JPH04331733A - Method and device for processing base material of optical fiber - Google Patents
Method and device for processing base material of optical fiberInfo
- Publication number
- JPH04331733A JPH04331733A JP12474391A JP12474391A JPH04331733A JP H04331733 A JPH04331733 A JP H04331733A JP 12474391 A JP12474391 A JP 12474391A JP 12474391 A JP12474391 A JP 12474391A JP H04331733 A JPH04331733 A JP H04331733A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- base material
- viscosity
- fiber preform
- fiber base
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000463 material Substances 0.000 title abstract description 30
- 238000005520 cutting process Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000005243 fluidization Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- 206010047571 Visual impairment Diseases 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 208000029257 vision disease Diseases 0.000 description 2
- 230000004393 visual impairment Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007524 flame polishing Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
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
- C03B37/01251—Reshaping the ends
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/47—Shaping the preform draw bulb before or during drawing
Landscapes
- Engineering & Computer Science (AREA)
- 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
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
き工程に送る前に行う前処理において、光ファイバ母材
の切り離しを最適タイミングで行う光ファイバ母材の加
工方法およびその加工装置に関するものである。[Field of Industrial Application] The present invention relates to a method for processing an optical fiber preform and a processing apparatus therefor, in which the optical fiber preform is separated at an optimal timing during pretreatment performed before sending the preform to a drawing process. It is something.
【０００２】0002
【従来の技術】従来、光ファイバの製造にあったては、
先ず、始めに光ファイバ母材を作り、この母材を線引き
し、細線化（ファイバ化）して製造している。この線引
きに際しては、その前処理として、ＶＡＤ法や外付け法
などにより得られた光ファイバ母材の一端を、切離し、
口出し加工し、火炎研磨などを行う必要があり、従来は
、例えば図４に示した如き装置系により行っている。[Prior Art] Conventionally, in the production of optical fibers,
First, an optical fiber base material is made, and this base material is drawn and thinned (fiberized) to manufacture it. In this drawing, as a pretreatment, one end of the optical fiber base material obtained by the VAD method or external attachment method is cut off.
It is necessary to perform edge processing, flame polishing, etc., and this has conventionally been carried out using, for example, an apparatus system as shown in FIG.
【０００３】例えば縦型のガラス製旋盤１の上下部のフ
レーム２，３間に各チャック４，５を介して、光ファイ
バ母材（石英ロッド）６を把持させ、当該光ファイバ母
材６を回転させつつ、旋盤１側のトラバース機構８によ
り上下動される酸水素バーナ７から、火炎を吹き付け、
光ファイバ母材６の下端付近を加熱して先端を切り離し
、口出し加工を行っている。For example, an optical fiber preform (quartz rod) 6 is gripped between the upper and lower frames 2 and 3 of a vertical glass lathe 1 via chucks 4 and 5, and the optical fiber preform 6 is While rotating, spray flame from the oxyhydrogen burner 7 that is moved up and down by the traverse mechanism 8 on the lathe 1 side,
The vicinity of the lower end of the optical fiber base material 6 is heated to cut off the tip and lead-out processing is performed.
【０００４】実際には、光ファイバ母材６の下端が加熱
により軟化したところで、例えば上記旋盤１の下部フレ
ーム３を矢印Ａ方向に押し下げて切り離し、同時に線引
き装置にセットできるように細い先端形状に口出し加工
している。この光ファイバ母材の切り離しの最適タイミ
ングは、上述したように母材の切離部を一定時間加熱し
、母材の中心部が流動化する温度（流動化温度）に達し
たときが最適であるわけであるが、従来、この流動化温
度は、作業者が母材表面の色や形状など見て、目視によ
り判断していた。In practice, once the lower end of the optical fiber preform 6 has been softened by heating, it is cut off by pushing down the lower frame 3 of the lathe 1 in the direction of arrow A, and at the same time it is cut into a thin tip shape so that it can be set in a drawing device. I'm processing the opening. As mentioned above, the optimal timing for cutting off the optical fiber base material is when the cut part of the base material is heated for a certain period of time and the temperature at which the center of the base material becomes fluidized (fluidization temperature) is reached. Conventionally, this fluidization temperature has been determined visually by an operator by observing the color and shape of the surface of the base material.
