JPS629295Y2 - - Google Patents
Info
- Publication number
- JPS629295Y2 JPS629295Y2 JP8813183U JP8813183U JPS629295Y2 JP S629295 Y2 JPS629295 Y2 JP S629295Y2 JP 8813183 U JP8813183 U JP 8813183U JP 8813183 U JP8813183 U JP 8813183U JP S629295 Y2 JPS629295 Y2 JP S629295Y2
- Authority
- JP
- Japan
- Prior art keywords
- base material
- optical fiber
- burner
- glass powder
- opening surface
- 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
Links
- 239000000463 material Substances 0.000 claims description 33
- 239000013307 optical fiber Substances 0.000 claims description 24
- 239000011521 glass Substances 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 238000000151 deposition Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000006460 hydrolysis reaction Methods 0.000 claims description 2
- 239000005373 porous glass Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 10
- 238000009826 distribution Methods 0.000 description 4
- 238000005253 cladding Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229910003902 SiCl 4 Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000075 oxide glass Substances 0.000 description 1
- RLOWWWKZYUNIDI-UHFFFAOYSA-N phosphinic chloride Chemical compound ClP=O RLOWWWKZYUNIDI-UHFFFAOYSA-N 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
Landscapes
- Glass Melting And Manufacturing (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Description
本考案はVAD法により光フアイバ母材を製造
する際に使用される光フアイバ母材の製造装置に
関するものである。
光フアイバはその中心部分（コア）の屈折率を
周囲（クラツド）より0.2〜１％程度高くしてあ
り、この光フアイバの製造は、その直径方向の屈
折率分布と相似な屈折率分布をもつた大型の棒状
ガラス体（母材またはプリフオームと呼称されて
いる）を製造する工程と、母材をフアイバー化す
る線引き工程からなつている。
前記母材の製造方法として下記に示すVAD
（Vapor Phase Avial Deposition）法が多用され
ている。すなわち、このVAD法は気相状態にし
たSiCl4、GeCl4、POCl3などの原料ガスを酸水素
バーナー中に導入し、火炎中で加水分解反応を生
じさせ、これにより生成した酸化物ガラス微粒子
を回転する種棒の下端に連続的に堆積させ、多孔
質ガラス母材を得る方法である。この方法では多
孔質母材は回転、上昇して逐次上部に位置するリ
ング状のヒータで加熱、透明化され、光フアイバ
母材となるようになつている。前記SiCl4は石英
ガラスの主成分となり、GeCl4などは石英ガラス
の屈折率分布制御のためのドーパントとして添加
されるものである。そして、酸水素バーナーに
は、コア母材を形成するのに使われるもの（コア
バーナー）と、クラツドを形成するのに使われる
もの（クラツドバーナー）に２分される複数のノ
ズルがあつて、各ノズルで吹き出し原料組成を調
整することによつて、空間的な組成分布をつく
り、母材中に屈折率分布を形成するようになつて
いる。
このようなVAD法を実施する装置として第１
図に示す構造のものがある。図中符号１は種棒で
あり、２は回転する種棒１の下端にガラス微粉末
からなる円柱状のコア母材３を堆積、形成するコ
アバーナーである。このコアバーナー２の斜め上
方、つまり上記コア母材３とクラツド母材４とか
らなる光フアイバ母材５の下端部（成長部）５ａ
の一側部には、前記コア母材３の外周部にガラス
微粉末からなるクラツド母材４を形成する複数の
バーナーからなるクラツドバーナー６が設けられ
ている。そして、前記光フアイバ母材５の成長部
５ａの他側部には上記各バーナーにより発生する
排ガスや余剰のガラス微粉末を装置外へ排出する
排気管７が設けられている。
前記光フアイバ母材５の成長部５ａは、上記の
ように下方から上方に配列されているコアバーナ
ー２およびクラツドバーナー６によつてガラス微
粉末を付着される部分であるため、その先端から
上方に向かつてテーパ状に拡径する形状となつて
いる。
ところで、前記構造の光フアイバ母材の製造装
置において、次のような欠点がある。すなわち、
前記排気管７は円筒形に形成されているため、そ
の吸気開口面における管内への吸気力は中心部分
が強くなつており、周辺部分は弱くなつている。
ところが、この製造装置の構造上、つまり、バー
ナーが上下に配列されており、かつそれらの発生
する熱により上昇気流が生じており、排ガス、余
剰ガラス微粉末が上方に集積する構造となつてい
るので、上方程大きな排気力が必要とされること
になる。しかし、前記のように排気管７の吸気開
口面での管内への吸気力は、その中心部が一番高
くなつているので、排ガス、余剰ガラス微粉末の
排出が有効に行なわれないでいる。そのため、製
造される光フアイバ母材５の品質の向上が妨げら
れることになる。
本考案は、上記事情に鑑みてなされたもので、
