JPH05147969A - Optical fiber drawing furnace - Google Patents
Optical fiber drawing furnaceInfo
- Publication number
- JPH05147969A JPH05147969A JP31774791A JP31774791A JPH05147969A JP H05147969 A JPH05147969 A JP H05147969A JP 31774791 A JP31774791 A JP 31774791A JP 31774791 A JP31774791 A JP 31774791A JP H05147969 A JPH05147969 A JP H05147969A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- partition plate
- space
- base material
- drawing chamber
- 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
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/029—Furnaces therefor
-
- 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
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/60—Optical fibre draw furnaces
- C03B2205/90—Manipulating the gas flow through the furnace other than by use of upper or lower seals, e.g. by modification of the core tube shape or by using baffles
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、大形光ファイバ母材か
ら線径変動の少ない光ファイバを得ることができる光フ
ァイバ線引炉に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber drawing furnace capable of obtaining an optical fiber having a small wire diameter variation from a large-sized optical fiber preform.
【0002】[0002]
【従来の技術】従来より光ファイバ母材(以下、単に母
材とも称す)を加熱溶融し、線引きして光ファイバを得
るために光ファイバ線引炉が用いられる。2. Description of the Related Art Conventionally, an optical fiber drawing furnace has been used to obtain an optical fiber by heating and melting an optical fiber preform (hereinafter also simply referred to as a preform) and drawing it.
【0003】この光ファイバ線引炉の一例を図4に示
す。同図に示すように、線引炉は炉芯部1と煙突部2と
からなる。炉芯部1はカーボンなどからなる炉芯管3の
周囲にヒータ4を設けた構造を有しており、その上下側
には内部が水冷構造となっている上蓋部5及び下蓋部6
で仕切られている。また、煙突部2はカーボンなどから
なり、炉芯管3と同径の内筒管7を有しており、その周
囲は通常安全のため、水冷構造となっている。そして、
炉芯管3とその上方に連通する内筒管7とで円筒状の線
引室8を形成しており、この線引室8内には上方からダ
ミー棒9に支えられた光ファイバ母材10が挿入されて
いる。さらに、内筒管7の上部壁面には不活性ガス噴出
口11が円周方向に均一に形成されており、内筒管7の
外側に形成された不活性ガス通路12を介して外部から
供給される不活性ガスが線引室8内に連続的に流入され
るようになっている。なお、図中13は、煙突部2の上
部開口を塞ぎ外部空気の流入を防ぐ蓋である。An example of this optical fiber drawing furnace is shown in FIG. As shown in the figure, the drawing furnace is composed of a furnace core portion 1 and a chimney portion 2. The furnace core portion 1 has a structure in which a heater 4 is provided around a furnace core tube 3 made of carbon or the like, and an upper lid portion 5 and a lower lid portion 6 having a water cooling structure inside are provided on the upper and lower sides thereof.
It is divided by. Further, the chimney portion 2 is made of carbon or the like, and has an inner cylindrical tube 7 having the same diameter as the furnace core tube 3, and the surrounding area is usually water-cooled for safety. And
A cylindrical drawing chamber 8 is formed by the furnace core tube 3 and an inner cylindrical tube 7 that communicates with the furnace core tube 3, and an optical fiber preform supported by a dummy rod 9 from above is formed in the drawing chamber 8. 10 is inserted. Further, an inert gas ejection port 11 is uniformly formed in the circumferential direction on the upper wall surface of the inner cylindrical pipe 7, and is supplied from the outside through an inert gas passage 12 formed outside the inner cylindrical pipe 7. The inert gas to be introduced is continuously introduced into the drawing chamber 8. In addition, 13 in the figure is a lid that closes the upper opening of the chimney part 2 and prevents the inflow of external air.
【0004】かかる線引炉を用い、不活性ガス噴出口1
1から不活性ガスを連続的に流入して線引室8内を不活
性ガスを満たすと共にヒータ4で炉芯管3を加熱するこ
とにより、光ファイバ母材10の下端から光ファイバ1
4を線引きすることができる。なお、このようにして線
引きされる光ファイバ14の線径変動は通常、±0.3
μm程度であり、実用上十分な性能を有するものであっ
た。Using such a drawing furnace, an inert gas jet 1
1 from the lower end of the optical fiber preform 10 by continuously flowing the inert gas from 1 to fill the inside of the drawing chamber 8 with the inert gas and heating the furnace core tube 3 with the heater 4.
