JP2000256024A - Processing method for glass rod - Google Patents
Processing method for glass rodInfo
- Publication number
- JP2000256024A JP2000256024A JP6500299A JP6500299A JP2000256024A JP 2000256024 A JP2000256024 A JP 2000256024A JP 6500299 A JP6500299 A JP 6500299A JP 6500299 A JP6500299 A JP 6500299A JP 2000256024 A JP2000256024 A JP 2000256024A
- Authority
- JP
- Japan
- Prior art keywords
- diameter
- glass rod
- small
- diameter portion
- chucks
- 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.)
- Granted
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
- C03B37/012—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
- C03B37/01254—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing by expanding radially, e.g. by forcing a mandrel through or axial pressing a tube or rod
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ガラスロッド、特
に光ファイバ用として好適な所定の外径を有するガラス
ロッドの加工方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing a glass rod, in particular, a glass rod having a predetermined outer diameter suitable for an optical fiber.
【０００２】[0002]
【従来の技術】従来、ガラスロッドは様々な用途に使用
されているが、なかでも光ファイバ用に供されるガラス
ロッドは、外径が一様でなく変動していると、光ファイ
バ線引炉にガラスロッドを挿入する開口部をその変動分
だけ広げざるを得ず、線引炉のシール性に問題を生じ
る。さらに、ファイバ径やファイバの特性が変動する等
の問題を生じるため、光ファイバ用ガラスロッドは、部
分的に径変動のない一様な径とする必要がある。2. Description of the Related Art Conventionally, glass rods have been used for various purposes. In particular, glass rods used for optical fibers are not suitable for drawing optical fibers if their outer diameters are not uniform and fluctuate. The opening for inserting the glass rod into the furnace has to be widened by the amount of the fluctuation, which causes a problem in the sealing performance of the drawing furnace. Furthermore, since problems such as a change in the fiber diameter and the characteristics of the fiber occur, it is necessary that the glass rod for an optical fiber has a uniform diameter without a partial diameter change.
【０００３】ガラスロッドを延伸して径を一定にする方
法は、多種提案されている（特開昭５６−４５８４３号
公報、特開昭５６−９２３１号公報、特開昭５９−２０
７８４９号公報、特開昭６０−２６０４２９号公報、特
開昭６０−２６０４３９号公報、特開昭６１−２１５９
０７号公報、特開昭６１−２９５２５０号公報、特開昭
６１−２９５２５１号公報、特開昭６１−２９５２５２
号公報、６２−２０２８３０号公報参照）。上記これら
の公報には、ガラス母材を加熱延伸し縮径してガラスロ
ッドを得ること、また外径を測定して引伸し速度を調整
制御することが記載されているが、得られたガラスロッ
ドには径の細い部分、つまり局所的に細径部を生じるこ
とがあった。Various methods have been proposed for stretching a glass rod to make the diameter constant (JP-A-56-45843, JP-A-56-9231, JP-A-59-20).
No. 7849, JP-A-60-260429, JP-A-60-260439, JP-A-61-2159
No. 07, JP-A-61-295250, JP-A-61-295251, JP-A-61-295252
Gazette, 62-202830 gazette). These publications describe that a glass base material is heated and stretched to reduce the diameter to obtain a glass rod, and that the outer diameter is measured to control the stretching speed. In some cases, a small diameter portion, that is, a small diameter portion was locally generated.
【０００４】このような局所的に細径部を有するガラス
ロッドを不良品として没処理すると、製造コストの増大
を招くという問題があった。このため、局所的に細径部
を有するガラスロッドを、一番径の細い部分に合せて再
延伸する方法が採られるが、径が細くなったり、太くな
ったりして一様な外径を有するガラスロッドを安定して
再延伸することができず、かつ径の細い部分に合せて全
長に亙って再延伸する必要があり、再延伸のため長時間
を要するという問題があった。If the glass rod having such a locally small diameter portion is submerged as a defective product, there is a problem that the manufacturing cost is increased. For this reason, a method is employed in which a glass rod having a locally small diameter portion is stretched again in accordance with the thinnest portion, but the outer diameter becomes thinner or thicker so that a uniform outer diameter is obtained. There is a problem that the glass rod cannot be stably re-drawn, and it is necessary to re-draw the entire length in accordance with the portion having a small diameter, and it takes a long time for the re-drawing.
