JPH0648760A - Production of performed material for optical fiber - Google Patents
Production of performed material for optical fiberInfo
- Publication number
- JPH0648760A JPH0648760A JP22320592A JP22320592A JPH0648760A JP H0648760 A JPH0648760 A JP H0648760A JP 22320592 A JP22320592 A JP 22320592A JP 22320592 A JP22320592 A JP 22320592A JP H0648760 A JPH0648760 A JP H0648760A
- Authority
- JP
- Japan
- Prior art keywords
- heating furnace
- optical fiber
- fiber preform
- length
- glass fine
- 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
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]
- C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
- C03B37/0146—Furnaces therefor, e.g. muffle tubes, furnace linings
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Thermal 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、ガラス微粒子体を焼結
して透明ガラス化する光ファイバ母材の製造方法に関
し、特に、焼結処理の高速化とガラス微粒子体支持棒
（ダミーロッド）の保護を図った方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an optical fiber preform by sintering a glass fine particle body into a transparent vitreous material, and particularly, to speed up the sintering process and a glass fine particle body supporting rod (dummy rod). It relates to a method for protecting the.
【０００２】[0002]
【従来の技術】光ファイバ母材の製造における一般的な
焼結工程を示すと、図７〜図８の如くである。つまり、
傾斜加熱炉（焼結炉）１の円筒型マッフル２の外周に加
熱ヒータなどの加熱部３と当該加熱部３を外側から覆っ
た保温部４とを設置し、このマッフル２に、図７に示し
たように、支持棒５により支持されたガラス微粒子体６
を上方から徐々に挿入し、図８に示したように、加熱部
３で所望の焼結を行い、ガラス微粒子体６の下端側から
徐々に収縮させて透明ガラス化させている。2. Description of the Related Art A general sintering process in manufacturing an optical fiber preform is shown in FIGS. That is,
A heating part 3 such as a heater and a heat retaining part 4 covering the heating part 3 from the outside are installed on the outer periphery of a cylindrical muffle 2 of an inclined heating furnace (sintering furnace) 1, and the muffle 2 is shown in FIG. As shown, the glass fine particles 6 supported by the support rods 5.
8 is gradually inserted from above, and as shown in FIG. 8, the desired sintering is performed in the heating unit 3 and gradually contracted from the lower end side of the glass fine particle body 6 to obtain transparent vitrification.
【０００３】この焼結工程において、ガラス微粒子体６
の挿入速度すなわち焼結速度は、加熱温度と加熱部３回
りの温度分布によって決定されるわけであるが、一般
に、高温部のヒートゾーン長さが長ければ（広けれ
ば）、狭いときに比べて、挿入速度を速くしても、任意
の１微粒子が受ける熱量が同一にできるため、焼結時間
を短縮することができる。つまり、生産性の向上を図る
ことができる。In this sintering process, the glass fine particles 6
The insertion speed, that is, the sintering speed, is determined by the heating temperature and the temperature distribution around the heating part 3. Generally, when the length of the heat zone in the high temperature part is long (wide), compared to when it is narrow. Even if the insertion speed is increased, the amount of heat received by any one fine particle can be the same, so that the sintering time can be shortened. That is, productivity can be improved.
【０００４】例えば、上記図７〜図８の傾斜加熱炉１に
おける温度分布を示すと、曲線Ｌ1の如くで、山形の温
度分布の頂部に当たる高温部ヒートゾーンＬ1aの長さは
あまり長くはない。したがって、この傾斜加熱炉１の場
合、あまり挿入速度を速くすることはできず、生産性向
上の点からすると、難点があった。For example, the temperature distribution in the inclined heating furnace 1 shown in FIGS. 7 to 8 is as shown by the curve L 1 , and the length of the high temperature heat zone L 1a corresponding to the top of the mountain-shaped temperature distribution is not very long. Absent. Therefore, in the case of this inclined heating furnace 1, the insertion speed could not be increased so much, and there was a difficulty in terms of productivity improvement.
