portion 56 at an arbitrary position in the axial direction, and the dimension of the light-shielding cylinder 52 in the axial direction can be changed to an arbitrary value. Therefore, the axial dimension of the light shielding cylinder 52 can be adjusted so that the operator can easily check the optical fiber core wire 11.
[0053]
The second connection portion 57 includes a second connection portion main body 69 and a second connection portion cylindrical body 70. The second connection main body 2 has a substantially elliptical plate shape, and a second transmission hole 71 penetrating in the thickness direction is formed at the center in the width direction. The inner diameter of the second transmission hole 71 is formed smaller than the inner diameter of the fastening portion 56. Further, the second connection portion main body 69 has a second screw hole 74 penetrating in the thickness direction at both ends in the width direction and in which an internal screw is engraved. The second connecting portion cylindrical body 70 is a cylindrical member, and has an inner diameter equal to the outer diameter of the insertion portion 67. When the axes of the second connecting portion main body 69 and the second connecting portion cylindrical body 70 are coaxial, one end surface in the axial direction of the second connecting portion cylindrical body 70 abuts on one end surface in the thickness direction of the second connecting portion main body 69. And are integrally formed. With the axis of the second connecting portion cylinder 70 and the insertion portion 67 being coaxial, the other end of the second connecting portion cylinder 70 in the axial direction is bonded to the other end of the insertion portion 67 in the axial direction using an adhesive. Connected mechanically.
[0054]
The confirmation portion 58 is a substantially bottomed cylindrical shape whose one end in the axial direction is closed, and has a substantially elliptical cross section perpendicular to the axial direction. The open end, which is the other end in the axial direction, is formed in a concave shape that is concave toward the bottom from the middle in the long side direction. The open end is formed in a short side direction, and both ends are formed in a convex shape protruding outward in the axial direction from the intermediate part. As a result, the open end is easily formed to follow the shape around the eyes of the operator. A confirmation hole 72 penetrating in the axial direction is formed at the center of the bottom portion, which is one end in the axial direction. The inner diameter of the confirmation hole 72 is formed to be equal to the inner diameter of the second transmission hole 71 of the second connection portion main body 69. In addition, the bottom surface portion is a concave portion toward the open end side in the axial direction at both ends in the long side direction, and a confirmation portion screw hole 73 in which an internal screw is formed is formed. With the axes of the checking portion 58 and the second connecting portion 57 being coaxial, the bottom portion of the checking portion 58 is brought into contact with the other end of the second connecting portion 57 in the axial direction. In the abutted state, a second connection screw member 59 in which an external thread is engraved is inserted into the second screw hole 74 on the other side in the axial direction, and the second connection screw member 59 is inserted into the second connection hole 74 at the head. The second connection portion 57 is fixed to the confirmation portion 58 by being screwed to the confirmation portion 58 using the confirmation portion screw hole 73 in a state of being locked by the portion 57.
[0055]
According to the optical fiber core wire specifying tool 50 of the present embodiment, the optical fiber core wire 11 can be specified. Therefore, the same effects as those of the optical fiber core wire specifying tool 10 of the above-described embodiment can be achieved.
[0056]
FIG. 28 is a front view showing an optical fiber core specifying tool 80 according to still another embodiment of the present invention, and FIG. 29 is a side view showing the optical fiber core specifying tool 80. FIG. 30 is an exploded front view showing the optical fiber core wire specifying tool 80. FIG. 31 is an exploded side view showing the optical fiber core wire specifying tool 80. 28 to 31 omit the light shielding body 12 for easy understanding. This embodiment is similar to the optical fiber core wire specifying tools 10 and 50 of FIGS. 1 to 27 described above, and the configuration of this embodiment is the same as the corresponding configuration of the optical fiber core wire specifying tools 10 and 50. The same reference numerals are given and only different configurations will be described, and description of similar configurations will be omitted. The optical fiber core wire specifying tool 80 of the present embodiment is different from the above-described optical fiber core wire specifying tool 50 in the configuration of the light shielding cylinder 81 and the configuration of the first holding piece 82.
[0057]
FIG. 32 is an enlarged plan view showing a connection portion 83 constituting the light-shielding tubular body 81 of the present embodiment, and FIG. 33 is a bottom view showing the connection portion 83 in an enlarged manner. The light-shielding cylinder 81 of the present embodiment includes the engagement claws 62 of the first connection part 55, the fastening part 56, the insertion part 67, and the second connection part of the second connection part 57, which constitute the light-shielding cylinder 52 described above. It is composed of the remaining part excluding the cylindrical body 70. The light-shielding cylinder 81 is configured to include a connection part 83 and a confirmation part 58. The connection part 83 is configured to include a connection part main body 84 and a connection part bottom body 85. The connecting portion main body 84 is similar to the second connecting portion main body 69 constituting the second connecting portion 57 described above. The connection portion bottom body 85 is similar to the first connection portion main body 60 constituting the first connection portion 55 described above. The connecting portion main body 84 and the connecting portion bottom body 85 are integrally formed with the axes thereof coaxial. Similarly to the above-described optical fiber core wire specifying tool 50, the connecting portion main body 84 is mechanically connected to the checking portion 58, and the connecting portion bottom body 85 is mechanically connected to the second holding piece 51 and fixed. Accordingly, the number of components constituting the light shielding cylinder 81 can be reduced as compared with the above-described optical fiber core wire specifying tool 50, and the weight can be reduced.
