JP3151387B2 - Manufacturing method of optical fiber preform - Google Patents

Manufacturing method of optical fiber preform

Info

Publication number
JP3151387B2
JP3151387B2 JP17973395A JP17973395A JP3151387B2 JP 3151387 B2 JP3151387 B2 JP 3151387B2 JP 17973395 A JP17973395 A JP 17973395A JP 17973395 A JP17973395 A JP 17973395A JP 3151387 B2 JP3151387 B2 JP 3151387B2
Authority
JP
Japan
Prior art keywords
base material
ingot
preform
stretching
material ingot
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
Application number
JP17973395A
Other languages
Japanese (ja)
Other versions
JPH0930827A (en
Inventor
一宏 濱口
正美 寺嶋
秀夫 平沢
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shin Etsu Chemical Co Ltd
Original Assignee
Shin Etsu Chemical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shin Etsu Chemical Co Ltd filed Critical Shin Etsu Chemical Co Ltd
Priority to JP17973395A priority Critical patent/JP3151387B2/en
Publication of JPH0930827A publication Critical patent/JPH0930827A/en
Application granted granted Critical
Publication of JP3151387B2 publication Critical patent/JP3151387B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
    • C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
    • C03B37/0124—Means for reducing the diameter of rods or tubes by drawing, e.g. for preform draw-down
    • 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
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/01466—Means for changing or stabilising the diameter or form of tubes or rods
    • 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
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/01486—Means for supporting, rotating or translating the preforms being formed, e.g. lathes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は光ファイバ母材の製
造方法、特には光ファイバ母材インゴットをこれより小
径の母材ロッドに延伸する工程において、延伸後の光フ
ァイバ母材ロッドの曲がりを低減化する光ファイバ母材
の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an optical fiber preform, and more particularly, to a step of stretching an optical fiber preform ingot into a preform rod having a smaller diameter than the optical fiber preform rod. The present invention relates to a method for manufacturing an optical fiber preform to be reduced.

【０００２】[0002]

【従来の技術】母材インゴットをこれより小径の母材ロ
ッドに延伸して光ファイバ母材を製造する方法について
は、従来から光ファイバ母材インゴットを酸水素火炎や
電気炉で加熱し、軟化させながら加熱溶融部の外径を外
径測定器などで測定し、その測定値に基づいて引取り速
度を制御するという方法がとられている。しかし、この
場合、母材インゴットの両端には母材インゴット把持用
のダミー棒をガラス旋盤などを用いて溶着し、この把持
用ダミー棒を把持することによって母材インゴットを延
伸装置にセットするのであるが、把持用ダミー棒の溶着
作業は、作業者がガラス旋盤を用いて母材インゴットと
ダミー棒の軸中心を目視して調整しながら行なっている
ために、溶着時のダミー棒の芯出し精度は作業者個人の
技能によることになり、芯出し精度にばらつきが生じ易
いという問題点がある。2. Description of the Related Art A method of manufacturing an optical fiber preform by drawing a preform ingot into a preform rod having a smaller diameter than the conventional method is to heat an optical fiber preform ingot with an oxyhydrogen flame or an electric furnace to soften the preform. A method has been adopted in which the outer diameter of the heated and melted portion is measured with an outer diameter measuring device or the like, and the take-up speed is controlled based on the measured value. However, in this case, a dummy bar for holding the base material ingot is welded to both ends of the base material ingot using a glass lathe or the like, and the base material ingot is set in the stretching device by holding the dummy bar for holding. However, since the welding work of the gripping dummy rod is performed while the operator visually adjusts the axis of the base metal ingot and the dummy rod using a glass lathe, the centering of the dummy rod during welding is performed. The accuracy depends on the skill of each worker, and there is a problem that the alignment accuracy tends to vary.

