JP2000119035A - Production of preform for optical fiber - Google Patents

Production of preform for optical fiber

Info

Publication number
JP2000119035A
JP2000119035A JP10287070A JP28707098A JP2000119035A JP 2000119035 A JP2000119035 A JP 2000119035A JP 10287070 A JP10287070 A JP 10287070A JP 28707098 A JP28707098 A JP 28707098A JP 2000119035 A JP2000119035 A JP 2000119035A
Authority
JP
Japan
Prior art keywords
burner
glass
optical fiber
starting member
outer diameter
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
Application number
JP10287070A
Other languages
Japanese (ja)
Inventor
Sayaka Itou
さやか 伊東
Koichi Harada
光一 原田
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.)
Fujikura Ltd
Original Assignee
Fujikura 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 Fujikura Ltd filed Critical Fujikura Ltd
Priority to JP10287070A priority Critical patent/JP2000119035A/en
Publication of JP2000119035A publication Critical patent/JP2000119035A/en
Pending 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
    • C03B37/014—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]
    • C03B37/01413—Reactant delivery systems
    • C03B37/0142—Reactant deposition burners
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2207/00—Glass deposition burners
    • C03B2207/60—Relationship between burner and deposit, e.g. position
    • C03B2207/66—Relative motion
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2207/00—Glass deposition burners
    • C03B2207/70—Control measures

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a preform for an optical fiber by which a glass microparticle layer having a small fluctuation of outside diameter can be deposited on the outer periphery of a starting member according to an outside vapor-phase deposition method. SOLUTION: This method for producing a preform for an optical fiber is to move the position of a starting point when reciprocating an oxyhydrogen flame burner 2 for each one reciprocation in the method for producing the glass preform for the optical fiber comprising introducing a glass raw material gas into the oxyhydrogen flame burner 2 reciprocating in the longitudinal direction of a rodlike starting member 1 while rotating the rodlike starting member 1 around the shaft thereof, generating glass microparticles by flame hydrolysis and depositing the glass microparticles on the outer periphery of the starting member 1. The moving width thereof is preferably prevented from becoming the same as the pitch width of the fluctuation of the outside diameter of the glass microparticle layer 3 after the deposition. The speed of the reciprocation of the burner 2 is more preferably reduced as the amount of the deposited glass microparticles is increased.

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、いわゆる外付け法
による光ファイバ母材の製造方法に関する。The present invention relates to a method for manufacturing an optical fiber preform by a so-called external method.

【０００２】[0002]

【従来の技術】光ファイバ用ガラス母材の製造方法とし
て、外付け法は良く知られている。この方法は、図４に
示すように、棒状の出発部材１をその軸の周りに回転さ
せつつ、該出発部材１の長手方向に往復動する酸水素火
炎バーナー２にガラス原料ガスを導入し、火炎加水分解
によりガラス微粒子を発生させ該出発部材１の外周にガ
ラス微粒子層３として堆積させる方法である。2. Description of the Related Art As a method for manufacturing a glass preform for an optical fiber, an external method is well known. In this method, as shown in FIG. 4, while rotating a rod-shaped starting member 1 around its axis, a glass raw material gas is introduced into an oxyhydrogen flame burner 2 that reciprocates in the longitudinal direction of the starting member 1, In this method, glass fine particles are generated by flame hydrolysis and deposited on the outer periphery of the starting member 1 as a glass fine particle layer 3.

【０００３】上記酸水素火炎バーナー２の往復動におい
て、該バーナー２へのガラス原料ガス、酸素、水素など
の供給は、例えば、出発部材１の右端から左端に向かう
往路のときに行われ、復路のときには停止される。この
とき、往復動の開始位置と終了位置および往復動の速度
が、往復動の最初から最後まで、同じである。In the reciprocating motion of the oxyhydrogen flame burner 2, the supply of the glass raw material gas, oxygen, hydrogen, etc. to the burner 2 is performed, for example, when the starting member 1 travels from the right end to the left end, and returns. In the case of, it is stopped. At this time, the start position and the end position of the reciprocating motion and the speed of the reciprocating motion are the same from the beginning to the end of the reciprocating motion.

