JP3495395B2 - Optical fiber drawing method - Google Patents
Optical fiber drawing methodInfo
- Publication number
- JP3495395B2 JP3495395B2 JP28922193A JP28922193A JP3495395B2 JP 3495395 B2 JP3495395 B2 JP 3495395B2 JP 28922193 A JP28922193 A JP 28922193A JP 28922193 A JP28922193 A JP 28922193A JP 3495395 B2 JP3495395 B2 JP 3495395B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- lower lid
- furnace
- drawing furnace
- lid
- 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 - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/0253—Controlling or regulating
Description
【０００１】[0001]
【産業上の利用分野】本発明は、光ファイバ母材を線引
炉にて加熱・溶融して光ファイバを線引きする際の線引
き開始時の線引き方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawing method at the start of drawing an optical fiber by heating and melting an optical fiber preform in a drawing furnace.
【０００２】[0002]
【従来技術】光ファイバの線引きは図２に示すような線
引き装置を用いて行われていた。すなわち、光ファイバ
母材１を線引炉２にて加熱溶融し、下方のキャプスタン
１２で引き取ることによって光ファイバ３とする。該光
ファイバ３は冷却装置４にて冷却されたのち外径測定器
５でその外径を測定され、続いて被覆樹脂塗布装置６お
よび被覆樹脂硬化装置７にて第１の被覆層を施され光フ
ァイバ素線８となる。同様にして該光ファイバ素線８は
被覆樹脂塗布装置９および被覆樹脂硬化装置１０にて第
２の被覆層を施され光ファイバ心線１１となる。光ファ
イバ心線１１はキャプスタン１２を経由して矢印方向の
図示しない巻取装置に巻き取られる。2. Description of the Related Art Drawing of an optical fiber has been performed by using a drawing device as shown in FIG. That is, the optical fiber preform 1 is heated and melted in the drawing furnace 2 and taken by the lower capstan 12 to form the optical fiber 3. The optical fiber 3 is cooled by a cooling device 4 and then its outer diameter is measured by an outer diameter measuring device 5, and then a first coating layer is applied by a coating resin coating device 6 and a coating resin curing device 7. It becomes the optical fiber strand 8. Similarly, the optical fiber element wire 8 is subjected to a second coating layer by the coating resin coating device 9 and the coating resin curing device 10 to become the optical fiber core wire 11. The optical fiber core wire 11 is taken up by a take-up device (not shown) in the arrow direction via the capstan 12.
【０００３】前記線引炉２は上部に上蓋２１および下部
に下蓋２２を具備している。該上蓋２１には、光ファイ
バ母材１を前記線引炉２中に供給するための母材供給口
２３があり、また前記下蓋２２には、線引きされた光フ
ァイバ３が引き出される光ファイバの通過口２４があ
る。さらに、線引炉２には、その上部および下部に線引
炉２内に繋がる上蓋２１および下蓋２２の炉心管側には
それぞれシールガス供給口２５および２６がある。この
シールガス供給口２５および２６から線引炉２内に不活
性ガス、たとえばＡｒガス、ＨｅガスやＮ2 ガスなどか
らなるシールガスを流すことによって線引炉２内の雰囲
気を清浄に保っている。The drawing furnace 2 has an upper lid 21 on the upper portion and a lower lid 22 on the lower portion. The upper lid 21 has a preform feed port 23 for feeding the optical fiber preform 1 into the drawing furnace 2, and the lower lid 22 has an optical fiber from which the drawn optical fiber 3 is drawn out. There is a passage opening 24. Further, in the drawing furnace 2, seal gas supply ports 25 and 26 are provided on the core tube side of the upper lid 21 and the lower lid 22 which are connected to the inside of the drawing furnace 2 at the upper and lower portions thereof, respectively. The atmosphere in the drawing furnace 2 is kept clean by flowing an inert gas such as Ar gas, He gas or N 2 gas into the drawing furnace 2 through the sealing gas supply ports 25 and 26. There is.
【０００４】線引き開始時、光ファイバ母材１が線引炉
２で加熱溶融されるとその先端に設けられた錘りの自重
による自然落下により光ファイバが引き出される。この
先端がキャプスタン１２に達したところで、光ファイバ
心線１１となった該先端はキャプスタン１２を経て図示
しない巻取装置にセットされる。このセットが終わるま
では、線引き後の光ファイバ３はその長手方向に垂直な
平面内における位置が固定せず、絶えず揺れている。そ
こで、線引炉２の光ファイバの通過口２４は、光ファイ
バの揺れが収束するまでは、ある程度大きくしておかな
ければならない。When the optical fiber preform 1 is heated and melted in the drawing furnace 2 at the start of drawing, the optical fiber is drawn out by the natural weight drop of the weight provided at the tip thereof. When this tip reaches the capstan 12, the tip, which has become the optical fiber core wire 11, passes through the capstan 12 and is set in a winding device (not shown). Until this setting is completed, the position of the optical fiber 3 after drawing is not fixed in the plane perpendicular to the longitudinal direction and is constantly swaying. Therefore, the optical fiber passage port 24 of the drawing furnace 2 must be made large to some extent until the sway of the optical fiber converges.