【０００３】また、母材インゴットの製造においては、
多孔質ガラス母材から透明ガラス化するときに収縮し、
この収縮の度合は円周方向でバラツキが生ずるので、透
明ガラス時には母材インゴットが曲がってしまうことが
ある。このように曲がってしまった母材インゴットをよ
り小径の母材ロッドに延伸するために延伸装置にセット
すると、母材インゴットが延伸装置の中心に位置せず、
この状態で昇温すると母材インゴットの周方向に温度分
布が生じ、この周方向の温度分布が母材インゴットを延
伸する際に粘度の差として現われるので、これが母材イ
ンゴットより製作される母材ロッドの曲がりの原因とな
る。[0003] In the production of a base material ingot ,
Shrink when transparent glass from porous glass base material,
Since the degree of this shrinkage varies in the circumferential direction, the base material ingot may be bent in the case of transparent glass. When the base material ingot that has been bent in this way is set in a stretching device to stretch it into a smaller diameter base material rod, the base material ingot is not located at the center of the stretching device,
When the temperature is increased in this state, a temperature distribution is generated in the circumferential direction of the base material ingot, and this circumferential temperature distribution appears as a difference in viscosity when the base material ingot is stretched. This may cause bending of the rod.

【０００４】[0004]

【発明が解決しようとする課題】このように母材ロッド
に曲がりが一旦発生すると、延伸装置の吊り下げ機構お
よび引き取り機構の中心軸が精度よく一致している場合
でも、延伸中にその曲がりが解消されることは少なく、
延伸の最後まで一旦生じた曲がりの影響が及んでしまい
がちである。このため、母材ロッドの引取り開始側の部
分に曲がりが生じてしまうと、その曲がりが次の曲がり
を誘発させ易く、次々に曲がりを生ずる可能性があり、
母材ロッド全長にわたって曲がりが生じてしまうことと
なる。Once the base material rod bends in this way, even if the center axes of the suspending mechanism and the take-off mechanism of the stretching device coincide with each other with high accuracy, the bending during the stretching is performed. It is rarely canceled,
The effect of the bending once generated until the end of stretching tends to be exerted . Therefore, when bending to take back the start-side portion of the preform rod is caused, the bend tends to induce bending of the following, may result in turn one after another,
The bending occurs over the entire length of the base material rod.

【０００５】このように母材インゴットより延伸された
曲がりの生じた母材ロッドは、光ファイバに線引き時に
おける作業性ならびにファイバ特性の安定性を大きく損
うので、この曲がりの生じた母材ロッドは光ファイバに
線引きするに当って、予めこの曲がりを修正するという
工程が必要であるが、これは作業効率を大きく低下させ
るという不利がある。従って、生産性向上のためには母
材インゴット把持用のダミー棒が偏心したり、母材イン
ゴット自身に曲がりが生じている場合でも、母材ロッド
に曲がりを生じないように延伸する方法の提供が求めら
れている。[0005] The bent preform rod stretched from the preform ingot greatly impairs the workability and the stability of the fiber characteristics during the drawing of the optical fiber, so that the bent preform rod is bent. the hitting to drawing the optical fiber, previously it is necessary step of modifying the curvature, which may disadvantage greatly reduces the working efficiency. Therefore, in order to improve productivity, even if the dummy bar for holding the base material ingot is eccentric or the base material ingot itself is bent, the base material rod is stretched so as not to be bent. There is a need to provide a way to do this.

【０００６】[0006]

【課題を解決するための手段】本発明はこのような不
利、問題点を解決した光ファイバ母材の製造方法に関す
るものであり、これは母材インゴットをこれより小径の
母材ロッドに延伸して光ファイバ母材を製造する方法に
おいて、母材インゴットを延伸装置にセットした状態に
て母材インゴットの中心と延伸装置の軸中心とのずれ量
を、延伸装置のヒーターより上部の母材インゴットの延
伸されていない位置にて測定し、母材インゴットの上側
把持部を水平方向に移動させることにより、母材インゴ
ットの中心が延伸装置の軸中心と一致するよう母材イン
ゴットの位置を移動させることを特徴とするものであ
る。SUMMARY OF THE INVENTION The present invention is directed to a method of manufacturing an optical fiber preform which solves such disadvantages and problems, by extending a preform ingot into a preform rod having a smaller diameter. In the method of manufacturing an optical fiber preform, the amount of deviation between the center of the preform ingot and the axial center of the drawing device in a state where the preform ingot is set in the drawing device is adjusted to the preform ingot above the heater of the drawing device. No
Measure at the unstretched position and above the base metal ingot
By moving the gripping portion in the horizontal direction, the position of the base material ingot is moved so that the center of the base material ingot coincides with the axis center of the stretching device.