[0058]
FIG. 34 is an enlarged plan view showing a guide portion 86 constituting the first holding piece 82 of the present embodiment. The guide portion 86 of the present embodiment is different from the above-described guide portion 20 in that a guide piece 87 is formed, and the insertion recess 27 is not formed. The guide piece 87 has a top portion 88 formed at the center in the width direction of the guide portion 86 so as to protrude in one direction in the thickness direction. The top portion 88 is formed on a flat surface parallel to the width direction of the guide portion 86. The guide piece 87 is formed to extend in the longitudinal direction, and has a substantially trapezoidal sectional shape in the longitudinal direction and a sectional shape in the width direction. Thus, the optical fiber core wire 11 can be bent by holding the optical fiber core wire 11 between the first holding piece 82 and the second holding piece 51. Further, by changing the width and the protruding height of the bottom surface of the guide piece 87, the optical fiber core wire 11 can be appropriately curved.
[0059]
According to the optical fiber core wire specifying tool 80 of the present embodiment, the optical fiber core wire 11 can be specified. Therefore, the same effects as those of the optical fiber core wire specifying tools 10 and 50 of the above-described embodiment can be achieved.
[0060]
FIG. 35 is a side view showing a contact portion 92 of a first holding piece 91 constituting an optical fiber core wire specifying tool 90 according to still another embodiment of the present invention, and FIG. FIG. This embodiment is similar to the optical fiber core wire identifying tools 10, 50, and 80 of FIGS. 1 to 34 described above, and the configuration of the present embodiment includes the optical fiber core wire identifying tools 10, 50, and 80. The same reference numerals are given to the corresponding components, and only different components will be described, and description of similar components will be omitted. The optical fiber core wire specifying tool 90 of the present embodiment is different from the optical fiber core wire specifying tool 80 in the configuration of the first holding piece 91.
[0061]
The guide portion 93 forming the first holding piece 91 of the present embodiment is different, and specifically, the guide piece 94 formed on the guide portion 93 is different. The guide piece 94 has a top portion 4 that projects in one direction in the thickness direction at the center in the width direction of the guide portion 93. The top part 4 is formed flat and parallel to the width direction of the guide part 93. The guide piece 94 is formed so as to extend in the longitudinal direction, and the sectional shape in the longitudinal direction and the sectional shape in the width direction are formed in a substantially rectangular shape. Thus, the optical fiber core wire 11 can be curved by holding the optical fiber core wire 11 between the first holding piece 91 and the second holding piece 51. Also, by changing the width and the protruding height of the guide piece 94, the optical fiber core wire 11 can be appropriately curved.
[0062]
According to such an optical fiber core wire specifying tool 90 of the present embodiment, the optical fiber core wire 11 can be specified. Therefore, the same effects as those of the optical fiber core wire specifying tools 10, 50, and 80 of the above-described embodiment can be achieved.
[0063]
FIG. 37 is a flowchart showing the process of specifying the optical fiber core using the optical fiber core specifying tool. In step a0, when the process of specifying the optical fiber core wire 11 is started, in step a1, visible light is incident on a predetermined optical fiber core wire 11 from a predetermined reference position using, for example, a laser diode light source. Proceed to a2. In step a2, the optical fiber core wire 11 is arranged in a light shielding space at a position different from the reference position, and the process proceeds to step a3. By arranging the optical fiber core wire 11 in the light shielding space, it is possible to easily confirm the light emission state in the middle of the optical fiber core wire 11. In step a3, the optical fiber core wire 11 is bent at a radius of curvature at which the communication light used for optical communication does not exit to the outside and the visible light exits to the outside, and the process proceeds to step a4. Since the optical fiber is curved at the curvature radius, the optical fiber core wire 11 on which the visible light is incident can be curved and the visible light can be emitted to the outside without affecting the optical communication. In step a4, the operator can visually confirm the curved portion of the optical fiber core wire 11 to specify the optical fiber core wire 11 on which visible light is incident, and proceed to step a5 to specify the optical fiber core wire 11. Finish the work.
