JP2006146084A - Structure and method to mount ferrule of optical fiber - Google Patents

Structure and method to mount ferrule of optical fiber Download PDF

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JP2006146084A
JP2006146084A JP2004339482A JP2004339482A JP2006146084A JP 2006146084 A JP2006146084 A JP 2006146084A JP 2004339482 A JP2004339482 A JP 2004339482A JP 2004339482 A JP2004339482 A JP 2004339482A JP 2006146084 A JP2006146084 A JP 2006146084A
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optical fiber
ferrule
cylindrical body
elastic cylindrical
fiber
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Yuuri Kinoshita
有里 木下
Kazuhiro Kinoshita
和浩 木下
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To obtain a structure and a method of mounting a ferrule of an optical fiber, with which the cost is reduced and at the same time, loss of fiber is reduced. <P>SOLUTION: An elastic cylindrical body 20, which is made of rubber or nylon or plastic or the like, for example, is inserted between a high-tensile fiber 13 and a coated optical fiber 14. Then, a metal ferrule 30 is caulked by a pair of pressing pliers, which has a regular polygon or a true circular shape, at the position corresponding to the elastic cylindrical body 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、例えばコネクタを取付ける際に用いられるフェルールを光ファイバコードの端部に取付けるための光ファイバのフェルール取付構造および取付方法に関するものである。   The present invention relates to a ferrule mounting structure and mounting method for an optical fiber for mounting a ferrule used when, for example, a connector is attached to an end of an optical fiber cord.

従来より、フェルールと光ファイバコードとを固定する光ファイバのフェルール取付構造としては、接着剤により固定するもの（例えば特許文献１参照）や、圧着により固定するもの（例えば特許文献２参照）が知られている。
特許文献１に開示された光ファイバのフェルール取付構造では、光ファイバコードの端部に硬化型接着剤を用いてフェルールを接合する前に、光ファイバコードの端末部に弾性接着剤を塗布しておき、その後フェルールを取付けるための硬化型接着剤を塗布することで先の弾性接着剤を硬化型接着剤のバリア層として作用させ、硬化型接着剤が抗張力繊維内を浸透するのを防止して外部にしみ出るのを防止している。なお、上記した弾性接着剤は、光ファイバコードの端部を所定形状に成形してフェルール内への挿通性を確保する役割も有している。 Conventionally, as an optical fiber ferrule mounting structure for fixing a ferrule and an optical fiber cord, there are known one fixed by an adhesive (for example, see Patent Document 1) and one fixed by pressure bonding (for example, see Patent Document 2). It has been.
In the optical fiber ferrule mounting structure disclosed in Patent Document 1, an elastic adhesive is applied to the end portion of the optical fiber cord before the ferrule is joined to the end portion of the optical fiber cord using a curable adhesive. Then, by applying a curable adhesive for attaching a ferrule, the previous elastic adhesive acts as a barrier layer for the curable adhesive to prevent the curable adhesive from penetrating into the tensile fiber. Prevents oozing out. The elastic adhesive described above also has a role of ensuring the insertion property into the ferrule by forming the end portion of the optical fiber cord into a predetermined shape.

しかしながら、この特許文献１に記載された光ファイバのフェルール取付構造では、異なる特性の２種類の接着剤を使用しているために、管理コストが嵩むという不都合がある。また、先に塗布した弾性接着剤が硬化しないと、次工程でのフェルールと光ファイバコードとの接続を行う硬化型接着剤が適用できない。そのため、接続作業時間が長引き作業効率が低下するという不都合も生じる。さらに、フェルールと光ファイバコードとは接着剤のみでの固着であったため、保持力不足を生じる虞がある。   However, in the optical fiber ferrule mounting structure described in Patent Document 1, since two types of adhesives having different characteristics are used, there is an inconvenience that the management cost increases. In addition, unless the previously applied elastic adhesive is cured, a curable adhesive for connecting the ferrule and the optical fiber cord in the next process cannot be applied. For this reason, there is a disadvantage that the connection work time is prolonged and the work efficiency is lowered. Further, since the ferrule and the optical fiber cord are fixed only by the adhesive, there is a possibility that the holding force is insufficient.

