JPH0564325B2 - - Google Patents
Info
- Publication number
- JPH0564325B2 JPH0564325B2 JP59167569A JP16756984A JPH0564325B2 JP H0564325 B2 JPH0564325 B2 JP H0564325B2 JP 59167569 A JP59167569 A JP 59167569A JP 16756984 A JP16756984 A JP 16756984A JP H0564325 B2 JPH0564325 B2 JP H0564325B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- gas
- dam
- fiber cable
- tight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000013307 optical fiber Substances 0.000 claims description 102
- 239000000945 filler Substances 0.000 claims description 24
- 238000000576 coating method Methods 0.000 claims description 18
- 239000011248 coating agent Substances 0.000 claims description 17
- 239000000835 fiber Substances 0.000 claims description 7
- 229920001971 elastomer Polymers 0.000 claims description 5
- 239000005060 rubber Substances 0.000 claims description 5
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 239000004945 silicone rubber Substances 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims description 2
- 239000005062 Polybutadiene Substances 0.000 claims description 2
- 229920006311 Urethane elastomer Polymers 0.000 claims description 2
- 229920002857 polybutadiene Polymers 0.000 claims description 2
- 229920001083 polybutene Polymers 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005187 foaming Methods 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- -1 acrylic compound Chemical class 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920002050 silicone resin Polymers 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Light Guides In General And Applications Therefor (AREA)
Description
【発明の詳細な説明】
〔技術分野〕
本発明は複数の光フアイバ素線を平面状に並べ
被覆を施してなる光フアイバテープ心線を有する
ガスダム付光フアイバケーブルに関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an optical fiber cable with a gas dam, which has an optical fiber tape core formed by arranging a plurality of optical fibers in a plane and applying a coating.
近年、迫り来る高度情報化社会に備え、従来の
銅導体ケーブルから、伝送容量が大きく、細径か
つ軽量である等々の多くの特長を有する光フアイ
バケーブルへ、その切替が急ピツチで行われてい
る。ところで、この光フアイバケーブルにおいて
も、従来の銅導体ケーブル同様にガス保守型のガ
スダム付光フアイバケーブルが開発されている。
これは第５図が示すように、まず光フアイバケー
ブル１の外被２をダム形成部分にて必要長剥取り
複数の光フアイバ心線３を露出させ、続いて、こ
の光フアイバケーブル１の引張り強度向上のため
に、ケーブル１に挿入されている抗張力体４を、
ダム形成部内で一度切断した後、再び抗張力体接
続用スリーブ５で接続する。この理由は、この抗
張力体４沿いに発生する恐れのあるガスパスを遮
断するためである。次に、ダム形成部の線膨張係
数を光フアイバ心線３のそれと同じくして、熱膨
張によるガス洩れ、及び光フアイバ心線３に発生
するマイクロベンドによる伝送損失の増加を防止
するため、ダム形成部にかご状に設けるガラス繊
維強化プラスチツク（以下FRPと称す）製の棒
６を支持する目板７をダム形成部のＡ端に装着
し、他端にはダム形成部に続く接続箱に、該ダム
形成部を一体化させるために用いるフランジ８を
装着する。しかる後、目板７とフランジ８に跨つ
て前記FRP製の棒６をダム形成部内の光フアイ
バ心線３を包み込むようにかご状に配置し、両端
を目板７とフランジ８に固定する。さらに、前記
抗張力体４もその一端をフランジ８にネジ等で固
定する。また、光フアイバケーブル１のＡ端側外
被２上に接着、粘着テープ１０を巻き、ダム部形
成用充填材１１との接着性を向上させるようにせ
しめる。最後に、ダム形成部を覆うように、ウレ
タン樹脂等からなるダム部形成用充填材１１を充
填してガスダム部１２を形成する。このようなガ
スダム付光フアイバケーブルにあつて、光フアイ
バ心線３が、単に１心の光フアイバに何層かの被
覆を施してなる単心型の光フアイバ心線の場合
は、その気密性になんら問題は起らなかつた。と
ころが近年、光フアイバケーブルが急速に普及
し、高密度型ケーブルと称する、いわゆる、加入
者用光フアイバケーブルまで出現するに至り、こ
の高密度型光フアイバケーブルに対しても、第５
図に示した従来のガスダムを採用したところ、ガ
ス気密性に問題があることがわかつてきた。とこ
ろで、この加入者用の高密度型光フアイバケーブ