【０００５】[0005]
【発明が解決しようとする課題】本発明の目的は、局所
的に細径部を有するガラスロッドを、容易かつ短時間の
処理で、一様な外径を有するガラスロッドに加工する方
法を提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a method of processing a glass rod having a locally small diameter portion into a glass rod having a uniform outer diameter by an easy and short-time treatment. The purpose is to do.
【０００６】[0006]
【課題を解決するための手段】本発明者等は、上記課題
を解決するため、鋭意研究の結果、ガラスロッドの細径
部を加熱して軟化させ、ガラスロッドの長手方向から押
圧力を細径部に加えると、この細径部を増径し得ること
を見出し、さらに、増径すべき加熱箇所の径を測定して
得られた実測径と、予め設定された設定径との比較演算
を行い、この演算値に基づき押圧力すなわちチャックの
移動速度や加熱手段の移動速度等を制御することにより
一様な径を有するガラスロッドが得られることを見出
し、本発明を完成したものである。Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have conducted intensive studies and, as a result, heated and softened the small diameter portion of the glass rod, and reduced the pressing force from the longitudinal direction of the glass rod. It was found that adding to the diameter part could increase the diameter of the small diameter part, and furthermore, a comparison operation between an actually measured diameter obtained by measuring the diameter of a heated portion to be increased and a preset diameter was set. And found that a glass rod having a uniform diameter can be obtained by controlling the pressing force, that is, the moving speed of the chuck, the moving speed of the heating means, and the like based on the calculated value, and completed the present invention. .
【０００７】すなわち、請求項１に記載の発明は、局所
的に細径部を有するガラスロッドをガラス旋盤の両チャ
ック間に固定し、細径部を加熱しつつ、少なくとも一方
のチャックを移動させて両チャック間距離を短縮し、細
径部が所定の径となるまで増径して径の一様なガラスロ
ッドに加工することを特徴としている。That is, according to the present invention, a glass rod having a locally small diameter portion is fixed between both chucks of a glass lathe, and at least one of the chucks is moved while heating the small diameter portion. The distance between the two chucks is reduced to increase the diameter of the small-diameter portion until a predetermined diameter is reached, thereby forming a glass rod having a uniform diameter.
【０００８】請求項２に記載の発明は、ガラスロッドを
ガラス旋盤の両チャック間に固定し、該ガラスロッドに
沿って外径測定器を走査させて所定の径との比較演算を
行い、局所的細径部とその位置を検出し、検出された細
径部の位置に加熱手段を移動させて細径部を加熱し軟化
させ、少なくとも一方のチャックを移動させて細径部が
所定の径となるまで両チャック間距離を短縮することに
より、細径部を増径して径の一様なガラスロッドに加工
することを特徴としている。According to a second aspect of the present invention, a glass rod is fixed between both chucks of a glass lathe, an outer diameter measuring device is scanned along the glass rod, a comparison operation with a predetermined diameter is performed, and a local operation is performed. The small diameter portion and its position are detected, the heating means is moved to the detected position of the small diameter portion to heat and soften the small diameter portion, and at least one of the chucks is moved so that the small diameter portion has a predetermined diameter. By shortening the distance between the two chucks until the diameter becomes smaller, the diameter of the small-diameter portion is increased to form a glass rod having a uniform diameter.
【０００９】ガラスロッドの細径部を加熱して増径する
に際し、両チャック間に固定されたガラスロッドを回転
させつつガス火炎で加熱するのが好ましい。また、チャ
ックを移動させてガラスロッドの細径部に押圧力を加え
るためのチャックの移動速度や加熱手段の移動速度は、
ガラスロッドの増径すべき加熱箇所の径を測定して得ら
れた実測径と、予め設定された設定径との比較演算値に
基づき制御される。When the small diameter portion of the glass rod is heated to increase the diameter, it is preferable that the glass rod fixed between both chucks is heated by a gas flame while rotating. In addition, the moving speed of the chuck and the moving speed of the heating means for moving the chuck to apply a pressing force to the small diameter portion of the glass rod,
The control is performed based on a comparison calculation value between an actually measured diameter obtained by measuring the diameter of a heated portion of the glass rod to be increased and a preset set diameter.
