JPH0225848B2 - - Google Patents
Info
- Publication number
- JPH0225848B2 JPH0225848B2 JP60166603A JP16660385A JPH0225848B2 JP H0225848 B2 JPH0225848 B2 JP H0225848B2 JP 60166603 A JP60166603 A JP 60166603A JP 16660385 A JP16660385 A JP 16660385A JP H0225848 B2 JPH0225848 B2 JP H0225848B2
- Authority
- JP
- Japan
- Prior art keywords
- base material
- porous base
- glass
- exhaust pipe
- glass particles
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 claims description 42
- 239000011521 glass Substances 0.000 claims description 39
- 239000002245 particle Substances 0.000 claims description 29
- 239000010419 fine particle Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000013307 optical fiber Substances 0.000 claims description 7
- 238000000151 deposition Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 description 12
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000003786 synthesis reaction Methods 0.000 description 6
- 239000012808 vapor phase Substances 0.000 description 5
- 230000002194 synthesizing effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910003902 SiCl 4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011159 matrix material Substances 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]
- C03B37/0144—Means for after-treatment or catching of worked reactant gases
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)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、気相軸付法により光フアイバ用多
孔質母材を製造する方法に関するものであり、特
に外径が60mm以上の大型多孔質母材の製造に好適
なものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for producing a porous base material for optical fibers by a vapor phase mounting method, and in particular, relates to a method for producing a porous base material for optical fibers by a vapor phase mounting method, and particularly for producing a porous base material for optical fibers with an outer diameter of 60 mm or more. It is suitable for manufacturing base materials.
気相軸付法は、反応容器内に挿入した棒状基材
の下端に、ガラス微粒子合成用バーナによつて合
成した煤状のガラス微粒子を付着堆積させ、上記
棒状基材を回転させながらこれを上方に移動せし
めて軸方向にガラス微粒子の多孔質母材を連続的
に成長させるものである。
In the vapor phase axis attachment method, soot-like glass particles synthesized using a glass particle synthesis burner are attached and deposited on the lower end of a rod-shaped substrate inserted into a reaction vessel, and the soot-like glass particles are deposited while rotating the rod-shaped substrate. The porous base material of glass fine particles is continuously grown in the axial direction by moving the glass particles upward.
ところで、近年多孔質母材の大型化の傾向があ
り、複数本のガラス微粒子合成用バーナ、あるい
は大型のガラス微粒子合成用バーナを使用して、
外径が100mm程度のものが得られるようになつて
いる。 By the way, in recent years there has been a trend towards larger porous base materials, and it is now possible to use multiple burners for synthesizing glass fine particles or a large burner for synthesizing glass fine particles.
It is now possible to obtain products with an outer diameter of about 100 mm.
このような大型の多孔質母材を製造する場合、
反応容器内には、ガラス微粒子合成用バーナか
ら、多量のガラス微粒子が吹き込まれるので、多
孔質母材の形成にあずからない、すなわち、多孔
質母材に付着堆積しない余剰のガラス微粒子が反
応容器内に少なからず残る。この反応容器内に残
る余剰のガラス微粒子は、回転しながら上昇する
多孔質母材に伴なつて、多孔質母材の周囲を回転
しながら上昇し、多孔質母材の最外層に付着して
多孔質母材の軸方向における外径を変動させる。
これにより、多孔質母材の外層部における屈折率
分布に変動が生じ、光フアイバとしての特性が低
下する。さらに、余剰のガラス微粒子が多孔質母
材の周囲に付着した場合には多孔質母材の割れの
原因になるという問題もある。 When manufacturing such a large porous matrix,
Since a large amount of glass fine particles are blown into the reaction vessel from the glass fine particle synthesis burner, surplus glass particles that do not participate in the formation of the porous base material, that is, do not adhere to and accumulate on the porous base material, are blown into the reaction vessel. A considerable amount remains inside. The excess glass particles remaining in the reaction vessel rise while rotating around the porous base material, and adhere to the outermost layer of the porous base material. The outer diameter of the porous base material in the axial direction is varied.
This causes fluctuations in the refractive index distribution in the outer layer portion of the porous base material, degrading the properties as an optical fiber. Furthermore, if excess glass particles adhere to the periphery of the porous base material, there is a problem that it may cause cracks in the porous base material.