【０００４】このような従来技術により製造された光フ
ァイバ用ガラス母材は、図５に示すように、その長手方
向にわたり、あるピッチ幅（通常約７０ｍｍ程度）をも
った外径変動を生ずることがあった。この外径変動は、
この母材から得られる光ファイバの分散値などの特性変
動を長手方向に生じさせ、さらにこの母材を次の紡糸工
程で紡糸する際に、光ファイバ径の制御を困難にさせ、
紡糸の高速化などの妨げとなっていた。As shown in FIG. 5, the glass preform for an optical fiber manufactured by such a conventional technique has an outer diameter variation with a certain pitch width (usually about 70 mm) over its longitudinal direction. was there. This outer diameter variation is
In the longitudinal direction, characteristic fluctuations such as the dispersion value of the optical fiber obtained from the base material are caused, and when the base material is spun in the next spinning process, it becomes difficult to control the optical fiber diameter,
This hindered the spinning speed.

【０００５】[0005]

【発明が解決しようとする課題】よって、本発明におけ
る課題は、棒状の出発部材をその軸の周りに回転させつ
つ、該出発部材の長手方向に往復動する酸水素火炎バー
ナーにガラス原料ガスを導入し、火炎加水分解によりガ
ラス微粒子を発生させ該出発部材の外周に、外径変動の
小さいガラス微粒子層を堆積させることのできる光ファ
イバ母材の製造方法を提供することにある。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to rotate a rod-shaped starting member around its axis and to feed a glass raw material gas to an oxyhydrogen flame burner reciprocating in the longitudinal direction of the starting member. It is an object of the present invention to provide a method for producing an optical fiber preform which can be introduced to generate glass fine particles by flame hydrolysis and deposit a glass fine particle layer having a small variation in outer diameter on the outer periphery of the starting member.

【０００６】[0006]

【課題を解決するための手段】かかる課題は、棒状の出
発部材をその軸の周りに回転させつつ、該出発部材の長
手方向に往復動する酸水素火炎バーナーにガラス原料ガ
スを導入し、火炎加水分解によりガラス微粒子を発生さ
せ該出発部材の外周に堆積させる際に、該バーナーが往
復動するときの出発点を、該バーナーの１往復動毎に、
その位置を移動させること、望ましくは、この移動幅を
上記堆積後のガラス微粒子層の外径変動のピッチ幅と同
一にならないようにすること、さらに望ましくは、上記
バーナーの往復動の速度を、上記堆積されるガラス微粒
子の量が増加するにつれて減速することによって解決さ
れる。The object of the present invention is to introduce a glass raw material gas into an oxyhydrogen flame burner which reciprocates in the longitudinal direction of the starting member while rotating the starting member in a rod shape around its axis. When generating the glass fine particles by hydrolysis and depositing them on the outer periphery of the starting member, the starting point when the burner reciprocates, every one reciprocation of the burner,
To move the position, desirably, the moving width is not the same as the pitch width of the outer diameter variation of the glass particle layer after the deposition, more preferably, the reciprocating speed of the burner, The problem is solved by slowing down as the amount of glass particles deposited increases.

【０００７】[0007]

【作用】上記バーナーが往復動するときの出発点を、該
バーナーの１往復動毎に、その位置を移動させることに
より、ガラス微粒子層の外径変動が相殺されるため外径
変動幅が小さくなる。The starting point when the above-mentioned burner reciprocates is moved every time the burner reciprocates, so that the fluctuation of the outer diameter of the glass fine particle layer is canceled out. Become.

