JP3715159B2 - Spinning furnace for optical fiber production - Google Patents

Spinning furnace for optical fiber production Download PDF

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Publication number
JP3715159B2
JP3715159B2 JP33622699A JP33622699A JP3715159B2 JP 3715159 B2 JP3715159 B2 JP 3715159B2 JP 33622699 A JP33622699 A JP 33622699A JP 33622699 A JP33622699 A JP 33622699A JP 3715159 B2 JP3715159 B2 JP 3715159B2
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Prior art keywords
optical fiber
fiber material
tube
ceramic tube
spinning
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JP2001151530A (en
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宏幸 中崎
幸男 野口
操 白岩
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Olympus Corp
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Olympus Corp
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    • 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
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/60—Optical fibre draw furnaces
    • C03B2205/70—Draw furnace insulation

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  • 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)
  • Light Guides In General And Applications Therefor (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば酸溶出法によるイメージバンドル（光学繊維束）の製造において三重素線を紡糸する際に用いられる光学繊維製造用紡糸炉に関する。
【０００２】
【従来の技術】
従来、酸溶出法によるイメージバンドル（光学繊維束）の製造において三重素線を紡糸する際に用いられる光学繊維製造用紡糸炉としては、図２に示すように、円筒状のセラミック管１００の中央外周部に空隙１０１を介し、セラミック管１００に沿って発熱体１０２を約１００ｍｍにわたって配設し、空隙１０１に臨む以外の発熱体１０２の外周を断熱体１０３で覆っているものが知られている。
【０００３】
このようなセラミック管１００を介して光学繊維材料１０４を加熱するのは、発熱体１０２や断熱体１０３などから発生する塵から光学繊維材料１０４を保護するためである。なお、１０５はセラミック管１００の周囲温度を検出する熱電対である。
【０００４】
この光学繊維製造用紡糸炉は、セラミック管１００の上方より、コアロッド、クラッド管及び酸溶出管を組合せた光学繊維材料１０４を垂直に吊るしてセラミック管１００内に降下させ、発熱体１０２で加熱することにより軟化させ（コアロッド、クラッド管及び酸溶出管が融着する程度の状態をいう）、下方に設けた一対のローラ（不図示）で細くなった光学繊維材料１０４を挟持しながら引張って三重素線１０６を製造する際に用いられる。
【０００５】
【発明が解決しようとする課題】
従来の技術においては、光学繊維材料１０４がセラミック管１００中で発熱体１０２に対向する加熱幅が広くて光学繊維材料１０４の軟化幅が長いため、光学繊維材料１０４の軟化融着部分の長さｄが上下方向に長くなり、コアロッドとクラッド管の隙間が紡糸中にうまく埋まらず残ってしまうため、この隙間が泡となって三重素線１０６内に巻き込まれ、不良品になってしまうという問題点を有していた。
また、光学繊維材料１０４の軟化幅が長く、外的な影響を受け易い軟化融着部分ｄの範囲が長くなるため、三重素線１０６の線径のばらつきが大きくなるという問題点を有していた。
【０００６】
なお、加熱幅を狭くして局所加熱しようとしても、発熱体１０２を構成する発熱線の寿命は、線径、ピッチ、温度によって決まってしまうため、発熱体１０２の輻射熱をセラミック管１００を介して光学繊維材料１０４に与えて加熱する方法では、限度があった。
【０００７】
本発明は、従来の技術が有するこのような問題点に鑑みてなされたものであり、その目的とするところは、紡糸時に不安定となる軟化部分を極力少なくし、素線内への泡の巻き込み及び素線の線径のばらつきを少なくすることが出来る光学繊維製造用紡糸炉を提供しようとするものである。
【０００８】
【課題を解決するための手段】
上記課題を解決すべく本発明は、セラミック管の周囲に発熱体を配設し、光学繊維材料を軟化融着させながら素線を製造する光学繊維製造用紡糸炉において、前記セラミック管に石英窓を設け、前記発熱体からの輻射熱を前記石英窓を介して前記光学繊維材料に与えるものである。
【０００９】
また、前記セラミック管を上部セラミック管と下部セラミック管に分割し、これら上部セラミック管と下部セラミック管の間に筒状の石英管を設けて前記石英窓を形成してもよい。
【００１０】
［作用］
発熱体の輻射熱が石英窓を介して局所的に直接光学繊維材料に与えられるので、発熱体の光学繊維材料に対向する寸法を小さく出来、更に光学繊維材料の軟化幅が従来よりも狭くなるため、光学繊維材料の軟化融着部分の長さが短くなる。
【００１１】
【発明の実施の形態】
以下に本発明の実施例を添付図面に基づいて説明する。ここで、図１は本発明に係る光学繊維製造用紡糸炉で紡糸中の縦断面図である。
【００１２】
図１に示すように、本発明の光学繊維製造用紡糸炉１においては、上部に配設するつば付きセラミックチューブ２と下部に配設するセラミックチューブ３の間に筒状の透明石英管４を設けることで、図２に示す従来のセラミック管１００に相当する部分を形成している。そして、透明石英管４の外周面に対向する位置に空隙５を介して発熱体６を配設し、空隙５に臨む以外の発熱体６の外周を断熱体７で覆い、更に発熱体６や断熱体７等をケーシング８に収めている。
【００１３】
なお、９は透明石英管４の周囲温度を検出する熱電対である。また、加熱の対象となる光学繊維材料１０は、コアロッド１１、クラッド管１２及び酸溶出管１３を組合せたものである。
【００１４】
このように、発熱体６が対向する部分を従来のセラミック管に替えて透明石英管４にしたことによって、発熱体６の輻射熱がより直接的に光学繊維材料１０に到達するので、熱効率が良く、炉心の最高温度を下げずに局所加熱が可能になる。
【００１５】
光学繊維製造用紡糸炉１を用いて光学繊維を紡糸するには、先ず材料チャック治具１４で光学繊維材料１０の後端を把持して光学繊維材料１０を垂直に吊るす。次いで、光学繊維材料１０の先端をつば付きセラミックチューブ２の上方より、つば付きセラミックチューブ２の中に降下させる。
【００１６】
光学繊維材料１０の先端が、透明石英管４に囲まれた炉内に降下すると、発熱体６の輻射熱が透明石英管４を介して局所的に直接光学繊維材料１０に与えられる。すると、光学繊維材料１０の先端が軟化して細くなる。
【００１７】
更に、透明石英管４から外れた位置まで降下すると温度が軟化温度より低くなるため細くなった先端が凝固する。その凝固した先端がセラミックチューブ３の下方に配置され、所定の回転速度で回転する一対のローラ１５に挟持されることによって、下方に引張られる。
【００１８】
このような光学繊維材料１０に対する紡糸炉１による軟化及び一対のローラ１５による引張り動作が定常的に繰返されることによって、所望の線径を有する三重素線１６が連続的に製造される。なお、１７は三重素線１６の線径測定用センサである。
【００１９】
コアロッド１１とクラッド管１２との隙間が軟化融着によって紡糸中に速やかに埋まるので、泡がコアロッド１１とクラッド管１２との間に残り難くい。更に、光学繊維材料１０の軟化融着部分が短いので、外的な影響を受け難い。
【００２０】
また、コアロッド１１、クラッド管１２及び酸溶出管１３を組合せた光学繊維材料１０のような複合材ではない、単体のロッドを熱延伸させて素線を得る場合や、コアロッド１１とクラッド管１２を紡糸する場合などにも、本発明の光学繊維製造用紡糸炉１を適用出来、素線の線径精度の向上に寄与する。
【００２１】
この発明は以下の形態によっても把握できる。
【００２２】
請求項１に記載の光学繊維製造用紡糸炉において、前記セラミック管は上部セラミック管と下部セラミック管に分割され、これら上部セラミック管と下部セラミック管の間に筒状の石英管を設けて前記石英窓を形成した光学繊維製造用紡糸炉である。
【００２３】
【発明の効果】
以上説明したように本発明によれば、セラミック管に石英窓を設けたことで、発熱体の輻射熱を局所的に直接光学繊維材料に与えることが可能となるので、光学繊維材料の加熱幅を狭くすることが出来、光学繊維材料の軟化幅が狭くて光学繊維材料の軟化融着部分が短くなり、素線内に巻き込まれる泡が少なくなる。
また、光学繊維材料の軟化融着部分が短くなることで、外的な影響を受ける範囲が狭くなって、安定した紡糸が可能となり、素線の線径のばらつきが小さくなる。
【図面の簡単な説明】
【図１】本発明に係る光学繊維製造用紡糸炉で紡糸中の縦断面図
【図２】従来の光学繊維製造用紡糸炉で紡糸中の縦断面図
【符号の説明】
１ 光学繊維製造用紡糸炉
２ つば付きセラミックチューブ（上部セラミック管）
３ セラミックチューブ（下部セラミック管）
４ 透明石英管（石英窓）
６ 発熱体
７ 断熱体
８ ケーシング
９ 熱電対
１０ 光学繊維材料
１１ コアロッド
１２ クラッド管
１３ 酸溶出管
１５ ローラ
１６ 三重素線
１７ 線径測定用センサ。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spinning furnace for producing optical fibers used for spinning triple strands in the production of image bundles (optical fiber bundles) by, for example, an acid elution method.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a spinning furnace for producing optical fibers used when spinning triple strands in the production of an image bundle (optical fiber bundle) by an acid elution method, as shown in FIG. 2, the center of a cylindrical ceramic tube 100 is used. It is known that a heating element 102 is disposed about 100 mm along the ceramic tube 100 through the gap 101 on the outer peripheral portion, and the outer circumference of the heating element 102 other than facing the gap 101 is covered with a heat insulator 103. .
[0003]
The reason why the optical fiber material 104 is heated through the ceramic tube 100 is to protect the optical fiber material 104 from dust generated from the heating element 102, the heat insulator 103, and the like. Reference numeral 105 denotes a thermocouple that detects the ambient temperature of the ceramic tube 100.
[0004]
In this optical fiber manufacturing spinning furnace, from above the ceramic tube 100, an optical fiber material 104, which is a combination of a core rod, a clad tube, and an acid elution tube, is vertically suspended, lowered into the ceramic tube 100, and heated by a heating element 102. The optical fiber material 104 is softened (refers to a state where the core rod, the clad tube, and the acid elution tube are fused), and the optical fiber material 104 that is thinned by a pair of rollers (not shown) provided below is pulled and triple-folded. It is used when manufacturing the strand 106.
[0005]
[Problems to be solved by the invention]
In the prior art, the optical fiber material 104 has a wide heating width facing the heating element 102 in the ceramic tube 100 and the softening width of the optical fiber material 104 is long. d becomes longer in the vertical direction, and the gap between the core rod and the clad pipe is not filled well during spinning, and this gap becomes a bubble and is caught in the triple strand 106, resulting in a defective product. Had a point.
Moreover, since the softening width of the optical fiber material 104 is long and the range of the softened and fused portion d that is susceptible to external influences becomes long, there is a problem that the variation in the wire diameter of the triple strand 106 becomes large. It was.
[0006]
Even if the heating width is narrowed and local heating is attempted, the life of the heating wire constituting the heating element 102 is determined by the wire diameter, pitch, and temperature, so that the radiant heat of the heating element 102 is transmitted through the ceramic tube 100. There is a limit in the method of heating by applying to the optical fiber material 104.
[0007]
The present invention has been made in view of such problems of the prior art, and the object of the present invention is to minimize the softened portion that becomes unstable during spinning and to prevent bubbles from entering into the strands. It is an object of the present invention to provide a spinning furnace for producing optical fibers that can reduce the variation in winding and wire diameter.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides an optical fiber manufacturing spinning furnace in which a heating element is disposed around a ceramic tube, and an optical fiber material is softened and fused to manufacture a strand. The radiant heat from the heating element is applied to the optical fiber material through the quartz window.
[0009]
The ceramic tube may be divided into an upper ceramic tube and a lower ceramic tube, and a cylindrical quartz tube may be provided between the upper ceramic tube and the lower ceramic tube to form the quartz window.
[0010]
[Action]
Since the radiant heat of the heating element is directly applied directly to the optical fiber material through the quartz window, the size of the heating element facing the optical fiber material can be reduced, and the softening width of the optical fiber material becomes narrower than before. The length of the softened and fused portion of the optical fiber material is shortened.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a longitudinal sectional view during spinning in the spinning furnace for producing optical fibers according to the present invention.
[0012]
As shown in FIG. 1, in a spinning furnace 1 for producing optical fibers of the present invention, a cylindrical transparent quartz tube 4 is provided between a ceramic tube 2 with a collar disposed at the upper portion and a ceramic tube 3 disposed at the lower portion. By providing, a portion corresponding to the conventional ceramic tube 100 shown in FIG. 2 is formed. Then, a heating element 6 is disposed through a gap 5 at a position facing the outer peripheral surface of the transparent quartz tube 4, and the outer periphery of the heating element 6 other than facing the gap 5 is covered with a heat insulating body 7. A heat insulator 7 or the like is housed in the casing 8.
[0013]
Reference numeral 9 denotes a thermocouple for detecting the ambient temperature of the transparent quartz tube 4. The optical fiber material 10 to be heated is a combination of the core rod 11, the clad tube 12 and the acid elution tube 13.
[0014]
As described above, the transparent quartz tube 4 is used instead of the conventional ceramic tube at the portion where the heat generating member 6 faces, so that the radiant heat of the heat generating member 6 reaches the optical fiber material 10 more directly. Local heating is possible without lowering the maximum temperature of the core.
[0015]
In order to spin an optical fiber using the optical fiber manufacturing spinning furnace 1, first, the optical fiber material 10 is suspended vertically by holding the rear end of the optical fiber material 10 with the material chuck jig 14. Next, the tip of the optical fiber material 10 is lowered into the collared ceramic tube 2 from above the collared ceramic tube 2.
[0016]
When the tip of the optical fiber material 10 is lowered into the furnace surrounded by the transparent quartz tube 4, the radiant heat of the heating element 6 is locally applied directly to the optical fiber material 10 through the transparent quartz tube 4. Then, the tip of the optical fiber material 10 is softened and thinned.
[0017]
Furthermore, when the temperature falls below the position where the transparent quartz tube 4 is removed, the temperature becomes lower than the softening temperature, so that the thinned tip is solidified. The solidified tip is disposed below the ceramic tube 3 and is pulled downward by being sandwiched between a pair of rollers 15 rotating at a predetermined rotational speed.
[0018]
By repeatedly repeating such softening of the optical fiber material 10 by the spinning furnace 1 and pulling operation by the pair of rollers 15, a triple strand 16 having a desired wire diameter is continuously manufactured. Reference numeral 17 denotes a sensor for measuring the diameter of the triple strand 16.
[0019]
Since the gap between the core rod 11 and the cladding tube 12 is quickly filled during spinning by softening and fusion, bubbles are unlikely to remain between the core rod 11 and the cladding tube 12. Furthermore, since the softened and fused portion of the optical fiber material 10 is short, it is hardly affected by external influences.
[0020]
In addition, when the core rod 11, the clad tube 12 and the acid elution tube 13 are not a composite material such as the optical fiber material 10, a single rod is thermally stretched to obtain a strand, or the core rod 11 and the clad tube 12 are In the case of spinning, for example, the spinning furnace 1 for producing optical fibers of the present invention can be applied, which contributes to improvement of the wire diameter accuracy of the strands.
[0021]
The present invention can also be grasped by the following modes.
[0022]
2. The spinning furnace for producing an optical fiber according to claim 1, wherein the ceramic tube is divided into an upper ceramic tube and a lower ceramic tube, and a cylindrical quartz tube is provided between the upper ceramic tube and the lower ceramic tube. This is a spinning furnace for producing optical fibers having a window.
[0023]
【The invention's effect】
As described above, according to the present invention, by providing the quartz window in the ceramic tube, it becomes possible to locally apply the radiant heat of the heating element directly to the optical fiber material. The optical fiber material can be narrowed, the softening width of the optical fiber material is narrowed, the softened and fused portion of the optical fiber material is shortened, and the number of bubbles entrained in the strand is reduced.
In addition, since the softened and fused portion of the optical fiber material is shortened, the range of external influence is narrowed, stable spinning is possible, and the variation in the wire diameter of the strands is reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view during spinning in a spinning furnace for producing optical fibers according to the present invention. FIG. 2 is a longitudinal sectional view during spinning in a conventional spinning furnace for producing optical fibers.
1 Optical fiber production spinning furnace 2 Brim ceramic tube (upper ceramic tube)
3 Ceramic tube (lower ceramic tube)
4 Transparent quartz tube (quartz window)
6 Heating element 7 Heat insulator 8 Casing 9 Thermocouple 10 Optical fiber material 11 Core rod 12 Clad tube 13 Acid elution tube 15 Roller 16 Triple strand 17 Wire diameter measuring sensor.

Claims (1)

セラミック管の周囲に発熱体を配設し、光学繊維材料を軟化融着させながら素線を製造する光学繊維製造用紡糸炉において、前記セラミック管に石英窓を設け、前記発熱体からの輻射熱を前記石英窓を介して前記光学繊維材料に与えることを特徴とする光学繊維製造用紡糸炉。In a spinning furnace for producing optical fibers, in which a heating element is arranged around a ceramic tube and the optical fiber material is softened and fused, a quartz window is provided in the ceramic tube to radiate heat from the heating element. A spinning furnace for producing optical fibers, which is provided to the optical fiber material through the quartz window.
JP33622699A 1999-11-26 1999-11-26 Spinning furnace for optical fiber production Expired - Lifetime JP3715159B2 (en)

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Application Number Priority Date Filing Date Title
JP33622699A JP3715159B2 (en) 1999-11-26 1999-11-26 Spinning furnace for optical fiber production

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Application Number Priority Date Filing Date Title
JP33622699A JP3715159B2 (en) 1999-11-26 1999-11-26 Spinning furnace for optical fiber production

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JP3715159B2 true JP3715159B2 (en) 2005-11-09

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