JP2009244288A - Optical fiber cable with connector - Google Patents

Optical fiber cable with connector Download PDF

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JP2009244288A
JP2009244288A JP2008087086A JP2008087086A JP2009244288A JP 2009244288 A JP2009244288 A JP 2009244288A JP 2008087086 A JP2008087086 A JP 2008087086A JP 2008087086 A JP2008087086 A JP 2008087086A JP 2009244288 A JP2009244288 A JP 2009244288A
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optical fiber
optical
core wire
connector
visible light
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JP5050209B2 (en
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Yoshiaki Terasawa
良明 寺沢
Hideaki Tajima
英明 田島
Takayuki Serigano
貴之 芹ヶ野
Yoshihisa Okabe
圭寿 岡部
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Toyokuni Electric Cable Co Ltd
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Toyokuni Electric Cable Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical fiber cable with a connector for identifying a core fibers in a hot line state without influencing optical transmission signals and easily identifying the core fibers by visual observation without removing the optical connector even when a number of the optical fiber cables or the like on an optical wiring board are overcrowding. <P>SOLUTION: The optical core fiber 7 for identifying the optical core fibers by visible light in addition to the optical core fibers for communication are stored concerning the optical fiber cable mounting the optical connector 10 for communication on both ends. The optical core fiber 7 for identifying the optical core fibers are 1/50-3/10 of rigidity of the optical core fibers for communication and 1/5-2/3 of outside diameters. Members 11 for identifying the optical core fibers making visible light incident are mounted in the vicinity of one optical connector 10, and the members for identifying the optical core fibers emitting visible light are mounted in the vicinity of the other optical connector. The members for identifying the optical core fibers making visible light incident and the members for identifying the optical core fibers emitting visible light are the same material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、両端に光コネクタが装着された心線対照機能を備えたコネクタ付光ファイバケーブルに関する。   TECHNICAL FIELD The present invention relates to an optical fiber cable with a connector having a function of contrasting optical fibers with optical connectors attached to both ends.

近年、通信事業者と各家庭を直接光ファイバで結び高速通信サービスを提供するＦＴＴＨ（Fiber To The Home）等の普及で、光通信の加入者が増加している。光通信における伝送システムでは、配線網の形成に光配線盤が用いられるが、加入者の増加に伴い多数の光ファイバコードの接続を高密度実装で形成している。このような光配線盤において、光ファイバコードの増設、配線変更、保守点検等に際しては、光ファイバコードの接続先を確認して行う必要がある。しかしながら、光配線盤の前面側および背面側で多数の光ファイバコードあるいは光ジャンパー線が互いに輻輳している状態において、対象とする光ファイバコードが装着されている光コネクタを識別して着脱操作を行うことは容易でない。   2. Description of the Related Art In recent years, optical communication subscribers are increasing due to the spread of FTTH (Fiber To The Home), which provides a high-speed communication service by directly connecting a communication carrier and each home with an optical fiber. In a transmission system in optical communication, an optical distribution board is used to form a wiring network. However, as the number of subscribers increases, many optical fiber cords are connected by high-density mounting. In such an optical distribution board, it is necessary to confirm the connection destination of the optical fiber cord when adding an optical fiber cord, changing the wiring, performing maintenance, or the like. However, in the state where many optical fiber cords or optical jumper wires are congested with each other on the front side and the rear side of the optical distribution board, the optical connector to which the target optical fiber cord is attached is identified and attached / detached. It is not easy to do.

このため、例えば、特許文献１には、光配線盤から光コネクタが外されている時は、光ファイバコードの一方から心線対照光を入射し、反対側の光コネクタが装着された部分で、光コネクタ部分に組込まれたＩＲフィルタのような対照光を可視光に変える光学素子に当てて光らせ、目視による心線対照ができるようにした技術が開示されている。また、光コネクタが光配線盤に接続されている状態の時には、光コネクタの近傍で光ファイバコードを屈曲させ、この屈曲点で対照光（可視レーザ光）を漏洩させる。この漏洩光を目視して確認することにより、心線対照することについても開示されている。   For this reason, for example, in Patent Document 1, when the optical connector is removed from the optical wiring board, the optical fiber cord is incident on the optical fiber cord, and the optical connector on the opposite side is attached. A technique has been disclosed in which a control light, such as an IR filter incorporated in an optical connector portion, is applied to an optical element that converts visible light into visible light so that the optical fiber can be visually checked. When the optical connector is connected to the optical wiring board, the optical fiber cord is bent in the vicinity of the optical connector, and the reference light (visible laser light) is leaked at this bending point. It is also disclosed that the cores are contrasted by visually confirming the leaked light.