【０００８】上記バーナーの出発点の位置の移動幅をガ
ラス微粒子層の外径変動のピッチ幅と同一にならないよ
うにすることにより、外径変動の相殺効果が減少するこ
とを防ぐためである。[0008] This is to prevent the offset effect of the outer diameter fluctuation from being reduced by preventing the movement width of the starting point position of the burner from being equal to the pitch width of the outer diameter fluctuation of the glass particle layer.

【０００９】上記バーナーの往復動の速度を、上記堆積
されるガラス微粒子の量が増加するにつれて減速するこ
とにより、該堆積の当初段階ではバーナーの往復動の速
度が早く、１回の往復動で堆積されるガラス微粒子層が
薄くなり、ガラス微粒子層の外径変動が発生しにくいた
めである。By reducing the reciprocating speed of the burner as the amount of the glass particles to be deposited increases, the reciprocating speed of the burner is high in the initial stage of the deposition, and the reciprocating speed of the burner is increased by one reciprocating motion. This is because the glass fine particle layer to be deposited becomes thin, and the outer diameter of the glass fine particle layer hardly fluctuates.

【００１０】[0010]

【発明の実施の形態】図１は本発明の光ファイバ母材の
製造方法の一例を示すものである。図中符号１は、棒状
の出発部材を示す。この出発部材１をその軸の周りに回
転させつつ、該出発部材１の長手方向に往復動する酸水
素火炎バーナー２にガラス原料ガスを導入し、火炎加水
分解によりガラス微粒子を発生させ該出発部材１の外周
にガラス微粒子層３を堆積させる。FIG. 1 shows an example of a method for manufacturing an optical fiber preform according to the present invention. Reference numeral 1 in the drawing indicates a rod-shaped starting member. While rotating the starting member 1 around its axis, a glass raw material gas is introduced into an oxyhydrogen flame burner 2 that reciprocates in the longitudinal direction of the starting member 1 to generate glass fine particles by flame hydrolysis to generate the starting material. A glass fine particle layer 3 is deposited on the outer periphery of 1.

【００１１】上記バーナーの往復動において、例えば、
１回目の往復動の出発点を、図１に示すＡの位置とした
とき、２回目の出発点は出発部材１の中央部寄りの位置
Ｂ、３回目の出発点はＡ点を挟んでＢ点の反対側の位置
Ｃとする。その後は、同じ順番で往復動を繰り返しなが
らガラス微粒子層３を堆積する。このようにすることに
より、それぞれの外径変動を相殺することができる。In the reciprocating motion of the burner, for example,
Assuming that the starting point of the first reciprocation is the position A shown in FIG. 1, the second starting point is a position B near the center of the starting member 1, and the third starting point is a point B across the point A. The position C is on the opposite side of the point. Thereafter, the glass fine particle layer 3 is deposited while repeating reciprocation in the same order. By doing so, the respective outer diameter fluctuations can be offset.

【００１２】上記位置Ａと位置Ｂ、位置Ｂと位置Ｃ、位
置Ｃと位置Ａの間隔は、ガラス微粒子層３の外径変動の
ピッチ幅と同一にならないようにする。これは、外径変
動の相殺効果を減少させないためである。ここでのピッ
チ幅とは、ガラス微粒子層３の外径の長手方向での一変
動周期の始点位置と終点位置との間隔を指している。The intervals between the positions A and B, between the positions B and C, and between the positions C and A are set so as not to be equal to the pitch width of the outer diameter variation of the glass fine particle layer 3. This is because the effect of offsetting the outer diameter fluctuation is not reduced. Here, the pitch width indicates an interval between the start point position and the end point position of one fluctuation period in the longitudinal direction of the outer diameter of the glass particle layer 3.