【０００５】しかしながら、前記通過口２４が大きく開
いていると、大気が線引炉２内に入りやすい。そこでこ
の時は大気が入らないように通常より多くの不活性ガス
を線引炉２内に流している。そして、光ファイバ３の揺
れが収束し、ほぼ固定されたら、光ファイバの通過口２
４を下蓋、例えばこの場合には半割の下蓋２２を閉じて
小さくし、線引炉２内に流す不活性ガスの量を減らして
線引きに適した値にする必要があった。However, if the passage port 24 is wide open, the atmosphere is likely to enter the drawing furnace 2. Therefore, at this time, a larger amount of inert gas than usual is flowed into the drawing furnace 2 so that the atmosphere does not enter. When the sway of the optical fiber 3 converges and is almost fixed, the optical fiber passage 2
It was necessary to close the lower lid 4, for example, the lower half lid 22 in this case, to make it smaller and reduce the amount of the inert gas flowing in the drawing furnace 2 to a value suitable for drawing.
【０００６】[0006]
【発明が解決しようとする課題】光ファイバ母材は、線
引炉内で加熱・溶融されてその先端が自由落下すること
によって線引きが開始される。該先端は、被覆樹脂塗布
装置、被覆樹脂硬化装置などを経てキャプスタンに達し
たのち、該キャプスタンにセットされて通常の光ファイ
バの線引き工程に入る。この定常状態の線引き工程に入
る前、すなわち線引き開始直後からしばらくの間の、特
に前記先端が巻取装置にセットされる前の光ファイバは
揺れていてその長手方向に垂直な平面内での位置が安定
しない。光ファイバの揺れが小さくなるのを待って直ち
に加熱炉の下蓋、例えば半割の下蓋を閉めることにより
光ファイバ通過口を小さくする。実際には作業者が目視
で該光ファイバの揺れを測定し、ある範囲内に光ファイ
バの揺れが収束したところで線引炉の下蓋を移動、具体
的には閉めて光ファイバ通過口を小さくし、さらに線引
炉内に流す不活性ガスの量を調節していた。そのため、
作業者によっては、測定値がばらついたりすることがあ
った。また、下蓋を閉め忘れたり、作業の順序が違って
しまって線引炉内に外気が入ってしまうことがあった。
その結果、製造された光ファイバ心線には多くの不良部
分が見つかることがあった。The optical fiber preform is heated and melted in the drawing furnace, and the free end of the tip thereof starts the drawing. The tip reaches a capstan through a coating resin coating device, a coating resin curing device, etc., and is then set on the capstan to start a normal optical fiber drawing process. Before entering this steady-state drawing step, that is, immediately after the start of drawing, for a while, especially before the tip is set in the winding device, the optical fiber is swaying and its position in the plane perpendicular to its longitudinal direction is swayed. Is not stable. Immediately after the fluctuation of the optical fiber becomes small, the lower lid of the heating furnace, for example, the lower lid of the half is closed to reduce the optical fiber passage opening. Actually, the operator visually measures the optical fiber shake, and when the optical fiber shake converges within a certain range, the lower lid of the drawing furnace is moved, specifically closed to reduce the optical fiber passage opening. In addition, the amount of inert gas flowing in the drawing furnace was adjusted. for that reason,
Depending on the operator, the measured value may fluctuate. Also, there were cases in which the lower lid was forgotten to be closed, or the order of the work was wrong, and outside air entered the drawing furnace.
As a result, many defects may be found in the manufactured optical fiber core wire.
【０００７】さらに、作業者は線引装置の最下部で、落
下をしてきた線引端をキャプスタンなどにかける作業も
しなければならない。そのため最初に線引き装置に光フ
ァイバ母材をセットしたのち、作業者は最下部へ移動し
て光ファイバの先端をキャプスタンや巻取装置にセット
し、再び最上部の線引炉の部分へ戻って加熱炉の下蓋を
閉めなくてはならなかった。そのため、作業者は線引装
置の最上部から最下部までを短時間のうちに移動しなけ
ればならず、その負担は非常に大きかった。Further, the worker must also work at the lowermost part of the drawing device to apply the falling drawing end to a capstan or the like. Therefore, after first setting the optical fiber preform in the drawing device, the worker moves to the bottom and sets the tip of the optical fiber in the capstan or winding device, and then returns to the uppermost drawing furnace part again. I had to close the bottom lid of the heating furnace. Therefore, the operator has to move from the uppermost part to the lowermost part of the drawing device in a short time, which is a heavy burden.