一方、特許文献２に開示された光ファイバのフェルール取付構造では、図３に示すように、接着剤を用いずにフェルールと光ファイバコードとを固定している。
すなわち、図３に示すように、このフェルール取付構造１００では、中心部に光ファイバ素線１０１が挿通する中空部を有し、外周部に複数に分割されて周方向に配置された拡張−挟持部１０２と、各拡張−挟持部１０２を連結する連結部１０３を設けた管状のチャック１０４と、チャック１０４の拡張−挟持部１０２に嵌合することにより、径方向外側に弾性的に拡張する弾性管状体１０５を備えている。
そして、チャック１０４の中空部に光ファイバ素線１０１を通し、チャック１０４の拡張−挟持部１０２に弾性管状体１０５を嵌合して弾性管状体１０５を径方向外側に拡張することによりその復元力で拡張−挟持部１０２を径方向内側に押圧して光ファイバ素線１０１を弾性的に挟持している。
特開２００２−４０２８９号公報 特開平１０−３１１２９号公報 On the other hand, in the ferrule mounting structure for an optical fiber disclosed in Patent Document 2, as shown in FIG. 3, the ferrule and the optical fiber cord are fixed without using an adhesive.
That is, as shown in FIG. 3, this ferrule mounting structure 100 has a hollow portion through which the optical fiber 101 is inserted in the center portion, and is divided into a plurality of outer peripheral portions and arranged in the circumferential direction. Part 102, a tubular chuck 104 provided with a connecting part 103 for connecting each expansion-clamping part 102, and an elasticity that elastically expands radially outward by being fitted to the expansion-clamping part 102 of the chuck 104 A tubular body 105 is provided.
Then, the optical fiber 101 is passed through the hollow portion of the chuck 104, the elastic tubular body 105 is fitted to the expansion-clamping portion 102 of the chuck 104, and the elastic tubular body 105 is expanded radially outward to restore its restoring force. The optical fiber 101 is elastically clamped by pressing the expansion-clamping portion 102 radially inward.
Japanese Patent Laid-Open No. 2002-40289 Japanese Patent Laid-Open No. 10-31129

しかしながら、前述した特許文献２に記載の取付構造においては、フェルールの構造が複雑になり、コストアップを招くという不都合がある。また、光ファイバを直接チャック１０４で圧着するため、接着剤を用いて接着する場合に比してファイバロスが大きくなるという不都合があった。   However, the mounting structure described in Patent Document 2 described above has a disadvantage that the structure of the ferrule is complicated and the cost is increased. In addition, since the optical fiber is directly pressure-bonded by the chuck 104, there is a disadvantage that the fiber loss becomes larger than when the adhesive is used for bonding.

本発明は、前述した問題点に鑑みてなされたものであり、その目的は、コストダウンを図るとともにファイバロスを低減することができる光ファイバのフェルール取付構造および取付方法を提供することにある。   The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an optical fiber ferrule mounting structure and mounting method capable of reducing cost and reducing fiber loss.

前述した目的を達成するために、本発明にかかる光ファイバのフェルール取付構造は、フェルール内の光ファイバコードの端末が、外被の内側の抗張力繊維、光ファイバ心線、光ファイバ素線の順に露出し、前記抗張力繊維と前記光ファイバ心線との間に弾性筒状体を有し、前記フェルールがかしめられ前記弾性筒状体が変形したことを特徴としている。   In order to achieve the above-mentioned object, the ferrule mounting structure for an optical fiber according to the present invention is such that the end of the optical fiber cord in the ferrule is in the order of the tensile strength fiber inside the jacket, the optical fiber core wire, and the optical fiber strand. It is exposed and has an elastic cylindrical body between the tensile strength fiber and the optical fiber core, and the ferrule is caulked to deform the elastic cylindrical body.