【００１３】上記バーナー２の往復動の速度は、ガラス
微粒子の堆積の当初段階では、早くして、該ガラス微粒
子堆積量が増加するにつれて減速する。例えば、最終段
階のバーナー２の往復動の速度をＶとすると、当初段階
の速度は２Ｖ〜６Ｖとする。このように当初段階のバー
ナーの往復動の速度を早くすることにより、１回の往復
動で堆積されるガラス微粒子層が薄くなり、ガラス微粒
子層の外径変動が発生しにくくなる。さらに、上記当初
段階を過ぎた後は、バーナー２の速度を遅くして、ガラ
ス微粒子の堆積効率を高くする。上記当初段階、最終段
階の目安としては、ガラス微粒子層３の全堆積量の約半
分までを当初段階とし、残りの約半分を最終段階とする
設定が望ましい。The reciprocating speed of the burner 2 is increased in the initial stage of the deposition of the glass particles, and is reduced as the amount of glass particles deposited increases. For example, assuming that the reciprocating speed of the burner 2 in the final stage is V, the speed in the initial stage is 2V to 6V. By increasing the reciprocating speed of the burner in the initial stage in this way, the glass fine particle layer deposited by one reciprocating movement becomes thin, and the outer diameter of the glass fine particle layer hardly fluctuates. Further, after the initial stage, the speed of the burner 2 is reduced to increase the deposition efficiency of the glass particles. As a guide for the initial stage and the final stage, it is desirable that up to about half of the total deposition amount of the glass fine particle layer 3 be the initial stage and the other half be the final stage.

【００１４】上記バーナー２が往復動するときの出発点
を、該バーナーの１往復動毎に、その位置をＡからＢ
へ、ＢからＣへ、さらにＣからＡへ移動させることによ
り、ガラス微粒子層３の外径の最大値および最小値の発
生する位置を移動させて、位置Ａ、Ｂ、Ｃのときの外径
変動をお互いに相殺させることができ、ガラス微粒子層
３全体としての外径変動幅を小さくすることができる。The starting point of the reciprocation of the burner 2 is defined as the position from A to B for each reciprocation of the burner.
, From B to C, and from C to A, the position where the maximum value and the minimum value of the outer diameter of the glass fine particle layer 3 are generated is moved, and the outer diameter at the positions A, B, and C is moved. The fluctuations can be offset each other, and the outer diameter fluctuation width of the entire glass fine particle layer 3 can be reduced.

【００１５】また、上記バーナー２の出発点の位置の移
動幅を、ガラス微粒子層の外径変動のピッチ幅と同一に
ならないようにすることにより、上記外径変動の相殺効
果が減少することを防ぐことができる。Further, by making the moving width of the position of the starting point of the burner 2 not to be the same as the pitch width of the outer diameter fluctuation of the glass fine particle layer, the effect of offsetting the outer diameter fluctuation is reduced. Can be prevented.

【００１６】上記バーナー２の往復動の速度を、上記堆
積されるガラス微粒子の量が増加するにつれて減速する
ことにより、該堆積の当初段階ではバーナー２の往復動
の速度が早く、１回の往復動で堆積されるガラス微粒子
層３を薄くすることができ、ガラス微粒子層３の外径変
動を小さくすることができる。By reducing the reciprocating speed of the burner 2 as the amount of the glass particles to be deposited increases, the reciprocating speed of the burner 2 is increased in the initial stage of the deposition, so that one reciprocation is performed. The glass fine particle layer 3 deposited by movement can be made thinner, and the outer diameter fluctuation of the glass fine particle layer 3 can be reduced.

【００１７】詳しくは実施例において説明するが、請求
項３の光ファイバ母材の製造方法によると、バーナー２
の往復動の出発点の移動による外径変動の相殺効果と、
バーナー２の速度を当初段階で早くすることによる往復
動１回当たりのガラス微粒子の堆積薄層化効果の相乗効
果を得ることができ、ガラス微粒子層３の外径変動幅
を、従来技術に比べて、約４分の１に低減できる。Although described in detail in the embodiments, according to the method for manufacturing an optical fiber preform according to claim 3, the burner 2
Offset effect of outer diameter fluctuation by moving the starting point of reciprocation of
By increasing the speed of the burner 2 in the initial stage, it is possible to obtain a synergistic effect of the effect of thinning and depositing the glass fine particles per one reciprocation, and to make the outer diameter fluctuation width of the glass fine particle layer 3 smaller than that of the prior art. Therefore, it can be reduced to about one fourth.