ルというのは、第２図が示すように、光フアイバ
のまわりにシリコーン等からなる緩衝層等を被覆
してなる光フアイバ素線１５を、例えば５本平面
状に並列に並べて光フアイバ素線１５の集合体を
形成し、該集合体の外側にナイロン等の熱可塑性
樹脂、あるいはアクリルコンパウンド等の紫外線
硬化性樹脂を被覆１６として設けた光フアイバテ
ープ心線１７を、抗張力体４のまわりに複数本集
合し、最後に外被２を被覆したものである。この
種のケーブルは、同一外径のケーブルにおいて比
較した場合、単心の光フアイバ心線を集合したも
のより、内部に収納される光フアイバ数が多いこ
とから高密度型光フアイバケーブルといわれ、そ
れ故、多心の光フアイバが収納される加入者用の
光フアイバケーブルに適している。
In recent years, in preparation for the fast-approaching information society, there has been a rapid switch from traditional copper conductor cables to optical fiber cables, which have many features such as large transmission capacity, small diameter, and light weight. There is. Incidentally, among these optical fiber cables, a gas maintenance type optical fiber cable with a gas dam has been developed, similar to the conventional copper conductor cable.
As shown in FIG. 5, the outer sheath 2 of the optical fiber cable 1 is first stripped off to a required length at the dam forming part to expose a plurality of optical fiber cores 3, and then the optical fiber cable 1 is stretched. In order to improve the strength, the tensile strength member 4 inserted into the cable 1 is
After cutting once within the dam forming part, the tensile strength member connecting sleeve 5 is used to connect again. The reason for this is to block a gas path that may occur along the tensile strength member 4. Next, the coefficient of linear expansion of the dam forming part is made the same as that of the optical fiber core 3, and in order to prevent gas leakage due to thermal expansion and increase in transmission loss due to microbends occurring in the optical fiber core 3, the dam is A batten 7 supporting a rod 6 made of glass fiber reinforced plastic (hereinafter referred to as FRP) provided in a basket shape in the dam formation part is attached to the A end of the dam formation part, and a connection box connected to the dam formation part is attached to the other end. , a flange 8 used for integrating the dam forming part is attached. Thereafter, the FRP rods 6 are arranged in a cage shape so as to straddle the batten 7 and the flange 8 so as to wrap around the optical fiber core 3 in the dam forming part, and both ends are fixed to the batten 7 and the flange 8. Furthermore, one end of the tensile strength member 4 is fixed to the flange 8 with a screw or the like. In addition, an adhesive tape 10 is wrapped around the outer sheath 2 on the A end side of the optical fiber cable 1 to improve the adhesion with the dam part forming filler 11. Finally, a gas dam part 12 is formed by filling a dam part forming filler 11 made of urethane resin or the like so as to cover the dam part. In such an optical fiber cable with a gas dam, if the optical fiber core 3 is a single core optical fiber core, which is simply a single optical fiber coated with several layers, its airtightness No problems occurred. However, in recent years, optical fiber cables have spread rapidly, and even so-called high-density fiber optic cables for subscribers have appeared.