このように構成された光ファイバのフェルール取付構造においては、抗張力繊維と光ファイバ心線との間に、例えばゴム、ナイロン、プラスチック等から成る弾性筒状体を挿入し、この弾性筒状体に対応する位置でフェルールを、正多角形あるいは真円等の圧着ペンチでかしめる。すなわち、抗張力繊維および外被は弾性筒状体とかしめられたフェルールとの間で挟持され、光ファイバ心線は弾性筒状体の変形により挟持されるので、一括して挟持することができる。これにより、接着剤を用いることなく、弾性筒状体を挿入するだけで光ファイバコードをフェルールに取付けることができるので、コストダウンを図るとともに、取付作業時間の短縮を図ることができる。また、弾性筒状体を介して光ファイバ心線をかめしることになるので、ファイバロスを改善することができる。   In the optical fiber ferrule mounting structure configured as described above, an elastic cylindrical body made of, for example, rubber, nylon, plastic or the like is inserted between the tensile strength fiber and the optical fiber core wire, and the elastic cylindrical body is inserted into the elastic cylindrical body. The ferrule is caulked with crimping pliers such as a regular polygon or a perfect circle at the corresponding position. That is, the tensile strength fiber and the jacket are sandwiched between the elastic tubular body and the caulked ferrule, and the optical fiber core wire is sandwiched by deformation of the elastic tubular body, so that they can be sandwiched together. As a result, the optical fiber cord can be attached to the ferrule simply by inserting the elastic cylindrical body without using an adhesive, so that the cost can be reduced and the attaching operation time can be shortened. Further, since the optical fiber core wire is caulked via the elastic cylindrical body, the fiber loss can be improved.

また、本発明にかかる光ファイバのフェルール取付方法は、光ファイバコードを端末に向かって外被の内側の抗張力繊維、光ファイバ心線、光ファイバ素線の順に露出させる工程と、前記露出した抗張力繊維を前記外被の外側に折り返す工程と、前記抗張力繊維と前記光ファイバ心線との間に弾性筒状体を挿入する工程と、前記弾性筒状体が挿入された前記光ファイバコードをフェルールに挿入する工程と、前記挿入された弾性筒状体に対応する位置において前記フェルールをかしめる工程と、を有することを特徴としている。   The method for attaching an optical fiber ferrule according to the present invention includes a step of exposing an optical fiber cord toward a terminal in the order of a tensile fiber inside the jacket, an optical fiber core, and an optical fiber, and the exposed tensile strength. A step of folding a fiber to the outside of the jacket; a step of inserting an elastic tubular body between the tensile fiber and the optical fiber core; and a ferrule for the optical fiber cord into which the elastic tubular body is inserted. And a step of caulking the ferrule at a position corresponding to the inserted elastic cylindrical body.