【００１８】また、上記堆積薄層化は単に外径変動の低
減効果のみならず、後の焼結工程での出発部材とガラス
微粒子堆積層とのズレを防止する効果も発揮する。Further, the above-mentioned thinning of the deposited layer not only has the effect of reducing the fluctuation of the outer diameter, but also has the effect of preventing the deviation between the starting member and the deposited layer of glass fine particles in the subsequent sintering step.

【００１９】酸水素火炎バーナー２に供給されるガラス
原料ガスは典型的にＳｉＣｌ4であり、出発部材１は典
型的にＧｅＯ2ーＳｉＯ2ガラスロッドやＳｉ０2ガラス
ロッドである。The glass raw material gas supplied to the oxyhydrogen flame burner 2 is typically a SiCl 4, starting member 1 is typically GeO 2 over SiO 2 glass rod and Si0 2 glass rod.

【００２０】酸水素火炎バーナー２の本数は、１本に限
らず複数本を往復動させても良い。バーナーを複数本に
すると、バーナー相互の間隔距離をガラス微粒子層の外
径変動のピッチ幅と同一にならないようにすることによ
り、上記よりさらなる外径変動幅の減少効果を得ること
ができる。The number of oxyhydrogen flame burners 2 is not limited to one, and a plurality of oxyhydrogen flame burners may be reciprocated. When a plurality of burners are used, the distance between the burners is made not to be the same as the pitch width of the outer diameter variation of the glass fine particle layer, so that the effect of further reducing the outer diameter variation width can be obtained.

【００２１】[0021]

【実施例】以下、本発明を実施例を示して詳しく説明す
る。本実施例１では、図１に示した方法により光ファイ
バ母材を作成した。外径２０ｍｍの出発部材１をその軸
の周りに回転させつつ、該出発部材１の長手方向に往復
動する酸水素火炎バーナー２にガラス原料ガスを導入
し、火炎加水分解によりガラス微粒子を発生させ該出発
部材１の外周に堆積させて、外径２００ｍｍのガラス微
粒子層３を得た。このときの上記バーナー２の往復動に
おいて、１回目の往復動の出発点を、図１に示すＡの位
置とし、２回目の出発点は位置Ｂ、３回目の出発点は位
置Ｃとした。位置Ａと位置Ｂの間隔が２０ｍｍ、位置Ａ
と位置Ｃの間隔が２０ｍｍであった。さらにその後は、
同じ順番で往復動を繰り返しながらガラス微粒子層３を
堆積した。また、このときの上記バーナー２の往復動の
速度は、５５ｍｍ／分で、当初段階から最終段階まで同
じであった。上記の製造方法で得た光ファイバ母材の外
径変動の測定結果を図２に示す。本実施例１の外径変動
幅は０．５％で、図５に示す比較例の外径変動幅１．２
％に比べて小さくなっている。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. In Example 1, an optical fiber preform was prepared by the method shown in FIG. While rotating the starting member 1 having an outer diameter of 20 mm around its axis, a glass raw material gas is introduced into the oxyhydrogen flame burner 2 which reciprocates in the longitudinal direction of the starting member 1, and glass fine particles are generated by flame hydrolysis. The glass particle layer 3 having an outer diameter of 200 mm was deposited on the outer periphery of the starting member 1. In the reciprocating motion of the burner 2 at this time, the starting point of the first reciprocating motion was position A shown in FIG. 1, the second starting point was position B, and the third starting point was position C. The distance between position A and position B is 20 mm, position A
And the interval between the positions C was 20 mm. After that,
The glass fine particle layer 3 was deposited while repeating reciprocation in the same order. The reciprocating speed of the burner 2 at this time was 55 mm / min, which was the same from the initial stage to the final stage. FIG. 2 shows the measurement results of the outer diameter variation of the optical fiber preform obtained by the above manufacturing method. The outer diameter fluctuation width of Example 1 was 0.5%, and the outer diameter fluctuation width of the comparative example shown in FIG.
%.