When we adopted the conventional gas dam shown in the figure, we discovered that there were problems with gas tightness. By the way, this high-density optical fiber cable for subscribers is, as shown in FIG. Five optical fibers are arranged in parallel in a plane to form an assembly of optical fibers 15, and a thermoplastic resin such as nylon or an ultraviolet curable resin such as an acrylic compound is provided as a coating 16 on the outside of the assembly. A plurality of tape core wires 17 are assembled around the tensile strength member 4, and finally covered with the outer sheath 2. This type of cable is called a high-density optical fiber cable because, when comparing cables with the same outer diameter, the number of optical fibers housed inside is greater than that of a set of single optical fiber cores. Therefore, it is suitable for subscriber optical fiber cables containing multi-core optical fibers.
さて、このように光フアイバテープ心線１７を
有してなる光フアイバケーブル１に対して、第５
図のようなガスダム部１２を設け、ケーブルにガ
スを封入したところ、第２図における光フアイバ
素線１５と被覆１６とにより構成される隙間１
８、あるいはまた、光フアイバ素線１５同志が接
している界面１９や、光フアイバ素線１５と被覆
１６が接している界面２０を伝つてガスが洩れ、
従来の単心型の光フアイバ心線では問題とならな
かつた光フアイバ心線内に対するガス洩れ防止対
策が必要となつてきた。この問題に対してとられ
てきた従来の対策は、第２図における光フアイバ
素線１５の集合体に、シリコーン樹脂等をまず一
体的に被覆し、しかる後に被覆１６を施して、光
フアイバテープ心線１７の長手方向全長に亘つ
て、前記隙間１８や界面１９，２０からのガス洩
れを防止しようというものである。しかし、この
方法は、およそダム形成部にしか必要のない処理
をケーブル全長に亘つて施すといつた大きな無駄
に加えて、光フアイバ素線１５の集合体にシリコ
ーン樹脂等を一体的に被覆することにより、例え
ば、被覆厚の不均一等に帰因するマイクロベンド
により、伝送特性が劣化する等の問題もある。こ
のように光フアイバテープ心線を有するガスダム
付光フアイバケーブルにあつては、光フアイバテ
ープ心線内を伝つてガスが洩れるという特殊な事
情があるため、従来の単心型光フアイバ心線用の
ガスダムでは、ガス気密性に優れたガスダム付光
フアイバケーブルを得ることができなかつた。 Now, for the optical fiber cable 1 having the optical fiber tape core 17 in this way, the fifth
When the gas dam part 12 as shown in the figure is provided and the cable is filled with gas, the gap 1 formed by the optical fiber bare wire 15 and the coating 16 in FIG.
8, or alternatively, gas leaks through the interface 19 where the optical fibers 15 are in contact with each other, or the interface 20 where the optical fibers 15 and the coating 16 are in contact,
It has become necessary to take measures to prevent gas leakage into optical fibers, which has not been a problem with conventional single-core optical fibers. Conventional countermeasures taken against this problem have been to first integrally coat the assembly of optical fibers 15 in FIG. The purpose is to prevent gas leakage from the gap 18 and interfaces 19 and 20 over the entire length of the core wire 17 in the longitudinal direction. However, this method involves a great deal of waste in that it involves applying a treatment that is necessary only to the dam forming part over the entire length of the cable, and in addition, it requires integrally coating the aggregate of the optical fibers 15 with silicone resin or the like. As a result, there are problems such as deterioration of transmission characteristics due to, for example, microbends caused by non-uniform coating thickness. In this way, when it comes to optical fiber cables with gas dams that have optical fiber tape cores, there is a special situation in which gas leaks through the optical fiber tape core wires. However, it was not possible to obtain a fiber optic cable with a gas dam that had excellent gas-tightness.
前記問題に鑑み、本発明の目的は、光フアイバ
テープ心線を有する光フアイバケーブルにおい
て、ガス気密性に優れたガスダム付光フアイバケ
ーブルを提供することにある。
In view of the above problems, an object of the present invention is to provide an optical fiber cable with a gas dam that has excellent gas-tightness in an optical fiber cable having an optical fiber tape core.