【０００５】[0005]
【発明が解決しようとする課題】このため、作業者には
、細心の注意と経験による微妙な熟練が必要とされ、さ
らにまた、各作業者の判断には個人差があるため、種々
の問題があった。例えば、加熱不足で、切り離しのタイ
ミングが速すぎる場合には、下部フレーム３を矢印Ａ方
向に押し下げも容易に切り離れず、その力が光ファイバ
母材の上部に掛かったりするため、上部の母材を支える
ダミーガラスが割れて母材自体が落下したり、あるいは
上部チャック２から抜け落ちたりする恐れがあった。[Problem to be Solved by the Invention] For this reason, workers are required to be extremely careful and have delicate skills based on experience, and furthermore, since there are individual differences in the judgment of each worker, various problems arise. was there. For example, if the timing of disconnection is too fast due to insufficient heating, the lower frame 3 cannot be easily separated by pushing it down in the direction of arrow A, and the force is applied to the upper part of the optical fiber base material. There was a risk that the dummy glass supporting the material would break and the base material itself would fall or fall off from the upper chuck 2.
【０００６】かと言って、加熱時間を長くすると切り離
しはスムーズに行くものの、切離時間が長くなって、作
業能率が低下するという問題があった。さらに、この切
り離しのタイミング判断を困難にさせるものとして、こ
の判断環境は、酸水素バーナ７の近傍で、しかも、高温
、高輝度を伴う環境であるため、光ファイバ母材の表面
色や形状などの微妙な判断を、作業者の目視で行うには
不向きな環境であることも挙げられる。もちろん、目視
によっていたのでは、作業者の視覚障害などの問題も生
じる。On the other hand, if the heating time is increased, the separation becomes smoother, but there is a problem in that the separation time becomes longer and the work efficiency decreases. Furthermore, what makes it difficult to judge the timing of disconnection is that the judgment environment is near the oxyhydrogen burner 7 and is an environment with high temperature and high brightness, so the surface color and shape of the optical fiber base material Another reason is that the environment is not suitable for workers to make delicate judgments visually. Of course, visual inspection may cause problems such as visual impairment for the worker.
【０００７】本発明は、このように従来の実情に鑑みて
なされたもので、その特徴とする点は、母材の中心部が
流動化する温度（流動化温度）における粘度に着目し、
この粘度の検出により、最適切離しタイミングを求める
、光ファイバ母材の加工方法およびその加工装置を提供
することを目的とする。[0007] The present invention was made in view of the conventional situation, and its characteristics are that it focuses on the viscosity at the temperature at which the center of the base material becomes fluidized (fluidization temperature),
It is an object of the present invention to provide a method for processing an optical fiber base material and a processing apparatus therefor, which determines the optimal timing for separating by detecting this viscosity.
【０００８】[0008]
【課題を解決するための手段】かゝる本発明の光ファイ
バ母材の加工方法は、線引き工程前の光ファイバ母材の
両端を把持して、該光ファイバ母材の下端付近をバーナ
の火炎で加熱して先端を切り離し、口出し加工を行う工
程において、前記光ファイバ母材の粘度を検出し、切離
し最適粘度になったとき、当該光ファイバ母材を切り離
す加工方法にある。[Means for Solving the Problems] In the optical fiber preform processing method of the present invention, both ends of the optical fiber preform before the drawing process are held, and the vicinity of the lower end of the optical fiber preform is placed in a burner. In the process of heating with flame to cut off the tip and lead-out processing, the viscosity of the optical fiber base material is detected, and when the viscosity reaches the optimum viscosity, the optical fiber base material is cut off.
【０００９】また、本発明の光ファイバ母材の加工装置
は、線引き工程前の光ファイバ母材の両端を把持する旋
盤の両チャックに、それぞれ当該チャックの回転速度を
検知する検出器を設けて粘度センサとし、前記光ファイ
バ母材の下端付近のバーナによる加熱時における、前記
両検出器の速度差から前記光ファイバ母材の粘度を検出
し、切離し最適粘度を求める加工装置にある。Further, the optical fiber preform processing apparatus of the present invention includes detectors for detecting the rotational speed of each chuck on both chucks of the lathe that grips both ends of the optical fiber preform before the drawing process. The viscosity sensor is used in a processing device that detects the viscosity of the optical fiber preform from the speed difference between the two detectors during heating by a burner near the lower end of the optical fiber preform, and determines the optimum viscosity for cutting.
【００１０】0010
【作用】このように本発明では、両チャック回転の速度
差などを利用した粘度センサにより、母材粘度の検出が
でき、この検出粘度から、切離し最適粘度すなわち最適
切離しタイミングが求められる。また、これにより切り
離しの自動化などが可能となる。As described above, in the present invention, the viscosity of the base material can be detected using a viscosity sensor that utilizes the speed difference between the rotations of both chucks, and from this detected viscosity, the optimum viscosity for separation, that is, the optimum separation timing can be determined. This also makes it possible to automate separation.
【００１１】[0011]
【実施例】図１は本発明に係る光ファイバ母材の加工方
法を実施するための加工装置の一実施例を示したもので
ある。同図の装置も、上述した図４の装置系とほぼ同様
であるが、本装置では、光ファイバ母材（石英ロッド）
６の粘度を検出するため、両チャック４，５部分の回転
速度を検知する検出器Ｄ１ ，Ｄ２ からなる粘度セン
サが設けてある。上記検出器Ｄ１ ，Ｄ２ は、図２〜
図３に示した如くで、チャック４，５の回転軸４ａ，５
ａに連設され、当該回転軸４ａ，５ａと共に回転する回
転盤１１と、この回転盤１１の円周方向に設けた多数の
透孔１２・・・と、この透孔形成部が通過される凹み部
の対向する部分に発光素子１４ａと受光素子１４ｂが内
蔵されたコ字型ブロック１３からなる。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a processing apparatus for carrying out the method of processing an optical fiber preform according to the present invention. The apparatus shown in the figure is also almost the same as the apparatus system shown in Fig. 4 described above, but in this apparatus, the optical fiber base material (quartz rod)
In order to detect the viscosity of the chuck 6, a viscosity sensor consisting of detectors D1 and D2 that detect the rotational speed of both the chucks 4 and 5 is provided. The above detectors D1 and D2 are shown in FIGS.
As shown in FIG.
A rotary disk 11 that is connected to the rotary disk 11 and rotates together with the rotating shafts 4a and 5a, a large number of through holes 12 provided in the circumferential direction of the rotary disk 11, and the through hole forming portion are passed through. It consists of a U-shaped block 13 in which a light emitting element 14a and a light receiving element 14b are housed in opposing parts of a recessed part.
【００１２】そして、これらの検出器Ｄ１ ，Ｄ２ で
は、チャック４，５の回転軸４ａ，５ａの回転、すなわ
ち回転盤１１の回転速度により、回転盤１１の透孔１２
・・・を通過する発光素子１４ａからの通過光量が変化
するため、その透過光量からチャック４，５の回転速度
（回転角速度）が求められるようになっている。In these detectors D1 and D2, the rotation of the rotating shafts 4a and 5a of the chucks 4 and 5, that is, the rotational speed of the rotary disk 11, causes the through hole 12 of the rotary disk 11 to be
Since the amount of light passing from the light emitting element 14a passing through changes, the rotational speed (rotational angular velocity) of the chucks 4 and 5 can be determined from the amount of transmitted light.
【００１３】一方、この旋盤１では、いずれのチャック
４，５も回転自在に支持され、その回転は、例えば図１
に示したように、外部のモータなどの駆動源１５を上部
のチャック４に関連付け、このチャック４の回転により
全体の回転が得られるようになっている。On the other hand, in this lathe 1, both chucks 4 and 5 are rotatably supported, and their rotation is, for example, as shown in FIG.
As shown in FIG. 2, a drive source 15 such as an external motor is associated with the upper chuck 4, so that rotation of the chuck 4 provides rotation of the entire body.
【００１４】また、この旋盤１による、光ファイバ母材
６の切離し時には、チャック４の回転により、光ファイ
バ母材６の全体を回転させると共に、トラバース機構８
により上下動される酸水素バーナ７によって、光ファイ
バ母材６の下端切離部を加熱する。この加熱により、光
ファイバ母材６の下端が軟化し、切り離しの最適タイミ
ングに至ったところで、下部フレーム３を矢印Ａ方向に
押し下げて切り離し、同時に線引き装置にセットできる
ように細い先端形状に口出し加工するわけであるが、本
発明では、この光ファイバ母材６の切り離しの最適タイ
ミングを、次のようにして求める。Furthermore, when cutting the optical fiber preform 6 using the lathe 1, the entire optical fiber preform 6 is rotated by the rotation of the chuck 4, and the traverse mechanism 8 is rotated.
The lower end cut portion of the optical fiber preform 6 is heated by the oxyhydrogen burner 7 which is moved up and down by the oxyhydrogen burner 7 . Due to this heating, the lower end of the optical fiber base material 6 is softened, and when the optimum timing for cutting is reached, the lower frame 3 is pushed down in the direction of arrow A to be cut, and at the same time, the tip is formed into a thin shape so that it can be set in a drawing device. However, in the present invention, the optimum timing for cutting off the optical fiber preform 6 is determined as follows.
【００１５】つまり、光ファイバ母材６の下端切離部が
加熱により軟化し、切り離しに最適な温度（流動化温度
）まで達したときには、当然、当該切離部の粘度は、当
初の粘度より低下し、ある値に達することが、考えられ
る。したがって、上部のチャック４を、例えば一定の速
度で回転していても、切離部粘度の低下により、下部の
チャック５部分では、その回転が少々遅れるという、ず
れが生じることになる。このずれは、上記検出器Ｄ１
による上部のチャック４の回転速度と、検出器Ｄ２ に
よる下部のチャック５の回転速度との差として検出する
ことができ、この回転差の検出から粘度が求められる。In other words, when the lower end cut portion of the optical fiber preform 6 is softened by heating and reaches the optimal temperature for cutting (fluidization temperature), the viscosity of the cut portion is naturally lower than the initial viscosity. It is conceivable that it decreases and reaches a certain value. Therefore, even if the upper chuck 4 is rotated, for example, at a constant speed, the rotation of the lower chuck 5 portion will be slightly delayed due to the decrease in the viscosity of the cutting portion, resulting in a deviation. This deviation is caused by the above detector D1
It can be detected as the difference between the rotational speed of the upper chuck 4 by the detector D2 and the rotational speed of the lower chuck 5 by the detector D2, and the viscosity can be determined from the detection of this rotational difference.
【００１６】このため、ある同種の光ファイバ母材６に
おいて、予め切り離しに最適な温度（流動化温度）に対
応した切離部の粘度を求め、これに対応した上記検出器
Ｄ１ と検出器Ｄ２ との回転差を求めておけば、実際
の運転において、この回転差が出現したときが、切り離
しの最適時であり、このとき、自動的にあるいは手動に
より切り離しを行えばよい。For this reason, in a certain kind of optical fiber preform 6, the viscosity of the cutting part corresponding to the optimum temperature for cutting (fluidization temperature) is determined in advance, and the detector D1 and the detector D2 corresponding to the viscosity are determined in advance. If the rotational difference between the two and the two rotational speeds is determined in advance, the optimum time for disconnection is when this rotational difference appears during actual operation, and at this time the disconnection can be performed automatically or manually.
【００１７】なお、上記各実施例では、縦型のガラス製
旋盤１を使用した場合であったが、本発明は、これに限
定されず、横型のガラス製旋盤を用いる場合にも応用で
きる。また、検出器Ｄ１ と検出器Ｄ２ の構造は、上
記実施例の場合に限定されず、チャック４，５の回転軸
４ａ，５ａの回転速度を求めるものであれば、すべて適
用可能である。Although each of the above embodiments uses a vertical glass lathe 1, the present invention is not limited thereto, and can also be applied to a horizontal glass lathe. Further, the structures of the detector D1 and the detector D2 are not limited to those in the above embodiments, and any structure can be applied as long as the rotational speed of the rotating shafts 4a, 5a of the chucks 4, 5 is determined.
【００１８】[0018]
【発明の効果】以上の説明から明らかなように本発明に
係る光ファイバ母材の加工方法およびその加工装置によ
れば、次のような優れた効果が得られる。
（１）線引き工程前の前処理において、光ファイバ母材
の最適切り離し粘度を検出する粘度センサを設置してあ
るため、切り離しの最適タイミングが自動的に求められ
る。したがって、作業者の負担が大幅に軽減され、最適
タイミングの判断ミスの発生は皆無となり、また、視覚
への悪影響、視覚障害などの問題は根本的に解決される
。
（２）また、粘度センサからの検出粘度情報を利用して
、下部フレームの自動押し下げや、トラバース機構と酸
水素バーナなどの制御を行えば、自動切離しと同時に、
自動口出し加工も簡単にでき、大幅な省力化が図れる。
（３）もちろん、これらの自動化により、作業環境の改
善も図ることができる。
（４）さらに、粘度の検知において、旋盤の両チャック
の回転速度差から求める場合には、簡単な構成で行うこ
とが可能である。As is clear from the above description, according to the optical fiber preform processing method and processing apparatus of the present invention, the following excellent effects can be obtained. (1) In the pretreatment before the drawing process, a viscosity sensor is installed to detect the optimum cutting viscosity of the optical fiber preform, so the optimum cutting timing can be automatically determined. Therefore, the burden on the operator is greatly reduced, errors in determining the optimal timing are completely eliminated, and problems such as adverse effects on vision and visual impairment are fundamentally solved. (2) In addition, if the viscosity information detected from the viscosity sensor is used to automatically push down the lower frame and control the traverse mechanism and oxyhydrogen burner, automatic disconnection can be performed at the same time.
Automatic lead-out processing is also easy, resulting in significant labor savings. (3) Of course, these automations can also improve the work environment. (4) Furthermore, when detecting viscosity based on the rotational speed difference between both chucks of a lathe, it is possible to use a simple configuration.
【図１】本発明に係る光ファイバ母材の加工方法を実施
するための加工装置の一実施例を示した概略説明図であ
る。FIG. 1 is a schematic explanatory diagram showing an embodiment of a processing apparatus for carrying out a method for processing an optical fiber preform according to the present invention.
【図２】図１の加工装置で用いるチャックの回転速度を
検出する検出器の概略説明図である。FIG. 2 is a schematic explanatory diagram of a detector that detects the rotational speed of a chuck used in the processing apparatus of FIG. 1;
【図３】図２の検出器の回転盤を示した平面図である。FIG. 3 is a plan view showing a rotary disk of the detector in FIG. 2;
【図４】従来の光ファイバ母材の加工方法を実施するた
めの装置系を示した概略説明図である。FIG. 4 is a schematic explanatory diagram showing an apparatus system for carrying out a conventional optical fiber preform processing method.
１ 旋盤 ６ 光ファイバ母材 ７ 酸水素バーナ ８ トラバース機構 １１ 回転盤 １２ 透孔 １３ コ字型ブロック １４ａ 発光素子 １４ｂ 受光素子 １５ 駆動源 Ｄ１ 検出器 Ｄ２ 検出器 1 Lathe 6 Optical fiber base material 7 Oxygen hydrogen burner 8 Traverse mechanism 11 Rotating disk 12 Through hole 13 U-shaped block 14a Light emitting element 14b Photo receiving element 15 Drive source D1 Detector D2 Detector
Claims (2)
を把持して、該光ファイバ母材の下端付近をバーナの火
炎で加熱して先端を切り離し、口出し加工を行う工程に
おいて、前記光ファイバ母材の粘度を検出し、切離し最
適粘度になったとき、当該光ファイバ母材を切り離すこ
とを特徴とする光ファイバ母材の加工方法。1. In the step of gripping both ends of the optical fiber preform before the drawing step, heating the vicinity of the lower end of the optical fiber preform with a flame of a burner to cut off the tip, and performing a lead-out process, the optical fiber is 1. A method for processing an optical fiber preform, comprising detecting the viscosity of the preform and cutting the optical fiber preform when the optimum viscosity is reached.
を把持する旋盤の両チャックに、それぞれ当該チャック
の回転速度を検知する検出器を設けて粘度センサとし、
前記光ファイバ母材の下端付近のバーナによる加熱時に
おける、前記両検出器の速度差から前記光ファイバ母材
の粘度を検出し、切離し最適粘度を求めることを特徴と
する光ファイバ母材の加工装置。2. Both chucks of a lathe that grip both ends of the optical fiber preform before the drawing process are provided with detectors for detecting the rotational speed of the chucks to serve as viscosity sensors,
Processing of the optical fiber preform characterized in that the viscosity of the optical fiber preform is detected from the speed difference between the two detectors during heating by a burner near the lower end of the optical fiber preform, and the optimum viscosity is determined by cutting the preform. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12474391A JPH04331733A (en) | 1991-04-27 | 1991-04-27 | Method and device for processing base material of optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12474391A JPH04331733A (en) | 1991-04-27 | 1991-04-27 | Method and device for processing base material of optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04331733A true JPH04331733A (en) | 1992-11-19 |
Family
ID=14893016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12474391A Pending JPH04331733A (en) | 1991-04-27 | 1991-04-27 | Method and device for processing base material of optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04331733A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5970750A (en) * | 1995-02-14 | 1999-10-26 | Alcatel Fibres Optiques | Method of making a fiber preform including a surface treatment to consolidate condensed material on the preform |
| US6779362B2 (en) | 1998-11-05 | 2004-08-24 | Shin-Etsu Chemical Co., Ltd. | Method of making an optical fiber preform where a second elongation is based on a mark on a glass rod |
-
1991
- 1991-04-27 JP JP12474391A patent/JPH04331733A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5970750A (en) * | 1995-02-14 | 1999-10-26 | Alcatel Fibres Optiques | Method of making a fiber preform including a surface treatment to consolidate condensed material on the preform |
| US6779362B2 (en) | 1998-11-05 | 2004-08-24 | Shin-Etsu Chemical Co., Ltd. | Method of making an optical fiber preform where a second elongation is based on a mark on a glass rod |
| US6848276B2 (en) | 1998-11-05 | 2005-02-01 | Shin-Etsu Chemical Co., Ltd. | Optical fiber manufacture method, preform manufacture method, and preform manufacture apparatus |
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