4 can be delineated. The variation of the diameter of the optical fiber 14 drawn in this way is usually ± 0.3
It was about μm, and had a practically sufficient performance.
【0005】[0005]
【発明が解決しようとする課題】ところで、近年、光フ
ァイバの量産、低コスト化により光ファイバ母材10が
大形化してきた。しかし、例えば直径125mm、長さ1
20mm程度の大形母材を用いて線引きすると、線径変動
が±3〜10μmと大きくなり、高性能化が求められて
いる光通信分野等では使用できないという問題がある。By the way, in recent years, the optical fiber preform 10 has become larger due to mass production of optical fibers and cost reduction. However, for example, diameter 125mm, length 1
When a large base material of about 20 mm is used for wire drawing, the variation in wire diameter becomes large at ± 3 to 10 μm, and there is a problem that it cannot be used in the optical communication field and the like where high performance is required.
【0006】本発明はこのような事情に鑑み、大形母材
を線引きしても線径変動が小さく抑えられる光ファイバ
線引炉を提供することを目的とする。In view of such circumstances, it is an object of the present invention to provide an optical fiber drawing furnace capable of suppressing a change in wire diameter even when a large preform is drawn.
【0007】[0007]
【課題を解決するための手段】前記目的を達成する本発
明に係る光ファイバ線引炉は、上部から連続的に流入さ
れる不活性ガスで満たされる線引室を有し、該線引室の
上端開口からダミー棒に支えられて挿入される光ファイ
バ母材を加熱溶融してその下端から光ファイバを線引き
する光ファイバ線引炉において、上記ダミー棒の途中に
設けられて上記線引室の上記光ファイバ母材より上の空
間で当該線引室の周囲壁面近傍以外を上下方向に画成す
る仕切板を具えたことを特徴とし、また、上記構成にお
いて、仕切板に上下方向に貫通する複数の貫通孔を有す
ることを特徴とし、さらに、上記構成において、仕切板
の直径が線引室の内径よりは小さく光ファイバ母材の直
径より大きいことを特徴とする。An optical fiber drawing furnace according to the present invention that achieves the above object has a drawing chamber filled with an inert gas continuously introduced from above, and the drawing chamber is provided. In an optical fiber drawing furnace that heats and melts an optical fiber preform that is inserted by being supported by a dummy rod from the upper end opening of the optical fiber and draws an optical fiber from the lower end thereof, the drawing chamber is provided in the middle of the dummy rod. The above-mentioned optical fiber preform, characterized in that it comprises a partition plate that defines in the vertical direction in the space above the peripheral wall surface of the drawing chamber, and in the above configuration, penetrates the partition plate in the vertical direction. And the partition plate has a diameter smaller than the inner diameter of the drawing chamber and larger than the diameter of the optical fiber preform.
【0008】[0008]
【作用】線引室の上部から流入される不活性ガスは、仕
切板の周面と当該線引室壁面との間の隙間から当該線引
室の仕切板と光ファイバ母材との間の空間に流れ込み、
加熱された後、光ファイバ母材の周囲と線引室壁面との
隙間から光ファイバ母材の下側へ流れ込む。これによ
り、光ファイバ母材の下端の線引き部の周囲の温度の乱
れ及びガス流の乱れが生じにくくなり、線引きされる光
ファイバの線径が安定する。The inert gas flowing in from the upper part of the drawing chamber flows between the partition plate of the drawing chamber and the optical fiber preform through the gap between the peripheral surface of the partition plate and the wall surface of the drawing chamber. Flowing into the space,
After being heated, it flows into the lower side of the optical fiber preform through the gap between the periphery of the optical fiber preform and the wall of the drawing chamber. As a result, the disturbance of the temperature and the disturbance of the gas flow around the drawn portion at the lower end of the optical fiber preform are less likely to occur, and the diameter of the drawn optical fiber is stabilized.