このような問題を避けるためには、反応容器に
排気管を設け、反応容器内の余剰のガラス微粒子
を吸引して強制排出すればよいが、吸引量が多い
と、反応容器内のガラス微粒子の流れに乱れが生
じ、却つて多孔質母材の成長速度等に弊害が生
じ、外径を変動させる。また、排気管を複数本設
置して余剰のガラス微粒子を吸引して強制排出す
る方法も考えられるが、この方法は各排気管の吸
引量のバランスをとるのが難しく反応容器内のガ
ラス微粒子の流れを乱す原因になる。 In order to avoid such problems, it is possible to install an exhaust pipe in the reaction vessel to suction and forcibly exhaust the excess glass particles in the reaction vessel, but if the amount of suction is large, the glass particles in the reaction vessel may Turbulence occurs in the flow, which adversely affects the growth rate of the porous base material and causes the outer diameter to fluctuate. Another option is to install multiple exhaust pipes to suck in and forcefully discharge excess glass particles, but this method is difficult to balance the amount of suction from each exhaust pipe, and the amount of glass particles in the reaction vessel is reduced. This will cause the flow to be disrupted.
そこで、この発明は、反応容器内の余剰のガラ
ス微粒子を、ガラス微粒子の流れを乱すことなく
排出して、多孔質母材の外径変動がない適正な屈
折率分布を有する多孔質母材を安定に製造する方
法を提供しようとするものである。 Therefore, the present invention aims to create a porous base material having an appropriate refractive index distribution without fluctuation in the outer diameter of the porous base material by discharging the excess glass particles in the reaction vessel without disturbing the flow of the glass particles. The aim is to provide a stable manufacturing method.
この発明は、気相軸付法により光フアイバ用多
孔質母材を製造する方法において、多孔質母材の
成長端の周囲近傍に、内周に吸気口を有するリン
グ状の排気管を設け、この排気管から余剰のガラ
ス微粒子を排出するようにしたものである。
This invention provides a method for manufacturing a porous preform for optical fibers by a vapor-phase axial method, in which a ring-shaped exhaust pipe having an inlet on the inner periphery is provided near the growth end of the porous preform; Excess glass particles are discharged from this exhaust pipe.
この方法においては、内周に吸気口を有するリ
ング状の排気管によつて、多孔質母材の成長端の
周囲近傍が吸引されるので、ガラス微粒子合成用
バーナによつて発生したガラス微粒子のうち、多
孔質母材の形成に使用されなかつた余剰のガラス
微粒子は、リング状の排気管の吸気口から吸引さ
れ速やかに強制排出される。これにより、余剰の
ガラス微粒子の軸方向への拡散が抑制され、多孔
質母材の上方に余剰のガラス微粒子が付着しなく
なり、多孔質母材の外径変動が防止される。ま
た、多孔質母材の成長端の周囲に、吸気口が設け
られているので、少量の吸引量で効率的に余剰の
ガラス微粒子を排出することができる。
In this method, the vicinity of the growth end of the porous base material is sucked through a ring-shaped exhaust pipe with an air intake port on the inner periphery, so that the glass particles generated by the glass particle synthesis burner are removed. Among them, surplus glass particles that are not used to form the porous base material are sucked through the inlet of the ring-shaped exhaust pipe and quickly forcibly discharged. This suppresses the diffusion of excess glass particles in the axial direction, prevents excess glass particles from adhering above the porous base material, and prevents fluctuations in the outer diameter of the porous base material. Furthermore, since the suction port is provided around the growth end of the porous base material, excess glass particles can be efficiently discharged with a small amount of suction.
以下、この発明の実施例を添付図面に基づいて
説明する。
Embodiments of the present invention will be described below with reference to the accompanying drawings.
第１図は、この発明を実施する装置の概略図で
ある。すなわち、反応容器１内に、石英系ガラス
等から成る棒状基材２を挿入し、この棒状基材２
の下端にガラス微粒子合成用バーナ３から原料ガ
スを吹き当てて煤状のガラス微粒子を付着堆積さ
せるようになつている。上記棒状基材２は回転し
ながら上方に引き上げられ、ガラス微粒子が軸方
向に付着堆積し、これにより棒状基材２の軸方向
にガラス微粒子の多孔質母材４が連続的に成長す
る。 FIG. 1 is a schematic diagram of an apparatus implementing the invention. That is, a rod-shaped base material 2 made of quartz glass or the like is inserted into a reaction container 1, and this rod-shaped base material 2 is
A raw material gas is blown from a burner 3 for synthesizing glass fine particles onto the lower end of the glass particle, so that soot-like glass particles are deposited thereon. The rod-shaped base material 2 is pulled upward while rotating, and glass fine particles are deposited in the axial direction, whereby a porous base material 4 of glass fine particles grows continuously in the axial direction of the rod-shaped base material 2.
上記多孔質母材４の成長端５の周囲近傍に、内
周に吸気口６を有するリング状の排気管７を設
け、この排気管７によつて吸気を行い、多孔質母
材４の形成に使用されなかつたガラス微粒子を強
制的に排出する。この際、排気管７からの排気を
助長するために反応容器１内に排出用のガス８を
送り込むことが好ましい。 A ring-shaped exhaust pipe 7 having an intake port 6 on the inner periphery is provided near the growth end 5 of the porous base material 4, and air is taken in through the exhaust pipe 7 to form the porous base material 4. Forcibly discharge unused glass particles. At this time, it is preferable to send exhaust gas 8 into the reaction vessel 1 in order to promote exhaustion from the exhaust pipe 7.