【０００５】そこで、高温部ヒートゾーンの長さを長く
することが考えられる。このヒートゾーンの長さは、加
熱ヒータ長さやヒータ温度、あるいは保温部の断熱材形
状や材質などによって決定されるわけであるが、本発明
者等が、図９〜図１０に示したように、保温部１４を上
下に長くして大型化したところ、曲線Ｌ2 のような温度
分布が得られ、高温部ヒートゾーンＬ2aの長さもかなり
長くできた。このヒートゾーンＬ2aの長さを、上記図７
〜図８のヒートゾーンＬ1aに比較して約２倍の長さとし
たところ、約２倍の挿入速度が実現でき、焼結時間の大
幅な短縮が可能であった。Therefore, it is possible to increase the length of the high temperature heat zone. The length of the heat zone is determined by the length of the heating heater, the temperature of the heater, the shape and material of the heat insulating material of the heat retaining portion, and as shown in FIGS. When the heat retaining portion 14 was vertically lengthened to be large-sized, a temperature distribution as shown by the curve L 2 was obtained, and the length of the high temperature portion heat zone L 2a could be considerably increased. The length of this heat zone L 2a is set as shown in FIG.
As compared with the heat zone L 1a shown in FIG. 8, the length was about twice as long. As a result, about twice as much insertion speed could be realized and the sintering time could be greatly shortened.
【０００６】[0006]
【発明が解決しようとする課題】ところが、上記図９〜
図１０のように保温部１４を大型化した加熱炉１にあっ
ては、次のような問題があった。つまり、ガラス微粒子
体６の支持棒５の接続された上端部６ａまでを無駄なく
光ファイバ母材の有効部として焼結しようとする場合、
支持棒５の下端部（ガラス微粒子体６との接続部）５ａ
部分も高温で加熱してしまうこととなる。この支持棒
（ダミーロッド）５は、一般に石英ガラス製からなり、
この加熱によって粘度が下がってガラス微粒子体６を支
えきれなくなったりするなどの問題があった。また、こ
の支持棒５は、製造コストの観点から繰り返して再使用
する方が好ましいわけであるが、上記のように繰り返し
高温下に晒されると、強度が低下するなどの問題が生
じ、寿命が短くなるなどの問題もあった。However, the above-mentioned FIG. 9-
The heating furnace 1 in which the heat insulating portion 14 is enlarged as shown in FIG. 10 has the following problems. That is, when it is attempted to sinter up to the upper end portion 6a of the glass fine particle body 6 to which the support rod 5 is connected as an effective portion of the optical fiber preform without waste,
Lower end portion of support rod 5 (connection portion with glass fine particle body 6) 5a
The part will also be heated at a high temperature. The support rod (dummy rod) 5 is generally made of quartz glass,
Due to this heating, there was a problem that the viscosity was lowered and it became impossible to support the glass fine particles 6. Further, it is preferable that the supporting rod 5 is repeatedly reused from the viewpoint of manufacturing cost, but when repeatedly exposed to a high temperature as described above, there arises a problem such as a decrease in strength and the life thereof is shortened. There were also problems such as shortening.
【０００７】本発明は、このような従来の問題点に鑑み
てなされたもので、焼結がガラス微粒子体の上端部に達
したとき、保温部の上方の一部を離間除去するなどし
て、傾斜加熱炉のヒートゾーン長さを調整するようにし
た光ファイバ母材の製造方法を提供せんとするものであ
る。The present invention has been made in view of such conventional problems, and when sintering reaches the upper end portion of the glass fine particle body, a portion above the heat retaining portion is removed by separation. An object of the present invention is to provide a method for manufacturing an optical fiber preform in which the length of a heat zone of an inclined heating furnace is adjusted.
【０００８】[0008]
【課題を解決するための手段】つまり、かゝる本発明
は、傾斜加熱炉中に支持棒により支持されたガラス微粒
子体を徐々に挿入して焼結し透明ガラス化する光ファイ
バ母材の製造方法において、前記傾斜加熱炉のヒートゾ
ーン長さを調整して焼結することを特徴とする光ファイ
バ母材の製造方法にある。That is, the present invention is directed to an optical fiber preform for gradually vitrifying glass fine particles supported by a supporting rod in an inclined heating furnace and sintering the glass fine particles. In the manufacturing method, there is provided a method for manufacturing an optical fiber preform characterized in that the length of the heat zone of the inclined heating furnace is adjusted and sintering is performed.