このように構成された光ファイバのフェルール取付方法においては、光ファイバコードの端末で、外被の内側の抗張力繊維、光ファイバ心線、光ファイバ素線の順に露出させ、抗張力繊維を前記外被の外側に折り返して、抗張力繊維と光ファイバ心線との間に、例えばゴム、ナイロン、プラスチック等から成る弾性筒状体を挿入する。そして、弾性筒状体が挿入された光ファイバコードをフェルールに挿入し、弾性筒状体に対応する位置でフェルールを、正多角形あるいは真円等の圧着ペンチでかしめる。すなわち、抗張力繊維および外被は弾性筒状体とかしめられたフェルールとの間で挟持され、光ファイバ心線は弾性筒状体の変形により挟持されるので、一括して挟持することができる。これにより、接着剤を用いることなく、弾性筒状体を挿入するだけで光ファイバコードをフェルールに取付けることができるので、コストダウンを図るとともに、取付作業時間の短縮を図ることができる。また、弾性筒状体を介して光ファイバ心線をかしめることになるので、ファイバロスを改善することができる。   In the optical fiber ferrule mounting method configured as described above, at the end of the optical fiber cord, the tensile strength fiber, the optical fiber core wire, and the optical fiber strand inside the outer sheath are exposed in this order, and the tensile strength fiber is exposed to the outer sheath. An elastic cylindrical body made of, for example, rubber, nylon, plastic or the like is inserted between the tensile strength fiber and the optical fiber core. Then, the optical fiber cord into which the elastic cylindrical body is inserted is inserted into the ferrule, and the ferrule is crimped with a crimping pliers such as a regular polygon or a perfect circle at a position corresponding to the elastic cylindrical body. That is, the tensile strength fiber and the jacket are sandwiched between the elastic tubular body and the caulked ferrule, and the optical fiber core wire is sandwiched by deformation of the elastic tubular body, so that they can be sandwiched together. As a result, the optical fiber cord can be attached to the ferrule simply by inserting the elastic cylindrical body without using an adhesive, so that the cost can be reduced and the attaching operation time can be shortened. Further, since the optical fiber core is caulked through the elastic cylindrical body, the fiber loss can be improved.

本発明によれば、従来のような接着剤を用いることによるコストアップや作業時間の長時間化、あるいは、直接かしめて光ファイバ心線に過大なかしめ力を作用させることによるファイバロスの悪化という問題を解消でき、これによりコストダウンを図るとともに取付作業時間の短縮を図ることができ、さらに、ファイバロスを改善することができるという効果が得られる。   According to the present invention, the cost increase and the working time are increased by using the conventional adhesive, or the fiber loss is deteriorated by directly caulking and applying an excessive caulking force to the optical fiber core wire. The problem can be solved, thereby reducing the cost, shortening the installation work time, and further improving the fiber loss.

以下、本発明に係る好適な実施の形態を図面に基づいて詳細に説明する。
図１は本発明の光ファイバのフェルール取付構造に係る一実施の形態を示す断面図であり、（Ａ）は金属製フェルールのかしめ前の断面図、（Ｂ）は金属製フェルールのかしめ後の断面図である。
なお、フェルールは金属製である場合を例に説明するが、本発明はこれに限定するものではなく、かしめの効く材質であれば何でも良く、合成樹脂製でも構わない。 DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing an embodiment of an optical fiber ferrule mounting structure of the present invention, (A) is a cross-sectional view before caulking of a metal ferrule, and (B) is after caulking of a metal ferrule. It is sectional drawing.
The case where the ferrule is made of metal will be described as an example. However, the present invention is not limited to this, and any material that can be caulked may be used, and it may be made of synthetic resin.

図１（Ａ）および（Ｂ）に示すように、本発明の一実施の形態である光ファイバのフェルール取付構造１０は、光ファイバコード１１を端末に向かって外被１２の内側の抗張力繊維１３、光ファイバ心線１４、光ファイバ素線１５の順に露出させるとともに、抗張力繊維１３と光ファイバ心線１４との間に弾性筒状体２０を挿入して端末処理してある。そして、端末処理した光ファイバコード１１を金属製フェルール３０に挿入して挿入された弾性筒状体２０に対応する位置において金属製フェルール３０をかしめることにより、光ファイバコード１１および光ファイバ心線１４を金属製フェルール３０に一括して取付けてある。   As shown in FIGS. 1A and 1B, an optical fiber ferrule mounting structure 10 according to an embodiment of the present invention has an optical fiber cord 11 facing a terminal and a tensile strength fiber 13 inside a jacket 12. In addition, the optical fiber core wire 14 and the optical fiber strand 15 are exposed in this order, and an elastic cylindrical body 20 is inserted between the tensile strength fiber 13 and the optical fiber core wire 14 to perform terminal processing. Then, the optical fiber cord 11 and the optical fiber core wire are inserted into the metal ferrule 30 by caulking the metal ferrule 30 at a position corresponding to the inserted elastic cylindrical body 20. 14 are collectively attached to the metal ferrule 30.