また、特許文献２には、光通信ケーブル用の光コネクタを互いに接続する接続アダプタに切欠き部を設け、光通信ケーブルの一方の端部から照射した可視光を、前記の接続アダプタの切欠き部から外部に漏洩させて視認することにより、対象としている光通信ケーブルと認識することが開示されている。
特許第３３６３３８３号公報 特開２００７−２２６１１２号公報 Further, in Patent Document 2, a notch is provided in a connection adapter that connects optical connectors for an optical communication cable to each other, and visible light irradiated from one end of the optical communication cable is notched in the notch of the connection adapter. It is disclosed that it is recognized as a target optical communication cable by being leaked to the outside from a part and visually recognized.
Japanese Patent No. 3363383 JP 2007-226112 A

上記した特許文献１，２において、可視光を用いて光コネクタが光配線盤に接続された状態（活線状態）で光ファイバコード（光ファイバケーブル）の心線対照を行うことは開示されている。しかし、特許文献１のように、光コネクタを光配線盤に接続した状態で、コード屈曲部からの漏洩光を目視できる程度に光ファイバコードを屈曲すると、輻輳している配線状態においては、他の関係のない通信中の光ファイバコードも曲げられることがある。この場合、一時的であっても損失変動が生じ、これにより、伝送信号の誤り率を増大させることになる。また、可視光を用いて心線対照を行うとしても、光ファイバ内に入射された心線対照用の可視光は、信号系の波長と異なる波長であるが、フィルタ等で完全にカットしきれない場合、光伝送信号に悪影響を及ぼす恐れがある。   In the above-mentioned Patent Documents 1 and 2, it is disclosed that optical fiber cords (optical fiber cables) are subjected to optical fiber cord comparison in a state where an optical connector is connected to an optical wiring board (live line state) using visible light. Yes. However, as in Patent Document 1, when the optical fiber cord is bent to such an extent that leakage light from the cord bending portion can be visually observed in a state in which the optical connector is connected to the optical wiring board, in the congested wiring state, other The optical fiber cord during communication that is not related to the above may be bent. In this case, loss fluctuation occurs even temporarily, thereby increasing the error rate of the transmission signal. In addition, even if the optical fiber is contrasted using visible light, the optical fiber for visible light entering the optical fiber has a wavelength different from that of the signal system, but it can be completely cut by a filter or the like. Otherwise, the optical transmission signal may be adversely affected.

本発明は、上述した実情に鑑みてなされたもので、光伝送信号に影響を及ぼすことなく活線状態で心線対照ができ、また、光配線盤の多数の光ファイバケーブル等が輻輳した状態においても、光コネクタを外すことなく目視により容易に心線対照が行えるコネクタ付光ファイバケーブルの提供を目的とする。   The present invention has been made in view of the above-described circumstances, and can perform a core contrast in a live line state without affecting an optical transmission signal, and a state in which a large number of optical fiber cables and the like of an optical distribution board are congested The purpose of the present invention is also to provide an optical fiber cable with a connector that allows easy optical fiber line comparison without removing the optical connector.

本発明によるコネクタ付光ファイバケーブルは、両端に通信用の光コネクタが装着された光ファイバケーブルで、通信用光ファイバ心線の他に、可視光による心線対照用光ファイバ心線が収納されていることを特徴とする。前記の心線対照用光ファイバ心線は、通信用光ファイバ心線の剛性の３／１０以下１／５０以上、外経の２／３以下１／５以上であることが好ましい。
コネクタ付光ファイバケーブル一方の光コネクタの近傍に、心線対照用光ファイバに可視光を入射する心線対照部材が装着され、他方の光コネクタの近傍で、心線対照用光ファイバに可視光を出射する心線対照部材が装着される。なお、前記の可視光を入射する心線対照部材と、可視光を出射する心線対照部材とは、兼用可能な同じ部材とすることができる。 An optical fiber cable with a connector according to the present invention is an optical fiber cable in which optical connectors for communication are mounted at both ends. In addition to the optical fiber core for communication, the optical fiber core wire for contrasting with visible light is accommodated. It is characterized by. It is preferable that the above-mentioned optical fiber core wire for controlling the core wire is 3/10 or less 1/50 or more of the rigidity of the communication optical fiber core wire and 2/3 or less and 1/5 or more of the outer diameter.
A fiber optic cable with a connector is attached to one of the optical connectors near the optical fiber for the optical fiber for contrasting, and a visible light is applied to the optical fiber for optical fiber in the vicinity of the other optical connector. Is attached. In addition, the said core wire contrast member which injects said visible light, and the core wire contrast member which radiate | emits visible light can be made the same member which can be combined.

