JPS63236729A - Production of chalcogenide glass fiber having core clad structure - Google Patents
Production of chalcogenide glass fiber having core clad structureInfo
- Publication number
- JPS63236729A JPS63236729A JP6810587A JP6810587A JPS63236729A JP S63236729 A JPS63236729 A JP S63236729A JP 6810587 A JP6810587 A JP 6810587A JP 6810587 A JP6810587 A JP 6810587A JP S63236729 A JPS63236729 A JP S63236729A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- crucible
- rod
- tube
- chalcogenide glass
- 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
- 239000000835 fiber Substances 0.000 title claims abstract description 37
- 239000005387 chalcogenide glass Substances 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000011521 glass Substances 0.000 claims abstract description 59
- 238000009987 spinning Methods 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000011261 inert gas Substances 0.000 claims abstract description 16
- 230000009477 glass transition Effects 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000005253 cladding Methods 0.000 claims description 7
- 238000004031 devitrification Methods 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000011347 resin Substances 0.000 description 13
- 229920005989 resin Polymers 0.000 description 13
- 239000003365 glass fiber Substances 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical group [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910052711 selenium Inorganic materials 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000075 oxide glass Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/022—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from molten glass in which the resultant product consists of different sorts of glass or is characterised by shape, e.g. hollow fibres, undulated fibres, fibres presenting a rough surface
- C03B37/023—Fibres composed of different sorts of glass, e.g. glass optical fibres, made by the double crucible technique
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/80—Non-oxide glasses or glass-type compositions
- C03B2201/86—Chalcogenide glasses, i.e. S, Se or Te glasses
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は赤外透過性に優れたコア−クラッド構造を有す
るカルコゲナイドガラスファイバーの製造方法に関する
。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing a chalcogenide glass fiber having a core-clad structure with excellent infrared transparency.
［従来の技術］
カルコゲナイドガラスは赤外透過性及び耐候性に優れた
赤外ファイバー用材料であって、既に数多くのガラス組
成が報告されている（例えばＺ、 Ｕ。[Prior Art] Chalcogenide glass is a material for infrared fibers with excellent infrared transparency and weather resistance, and many glass compositions have already been reported (for example, Z, U, etc.).
Ｂｏｒｉｓｏｖａ、Ｇｌａｓｓｙ Ｓｅｍ１ｃｏｎｄ
ｕｃｔｏｒ Ｐｌｅｎｕｍｐｒｅｓｓ。Borisova, Glassy Sem1cond
uctor Plenumpress.
Ｎｅｗ Ｙｏｒｋ、１９８１ ）。これらのカルコゲナ
イドガラス組成の中で、波長１０μ−付近、すなわち炭
酸ガスレーザー光線の波長領域の光を低損失で透過し得
るものは、Ｔｅの含有量が５０モル％以上であるＧｅ−
３ｅ−Ｔｅ系であって、そのファイバー化が検討されて
いる（例えば、勝山俊夫、松村宏善、電子通信学会全国
大会（昭和６０年３月）予稿集ｐ４−２５６）。New York, 1981). Among these chalcogenide glass compositions, those that can transmit light in the wavelength range of around 10μ, that is, in the wavelength range of carbon dioxide laser beams, with low loss are Ge-glasses with a Te content of 50 mol% or more.
3e-Te system, and its fiberization is being considered (for example, Toshio Katsuyama, Hiroyoshi Matsumura, Proceedings of the Institute of Electronics and Communication Engineers National Conference (March 1985) p4-256).
しかし、Ｔｅ含有量の高いガラスファイバーは機械的強
度が低いため、樹脂コーティング等による補強をしなけ
れば実用性に乏しい。ところが、波長１０μｍ付近は各
種樹脂材料の指紋領域であるため、その波長領域の赤外
線を吸収する。従って、このような樹脂材料をカルコゲ
ナイドガラスファイバーの外周に直接コーティングする
ことはできない。However, glass fibers with a high Te content have low mechanical strength, so they are of little practical use unless they are reinforced with a resin coating or the like. However, since the wavelength around 10 μm is the fingerprint region of various resin materials, infrared rays in that wavelength region are absorbed. Therefore, it is not possible to directly coat the outer periphery of chalcogenide glass fibers with such a resin material.