【０００８】そこで、線引炉の下蓋を閉じる作業を自動
化して作業性をよくし、かつ製造された光ファイバ心線
の品質がよい光ファイバの線引方法を開発することが緊
急の課題とされていた。Therefore, it is an urgent task to develop a method for drawing an optical fiber which automates the work of closing the lower lid of the drawing furnace to improve workability and which produces a good quality optical fiber core wire. Was said.
【０００９】[0009]
【課題を解決するための手段】本発明は、作業性がよく
て作業者の負担が少なく、かつ製造された光ファイバ心
線の品質がよい光ファイバの線引き方法を提供すること
を目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for drawing an optical fiber which has good workability, less burden on the operator, and good quality of the manufactured optical fiber core wire. .
【００１０】本発明の第１の構成は、光ファイバ母材を
シールガスを流している線引炉内で加熱・溶融し、下方
のキャプスタンで引き取ることによって光ファイバを線
引きする方法において、前記線引炉の下面に設けた下蓋
部分を通過した光ファイバの位置を検出し、該光ファイ
バが前記下蓋を閉めたときにその中央に位置する光ファ
イバ通過口に触れないことを検知したのち、前記下蓋を
自動的に閉めることを特徴とする。A first structure of the present invention is a method for drawing an optical fiber by heating and melting an optical fiber preform in a drawing furnace in which a sealing gas is flowing, and then drawing the optical fiber by a capstan below. The position of the optical fiber that passed through the lower lid portion provided on the lower surface of the drawing furnace was detected, and it was detected that the optical fiber did not touch the optical fiber passage opening located in the center when the lower lid was closed. After that, the lower lid is automatically closed.
【００１１】[0011]
【作用】線引炉の下蓋部分を通過した光ファイバのその
長手方向に対する垂直面内における位置を検出すれば容
易にその揺れの状況を測定することができる。さらに、
その測定値がある値を示したのち、下蓋を閉めるように
設定すれば、光ファイバが下蓋に触れて断線してしまう
などの問題が生じることなく、光ファイバ母材から光フ
ァイバを線引きすることができる。すなわち、光ファイ
バの線引き時における線引炉の下蓋を閉じる操作を自動
化することが可能となり、線引きを開始したら作業者が
付いていなくともよい。The swaying condition can be easily measured by detecting the position of the optical fiber passing through the lower lid portion of the drawing furnace in the plane perpendicular to its longitudinal direction. further,
If the lower lid is set to close after the measured value shows a certain value, the optical fiber can be drawn from the optical fiber preform without causing problems such as the optical fiber touching the lower lid and breaking. can do. That is, it becomes possible to automate the operation of closing the lower lid of the drawing furnace during the drawing of the optical fiber, and it is not necessary to have an operator after starting the drawing.
【００１２】[0012]
【実施例】以下、本発明の実施例を図面を参照して詳細
に説明する。実施例１としては、図１に示すような光フ
ァイバの線引き装置を用いて光ファイバの線引きから光
ファイバ心線の製造までをおこなった。すなわち、光フ
ァイバ母材１を線引炉２にて加熱溶融し、下方のキャプ
スタン１２で引き取ることによって光ファイバ３とす
る。該光ファイバ３は冷却装置４にて冷却されたのち外
径測定器５でその外径を測定されることに続いて被覆樹
脂塗布装置６および被覆樹脂硬化装置７にて第１の被覆
層を施され光ファイバ素線８となる。同様にして該光フ
ァイバ素線８には被覆樹脂塗布装置９および被覆樹脂硬
化装置１０にて第２の被覆層を施され光ファイバ心線１
１となる。光ファイバ心線１１はキャプスタン１２を経
由して図示しない巻取装置に巻き取られる。Embodiments of the present invention will now be described in detail with reference to the drawings. In Example 1, an optical fiber drawing apparatus as shown in FIG. 1 was used to perform drawing of an optical fiber to manufacture of an optical fiber core wire. That is, the optical fiber preform 1 is heated and melted in the drawing furnace 2 and taken by the lower capstan 12 to form the optical fiber 3. The optical fiber 3 is cooled by a cooling device 4, and then its outer diameter is measured by an outer diameter measuring device 5. Then, a first coating layer is formed by a coating resin coating device 6 and a coating resin curing device 7. The optical fiber strand 8 is applied. Similarly, a second coating layer is applied to the optical fiber element wire 8 by a coating resin coating device 9 and a coating resin curing device 10, and the optical fiber core wire 1
It becomes 1. The optical fiber core wire 11 is wound up by a winding device (not shown) via the capstan 12.