すなわち、抗張力繊維１３と光ファイバ心線１４との間に、例えばゴム、ナイロン、プラスチック等から成る弾性筒状体２０を挿入し、この弾性筒状体２０が挿入された光ファイバコード１１をフェルール３０に挿入して、光ファイバ素線１５をフェルール３０先端の穴３０ａに挿通して位置決めし、先端を外に出す。このとき、光ファイバ心線１４部分をフェルール３０の先端部の穴３０ｂ近くまで伸ばしておくと、光ファイバ素線１５がぶれないように抑えることができる。従って、光ファイバ心線１４部分は、フェルール３０の内部空間３０ｃに収容され、弾性筒状体２０が挿入された部分の光ファイバコード１１は、フェルール３０の基端側(図１において右側)の内部空間３０ｄに収容されることになる。
なお、このとき、弾性筒状体２０の端部がフェルール３０の端部から少し突出るようにするのが望ましい。 That is, an elastic cylindrical body 20 made of, for example, rubber, nylon, plastic or the like is inserted between the tensile strength fiber 13 and the optical fiber core wire 14, and the optical fiber cord 11 into which the elastic cylindrical body 20 is inserted is a ferrule. The optical fiber 15 is inserted into the hole 30a at the tip of the ferrule 30 and positioned, and the tip is taken out. At this time, if the portion of the optical fiber 14 is extended to the vicinity of the hole 30b at the tip of the ferrule 30, the optical fiber 15 can be suppressed from being shaken. Accordingly, the optical fiber 14 is accommodated in the inner space 30c of the ferrule 30, and the optical fiber cord 11 of the portion into which the elastic cylindrical body 20 is inserted is on the proximal end side (right side in FIG. 1) of the ferrule 30. It will be accommodated in the internal space 30d.
At this time, it is desirable that the end of the elastic cylindrical body 20 slightly protrudes from the end of the ferrule 30.

フェルール３０の基端側端部では、弾性筒状体２０に対応する位置(かしめ部３１)でフェルール３０をかしめる。このため、金属製フェルール３０としては、容易にかしめ変形可能なものを使用するのが望ましい。また、かしめ具３２としては、かしめ部３１を正多角形、もしくは真円にかしめできる圧着ペンチ等を用いるのが望ましい。   At the base end side end of the ferrule 30, the ferrule 30 is caulked at a position (caulking portion 31) corresponding to the elastic cylindrical body 20. For this reason, it is desirable to use a metal ferrule 30 that can be easily caulked and deformed. As the caulking tool 32, it is desirable to use crimping pliers or the like that can caulk the caulking portion 31 into a regular polygon or a perfect circle.

以上、前述した光ファイバのフェルール取付構造１０によれば、抗張力繊維１３および外被１２を弾性筒状体２０とかしめられた金属製フェルール３０との間で挟持し、光ファイバ心線１４を弾性筒状体２０の変形により挟持することになるので、光ファイバコード１１および光ファイバ心線１４を一括して挟持することができる。
また、従来のように接着剤を用いることなく、弾性筒状体２０を挿入するだけで、光ファイバコード１１を金属製フェルール３０に取付けることができるので、コストダウンを図るとともに、取付作業時間の短縮を図ることができる。さらに、弾性筒状体２０を介して光ファイバ心線１４をかしめることになるので、ファイバロスを改善することができる。 As described above, according to the optical fiber ferrule mounting structure 10 described above, the tensile fiber 13 and the jacket 12 are sandwiched between the elastic tubular body 20 and the metal ferrule 30 that is crimped, and the optical fiber core wire 14 is elastic. Since the cylindrical body 20 is clamped by deformation, the optical fiber cord 11 and the optical fiber core wire 14 can be clamped together.
Moreover, since the optical fiber cord 11 can be attached to the metal ferrule 30 only by inserting the elastic cylindrical body 20 without using an adhesive as in the prior art, the cost can be reduced and the installation work time can be reduced. Shortening can be achieved. Furthermore, since the optical fiber core wire 14 is caulked through the elastic cylindrical body 20, the fiber loss can be improved.