【０００９】[0009]
【作用】このヒートゾーン長さの調整により、焼結処理
の高速化とガラス微粒子体支持棒の良好な保護が図られ
る。By adjusting the length of the heat zone, the sintering process can be sped up and the glass fine particle support rod can be well protected.
【００１０】[0010]
【実施例】図１〜図４は、本発明に係る光ファイバ母材
の製造方法の一実施例を示したものである。この方法で
用いる傾斜加熱炉（焼結炉）１１は、中心の円筒型マッ
フル１２の外周に上下２段（３段以上とすることも可）
の部分から構成される大型の保温部２４を設置してあ
り、この保温部２４の下段保温部２４ａの上方寄りの内
側には、加熱ヒータなどの加熱部１３を設けてある。一
方、保温部２４の上段保温部２４ｂにあっては、図１に
示したように、２分割（３分割以上も可）できるように
なっている。すなわち、保温時にはマッフル１２外周に
組み合わせ密着させ、この保温解除の際には、マッフル
１２外周から分割離間させるようになっている。1 to 4 show an embodiment of a method for manufacturing an optical fiber preform according to the present invention. The inclined heating furnace (sintering furnace) 11 used in this method has two upper and lower stages (three or more stages are possible) on the outer periphery of the central cylindrical muffle 12.
A large-sized heat retaining portion 24 composed of the above portion is installed, and a heating portion 13 such as a heater is provided inside the lower heat retaining portion 24a of the heat retaining portion 24 in the upper side. On the other hand, the upper heat retaining portion 24b of the heat retaining portion 24 can be divided into two (three or more divisions possible) as shown in FIG. That is, when the temperature is kept warm, the outer circumference of the muffle 12 is combined and brought into close contact with it.
【００１１】このような保温部２４を有する傾斜加熱炉
１１を用いて、本発明方法を実施するには、先ず、図２
に示したように、保温部２４の分割された上段保温部２
４ｂを組み合わせて下段保温部２４ａ上に重ね合わせ、
この状態で加熱部１３によりマッフル１２内を加熱す
る。そうすると、当該加熱炉１１の温度分布は、曲線Ｌ
3 に示した如くで、長い高温部ヒートゾーンＬ3aが得ら
れる。この温度分布の炉内マッフル１２中に支持棒１５
により支持されたガラス微粒子体１６を上方から徐々に
挿入する。このときの挿入速度は、上記のようにヒート
ゾーンＬ3aが長いことから、速い速度で行うことができ
る。In order to carry out the method of the present invention using the inclined heating furnace 11 having such a heat retaining section 24, first, referring to FIG.
As shown in FIG.
4b are combined and overlapped on the lower heat insulation part 24a,
In this state, the heating part 13 heats the inside of the muffle 12. Then, the temperature distribution of the heating furnace 11 is the curve L
As shown in FIG. 3 , a long high temperature heat zone L 3a is obtained. Support rods 15 in the muffle 12 in the furnace having this temperature distribution
The glass particle body 16 supported by is gradually inserted from above. Since the heat zone L 3a is long as described above, the insertion speed at this time can be high.
【００１２】上記挿入により、図３に示したように、ガ
ラス微粒子体１６の下端側から徐々に収縮して透明ガラ
ス化される。By the above insertion, as shown in FIG. 3, the glass fine particles 16 are gradually shrunk from the lower end side to be transparent vitrified.
【００１３】この透明ガラス化処理が進行して、ガラス
微粒子体１６の透明ガラス化がその上端部１６ａに達す
る直前あるいは直後に、図４に示したように、保温部２
４の上段保温部２４ｂを２分割して、マッフル１２の外
周から離間させる。そうすると、この加熱炉１１の上方
部分の保温機能が解除されるため、この部分の温度が急
速に低下する。すなわち、当該加熱炉１１の温度分布
は、図４の曲線曲線Ｌ3 ′のように、上方部分に温度低
下ゾーンＬ3bが現れ、その分だけ高温部ヒートゾーンＬ
3aが短くなる。したがって、支持棒１５の下端部（ガラ
ス微粒子体１６との接続部）１５ａが過度に加熱される
ことがなくなり、ガラス微粒子体１６の落下などもな
く、全ガラス微粒子体１６の透明ガラス化がスムーズに
行われる。この結果、迅速な透明ガラス化処理と、過剰
加熱から支持棒を保護するという両目的が無理なく達成
される。Immediately before or after the transparent vitrification treatment progresses and the vitrification of the glass fine particles 16 reaches the upper end portion 16a thereof, as shown in FIG.