上記の本発明によれば、多数の光ファイバケーブルが光配線盤の前面あるいは背面で輻輳している場合でも、光コネクタを接続した状態で、光コネクタの手前で目視により容易に心線対照を行うことができる。また、ケーブル内には、心線対照用光ファイバ心線が、通信用光ファイバ心線とは別に配されているので、信号伝送中の活線状態においても、通信中の信号に影響を与えることなく安全に心線対照を行うことができる。   According to the present invention described above, even when a large number of optical fiber cables are congested on the front surface or the back surface of the optical distribution board, the optical fiber cable can be easily visually checked in front of the optical connector in the connected state. It can be carried out. In addition, since the optical fiber core wire for contrasting the core wire is arranged separately from the optical fiber core wire for communication in the cable, it affects the signal during communication even in the live line state during signal transmission. It is possible to safely perform the contrast control without any problems.

図により本発明の実施の形態を説明する。図１（Ａ）〜図１（Ｃ）は本発明に使用される光ファイバケーブルの構成例を示す図、図２はコネクタ付光ファイバケーブルの端部に心線対照部材を装着する一例を示す図である。図中、１，１' は多心光ケーブル、２，２'，２'' は光ファイバケーブル、３，３'はテンションメンバ、４は押え巻、５，５' はシース、６，６'，６'' は通信用光ファイバ心線、７は心線対照用光ファイバ心線、７ａは端部分、８は高張力繊維、９は外被、９ａは切り込み、１０は光コネクタ、１１は心線対照部材、１２ａ，１２ｂはフェルール保持部材、１３はキャップ部材、１４はフェルール、１５はフェルールホルダを示す。   Embodiments of the present invention will be described with reference to the drawings. 1 (A) to 1 (C) are diagrams showing a configuration example of an optical fiber cable used in the present invention, and FIG. 2 shows an example in which a core wire reference member is attached to an end of an optical fiber cable with a connector. FIG. In the figure, 1, 1 'is a multi-core optical cable, 2, 2', 2 "are optical fiber cables, 3, 3 'are tension members, 4 is a presser winding, 5, 5' is a sheath, 6, 6 ', 6 '' is an optical fiber for communication, 7 is an optical fiber for controlling the optical fiber, 7a is an end portion, 8 is a high tension fiber, 9 is a jacket, 9a is cut, 10 is an optical connector, 11 is a core Reference members 12a and 12b are ferrule holding members, 13 is a cap member, 14 is a ferrule, and 15 is a ferrule holder.

本発明に使用される光ケーブルは、例えば、図１（Ａ）に示すような多数の光ファイバケーブル（又は、光ファイバコード）２を収納した、多芯光ケーブル１を使用することができる。この多芯光ケーブル１は、例えば、内部に鋼線あるいは繊維強化プラスチック（ＦＲＰ：Fiber Reinforced Plastics）からなるテンションメンバ３を有し、その周囲に複数本の光ファイバケーブル２を配して、最外層はシース５で被覆される。複数本の光ファイバケーブル２は、必要に応じて同心状に複数層が配され、層毎に押え巻４で保持される。また、光ファイバケーブル２が少ない少芯光ケーブル１' においても同様に使用することができる。この少芯光ケーブル１' は、図１（Ａ）では、テンションメンバ３' の両側に光ファイバケーブル２を配して、シース５' で被覆した、２心の例で示してある。   As the optical cable used in the present invention, for example, a multi-core optical cable 1 containing a large number of optical fiber cables (or optical fiber cords) 2 as shown in FIG. 1A can be used. The multi-core optical cable 1 has, for example, a tension member 3 made of steel wire or fiber reinforced plastics (FRP) inside, and a plurality of optical fiber cables 2 arranged around the tension member 3, and the outermost layer. Is covered with a sheath 5. A plurality of optical fiber cables 2 are concentrically arranged as necessary, and are held by presser windings 4 for each layer. Further, it can be used in the same manner even in a small-core optical cable 1 ′ having a small number of optical fiber cables 2. In FIG. 1A, this small-core optical cable 1 ′ is shown as an example of two cores in which optical fiber cables 2 are arranged on both sides of a tension member 3 ′ and covered with a sheath 5 ′.

光ファイバケーブル２は、少なくとも１本の通信用光ファイバ心線６の外周に、アラミド繊維等の高張力繊維８と共に心線対照用光ファイバ心線７を配し、その外側を外被９で覆って構成される。通信用光ファイバ心線６には、例えば、標準外径１２５μｍのガラスファイバを、被覆外径が０.２５ｍｍ、０.５ｍｍ、０.９ｍｍで被覆した１心のものを用いることができる。   In the optical fiber cable 2, an optical fiber core wire 7 for controlling a core wire is disposed along with a high-strength fiber 8 such as an aramid fiber on the outer periphery of at least one optical fiber core fiber 6 for communication, and the outer side thereof is covered with a jacket 9 Constructed by covering. As the communication optical fiber 6, for example, a single fiber having a standard outer diameter of 125 μm coated with a coating outer diameter of 0.25 mm, 0.5 mm, and 0.9 mm can be used.