【0009】また、仕切板に貫通孔を複数個設けた場
合、当該貫通孔を通して整流化された不活性ガスが仕切
板と光ファイバ母材との間に流れ込み、これが光ファイ
バ母材の下側に流れ込むので、光ファイバ母材の下端の
線引き部の周囲のガスの乱れがさらに小さくなる。When a plurality of through holes are provided in the partition plate, the rectified inert gas flows through the through holes between the partition plate and the optical fiber preform, and this is the lower side of the optical fiber preform. The gas turbulence around the drawn portion at the lower end of the optical fiber preform is further reduced because it flows into the.
【0010】これに対し、仕切板を設けない場合には、
光ファイバ母材の上方の空間内では不活性ガスの流れが
乱れており、且つ上部の冷えた部分との対流があるので
全体的に温度が低い。したがって、光ファイバ母材の下
側に流れ込む不活性ガスは温度が低く且つ流れが乱れた
状態となるので、線引きが均一に行えないと考えられ
る。On the other hand, when the partition plate is not provided,
The flow of the inert gas is turbulent in the space above the optical fiber preform, and there is convection with the upper cold part, so the temperature is low overall. Therefore, it is considered that the inert gas flowing into the lower side of the optical fiber preform has a low temperature and the flow is disturbed, so that the drawing cannot be performed uniformly.
【0011】[0011]
【実施例】以下、本発明を実施例に基づいて説明する。EXAMPLES The present invention will be described below based on examples.
【0012】図1には一実施例に係る光ファイバ線引炉
の概要を示す。なお、図中、図4と同一作用を示す部材
には同一符号を付して重複する説明は省略する。FIG. 1 shows an outline of an optical fiber drawing furnace according to an embodiment. In the figure, members having the same functions as those in FIG. 4 are designated by the same reference numerals, and overlapping description will be omitted.
【0013】図1に示すように、本実施例ではダミー棒
9の途中に円盤状の仕切板20を係止し、線引室8の光
ファイバ母材10の上方の空間を上下方向に画成してい
る。さらに詳言すると、仕切板20は図3(A)に示す
ように、光ファイバ母材10の直径よりは大きいが内筒
管7及び炉芯管3の内径よりは小さい直径を有する石英
製の円盤であり、中央にダミー棒9との係止孔20aを
有するものである。したがって、仕切板20の周面と内
筒管7との間の隙間d以外の部分の空間は仕切板20に
より上下方向に分画されることになり、線引室8は仕切
板20より上方の空間A、仕切板20と光ファイバ母材
10との間の空間B及び光ファイバ母材10の下側の空
間Cとに区分される。なお、仕切板20と光ファイバ母
材10との間の空間Bは、光ファイバ14の線引きが進
み光ファイバ母材10が小さくなっても、図2に示すよ
うにその大きさに変化はない。また、図中15は光ファ
イバ母材10と一体となつたダミー棒と別途用意したダ
ミー棒とを連結する嵌合部材を示す。As shown in FIG. 1, in this embodiment, a disk-shaped partition plate 20 is locked in the middle of the dummy rod 9 to vertically define a space above the optical fiber preform 10 in the drawing chamber 8. Is made. More specifically, as shown in FIG. 3A, the partition plate 20 is made of quartz and has a diameter larger than the diameter of the optical fiber preform 10 but smaller than the inner diameters of the inner tube 7 and the furnace core tube 3. It is a disk and has a locking hole 20a for locking the dummy rod 9 in the center. Therefore, the space other than the gap d between the peripheral surface of the partition plate 20 and the inner tubular pipe 7 is vertically divided by the partition plate 20, and the drawing chamber 8 is positioned above the partition plate 20. Is divided into a space A, a space B between the partition plate 20 and the optical fiber preform 10, and a space C below the optical fiber preform 10. The space B between the partition plate 20 and the optical fiber preform 10 does not change in size as shown in FIG. 2 even if the drawing of the optical fiber 14 advances and the optical fiber preform 10 becomes smaller. . In addition, reference numeral 15 in the drawing denotes a fitting member for connecting a dummy rod integrally formed with the optical fiber preform 10 and a dummy rod prepared separately.