【０００７】本発明による光ファイバ母材の製造方法
は、上記したように曲がりをもつ母材インゴットを延伸
装置にセットし、母材インゴットの中心と延伸装置の軸
中心とのずれ量を測定し、このずれ量に基づいて母材イ
ンゴットの中心が延伸装置の軸中心と一致するように母
材インゴットの位置を移動させるものである。すなわ
ち、母材インゴットの把持用ダミー棒の位置に芯ずれが
ある場合や母材インゴットに曲がりがある場合に、母材
インゴットをそのまま延伸装置にセットすると母材イン
ゴットの中心と延伸装置の軸中心が一致しないので、こ
れについては、まず母材インゴットの軸中心と延伸装置
の軸中心との位置のずれ量および母材インゴットの傾き
を位置測定手段で測定する。[0007] the production method of the present invention by an optical fiber preform, the preform ingot having a bend as described above was set in the stretching device, to measure the amount of deviation between the axis centers of the stretching device of the preform ingot The position of the base material ingot is moved so that the center of the base material ingot coincides with the center of the axis of the stretching device based on the shift amount. In other words, when there is a misalignment in the position of the dummy bar for gripping the base material ingot or when the base material ingot is bent, if the base material ingot is set as it is in the stretching device, the center of the base material ingot and the axial center of the stretching device Since these do not coincide with each other , first of all, the amount of displacement between the axis center of the base material ingot and the axis center of the stretching device and the inclination of the base material ingot are measured by position measuring means.

【０００８】ついで、この位置ずれ量に応じて母材イン
ゴットの把持機構を水平方向に移動することにより、母
材インゴットの軸中心と延伸装置の軸中心とを一致さ
せ、この状態で昇温し、所定時間経過後に延伸を開始す
ればよい。延伸時の外径制御については従来と同じよう
に延伸中のテーパー部の外径を測定して、その外径が一
定値になるように制御すればよい。しかし、これについ
ては延伸開始後においても、一定時間間隔で母材インゴ
ットと延伸装置との横ずれ量の測定、およびこれに基づ
く位置調整を繰返し実施すれば、母材ロッド全長にわた
って母材インゴットの軸中心と延伸装置の軸中心を一致
させつつ延伸をすることができる。Then, by moving the holding mechanism of the base material ingot in the horizontal direction in accordance with the amount of the displacement, the center of the base material ingot and the center of the stretching device are made to coincide with each other. After the elapse of a predetermined time, stretching may be started . Regarding the outer diameter control at the time of stretching, the outer diameter of the tapered portion during the stretching may be measured and the outer diameter may be controlled to a constant value as in the conventional case. However, even after the start of stretching, if the measurement of the amount of lateral displacement between the base material ingot and the stretching device and the position adjustment based on the measurement are repeatedly performed at regular time intervals, the shaft of the base material ingot can be extended over the entire length of the base material rod. The stretching can be performed while the center and the axial center of the stretching device are aligned.

【０００９】また、母材インゴットの軸中心と延伸装置
の軸中心がずれた場合には、母材インゴットの周方向の
位置によって、母材インゴットと加熱熱源であるヒータ
ーとの距離に差が生じ、母材インゴットの温度に差が生
じて母材インゴットの粘度に差が生じ、母材ロッドに曲
がりが生じるおそれがあるが、これについては、母材イ
ンゴットの周方向を均一に加熱して母材インゴットと延
伸装置、特に加熱熱源であるヒーターとの軸ずれを抑え
れば、この母材インゴットの粘度差による曲がりの発生
を抑えることができる。さらにこの方法においては、延
伸中に母材インゴットの移動につれて繰返し母材インゴ
ットの位置調整と調芯が行なわれ、母材インゴットは常
に延伸装置の中心に位置するので、これは母材インゴッ
トの一部のみに曲がりがあるような場合にも対応できる
ことになる。When the center of the base material ingot is shifted from the center of the drawing device, the distance between the base material ingot and the heater serving as a heat source depends on the circumferential position of the base material ingot. a difference occurs, the difference occurs between the temperature of the base material ingot occurs a difference in viscosity of the base material ingot, there is a fear that bending occurs in the base material rod, which will, uniform in the circumferential direction of the base material ingot If heating is performed to suppress the axis deviation between the base material ingot and the stretching device, particularly the heater that is a heating heat source, it is possible to suppress the occurrence of bending due to the difference in viscosity of the base material ingot. Further, in this method, the position adjustment and alignment of the base material ingot are repeatedly performed as the base material ingot moves during the drawing, and the base material ingot is always located at the center of the drawing device. It is possible to cope with a case where only the section has a bend.