なお、第１図及び第２図の実施例においては、
ガラス微粒子合成用バーナ３を１本だけ使用して
いるが、このガラス微粒子合成用バーナ３を複数
本にしてもよい。 In addition, in the embodiment shown in FIGS. 1 and 2,
Although only one glass particle synthesis burner 3 is used, a plurality of glass particle synthesis burners 3 may be used.
次に、上記実施例において、ガラス微粒子合成
用バーナ３に原料（SiCl4、GeCL4等）及びAr、
He、H2、O2を流し、気相軸付法により多孔質母
材４を形成した場合、多孔質母材４の軸方向にお
ける外径が80±0.5mmの範囲のものが、60mm／ｈ
の速さで成長した。合成した多孔質母材４の長さ
は600mmであり、長時間にわたり外径の安定した
ものが得られた。 Next, in the above example, raw materials (SiCl 4 , GeCL 4 etc.) and Ar,
When the porous base material 4 is formed by flowing He, H 2 and O 2 and using the vapor phase axial method, the outer diameter of the porous base material 4 in the axial direction is within the range of 80 ± 0.5 mm. h
grew at the speed of The length of the synthesized porous base material 4 was 600 mm, and the outer diameter was stable over a long period of time.
この発明は、以上の如きものであるから、反応
容器内のガラス微粒子の流れを乱すことなく、多
孔質母材の形成に使用されなかつたガラス微粒子
が効率的に排出され、多孔質母材径の変動がない
適正な屈折率分布を有する光フアイバ用多孔質母
材が安定して得られるという効果を奏する。
Since the present invention is as described above, the glass particles that are not used for forming the porous base material are efficiently discharged without disturbing the flow of the glass particles in the reaction vessel, and the diameter of the porous base material is reduced. It is possible to stably obtain a porous preform for an optical fiber having an appropriate refractive index distribution without any fluctuation.
第１図はこの発明の実施装置の一例を示す部分
縦断正面図、第２図は同上の横断面図、第３図は
排気管の斜視図である。
２……棒状基材、３……ガラス微粒子合成用バ
ーナ、４……多孔質母材、５……成長端、６……
吸気口、７……排気管。
FIG. 1 is a partial longitudinal sectional front view showing an example of an apparatus for implementing the present invention, FIG. 2 is a cross-sectional view of the same, and FIG. 3 is a perspective view of an exhaust pipe. 2... Rod-shaped base material, 3... Burner for glass particle synthesis, 4... Porous base material, 5... Growth end, 6...
Intake port, 7...Exhaust pipe.
Claims (1)
ス微粒子を付着堆積させることにより、棒状基材
の軸方向にガラス微粒子の多孔質母材を連続的に
成長させる光フアイバ用多孔質母材の製造方法に
おいて、多孔質母材の成長端の周囲近傍に、内周
に吸気口を有するリング状の排気管を設け、この
排気管から余剰のガラス微粒子を排出することを
特徴とする光フアイバ用多孔質母材の製造方法。1. Production of a porous base material for optical fiber in which a porous base material of glass fine particles is continuously grown in the axial direction of the rod-shaped base material by depositing glass fine particles on the lower end of a rod-shaped base material that rises while rotating. In the method, a ring-shaped exhaust pipe having an inlet on the inner periphery is provided near the growth end of the porous base material, and excess glass particles are discharged from the exhaust pipe. Manufacturing method of quality base material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16660385A JPS6227345A (en) | 1985-07-25 | 1985-07-25 | Production of porous base material for optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16660385A JPS6227345A (en) | 1985-07-25 | 1985-07-25 | Production of porous base material for optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6227345A JPS6227345A (en) | 1987-02-05 |
| JPH0225848B2 true JPH0225848B2 (en) | 1990-06-06 |
Family
ID=15834354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16660385A Granted JPS6227345A (en) | 1985-07-25 | 1985-07-25 | Production of porous base material for optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6227345A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0822997B2 (en) * | 1989-01-18 | 1996-03-06 | 信越化学工業株式会社 | Hard coating agent |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54134723A (en) * | 1978-04-12 | 1979-10-19 | Nippon Telegraph & Telephone | Manufacture of optical fiber parent material |
-
1985
- 1985-07-25 JP JP16660385A patent/JPS6227345A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54134723A (en) * | 1978-04-12 | 1979-10-19 | Nippon Telegraph & Telephone | Manufacture of optical fiber parent material |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6227345A (en) | 1987-02-05 |
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