なお、かしめの際に、過剰なかしめ力により弾性筒状体２０が変形し過ぎて伝送損失を増加させたり、光ファイバ心線１４を傷つけたりすることがないように、弾性筒状体２０の剛性およびかしめ力に注意を払うようにするのが望ましい。   In the caulking, the elastic cylindrical body 20 is not deformed by an excessive caulking force so as to increase the transmission loss or damage the optical fiber core wire 14. It is desirable to pay attention to stiffness and caulking force.

次に、本発明の一実施の形態である光ファイバのフェルール取付方法について説明する。図２（Ａ）〜（Ｆ）には、加工工程が示されている。
まず、図２（Ａ）に示す光ファイバコード１１を、図２（Ｂ）に示すように、端末に向かって外被１２の内側の抗張力繊維１３、光ファイバ心線１４、光ファイバ素線１５の順に露出させ、露出した抗張力繊維１３を外被１２の外側に折り返し、さらに図２（Ｃ）に示すように、抗張力繊維１３と光ファイバ心線１４との間に弾性筒状体２０を挿入して端末処理を行う。 Next, an optical fiber ferrule mounting method according to an embodiment of the present invention will be described. 2A to 2F show the processing steps.
First, as shown in FIG. 2 (B), the optical fiber cord 11 shown in FIG. 2 (A) is stretched toward the terminal with the tensile strength fibers 13, the optical fiber core wires 14, and the optical fiber strands 15 inside the jacket 12. The exposed tensile strength fiber 13 is folded back to the outer side of the outer cover 12, and an elastic cylindrical body 20 is inserted between the tensile strength fiber 13 and the optical fiber core wire 14 as shown in FIG. Terminal processing.

すなわち、光ファイバコード１１の端部から外被１２を所定の長さ切除して抗張力繊維１３を露出させ、さらに所定の長さだけ抗張力繊維１３を除去して露出した光ファイバ心線１４を端部から所定の長さ切除して光ファイバ素線１５を露出させる。外被１２より露出した抗張力繊維１３は外被１２の外側に折り返す。そして、抗張力繊維１３と光ファイバ心線１４との間に弾性筒状体２０を押し込む。   That is, the outer sheath 12 is cut from the end of the optical fiber cord 11 by a predetermined length to expose the tensile fiber 13, and the tensile fiber 13 is further removed by a predetermined length to expose the exposed optical fiber core wire 14. The optical fiber strand 15 is exposed by excising a predetermined length from the portion. The tensile strength fibers 13 exposed from the jacket 12 are folded back to the outside of the jacket 12. Then, the elastic cylindrical body 20 is pushed between the tensile strength fiber 13 and the optical fiber core wire 14.

次いで、図２（Ｄ）に示すように、弾性筒状体２０を挿入した光ファイバコード１１の端部を、金属製フェルール３０に挿入し、光ファイバ素線１５をフェルール３０先端の穴３０ａに挿通して位置決めし、先端を穴３０ａから外に出す。これにより、光ファイバ心線１４は、フェルール３０の内部空間３０ｂおよび内部空間３０ｃに収容され、弾性筒状体２０が挿入されている部分の光ファイバコード１１が内部空間３０ｄに収容されることになる。   Next, as shown in FIG. 2D, the end portion of the optical fiber cord 11 into which the elastic cylindrical body 20 has been inserted is inserted into the metal ferrule 30, and the optical fiber strand 15 is inserted into the hole 30a at the tip of the ferrule 30. It is inserted and positioned, and the tip is taken out from the hole 30a. Thereby, the optical fiber core wire 14 is accommodated in the internal space 30b and the internal space 30c of the ferrule 30, and the portion of the optical fiber cord 11 into which the elastic cylindrical body 20 is inserted is accommodated in the internal space 30d. Become.