【００１０】[0010]

【発明の実施の形態】つぎに本発明の実施の形態を実施
例、比較例をあげて説明する。 実施例１ 図１に示したように、外径 120mm、有効部長 800mmの透
明ガラス化時に曲がりの発生した母材インゴット１の上
下に把持用ダミー棒３を溶着し、その母材インゴットの
上側を把持用ダミー棒３でＸＹステージ６に取りつけた
吊り下げ用チャック５に吊り下げ、これを加熱ヒーター
７で加熱し、これを延伸引取り用チャック９で引き下げ
て、これより径の小さい母材ロッド２を作るようにし
た。Next, embodiments of the present invention will be described with reference to examples and comparative examples. Example 1 As shown in FIG. 1, a holding dummy bar 3 was welded to the upper and lower sides of a bent base metal ingot 1 having a diameter of 120 mm and an effective part length of 800 mm, which was bent during the vitrification, and the upper side of the base metal ingot was placed. The dummy rod 3 is held by a hanging chuck 5 attached to an XY stage 6, heated by a heater 7, pulled down by a stretching / pulling chuck 9, and formed into a base material rod having a smaller diameter. 2 was made.

【００１１】この場合、母材インゴットが曲がりの発生
したものであることから、この母材インゴット１に対す
る下側把持用ダミー棒の溶着は図２に示したように母材
インゴット１の軸中心に対して５mmずれた状態で溶着さ
せた。また、これについてはこの母材インゴット１を延
伸炉４内にセットした状態で、位置測定器11によって母
材インゴット１と延伸装置の軸中心のずれ量を測定した
ところ、図３に示したようにこれが４mmであることが確
認されたので、これについては、母材インゴット１の吊
り下げ側の吊り下げ用チャックを移動させて調芯したの
ち、昇温して延伸を開始した。In this case, since the base material ingot is bent, the welding of the lower gripping dummy bar to the base material ingot 1 is performed at the center of the base material ingot 1 as shown in FIG. The welding was performed with a deviation of 5 mm. In addition, when the base material ingot 1 was set in the drawing furnace 4 and the displacement between the base material ingot 1 and the axial center of the drawing device was measured by the position measuring device 11, as shown in FIG. since this has been confirmed to be 4mm in, for this, after hanging side hanging chuck to move the in alignment for placing of the preform ingot 1 began drawing temperature was raised.

【００１２】延伸中の外径制御は従来と同じように、延
伸中のテーパー部の外径を外径測定器10で測定し、その
外径が一定となるように引き取り速度を制御したが、こ
の実施例では母材ロッド２の最終外径が40mmになるよう
に引き取り速度を制御した。なお、延伸を開始したのち
は、母材インゴットと延伸装置との軸ずれ量を１分ごと
に測定し、これに基づいて母材インゴットを調芯しなが
ら延伸を行なったが、この方法で延伸を行なった母材ロ
ッドを１ｍずつ切り分けて、図５に示した曲がり量測定
器で曲がり量を下記により測定したところ、後記する表
１に示したように、母材ロッドの各分割における曲がり
量は0.65mm未満と十分に小さいものになった。 曲がり量の測定方法 母材ロッド２を図５のように台13上に置き、その上にダ
イアルゲージを設置して、母材ロッドを長手軸を中心に
一回転させたときのダイアルゲージの目盛の値を場所を
変えて求め、その振れ幅の最大の値をもって曲がり量
（mm）とした。As for the control of the outer diameter during the stretching, the outer diameter of the tapered portion during the stretching is measured by the outer diameter measuring device 10 and the take-off speed is controlled so that the outer diameter is constant, as in the conventional case. In this embodiment, the take-up speed was controlled so that the final outer diameter of the base material rod 2 became 40 mm. After the stretching was started, the amount of axial misalignment between the base material ingot and the stretching device was measured every minute, and the base material ingot was stretched while being centered on the basis of this. the isolate the preform rod was conducted by 1 m, was measured bending amount by the following in the indicated amount of flexure measuring apparatus 5, as shown in Table 1 below, the bending amount in each division of the preform rod Became sufficiently small at less than 0.65 mm. Method of measuring the amount of bending The base material rod 2 is placed on a table 13 as shown in FIG. 5, a dial gauge is set on the base material, and the dial gauge is scaled when the base material rod is rotated once around its longitudinal axis. of the value obtained by changing the location, it was the swing maximum of the amount of bending with the value of the width (mm).