この問題点はカルコゲナイドガラスファイバーをコア−
クラッドの二重構造にした後、その外周を樹脂でコーテ
ィングすることによって解決される。コア−クラッド構
造を有するガラスファイバーの製造法としては、二重ル
ツボ法が知られている（金森照寿等、電気通信研究所、
研究実用化報告、３２（１９８３）、２７３７ ）。こ
の方法はコアとなるガラスを内側のルツボに、クラッド
となるガラスを外側のルツボにそれぞれ挿入して溶融し
、二重ルツボの底部に設けた紡糸ノズルから両ガラスを
同時に押し出してファイバーとするものである。しかし
、上記したようにＴｅ含有量が５０モル％と高いカルコ
ゲナイドガラス系は、結晶化に対する熱的安定性が低い
ために、またＡｓ及びｓｅ等の蒸気圧が高い成分を含む
カルコゲナイドガラス系は、高温状態でのガラス成分の
蒸発によって組成変動が起るために、上に述べた二重ル
ツボ法では２アークラツド構造のカルコゲナイドガラス
ファイバーを定常的に製造することが困難である。This problem is solved by using chalcogenide glass fiber as the core.
This problem can be solved by creating a double clad structure and then coating the outer periphery with resin. The double crucible method is known as a method for producing glass fibers with a core-clad structure (Teruhisa Kanamori et al., Telecommunications Research Institute,
Research Practical Report, 32 (1983), 2737). This method involves inserting the core glass into an inner crucible and the cladding glass into an outer crucible, melting them, and simultaneously extruding both glasses from a spinning nozzle installed at the bottom of the double crucible to form fibers. It is. However, as mentioned above, chalcogenide glass systems with a high Te content of 50 mol% have low thermal stability against crystallization, and chalcogenide glass systems that contain components with high vapor pressure such as As and se, Since compositional fluctuations occur due to evaporation of glass components at high temperatures, it is difficult to regularly produce chalcogenide glass fibers with a two-arc clad structure using the double crucible method described above.
このほか、コア−クラッド構造を有するガラスファイバ
ーの製造方法として、クラッドとなるチューブ状のガラ
スの中にコアとなるＯラド状のガラスを挿入し、その先
端部を溶融紡糸するロッドインチューブ法が、石英ガラ
スファイバーの製造に従来から利用されている。しかし
、カルコゲナイドガラスは、僅かな温度変化でも粘度が
著しく変動するうえ、その紡糸は非酸化性雰囲気で行な
わなければならないため、ロッドインチューブ法をその
ままカルコゲナイドガラスファイバーの製造に利用する
ことはできない。In addition, as a manufacturing method for glass fiber with a core-clad structure, there is a rod-in-tube method in which a core O-rad-shaped glass is inserted into a tube-shaped glass cladding, and its tip is melt-spun. , traditionally used in the production of quartz glass fibers. However, the viscosity of chalcogenide glass fluctuates significantly even with slight temperature changes, and its spinning must be carried out in a non-oxidizing atmosphere, so the rod-in-tube method cannot be used as is for producing chalcogenide glass fibers.
［発明が解決しようとする問題点］
上記したように、従来のロッドインチューブ法や二重ル
ツボ法をそのままカルコゲナイドガラスに適用しても、
紡糸中にガラスの酸化や失透を伴うために、所望の赤外
透過性ガラスファイバーを得ることができない。本発明
はカルコゲナイドガラスを紡糸する際に懸念される酸化
や失透の問題を払拭して、カルコゲナイドガラスから赤
外透過性に優れたコア−クラッド構造のファイバーを製
造可能ならしめる新しいガラスファイバー製造法を提供
する。[Problems to be solved by the invention] As mentioned above, even if the conventional rod-in-tube method or double crucible method is directly applied to chalcogenide glass,
Since glass oxidation and devitrification occur during spinning, the desired infrared transparent glass fiber cannot be obtained. The present invention is a new glass fiber manufacturing method that eliminates the problems of oxidation and devitrification that are a concern when spinning chalcogenide glass, and makes it possible to manufacture fibers with a core-clad structure with excellent infrared transparency from chalcogenide glass. I will provide a.