バーナーにより生成される排ガスと余剰のガラス
微粉末を少ない排気量で有効に排出することがで
き、その結果、安定した良質の光フアイバ母材を
製造することのできる光フアイバ母材の製造装置
を提供することを目的とするものである。
以下、本考案を図面を参照して説明する。第２
図は本考案の一実施例を示すもので、図中第１図
と共通する部分には同一符号を付して説明を簡略
化する。図中符号１０は排気管を示すものであ
る。この排気管１０はほぼ四角筒状に形成されて
おり、その吸気開口面１１は前記光フアイバ母材
５の成長部５ａの周面の傾斜角度にほぼ等しい角
度で傾斜するように形成されている。つまり、前
記吸気開口面１１と前記成長部５ａの周面とは、
一定の間隔を置いてほぼ平行となつている。ま
た、第３，４図に示すように、前記吸気開口面１
１はその下端１１ａから上端１１ｂに向かつてテ
ーパ状に拡幅するように形成されている。このテ
ーパ傾斜角度は前記光フアイバ母材の成長部５ａ
の周面の傾斜角度にほぼ等しく設定されている。
このように、排気管１０の吸気開口面１１は光
フアイバ母材５の成長部５ａから常に等距離にあ
るので、各バーナーから発生する排ガスおよび余
剰ガラス微粉末は、上昇拡散する前に排気管１０
内に吸引されることになる。また、前記吸気開口
面１１は前記成長部５ａの拡径に伴なつて、上方
に行く程幅広となつているので、前記排気管１０
は最も排気物量の多い上方において、管内への吸
気量が多くなり、成長部５ａの上方に集まつてく
る排ガス、余剰ガラス微粉末を余すところなく装
置外へ排出することができる。
従つて、本考案によれば、バーナーにより生成
される排ガスと余剰ガラス微粉末を少ない排気量
で有効に排出することができ、その結果、安定し
た良質の光フアイバ母材を製造することができ
る。
このような本考案の効果を確認するために下記
のような実験を行なつた。
（実験例）
従来（第１図）および前記実施例（第２図ない
し第３図）の各装置を使い、それぞれ下表組成、
流量の原料ガスを各バーナーから吹き出して、光
フアイバ母材を製造し、製造中の排気効率および
製造後の光フアイバ母材を目視によつて観察し
た。
なお、表中、No.−１はコアバーナーを示し、No.
２〜６は順次上方に向かつて配列しているクラツ
ドバーナーの各バーナーを示すものである。
The present invention relates to an optical fiber preform manufacturing apparatus used when manufacturing an optical fiber preform by the VAD method. An optical fiber has a refractive index in its center (core) that is approximately 0.2 to 1% higher than its surroundings (cladding), and this optical fiber is manufactured to have a refractive index distribution similar to that in the diametrical direction. The process consists of a process of manufacturing a large rod-shaped glass body (called a base material or preform), and a drawing process of turning the base material into fiber. The method for manufacturing the base material is VAD as shown below.
(Vapor Phase Avial Deposition) method is often used. In other words, in this VAD method, raw material gas such as SiCl 4 , GeCl 4 , POCl 3 in a gaseous state is introduced into an oxyhydrogen burner, and a hydrolysis reaction occurs in a flame, resulting in the production of oxide glass fine particles. This is a method to obtain a porous glass base material by depositing continuously on the lower end of a rotating seed rod. In this method, the porous base material is rotated and raised, and successively heated and transparentized by a ring-shaped heater located at the top, so that it becomes an optical fiber base material. The SiCl 4 is the main component of silica glass, and GeCl 4 and the like are added as dopants to control the refractive index distribution of the silica glass. The oxyhydrogen burner has multiple nozzles that are divided into two types: one used to form the core base material (core burner) and the other used to form the cladding (clad burner). By adjusting the composition of the blown raw material from each nozzle, a spatial composition distribution is created and a refractive index distribution is formed in the base material. This is the first device to implement this type of VAD method.