The upper heat retaining portion 24b of No. 4 is divided into two and separated from the outer periphery of the muffle 12. Then, the heat retaining function of the upper portion of the heating furnace 11 is released, so that the temperature of this portion rapidly decreases. That is, in the temperature distribution of the heating furnace 11, the temperature lowering zone L 3b appears in the upper part as shown by the curved line L 3 ′ in FIG.
3a becomes shorter. Therefore, the lower end portion (connection portion with the glass fine particle body 16) 15a of the support rod 15 is not excessively heated, the glass fine particle body 16 does not drop, and the transparent vitrification of all the glass fine particle bodies 16 is smooth. To be done. As a result, both the purpose of rapid transparent vitrification and the protection of the support rod from overheating are reasonably achieved.
【００１４】このような傾斜加熱炉１１における高温部
ヒートゾーンの長さ調整にあたっては、上記上段保温部
２４ｂのように分割離間する場合に限定されず、例えば
図５に示したように、上段保温部２４ｂ（一体型、分割
型を問わず）を上方に退避させて摺動離間させる方法と
することもできる。さらには、図６に示したように、上
段保温部２４ｂ中に保温機能を損なうことのない、冷却
媒体（ガスや液体などの）の循環通路（図示省略）を設
け、やはりガラス微粒子体１６の透明ガラス化がその上
端部１６ａに達する直前あるいは直後に、媒体供給管１
７ａと媒体排気管１７ｂにより上記循環通路に冷却媒体
を供給して、傾斜加熱炉１１の上方部分に温度低下ゾー
ンを作るようにすることも可能である。The adjustment of the length of the high temperature heat zone in the inclined heating furnace 11 is not limited to the case where the upper heat retaining portion 24b is divided and separated, and the upper heat retaining portion is, for example, as shown in FIG. It is also possible to adopt a method in which the portion 24b (regardless of integrated type or divided type) is retracted upward and slidably separated. Further, as shown in FIG. 6, a circulation passage (not shown) for a cooling medium (such as a gas or a liquid) that does not impair the heat retaining function is provided in the upper heat retaining portion 24b. Immediately before or after the transparent vitrification reaches the upper end 16a thereof, the medium supply pipe 1
It is also possible to supply a cooling medium to the circulation passage by means of 7a and the medium exhaust pipe 17b to form a temperature lowering zone in the upper portion of the inclined heating furnace 11.
【００１５】因に、従来の高温部ヒートゾーンに対して
約２倍の長さの高温部ヒートゾーンを有する傾斜加熱炉
を用いて、本発明方法を実施したところ、従来炉におけ
るガラス微粒子体の挿入速度が１００ｍｍ／ｈｒのと
き、本発明方法では１８０ｍｍ／ｈｒの挿入速度が得ら
れた。Incidentally, when the method of the present invention was carried out using an inclined heating furnace having a high temperature part heat zone having a length about twice as long as that of the conventional high temperature part heat zone, the glass particulate matter in the conventional furnace was When the insertion speed was 100 mm / hr, the method of the present invention achieved an insertion speed of 180 mm / hr.
【００１６】なお、上記実施例で示したガラス微粒子体
１６は、外付け法により製造され、上端のみならず、下
端にも短い支持棒１５ｂを有するものであったが、本発
明はこのようなガラス微粒子体１６に限定されるもので
はない。ＶＡＤ法によって製造され、上端のみに支持棒
１５を有するものであってもよい。The glass fine particle body 16 shown in the above-mentioned embodiment was manufactured by the external attachment method and had the short supporting rod 15b not only at the upper end but also at the lower end. It is not limited to the glass fine particle body 16. It may be manufactured by the VAD method and have the support bar 15 only on the upper end.