【００１３】実施例２ 実施例１の方法において、透明ガラス化時に曲がりの発
生した母材インゴットに把持用ダミー棒を溶着接続する
ときに、図４に示したように、母材インゴットの両端面
の中心の上下に把持用ダミー棒が一直線に配置されるよ
うに溶着接続した。また、この母材インゴット自身の曲
がり量を図５に示した曲がり測定器で上記により測定し
たところ、2.9mmで母材インゴットとしてはかなりの大
きな曲がり量であることが認められたが、この母材イン
ゴット１を延伸炉４内にセットした状態で位置測定器11
で母材インゴットの延伸装置の軸中心とのずれ量を測定
したところ、1.0mmと測定された。[0013] In the method of Example 1, when the welding connecting the gripping dummy rod generated preform ingot bend during the vitrification, as shown in FIG. 4, both end surfaces of the base material ingot Were welded and connected such that the holding dummy bars were arranged in a straight line above and below the center. Further, when the bending amount of the base material ingot itself was measured by the bending measuring device shown in FIG. 5 as described above, it was recognized that the base material ingot was 2.9 mm, which was a considerably large bending amount. With the material ingot 1 set in the drawing furnace 4, the position measuring device 11
When the amount of deviation of the base material ingot from the axis center of the stretching device was measured, the measured value was 1.0 mm.

【００１４】ついでこのずれ量に基づいて、母材インゴ
ット１の吊り下げ用チャック５を移動させて調芯したの
ち、昇温して延伸を開始させ、延伸中における外径制御
は実施例１と同じく従来通りとし、母材ロッドの最終外
径が40mmになるように引き取る速度を制御した。また、
延伸を開始してからは、母材インゴットと延伸装置との
軸ずれ量を１分ごとに測定し、この測定結果に基づいて
母材インゴットを調芯しながら延伸を行なったが、この
方法で延伸した母材ロッドを１ｍずつ切り分けて、その
曲がり量を図５に示した曲がり量測定器で測定したとこ
ろ、後記する表２に示したように、母材ロッドの各分割
における曲がり量は 0.6mm未満と十分に小さくなってい
た。[0014] Then, based on this displacement amount, after the chuck 5 for hanging the base material ingot 1 was moved was in alignment, warmed to initiate the stretching, the outside diameter control during stretching as in Example 1 Similarly, the pulling speed was controlled so that the final outer diameter of the base material rod was 40 mm. Also,
After the stretching was started, the amount of axial misalignment between the base material ingot and the stretching device was measured every minute, and the base material ingot was stretched while being centered based on the measurement result. the stretched preform rod isolate by 1 m, was measured and the curve amount at the indicated curve amount measuring apparatus 5, as shown in Table 2 to be described later, the bending amount in each division of the preform rod 0.6 It was small enough to be less than mm.

【００１５】比較例１ 実施例１において、母材インゴット１を延伸炉４内にセ
ットした状態で、位置測定器11で母材インゴットと延伸
装置の軸中心のずれ量を測定したところ、４mmのずれ量
が見いだされたが、この比較例ではこの状態での母材イ
ンゴットの軸中心を合わさず、このずれを残したままで
昇温し、延伸を開始したが、延伸中における外径制御は
従来通りとし、実施例１と同じく母材ロッドの最終外径
が40mmになるように引き取り速度を制御した。Comparative Example 1 In Example 1, while the base material ingot 1 was set in the drawing furnace 4, the amount of displacement between the base material ingot and the axial center of the drawing device was measured by the position measuring device 11. Although the amount of deviation was found, in this comparative example, the axis center of the base material ingot in this state was not aligned, and the temperature was raised while leaving this deviation, and stretching was started. And the final outer diameter of the base material rod as in Example 1.
The take-up speed was controlled so as to be 40 mm.

【００１６】この方法で得られた母材ロッドを１ｍずつ
切り分けて、図５に示した曲がり測定器で上記により曲
がり量を測定したところ、これは後記する表１に示した
ように、母材ロッドの各分割における曲がり量は 1.2〜
1.6mmと下側保持用ダミー棒のずれのために延伸開始側
において特に大きくなっており、また延伸開始側に生じ
た曲がりのために延伸の終盤まで曲がりが引続いて発生
していることが判った。The base material rod obtained by this method was cut into 1 m sections, and the amount of bending was measured by the bending measuring device shown in FIG. 5 as described above. The bending amount in each division of the rod is 1.2 ~
1.6mm, which is particularly large at the stretching start side due to the displacement of the lower holding dummy bar, and that bending continues to the end of stretching due to the bending that occurred at the stretching start side. understood.

【００１７】比較例２ 実施例２において、母材インゴットを延伸炉４内にセッ
トした状態で、位置測定器により母材インゴットと延伸
装置の軸ずれ量を測定したところ、 1.0mmのずれが見ら
れたが、本比較例ではこのずれた状態のまま昇温し、延
伸を開始したが、延伸中における外径制御は実施例１と
同じく従来通りとし、母材ロッドの最終外径が40mmにな
るように引き取り速度を制御した。Comparative Example 2 In Example 2, when the base material ingot was set in the drawing furnace 4 and the amount of axial deviation between the base material ingot and the drawing device was measured by a position measuring instrument, a deviation of 1.0 mm was found. However, in this comparative example, the temperature was raised in this deviated state and the stretching was started, but the outer diameter control during the stretching was the same as in Example 1, and the final outer diameter of the base rod was reduced to 40 mm. The take-up speed was controlled so that

【００１８】この方法で得られた母材ロッドを１ｍずつ
切り分けて、図５に示した曲がり測定器で曲がり量を上
記により測定したところ、これはつぎの表２に示したよ
うに、母材ロッドの各分割における曲がり量は 0.6〜1.
5mm と延伸開始側の一本分を除いて曲がりが大きくなっ
ている。これはインゴットの曲がりのために、延伸の進
行とともに母材インゴットの位置が延伸装置の軸中心と
ずれてきたためと考えられるが、延伸途中で発生した曲
がりは、それ以降の延伸部分にかなり影響を及ぼしてい
ることも判った。The base material rod obtained by this method was cut into 1 m sections, and the amount of bending was measured by the bending measuring instrument shown in FIG. 5 as described above. The bending amount in each division is 0.6 to 1.
The bend is large except for 5 mm, which is one for the stretching start side. This is due to the bending of the ingot, the position of the base material ingot is presumably because that has deviated from the axial center of the stretching device with the progress of stretching, bending occurs during stretching, considerably affect the extension portion of the subsequent It has also been found to have affected.

【００１９】[0019]

【表１】 [Table 1]

【００２０】[0020]

【表２】 [Table 2]

【００２１】[0021]

【発明の効果】本発明は光ファイバ母材の製造方法に関
するものであるが、本発明では母材インゴットに曲がり
がある場合でも、この曲がりにもとづく母材インゴット
の中心と延伸装置の軸中心のずれが、ヒーターより上部
の母材インゴットの延伸されていない位置で測定され、
母材インゴットの水平方向への移動により補正されるの
で、延伸後の母材ロッドの曲がりを小さくすることがで
きるという有利性が与えられる。The present invention relates to a method of manufacturing an optical fiber preform. In the present invention, even if the preform ingot has a bend, the center of the preform ingot based on the bend and the center of the axis of the drawing device are not affected. The gap is above the heater
Measured at the unstretched position of the base material ingot of
Since the correction is made by the movement of the base material ingot in the horizontal direction, there is provided an advantage that the bending of the base material rod after stretching can be reduced.

【図面の簡単な説明】[Brief description of the drawings]

【図１】 本発明による光ファイバ延伸装置の概略縦断
面図を示したものである。FIG. 1 is a schematic longitudinal sectional view of an optical fiber drawing apparatus according to the present invention.

【図２】 本発明の実施例１における下側把持用ダミー
棒がずれて溶着された母材インゴットの縦断面図を示し
たものである。FIG. 2 is a vertical cross-sectional view of a base material ingot in which a lower grip dummy bar according to the first embodiment of the present invention has been shifted and welded.

【図３】 本発明の実施例１における母材インゴットと
延伸装置とのずれ量を示した母材インゴットの縦断面図
を示したものである。FIG. 3 is a longitudinal sectional view of the base material ingot showing the amount of displacement between the base material ingot and the stretching device in Example 1 of the present invention.