その後、図２（Ｅ）に示すように、かしめ具３２を用いて金属製フェルール３０のかしめ部３１を外方よりかしめて、図２（Ｆ）に示すように、外被１２、抗張力繊維１３および弾性筒状体２０を変形させる。このとき、過剰なかしめ力により弾性筒状体２０が変形し過ぎて光ファイバ心線１４を圧迫して伝送損失を増加させたり、光ファイバ心線１４を傷つけたりすることがないように、弾性筒状体２０の剛性およびかしめ力に注意を払うようにする。これにより、光ファイバコード１１の先端に金属製フェルール３０を固定する。   Thereafter, as shown in FIG. 2 (E), the caulking portion 31 of the metal ferrule 30 is caulked from the outside using a caulking tool 32, and as shown in FIG. And the elastic cylindrical body 20 is deformed. At this time, the elastic tubular body 20 is not elastically deformed by excessive caulking force and does not press the optical fiber core 14 to increase transmission loss or damage the optical fiber core 14. Attention should be paid to the rigidity and caulking force of the cylindrical body 20. Thereby, the metal ferrule 30 is fixed to the tip of the optical fiber cord 11.

以上、前述した光ファイバのフェルール取付方法によれば、抗張力繊維１３および外被１２を弾性筒状体２０とかしめられた金属製フェルール３０との間で挟持し、光ファイバ心線１４を弾性筒状体２０の変形により挟持することになるので、光ファイバコード１１および光ファイバ心線１４を一括して挟持することができる。また、従来のように接着剤を用いることなく、弾性筒状体２０を挿入するだけで、光ファイバコード１１を金属製フェルール３０に取付けることができるので、コストダウンを図るとともに、取付作業時間の短縮を図ることができる。さらに、弾性筒状体２０を介して光ファイバ心線１４をかしめることになるので、ファイバロスを改善することができる。   As described above, according to the optical fiber ferrule mounting method described above, the tensile strength fiber 13 and the jacket 12 are sandwiched between the elastic tubular body 20 and the metal ferrule 30 that is caulked, and the optical fiber core wire 14 is attached to the elastic tubular body. Since it will be clamped by deformation of the body 20, the optical fiber cord 11 and the optical fiber core wire 14 can be clamped together. Moreover, since the optical fiber cord 11 can be attached to the metal ferrule 30 only by inserting the elastic cylindrical body 20 without using an adhesive as in the prior art, the cost can be reduced and the installation work time can be reduced. Shortening can be achieved. Furthermore, since the optical fiber core wire 14 is caulked through the elastic cylindrical body 20, the fiber loss can be improved.

なお、本発明の光ファイバのフェルール取付構造および取付方法は、上記した実施の形態に限定されるものでなく、適宜な変形、改良等が可能である。
例えば、上記した実施の形態においては、光ファイバコード１１の端部に光ファイバ素線１５、光ファイバ心線１４、抗張力繊維１３を露出させて抗張力繊維１３を外被１２の外側に折り返した後に弾性筒状体２０を抗張力繊維１３と光ファイバ心線１４との間に挿入したが、最初から光ファイバコード１１における抗張力繊維１３と光ファイバ心線１４との間に弾性筒状体２０を内蔵したものを使用することも可能である。 In addition, the ferrule attachment structure and attachment method of the optical fiber of this invention are not limited to above-described embodiment, A suitable deformation | transformation, improvement, etc. are possible.
For example, in the above-described embodiment, after the optical fiber 15, the optical fiber 14, and the tensile fiber 13 are exposed at the end of the optical fiber cord 11 and the tensile fiber 13 is folded back to the outside of the jacket 12. Although the elastic cylindrical body 20 is inserted between the tensile strength fiber 13 and the optical fiber core wire 14, the elastic cylindrical body 20 is built in between the tensile strength fiber 13 and the optical fiber core wire 14 in the optical fiber cord 11 from the beginning. It is also possible to use what has been done.