There is a structure shown in the figure. Reference numeral 1 in the figure is a seed rod, and 2 is a core burner that deposits and forms a cylindrical core base material 3 made of fine glass powder on the lower end of the rotating seed rod 1. Diagonally above the core burner 2, that is, the lower end (growth part) 5a of the optical fiber base material 5 consisting of the core base material 3 and the clad base material 4.
A clad burner 6 consisting of a plurality of burners is provided on one side of the core base material 3 to form a clad base material 4 made of fine glass powder on the outer periphery of the core base material 3. An exhaust pipe 7 is provided on the other side of the growth section 5a of the optical fiber base material 5 for discharging exhaust gas generated by each of the burners and excess glass powder to the outside of the apparatus. The growing portion 5a of the optical fiber base material 5 is the portion to which fine glass powder is attached by the core burner 2 and the cladding burner 6 arranged from the bottom to the top as described above. It has a shape that tapers upward and expands in diameter. By the way, the optical fiber base material manufacturing apparatus having the above structure has the following drawbacks. That is,
Since the exhaust pipe 7 is formed in a cylindrical shape, the suction force into the pipe at its intake opening surface is strong at the center and weak at the periphery.
However, due to the structure of this manufacturing equipment, the burners are arranged one above the other, and the heat generated by them creates an upward air current, which causes exhaust gas and excess glass powder to accumulate upward. Therefore, the higher the position, the greater the exhaust force required. However, as mentioned above, the intake force into the pipe at the intake opening surface of the exhaust pipe 7 is highest at the center, so exhaust gas and excess glass powder cannot be effectively discharged. . Therefore, improvement in the quality of the manufactured optical fiber base material 5 is hindered. This invention was made in view of the above circumstances,
We have developed an optical fiber base material manufacturing device that can effectively exhaust the exhaust gas generated by the burner and excess glass fine powder with a small exhaust volume, and as a result, produce optical fiber base materials of stable and high quality. The purpose is to provide Hereinafter, the present invention will be explained with reference to the drawings. Second
The figure shows one embodiment of the present invention, and parts in the figure that are common to those in FIG. 1 are given the same reference numerals to simplify the explanation. Reference numeral 10 in the figure indicates an exhaust pipe. This exhaust pipe 10 is formed into a substantially rectangular cylindrical shape, and its intake opening surface 11 is formed to be inclined at an angle substantially equal to the inclination angle of the circumferential surface of the growth portion 5a of the optical fiber base material 5. . In other words, the intake opening surface 11 and the circumferential surface of the growth portion 5a are
They are almost parallel with a certain distance between them. Further, as shown in FIGS. 3 and 4, the intake opening surface 1
1 is formed so as to taper and widen from its lower end 11a toward its upper end 11b. This taper inclination angle is determined by the growth portion 5a of the optical fiber base material.
is set approximately equal to the inclination angle of the circumferential surface. In this way, the intake opening surface 11 of the exhaust pipe 10 is always at the same distance from the growth part 5a of the optical fiber base material 5, so that the exhaust gas and excess glass powder generated from each burner reach the exhaust pipe before ascending and diffusing. 10
It will be sucked inside. Further, the intake opening surface 11 becomes wider upwardly as the diameter of the growth portion 5a increases, so that the exhaust pipe 10
The amount of air taken into the tube increases in the upper part where the amount of exhaust gas is greatest, and the exhaust gas and excess glass fine powder that collect above the growth part 5a can be completely discharged to the outside of the apparatus. Therefore, according to the present invention, the exhaust gas generated by the burner and excess glass fine powder can be effectively discharged with a small amount of exhaust gas, and as a result, a stable and high-quality optical fiber base material can be manufactured. . In order to confirm the effects of the present invention, the following experiment was conducted. (Experimental example) Using the conventional (Fig. 1) and the above-mentioned embodiments (Figs. 2 and 3), the following compositions were prepared.
Optical fiber preforms were manufactured by blowing out a flow rate of raw material gas from each burner, and the exhaust efficiency during manufacture and the optical fiber preforms after manufacture were visually observed. In addition, in the table, No.-1 indicates the core burner, and No.-1 indicates the core burner.
Reference numerals 2 to 6 indicate the burners of the clad burners that are sequentially arranged upward.