【００１７】[0017]
【発明の効果】このように本発明によれば、傾斜加熱炉
中に支持棒により支持されたガラス微粒子体を徐々に挿
入して焼結し透明ガラス化する光ファイバ母材の製造方
法において、前記傾斜加熱炉のヒートゾーン長さを調整
して焼結することができるため、（１）先ず、焼結処理
の高速化が図れる。つまり、焼結時間の大幅な短縮によ
り優れた生産性が得られる。（２）次に、このヒートゾ
ーン長さの調整による加熱炉上方部分の温度低下によっ
て、ガラス微粒子体の支持棒が過度に加熱されることが
なくなるため、焼結中におけるガラス微粒子体の落下な
どのトラブルも未然に防止される。また、上記温度低下
によって、支持棒の保護が図られるため、支持棒の再使
用が何ら問題なくでき、支持棒の大幅な長寿命化が図ら
れる。As described above, according to the present invention, in the method for producing an optical fiber preform in which the glass fine particles supported by the supporting rods are gradually inserted into the inclined heating furnace and sintered to form vitrified glass, Since it is possible to sinter by adjusting the length of the heat zone of the gradient heating furnace, (1) first, the sintering process can be speeded up. In other words, excellent productivity can be obtained by greatly shortening the sintering time. (2) Next, because the temperature of the upper part of the heating furnace is lowered by adjusting the length of the heat zone, the supporting rod of the glass fine particles is prevented from being excessively heated. The trouble of is prevented beforehand. Further, since the support rod is protected by the temperature decrease, the support rod can be reused without any problem, and the life of the support rod can be significantly extended.
【図１】本発明に係る光ファイバ母材の製造方法を実施
するための傾斜加熱炉の概略を示した部分分解斜視図で
ある。FIG. 1 is a partially exploded perspective view schematically showing an inclined heating furnace for carrying out a method for manufacturing an optical fiber preform according to the present invention.
【図２】本発明に係る光ファイバ母材の製造方法におけ
るガラス微粒子体の挿入時を示した部分縦断面図であ
る。FIG. 2 is a partial vertical cross-sectional view showing the state of inserting glass fine particles in the method for producing an optical fiber preform according to the present invention.
【図３】本発明に係る光ファイバ母材の製造方法におけ
るガラス微粒子体の透明ガラス化処理時を示した部分縦
断面図である。FIG. 3 is a partial vertical cross-sectional view showing a time of transparent vitrification treatment of glass fine particles in the method for producing an optical fiber preform according to the present invention.
【図４】本発明に係る光ファイバ母材の製造方法におけ
る加熱炉のヒートゾーン長さ調整時を示した部分縦断面
図である。FIG. 4 is a partial vertical cross-sectional view showing the time of adjusting the heat zone length of the heating furnace in the method for manufacturing an optical fiber preform according to the present invention.
【図５】本発明に係る光ファイバ母材の製造方法におけ
る加熱炉のヒートゾーン長さの別の調整態様を示した部
分分解斜視図である。FIG. 5 is a partially exploded perspective view showing another mode of adjusting the heat zone length of the heating furnace in the method for producing an optical fiber preform according to the present invention.
【図６】本発明に係る光ファイバ母材の製造方法におけ
る加熱炉のヒートゾーン長さのさらに別の調整態様を示
した部分分解斜視図である。FIG. 6 is a partially exploded perspective view showing still another mode of adjusting the heat zone length of the heating furnace in the method for producing an optical fiber preform according to the present invention.
【図７】従来の光ファイバ母材の製造方法におけるガラ
ス微粒子体の挿入時を示した部分縦断面図である。FIG. 7 is a partial vertical cross-sectional view showing a state of inserting glass fine particles in a conventional method for producing an optical fiber preform.
【図８】図７の光ファイバ母材の製造方法におけるガラ
ス微粒子体の透明ガラス化処理時を示した部分縦断面図
である。8 is a partial vertical cross-sectional view showing a transparent vitrification treatment of glass fine particles in the method for producing an optical fiber preform shown in FIG. 7.