【図４】 本発明の実施例２における曲がりの生じた母
材インゴットと把持用ダミー棒との取りつけ状態を示し
た母材インゴットの縦断面図を示したものである。[4] shows a longitudinal sectional view of a preform ingot showing a mounting state of the embodiment with the bending of the resulting base material ingot at 2 and gripping dummy bar of the present invention.

【図５】 従来公知の曲がり量測定器の縦断面図を示し
たものである。FIG. 5 is a longitudinal sectional view of a conventionally known bending amount measuring device.

【符号の説明】[Explanation of symbols]

１…母材インゴット ２…延伸後の母材ロッド ３…把持用ダミー棒 ４…延伸炉 ５…吊り下げ用チャック ６…ＸＹステージ ７…加熱用ヒーター ８…移動用モーター ９…延伸引取り用チャック 10…外径測定器 11…位置測定器 12…演算処理用C.P.U. 13…台 DESCRIPTION OF SYMBOLS 1 ... Base material ingot 2 ... Base material rod after extending | stretching 3 ... Dummy bar for gripping 4 ... Stretching furnace 5 ... Suspension chuck 6 ... XY stage 7 ... Heating heater 8 ... Moving motor 9 ... Stretching pulling chuck 10: Outer diameter measuring device 11: Position measuring device 12: CPU for arithmetic processing 13: Unit

───────────────────────────────────────────────────── フロントページの続き (72)発明者 平沢 秀夫 群馬県安中市磯部２丁目13番１号 信越 化学工業株式会社 精密機能材料研究所 内 (56)参考文献 特開 平８−40741（ＪＰ，Ａ) 実開 平３−99731（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) C03B 37/012 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hideo Hirasawa 2-13-1, Isobe, Annaka-shi, Gunma Shin-Etsu Chemical Co., Ltd. Precision Functional Materials Research Laboratory (56) References JP-A-8-40741 (JP) , A) Hikaru Hei 3-99731 (JP, U) (58) Field surveyed (Int. Cl. 7 , DB name) C03B 37/012

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 母材インゴットをこれより小径の母材ロ
ッドに延伸して光ファイバ母材を製造する方法におい
て、母材インゴットを延伸装置にセットした状態にて母
材インゴットの中心と延伸装置の軸中心とのずれ量を、
延伸装置のヒーターより上部の母材インゴットの延伸さ
れていない位置にて測定し、母材インゴットの上側把持
部を水平方向に移動させることにより、母材インゴット
の中心が延伸装置の軸中心と一致するよう母材インゴッ
トの位置を移動させることを特徴とする光ファイバ母材
の製造方法。1. A method of manufacturing an optical fiber preform by stretching a preform ingot into a preform rod having a smaller diameter, wherein a center of the preform ingot and a stretching device are set with the preform ingot set in the stretching device. the amount of deviation between the axial center of
Stretch of base material ingot above the heater of the stretching device
Measure at a position where it is not held, and grip the upper side of the base material ingot
A method of manufacturing an optical fiber preform , comprising: moving a portion in a horizontal direction so as to move the position of the preform ingot so that the center of the preform ingot coincides with the axis center of the stretching device.
JP17973395A 1995-07-17 1995-07-17 Manufacturing method of optical fiber preform Expired - Lifetime JP3151387B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17973395A JP3151387B2 (en) 1995-07-17 1995-07-17 Manufacturing method of optical fiber preform

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17973395A JP3151387B2 (en) 1995-07-17 1995-07-17 Manufacturing method of optical fiber preform

Publications (2)

Publication Number Publication Date
JPH0930827A JPH0930827A (en) 1997-02-04
JP3151387B2 true JP3151387B2 (en) 2001-04-03

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Country Link
JP (1) JP3151387B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3437480B2 (en) * 1999-03-12 2003-08-18 信越化学工業株式会社 Adjustment method of glass base material stretching device
KR100611843B1 (en) * 2005-03-07 2006-08-11 엘에스전선 주식회사 System and method for controlling tube diameter while manufacturing optical fiber preform using heating furnace
JP5674160B2 (en) * 2012-05-02 2015-02-25 信越化学工業株式会社 Drawing method of glass base material
JP5854963B2 (en) 2012-10-05 2016-02-09 信越化学工業株式会社 Glass base material drawing equipment

Also Published As

Publication number Publication date
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