【００２２】本実施例２では、図１に示した方法により
光ファイバ母材を作成した。外径２０ｍｍの出発部材１
をその軸の周りに回転させつつ、該出発部材１の長手方
向に往復動する酸水素火炎バーナー２にガラス原料ガス
を導入し、火炎加水分解によりガラス微粒子を発生させ
該出発部材１の外周に堆積させて、外径２００ｍｍのガ
ラス微粒子層３を得た。このときの上記バーナー２の往
復動において、１回目の往復動の出発点を、図１に示す
Ａの位置とし、２回目の出発点は位置Ｂ、３回目の出発
点は位置Ｃとした。位置Ａと位置Ｂの間隔が２０ｍｍ、
位置Ａと位置Ｃの間隔が２０ｍｍであった。さらにその
後は、同じ順番で往復動を繰り返しながらガラス微粒子
層３を堆積した。また、このときの上記バーナー２の往
復動の速度は、当初段階は２２０ｍｍ／分で、該ガラス
微粒子が目標堆積量の半分に達した後は、５５ｍｍ／分
であった。上記の製造方法で得た光ファイバ母材の外径
変動の測定結果を図３に示す。本実施例２の外径変動幅
は０．３％で、図５に示す比較例の外径変動幅１．２％
に比べて小さくなっていることは勿論のこと、実施例１
に比べて、さらに小さくなっている。In Example 2, an optical fiber preform was prepared by the method shown in FIG. Starting member 1 with outer diameter 20mm
While rotating around the axis, a glass raw material gas is introduced into an oxyhydrogen flame burner 2 which reciprocates in the longitudinal direction of the starting member 1 to generate glass fine particles by flame hydrolysis, thereby forming a glass particle on the outer periphery of the starting member 1. By deposition, a glass fine particle layer 3 having an outer diameter of 200 mm was obtained. In the reciprocating motion of the burner 2 at this time, the starting point of the first reciprocating motion was position A shown in FIG. 1, the second starting point was position B, and the third starting point was position C. The distance between position A and position B is 20 mm,
The distance between the position A and the position C was 20 mm. Thereafter, the glass fine particle layer 3 was deposited while reciprocating in the same order. The reciprocating speed of the burner 2 at this time was 220 mm / min in the initial stage, and was 55 mm / min after the glass particles reached half the target deposition amount. FIG. 3 shows a measurement result of the outer diameter variation of the optical fiber preform obtained by the above-described manufacturing method. The outer diameter fluctuation width of Example 2 was 0.3%, and the outer diameter fluctuation width of the comparative example shown in FIG. 5 was 1.2%.
Example 1 is, of course, smaller than
It is even smaller than.

【００２３】尚、上記２つの実施例では、位置Ａと位置
Ｂの間隔と、位置Ａと位置Ｃの間隔を等間隔にしたが、
このような等間隔に限らず、非等間隔のときも同様な効
果を得ることができる。In the above two embodiments, the interval between the position A and the position B and the interval between the position A and the position C are equal.
The same effect can be obtained not only at such equal intervals but also at non-equal intervals.

