JPH01118809A - Juncture of optical fiber-containing metallic tube - Google Patents
Juncture of optical fiber-containing metallic tubeInfo
- Publication number
- JPH01118809A JPH01118809A JP27567487A JP27567487A JPH01118809A JP H01118809 A JPH01118809 A JP H01118809A JP 27567487 A JP27567487 A JP 27567487A JP 27567487 A JP27567487 A JP 27567487A JP H01118809 A JPH01118809 A JP H01118809A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- optical fiber
- connecting tube
- metal
- cladding
- 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.)
- Pending
Links
- 239000013307 optical fiber Substances 0.000 title claims description 63
- 238000005253 cladding Methods 0.000 claims abstract description 61
- 229910052751 metal Inorganic materials 0.000 claims description 44
- 239000002184 metal Substances 0.000 claims description 44
- 239000000463 material Substances 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims 2
- 238000003466 welding Methods 0.000 description 31
- 239000000835 fiber Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000005219 brazing Methods 0.000 description 4
- 238000013021 overheating Methods 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- -1 silica sand Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Mechanical Coupling Of Light Guides (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は金属製被覆管内に光ファイバが挿通された光
ファイバ入り金属管 （すなわち、光フアイバ心線、光
フアイバコードまたは光フアイバケーブル）の接続部に
関する。Detailed Description of the Invention (Field of Industrial Application) This invention relates to a metal tube containing an optical fiber (that is, an optical fiber core, an optical fiber cord, or an optical fiber cable) in which an optical fiber is inserted into a metal cladding tube. Regarding the connection part.
この発明における光ファイバとは、コアとクラッド層か
らなるファイバ素線、このファイバ素線に合成樹脂、金
属、セラミックスなどでコーティングしたもの、ならび
にこれらの単心のもの、多心のもの、およびより線のも
のをいう。また、被覆管とは鋼、銅、鉛、アルミニウム
その他の金属管をいう。The optical fiber in this invention includes a fiber wire consisting of a core and a cladding layer, a fiber coated with synthetic resin, metal, ceramics, etc., and single-core fibers, multi-core fibers, and more. It refers to a line. In addition, cladding refers to steel, copper, lead, aluminum, and other metal tubes.
（従来の技術）
架空、海底、地下などに延線される光ファイバは、過度
の張力を防止し、あるいは耐環境性を持だせるために金
属管などで被覆して用いられることがある。たとえば、
近年広く用いられるようになった光通信ケーブルは、光
ファイバが強度的に弱いことから、金属製被覆管に挿通
された光ファイバが要求されるようになって来ている。(Prior Art) Optical fibers that are extended over the air, under the sea, underground, etc. are sometimes covered with metal tubes or the like to prevent excessive tension or to provide environmental resistance. for example,
Optical communication cables that have become widely used in recent years are required to have optical fibers inserted through metal cladding tubes because the optical fibers are weak in strength.
また、海底光ケーブルのように長距離間に延線されるも
のでは、光ファイバ入り金属管どうしが接続される。こ
のような接続では、接続部において被覆管どうしの間に
若干の隙間が生じ、隙間を補うために接続管あるいは接
続筒を介して被覆管を接続する。光ファイバ入り金属管
どうしの接続として、たとえば実開昭５９−３３０１５
号公報、実開昭５９−１３６６０９号公報または特開昭
５９−１８４３１３号公報で開示された光ファイバの接
続部がある。Furthermore, in cables that are extended over long distances, such as submarine optical cables, metal tubes containing optical fibers are connected to each other. In such a connection, a slight gap is created between the cladding tubes at the connection portion, and in order to compensate for the gap, the cladding tubes are connected via a connecting tube or a connecting tube. As a connection between metal tubes containing optical fibers, for example, Utility Model Application No. 59-33015
There is an optical fiber connection portion disclosed in Japanese Patent Application Laid-Open No. 1984-136609 or Japanese Patent Application Laid-Open No. 59-184313.
実開昭５９−３３０１５号公報で開示された接続部は、
光フアイバケーブルの接続部分が接続筒を介して被覆さ
れ、接続筒と光フアイバケーブルのシースとの接続部が
溶着または溶接により一体化されている。実開昭５９−
１３６６０９号公報で開示された接続部は、接続する被
覆管の外径より僅かに大きい内径を存する金属スリーブ
を被覆管の対向する接続端に掛は渡して係合部を被覆管
に重ね合せ、係合部の突起を被覆管に食い込ませて圧着
固定し、さらに被覆管と金属スリーブの継目をはんだシ
ールしている。また、特開昭５９−１８４３１３号公報
で開示された接続部は、金属コート光ファイバの接続部
あるいは終端部に金属スリーブを被ぶせ、ついで金属コ
ート光ファイバと金属スリーブとを低融点ろうを用いて
ろう付けしている。The connection part disclosed in Utility Model Application Publication No. 59-33015 is
The connecting portion of the optical fiber cable is covered with a connecting tube, and the connecting portion of the connecting tube and the sheath of the optical fiber cable are integrated by welding or welding. Utsukai Showa 59-
In the connection part disclosed in Japanese Patent No. 136609, a metal sleeve having an inner diameter slightly larger than the outer diameter of the cladding tube to be connected is passed over the opposing connection ends of the cladding tube, and the engaging part is overlapped with the cladding tube. The protrusion of the engaging portion is inserted into the cladding tube and fixed by pressure, and the joint between the cladding tube and the metal sleeve is sealed with solder. Furthermore, the connection part disclosed in Japanese Patent Application Laid-open No. 59-184313 covers the connection part or the terminal end of a metal-coated optical fiber with a metal sleeve, and then connects the metal-coated optical fiber and the metal sleeve using a low-melting-point solder. It is soldered.
（発明が解決しようとする問題点）
従来の光ファイバ入り金属管の接続部には、次のような
問題があった。(Problems to be Solved by the Invention) The conventional joints of metal tubes containing optical fibers have the following problems.
強度および気密性の点から、光ファイバ入り金属管の被
覆管の外径と接続管の内径との差は小さいほどよい。し
かし、径差を小さくすると、被覆管と接続管とのはめ合
い部を高い寸法精度で機械加工しなければならない。被
覆管の外径および肉厚が数ｍｍ以下と小さくなると、こ
のような機械加工は困難で李った。特に、接続現場では
極めて困難であった。このために、やすり掛け、グライ
ンデインクなど現物合わせ加工を行ない、長時間をかけ
て接続管を被覆管の外側にはめ合わせていた。From the viewpoint of strength and airtightness, the smaller the difference between the outer diameter of the cladding tube of the optical fiber-containing metal tube and the inner diameter of the connecting tube, the better. However, when reducing the diameter difference, the fitting portion between the cladding tube and the connecting tube must be machined with high dimensional accuracy. When the outer diameter and wall thickness of the cladding tube become small, such as several mm or less, such machining becomes difficult. This was especially difficult at the connection site. For this purpose, actual fitting processes such as sanding and grinding were performed, and it took a long time to fit the connecting tube to the outside of the cladding tube.
また、被覆管と接続管との溶接時に、溶融金属の溶落ち
を生じ、溶接部の強度または気密性を低下する虞れがあ
った。さらに、光ファイバと被覆管との径差が小さいと
、光ファイバが過熱されて劣化する虞れもあフた。Furthermore, when welding the cladding tube and the connecting tube, there is a risk that molten metal may burn through, reducing the strength or airtightness of the welded portion. Furthermore, if the diameter difference between the optical fiber and the cladding tube is small, there is a risk that the optical fiber will be overheated and deteriorated.
そこで、この発明は光ファイバ入り金属管を簡単かつ迅
速に接続することができる光ファイバ入り金属管の接続
部を提供しようとするものである。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a connecting section for metal tubes containing optical fibers, which can easily and quickly connect metal tubes containing optical fibers.
また、この発明は強度および気密性に優れた溶゛ 接
接線部を得ることができ、しかも接続時に光ファイバが
劣化することのない光ファイバ入り金属管の接続部を提
供しようとするものである。Further, the present invention aims to provide a connecting section for metal tubes containing optical fibers, which can obtain a welded tangential section with excellent strength and airtightness, and which does not cause deterioration of the optical fiber during connection. .
（問題点を解決するための手段）
第１の発明による光ファイバ入り金属管の接続部は、被
覆管端部外側および接続管端部内側の少くとも一つに接
続管の長手方向中央に向かうに従い被覆管端部外径また
は接続管端部内径が小さくなるテーパーまたはアールが
形成されており、被覆管外周面と接続管端との間がシー
ル溶接されている。(Means for Solving the Problems) The connecting portion of the optical fiber-containing metal tube according to the first invention is directed toward the longitudinal center of the connecting tube at least one of the outer side of the cladding tube end and the inner side of the connecting tube end. Accordingly, a taper or radius is formed in which the outer diameter of the cladding tube end or the inner diameter of the connecting tube end becomes smaller, and the outer peripheral surface of the cladding tube and the connecting tube end are seal-welded.
接続管は光ファイバが挿通された被覆管と同材質の金属
で作ることが好ましい。被覆管からの光ファイバの露出
長さと光ファイバの接合による光ファイバの長さ変化を
計算に入れて、接続管長さを常に一定にするよう標準化
しておけば、場所を選ばず光ファイバ入り金属管の接続
が可能となる。被覆管と接続管との径差の程度は、両管
が軽く摺動する程度が望ましい。被覆管端部外側または
接続管端部内側にテーパーまたはアールを形成するには
、旋削、研削などの機械加工による。肉厚が薄い接続管
の場合には、管端部を押し広げるようにして塑性変形さ
せ、テーパーを形成するようにしてもよい。The connecting tube is preferably made of the same metal as the cladding tube through which the optical fiber is inserted. If you take into account the exposed length of the optical fiber from the cladding tube and the change in the length of the optical fiber due to joining the optical fibers, and standardize the connecting tube so that the length is always constant, you can use metal with optical fibers anywhere. Pipes can be connected. The difference in diameter between the cladding tube and the connecting tube is preferably such that both tubes can easily slide. To form a taper or radius on the outside of the cladding tube end or the inside of the connecting tube end, machining such as turning or grinding is used. In the case of a connecting tube with a thin wall, the tube end may be plastically deformed by pushing it apart to form a taper.
シール溶接は、通常の融接、圧接、あるいはろう接によ
り行なう。融接としてはプラズマアーク溶接、レーザ溶
接、光ビーム溶接、電子ビーム溶接、ティクアーク溶接
、ガス溶接、抵抗溶接方法などが利用できる。Seal welding is performed by conventional fusion welding, pressure welding, or brazing. As fusion welding, plasma arc welding, laser welding, light beam welding, electron beam welding, tick arc welding, gas welding, resistance welding, etc. can be used.
第２の発明による光ファイバ入り金属管の接続部は、上
記接続部において被覆管および接続管内に裏当て材が挿
入されている。In the connecting portion of the optical fiber-containing metal tube according to the second aspect of the invention, a backing material is inserted into the cladding tube and the connecting tube at the connecting portion.
裏当て材の形状は管状とすることが望ましく、また被覆
管および接続管内に破砕した裏当て材が飛散しないよう
にアルミ箔などで内張すするのがよい。また、裏当て材
は溶接箇所に密着することが望ましく、このために裏当
て材表面にガラスウールなどを薄く付着させておくとよ
い。裏当て材は珪砂、アルミナ、ジルコンサンド、マグ
ネシア、コージライト等の金属酸化物を主成分とした混
合物で作られる。The shape of the backing material is preferably tubular, and it is preferably lined with aluminum foil or the like to prevent the crushed backing material from scattering inside the cladding tube and connecting tube. Further, it is desirable that the backing material adhere closely to the welding area, and for this purpose, it is preferable to apply a thin layer of glass wool or the like to the surface of the backing material. The backing material is made of a mixture based on metal oxides such as silica sand, alumina, zircon sand, magnesia, and cordierite.
（作用）
この発明による光ファイバ入り金属管の接続部は、被覆
管端部外側および接続管端部内側の少くとも一つに接続
管の長手方向中央に向かうに従い被覆管端部外径または
接続管端部内径が小さくなるテーパーまたはアールが形
成されている。そして、被覆管の外側に接続管をはめ合
わせるときに、被覆管または接続管の端部はテーパーま
たはアールに案内され、はめ合わせられる。したがって
、被覆管と接続管との間の径差が僅かであっても、はめ
合わせ作業は容易となり、迅速に行なうことができる。(Function) The connection portion of the optical fiber-containing metal tube according to the present invention has at least one of the outer side of the cladding tube end and the inner side of the connecting tube end. A taper or radius is formed where the inner diameter of the tube end becomes smaller. When fitting the connecting tube to the outside of the cladding tube, the ends of the cladding tube or the connecting tube are guided into a taper or radius and are fitted together. Therefore, even if the difference in diameter between the cladding tube and the connecting tube is small, the fitting operation can be performed easily and quickly.
また、裏当て材は、溶接時において溶融金属の溶落ちお
よび光ファイバの過熱を防ぐ。The backing material also prevents molten metal from burning through and overheating the optical fiber during welding.
（実施例工）
第１図は第１の発明による光ファイバ入り金属管の接続
部８の一例を拡大して示している。(Example Work) FIG. 1 shows an enlarged example of a connecting portion 8 of an optical fiber-containing metal tube according to the first invention.
光ファイバ１は石英ガラス素線（径＋２５ＪＪＩＩ１）
２にシリコン樹脂を一次コーティングし、ウレタン樹
脂を二次コーティングしたもので、直径は０．４ｍｍで
ある。左右の光ファイバ１の素線２は接合部３で加熱融
着されている。Optical fiber 1 is a quartz glass wire (diameter + 25JJII1)
2, which was first coated with silicone resin and secondly coated with urethane resin, and has a diameter of 0.4 mm. The strands 2 of the left and right optical fibers 1 are heat-fused at a joint 3.
光ファイバ１が挿通された被覆管５は、外径１．１ｍｍ
、内径０ 、８ｍｍのステンレス鋼管（ＳＵＳ３０４
）よりなり、長さは５ ｋｍである。The cladding tube 5 into which the optical fiber 1 is inserted has an outer diameter of 1.1 mm.
, inner diameter 0, 8mm stainless steel pipe (SUS304
) and has a length of 5 km.
接続管１１は外径１．６ｍｍ、内径１．２ｍｍのステン
レス鋼管（ＳＵＳ３０４）よりなり、長さは２５０ ｍ
ｍである。この接続管１１の長さは、接続に必要な長さ
だけ光ファイバ１を被覆管５から露出させた長さの約１
．２５倍に等しい。接続管１１の管端部は押し広げられ
てテーパー１２となっている。The connecting pipe 11 is made of stainless steel pipe (SUS304) with an outer diameter of 1.6 mm and an inner diameter of 1.2 mm, and has a length of 250 m.
It is m. The length of this connecting tube 11 is approximately 1 of the length of the optical fiber 1 exposed from the cladding tube 5 by the length necessary for connection.
．． Equal to 25 times. The end of the connecting pipe 11 is expanded to form a taper 12.
被覆管５の外周面と接続管１１の端部とはシール溶接Ｓ
されている。The outer peripheral surface of the cladding tube 5 and the end of the connecting tube 11 are seal welded S.
has been done.
（実施例■）
第２図は第２の発明の実施例であり、光ファイバ入り金
属管の接続部８を拡大して示している。(Embodiment ■) FIG. 2 shows an embodiment of the second invention, and shows a connecting portion 8 of a metal tube containing an optical fiber in an enlarged manner.
第１図に示す実施例の要素と同じものには同一の参照符
号をつけ、その説明は省略する。また、光ファイバ、被
覆管および接続管の材質および寸法も実施例工のものと
同じである。Elements that are the same as those in the embodiment shown in FIG. 1 are given the same reference numerals, and their explanations will be omitted. Furthermore, the materials and dimensions of the optical fiber, cladding tube, and connecting tube are the same as those of the example.
接続管１４の管端は外側に折り曲げられて環状フィレッ
ト１５が形成され、またアール状に面取り１６されてい
る。このフィレット１５は放熱を助けて溶接熱の集中を
防ぐとともに、溶加材となって溶接強度を高める。この
結果、良好な溶接部を得ることができる。The tube end of the connecting tube 14 is bent outward to form an annular fillet 15, and is chamfered 16 in a rounded shape. This fillet 15 helps in heat dissipation to prevent concentration of welding heat, and serves as a filler metal to increase welding strength. As a result, a good welded part can be obtained.
裏当て管２１が被覆管５および接続管１４内にシール溶
接部Ｓに合うようにして２個挿入されている。裏当て管
２１はアルミナを主成分とした混合物で作られ、厚さは
０．１２ｍｍ、外径は０．８ｍｍ、長さは５０ｍｍであ
る。Two backing tubes 21 are inserted into the cladding tube 5 and the connecting tube 14 so as to match the seal welds S. The backing tube 21 is made of a mixture mainly composed of alumina, and has a thickness of 0.12 mm, an outer diameter of 0.8 mm, and a length of 50 mm.
（実施例■）
第３図は第２の発明の他の実施例であり、光ファイバ入
り金属管の接続部８を拡大して示している。第２図に示
す実施例の要素と同じものには同一の参照符号をつけ、
その説明は省略する。また、光ファイバ１、被覆管５お
よび接続管１８の材質および寸法も実施例Ｈのものと同
じである。(Embodiment ■) FIG. 3 shows another embodiment of the second invention, and shows a connecting portion 8 of a metal tube containing an optical fiber in an enlarged manner. Elements that are the same as those in the embodiment shown in FIG. 2 are given the same reference numerals;
The explanation will be omitted. Furthermore, the materials and dimensions of the optical fiber 1, cladding tube 5, and connecting tube 18 are also the same as those in Example H.
被覆管５の先端部には、先細りとなったテーパー６が設
けられている。一方、接続管１８は直管となっている。A tapered taper 6 is provided at the tip of the cladding tube 5. On the other hand, the connecting pipe 18 is a straight pipe.
ここで、光ファイバ入り金属管の接続方法について、第
３図に示す接続部８を例として説明する。Here, a method for connecting metal tubes containing optical fibers will be explained using the connection section 8 shown in FIG. 3 as an example.
光ファイバ１を接続に必要な長さだけ被覆管５から露出
させる。ついで、接続管１８を被覆管５の外側にはめ合
わせ、露出個所を覆わないように後退させる。また、光
ファイバ１を内部に通しながら裏当て管２１を被覆管５
内に挿入し、接続管１８と同様に露出個所を覆わないよ
うに後退させる。The optical fiber 1 is exposed from the cladding tube 5 by the length necessary for connection. Next, the connecting tube 18 is fitted onto the outside of the cladding tube 5 and is retreated so as not to cover the exposed portion. Also, while passing the optical fiber 1 inside, the backing tube 21 is inserted into the cladding tube 5.
The tube is inserted into the tube and, like the connecting tube 18, is withdrawn so as not to cover the exposed portion.
以上のようにして接続準備が終ったならば、光フアイバ
素線２の接合部３を加熱し、光ファイバ１を接続する。After the preparation for connection is completed as described above, the joint portion 3 of the optical fiber strand 2 is heated and the optical fiber 1 is connected.
ついで、裏当て管２１をシール溶接部Ｓに位置調整する
。また、接続管１８を引き寄せて被覆管５の間の隙間を
覆う。そして、被覆管５の外周面と接続管１８の端部と
の間をシール溶接Ｓする。この実施例では、プラズマア
ーク溶接によりシール溶接を行なった。溶接条件は次ぎ
の通りである。Next, the backing tube 21 is positioned at the seal weld S. Further, the connecting tube 18 is pulled closer to cover the gap between the cladding tubes 5. Then, seal welding S is performed between the outer circumferential surface of the cladding tube 5 and the end of the connecting tube 18. In this example, seal welding was performed by plasma arc welding. The welding conditions are as follows.
溶接電流：０．７Ａ
溶接電圧＝５０■
パルス周波数：３Ｈｚ
シールドガス： Ａｒ＋ ７！Ｉｉ Ｈ２Ｓ Ｉｔ ／
ｍｉｎ溶接速度： ３．ＯｃＬＩＩ／ｍｉｎ
溶加材：なし
なお、被覆管５および接続管１８を水冷チャックにより
保持し、過大な溶接熱で被覆管５あるいは接続管１８に
穴があいたり、溶落ちを生じたり、あるいは光ファイバ
１が過熱したりするのを防止した。Welding current: 0.7A Welding voltage = 50■ Pulse frequency: 3Hz Shielding gas: Ar+ 7! Ii H2S It /
min welding speed: 3. OcLII/min Filler metal: None Please note that the cladding tube 5 and connecting tube 18 are held by a water-cooled chuck, and excessive welding heat may cause holes or burn-through in the cladding tube 5 or connecting tube 18, or light This prevents the fiber 1 from overheating.
上記実施例では、シール溶接をプラズマアーク溶接によ
り行なったが、これら溶接の代わりにろう付を用いるこ
ともできる。この場合には、接合部にろう材を置き、電
気抵抗加熱を利用してろう付けする。In the above embodiment, seal welding was performed by plasma arc welding, but brazing may be used instead of welding. In this case, a brazing material is placed at the joint and brazing is performed using electrical resistance heating.
この発明は上記実施例に限られるものではなく、たとえ
ば管内への光ファイバ１の供給は、１本のみに限らず管
内径と光フアイバ１径との関連で複数本でも可能である
。また、被覆管および接続管の両方にテーパーあるいは
アールを設けるようにしてもよい。The present invention is not limited to the above-mentioned embodiments, and for example, the supply of the optical fiber 1 into the tube is not limited to one, but may include a plurality of optical fibers depending on the inner diameter of the tube and the diameter of the optical fiber 1. Further, both the cladding tube and the connecting tube may be tapered or rounded.
（発明の効果）
この発明による光ファイバ入り金属管の接続部は、被覆
管または接続管の端部がテーパーまたはアールに案内さ
れてはめ合わせられるので、はめ合わせ作業は容易であ
り、迅速に光ファイバ入り金属管を接続することができ
る。(Effects of the Invention) In the connection part of the optical fiber-containing metal tube according to the present invention, the ends of the cladding tube or the connection tube are guided in a tapered or rounded shape and are fitted together, so the fitting operation is easy and the optical fiber can be quickly illuminated. Fiber-filled metal tubes can be connected.
また、接続部に裏当て材を設けることにより、溶接時に
おいて溶落ちおよび光ファイバの過熱を防ぐことができ
る。Further, by providing a backing material at the connection part, burn-through and overheating of the optical fiber can be prevented during welding.
第１図および第２図はそれぞれ第１および第２の発明の
実施例であり、光ファイバ入り金属管の接続部の拡大断
面図、ならびに第３図は第２の発明の他の実施例であり
、光ファイバ入り金属管の接続部の拡大断面図である。
１・・・光ファイバ、５・・・被覆管、６・・・テーパ
ー、８・・・接続部、１１ 、１４ 、１８−・・接続
管、ｌ ２−・・テーパー、１６−・・アール、２１・
・・裏当て管、Ｓ・・・シール溶接（部）。1 and 2 are embodiments of the first and second inventions, respectively, and FIG. 3 is an enlarged sectional view of a connecting portion of a metal tube containing optical fibers, and FIG. 3 is another embodiment of the second invention. FIG. 2 is an enlarged sectional view of a connecting portion of a metal tube containing an optical fiber. DESCRIPTION OF SYMBOLS 1... Optical fiber, 5... Covering tube, 6... Taper, 8... Connection part, 11, 14, 18-... Connection tube, l 2-... Taper, 16-... R , 21・
...Backing tube, S...Seal welding (part).
Claims (2)
された光ファイバ入り金属管どうしが金属製接続管を介
して接続された接続部において、被覆管端部外側および
接続管端部内側の少くとも一つに接続管の長手方向中央
に向かうに従い被覆管端部外径または接続管端部内径が
小さくなるテーパーまたはアールが形成されており、被
覆管外周面と接続管端との間がシール溶接されているこ
とを特徴とする光ファイバ入り金属管の接続部。(1) At the connection point where two optical fiber-containing metal tubes are connected via a metal connecting tube, where the optical fiber is inserted into the metal cladding tube with a gap, the outside of the cladding tube end and the inside of the connecting tube end are Both of the connecting tubes have a taper or radius in which the outer diameter of the cladding tube end or the inner diameter of the connecting tube end decreases toward the center in the longitudinal direction, creating a seal between the outer peripheral surface of the cladding tube and the connecting tube end. A connection part of a metal tube containing an optical fiber, characterized by being welded.
された光ファイバ入り金属管どうしが金属製接続管を介
して接続された接続部において、被覆管端部外側および
接続管端部内側の少くとも一つに接続管の長手方向中央
に向かうに従い被覆管端部外径または接続管端部内径が
小さくなるテーパーまたはアールが形成されており、被
覆管外周面と接続管端との間がシール溶接されており、
前記被覆管および接続管内に裏当て材が挿入されている
ことを特徴とする光ファイバ入り金属管の接続部。(2) At the connection point where two optical fiber-containing metal tubes are connected via a metal connecting tube, where the optical fiber is inserted into the metal cladding tube with a gap, the outside of the cladding tube end and the inside of the connecting tube end Both of the connecting tubes have a taper or radius in which the outer diameter of the cladding tube end or the inner diameter of the connecting tube end decreases toward the center in the longitudinal direction, creating a seal between the outer circumferential surface of the cladding tube and the connecting tube end. It is welded and
A connecting portion for a metal tube containing an optical fiber, characterized in that a backing material is inserted into the cladding tube and the connecting tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27567487A JPH01118809A (en) | 1987-11-02 | 1987-11-02 | Juncture of optical fiber-containing metallic tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27567487A JPH01118809A (en) | 1987-11-02 | 1987-11-02 | Juncture of optical fiber-containing metallic tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01118809A true JPH01118809A (en) | 1989-05-11 |
Family
ID=17558762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27567487A Pending JPH01118809A (en) | 1987-11-02 | 1987-11-02 | Juncture of optical fiber-containing metallic tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01118809A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5430818A (en) * | 1993-01-13 | 1995-07-04 | Deutsche Aerospace Ag | Protective cladding for a mono-mode directional coupler |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5188464A (en) * | 1975-02-03 | 1976-08-03 | ||
| JPS5550204A (en) * | 1978-10-03 | 1980-04-11 | Int Standard Electric Corp | Method of connecting optical fiberrmade communication cable * and plug therefor |
| JPS5689708A (en) * | 1979-12-24 | 1981-07-21 | Kokusai Denshin Denwa Co Ltd <Kdd> | Tail cable connecting method in light submarine repeater |
| JPS5732919B2 (en) * | 1976-12-29 | 1982-07-14 |
-
1987
- 1987-11-02 JP JP27567487A patent/JPH01118809A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5188464A (en) * | 1975-02-03 | 1976-08-03 | ||
| JPS5732919B2 (en) * | 1976-12-29 | 1982-07-14 | ||
| JPS5550204A (en) * | 1978-10-03 | 1980-04-11 | Int Standard Electric Corp | Method of connecting optical fiberrmade communication cable * and plug therefor |
| JPS5689708A (en) * | 1979-12-24 | 1981-07-21 | Kokusai Denshin Denwa Co Ltd <Kdd> | Tail cable connecting method in light submarine repeater |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5430818A (en) * | 1993-01-13 | 1995-07-04 | Deutsche Aerospace Ag | Protective cladding for a mono-mode directional coupler |
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