【００１３】前記線引炉２は上部に上蓋２１および下部
に下蓋、具体的には半割の下蓋２２を具備している。該
上蓋２１には、光ファイバ母材１を前記線引炉２中に供
給するための母材供給口２３があり、また前記下蓋２２
には、線引きされた光ファイバ３が引き出される光ファ
イバの通過口２４がある。さらに、上蓋２１および下蓋
２２の炉心管側にはそれぞれシールガス供給口２５およ
び２６がある。このシールガス供給口２５および２６か
ら線引炉２内に不活性ガス、例えばＡｒガス、Ｈｅガス
やＮ2 ガスなどからなるシールガスを流すことによって
線引炉２内の雰囲気を清浄に保っている。なお、符号２
７は、線引きされた光ファイバがその長手方向に垂直な
平面内でどの程度揺れているのかを測定するための位置
検出器であり、Ｘ軸、Ｙ軸の位置を検出するための装置
である。The drawing furnace 2 is provided with an upper lid 21 on the upper part and a lower lid on the lower part, specifically, a lower half lid 22. The upper lid 21 has a preform feeding port 23 for feeding the optical fiber preform 1 into the drawing furnace 2, and the lower lid 22.
Has an optical fiber passage opening 24 through which the drawn optical fiber 3 is drawn out. Further, seal gas supply ports 25 and 26 are provided on the core tube side of the upper lid 21 and the lower lid 22, respectively. The atmosphere in the drawing furnace 2 is kept clean by flowing a sealing gas such as an inert gas such as Ar gas, He gas or N 2 gas from the sealing gas supply ports 25 and 26 into the drawing furnace 2. There is. Note that reference numeral 2
Reference numeral 7 is a position detector for measuring how much the drawn optical fiber is swaying in a plane perpendicular to its longitudinal direction, and is a device for detecting the positions of the X axis and the Y axis. .
【００１４】この線引装置を用いて常法にて光ファイバ
の線引きから光ファイバ心線の製造までをおこなった。
ただし、光ファイバの線引きを開始した直後には、その
揺れを位置検出器で測定し、所定の範囲内に光ファイバ
が収束したことを確認したのち、線引炉２の下蓋２２を
移動して光ファイバ通過口２４を小さくした。その結
果、線引き開始後５分〜１０分で光ファイバの揺れは収
束し、通常の光ファイバの線引き工程に入ることができ
た。また、光ファイバ心線を製造したのちその品質につ
いて様々な試験をおこなったが、特に問題は生じなかっ
た。Using this drawing apparatus, the drawing of the optical fiber and the production of the optical fiber core wire were carried out in the usual manner.
However, immediately after the drawing of the optical fiber is started, the shake is measured by a position detector, and after confirming that the optical fiber has converged within a predetermined range, the lower lid 22 of the drawing furnace 2 is moved. The optical fiber passage port 24 was made smaller. As a result, the sway of the optical fiber converged within 5 to 10 minutes after the start of the drawing, and the normal optical fiber drawing process could be started. Further, after manufacturing the optical fiber core wire, various tests were conducted for its quality, but no particular problems occurred.
【００１５】実施例２として、上述した実施例１と同様
にして光ファイバ心線を製造した。但し、実施例２で
は、下蓋を閉めたのちに不活性ガス、例えばＡｒガス、
ＨｅガスやＮ2 ガスなどからなるシールガスの流量を所
定の量に変化させるまで自動的におこなった。実施例２
で製造した光ファイバ心線の品質について、実施例１と
同様に様々な試験をおこなったが、特に問題は生じなか
った。As Example 2, an optical fiber core wire was manufactured in the same manner as in Example 1 described above. However, in Example 2, after closing the lower lid, an inert gas such as Ar gas,
It was automatically performed until the flow rate of the seal gas such as He gas or N 2 gas was changed to a predetermined amount. Example 2
Various tests were performed on the quality of the optical fiber core wire manufactured in the same manner as in Example 1, but no particular problem occurred.