また、図１（Ｂ）に示すように、光ファイバテープ心線６'（４心程度のもの）を高張力繊維８で囲うとともに、心線対照用光ファイバ心線７を配して外被９で覆った光ファイバケーブル２' としてもよい。この他、図１（Ｃ）に示すように、複数本（例えば、２〜４本）の光ファイバ心線６'' を高張力繊維８で囲うとともに、心線対照用光ファイバ心線７を配して外被９で覆った構造の光ファイバケーブル２'' としてもよい。   Further, as shown in FIG. 1B, the optical fiber ribbon 6 '(about 4 fibers) is surrounded by the high-tensile fiber 8, and the optical fiber core 7 for controlling the optical fiber is arranged to provide a jacket. An optical fiber cable 2 ′ covered with 9 may be used. In addition, as shown in FIG. 1 (C), a plurality of (for example, 2 to 4) optical fiber cores 6 '' are surrounded by high-tensile fibers 8, and the optical fiber core wires 7 for controlling the core wires are Alternatively, an optical fiber cable 2 ″ having a structure covered with a jacket 9 may be used.

心線対照用光ファイバ心線７は、通信用光ファイバ心線６とは別に配するものであるが、通信用光ファイバ心線６と同じ標準外径１２５μｍのガラスファイバを用い、その被覆外径が概ね０.２５ｍｍ以下のものを用いるのが望ましい。なお、この心線対照用光ファイバ心線７は、可視光（４００ｎｍ〜７５０ｎｍ）を通すもので、通信用光ファイバ心線６ほどの低損失のものでなくてもよく、また、最も安価なシングルモード光ファイバ心線を用いることがもできる。   The optical fiber core wire 7 for contrasting the core wire is arranged separately from the optical fiber core wire 6 for communication, but uses the same glass fiber having a standard outer diameter of 125 μm as that of the optical fiber core wire 6 for communication. It is desirable to use one having a diameter of approximately 0.25 mm or less. The optical fiber core wire 7 for contrasting the optical fibers passes visible light (400 nm to 750 nm), and may not be as low as the optical fiber core wire 6 for communication, and is the cheapest. Single mode optical fiber cores can also be used.

高張力繊維８は、厚さが０.２５ｍｍ程度となるように配され、光ファイバケーブル２に対する抗張力体としての機能を持つと共に、通信用光ファイバ心線６に対する側圧を軽減する緩衝体としての機能を備える。特に、心線対照用光ファイバ心線７が隣接していると、ケーブルを曲げた際に通信用光ファイバ心線６に側圧がかかりやすくなる。このため、心線対照用光ファイバ心線７は、通信用光ファイバ心線６の剛性の３／１０以下１／５０以上とし、また、外径を２／３以下１／５以上として、通信用光ファイバ心線６よりは曲げやすくしておくのが望ましい。これにより、通信用光ファイバ心線６を曲げたときにも心線対照用光ファイバ心線７が存在することによる影響を軽減し、伝送損失が増加するのを抑制する。   The high-tensile fiber 8 is arranged to have a thickness of about 0.25 mm, functions as a tensile body for the optical fiber cable 2, and serves as a buffer body that reduces the lateral pressure on the communication optical fiber core 6. It has a function. Particularly, when the optical fiber core wires 7 for contrasting the core wires are adjacent to each other, a side pressure is easily applied to the communication optical fiber core wire 6 when the cable is bent. For this reason, the optical fiber core wire 7 for controlling the core wire is set to 3/10 or less 1/50 or more of the rigidity of the communication optical fiber core wire 6 and the outer diameter is set to 2/3 or less and 1/5 or more. It is desirable that the optical fiber core wire 6 be bent more easily. Thereby, even when the optical fiber 6 for communication is bent, the influence due to the presence of the optical fiber 7 for contrasting the core is reduced, and an increase in transmission loss is suppressed.

外被９は、ポリエチレン、難燃ポリエチレン、ポリ塩化ビニル等の樹脂材で形成することができ、被覆厚さが０.３ｍｍ程度で、押出し成形で形成される。
なお、通信用光ファイバ心線６に被覆外径が０.９ｍｍのもの１本を用い、心線対照用光ファイバ心線７に被覆外径が０.２５ｍｍのものを用い、高張力繊維８の厚さ０.２５ｍｍとし、外被９の厚さ０.３ｍｍで被覆すると、光ファイバケーブル２の外径は、２.０ｍｍ程度となる。 The jacket 9 can be formed of a resin material such as polyethylene, flame retardant polyethylene, and polyvinyl chloride, and has a coating thickness of about 0.3 mm and is formed by extrusion molding.
One optical fiber core wire for communication 6 having a coating outer diameter of 0.9 mm is used, and one optical fiber core wire 7 for core wire comparison having a coating outer diameter of 0.25 mm is used. The outer diameter of the optical fiber cable 2 is about 2.0 mm when the thickness is 0.25 mm and the outer cover 9 is covered with a thickness of 0.3 mm.