［問題点を解決するための手段］
本発明に係るガラスファイバー製造法は、下部に紡糸ノ
ズルを有する円筒形二重ルツボの内側ルツボにカルコゲ
ナイドガラスロッドを、外側ルツボに該ガラスロッドよ
りも屈折率が低いカルコゲナイドガラスチューブをそれ
ぞれ挿入し、ルツボ内部及びルツボ外部を不活性ガス雰
囲気に保持し、紡糸ノズル近傍のチューブ及びロッドの
みをガラス転移温度よりも高い温度に加熱しながらガラ
スチューブとガラスロッドを同時にルツボの紡糸ノズル
から引き出してコア−クラッド構造を有するカルコゲナ
イドガラスファイバーを得ることからなる。[Means for Solving the Problems] The glass fiber manufacturing method according to the present invention includes a cylindrical double crucible having a spinning nozzle at the bottom, a chalcogenide glass rod in the inner crucible, and a chalcogenide glass rod in the outer crucible having a refractive index higher than that of the glass rod. Insert a chalcogenide glass tube with a low temperature, maintain the inside and outside of the crucible in an inert gas atmosphere, and heat only the tube and rod near the spinning nozzle to a temperature higher than the glass transition temperature. At the same time, a chalcogenide glass fiber having a core-clad structure is obtained by drawing it out from the spinning nozzle of the crucible.
［作 用］
本発明の方法に於いて、紡糸ノズル近傍に位置するガラ
スチューブ及びガラスロッドを加熱するに際しては、予
め二重ルツボ内部及びルツボ外周のノズル近辺を不活性
ガスにて充分置換しておくことが望ましい。この置換が
不充分であると、ガラスチューブ及びガラスロッドが加
熱時に水蒸気や酸素で９蝕されることがあるからである
。加熱は二重ルツボ内部及びルツボの紡糸ノズル近傍を
不活性ガス雰囲気に保持し、紡糸ノズル近傍に位置する
ガラスチューブ及びガラスロッドに対して局部的に行な
われ、これらがガラス転移温度以上に加熱されて流動化
した後は、ルツボ内のガス圧及び／又はガラスチューブ
及びガラスロッドに加えられる荷重によって直ちに紡糸
される。従って、紡糸工程中にガラスが酸素で侵される
ことがなく、また、ファイバーが切断されることもない
。そしてまた、長時間ガラス転移温度以上の温度にさら
されることがないので、ガラスに失透が生ずる心配もな
い。[Function] In the method of the present invention, when heating the glass tube and glass rod located near the spinning nozzle, the inside of the double crucible and the vicinity of the nozzle on the outer periphery of the crucible are sufficiently replaced with inert gas in advance. It is desirable to leave it there. If this replacement is insufficient, the glass tube and glass rod may be corroded by water vapor and oxygen during heating. Heating is performed by keeping the interior of the double crucible and the vicinity of the spinning nozzle of the crucible in an inert gas atmosphere, and locally heating the glass tube and glass rod located near the spinning nozzle, so that these are heated to a temperature higher than the glass transition temperature. After being fluidized, the material is immediately spun by the gas pressure in the crucible and/or the load applied to the glass tube and glass rod. Therefore, the glass is not attacked by oxygen during the spinning process, and the fibers are not cut. Furthermore, since the glass is not exposed to temperatures above the glass transition temperature for a long period of time, there is no fear that the glass will devitrify.
加熱温度はガラスチューブ及びガラスロッドを１０３〜
１０８ポイズの範囲の粘度に保持できる温度域であるこ
とが好ましい。ガラスの粘度が１０３ボイスより低くな
ると、両ガラスの失透傾向が増大したり、得られるファ
イバーの真円度が低下することがある。また、ガラスの
粘度が１０８ポイズより高い場合は、ガラスが粘性流動
しにくくなるため、紡糸に要するルツボ内圧及び／又は
荷重を増大しなければならず、このためにファイバー径
の制御が困難になるうえ、紡糸に際しての線引き速度が
遅くなり、生産性が低下する。The heating temperature is 103~ for glass tubes and glass rods.
It is preferable that the temperature range is such that the viscosity can be maintained within the range of 108 poise. When the viscosity of the glass is lower than 103 voices, the tendency of both glasses to devitrify increases, and the circularity of the resulting fiber may decrease. Furthermore, if the viscosity of the glass is higher than 108 poise, the glass becomes difficult to viscous flow, so the crucible internal pressure and/or load required for spinning must be increased, which makes it difficult to control the fiber diameter. Moreover, the drawing speed during spinning becomes slow, resulting in a decrease in productivity.
紡糸ノズルの近傍に位置するガラスチューブとガラスロ
ッドは上記の温度域に加熱され、紡糸ノズルから同時に
紡糸される。この場合、ガラスチューブ及びガラスロッ
ドに格別荷重をかけなくても、それぞれの自重のみで紡
糸することができるが、加熱温度に於けるガラスチュー
ブ及びガラス０ツドの粘度が異なる場合は、その粘度差
に応じて内側ルツボの内圧と外側ルツボの内圧をそれぞ
れ不活性ガスにて加圧することにより、また粘度差がな
い場合は、内側ルツボの内圧と外側ルツボの内圧を同じ
圧力に不活性ガスで加圧することにより、紡糸温度を下
げ、紡糸に際してのガラスの失透を抑制することができ
る。しかし、その場合でも不活性ガス圧力は５ｋ（Ｊ／
ｉ以下、好ましくは０．１〜３ｋＭｃｄの範囲とすべき
であって、５ ｋａ／ｄを越える過剰加圧はファイバー
径の制御を困難にし、ファイバーの真円度を低下させる
。The glass tube and glass rod located near the spinning nozzle are heated to the above temperature range, and are simultaneously spun from the spinning nozzle. In this case, the glass tube and the glass rod can be spun using their own weight alone without applying any special load, but if the viscosity of the glass tube and the glass rod at the heating temperature is different, the viscosity difference By pressurizing the internal pressure of the inner crucible and the internal pressure of the outer crucible with inert gas, depending on the By applying pressure, the spinning temperature can be lowered and devitrification of the glass can be suppressed during spinning. However, even in that case, the inert gas pressure is 5k (J/
i, preferably in the range of 0.1 to 3 kMcd; excessive pressure exceeding 5 ka/d makes it difficult to control the fiber diameter and reduces the circularity of the fiber.
また、加熱温度に於けるガラスチューブ及びガラスロッ
ドの粘度が著しく異なる場合及び得られるファイバーの
コア径とクラツド径の比率を厳密に制御したい場合には
、ガラスチューブ及びガラスロッドの上端にそれぞれ独
立の荷重を加えることが有効である。しかし、余り荷重
をかけ過ぎるとガラスチューブやガラスロッドが破壊さ
れる虞れがあり、ファイバー径の制御も困難になるので
、荷重の上限は１０ｋ（＋／ｌｉ程度とすることが適当
である。In addition, if the viscosity of the glass tube and glass rod at the heating temperature is significantly different, or if you want to strictly control the ratio of the core diameter to the cladding diameter of the resulting fiber, it is possible to separate It is effective to apply a load. However, if too much load is applied, there is a risk that the glass tube or glass rod may be destroyed, and control of the fiber diameter becomes difficult, so it is appropriate that the upper limit of the load be about 10 k(+/li).
［実施例１
次に本発明の方法を実施例に基づいてさらに詳細に説明
する。[Example 1] Next, the method of the present invention will be explained in more detail based on an example.
実施例１
第１図に示した構成の装置を使用して、本発明の方法に
従いコア−クラッド構造を有するカルコゲナイドガラス
ファイバーを製造した。Example 1 A chalcogenide glass fiber having a core-clad structure was manufactured according to the method of the present invention using an apparatus having the configuration shown in FIG.
まず、フランジ１８の部分で装置の上部を下部から取り
はずし、Ｇｅ：２５モル％、 Ｓｅ：１３モル％、 Ｔ
ｅ：６０モル％、 Ｔｌ：２モル％の組成で、直径９．
５＃、長さ １２０Ｉ１ｍ＋＋のコア用ガラスロッド３
と、Ｇｅ：２４モル％、 Ｓｅ：１６モル％、 Ｔｅ：
６０モル％の組成で、内径１３Ｉ１ｍ１外径１７．５Ｉ
１ｍ、長さ １２０ａｍのクラッド用ガラスチューブ４
を、第１図に示すように、底部に紡糸ノズルを備えた二
重ルツボの内側ルツボ１及び外側ルツボ２の中にそれぞ
れ垂直に収容した。First, the upper part of the device was removed from the lower part at the flange 18, and Ge: 25 mol%, Se: 13 mol%, T
Composition: e: 60 mol%, Tl: 2 mol%, diameter: 9.
5#, length 120I1m++ core glass rod 3
, Ge: 24 mol%, Se: 16 mol%, Te:
Composition of 60 mol%, inner diameter 13I1m1 outer diameter 17.5I
1m, length 120am glass tube for cladding 4
were vertically housed in an inner crucible 1 and an outer crucible 2 of a double crucible equipped with a spinning nozzle at the bottom, as shown in FIG.
ガラスロッド３には５ｋｇ／ｃｄの荷１ｍ−Ａを、ガラ
スチューブ４には２０ｋｇ／ ｃｉの荷重−Ｂを加えた
後、耐圧ゴムチューブ１６及びゴムパツキン１１を介し
てフランジ１８を閉じ、二重ルツボの内部及びその外周
をアルゴンガスで充分置換した。After applying a load of 1 m-A of 5 kg/cd to the glass rod 3 and a load of 20 kg/ci to the glass tube 4, the flange 18 was closed via the pressure-resistant rubber tube 16 and the rubber packing 11, and the double crucible was closed. The inside and the outer periphery of the tank were sufficiently replaced with argon gas.
その後、二重ルツボ内への不活性ガス人ロア及び８を閉
じ、二重ルツボの紡糸ノズル近傍のみを局部的に加熱で
きるヒーター１１を徐々に２８５℃まで昇温する。この
昇温によってルツボ内のガラスチューブとガラスロッド
の先端は流動化するので、不活性ガスにて内側ルツボ１
内を０．５ｋＭｃｄに、また外側ルツボ２内を０．８に
！ＩＩ／ ｃＩｉに加圧し、流動化したガラスチューブ
とガラスロッドをルツボ底部の紡糸ノズルから同時に引
き出した。こうして得られたファイバーを直ちにコータ
ー１２に導いて紫外線硬化型樹脂１３をファイバーにコ
ーティングした後、紫外線ランプ１４にて樹脂を硬化さ
せることにより、コア径４２０μ―、クラツド径５５０
μｍ。Thereafter, the inert gas lower door 8 into the double crucible is closed, and the temperature of the heater 11, which can locally heat only the vicinity of the spinning nozzle of the double crucible, is gradually raised to 285°C. This temperature rise fluidizes the tips of the glass tube and glass rod inside the crucible, so the inside crucible 1 is heated with inert gas.
Inside crucible 2 to 0.5kMcd and outside crucible 2 to 0.8! Pressure was applied to II/cIi, and the fluidized glass tube and glass rod were simultaneously pulled out from the spinning nozzle at the bottom of the crucible. The fiber thus obtained is immediately introduced into the coater 12 to coat the fiber with an ultraviolet curing resin 13, and then the resin is cured with an ultraviolet lamp 14 to form a core with a diameter of 420μ and a cladding with a diameter of 550μ.
μm.
樹脂コーティング厚３０μｍ、長さ２０ｍのカルコゲナ
イドガラスファイバーを得た。このファイバーの透過損
失値の波長依存性を第２図に示す。また、ファイバーの
ガラス組成、紡糸条件及び最低透過損失値をまとめて第
１表に示す。A chalcogenide glass fiber with a resin coating thickness of 30 μm and a length of 20 m was obtained. FIG. 2 shows the wavelength dependence of the transmission loss value of this fiber. Further, the glass composition of the fiber, spinning conditions, and minimum transmission loss value are summarized in Table 1.
実施例２〜４
ガラス組成及び紡糸条件を第１表に示すごとく変更した
以外は実施例１と同様な方法でコア−クラッド型カルコ
ゲナイドガラスファイバーをｍ賀した。各ファイバー径
、紡糸条件、最低透過損値及びその波長を第１表に示す
。Examples 2 to 4 Core-clad chalcogenide glass fibers were prepared in the same manner as in Example 1, except that the glass composition and spinning conditions were changed as shown in Table 1. Table 1 shows each fiber diameter, spinning conditions, minimum transmission loss value, and its wavelength.
比較例１．２
実施例１及び４でコアに用いたガラスロッドのみを第１
図に示す装置の内側ルツボ１に入れ、ガラスチューブを
使用しなかった以外は実施例１と同様な方法で樹脂クラ
ッドファイバーを製造した。Comparative Example 1.2 Only the glass rod used for the core in Examples 1 and 4 was used as the first
A resin clad fiber was produced in the same manner as in Example 1 except that the fiber was placed in the inner crucible 1 of the apparatus shown in the figure and the glass tube was not used.
この場合の紡糸条件及びファイバー径も第１表に示す。The spinning conditions and fiber diameter in this case are also shown in Table 1.
また、比較例１で得られた樹脂クラッドファイバーの透
過損失値の波長依存性を第２図に示す。第２図から明ら
かな通り、樹脂クラッドファイバーは、波長５〜１１μ
Ｉの領域で樹脂による吸収が生じているため、透過損失
値は５ ｄＢ／ａ＋程度増加した。Further, the wavelength dependence of the transmission loss value of the resin clad fiber obtained in Comparative Example 1 is shown in FIG. As is clear from Figure 2, the resin clad fiber has a wavelength of 5 to 11μ.
Since absorption by the resin occurred in the region I, the transmission loss value increased by about 5 dB/a+.
［効 果］
本発明の方法によれば、結晶化に対して安定でないため
に、従来のロッドインチューブ法や二重ルツボ法では製
造が不可能であったコア−クラッド型カルコゲナイドガ
ラスファイバーを、ガラスの酸化や失透を伴わずに製造
することができる。[Effects] According to the method of the present invention, core-clad chalcogenide glass fibers, which could not be produced by conventional rod-in-tube methods or double crucible methods, because they are not stable against crystallization, can be produced by It can be manufactured without oxidation or devitrification of glass.
そして、コア−クラッド型カルコゲナイドガラスファイ
バーは、これに樹脂をコーティングしても赤外透過性が
損われることがないので、本発明の方法はカルコゲナイ
ドガラスファイバーの実用性を高めるうえで極めて有益
である。Furthermore, since the core-clad type chalcogenide glass fiber does not lose its infrared transmittance even if it is coated with resin, the method of the present invention is extremely useful in increasing the practicality of chalcogenide glass fiber. .
第１図は本発明の実施例で使用したファイバー製造装置
の概略断面図である。第２図は実施例１及び比較例１で
得たガラスファイバーの透過損失値の波長依存性を示す
グラフである。
１：内側ルツボ ２：外側ルツボ３：コア用ガ
ラスロッド
４：クラッド用ガラスチューブ
５：荷重−Ａ ６：荷弔−Ｂ７：内側ルツ
ボ加圧用不活性ガス入口
８：外側ルツボ加圧用不活性ガス入口
９ニルツボ外周雰囲気制御用不活性ガス人ロ１０ニルツ
ボ外周雰囲気制御用不活性ガス出口１１：局部加熱用ヒ
ーター １２：コーター１３：紫外線硬化型樹脂 １
４：紫外線ランプ１５ニブリントローラー １６：耐
圧ゴムチューブ１７：ゴムパツキン １８：フラ
ンジ非酸化物ガラス研究開発株式会社
代 理 人 朝 倉 正 幸第２図
波長（μｍ）FIG. 1 is a schematic cross-sectional view of a fiber manufacturing apparatus used in an example of the present invention. FIG. 2 is a graph showing the wavelength dependence of the transmission loss values of the glass fibers obtained in Example 1 and Comparative Example 1. 1: Inner crucible 2: Outer crucible 3: Glass rod for core 4: Glass tube for cladding 5: Load-A 6: Load-B7: Inert gas inlet for pressurizing inner crucible 8: Inert gas inlet for pressurizing outer crucible 9 Inert gas for controlling the atmosphere around the nil acupoint 10 Inert gas outlet for controlling the atmosphere around the nil acupoint 11: Heater for local heating 12: Coater 13: Ultraviolet curing resin 1
4: Ultraviolet lamp 15 Niblin troller 16: Pressure-resistant rubber tube 17: Rubber gasket 18: Flange Non-oxide Glass Research and Development Co., Ltd. Agent Masayuki Asakura Figure 2 Wavelength (μm)
Claims (1)
ルツボにカルコゲナイドガラスロッドを、外側ルツボに
該ガラスロッドよりも屈折率が低いカルコゲナイドガラ
スチューブをそれぞれ挿入し、ルツボ内部及びルツボ外
部を不活性ガス雰囲気に保持し、紡糸ノズル近傍のチュ
ーブ及びロッドのみをガラス転移温度よりも高い温度に
加熱しながらガラスチューブとガラスロッドを同時にル
ツボの紡糸ノズルから引き出すことを特徴とするコア−
クラッド構造を有するカルコゲナイドガラスファイバー
の製造方法。 ２ チューブ及びロッドの加熱温度がこれらを１０＾３
〜１０＾８ポイズの粘度に保持できる温度であることを
特徴とする特許請求の範囲第１項記載の方法。 ３ ルツボ内のチューブ及びロッドを加熱するに際して
、内側ルツボ内及び外側ルツボ内をそれぞれ独立に不活
性ガスにて加圧することを特徴とする特許請求の範囲第
１項記載の方法。 ４ ルツボ内の不活性ガスの圧力が５ｋｇ／ｃｍ＾２以
下であることを特徴とする特許請求の範囲第３項記載の
方法。 ５ ルツボ内のチューブ及びロッドを加熱するに際して
、チューブ及びロッドの上端にそれぞれ荷重をかけるこ
とを特徴とする特許請求の範囲第１項又は第３項記載の
方法。 ６ チューブ及びロッドの上端にかける荷重が１０ｋｇ
／ｃｍ＾２以下であることを特徴とする特許請求の範囲
第５項記載の方法。[Scope of Claims] 1 A chalcogenide glass rod is inserted into the inner crucible of a cylindrical double crucible having a spinning nozzle at the bottom, and a chalcogenide glass tube having a lower refractive index than the glass rod is inserted into the outer crucible, and the inside of the crucible and A core characterized in that the outside of the crucible is maintained in an inert gas atmosphere, and the glass tube and glass rod are simultaneously pulled out from the spinning nozzle of the crucible while heating only the tube and rod near the spinning nozzle to a temperature higher than the glass transition temperature. −
A method for producing a chalcogenide glass fiber having a cladding structure. 2 The heating temperature of the tube and rod is 10^3
The method according to claim 1, characterized in that the temperature is such that the viscosity can be maintained at a viscosity of ~10^8 poise. 3. The method according to claim 1, wherein when heating the tube and rod in the crucible, the inside of the inner crucible and the inside of the outer crucible are independently pressurized with an inert gas. 4. The method according to claim 3, wherein the pressure of the inert gas in the crucible is 5 kg/cm^2 or less. 5. The method according to claim 1 or 3, characterized in that when heating the tube and rod in the crucible, a load is applied to the upper ends of the tube and rod, respectively. 6 The load applied to the upper end of the tube and rod is 10 kg.
6. The method according to claim 5, characterized in that it is less than /cm^2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6810587A JPS63236729A (en) | 1987-03-24 | 1987-03-24 | Production of chalcogenide glass fiber having core clad structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6810587A JPS63236729A (en) | 1987-03-24 | 1987-03-24 | Production of chalcogenide glass fiber having core clad structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63236729A true JPS63236729A (en) | 1988-10-03 |
| JPH0527577B2 JPH0527577B2 (en) | 1993-04-21 |
Family
ID=13364126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6810587A Granted JPS63236729A (en) | 1987-03-24 | 1987-03-24 | Production of chalcogenide glass fiber having core clad structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63236729A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0842907A1 (en) * | 1996-11-19 | 1998-05-20 | CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A. | Active single mode optical fibres and method for their fabrication |
| EP0975553A4 (en) * | 1996-08-12 | 2000-02-02 | Us Navy | Process for making optical fibers from core and cladding glass rods |
| US6802189B2 (en) | 1999-12-30 | 2004-10-12 | Schott Glas | Device and process for the remelting of glass |
-
1987
- 1987-03-24 JP JP6810587A patent/JPS63236729A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0975553A4 (en) * | 1996-08-12 | 2000-02-02 | Us Navy | Process for making optical fibers from core and cladding glass rods |
| EP0975553A1 (en) * | 1996-08-12 | 2000-02-02 | THE GOVERNMENT OF THE UNITED STATES OF AMERICA, as represented by THE SECRETARY OF THE NAVY | Process for making optical fibers from core and cladding glass rods |
| EP0842907A1 (en) * | 1996-11-19 | 1998-05-20 | CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A. | Active single mode optical fibres and method for their fabrication |
| US5991486A (en) * | 1996-11-19 | 1999-11-23 | Cselt- Centro Studi E Laboratori Telecomunicazioni S.P.A. | Active single mode optical fibres and method for their fabrication |
| US6802189B2 (en) | 1999-12-30 | 2004-10-12 | Schott Glas | Device and process for the remelting of glass |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0527577B2 (en) | 1993-04-21 |
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