前記目的を達成すべく本発明のガスダム付光フ
アイバケーブルは、光フアイバ素線を複数本平面
状に並列に並べ、そのまわりに被覆を設けてなる
光フアイバテープ心線を有する光フアイバケーブ
ルにあつて、該光フアイバケーブルの外被をダム
形成部分にて必要長剥取り、前記光フアイバテー
プ心線を露出し、この光フアイバテープ心線のま
わりにダム部形成用充填材を気密に充填してガス
ダム部を形成するガスダム付光フアイバケーブル
において、前記ガスダム部内にある前記光フアイ
バテープ心線には、その被覆を必要長剥取つて光
フアイバ素線を露出せしめた素線露出部が形成さ
れ、かつ該素線露出部両端の被覆に跨り、該素線
露出部の各光フアイバ素線の隙間を埋めつくすよ
うに、各光フアイバ素線のまわりにガス気密用充
填材が注入固化された心線ガス気密部が設けられ
ていることを特徴とするものである。
In order to achieve the above object, the optical fiber cable with a gas dam of the present invention is an optical fiber cable having an optical fiber tape core formed by arranging a plurality of optical fibers in parallel in a plane and providing a coating around them. Then, the required length of the outer sheath of the optical fiber cable is peeled off at the dam forming part to expose the optical fiber tape core, and a dam part forming filler is airtightly filled around the optical fiber tape core. In the optical fiber cable with a gas dam which forms a gas dam part, the optical fiber tape core wire in the gas dam part has a bare wire exposed part formed by stripping off a necessary length of the coating to expose the optical fiber wire. , and a gas-tight filler was injected and solidified around each optical fiber strand so as to straddle the coating at both ends of the exposed strand and completely fill the gap between each optical fiber strand in the exposed strand. It is characterized by being provided with a core gas-tight part.
本発明を図面を参照して詳細に説明する。第１
図は本発明のガスダム付光フアイバケーブルの一
実施例を示す。第１図が示すように、本発明のガ
スダム付光フアイバケーブルでは、まず光フアイ
バテープ心線１７を有する光フアイバケーブル１
の外被２をダム形成部分にて必要長剥取り、前記
光フアイバテープ心線１７を露出させる。続い
て、この光フアイバケーブル１に引張り強度向上
のため挿入されている抗張力体４を、ダム形成部
内で一度切断した後、再び抗張力体接続用スリー
ブ５で接続し、該抗張力体４に沿つて発生し易い
ガスパスを防止する。次に、第３図が示すように
前記露出させた光フアイバテープ心線１７のナイ
ロン、ポリエチレン等の熱可塑性樹脂またはエポ
キシアクリレート、ウレタンアクリレート等のア
クリル系樹脂等からなる被覆１６をダム形成部内
の適切な位置で必要長剥取り、光フアイバ素線１
５を露出させた素線露出部２１を形成する。そし
て、この素線露出部２１の両端の被覆１６，１６
に跨り、該素線露出部２１の各光フアイバ素線１
５，１５……の隙間を埋めつくすように、各光フ
アイバ素線１５，１５……のまわりにガス気密用
充填材２３が注入固化され、心線ガス気密部２５
が設けられる。因みに、この心線ガス気密部２５
を設ける一つの方法は以下のとおりである。ま
ず、前記素線露出部２１の長さより長い透明なス
リーブ（図示されていない）を、この素線露出部
２１の両端の被覆１６，１６に跨るようにして、
素線露出部２１にかぶせる。次に、このスリーブ
の一方の一端から、該スリーブの内側の隙間全体
に前記ガス気密用充填材２３を注射器等で注入す
る。このとき内部に気泡が残らぬよう透明なスリ
ーブを透して確認しながら注入し固化する。な
お、このガス気密用充填材２３としてはシリコー
ンゴム、ウレタン系ゴム、エポキシ系ゴム、ブタ
ジエンゴム、ポリブテンまたはこれらの変性され
たゴムなどを適宜選択すればよい。次に、スリー
ブ内のガス気密用充填材２３が固化したことを確
認したら、前記スリーブをとり除く。ここで、第
４図イが示すように、光フアイバテープ心線１７
を１本だけスリーブに入れて心線ガス気密部２５
を設けてもよいが、第４図ロのごとく、光フアイ
バテープ心線１７を２本あるいはそれ以上入れて
心線ガス気密部２５を設けてもよい。また、ガス
ダム部内において、第１図が示すように、前記心
線ガス気密部２５をその位置が長手方向に少しづ
つずれるように設ける方が作業性が良い。さて、
このようにして各心線ガス気密部２５を設けた
ら、次に、ダム形成部内の線膨張係数を光フアイ