上述したような光ファイバケーブル２は、所定の長さで単心線の状態、あるいは、多心光ケーブル１として束ねられた状態で布設される。光ファイバケーブル２の両端には、図２で示すようにデータ通信用の光コネクタ１０が装着されて、コネクタ付光ファイバケーブルとされる。また、本発明においては、この光コネクタ１０の近傍部分に心線対照部材１１が取り付けられる。この心線対照部材１１は、例えば、心線対照用光ファイバ心線７の端部に装着されるフェルール１４と、心線対照用光ファイバの端部を光ファイバケーブル２に固定する部材、例えば、このフェルール１４を収納保持する２分割されたフェルール保持部材１２，１２ｂと、キャップ部材１３とで構成することができる。   The optical fiber cable 2 as described above is laid in a single-core wire state with a predetermined length or in a bundled state as the multi-fiber optical cable 1. As shown in FIG. 2, optical connectors 10 for data communication are attached to both ends of the optical fiber cable 2 to form an optical fiber cable with a connector. In the present invention, the core wire contrast member 11 is attached to the vicinity of the optical connector 10. The core wire contrast member 11 includes, for example, a ferrule 14 attached to an end portion of the core wire contrast optical fiber 7 and a member for fixing the end portion of the core wire contrast optical fiber to the optical fiber cable 2, for example, The ferrule holding members 12, 12 b that store and hold the ferrule 14 and the cap member 13 can be used.

光ファイバケーブル２の心線対照部材１１が取り付けられる部分では、外被９に切り込み９ａが入れられ、心線対照用光ファイバ心線７の端部分７ａがケーブルの外に引き出される。この外に引き出された心線対照用光ファイバ心線７の端部分７ａは、所定の長さで露出するように切断され、その端部にフェルール１４を装着し、フェルールホルダ１５により支持させる。   In the portion of the optical fiber cable 2 to which the core wire reference member 11 is attached, a cut 9a is made in the jacket 9, and the end portion 7a of the optical fiber core wire 7 for core wire reference is pulled out of the cable. The end portion 7 a of the optical fiber core wire 7 for contrasting the core wire drawn out is cut so as to be exposed at a predetermined length, and a ferrule 14 is attached to the end portion and supported by the ferrule holder 15.

フェルール１４、フェルールホルダ１５は、光コネクタ１０に用いられているフェルールと同じものを用いてもよく、特別に設計したものであってもよい。このフェルール１４は、心線対照用光ファイバ心線７内に可視光を入射させるために、可視光光源に接続するためのものであり、また、心線対照用光ファイバ心線７を通った可視光を外部に放光させる出射口とされるものである。   The ferrule 14 and the ferrule holder 15 may be the same as the ferrule used in the optical connector 10 or may be specially designed. This ferrule 14 is for connecting to a visible light source in order to allow visible light to enter the optical fiber 7 for controlling the optical core, and also passed through the optical fiber 7 for controlling the optical fiber. It is an exit that emits visible light to the outside.

図３は、上述した心線対照部材１１の詳細を説明する図で、図３（Ａ）はフェルール保持部材１２ａ，１２ｂとフェルール１４を示す図、図３（Ｂ）はキャップ部材１３を示す図である。図中、１７ａ、１７ｂはケーブル挿通溝、１８ａ，１８ｂはフェルール保持溝、１９ａは凹部、２０ａ，２０ｂはフェルール保持部材の前端面、２１はファイバ貫通孔、２２はフェルール収納孔、２３はキャップ部材の前端面を示し、その他の符号は図１，２で用いたのと同じ符号を用いることにより説明を省略する。   FIG. 3 is a diagram for explaining the details of the above-described core wire contrast member 11, FIG. 3 (A) is a diagram showing ferrule holding members 12 a and 12 b and a ferrule 14, and FIG. 3 (B) is a diagram showing a cap member 13. It is. In the figure, 17a and 17b are cable insertion grooves, 18a and 18b are ferrule holding grooves, 19a is a recess, 20a and 20b are front end surfaces of the ferrule holding member, 21 is a fiber through hole, 22 is a ferrule housing hole, and 23 is a cap member. The other reference numerals are the same as those used in FIGS.