【００１６】[0016]
【発明の効果】本発明によれば、容易に線引き開始直後
の光ファイバの揺れの状態を把握することができ、さら
に無人で線引炉の下蓋を閉じてもその光ファイバが下蓋
中央の光ファイバ通過口に触れることなく線引きされる
光ファイバの線引き装置が提供される。According to the present invention, it is possible to easily grasp the state of swaying of an optical fiber immediately after the start of drawing, and even if the lower lid of the drawing furnace is closed unmanned, the optical fiber will be centered on the lower lid. There is provided an optical fiber drawing device for drawing an optical fiber without touching the optical fiber passage opening.
【図１】図１は、本発明に関わる光ファイバの線引き装
置の一実施例である。FIG. 1 is an embodiment of an optical fiber drawing apparatus according to the present invention.
【図２】図２は、従来の光ファイバの線引き装置であ
る。FIG. 2 is a drawing apparatus of a conventional optical fiber.
１…光ファイバ母材 ２…線引炉 ３…光ファイバ ４…冷却装置 ５…外径測定器 ６…被覆樹脂塗布装置 ７…被覆樹脂硬化装置 ８…光ファイバ素線 ９…被覆樹脂塗布装置 １０…被覆樹脂硬化装置 １１…光ファイバ心線 １２…キャプスタン ２１…上蓋 ２２…下蓋 ２３…母材供給口 ２４…光ファイバ通過口 ２５…上部シールガス供給口 ２６…下部シールガス供給口 ２７…位置検出器 1 ... Optical fiber preform 2 ... Drawing furnace 3 ... Optical fiber 4 ... Cooling device 5 ... Outer diameter measuring instrument 6 ... Coating resin coating device 7 ... Coating resin curing device 8 ... Optical fiber strand 9 ... Coating resin coating device 10 ... Coating resin curing device 11 ... Optical fiber core wire 12 ... Capstan 21 ... Top lid 22 ... Lower lid 23 ... Base material supply port 24 ... Optical fiber passage port 25 ... Upper seal gas supply port 26 ... Lower seal gas supply port 27 ... Position detector
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−51439（ＪＰ，Ａ) 特開 平２−92838（ＪＰ，Ａ) 実開 平２−61940（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) C03B 37/00 - 37/16 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Laid-Open No. 2-51439 (JP, A) Japanese Patent Laid-Open No. 2-92838 (JP, A) Actually Laid-Open No. 2-61940 (JP, U) (58) Field (Int.Cl. 7 , DB name) C03B 37/00-37/16
Claims (2)
この錘りの落下により光ファイバを引き出し、しかる後
光ファイバ母材をシールガスを流している線引炉内で加
熱・溶融しながら、下方のキャプスタンで引き取ること
によって光ファイバを線引きする方法において、錘りに
より引き出された光ファイバの位置を前記線引炉の下方
に設けた位置検出器により検出し、該光ファイバが前記
線引炉の下部に設けられている下蓋を閉めたときにその
下蓋の中央に位置する光ファイバ通過口に触れないこと
を検知したのち、前記下蓋を自動的に閉めることを特徴
とする光ファイバの線引き方法。1. A weight is attached to the tip of an optical fiber preform,
In the method of drawing the optical fiber by this drop of the weight, and then heating and melting the optical fiber base material in the drawing furnace in which the sealing gas is flowing, while drawing it with the capstan below, The position of the optical fiber pulled out by the weight is detected by a position detector provided below the drawing furnace, and the optical fiber is closed when the lower lid provided at the bottom of the drawing furnace is closed. A method for drawing an optical fiber, which comprises automatically closing the lower lid after detecting that it does not touch an optical fiber passage opening located at the center of the lower lid.
内に流すガス量を自動的に変更することを特徴とする請
求項１記載の光ファイバの線引き方法。2. The method for drawing an optical fiber according to claim 1, wherein the amount of gas flowing into the heating furnace is automatically changed after automatically closing the lower lid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28922193A JP3495395B2 (en) | 1993-11-18 | 1993-11-18 | Optical fiber drawing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28922193A JP3495395B2 (en) | 1993-11-18 | 1993-11-18 | Optical fiber drawing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07144930A JPH07144930A (en) | 1995-06-06 |
| JP3495395B2 true JP3495395B2 (en) | 2004-02-09 |
Family
ID=17740359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28922193A Expired - Lifetime JP3495395B2 (en) | 1993-11-18 | 1993-11-18 | Optical fiber drawing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3495395B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6244872B2 (en) * | 2013-12-13 | 2017-12-13 | 住友電気工業株式会社 | Optical fiber manufacturing method |
-
1993
- 1993-11-18 JP JP28922193A patent/JP3495395B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07144930A (en) | 1995-06-06 |
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