【0014】また、仕切板20の材質は、耐熱性を有す
るものであれば、石英に限定されず、カーボンや炭化珪
素(SiC)などとすることもできる。The material of the partition plate 20 is not limited to quartz as long as it has heat resistance, and carbon, silicon carbide (SiC) or the like may be used.
【0015】以上説明した光ファイバ線引炉において、
線引室8、特に空間Cをヒータ4により加熱すると共に
不活性ガス噴出口11から不活性ガスを連続的に流入し
て線引室8内を不活性ガスで満たす。すると、仕切板2
0の上方の空間Aでは比較的低温の不活性ガスのガスの
流れ(上下方向の対流)が生じ、このガスの一部が仕切
板20の周囲の隙間dから空間Bに流れ込む。このと
き、隙間dが小さいことから不活性ガスの流れは整流さ
れる。また、不活性ガスは空間Bにおいてはかなり加熱
されており、当該空間Bにおいて比較的に加熱されたガ
スの流れ(対流)が生じ、且つ流れの乱れもない。そし
て、かなり加熱されており、流れが安定した不活性ガス
が光ファイバ母材10の周囲から空間Cに流れ込むの
で、空間Cの温度変化や流れの乱れが少なく、線引きを
安定して行うことができる。In the optical fiber drawing furnace described above,
The drawing chamber 8, particularly the space C, is heated by the heater 4, and the inert gas is continuously introduced from the inert gas jet port 11 to fill the drawing chamber 8 with the inert gas. Then, the partition plate 2
In the space A above 0, a flow of a relatively low temperature inert gas (convection in the vertical direction) occurs, and a part of this gas flows into the space B from the gap d around the partition plate 20. At this time, since the gap d is small, the flow of the inert gas is rectified. Further, since the inert gas is considerably heated in the space B, a relatively heated gas flow (convection) occurs in the space B, and the flow is not disturbed. Then, since the inert gas, which has been heated considerably and has a stable flow, flows into the space C from the periphery of the optical fiber preform 10, the temperature change in the space C and the turbulence of the flow are small, and stable drawing can be performed. it can.
【0016】図1に示す光ファイバ線引炉を用い、直径
125mm、長さ120mmの光ファイバ母材10を線
引きしたところ、光ファイバ14の線径変動は±0.3
μm程度と良好であった。これに対し、仕切板20を外
した場合に同様に線引きしたところ、±0.3μm以上
の線径変動が生じた。When the optical fiber preform 10 having a diameter of 125 mm and a length of 120 mm was drawn using the optical fiber drawing furnace shown in FIG. 1, the fluctuation of the diameter of the optical fiber 14 was ± 0.3.
It was as good as about μm. On the other hand, when the partition plate 20 was removed and the wire was similarly drawn, a wire diameter variation of ± 0.3 μm or more occurred.
【0017】仕切板20の取付け位置は、上述した作用
効果が得られる位置、つまりある程度加熱されて安定し
たガスの流れが形成される空間Bを形成しうる位置とす
ればよく、その取付方法も特に限定されない。また、仕
切板20の直径は光ファイバ母材10の直径より大きく
すれば上述した効果が得られ、且つ内筒管7又は炉芯管
3の内径に近い方が好ましい。なお、仕切板20自体の
厚みは強度が保持できればそれほど厚くする必要がない
ので、その直径は内筒管7又は炉芯管3の内径にかなり
近づけることができる。The partition plate 20 may be mounted at a position where the above-described effects can be obtained, that is, a position where a space B in which a stable gas flow is formed by heating to some extent can be formed. It is not particularly limited. Further, if the diameter of the partition plate 20 is made larger than the diameter of the optical fiber preform 10, the above-described effects are obtained, and it is preferable that the diameter is close to the inner diameter of the inner cylindrical tube 7 or the furnace core tube 3. The thickness of the partition plate 20 itself does not need to be so large as long as the strength can be maintained, and therefore the diameter thereof can be made very close to the inner diameter of the inner cylindrical tube 7 or the furnace core tube 3.
【0018】仕切板としては、図3(B)に示すように
ダミー棒係止孔21aの他、多数の貫通孔21bを有す
る仕切板21を用いることもできる。As the partition plate, a partition plate 21 having a large number of through holes 21b other than the dummy rod locking hole 21a as shown in FIG. 3B can be used.