【００１０】[0010]
【発明の実施の形態】製造されたガラスロッドは、その
全長に亙って外径測定が行われ、局所的に細径部が存在
するガラスロッドは一様な径とするため、加工工程に移
され、ガラス旋盤の両チャック間に固定して、ガラスロ
ッドを回転させつつガス火炎で細径部を加熱し、少なく
とも一方のチャックを移動させて両チャック間距離を短
縮することにより、ガラスロッドの細径部に押圧力がか
けられ、増径される。チャックの移動速度は、加工作業
中、ガラスロッドの増径すべき加熱箇所の径が繰り返し
測定され、この測定して得られた実測径と、予め設定さ
れた設定径との比較演算値に基づき制御され、加熱部が
所定の径となるまで続けられる。BEST MODE FOR CARRYING OUT THE INVENTION The outer diameter of a manufactured glass rod is measured over its entire length, and a glass rod having a locally small diameter portion has a uniform diameter. Transferred, fixed between the two chucks of the glass lathe, heating the small diameter portion with a gas flame while rotating the glass rod, moving at least one of the chucks to reduce the distance between the two chucks, A pressing force is applied to the small-diameter portion to increase the diameter. The moving speed of the chuck is determined based on a comparison between a measured diameter obtained by measuring the diameter of the heated portion of the glass rod to be increased during the processing operation and a preset diameter. It is controlled and continued until the heating section reaches a predetermined diameter.
【００１１】また、予め外径測定がなされたガラスロッ
ドをガラス旋盤にセットして、細径部を増径するのでは
なく、外径未測定のガラスロッドをガラス旋盤にセット
して、外径測定と細径部の増径を一工程で行うこともで
きる。すなわち、外径未測定のガラスロッドをガラス旋
盤にセットし、ガラスロッドに沿って外径測定器を走査
させて外径を測定しつつ設定した径との比較演算を行う
ことにより、局所的細径部とその位置を検出し、検出さ
れた細径部の位置に加熱手段を移動させて細径部の増径
を行う方法である。加熱手段としては、バーナー加熱、
電気抵抗加熱、高周波加熱等が挙げられるが、好ましく
はバーナー加熱である。Also, instead of setting a glass rod whose outer diameter has been measured in advance on a glass lathe and increasing the diameter of the small diameter portion, setting a glass rod whose outer diameter has not been measured on the glass lathe, The measurement and the increase in the diameter of the small diameter portion can be performed in one step. That is, a glass rod whose outer diameter has not been measured is set on a glass lathe, and an outer diameter measuring device is scanned along the glass rod to measure the outer diameter and perform a comparison operation with the set diameter, thereby obtaining a local fineness. This method detects the diameter portion and its position, and moves the heating means to the detected position of the small diameter portion to increase the diameter of the small diameter portion. As the heating means, burner heating,
Electric resistance heating, high-frequency heating and the like can be mentioned, but burner heating is preferred.
【００１２】チャックの移動は、加熱軟化された細径部
に押圧力を作用させるために行われるが、この手段とし
て、一方のチャックを固定して他方のチャックを移動さ
せる方法、あるいは、両チャックを細径部に向かって同
期させて移動させる方法があり、いずれを採用してもよ
い。The movement of the chuck is performed in order to apply a pressing force to the heat-softened small-diameter portion. As this means, a method in which one chuck is fixed and the other chuck is moved, or both chucks are moved. Are moved synchronously toward the small diameter portion, and any of them may be adopted.
【００１３】[0013]
【実施例】（実施例）ガラス旋盤の左側チャックに外径
６０ｍｍφ、長さ３５０ｍｍのダミー棒を把持させ、右
側チャックには外径が７０〜８０ｍｍφ、長さ５００ｍ
ｍの被加工ガラスロッドを把持させ、チャックを移動さ
せてダミー棒と被加工ガラスロッドとを近づけた後、２
５ｒｐｍで回転させながら酸水素バーナー（水素５００
リットル／分、酸素２３０リットル／分）で、ダミー棒と被加工
ガラスロッドが対向する部分を同時に加熱し、両部が軟
化したところで溶着する。溶着したロッドは左側チャッ
クで支持し、右側チャックには、左側と同様に外径６０
ｍｍφ、長さ３５０ｍｍのダミー棒を加熱しロッドと溶
着する。このようにしてガラスロッドの両端にダミー棒
が溶着される。(Example) A left chuck of a glass lathe grips a dummy rod having an outer diameter of 60 mmφ and a length of 350 mm, and a right chuck has an outer diameter of 70 to 80 mmφ and a length of 500 m.
After holding the glass rod to be processed and moving the chuck to bring the dummy rod close to the glass rod to be processed, 2
While rotating at 5 rpm, an oxyhydrogen burner (hydrogen 500
(Liter / minute, oxygen 230 liter / minute), the portions where the dummy rod and the glass rod to be processed face each other are heated simultaneously, and when both portions are softened, they are welded. The welded rod is supported by the left chuck, and the right chuck has an outer diameter of 60 mm as with the left chuck.
A dummy rod having a diameter of 350 mm and a length of 350 mm is heated and welded to the rod. In this way, dummy rods are welded to both ends of the glass rod.
【００１４】次に、被加工ガラスロッドに沿って外径測
定器を走査させて外径を測定した。この測定により検出
された細径部に基づいて加工範囲を設定した後、この加
工範囲を外径測定器の位置でコンピューターに入力し
た。さらに、目標とする加工後の外径設定値（８５ｍｍ
φ）と、加工中、外径測定器で実測された加熱部の外径
実測値と設定値とを比較演算して得られる演算値と、チ
ャックの移動速度との相対関係、加熱バーナーの移動速
度、位置、さらに酸素、水素ガス量等をコンピューター
に入力した。増径加工は、コンピューターに予め入力し
た条件に基づき自動で細径部の増径が行われる。すなわ
ち、加工範囲指定後、自動で径測定を開始し、バーナー
が加工スタート位置に着き、回転数２５ｒｐｍで被加工
ガラスロッドを回転させ、酸素、水素ガスが自動設定さ
れて加熱を始め、軟化するとバーナー及び右側チャック
が設定された速度で移動し、細径部の増径を行う。この
間、設定された時間間隔で外径測定、設定値との比較演
算が行われ、その都度、演算値情報がチャックやバーナ
ーの移動速度等にフィードバックされて増径加工が自動
的に進行する。このようにして加工されたガラスロッド
の仕上り寸法は、外径７９．７ｍｍφで、長手方向の径
変動０．５７ｍｍのガラスロッドが出来た。Next, the outer diameter was measured by scanning the outer diameter measuring device along the glass rod to be processed. After setting a processing range based on the small-diameter portion detected by this measurement, the processing range was input to a computer at the position of the outer diameter measuring device. Furthermore, the target outer diameter set value after processing (85 mm
φ) and the relative value between the calculated value obtained by comparing the measured value of the outer diameter of the heating part measured by the outer diameter measuring device with the set value during processing and the set value, the moving speed of the chuck, and the movement of the heating burner. The speed, position, and oxygen and hydrogen gas amounts were input to a computer. In the diameter-increasing process, the diameter of the small-diameter portion is automatically increased based on conditions previously input to a computer. That is, after the processing range is specified, the diameter measurement is automatically started, the burner reaches the processing start position, the glass rod to be processed is rotated at a rotation speed of 25 rpm, oxygen and hydrogen gas are automatically set, heating is started, and softening is started. The burner and the right chuck move at a set speed to increase the diameter of the small diameter portion. During this time, the outer diameter is measured and the calculated value is compared with the set value at set time intervals. Each time, the calculated value information is fed back to the moving speed of the chuck or the burner, and the diameter increasing process automatically proceeds. The finished dimensions of the glass rod processed in this way were a glass rod having an outer diameter of 79.7 mmφ and a diameter variation of 0.57 mm in the longitudinal direction.
【００１５】[0015]
【発明の効果】上記したように、自動制御で容易に、ガ
ラスロッドの細径部に増径加工が短時間でなされ、外径
の一様なガラスロッドとすることができる。さらに、細
径部のみの部分的な処理でよいため、加工時間が短縮さ
れ、径が細くなりすぎたり、長くなりすぎたりすること
も防止される。As described above, the diameter of the small diameter portion of the glass rod can be easily increased by automatic control in a short time, and a glass rod having a uniform outer diameter can be obtained. Further, since only partial processing of the small diameter portion is sufficient, the processing time is shortened, and the diameter is prevented from becoming too small or too long.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 越谷 隆 群馬県安中市磯部２丁目13番１号 信越化 学工業株式会社群馬事業所内 (72)発明者 丸山 久夫 群馬県安中市磯部２丁目13番１号 信越包 装株式会社内 (72)発明者 島田 忠克 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 (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 Ｆターム(参考） 4G015 BA01 BB01 BB05 4G021 BA03 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Koshigaya 2-13-1, Isobe, Annaka-shi, Gunma Shin-Etsu Kagaku Kogyo Co., Ltd. Gunma Office (72) Inventor Hisao Maruyama 2-chome Isobe, Annaka-shi, Gunma 13-1 Shin-Etsu Packaging Co., Ltd. (72) Inventor Tadakatsu Shimada 2-3-1 Isobe, Annaka-shi, Gunma Prefecture Shin-Etsu Chemical Co., Ltd.Precision Functional Materials Laboratory (72) Inventor Hideo Hirasawa Gunma An 2-13-1 Nakabe Isobe Shin-Etsu Kagaku Kogyo Co., Ltd. Precision Functional Materials Laboratory F-term (reference) 4G015 BA01 BB01 BB05 4G021 BA03
Claims (4)
ガラス旋盤の両チャック間に固定し、細径部を加熱しつ
つ、少なくとも一方のチャックを移動させて両チャック
間距離を短縮し、細径部が所定の径となるまで増径して
径の一様なガラスロッドに加工することを特徴とするガ
ラスロッドの加工方法。1. A glass rod having a locally small diameter portion is fixed between both chucks of a glass lathe, and while heating the small diameter portion, at least one of the chucks is moved to reduce the distance between the two chucks. A method for processing a glass rod, comprising increasing the diameter of a small diameter portion to a predetermined diameter and processing the glass rod into a glass rod having a uniform diameter.
間に固定し、該ガラスロッドに沿って外径測定器を走査
させて所定の径との比較演算を行い、局所的細径部とそ
の位置を検出し、検出された細径部の位置に加熱手段を
移動させて細径部を加熱し軟化させ、少なくとも一方の
チャックを移動させて細径部が所定の径となるまで両チ
ャック間距離を短縮することにより、細径部を増径して
径の一様なガラスロッドに加工することを特徴とするガ
ラスロッドの加工方法。2. A glass rod is fixed between both chucks of a glass lathe, an outer diameter measuring device is scanned along the glass rod, a comparison operation with a predetermined diameter is performed, and a local small diameter portion and its position are determined. Is detected, the heating means is moved to the position of the detected small-diameter portion to heat and soften the small-diameter portion, and at least one of the chucks is moved until the small-diameter portion has a predetermined diameter. A method of processing a glass rod, characterized in that the diameter of the small-diameter portion is increased to reduce the diameter of the glass rod to a glass rod having a uniform diameter.
ッドを回転させつつガス火炎で加熱し、細径部を増径す
る請求項１又は２に記載のガラスロッドの加工方法。3. The method for processing a glass rod according to claim 1, wherein the glass rod fixed between the chucks is heated by a gas flame while rotating the glass rod to increase the diameter of the small diameter portion.
径部に押圧力を加えるためのチャックの移動速度及び加
熱手段の移動速度を、ガラスロッドの増径すべき加熱箇
所の径を測定して得られた実測径と、予め設定された設
定径との比較演算値に基づき制御する請求項１乃至３に
記載のガラスロッドの加工方法。4. The moving speed of the chuck and the moving speed of the heating means for applying a pressing force to the small diameter portion of the glass rod by moving the chuck, and measuring the diameter of the heated portion of the glass rod to be increased in diameter. 4. The glass rod processing method according to claim 1, wherein the control is performed based on a comparison operation value between the obtained measured diameter and a preset diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6500299A JP3105206B2 (en) | 1999-03-11 | 1999-03-11 | Processing method of glass rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6500299A JP3105206B2 (en) | 1999-03-11 | 1999-03-11 | Processing method of glass rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000256024A true JP2000256024A (en) | 2000-09-19 |
| JP3105206B2 JP3105206B2 (en) | 2000-10-30 |
Family
ID=13274372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6500299A Expired - Fee Related JP3105206B2 (en) | 1999-03-11 | 1999-03-11 | Processing method of glass rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3105206B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2839063A1 (en) * | 2002-04-29 | 2003-10-31 | Cit Alcatel | PROCESS FOR PRODUCING OPTICAL FIBER PREFORMS |
| EP1544173A1 (en) * | 2003-12-11 | 2005-06-22 | FITEL USA CORPORATION (a Delaware Corporation) | Glass preform for an optical fibre and method and apparatus for its manufacture |
| JP2006255813A (en) * | 2005-03-16 | 2006-09-28 | Nissan Motor Co Ltd | Device and method for machining fine recessed part |
-
1999
- 1999-03-11 JP JP6500299A patent/JP3105206B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2839063A1 (en) * | 2002-04-29 | 2003-10-31 | Cit Alcatel | PROCESS FOR PRODUCING OPTICAL FIBER PREFORMS |
| EP1359127A1 (en) * | 2002-04-29 | 2003-11-05 | Alcatel | Process for producing optical fibre preforms |
| EP1544173A1 (en) * | 2003-12-11 | 2005-06-22 | FITEL USA CORPORATION (a Delaware Corporation) | Glass preform for an optical fibre and method and apparatus for its manufacture |
| JP2006255813A (en) * | 2005-03-16 | 2006-09-28 | Nissan Motor Co Ltd | Device and method for machining fine recessed part |
| JP4737710B2 (en) * | 2005-03-16 | 2011-08-03 | 日産自動車株式会社 | Fine recess processing apparatus and fine recess processing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3105206B2 (en) | 2000-10-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3105206B2 (en) | Processing method of glass rod | |
| JP3777746B2 (en) | Drawing method of glass base material | |
| JP3430038B2 (en) | End drawing method of preform for optical fiber and apparatus used for the method | |
| JP3812357B2 (en) | Optical fiber preform stretching method and stretching apparatus | |
| JP3296689B2 (en) | Glass rod eccentricity measurement and display device | |
| JPS62226831A (en) | Method for automatically regulating outside diameter of base material for optical fiber | |
| US7886561B2 (en) | Method for drawing glass parent material and drawing machine for use therein | |
| JP2000247672A (en) | Method for processing optical fiber preform and processing apparatus therefor | |
| JPH0441156Y2 (en) | ||
| JPH0253376B2 (en) | ||
| JP2938647B2 (en) | Glass rod stretching control method | |
| JP3151387B2 (en) | Manufacturing method of optical fiber preform | |
| JP3437484B2 (en) | Method and apparatus for manufacturing optical fiber preform | |
| JP4258610B2 (en) | Drawing method of glass base material | |
| JP6136554B2 (en) | Glass base material stretching apparatus and glass base material manufacturing method | |
| JP3151386B2 (en) | Manufacturing method of optical fiber preform | |
| JPH05319845A (en) | Method for working optical fiber preform | |
| JPS60260429A (en) | Forming device of parent material for optical fiber | |
| JPS61295250A (en) | Drawing method for parent material for optical fiber | |
| JP2000143270A (en) | Stretching method for glass preform | |
| JPH0459252B2 (en) | ||
| JP2022034610A (en) | Optical fiber glass preform and method for drawing the same | |
| JP2000302469A (en) | Method and apparatus for drawing glass preform | |
| JPH0328138A (en) | Production of glass capillary | |
| JP2001031439A (en) | Correction of bending in pre-form rod for optical fiber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100901 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100901 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110901 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120901 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130901 Year of fee payment: 13 |
|
| LAPS | Cancellation because of no payment of annual fees |