【表】
上記実験、観察の結果、従来の装置では、装置
の反応容器がガラス微粉末で見えなくなる程、排
気効率が悪く、そのため、ガラス微粒子の堆積制
御ができなくなり、母材を長尺なものにできなか
つた。これに対し、本考案の装置では反応容器内
に全くガラス微粉末はつかず、排気効率が高く、
長尺の母材が作製でき、本考案の優れた利点か確
認することができた。[Table] As a result of the above experiments and observations, in the conventional equipment, the exhaust efficiency is so poor that the reaction vessel of the equipment is obscured by fine glass powder.As a result, it is impossible to control the deposition of glass fine particles, and the base material is I couldn't make it into something. In contrast, with the device of the present invention, no fine glass powder is deposited inside the reaction vessel, and the exhaust efficiency is high.
A long base material could be produced, confirming the superior advantages of the present invention.
第１図は従来の光フアイバ母材の製造装置の側
面図、第２図ないし第４図は本考案の一実施例を
説明するためのもので、第２図は本考案に係る光
フアイバ母材の製造装置の側面図、第３図は排気
管の正面図、第４図は同排気管の平面図である。
１……種棒、２……コアバーナー、３……コア
母材、４……クラツド母材、５……光フアイバ母
材、５ａ……光フアイバ母材の成長部、６……ク
ラツドバーナー、１０……排気管、１１……吸気
開口面、１１ａ……吸気開口面の下端、１１ｂ…
…吸気開口面の上端。
FIG. 1 is a side view of a conventional optical fiber preform manufacturing apparatus, FIGS. 2 to 4 are for explaining an embodiment of the present invention, and FIG. 2 is a side view of a conventional optical fiber preform manufacturing apparatus. FIG. 3 is a front view of the exhaust pipe, and FIG. 4 is a plan view of the exhaust pipe. DESCRIPTION OF SYMBOLS 1... seed rod, 2... core burner, 3... core base material, 4... clad base material, 5... optical fiber base material, 5a... growth part of optical fiber base material, 6... clad Burner, 10...Exhaust pipe, 11...Intake opening surface, 11a...Lower end of intake opening surface, 11b...
...The upper edge of the intake opening surface.
Claims (1)
末を回転上昇される種棒下端に付着堆積させて円
柱状のガラス多孔質コア母材を形成するコアバー
ナと、前記コア母材外周部に火炎加水分解反応に
よつてえられるガラス微粉末を付着堆積させてガ
ラス多孔質クラツド母材を形成する単数または複
数のバーナーからなるクラツドバーナーと、前記
各バーナーにより発生する排ガスや余剰のガラス
微粉末を排出する排気管とを具備してなる光フア
イバ母材の製造装置において、前記排気管の吸気
開口面を前記母材の先端成長部の傾斜面にほぼ平
行に形成するとともに前記母材の成長部下端から
上方に向かつて生ずる拡径に伴なつて前記開口面
下端から上端にかけてテーパ状に拡幅するように
形成したことを特徴とする光フアイバ母材の製造
装置。 A core burner that forms a cylindrical glass porous core base material by depositing fine glass powder obtained through a flame hydrolysis reaction on the lower end of a rotating seed rod; A clad burner consisting of one or more burners that deposits fine glass powder obtained by reaction to form a porous glass clad base material, and discharges exhaust gas and surplus fine glass powder generated by each of the burners. An apparatus for manufacturing an optical fiber preform, comprising: an exhaust pipe having an inlet opening surface parallel to an inclined surface of a growing tip of the preform; 1. An apparatus for manufacturing an optical fiber preform, characterized in that the width is tapered from the lower end to the upper end of the opening surface as the diameter increases upwardly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8813183U JPS59193831U (en) | 1983-06-09 | 1983-06-09 | Optical fiber base material manufacturing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8813183U JPS59193831U (en) | 1983-06-09 | 1983-06-09 | Optical fiber base material manufacturing equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59193831U JPS59193831U (en) | 1984-12-22 |
| JPS629295Y2 true JPS629295Y2 (en) | 1987-03-04 |
Family
ID=30218044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8813183U Granted JPS59193831U (en) | 1983-06-09 | 1983-06-09 | Optical fiber base material manufacturing equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59193831U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000066629A (en) * | 1998-04-06 | 2000-03-03 | Em Microelectronic Marin Sa | Control device of liquid crystal display cell |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2804094B2 (en) * | 1989-07-07 | 1998-09-24 | 株式会社フジクラ | Glass particle deposition equipment |
-
1983
- 1983-06-09 JP JP8813183U patent/JPS59193831U/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000066629A (en) * | 1998-04-06 | 2000-03-03 | Em Microelectronic Marin Sa | Control device of liquid crystal display cell |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59193831U (en) | 1984-12-22 |
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