フェルール保持部材１２ａ，１２ｂは、図２で説明した心線対照光ファイバ心線７の引き出された端部分７ａに装着されたフェルール１４、フェルールホルダ１５を収納保持するもので、互いに対称な２分割された形状で、例えば、プラスチック材により形成される。２分割された形状のフェルール保持部材１２ａ，１２ｂのそれぞれは、その接合面側に光ファイバケーブル２を挿通させるケーブル挿通溝１７ａ，１７ｂと、フェルール１４およびフェルールホルダ１５を保持固定するフェルール保持溝１８ａ，１８ｂと、露出された光ファイバ心線の端部分７ａを収納する凹部１９ａを有している。   The ferrule holding members 12a and 12b accommodate and hold the ferrule 14 and the ferrule holder 15 attached to the drawn end portion 7a of the core-cored optical fiber core wire 7 described in FIG. For example, a plastic material is used. Each of the ferrule holding members 12a and 12b having a shape divided into two includes cable insertion grooves 17a and 17b through which the optical fiber cable 2 is inserted on the joint surface side, and a ferrule holding groove 18a for holding and fixing the ferrule 14 and the ferrule holder 15. , 18b and a recessed portion 19a for accommodating the exposed end portion 7a of the optical fiber.

フェルール保持部材１２ａ，１２ｂは、光ファイバケーブル２およびフェルール１４を挟むようにして、互いに接合接着することにより、光ファイバケーブル２上の所定の部分（光コネクタ１０の近傍部分）に取り付け固定される。フェルール１４は、フェルール保持溝１８ａ，１８ｂの段部により軸方向に移動しないように位置決めされて保持固定され、フェルール１４の前半部は、保持部材の前端面２０ａ，２０ｂから突き出て、後述する可視光光源に光接続できるようにされている。また、ケーブル外に露出されている光ファイバ心線の端部分７ａは、凹部１９ａ内に収納されて、外力により切断されることから保護される。   The ferrule holding members 12a and 12b are attached and fixed to a predetermined portion (the vicinity of the optical connector 10) on the optical fiber cable 2 by being bonded to each other so as to sandwich the optical fiber cable 2 and the ferrule 14. The ferrule 14 is positioned and held and fixed so as not to move in the axial direction by the step portions of the ferrule holding grooves 18a and 18b, and the front half of the ferrule 14 protrudes from the front end surfaces 20a and 20b of the holding member, and will be described later. It is designed to be optically connected to a light source. The end portion 7a of the optical fiber core wire exposed outside the cable is housed in the recess 19a and is protected from being cut by an external force.

キャップ部材１３は、フェルール保持部材１２ａ，１２ｂの前端面２０ａ，２０ｂに接するように組み付けられて、フェルール保持部材の前端面２０ａ，２０ｂから突き出るフェルール１４を埃や汚れ等から保護する。このキャップ部材１３は、透明または光散乱性のある半透明の透光性樹脂材等で形成されていることが好ましく、例えば、ポリカーボネイト、ナイロン樹脂を使用することができる。これにより、後述するようにキャップ部材１３を通して、心線対照の可視光を容易に視認することができる。   The cap member 13 is assembled so as to be in contact with the front end surfaces 20a and 20b of the ferrule holding members 12a and 12b, and protects the ferrule 14 protruding from the front end surfaces 20a and 20b of the ferrule holding member from dust and dirt. The cap member 13 is preferably formed of a transparent or light-transparent translucent translucent resin material or the like. For example, polycarbonate or nylon resin can be used. Thereby, as will be described later, it is possible to easily visually recognize the contrasted visible light through the cap member 13.

キャップ部材１３は、光ファイバケーブル２が貫通するファイバ貫通孔２１と、フェルール保持部材の前端面２０ａ，２０ｂから突き出るフェルール１４が挿入されるフェルール収納孔２２を有し、光ファイバケーブル上に固定して設けられるフェルール保持部材１２ａ，１２ｂに対して、スライド可能に装着される。このキャップ部材１３は、その前端面２３が光コネクタの装着される端部方向と反対方向を向くように、光コネクタ１０が装着される前に、予め光ファイバケーブル２上に挿通させておく。   The cap member 13 has a fiber through hole 21 through which the optical fiber cable 2 passes, and a ferrule housing hole 22 into which the ferrule 14 protruding from the front end faces 20a and 20b of the ferrule holding member is inserted, and is fixed on the optical fiber cable. The ferrule holding members 12a and 12b provided are slidably mounted. The cap member 13 is inserted in advance onto the optical fiber cable 2 before the optical connector 10 is mounted so that the front end face 23 faces in the direction opposite to the end direction in which the optical connector is mounted.