【0019】かかる仕切板21を用いると、空間Aの不
活性ガスは仕切板21の周面と内筒管7又は炉芯管3と
の隙間dからの他、貫通孔21bから空間Bに流入する
ので、かなり整流された状態となる。したがって、空間
B内のガスの流れがより安定し、これにより、空間Cの
ガス流の乱れがさらに抑えられる。すなわち、仕切板2
1は仕切板20より整流作用が強いので、必ずしも上述
したような空間Bにおけるガスの加熱効果が生じなくて
もよい。どちらにしても仕切板21を用いた場合には仕
切板20を用いた場合と同等又はそれ以上に、光ファイ
バの線径変動を小さく抑えることができる。When the partition plate 21 is used, the inert gas in the space A flows into the space B from the through hole 21b as well as the gap d between the peripheral surface of the partition plate 21 and the inner cylindrical tube 7 or the furnace core tube 3. Therefore, it is in a fairly rectified state. Therefore, the gas flow in the space B becomes more stable, which further suppresses the turbulence of the gas flow in the space C. That is, the partition plate 2
Since 1 has a stronger rectifying action than the partition plate 20, the gas heating effect in the space B as described above does not necessarily have to occur. In any case, when the partition plate 21 is used, the fluctuation of the optical fiber diameter can be suppressed to be as small as or more than that when the partition plate 20 is used.
【0020】[0020]
【発明の効果】以上説明したように、本発明によれば、
仕切板により光ファイバ母材の上部空間を上下方向に画
成し、光ファイバ母材の直ぐ上側に比較的高温でガス流
の乱れもない空間を形成することができるので、大形母
材を用いても線径変動のない光ファイバを連続的に製造
することができる。As described above, according to the present invention,
The partition plate defines the upper space of the optical fiber preform in the up-down direction, and a space with relatively high temperature and no gas flow disturbance can be formed immediately above the optical fiber preform, so that a large preform can be formed. Even if it is used, it is possible to continuously manufacture an optical fiber having no fluctuation in wire diameter.
【図1】一実施例に係る光ファイバ線引炉の概略図であ
る。FIG. 1 is a schematic view of an optical fiber drawing furnace according to an embodiment.
【図2】図1の光ファイバ線引炉の使用状態を示す概略
図である。FIG. 2 is a schematic view showing a usage state of the optical fiber drawing furnace of FIG.
【図3】仕切板の外観を示す説明図である。FIG. 3 is an explanatory diagram showing an appearance of a partition plate.
【図4】従来技術に係る光ファイバ線引炉の概略図であ
る。FIG. 4 is a schematic view of a conventional optical fiber drawing furnace.
1 線引部 2 煙突部 3 炉芯管 4 ヒータ 7 内筒管 8 線引室 9 ダミー棒 10 光ファイバ母材 11 不活性ガス噴出口 14 光ファイバ 20,21 仕切板 20a,21a ダミー棒係止孔 21b 貫通孔 1 Drawing part 2 Chimney part 3 Furnace core tube 4 Heater 7 Inner cylinder tube 8 Drawing chamber 9 Dummy rod 10 Optical fiber base material 11 Inert gas ejection port 14 Optical fiber 20,21 Partition plate 20a, 21a Dummy rod locking Hole 21b through hole
Claims (3)
で満たされる線引室を有し、該線引室の上端開口からダ
ミー棒に支えられて挿入される光ファイバ母材を加熱溶
融してその下端から光ファイバを線引きする光ファイバ
線引炉において、上記ダミー棒の途中に設けられて上記
線引室の上記光ファイバ母材より上の空間で当該線引室
の周囲壁面近傍以外を上下方向に画成する仕切板を具え
たことを特徴とする光ファイバ線引炉。1. An optical fiber preform, which has a drawing chamber filled with an inert gas continuously flowed in from an upper portion and is supported by a dummy rod from an upper end opening of the drawing chamber and is melted by heating. Then, in an optical fiber drawing furnace for drawing an optical fiber from the lower end thereof, provided in the middle of the dummy rod and in the space above the optical fiber preform of the drawing chamber except near the peripheral wall surface of the drawing chamber. An optical fiber drawing furnace, characterized in that it comprises a partition plate that defines the vertical direction.