[0064]
In the present embodiment, the optical fiber core wire 11 is curved at a position different from the reference position with a radius of curvature at which the communication light does not exit to the outside and the visible light incident from the reference position exits to the outside. As a result, when the optical fiber core 11 on which the visible light is incident is specified, even if the optical fiber core 11 on which the communication light is incident is bent by mistake, the communication light is not emitted to the outside. Never give. In addition, since the incident visible light is emitted to the outside, the curved optical fiber core wire 11 is arranged in a light-shielding space, and by visually checking, it is possible to specify the optical fiber core wire to which the visible light is incident. it can. Therefore, it is possible to easily specify the optical fiber core wire 11 on which the visible light is incident.
[0065]
【The invention's effect】
As described above, according to the present invention, the holder inserts and holds the optical fiber core wire in the light shielding space in a curved state. When visible light enters the optical fiber core held in a curved state, the visible light is emitted to the outside. Therefore, the operator can confirm the emission state of visible light through the confirmation window. In addition, visible light is incident on a plurality of optical fiber cores from a predetermined reference position, and in a working position different from the reference position, the plurality of optical fiber cores are sequentially curved and held, so that the incident visible light is The corresponding optical fiber core can be identified at the working position. Therefore, the optical fiber core wire specifying tool can realize the optical fiber core wire on which visible light is incident with a simple configuration without using electronic components such as a photodetector.
[0066]
Further, according to the present invention, the holding member holds the optical fiber core by curving the communication light without emitting the communication light to the outside and at the radius of curvature by which the visible light is emitted to the outside. Therefore, even if the optical fiber core wire on which the communication light is incident is curved by using the optical fiber core wire specifying tool, the communication light is not emitted to the outside, so that communication is not hindered. Therefore, even when communication light is incident on at least one of the plurality of optical fiber cores, the optical fiber cores are sequentially curved without impairing communication, and visible light is incident thereon. Can be specified.
[0067]
According to the invention, the holding body has two holding pieces, and the optical fiber core wire can be held between the holding pieces. The check window is closed in a state where the holding pieces are in contact with each other in the annular contact area, thereby forming a light shielding space. Further, one holding piece is provided with a guide means for guiding an intermediate portion between the held portions to a position shifted from a straight line passing through each held portion. Thus, the optical fiber core wire can be held in a curved state by arranging the optical fiber core wire between the portions to be held and holding the optical fiber core wire by each holding piece. Further, since the other holding piece has a confirmation window facing the intermediate portion between the held portions of the optical fiber core wire, the optical fiber core wire in a curved state can be confirmed from the confirmation window by the guide means. it can. Thereby, the operator can specify the optical fiber core wire on which the visible light is incident by an easy operation.
[0068]
Further, according to the present invention, the light-shielding tubular body is formed in a tubular shape capable of blocking visible light, and one end is connected to the holder in a light-shielded state. Since such a light-shielding cylinder is connected, the light-shielding space formed by closing both ends of the light-shielding cylinder is connected to the light-shielding space formed by the holder, and the optical fiber core wire specifying holder is connected. The light-shielding space formed in the area can be expanded. The other end of the light-shielding cylinder can check the light-shielding space through a check window. Therefore, the optical fiber core wire can be confirmed at least at a position away from the position where the holder holds the optical fiber core wire at the axial dimension of the light shielding cylinder. Thus, a distance at which the operator can easily focus on the optical fiber core wire held in a curved state can be secured by shielding light. Therefore, convenience can be improved.
[0069]
Further, according to the present invention, the optical fiber core wire is curved at a position different from the reference position at a radius of curvature at which the communication light does not exit to the outside and the visible light incident from the reference position exits to the outside. Thus, when specifying the optical fiber core wire on which the visible light is incident, even if the optical fiber core wire on which the communication light is incident is bent by mistake, the communication light is not emitted to the outside, so that communication is impaired. Nothing. Further, since the incident visible light is emitted to the outside, the curved optical fiber core wire is arranged in the light shielding space, and by visually checking, the optical fiber core wire to which the visible light is incident can be specified. . Therefore, it is possible to easily identify the optical fiber core wire on which the visible light is incident.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state where an optical fiber core wire 11 is held by an optical fiber core wire specifying tool 10 according to an embodiment of the present invention.
FIG. 2 is a front view showing the optical fiber core wire specifying tool 10. FIG.
FIG. 3 is a side view showing the optical fiber core wire specifying tool 10.
FIG. 4 is an exploded front view of the optical fiber core wire specifying tool 10. FIG.
FIG. 5 is an exploded side view showing the optical fiber core wire specifying tool 10.
FIG. 6 is an enlarged plan view showing a guide portion 20 constituting the first holding piece 18. FIG.
FIG. 7 is a front view showing one end of the guide section 20 in a further enlarged manner.
FIG. 8 is an enlarged bottom view showing a grip 21 constituting the first holding piece 18;
FIG. 9 is a cross-sectional view showing, on an enlarged scale, the light shielding cylinder 14, the second holding piece 19, and the light shielding body 12.
FIG. 10 is an enlarged plan view showing a light-shielding cylinder 14 and a second holding piece 19;
FIG. 11 is a plan view showing the light shielding body 12. FIG.
FIG. 12 is a front view showing an optical fiber core wire specifying tool 50 according to another embodiment of the present invention.
FIG. 13 is a side view showing the optical fiber core wire specifying tool 50.
14 is an exploded side view showing the optical fiber core wire specifying tool 50. FIG.
FIG. 15 is an enlarged sectional view showing a second holding piece 51;
FIG. 16 is an enlarged bottom view showing a second holding piece 51;
FIG. 17 is an enlarged side view showing the second holding piece 51;
FIG. 18 is an enlarged plan view showing a first connection portion 55 constituting the light shielding cylinder 52.
FIG. 19 is a bottom view showing the first connection portion 55 in an enlarged manner.
FIG. 20 is an enlarged bottom view showing a fastening portion 56 constituting the light shielding cylinder 52.
21 is an enlarged bottom view showing an insertion portion 67 constituting the light-shielding cylinder 52. FIG.
FIG. 22 is an enlarged plan view showing a second connection portion 57 constituting the light-shielding cylinder 52.
FIG. 23 is a bottom view showing the second connection portion 57 in an enlarged manner.
FIG. 24 is a cross-sectional view showing, in an enlarged manner, a confirmation section 58 constituting the light-shielding cylinder 52, cut along a plane parallel to the width direction.
FIG. 25 is a cross-sectional view illustrating the check unit 58 cut along a plane perpendicular to the width direction and enlarged.
FIG. 26 is an enlarged plan view showing a confirmation unit 58;
FIG. 27 is an enlarged bottom view showing a confirmation unit 58;
FIG. 28 is a front view showing an optical fiber core wire specifying tool 80 according to still another embodiment of the present invention.
29 is a side view showing an optical fiber core wire specifying tool 80. FIG.
30 is an exploded front view showing the optical fiber core wire specifying tool 80. FIG.
31 is an exploded side view of the optical fiber core wire specifying tool 80. FIG.
FIG. 32 is an enlarged plan view showing a connection portion 83 constituting the light shielding cylinder 81.
FIG. 33 is a bottom view showing the connection portion 83 in an enlarged manner.
34 is an enlarged plan view showing a guide portion 86 constituting the first holding piece 82. FIG.
FIG. 35 is a side view showing a contact portion 92 of a first holding piece 91 constituting an optical fiber core wire specifying tool 90 according to still another embodiment of the present invention.
36 is a plan view showing a contact portion 92. FIG.
FIG. 37 is a flowchart showing a process of specifying an optical fiber core using an optical fiber core specifying tool.
FIG. 38 is a perspective view showing a conventional optical fiber core wire specifying tool 1.
[Explanation of symbols]
10,50,80,90 Optical fiber core wire specification tool
11 Optical fiber core wire
13 Holder
14 Shading cylinder
18 1st holding piece
19 2nd pinch
24 Guide pieces
37 Confirmation window

Claims (5)

A confirmation window capable of transmitting visible light is formed, and a light-blocking space for blocking visible light is formed by closing the confirmation window. An optical fiber core wire specifying tool comprising: The holding body is configured to hold the optical fiber core wire without causing communication light used for optical communication to be emitted to the outside, and having a curvature radius at which visible light having a shorter wavelength than the communication light is emitted to the outside. 2. The optical fiber core wire specifying tool according to claim 1, wherein: The holder is
It has two holding pieces provided so as to be able to come into contact with and separate from each other, and each holding piece comes into contact with each other in a light blocking state in an annular contact area, and an optical fiber core wire is provided between these holding pieces. By arranging, it is possible to sandwich the optical fiber core wire at two places in the contact area,
On one of the holding pieces, a guide piece for guiding an intermediate portion between the held portions, which is a portion where the optical fiber core wire is held, to a position shifted from a straight line passing through each held portion, is formed.
The optical fiber core wire specifying tool according to claim 1, wherein a confirmation window facing an intermediate portion between the held portions of the optical fiber core wire is formed in the other holding piece. It is formed in a tubular shape capable of blocking visible light, one end is connected to the holding member in a light-shielded state, and further includes a light-shielding tubular body capable of confirming a light-blocking space from the other end through a confirmation window. The optical fiber core wire specifying tool according to claim 1. Visible light is incident on a predetermined optical fiber core from a predetermined reference position,
At a position different from the reference position, the optical fiber core wire is arranged in a light-shielding space, and the communication light used for optical communication does not exit to the outside, and the visible light is curved at a radius of curvature at which the visible light exits to the outside. And visually confirming the optical fiber core wire.

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