図４は、本発明によるコネクタ付光ファイバケーブルとその使用形態を説明する図である。図４（Ａ）に示すように、本発明によるコネクタ付光ファイバコネクタは、所定長さの光ファイバケーブル２の両端に、光コネクタ１０ａ，１０ｂが装着され、この光コネクタに近接して心線対照部材１１ａ，１１ｂを取り付けて構成される。なお、光コネクタ１０ａを加入者等の端末側、光コネクタ１０ｂを光配線盤側とし、心線対照部材１１ａを可視光光源の接続側、心線対照部材１１ｂを心線対照が行われる光配線盤側と仮定する。   FIG. 4 is a view for explaining an optical fiber cable with a connector according to the present invention and a usage pattern thereof. As shown in FIG. 4A, in the optical fiber connector with a connector according to the present invention, optical connectors 10a and 10b are attached to both ends of an optical fiber cable 2 of a predetermined length, and the optical fiber cable is close to the optical connector. The control members 11a and 11b are attached. The optical connector 10a is the terminal side of the subscriber, the optical connector 10b is the optical wiring board side, the core wire contrast member 11a is the connection side of the visible light source, and the core wire contrast member 11b is the optical wiring in which the core wire contrast is performed. Assume the board side.

図４（Ｂ）に示すように、可視光光源を接続する心線対照部材１１ａ側は、フェルール保持部材１２ａ，１２ｂからキャップ部材１３を引き離し、フェルール１４をフェルール保持部材の前端面から露出させる。そして、このフェルール１４に光接続部材２５を介して可視光光源２４を接続する。可視光光源２４は、例えば、可視光（４００ｎｍ〜７５０ｎｍ）を送出する光源を用いることができる。なお、赤色の光は、光コネクタ等に対して比較的識別しやすく、光強度も強いことから、赤色レーザ光源による６００ｎｍ以上の赤色レーザ光を用いるのが望ましい。なお、光源は、レーザ光以外の光源であってもよい。   As shown in FIG. 4B, on the side of the core wire contrast member 11a to which the visible light source is connected, the cap member 13 is pulled away from the ferrule holding members 12a and 12b, and the ferrule 14 is exposed from the front end surface of the ferrule holding member. Then, the visible light source 24 is connected to the ferrule 14 via the optical connecting member 25. As the visible light source 24, for example, a light source that emits visible light (400 nm to 750 nm) can be used. It is desirable to use red laser light of 600 nm or more from a red laser light source because red light is relatively easy to identify with respect to an optical connector or the like and has high light intensity. The light source may be a light source other than laser light.

心線対照を行う側の心線対照部材１１ｂは、フェルール保持部材１２ａ，１２ｂからキャップ部材１３を引き離すことなく、フェルール１４の先端から放光される光を、透光性のキャップ部材１３を通して直接視認することで、心線対照を実施することができる。この場合，ケーブル両端の光コネクタ１０ａと１０ｂは、端末機器および光配線盤に接続したままで、通信用光ファイバ心線を通じて通信状態であってもよい。これは、心線対照用に用いる光ファイバ心線は、光コネクタが挿着された通信用光ファイバ心線とは独立に配しているので、心線対照用の可視光が通信用光ファイバ心線に入りこみ、通信中の信号に障害を生じさせることはないことによる。   The core contrast member 11b on the side performing the core contrast directly transmits the light emitted from the tip of the ferrule 14 through the translucent cap member 13 without pulling the cap member 13 away from the ferrule holding members 12a and 12b. By visual recognition, it is possible to carry out a cord contrast. In this case, the optical connectors 10a and 10b at both ends of the cable may be in a communication state through the communication optical fiber core wire while being connected to the terminal device and the optical wiring board. This is because the optical fiber core wire used for the core wire contrast is arranged independently of the communication optical fiber core wire to which the optical connector is inserted. This is because it does not enter the core wire and cause a failure in the signal during communication.

なお、可視光光源側の心線対照部材１１ａと心線対照側の心線対照部材１１ｂとは、互いに兼用可能な同じ形状のものを用いることができる。この場合、ケーブルの光源の入射側と心線対照側を、いずれの側にも設定することができ、ケーブル布設時にケーブルの布設方向を考慮する必要がない。しかし、心線対照を行う頻度は少ないので、心線対照側の心線対照部材１１ｂを簡略化したものとしてもよい。例えば、フェルール保持部材を省略した形態、あるいは、外に取り出し光ファイバ心線の端部分にフェルール１４とフェルールホルダを装着して、樹脂やテープで光ファイバケーブルの外被上に固定するような形態とすることもできる。また、心線対照用光ファイバの端部を、接着テープ等で光ファイバケーブルに巻き付けて固定してもよい。   In addition, the core wire contrast member 11a on the visible light source side and the core wire contrast member 11b on the fiber core contrast side can have the same shape that can be used together. In this case, the incident side of the light source of the cable and the core wire reference side can be set on either side, and there is no need to consider the cable laying direction when laying the cable. However, since the frequency of performing the core contrast is low, the core contrast member 11b on the core contrast side may be simplified. For example, a form in which the ferrule holding member is omitted, or a form in which the ferrule 14 and the ferrule holder are attached to the end portion of the optical fiber core that is taken out and fixed on the jacket of the optical fiber cable with resin or tape It can also be. Further, the end portion of the optical fiber for controlling the core wire may be wound and fixed around the optical fiber cable with an adhesive tape or the like.

本発明に使用される光ファイバケーブルの構成例を説明する図である。It is a figure explaining the structural example of the optical fiber cable used for this invention. 本発明によるコネクタ付光ファイバケーブルの構成例を説明する図である。It is a figure explaining the structural example of the optical fiber cable with a connector by this invention. 本発明で用いる心線対照部材の一例を説明する図である。It is a figure explaining an example of the core wire contrast member used by this invention. 本発明のコネクタ付光ファイバケーブルの使用形態を説明する図である。It is a figure explaining the usage pattern of the optical fiber cable with a connector of this invention.

符号の説明Explanation of symbols

１…多芯光ケーブル、１' …少芯光ケーブル、２，２'，２'' …光ファイバケーブル、３，３' …テンションメンバ、４…押え巻、５，５' …シース、６，６'，６'' …通信用光ファイバ心線、７…心線対照用光ファイバ心線、７ａ…端部分、８…高張力繊維、９…外被、９ａ…切り込み、１０，１０ａ，１０ｂ…光コネクタ、１１，１１ａ，１１ｂ…心線対照部材、１２ａ，１２ｂフェルール保持部材、１３…キャップ部材、１４…フェルール、１５…フェルールホルダ、１７ａ、１７ｂ…ケーブル挿通溝、１８ａ，１８ｂ…フェルール保持溝、１９ａ…凹部、２０ａ，２０ｂ…フェルール保持部材の前端面、２１…ファイバ貫通孔、２２…フェルール収納孔、２３…キャップ部材の前端面、２４…可視光光源、２５…光接続部材。 DESCRIPTION OF SYMBOLS 1 ... Multi-core optical cable, 1 '... Small-core optical cable, 2, 2', 2 '' ... Optical fiber cable, 3, 3 '... Tension member, 4 ... Presser winding, 5, 5' ... Sheath, 6, 6 ' , 6 '' ... optical fiber core for communication, 7 ... optical fiber core for contrast, 7a ... end portion, 8 ... high-tensile fiber, 9 ... jacket, 9a ... notch, 10, 10a, 10b ... light Connector, 11, 11a, 11b ... core wire contrast member, 12a, 12b ferrule holding member, 13 ... cap member, 14 ... ferrule, 15 ... ferrule holder, 17a, 17b ... cable insertion groove, 18a, 18b ... ferrule holding groove, 19a ... concave portion, 20a, 20b ... front end face of ferrule holding member, 21 ... fiber through hole, 22 ... ferrule housing hole, 23 ... front end face of cap member, 24 ... visible light source, 25 ... optical connecting member.

Claims (4)

両端に通信用の光コネクタが装着された光ファイバケーブルであって、通信用光ファイバ心線の他に、可視光による心線対照用の光ファイバ心線が収納されていることを特徴とするコネクタ付光ファイバケーブル。   An optical fiber cable having optical connectors for communication attached to both ends, wherein an optical fiber core wire for contrasting with visible light is housed in addition to the optical fiber core wire for communication Fiber optic cable with connector. 前記心線対照用の光ファイバ心線は、前記通信用光ファイバ心線の剛性の３／１０以下１／５０以上、外経の２／３以下１／５以上であることを特徴とする請求項１に記載のコネクタ付光ファイバケーブル。   The optical fiber core wire for contrasting the core wire is 3/10 or less 1/50 or more of the rigidity of the communication optical fiber core wire and 2/3 or less and 1/5 or more of the outer diameter. Item 14. An optical fiber cable with a connector according to Item 1. 一方の前記光コネクタの近傍で、前記心線対照用光ファイバに可視光を入射する心線対照部材が装着され、他方の前記光コネクタの近傍で、前記心線対照用光ファイバに可視光を出射する心線対照部材が装着されていることを特徴とする請求項１または２に記載のコネクタ付光ファイバケーブル。   In the vicinity of one of the optical connectors, a core wire contrast member for injecting visible light into the optical fiber for optical fiber comparison is attached, and in the vicinity of the other optical connector, visible light is applied to the optical fiber for optical fiber core contrast. The optical fiber cable with a connector according to claim 1 or 2, wherein an outgoing core wire reference member is attached. 前記可視光を入射する心線対照部材と、前記可視光を出射する心線対照部材とは、同じ部材であることを特徴とする請求３に記載のコネクタ付光ファイバケーブル。   4. The optical fiber cable with a connector according to claim 3, wherein the core wire contrast member that enters the visible light and the core wire contrast member that emits the visible light are the same member.
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