【図９】従来の他の光ファイバ母材の製造方法における
ガラス微粒子体の挿入時を示した部分縦断面図である。FIG. 9 is a partial vertical cross-sectional view showing the state of inserting glass fine particles in another conventional method for producing an optical fiber preform.
【図１０】図９の光ファイバ母材の製造方法におけるガ
ラス微粒子体の透明ガラス化処理時を示した部分縦断面
図である。FIG. 10 is a partial vertical cross-sectional view showing a transparent vitrification treatment of glass fine particles in the method for producing an optical fiber preform shown in FIG.
１１ 傾斜加熱炉 １２ マッフル １３ 加熱部 １５ 支持棒 １６ ガラス微粒子体 １６ａ ガラス微粒子体の上端部 ２４ 保温部 ２４ａ 下段保温部 ２４ｂ 上段保温部 Ｌ3 温度分布曲線 Ｌ3a 高温部ヒートゾーン Ｌ3b 温度低下ゾーン11 Inclined Heating Furnace 12 Muffle 13 Heating Part 15 Supporting Rod 16 Glass Fine Particles 16a Upper Part of Glass Fine Particles 24 Insulation 24a Lower Insulation 24b Upper Insulation L 3 Temperature Distribution Curve L 3a High Temperature Heat Zone L 3b Temperature Reduction Zone
Claims (3)
ガラス微粒子体を徐々に挿入して焼結し透明ガラス化す
る光ファイバ母材の製造方法において、前記傾斜加熱炉
のヒートゾーン長さを調整して焼結することを特徴とす
る光ファイバ母材の製造方法。1. A method for producing an optical fiber preform in which a glass particulate material supported by a supporting rod is gradually inserted into a tilted heating furnace to be sintered into a transparent glass, wherein the length of the heat zone of the tilted heating furnace is increased. A method for manufacturing an optical fiber preform, which comprises adjusting and sintering.
整するにおいて、加熱炉のマッフル外周に設置した保温
部の一部を分割離間させることを特徴とする請求項１記
載の光ファイバ母材の製造方法。2. The optical fiber preform according to claim 1, wherein in adjusting the heat zone length of the inclined heating furnace, a part of the heat retaining portion installed on the outer periphery of the muffle of the heating furnace is divided and separated. Manufacturing method.
整するにおいて、加熱炉のマッフル外周に設置した保温
部の一部を摺動離間させることを特徴とする請求項１記
載の光ファイバ母材の製造方法。3. The optical fiber mother board according to claim 1, wherein in adjusting the heat zone length of the inclined heating furnace, a part of the heat retaining portion installed on the outer periphery of the muffle of the heating furnace is slid apart. Method of manufacturing wood.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22320592A JPH0648760A (en) | 1992-07-30 | 1992-07-30 | Production of performed material for optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22320592A JPH0648760A (en) | 1992-07-30 | 1992-07-30 | Production of performed material for optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0648760A true JPH0648760A (en) | 1994-02-22 |
Family
ID=16794443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22320592A Pending JPH0648760A (en) | 1992-07-30 | 1992-07-30 | Production of performed material for optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0648760A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006056755A (en) * | 2004-08-23 | 2006-03-02 | Furukawa Electric Co Ltd:The | Method for producing optical fiber preform |
| CN111620557A (en) * | 2020-05-26 | 2020-09-04 | 华能(泰安)光电科技有限公司 | Sintering device and method for loose body of optical fiber preform rod |
| CN113548795A (en) * | 2020-04-24 | 2021-10-26 | 株式会社藤仓 | Sintering device for porous glass body |
-
1992
- 1992-07-30 JP JP22320592A patent/JPH0648760A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006056755A (en) * | 2004-08-23 | 2006-03-02 | Furukawa Electric Co Ltd:The | Method for producing optical fiber preform |
| JP4609839B2 (en) * | 2004-08-23 | 2011-01-12 | 古河電気工業株式会社 | Optical fiber preform manufacturing method |
| CN113548795A (en) * | 2020-04-24 | 2021-10-26 | 株式会社藤仓 | Sintering device for porous glass body |
| CN111620557A (en) * | 2020-05-26 | 2020-09-04 | 华能(泰安)光电科技有限公司 | Sintering device and method for loose body of optical fiber preform rod |
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