貫通する複数の貫通孔を有することを特徴とする光ファ
イバ線引炉。2. The optical fiber drawing furnace according to claim 1, wherein the partition plate has a plurality of through holes penetrating in the vertical direction.
が線引室の内径よりは小さく光ファイバ母材の直径より
大きいことを特徴とする光ファイバ線引炉。3. The optical fiber drawing furnace according to claim 1, wherein the partition plate has a diameter smaller than the inner diameter of the drawing chamber and larger than the diameter of the optical fiber preform.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP31774791A JP3141464B2 (en) | 1991-12-02 | 1991-12-02 | Optical fiber drawing furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP31774791A JP3141464B2 (en) | 1991-12-02 | 1991-12-02 | Optical fiber drawing furnace |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05147969A true JPH05147969A (en) | 1993-06-15 |
JP3141464B2 JP3141464B2 (en) | 2001-03-05 |
Family
ID=18091587
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP31774791A Expired - Lifetime JP3141464B2 (en) | 1991-12-02 | 1991-12-02 | Optical fiber drawing furnace |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3141464B2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999051534A1 (en) * | 1998-04-03 | 1999-10-14 | Sumitomo Electric Industries, Ltd. | Furnace and method for optical fiber wire drawing |
WO2000029342A1 (en) * | 1998-11-13 | 2000-05-25 | Sumitomo Electric Industries, Ltd. | Optical fiber drawing method and drawing furnace |
US6993937B2 (en) * | 1999-12-27 | 2006-02-07 | Alcatel | Preform inlet arrangement for an optical fiber drawing furnace, a furnace provided with that kind of inlet arrangement, and a preform equipped to co-operate with that inlet arrangement |
JP2013014468A (en) * | 2011-07-04 | 2013-01-24 | Sumitomo Electric Ind Ltd | Sintering apparatus and sintering method for glass preform |
CN110577357A (en) * | 2018-06-11 | 2019-12-17 | 住友电气工业株式会社 | Method for drawing optical fiber |
-
1991
- 1991-12-02 JP JP31774791A patent/JP3141464B2/en not_active Expired - Lifetime
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999051534A1 (en) * | 1998-04-03 | 1999-10-14 | Sumitomo Electric Industries, Ltd. | Furnace and method for optical fiber wire drawing |
US6668592B1 (en) | 1998-04-03 | 2003-12-30 | Sumitomo Electric Industries, Ltd. | Optical fiber drawing furnace having adjustable partitions |
US6810692B2 (en) | 1998-04-03 | 2004-11-02 | Sumitomo Electric Industries, Ltd. | Method of controlling an upper portion of an optical fiber draw furnace |
WO2000029342A1 (en) * | 1998-11-13 | 2000-05-25 | Sumitomo Electric Industries, Ltd. | Optical fiber drawing method and drawing furnace |
GB2361472B (en) * | 1998-11-13 | 2003-02-12 | Sumitomo Electric Industries | Optical fiber drawing method and drawing furnace |
US6735983B1 (en) | 1998-11-13 | 2004-05-18 | Sumitomo Electric Industries, Ltd. | Optical fiber drawing method and drawing furnace |
US6993937B2 (en) * | 1999-12-27 | 2006-02-07 | Alcatel | Preform inlet arrangement for an optical fiber drawing furnace, a furnace provided with that kind of inlet arrangement, and a preform equipped to co-operate with that inlet arrangement |
JP2013014468A (en) * | 2011-07-04 | 2013-01-24 | Sumitomo Electric Ind Ltd | Sintering apparatus and sintering method for glass preform |
CN110577357A (en) * | 2018-06-11 | 2019-12-17 | 住友电气工业株式会社 | Method for drawing optical fiber |
CN110577357B (en) * | 2018-06-11 | 2023-03-03 | 住友电气工业株式会社 | Method for drawing optical fiber |
Also Published As
Publication number | Publication date |
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JP3141464B2 (en) | 2001-03-05 |
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