バのそれと同じくして、熱膨張によるガス洩れ
や、マイクロベンドによる伝送損失の増加を防止
するため、ダム形成部にかご状に設けるFRP製
の棒６を支持する目板７をダム形成部のＡ端に装
着し、他端のＢ端にはフランジ８を装着する。し
かる後、目板７とフランジ８に跨つて、前記
FRP製の棒６をダム形成部内の光フアイバテー
プ心線１７を包むようにかご状に配置して、両端
を目板７とフランジ８に固定する。さらに、前記
抗張力体４もその一端をフランジ８に固定する。
次に、光フアイバケーブル１のＡ端側外被２上に
ダム部形成用充填材１１との接着性を高めるため
に接着、粘着性テープ１０を巻き、ダム形成部を
覆うように発泡ウレタン樹脂等からなるダム部形
成用充填材１１を気密に充填してガスダム部１２
を形成する。なお、このように発泡性樹脂をダム
部形成用充填材１１として使用する場合は、前記
心線ガス気密部２５を構成するガス気密用充填材
２３の固化後の硬度は重要である。何故なら、ダ
ム部形成用充填材１１が型内に充填され、発泡す
ると、この発泡に伴なう発泡圧力で、前記心線ガ
ス気密部２５が加圧される。この加圧でガス気密
用充填材２３にダム部形成用充填材１１が圧着
し、両者の界面のガスパスが遮断されるが、この
加圧が、光フアイバ素線１５にまで及ぶと伝送損
失の増加が心配される。それ故、ガス気密用充填
材２３の固化後の硬度はシヨアA40〜60程度が適
当で、この程度の硬度だと応力緩和効果を有する
ので前記発泡圧力を吸収してくれる。因みに、発
泡ウレタン樹脂からなるダム部形成用充填材１１
の発泡固化後の硬度はシヨアD40〜50程度であ
る。
The present invention will be explained in detail with reference to the drawings. 1st
The figure shows an embodiment of an optical fiber cable with a gas dam according to the present invention. As shown in FIG. 1, in the optical fiber cable with a gas dam of the present invention, first, an optical fiber cable 1 having an optical fiber tape core 17 is constructed.
The required length of the outer sheath 2 is peeled off at the dam forming portion to expose the optical fiber tape core 17. Subsequently, the tensile strength member 4 inserted into the optical fiber cable 1 to improve the tensile strength is cut once within the dam forming part, and then connected again with the tensile strength member connecting sleeve 5, and the tensile strength member 4 is cut along the tensile strength member 4. Prevents gas passes that are likely to occur. Next, as shown in FIG. 3, the exposed optical fiber tape core 17 is covered with a coating 16 made of a thermoplastic resin such as nylon or polyethylene or an acrylic resin such as epoxy acrylate or urethane acrylate within the dam forming part. Strip off the required length at the appropriate position, optical fiber strand 1
A strand exposed portion 21 is formed in which the strand 5 is exposed. Then, the coatings 16, 16 at both ends of the exposed wire portion 21
Each optical fiber strand 1 of the exposed strand 21
A gas-tight filler 23 is injected and solidified around each of the optical fibers 15, 15, so as to completely fill the gaps between the core wire gas-tight portions 25.
will be provided. Incidentally, this core wire gas-tight part 25
One way to provide this is as follows. First, a transparent sleeve (not shown) that is longer than the length of the wire exposed portion 21 is placed so as to straddle the coverings 16, 16 at both ends of the wire exposed portion 21.
Cover the bare wire exposed portion 21. Next, the gas-tight filler 23 is injected from one end of the sleeve into the entire gap inside the sleeve using a syringe or the like. At this time, pour it in and solidify while checking through the transparent sleeve to make sure there are no air bubbles left inside. The gas-tight filler 23 may be appropriately selected from silicone rubber, urethane rubber, epoxy rubber, butadiene rubber, polybutene, or modified rubbers thereof. Next, after confirming that the gas-tight filler 23 within the sleeve has solidified, the sleeve is removed. Here, as shown in FIG. 4A, the optical fiber tape core 17
Put only one wire into the sleeve and seal it in the gas-tight part 25.
Alternatively, as shown in FIG. 4B, two or more optical fiber tape cores 17 may be inserted to provide a core gas-tight portion 25. Further, as shown in FIG. 1, it is better to provide the core gas-tight portions 25 in the gas dam portion so that their positions are shifted little by little in the longitudinal direction for better workability. Now,
After each fiber gas-tight part 25 is provided in this way, next, the coefficient of linear expansion in the dam forming part is made the same as that of the optical fiber to prevent gas leakage due to thermal expansion and increase in transmission loss due to microbending. In order to do this, a batten 7 supporting a cage-shaped FRP rod 6 provided in the dam forming part is attached to the A end of the dam forming part, and a flange 8 is attached to the other end B end. After that, the above-mentioned
A rod 6 made of FRP is arranged in a cage shape so as to wrap around the optical fiber tape core 17 in the dam forming part, and both ends are fixed to the batten 7 and the flange 8. Further, one end of the tensile strength member 4 is also fixed to the flange 8.
Next, an adhesive tape 10 is wrapped around the A-end side sheath 2 of the optical fiber cable 1 in order to improve the adhesion with the dam forming filler 11, and a foamed urethane resin is applied to cover the dam forming part. The gas dam part 12 is airtightly filled with a dam part forming filler 11 consisting of, etc.
form. In addition, when a foamable resin is used as the dam part forming filler 11 in this way, the hardness of the gas-tight filler 23 constituting the core wire gas-tight part 25 after solidification is important. This is because when the dam part forming filler 11 is filled into the mold and foamed, the core wire gas-tight part 25 is pressurized by the foaming pressure accompanying this foaming. Due to this pressurization, the dam part forming filler 11 is pressed against the gas-tight filler 23, and the gas path at the interface between the two is cut off. However, if this pressurization reaches the optical fiber 15, transmission loss will occur. There are concerns about the increase. Therefore, the hardness of the gas-tight filler 23 after solidification is suitably about A40 to A60, and this hardness has a stress relaxation effect and can absorb the foaming pressure. Incidentally, the dam part forming filler 11 made of foamed urethane resin
The hardness after foaming and solidification is about Shore D40-50.
ここで本発明の具体例を１つ示す。まず、外径
125μｍの光フアイバにシリコーン樹脂を被覆し
て外径300μｍの光フアイバ素線１５を得る。こ
の光フアイバ素線１５を５本、第２図のように並
列に並べ、ナイロンよりなる被覆１６を施し、幅
1.6mm、厚み0.45mmの光フアイバテープ心線１７
を形成し、しかる後、この光フアイバテープ心線
１７を100本含む光フアイバケーブルを形成した。
この光フアイバケーブルに本発明に基づくガスダ
ム部１２を形成した。この時用いた材料は以下の
とおりである。
Here, one specific example of the present invention will be shown. First, the outer diameter
An optical fiber 15 having an outer diameter of 300 μm is obtained by coating a 125 μm optical fiber with silicone resin. Five of these optical fiber wires 15 are arranged in parallel as shown in FIG. 2, coated with a nylon coating 16, and
1.6mm, 0.45mm thick optical fiber tape core 17
After that, an optical fiber cable including 100 optical fiber tape core wires 17 was formed.
A gas dam portion 12 according to the present invention was formed on this optical fiber cable. The materials used at this time are as follows.
Γガス気密用充填材２３；
熱硬化型シリコーンゴム（80℃〜90℃にて20
分加熱後の硬度シヨアA40〜60）
Γダム部形成用充填材１１；
発泡ウレタン樹脂（発泡率10％、発泡固化後
の硬度シヨアD40〜50）
以上の材料を用いた本発明によるガスダム付光
フアイバケーブルにおいて、−30℃〜＋70℃２サ
イクル／日のヒートサイクル試験を行なつた。結
果は100サイクル後20℃でガス圧１Kg／cm2を加え
てもなんら変化はなかつた。因みに、従来方法に
よるものにあつては、20℃で１Kg／cm2のガス圧を
加えると、直ちに、光フアイバテープ心線１７内
をガスが通過してしまつた。Γ Gas airtight filler 23; Thermosetting silicone rubber (20℃ at 80℃~90℃
Light with gas dam according to the present invention using the above-mentioned materials. A heat cycle test of -30°C to +70°C 2 cycles/day was conducted on the fiber cable. The results showed that after 100 cycles, there was no change even when a gas pressure of 1 Kg/cm 2 was applied at 20°C. Incidentally, in the conventional method, when a gas pressure of 1 kg/cm 2 was applied at 20° C., the gas immediately passed through the optical fiber tape core 17.
このように本発明にあつては、ダム形成部内に
おいて、光フアイバテープ心線の被覆を数cm程剥
取り、素線露出部を形成し、しかる後、その部分
にガス気密用充填材を充填固化してなる心線ガス
気密部が設けられているため、この心線ガス気密
部がいわば各光フアイバテープ心線におけるガス
ダムの役割を果してくれる。それ故、従来問題と
なつていた光フアイバテープ心線内を伝つてのガ
ス洩れは防止される。 In this way, in the present invention, within the dam forming part, the coating of the optical fiber tape core wire is peeled off by several centimeters to form an exposed part of the strands, and then that part is filled with a gas-tight filler. Since a solidified core gas-tight portion is provided, this core gas-tight portion serves, so to speak, as a gas dam in each optical fiber tape core. Therefore, gas leakage through the inside of the optical fiber tape, which has been a problem in the past, is prevented.
以上説明したように、本発明によれば、光フア
イバテープ心線を有する光フアイバケーブルにお
いて、ガス気密性に優れたガスダム付光フアイバ
ケーブルを得ることができる。
As described above, according to the present invention, it is possible to obtain an optical fiber cable with a gas dam having excellent gas-tightness in an optical fiber cable having an optical fiber tape core.
第１図は本発明のガスダム付光フアイバケーブ
ルの一実施例を示す縦断面図、第２図は本発明に
係る光フアイバテープ心線の横断面図、第３図は
本発明に係る光フアイバテープ心線の心線ガス気
密部を示す拡大縦断面図、第４図イ，ロは第１図
の心線ガス気密部の一実施例及び他の実施例を示
す拡大横断面図、第５図は従来のガスダム付光フ
アイバケーブルの縦断面図である。
１…光フアイバケーブル、１１…ダム部形成用
充填材、１２…ガスダム部、１５…光フアイバ素
線、１６…被覆、１７…光フアイバテープ心線、
２１…素線露出部、２３…ガス気密用充填材、２
５…心線ガス気密部。
FIG. 1 is a longitudinal cross-sectional view showing an embodiment of an optical fiber cable with a gas dam according to the present invention, FIG. 2 is a cross-sectional view of an optical fiber ribbon according to the present invention, and FIG. 3 is a cross-sectional view of an optical fiber ribbon according to the present invention. FIG. 4A and B are enlarged cross-sectional views showing one embodiment and another embodiment of the fiber gas-tight portion in FIG. 1; FIG. The figure is a longitudinal sectional view of a conventional optical fiber cable with a gas dam. DESCRIPTION OF SYMBOLS 1... Optical fiber cable, 11... Filler for dam part formation, 12... Gas dam part, 15... Optical fiber wire, 16... Coating, 17... Optical fiber tape core wire,
21... Wire exposed portion, 23... Gas-tight filler, 2
5... Core wire gas-tight part.