【００２４】本比較例では、図４に示した方法により光
ファイバ母材を作成した。外径２０ｍｍの出発部材１を
その軸の周りに回転させつつ、該出発部材１の長手方向
に往復動する酸水素火炎バーナー２にガラス原料ガスを
導入し、火炎加水分解によりガラス微粒子を発生させ該
出発部材１の外周に堆積させて、外径２００ｍｍのガラ
ス微粒子層３を得た。このときの上記バーナー２の往復
動において、該往復動の出発点はいつも、図４に示すＡ
の位置であった。このような往復動を繰り返しながらガ
ラス微粒子層３を堆積した。また、このときの上記バー
ナー２の往復動の速度は、５５ｍｍ／分で、当初段階か
ら最終段階まで同じであった。上記の製造方法で得た光
ファイバ母材の外径変動の測定結果を図５に示す。本比
較例の外径変動幅は１．２％であった。In this comparative example, an optical fiber preform was prepared by the method shown in FIG. While rotating the starting member 1 having an outer diameter of 20 mm around its axis, a glass raw material gas is introduced into the oxyhydrogen flame burner 2 which reciprocates in the longitudinal direction of the starting member 1, and glass fine particles are generated by flame hydrolysis. The glass particle layer 3 having an outer diameter of 200 mm was deposited on the outer periphery of the starting member 1. In the reciprocating motion of the burner 2 at this time, the starting point of the reciprocating motion is always the point A shown in FIG.
Was in the position. The glass particle layer 3 was deposited while repeating such a reciprocating motion. The reciprocating speed of the burner 2 at this time was 55 mm / min, which was the same from the initial stage to the final stage. FIG. 5 shows the measurement results of the outer diameter variation of the optical fiber preform obtained by the above-described manufacturing method. The fluctuation range of the outer diameter of this comparative example was 1.2%.

【００２５】[0025]

【発明の効果】以上説明したように、請求項１および２
に記載の発明によれば、バーナーの往復動の出発点の移
動による外径変動の相殺効果が得られる。請求項３に記
載の発明によれば、バーナーの速度を当初段階で早くす
ることによる往復動１回当たりのガラス微粒子の堆積薄
層化効果も得ることができ、前記相殺効果との相乗効果
により、光ファイバ母材の外径変動を大幅に低減でき
る。As described above, claims 1 and 2
According to the invention described in (1), the effect of canceling the outer diameter fluctuation due to the movement of the starting point of the reciprocating motion of the burner can be obtained. According to the third aspect of the invention, the effect of increasing the burner speed at the initial stage can also achieve the effect of thinning and depositing the glass fine particles per one reciprocation, and the synergistic effect with the canceling effect can be obtained. In addition, variation in the outer diameter of the optical fiber preform can be greatly reduced.

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

【図１】 本発明の光ファイバ母材の製造方法の一例を
示す構成図である。FIG. 1 is a configuration diagram illustrating an example of a method for manufacturing an optical fiber preform of the present invention.

【図２】 実施例１で得られた光ファイバ母材の外径変
動の測定結果を示す図表である。FIG. 2 is a table showing the measurement results of the outer diameter variation of the optical fiber preform obtained in Example 1.

【図３】 実施例２で得られた光ファイバ母材の外径変
動の測定結果を示す図表である。FIG. 3 is a table showing a measurement result of an outer diameter variation of an optical fiber preform obtained in Example 2.

【図４】 従来技術の光ファイバ母材の製造方法を示す
構成図である。FIG. 4 is a configuration diagram showing a conventional method for manufacturing an optical fiber preform.

【図５】 比較例で得られた光ファイバ母材の外径変動
の測定結果を示す図表である。FIG. 5 is a table showing measurement results of outer diameter fluctuation of an optical fiber preform obtained in a comparative example.

【符号の説明】[Explanation of symbols]

１…棒状の出発部材 ２…酸水素火炎バーナー ３…ガ
ラス微粒子層1 ... rod-shaped starting member 2 ... oxyhydrogen flame burner 3 ... glass fine particle layer

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 棒状の出発部材をその軸の周りに回転さ
せつつ、該出発部材の長手方向に往復動する酸水素火炎
バーナーにガラス原料ガスを導入し、火炎加水分解によ
りガラス微粒子を発生させ該出発部材の外周に堆積させ
る光ファイバ用ガラス母材の製造方法において、 該バーナーが往復動するときの出発点を、該バーナーの
１往復動毎に、そ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 glass raw material gas is introduced into an oxyhydrogen flame burner reciprocating in the longitudinal direction of a rod-shaped starting member while rotating the rod-shaped starting member around its axis, and glass fine particles are generated by flame hydrolysis. In the method for producing a glass preform for optical fibers deposited on the outer periphery of the starting member, the starting point at which the burner reciprocates is moved at each reciprocation of the burner. A method for manufacturing an optical fiber preform. 【請求項２】 上記バーナーが往復動するときの出発点
を、該バーナーの１往復動毎に、その位置を移動させる
際に、該移動幅を上記堆積後のガラス微粒子層の外径変
動のピッチ幅と同一にならないようにすることを特徴と
する請求項１記載の光ファイバ母材の製造方法。2. A starting point when the burner reciprocates is set to a position at which the burner reciprocates for each reciprocation of the burner. 2. The method for manufacturing an optical fiber preform according to claim 1, wherein the pitch width is not equal to the pitch width. 【請求項３】 上記バーナーの往復動の速度を、上記堆
積されるガラス微粒子の量が増加するにつれて減速する
ことを特徴とする請求項１または２記載の光ファイバ母
材の製造方法。3. The method of manufacturing an optical fiber preform according to claim 1, wherein the reciprocating speed of the burner is reduced as the amount of the deposited glass particles increases.
JP10287070A 1998-10-08 1998-10-08 Production of preform for optical fiber Pending JP2000119035A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10287070A JP2000119035A (en) 1998-10-08 1998-10-08 Production of preform for optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10287070A JP2000119035A (en) 1998-10-08 1998-10-08 Production of preform for optical fiber

Publications (1)

Publication Number Publication Date
JP2000119035A true JP2000119035A (en) 2000-04-25

Family

ID=17712671

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10287070A Pending JP2000119035A (en) 1998-10-08 1998-10-08 Production of preform for optical fiber

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Country Link
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002090276A1 (en) * 2001-04-27 2002-11-14 Pirelli & C. S.P.A. Method for producing an optical fiber preform
KR100507622B1 (en) * 2002-10-17 2005-08-10 엘에스전선 주식회사 Method and apparatus for fabricating an optical fiber preform in OVD
US8516855B2 (en) 2001-04-27 2013-08-27 Prysmian Cavi E Sistemi Energia S.R.L. Method for producing an optical fiber preform
WO2019044805A1 (en) * 2017-08-29 2019-03-07 住友電気工業株式会社 Method for producing glass fine particle deposit, method for producing glass matrix, and glass matrix
CN111032587A (en) * 2017-08-29 2020-04-17 住友电气工业株式会社 Method for producing glass microparticle-deposited body, method for producing glass base material, and glass microparticle-deposited body

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002090276A1 (en) * 2001-04-27 2002-11-14 Pirelli & C. S.P.A. Method for producing an optical fiber preform
US8516855B2 (en) 2001-04-27 2013-08-27 Prysmian Cavi E Sistemi Energia S.R.L. Method for producing an optical fiber preform
KR100507622B1 (en) * 2002-10-17 2005-08-10 엘에스전선 주식회사 Method and apparatus for fabricating an optical fiber preform in OVD
WO2019044805A1 (en) * 2017-08-29 2019-03-07 住友電気工業株式会社 Method for producing glass fine particle deposit, method for producing glass matrix, and glass matrix
CN111032587A (en) * 2017-08-29 2020-04-17 住友电气工业株式会社 Method for producing glass microparticle-deposited body, method for producing glass base material, and glass microparticle-deposited body
CN111051259A (en) * 2017-08-29 2020-04-21 住友电气工业株式会社 Method for producing glass fine particle deposit, method for producing glass base material, and glass base material
JPWO2019044805A1 (en) * 2017-08-29 2020-10-01 住友電気工業株式会社 Manufacturing method of glass fine particle deposit, manufacturing method of glass base material and glass base material
CN111032587B (en) * 2017-08-29 2022-12-30 住友电气工业株式会社 Method for producing glass microparticle-deposited body, method for producing glass base material, and glass microparticle-deposited body

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