本発明に係る光ファイバのフェルール取付構造および取付方法は、フェルールを使用する全ての光ファイバコードに適用することができる。   The optical fiber ferrule mounting structure and mounting method according to the present invention can be applied to all optical fiber cords using ferrules.

（Ａ）本発明に係る光ファイバのフェルール取付構造の一実施の形態を示すかしめ前の断面図である。 （Ｂ）本発明に係る光ファイバのフェルール取付構造の一実施の形態を示すかしめ後の断面図である。(A) It is sectional drawing before crimping which shows one Embodiment of the ferrule attachment structure of the optical fiber which concerns on this invention. (B) It is sectional drawing after caulking which shows one Embodiment of the ferrule attachment structure of the optical fiber which concerns on this invention. （Ａ）〜（Ｆ）は、本発明に係る光ファイバのフェルール取付方法における各工程を示す断面図である。(A)-(F) are sectional drawings which show each process in the ferrule attachment method of the optical fiber which concerns on this invention. (Ａ)は従来の光ファイバのフェルール取付構造を示す断面図である。 (Ｂ)は(Ａ)におけるＢ−Ｂ位置の断面図である。(A) is sectional drawing which shows the ferrule attachment structure of the conventional optical fiber. (B) is sectional drawing of the BB position in (A).

符号の説明Explanation of symbols

１０ フェルール取付構造
１１ 光ファイバコード
１２ 外被
１３ 抗張力繊維
１４ 光ファイバ心線
１５ 光ファイバ素線
２０ 弾性筒状体
３０ 金属製フェルール DESCRIPTION OF SYMBOLS 10 Ferrule mounting structure 11 Optical fiber cord 12 Outer sheath 13 Tensile fiber 14 Optical fiber core wire 15 Optical fiber strand 20 Elastic cylindrical body 30 Metal ferrule

Claims (2)

フェルール内の光ファイバコードの端末が、外被の内側の抗張力繊維、光ファイバ心線、光ファイバ素線の順に露出し、前記抗張力繊維と前記光ファイバ心線との間に弾性筒状体を有し、
前記フェルールがかしめられ前記弾性筒状体が変形したことを特徴とする光ファイバのフェルール取付構造。 The end of the optical fiber cord in the ferrule is exposed in the order of the tensile fiber inside the jacket, the optical fiber core, and the optical fiber, and an elastic cylindrical body is interposed between the tensile fiber and the optical fiber core. Have
A ferrule mounting structure for an optical fiber, wherein the ferrule is caulked and the elastic cylindrical body is deformed. 光ファイバコードを端末に向かって外被の内側の抗張力繊維、光ファイバ心線、光ファイバ素線の順に露出させる工程と、前記露出した抗張力繊維を前記外被の外側に折り返す工程と、前記抗張力繊維と前記光ファイバ心線との間に弾性筒状体を挿入する工程と、前記弾性筒状体が挿入された前記光ファイバコードをフェルールに挿入する工程と、前記挿入された弾性筒状体に対応する位置において前記フェルールをかしめる工程と、を有することを特徴とする光ファイバのフェルール取付方法。   Exposing the optical fiber cord toward the terminal in the order of the tensile strength fiber inside the jacket, the optical fiber core, and the optical fiber, the step of folding the exposed tensile fiber outside the jacket, and the tensile strength A step of inserting an elastic cylindrical body between a fiber and the optical fiber core, a step of inserting the optical fiber cord in which the elastic cylindrical body is inserted into a ferrule, and the inserted elastic cylindrical body And a step of caulking the ferrule at a position corresponding to the optical fiber ferrule mounting method.
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