Claims (1)
べ、そのまわりに被覆を設けてなる光フアイバテ
ープ心線を有する光フアイバケーブルにあつて、
該光フアイバケーブルの外被をダム形成部分にて
必要長剥取り、前記光フアイバテープ心線を露出
し、この光フアイバテープ心線のまわりにダム部
形成用充填材を気密に充填してガスダム部を形成
するガスダム付光フアイバケーブルにおいて、前
記ガスダム部内にある前記光フアイバテープ心線
には、その被覆を必要長剥取つて光フアイバ素線
を露出せしめた素線露出部が形成され、かつ該素
線露出部両端の被覆に跨り、該素線露出部の各光
フアイバ素線の隙間を埋めつくすように、各光フ
アイバ素線のまわりにガス気密用充填材が注入固
化された心線ガス気密部が設けられていることを
特徴とするガスダム付光フアイバケーブル。 ２ 前記ガス気密用充填材はシリコーンゴム、ブ
タジエンゴム、ウレタン系ゴム、エポキシ系ゴ
ム、ポリブテンまたはこれらゴムが変性されたゴ
ムであることを特徴とする特許請求の範囲第１項
記載のガスダム付光フアイバケーブル。[Scope of Claims] 1. An optical fiber cable having an optical fiber tape core formed by arranging a plurality of optical fibers in parallel in a plane and providing a coating around the fibers,
The required length of the outer sheath of the optical fiber cable is peeled off at the dam forming part to expose the optical fiber tape core, and a dam part forming filler is airtightly filled around the optical fiber tape core to form a gas dam. In the optical fiber cable with a gas dam forming a part, the optical fiber tape core wire in the gas dam part has an exposed part formed by stripping off a necessary length of the coating to expose the optical fiber wire, and A core wire in which a gas-tight filler is injected and solidified around each optical fiber strand so as to straddle the coating at both ends of the exposed strand and completely fill the gap between each optical fiber strand in the exposed strand. An optical fiber cable with a gas dam characterized by being provided with a gas-tight part. 2. A light with a gas dam according to claim 1, wherein the gas-tight filler is silicone rubber, butadiene rubber, urethane rubber, epoxy rubber, polybutene, or a modified rubber of any of these rubbers. fiber cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59167569A JPS6146916A (en) | 1984-08-10 | 1984-08-10 | Optical fiber cable provided with gas dam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59167569A JPS6146916A (en) | 1984-08-10 | 1984-08-10 | Optical fiber cable provided with gas dam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6146916A JPS6146916A (en) | 1986-03-07 |
| JPH0564325B2 true JPH0564325B2 (en) | 1993-09-14 |
Family
ID=15852164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59167569A Granted JPS6146916A (en) | 1984-08-10 | 1984-08-10 | Optical fiber cable provided with gas dam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6146916A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012150360A (en) * | 2011-01-20 | 2012-08-09 | Mitsubishi Cable Ind Ltd | Optical fiber wiring structure and manufacturing method thereof |
-
1984
- 1984-08-10 JP JP59167569A patent/JPS6146916A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6146916A (en) | 1986-03-07 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |