JPS6355135A - Production of optical fiber preform - Google Patents
Production of optical fiber preformInfo
- Publication number
- JPS6355135A JPS6355135A JP19898286A JP19898286A JPS6355135A JP S6355135 A JPS6355135 A JP S6355135A JP 19898286 A JP19898286 A JP 19898286A JP 19898286 A JP19898286 A JP 19898286A JP S6355135 A JPS6355135 A JP S6355135A
- Authority
- JP
- Japan
- Prior art keywords
- raw material
- gas
- flow rate
- glass
- layer
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 239000013307 optical fiber Substances 0.000 title claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 56
- 239000011521 glass Substances 0.000 claims abstract description 24
- 239000000567 combustion gas Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000005373 porous glass Substances 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 19
- 239000010419 fine particle Substances 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 238000006460 hydrolysis reaction Methods 0.000 claims description 5
- 239000007858 starting material Substances 0.000 claims description 4
- 230000007062 hydrolysis Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 19
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000008021 deposition Effects 0.000 abstract description 2
- 229910003910 SiCl4 Inorganic materials 0.000 abstract 2
- FDNAPBUWERUEDA-UHFFFAOYSA-N silicon tetrachloride Chemical compound Cl[Si](Cl)(Cl)Cl FDNAPBUWERUEDA-UHFFFAOYSA-N 0.000 abstract 2
- 230000003301 hydrolyzing effect Effects 0.000 abstract 1
- 238000005245 sintering Methods 0.000 abstract 1
- 239000012808 vapor phase Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 11
- 239000000835 fiber Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 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
- C03B37/014—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
- C03B2207/04—Multi-nested ports
- C03B2207/06—Concentric circular ports
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/20—Specific substances in specified ports, e.g. all gas flows specified
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/36—Fuel or oxidant details, e.g. flow rate, flow rate ratio, fuel additives
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/70—Control measures
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は光フアイバ用母材の製造方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a base material for optical fiber.
一般に火炎加水分解反応を用いた元ファイノく用母材の
製造においては、ノクーナから燃焼ガス、ガラス原料等
を噴出し、酸水素火炎中において上記ガラス原料の加水
分解反応により生じ次ガラス微粒子を、回転する出発材
又は心棒の外周に堆積させ多孔質ガラス体を得る方法が
用いられている。この方法においては燃料ガスの流量が
原料収率を大きく支配することが分っている。In general, in the production of base materials for base metals using flame hydrolysis reactions, combustion gas, glass raw materials, etc. are ejected from a nocuna, and the glass fine particles produced by the hydrolysis reaction of the glass raw materials in an oxyhydrogen flame are Methods have been used to obtain porous glass bodies by depositing them on the outer periphery of a rotating starting material or mandrel. It has been found that in this method, the flow rate of the fuel gas greatly controls the raw material yield.
ここでいう原料収率とは、原料投入量に対する堆積した
ガラス微粒子の割合〔母材型ｉｔ／原料重量×１００（
イ）〕をいう。これは、燃燃ガスの流量条件が火炎の温
度、流速を支配しており、このために該流量条件によっ
て火炎内で生成されるガラス微粒子の粒径及び数量が決
定され、さらに母材表面でのガラス微粒子の堆積効率を
決定しているためである。The raw material yield here means the ratio of deposited glass particles to the amount of raw material input [base material type it/raw material weight x 100 (
b)]. This is because the flow rate conditions of the combustion gas control the temperature and flow velocity of the flame, and for this reason, the particle size and number of glass particles generated within the flame are determined by the flow rate conditions, and furthermore, the particle size and number of glass particles generated in the flame are determined by the flow rate conditions. This is because it determines the deposition efficiency of glass particles.
従来のこの種の製造方法は、原料投入量に対し燃焼ガス
流量をどのくらいにしたら原料収率が最良になるか不明
な点が多かった。そのため、原料流量を多くした場合な
ど、原料収率を悪化させることが多々あり問題となって
いた。In conventional manufacturing methods of this kind, there were many points in which it was unclear how much the combustion gas flow rate should be in relation to the amount of raw material input to achieve the best raw material yield. Therefore, when the raw material flow rate is increased, the raw material yield often deteriorates, which has been a problem.
原料収率の悪化は、それ自身が問題であるに加え、反応
容器内金堆積しなかったガラス微粒子が浮遊し、製造し
た母材表面に付着する等の悪影響を与える。したがって
、原料流量に対する燃焼ガス流量の最適条件が存在しそ
れを見出せるならば、原料流量を変えるたびに、最適条
件の探索の手間かはふけ、この種の製造技術の向上に非
常に効果が大きい。The deterioration of the raw material yield is not only a problem in itself, but also has an adverse effect, such as glass fine particles that are not deposited with gold in the reaction vessel, floating and adhering to the surface of the manufactured base material. Therefore, if an optimal condition for the combustion gas flow rate relative to the raw material flow rate exists and can be found, it would save the time and effort of searching for the optimal condition every time the raw material flow rate is changed, and it would be very effective in improving this type of manufacturing technology. .
本発明の目的は、この原料流量に対する燃焼ガス流量の
最適条件という従来検討されていなかつ次製造条件を見
出し、原料収率を向上して元ファイバ用母材を製造する
方法を提供するにある。An object of the present invention is to find the next manufacturing condition, which has not been considered in the past, which is the optimum condition of the combustion gas flow rate with respect to the raw material flow rate, and to provide a method for manufacturing a base material for an original fiber while improving the raw material yield.
本発明者らは鋭意研究の結果、火炎面を複数個形成しう
る多重管バーナを用いた母材の製造方法において、原料
と混合したＨ２、あるいは原料ボートと隣接するボート
に流すＨ２の流量は原料収率に大きな影響を与えている
という新たな知見を得、原料を流す層と該層に隣接する
ボートよジ流すＨ，ガス流量に着目し、そのＨ２ガス流
量が原料流量に対し、１〜４倍に設定した製造条件にお
いて、母材を合成すれば高い原料収率が得られることを
見い出し、本発明に到達した。As a result of intensive research, the present inventors found that in a method for manufacturing a base material using a multi-tube burner that can form multiple flame surfaces, the flow rate of H2 mixed with raw materials or flowing into a boat adjacent to a raw material boat is We obtained new knowledge that it has a large effect on raw material yield, and focused on the flow rate of H2 gas flowing through the layer where the raw material flows and the boat adjacent to the layer, and found that the H2 gas flow rate is 1 We have discovered that a high raw material yield can be obtained by synthesizing the base material under manufacturing conditions set to ~4 times as high, and have arrived at the present invention.
本発明は気体のガラス原料を燃焼バーナから噴出させて
火炎加水分解し、これにより生成するガラス微粒子を回
転する出発材又は心棒の外周に堆積させて回転軸方向に
成長させ、多孔質ガラス母材を製造する方法において、
火炎面を複数個形成する多重管バーナの原料を流す膚と
該層に隣接する層とに流す燃焼ガス流量を、原料流量の
１〜４倍とすることを特徴とする元ファイバ用母材の製
造方法である。In the present invention, a gaseous glass raw material is ejected from a combustion burner and subjected to flame hydrolysis, and the resulting glass fine particles are deposited on the outer periphery of a rotating starting material or mandrel and grown in the direction of the rotation axis to form a porous glass base material. In the method of manufacturing,
A base material for an original fiber, characterized in that the flow rate of combustion gas flowing through the layer through which the raw material flows and the layer adjacent to the layer of the multi-tube burner forming a plurality of flame surfaces is 1 to 4 times the flow rate of the raw material. This is the manufacturing method.
以下図面を参照して説明する。第１図は元ファイバ用ガ
ラス母材の製造装置を模式的に示す図であって、反応容
器１内部の回転及び上下動可能な出発材又は心棒２の外
周に、燃焼バーナ４から気体のガラス原料、燃焼ガス、
助燃ガス、不活性ガス等を噴出させることにより上記ガ
ラス原料を火炎加水分解して生成したガラス微粒子を堆
積させ、回転軸方向に成長させて多孔質ガラス母材３を
得る。This will be explained below with reference to the drawings. FIG. 1 is a diagram schematically showing an apparatus for manufacturing a glass preform for original fibers, in which gaseous glass is applied from a combustion burner 4 to the outer periphery of a rotatable and vertically movable starting material or mandrel 2 inside a reaction vessel 1. raw materials, combustion gas,
Glass fine particles produced by flame hydrolysis of the glass raw material are deposited by blowing out a combustion assisting gas, an inert gas, etc., and grown in the direction of the rotation axis to obtain a porous glass base material 3.
本発明者らは第１図の燃焼バーナ４として多重管バーナ
、特に中心部のガラス原料流のまわフに二重に火炎を形
成する二重火炎バーナを用いてガラス母材ｋｍ造した。The present inventors used a multi-tube burner as the combustion burner 4 shown in FIG. 1, particularly a double flame burner that forms double flames around the flask of the frit flow in the center, to produce a glass base material.
この時のガス流量は、中心から項次第１ボートガラス原
料５ｉＣ４３１／分、第２ボートＨ，１〜３０ｔ／分の
間で変動、第３ボートＡｒ５ｔ／分、第４ボート０゜１
５ｔ／分（以上第２〜４ボートは内側の火炎用ガスであ
る）、外側火炎としてＨ！４０１／分、Ａｒ４ｔ／分、
０２５１７分であった。このように内側火炎で特に原料
と隣接するボートのＨｚＲ，にのみを１〜３０ｔ／分の
範囲で変化させたところ、原料収率は第２図に示すよう
に変化した。The gas flow rate at this time varies from the center to 1st boat glass raw material 5iC431/min, 2nd boat H, fluctuates between 1 and 30t/min, 3rd boat Ar5t/min, 4th boat 0°1
5t/min (the above 2nd to 4th boats are the gas for the inner flame), H as the outer flame! 401/min, Ar4t/min,
It was 02517 minutes. In this way, when only the HzR of the inner flame, particularly of the boat adjacent to the raw material, was changed in the range of 1 to 30 t/min, the raw material yield changed as shown in FIG.
この現象をさらに詳しく調べるため、上記の条件により
合成されるガラス微粒子の大きさを比表面積測定法（Ｂ
、Ｅ、Ｔ法）によｐ測定したところ％ Ｈ１流量との間
に第３図のグラフに示すような関係のあることがわかっ
た。すなわち原料を流す第１ボートに隣接する第２ボー
トのＨ２流量は、火炎内で合成されるガラス微粒子の粒
径を支配しており、大きな粒径が得られるＨ−流量にお
いては、母材製造の原料収率が高くなっていることが分
った。In order to investigate this phenomenon in more detail, we measured the size of glass particles synthesized under the above conditions using the specific surface area measurement method (B
, E, T method), it was found that there was a relationship between the %H1 flow rate and the flow rate as shown in the graph of FIG. In other words, the H2 flow rate of the second boat adjacent to the first boat through which the raw materials flow controls the particle size of the glass fine particles synthesized in the flame, and at the H2 flow rate where a large particle size is obtained, it is difficult to manufacture the base material. It was found that the raw material yield was high.
本発明者らはさらに種々の流量条件により検討を重ねた
結果、原料流量に対しＨ，ガス流量が１〜４倍の場合に
原料収率が高収率となることを見出したのである。As a result of further studies under various flow rate conditions, the present inventors found that the raw material yield becomes high when the H and gas flow rate is 1 to 4 times the raw material flow rate.
これは、Ｈ２ガスが火炎内で合成されるガラス微粒子の
大きさを支配しているからで、同様のことは、山ガス全
原料と混合した場合についても言えることがわかった。This is because H2 gas controls the size of the glass particles synthesized in the flame, and it was found that the same thing can be said when mixed with all raw materials of mountain gas.
すなわち原料を流す層と該層に隣接する層に流す燃焼ガ
スの合計流量が原料流量に対し１〜４倍の場合に高い原
料収率が得られる。That is, a high raw material yield can be obtained when the total flow rate of the combustion gas flowing through the layer through which the raw material flows and the layer adjacent to the layer is 1 to 4 times the flow rate of the raw material.
又、以上の説明は本発明の燃料ガスとしてＨ２を用いた
例について行ったが、Ｈ！の他に例えばメタン、プロパ
ン等の炭化水素を燃料としてもよい。Furthermore, although the above explanation was given for an example using H2 as the fuel gas of the present invention, H! In addition, hydrocarbons such as methane and propane may be used as fuel.
実施例１
従来、多重管バーナのガス流量条件を中心から順次第１
ボート５ｉＣ４： ３ｔ／分、第２ボー）！（１： １
５１７分、第３ボートＡｒ：３ｔ／分、第４ボートｏ２
：１５ｔ／分、にして、また以上による火炎の外側にＨ
，４０１／分、Ａｒ４ｔ／分、０１５０１７分の流量条
件の火炎を形成して母材ｔ−ｇ造していたところ、原料
の平均収率は５０チ前後であった。上記の製造条件にお
いて、本発明により、第２ボー）Ｈｚ流量を原料流量の
３倍の９１７分にして母材全製造したところ原料収率が
６７％と１７チも向上した。しかも、この製造条件にお
いても、母材の回転軸方向の成長も安定しておフ、母材
割れ等の不良も発生しなかった。Example 1 Conventionally, the gas flow conditions of a multi-tube burner were set to 1 in order from the center.
Boat 5iC4: 3t/min, 2nd boat)! (1: 1
517 minutes, 3rd boat Ar: 3t/min, 4th boat o2
: 15t/min, and H on the outside of the flame due to
, 401/min, Ar 4 t/min, and 0.15017 min of flow rate to produce the base material tg, and the average yield of the raw material was around 50 t/min. Under the above manufacturing conditions, according to the present invention, when the entire base material was manufactured by setting the second baud)Hz flow rate to 917 minutes, which is three times the raw material flow rate, the raw material yield was improved by 17 cm to 67%. Moreover, even under these manufacturing conditions, the growth of the base material in the direction of the rotation axis was stable, and defects such as base material cracking did not occur.
実施例２
第１ボート５ｉｃｋ ： ４１７分、第２ボートＨ２、
第３ボートＡｒ：３ｔ／分、第４ボートＯ，： １５ｔ
／分の条件に固定し、第２ボートＨ８の流量を２〜２０
ｔ／分に変化させてみ友。原料収率は第２ボートＨ２流
量が１２ｔ／分、すなわち、原料流量の３倍の時に最大
で６４俤であった。Example 2 1st boat 5ick: 417 minutes, 2nd boat H2,
3rd boat Ar: 3t/min, 4th boat O: 15t
/min, and the flow rate of the second boat H8 is set to 2 to 20 min.
Please change it to t/min. The maximum raw material yield was 64 tons when the second boat H2 flow rate was 12 t/min, that is, three times the raw material flow rate.
以上の実施例は２重火炎バーナにおける原料層と隣接す
る層に流すＨ２流量に関するものであるが、これは２重
火炎に限らず、火炎を複数個形成するバーナについて同
様のことが言えることも研究の結果判明した。The above examples relate to the H2 flow rate flowing into the raw material layer and the adjacent layer in a double flame burner, but this is not limited to double flame burners, and the same can be said for burners that form multiple flames. This was discovered as a result of research.
以上説明したように、本発明は多重管バーナの場合、原
料と隣接するＨ２ガスの流量を原料流量に対し、１〜４
倍に設定することにより、高収率で母材を製造すること
ができる。As explained above, in the case of a multi-tube burner, the present invention allows the flow rate of H2 gas adjacent to the raw material to be 1 to 4 times the flow rate of the raw material.
By setting the amount to double, the base material can be manufactured with high yield.
第１図は本発明の元ファイバ母材の製造方法の一実施態
様を説明する概略断面図である。
第２図＃：を原料を流す層に隣接する層におけるＨ２
流を変化と原料収率の関係を示すグラフ、第３図は同
様に隣接層でのＨｚＲ，量変化とガラス微粒子粒径の関
係を示すグラフである。FIG. 1 is a schematic cross-sectional view illustrating one embodiment of the method for manufacturing a fiber preform of the present invention. Figure 2 #: H2 in the layer adjacent to the layer through which the raw material flows
FIG. 3 is a graph showing the relationship between the flow rate and the raw material yield, and FIG. 3 is a graph showing the relationship between the HzR and amount changes in the adjacent layer and the glass particle size.
Claims (1)
炎加水分解し、これにより生成するガラス微粒子を回転
する出発材又は心棒の外周に堆積させて回転軸方向に成
長させ、多孔質ガラス母材を製造する方法において、火
炎面を複数個形成する多重管バーナの原料を流す層と該
層に隣接する層とに流す燃焼ガス流量を、原料流量の１
〜４倍とすることを特徴とする光ファイバ用母材の製造
方法。(1) A gaseous glass raw material is ejected from a combustion burner and subjected to flame hydrolysis, and the resulting glass fine particles are deposited on the outer periphery of a rotating starting material or mandrel and grown in the direction of the rotation axis to form a porous glass base material. In a method for manufacturing a multi-tube burner that forms a plurality of flame surfaces, the flow rate of combustion gas flowing through a layer through which the raw material flows and a layer adjacent to the layer is set to 1 of the flow rate of the raw material.
A method for manufacturing an optical fiber preform, characterized in that the base material is increased by ~4 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19898286A JPH0712954B2 (en) | 1986-08-27 | 1986-08-27 | Method for manufacturing base material for optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19898286A JPH0712954B2 (en) | 1986-08-27 | 1986-08-27 | Method for manufacturing base material for optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6355135A true JPS6355135A (en) | 1988-03-09 |
| JPH0712954B2 JPH0712954B2 (en) | 1995-02-15 |
Family
ID=16400148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19898286A Expired - Lifetime JPH0712954B2 (en) | 1986-08-27 | 1986-08-27 | Method for manufacturing base material for optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0712954B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6725690B2 (en) | 2000-09-14 | 2004-04-27 | Sumitomo Electric Industries, Ltd. | Burner for synthesizing glass particles and method for producing porous glass body |
| WO2017188334A1 (en) * | 2016-04-26 | 2017-11-02 | 住友電気工業株式会社 | Method of synthesizing glass microparticles |
-
1986
- 1986-08-27 JP JP19898286A patent/JPH0712954B2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6725690B2 (en) | 2000-09-14 | 2004-04-27 | Sumitomo Electric Industries, Ltd. | Burner for synthesizing glass particles and method for producing porous glass body |
| US7143608B2 (en) | 2000-09-14 | 2006-12-05 | Sumitomo Electric Industries, Ltd. | Burner for synthesizing glass particles and method for producing porous glass body |
| WO2017188334A1 (en) * | 2016-04-26 | 2017-11-02 | 住友電気工業株式会社 | Method of synthesizing glass microparticles |
| CN109071296A (en) * | 2016-04-26 | 2018-12-21 | 住友电气工业株式会社 | The synthetic method of glass granules |
| KR20180136457A (en) * | 2016-04-26 | 2018-12-24 | 스미토모 덴키 고교 가부시키가이샤 | Method of synthesizing glass microparticles |
| JPWO2017188334A1 (en) * | 2016-04-26 | 2019-02-28 | 住友電気工業株式会社 | Method for synthesizing glass particles |
| CN109071296B (en) * | 2016-04-26 | 2021-07-30 | 住友电气工业株式会社 | Method for synthesizing glass microparticles |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0712954B2 (en) | 1995-02-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1233080A (en) | Method of fabricating optical fiber preforms | |
| RU2271341C2 (en) | Multi-tubular burner and method of producing glass blank | |
| JPS6126532A (en) | Production of base material for optical fiber | |
| JPS6355135A (en) | Production of optical fiber preform | |
| JP3567574B2 (en) | Burner for synthesis of porous glass base material | |
| JP2019064897A (en) | Method of manufacturing porous glass layered product for optical fiber | |
| JPS60260433A (en) | Manufacture of base material for optical fiber | |
| JP2751176B2 (en) | Manufacturing method of base material for optical fiber | |
| JP3188515B2 (en) | Burner for synthesis of silica fine particles | |
| US20020189298A1 (en) | Apparatus for manufacturing an optical fiber soot, and method for manufacturing an optical fiber soot using the same | |
| JPS6259063B2 (en) | ||
| JPH06219764A (en) | Production of perform for dispersed shift fiber | |
| JPS63123828A (en) | Production of porous preform for optical fiber | |
| JP2003212560A (en) | Method for manufacturing fine glass deposit | |
| JPS63107825A (en) | Production of synthetic quartz tube | |
| JPH04240125A (en) | Manufacture of optical fiber preform | |
| JPH0986948A (en) | Production of porous glass base material for optical fiber | |
| JPS63252937A (en) | Production of optical fiber preform | |
| JP2000063141A (en) | Production of porous glass preform for optical fiber | |
| JPH09301719A (en) | Focusing multiple burner for synthesis of glass fine particle | |
| JPH02120250A (en) | Production of deposited glass soot material | |
| JPH04243929A (en) | Production of matrix for optical fiber | |
| JPH01179737A (en) | Production of preform for optical fiber | |
| JPS63282137A (en) | Production of porous base material for quartz glass | |
| JPH02133331A (en) | Production of fine glass particle-deposited body |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |