JP3905256B2 - Method and apparatus for heating and stretching glass rod - Google Patents

Method and apparatus for heating and stretching glass rod Download PDF

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Publication number
JP3905256B2
JP3905256B2 JP22226399A JP22226399A JP3905256B2 JP 3905256 B2 JP3905256 B2 JP 3905256B2 JP 22226399 A JP22226399 A JP 22226399A JP 22226399 A JP22226399 A JP 22226399A JP 3905256 B2 JP3905256 B2 JP 3905256B2
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Prior art keywords
glass rod
outer diameter
heating
stretching
light receiving
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JP2001048558A (en
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二郎 森谷
佳昌 清水
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Shin Etsu Chemical Co Ltd
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Shin Etsu Chemical Co Ltd
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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
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
    • C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
    • C03B37/0124—Means for reducing the diameter of rods or tubes by drawing, e.g. for preform draw-down
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/04—Re-forming tubes or rods
    • C03B23/047—Re-forming tubes or rods by drawing

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、ガラス旋盤を用いて石英ガラスプリフォームをバーナーで加熱し、所望の外径に延伸する、ガラス棒の加熱延伸方法及びその装置に関する。
【０００２】
【従来の技術】
通信・光学用として使用されるガラス棒を作製する手段として、ＣＶＤ法、ＶＡＤ法、ＯＶＤ法などが知られており、これらの手段で作製されたガラス棒は、その後、必要に応じて加熱延伸され、所望の寸法に縮径される。
従来のガラス棒の加熱延伸方法を、図４、図５を用いて説明する。図４は、ガラス棒加熱延伸装置の模式的な概略説明図であり、図５は、図４の装置に配設された、ガラス棒の外径測定器近傍の模式的な部分斜視図である。
図において、ガラス棒Ａは、ガラス旋盤に装備されている一対の回転チャック１１、１２間に、その両端で支持され、矢印Ｒ方向へ回転する。
【０００３】
移動台１４は、ガラス棒Ａの長手方向に沿って往復動自在で、モータＭ１からの動力伝達を受けて矢印Ｘ１方向へ移動し、その際、ガラス棒Ａは、移動台１４に備えられたバーナー１５により加熱される。
回転チャック１１は定置型であるが、回転チャック１２は、回転チャック移動台１６上に搭載された移動型で、モータＭ２からの動力伝達を受けて回転チャック移動台１６とともに矢印Ｘ２の方向へ移動する。
【０００４】
ガラス棒Ａはバーナー１５により加熱され、回転チャック１２が矢印Ｘ２方向へ移動することにより、ガラス棒Ａの加熱溶融部Ｙに矢印Ｘ２方向への張力がかかり、ガラス棒Ａは延伸される。
ガラス棒Ａを所定の径に延伸するには、延伸前にガラス棒Ａの径測定を行った後、加熱し、ガラス棒Ａの一端から順次、予め測定して得た径の太さに応じて、回転チャック１２を矢印Ｘ２方向へ移動することにより、長手方向に沿って一定の径を有するガラス棒Ａが得られる。
【０００５】
【発明が解決しようとする課題】
外径測定器１７は、図５に示すように、測定光を発する発光部１７ａと受光部１７ｂとの間にガラス棒Ａを配置し、発光部１７ａから矢印方向に出射したレーザ光は受光部１７ｂで受光されるが、発光部１７a 及び受光部１７b は高熱環境下では測定精度が低減するため、一般的には、耐熱仕様の測定器でも雰囲気温度は５０℃以下であることが望ましい。
しかし、近年のプリフォーム（ガラス棒）の大型化にともない、加熱用バーナー１５の火炎１９の強度が増し、この輻射熱が外径測定器１７を高熱の雰囲気に曝させる原因となっている。
【０００６】
外径測定器１７が高熱の雰囲気で加熱され高熱化した場合、測定器を冷却すれば測定は可能になるが、高熱と冷却を繰り返すと測定精度が低下するため、外径測定器に冷却設備を設けることが望まれる。しかしながらガラス旋盤の設備の大きさや、外径測定器が常時移動するものであるため、これに冷却設備を設けることは難しく、有効な対策が講じられていない。
【０００７】
ガラス棒Ａを加熱する際、バーナー１５の火炎１９が外径測定器１７の発光部１７a と受光部１７bに侵入するのを防ぐために、発光部１７a及び受光部１７bとバーナー１５との間に遮熱板１８ａ，１８ｂを設ける方法（公開昭６２−１０８７４３号公報）が知られているが、プリフォームの大型化に伴う火炎強度の増大により、遮熱板１８ａ，１８ｂの板面に設けられた、レーザー光用の外径測定孔２０ａ，２０ｂから侵入する火炎１９の輻射熱で、外径測定器１７の発光部１７a及び受光部１７bが熱せられるため、高熱化防止の実効が上がっていない。
従って、本発明の課題は、石英ガラス母材を加熱延伸してプリフォームとする石英ガラス母材の加熱延伸時の火炎の輻射熱による外径測定器の高熱化を防止し、延伸終了後直ちに、ガラス棒の外径測定を高精度に行うことができる改善された方法及び装置を提供することにある。
【０００８】
【課題を解決するための手段】
上記問題を解決すべく鋭意検討した結果、外径測定器が高温になる原因は、外径測定器１７におけるレーザー光の発光部１７ａ及び受光部１７ｂへの火炎防止用遮熱板１８ａ,１８ｂのレーザー光用の外径測定孔２０ａ,２０ｂを通して侵入するバーナーの輻射熱が、発光部１７a 及び受光部１７b に達して外径測定器１７に悪影響を与えることが判明した。
【０００９】
そこで、本発明のガラス棒加熱延伸方法では、図２，図３に示すように、外径測定器４の発光部４a及び受光部４bとガラス棒Aの加熱延伸部との間に配置されるそれぞれの遮熱板６ａ，６ｂに形成された外径測定孔５ａ，５ｂを、この測定孔に設けられた開閉自在のシャッター７により外径測定時にのみ開いて、延伸されたガラス棒の外径を測定し、延伸条件を制御することにある。この方法は、ガラス棒の延伸時のみならず、火炎によるガラス棒の曲り修正やファイヤーポリッシュなどの全ての火炎加工に対して有効である。
なお、図３において、外径測定器４の受光部及び受光部側に設けられる遮熱板、シャッター７は図示を省略した。
【００１０】
また、本発明のガラス棒の加熱延伸装置は、ガラス棒をその両端部で保持し、該ガラス棒をこの軸の回りに回転させる機構に連結されたガラス棒把持手段、該ガラス棒の軸方向に沿って移動可能なガラス棒加熱手段、ガラス棒を軸方向に牽引する牽引手段及び牽引され延伸したガラス棒の外径を測定するレーザー光の発光部と受光部からなる外径測定手段を備え、ガラス棒加熱手段と外径測定手段の前記発光部および受光部との間に、ガラス棒の外径測定孔が形成された遮熱板をそれぞれ配置し、該外径測定孔に開閉自在のシャッターを設け、これらのシャッターをガラス棒の外径測定時にのみ開放するように機能させている。
【００１１】
【発明の実施の形態】
以下、本発明の実施形態を、実施例に基づき図面を用いてさらに詳細に説明する。
図１は、本発明のガラス棒延伸装置の模式的概略説明図であり、図２は、本発明のガラス棒延伸装置における外径測定器近傍の模式的な部分斜視図であり、図３は、図２を平面図で模式的に示したものである。
【００１２】
本発明のガラス棒加熱延伸装置は、図１〜３に示すように、ガラス棒Ａの両端を、一対の回転チャック１、２間で保持するガラス棒把持手段と、ガラス棒をこの軸回りに一定の速度で回転させながら、ガラス棒Ａを軸方向に沿って連続的にバーナー３で加熱するガラス棒Ａの加熱手段と、加熱されたガラス棒Aを、移動型回転チャック１で軸方向に牽引する牽引手段及びガラス棒Aの外径測定器４の発光部４aから出射したレーザー光を受光部４bにより受光させて測定する外径測定手段を備え、外径測定の対象となるガラス棒Aと発光部４a及び受光部４bとの間に、外径測定孔５ａ，５ｂを有する遮熱板６ａ，６ｂを設け、この外径測定孔５ａ，５ｂに開閉自在のシャッター７を取り付けている。
【００１３】
シャッター７は、図３に示すように外径測定器４に付設されたエアーシリンダー８に接続されたロッド９に取り付けられており、火炎を発生する前に、エアーシリンダー８を開放することにより、シャッター７は、矢印Ｘ３方向に移動して外径測定孔５ａを塞ぎ、火炎１０及びその輻射熱の侵入を阻止するようになっている。
【００１４】
シャッター７の開閉手段は、上記した構成に限定されるものではなく、ガラス棒Aの外径測定時にシャッター７が外径測定孔４を塞ぐことができる構成であれば、どのような構成であってもよい。
シャッター７は、外径測定器４の受光部４a及び発光部４ｂの両方に設置し、出来るだけ遮熱板６ａ，６ｂに近づけて設置するのが好ましく、その材質は耐熱性に優れたセラミックスが望ましい。
【００１５】
シャッター７は、図２のように１枚で形成してもよいが、分割された複数枚の板で形成しても同様な効果が発揮される。また、火炎発生時あるいはその前に、遮熱板６ａ，６ｂの前に外付けのものを設けてもよいが、プログラム制御などで火炎発生時あるいはその前に、確実に閉じられるように制御することが望ましい。
本発明のガラス棒の加熱延伸装置は、上記のように、外径測定孔５ａ，５ｂに、開閉自在のシャッター７を取り付けているため、ガラス棒の延伸直後に、この外径測定器４を用いて高精度に外径測定でき、また、外径測定器４の長期使用に貢献できる。
【００１６】
本発明のガラス棒加熱延伸方法は、上記のような装置を用い、遮熱板６ａ，６ｂの外径測定孔５ａ，５ｂを、この測定孔５ａ，５ｂの近傍に設けた開閉自在のシャッター７により外径測定時にのみ開くようにして延伸されたガラス棒の外径を断続的に測定し、ガラス棒がその長さ方向に沿って一様な外径となるように延伸条件を制御している。
【００１７】
【発明の効果】
本発明によれば、延伸終了後あるいは他の用途での火炎加工時に、遮熱板の外径測定孔からの外径測定器への輻射熱を完全に遮断できるので、外径測定器の高熱化を防ぎ、延伸終了後、直ちに、外径測定器を高精度で使用できる。
【図面の簡単な説明】
【図１】 本発明のガラス棒加熱延伸装置の模式的説明図である。
【図２】 本発明のガラス棒加熱延伸装置における外径測定器近傍の模式的な部分斜視図である。
【図３】 本発明の装置における外径測定器近傍の模式的な平面図である。
【図４】 従来のガラス棒加熱延伸装置の模式的な概略説明図である。
【図５】 従来のガラス棒加熱延伸装置におけるガラス棒の外径測定器近傍の模式的な部分斜視図である。
【符号の説明】
１，２、１１，１２ 回転チャック
４、１７ 外径測定器
４a 、１７a 外径測定器の発光部
４b 、１７b 外径測定器の受光部
５ａ，５ｂ、２０ａ，２０ｂ 外径測定孔
６ａ，6ｂ、１８ａ，１８ｂ 遮熱板
７ シャッター
８ エアーシリンダー
９ ロッド
１０，１９ 火炎
１４ 移動台
１５ バーナー
１６ 回転チャック移動台
Ａ ガラス棒
Ｙ 加熱溶融部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for heating and stretching a glass rod, in which a quartz glass preform is heated with a burner using a glass lathe and stretched to a desired outer diameter.
[0002]
[Prior art]
Known as means for producing glass rods used for communication and optics are CVD methods, VAD methods, OVD methods, etc., and glass rods produced by these means are then heated and stretched as necessary. And reduced in diameter to a desired dimension.
A conventional method for heating and stretching a glass rod will be described with reference to FIGS. FIG. 4 is a schematic schematic explanatory view of the glass rod heating and stretching apparatus, and FIG. 5 is a schematic partial perspective view of the vicinity of the outer diameter measuring instrument of the glass rod arranged in the apparatus of FIG. .
In the figure, the glass rod A is supported at both ends between a pair of rotary chucks 11 and 12 mounted on a glass lathe and rotates in the direction of arrow R.
[0003]
The moving table 14 can reciprocate along the longitudinal direction of the glass rod A, and moves in the direction of the arrow X1 in response to power transmission from the motor M1. At that time, the glass rod A is provided on the moving table 14. Heated by the burner 15.
The rotating chuck 11 is a stationary type, but the rotating chuck 12 is a moving type mounted on the rotating chuck moving table 16 and moves in the direction of the arrow X2 together with the rotating chuck moving table 16 upon receiving power transmission from the motor M2. To do.
[0004]
The glass rod A is heated by the burner 15 and the rotary chuck 12 moves in the direction of the arrow X2, whereby a tension in the direction of the arrow X2 is applied to the heating and melting portion Y of the glass rod A, and the glass rod A is stretched.
In order to stretch the glass rod A to a predetermined diameter, after measuring the diameter of the glass rod A before stretching, the glass rod A is heated and sequentially measured from one end of the glass rod A in accordance with the diameter obtained in advance. Thus, by moving the rotary chuck 12 in the direction of the arrow X2, a glass rod A having a constant diameter along the longitudinal direction is obtained.
[0005]
[Problems to be solved by the invention]
As shown in FIG. 5, the outer diameter measuring instrument 17 has a glass rod A disposed between a light emitting portion 17a that emits measurement light and a light receiving portion 17b, and laser light emitted from the light emitting portion 17a in the direction of the arrow is received by the light receiving portion. Although the light is received at 17b, since the measurement accuracy of the light emitting portion 17a and the light receiving portion 17b is reduced in a high heat environment, it is generally desirable that the ambient temperature is 50 ° C. or less even in a heat-resistant measuring instrument.
However, as the size of preforms (glass rods) in recent years increases, the strength of the flame 19 of the heating burner 15 increases, and this radiant heat causes the outer diameter measuring instrument 17 to be exposed to a hot atmosphere.
[0006]
When the outer diameter measuring instrument 17 is heated and heated in a high-heated atmosphere, the measurement can be performed by cooling the measuring instrument. However, the repeated measurement of high heat and cooling lowers the measurement accuracy. It is desirable to provide However, since the size of the equipment of the glass lathe and the outer diameter measuring instrument are constantly moving, it is difficult to provide cooling equipment for this, and no effective measures have been taken.
[0007]
When the glass rod A is heated, in order to prevent the flame 19 of the burner 15 from entering the light emitting part 17a and the light receiving part 17b of the outer diameter measuring device 17, the light shielding part 17a, the light receiving part 17b and the burner 15 are blocked. A method of providing the hot plates 18a and 18b (Japanese Laid-Open Publication No. 62-108743) is known, but the heat shields 18a and 18b are provided on the plate surfaces due to the increase in flame strength accompanying the increase in size of the preform. Since the light emitting portion 17a and the light receiving portion 17b of the outer diameter measuring device 17 are heated by the radiant heat of the flame 19 entering from the outer diameter measuring holes 20a and 20b for laser light, the effect of preventing high heat is not improved.
Therefore, the problem of the present invention is to prevent the outer diameter measuring device from being heated by the radiant heat of the flame at the time of heating and stretching the quartz glass base material to be preformed by heating and stretching the quartz glass base material. An object of the present invention is to provide an improved method and apparatus capable of measuring the outer diameter of a glass rod with high accuracy.
[0008]
[Means for Solving the Problems]
As a result of intensive investigations to solve the above problems, the cause of the high temperature of the outer diameter measuring device is that the laser light emitting portions 17a and the light receiving portions 17b of the outer diameter measuring device 17 have flame prevention heat shield plates 18a and 18b. It has been found that the radiant heat of the burner entering through the outer diameter measuring holes 20a and 20b for the laser light reaches the light emitting portion 17a and the light receiving portion 17b and adversely affects the outer diameter measuring device 17.
[0009]
Therefore, in the glass rod heating and stretching method of the present invention, as shown in FIGS. 2 and 3, the glass rod A is disposed between the light emitting portion 4 a and the light receiving portion 4 b of the outer diameter measuring instrument 4 and the glass rod A heating and stretching portion. The outer diameter measurement holes 5a and 5b formed in the respective heat shield plates 6a and 6b are opened only at the time of outer diameter measurement by the openable / closable shutter 7 provided in the measurement holes, and the outer diameter of the stretched glass rod. Is to control the stretching conditions. This method is effective not only at the time of extending | stretching a glass rod, but all flame processes, such as correction of the bending of the glass rod by a flame and a fire polish.
In FIG. 3, the light receiving unit and the heat shield plate provided on the light receiving unit side of the outer diameter measuring instrument 4 and the shutter 7 are not shown.
[0010]
Further, the glass rod heating and stretching apparatus of the present invention comprises a glass rod gripping means connected to a mechanism for holding the glass rod at both ends thereof and rotating the glass rod around this axis, and the axial direction of the glass rod. A glass rod heating means movable along the axis, a pulling means for pulling the glass rod in the axial direction, and an outer diameter measuring means comprising a light emitting portion and a light receiving portion for measuring the outer diameter of the drawn and drawn glass rod. , between the light emitting portion and a light receiving portion of the glass rod heating means and the outer diameter measuring means, the heat shield plate having an outer diameter measurement hole is formed in the glass rod were arranged, the opened and closed to the external diameter measurement hole Shutters are provided, and these shutters are made to function only when measuring the outer diameter of the glass rod.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings based on examples.
FIG. 1 is a schematic schematic explanatory view of a glass rod stretching apparatus of the present invention, FIG. 2 is a schematic partial perspective view of the vicinity of an outer diameter measuring instrument in the glass rod stretching apparatus of the present invention, and FIG. FIG. 2 is a schematic plan view of FIG.
[0012]
As shown in FIGS. 1 to 3, the glass rod heating and stretching apparatus of the present invention has a glass rod gripping means for holding both ends of the glass rod A between a pair of rotary chucks 1 and 2, and the glass rod around this axis. The glass rod A is heated by the burner 3 continuously along the axial direction while rotating at a constant speed, and the heated glass rod A is axially moved by the movable rotary chuck 1. The glass rod A is provided with a pulling means for pulling and an outer diameter measuring means for receiving and measuring the laser beam emitted from the light emitting portion 4a of the outer diameter measuring device 4 of the glass rod A by the light receiving portion 4b. Heat shield plates 6a and 6b having outer diameter measuring holes 5a and 5b are provided between the light emitting part 4a and the light receiving part 4b, and an openable / closable shutter 7 is attached to the outer diameter measuring holes 5a and 5b.
[0013]
The shutter 7 is attached to a rod 9 connected to an air cylinder 8 attached to the outer diameter measuring instrument 4 as shown in FIG. 3, and by opening the air cylinder 8 before generating a flame, The shutter 7 moves in the direction of the arrow X3 to close the outer diameter measurement hole 5a, and prevents the flame 10 and its radiant heat from entering.
[0014]
The opening / closing means of the shutter 7 is not limited to the above-described configuration, and any configuration is possible as long as the shutter 7 can block the outer diameter measurement hole 4 when measuring the outer diameter of the glass rod A. May be.
The shutter 7 is preferably installed on both the light-receiving unit 4a and the light-emitting unit 4b of the outer diameter measuring device 4, and is preferably installed as close to the heat shield plates 6a and 6b as possible, and the material is ceramic having excellent heat resistance. desirable.
[0015]
The shutter 7 may be formed as a single sheet as shown in FIG. 2, but the same effect can be achieved even when it is formed of a plurality of divided plates. Further, an external one may be provided in front of the heat shield plates 6a and 6b at the time of or before the occurrence of the flame, but control is performed so as to be surely closed at the time of or before the occurrence of the flame by program control or the like. It is desirable.
Since the glass rod heating and stretching apparatus of the present invention has the openable / closable shutter 7 attached to the outer diameter measuring holes 5a and 5b as described above, the outer diameter measuring device 4 is provided immediately after the stretching of the glass rod. It is possible to measure the outer diameter with high accuracy and to contribute to the long-term use of the outer diameter measuring instrument 4.
[0016]
The glass rod heating and stretching method of the present invention uses the apparatus as described above, and an openable / closable shutter 7 in which the outer diameter measurement holes 5a and 5b of the heat shield plates 6a and 6b are provided in the vicinity of the measurement holes 5a and 5b. Measure intermittently the outer diameter of the glass rod stretched so that it opens only when measuring the outer diameter, and control the stretching conditions so that the glass rod has a uniform outer diameter along its length direction. Yes.
[0017]
【The invention's effect】
According to the present invention, the radiant heat from the outer diameter measuring hole of the heat shield plate to the outer diameter measuring device can be completely blocked after the drawing is finished or during flame processing in other applications, so that the outer diameter measuring device can be heated to a high temperature. The outer diameter measuring instrument can be used with high accuracy immediately after completion of stretching.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view of a glass rod heating and stretching apparatus of the present invention.
FIG. 2 is a schematic partial perspective view of the vicinity of an outer diameter measuring device in the glass rod heating and stretching apparatus of the present invention.
FIG. 3 is a schematic plan view of the vicinity of an outer diameter measuring instrument in the apparatus of the present invention.
FIG. 4 is a schematic explanatory diagram of a conventional glass rod heating and stretching apparatus.
FIG. 5 is a schematic partial perspective view of the vicinity of an outer diameter measuring device of a glass rod in a conventional glass rod heating and stretching apparatus.
[Explanation of symbols]
1, 2, 11, 12 Rotating chucks 4, 17 Outer diameter measuring devices 4a, 17a Light emitting portions 4b, 17b of outer diameter measuring devices Light receiving portions 5a, 5b, 20a, 20b Outer diameter measuring holes 6a, 6b , 18a, 18b Heat shield plate 7 Shutter 8 Air cylinder 9 Rod 10, 19 Flame 14 Moving table 15 Burner 16 Rotating chuck moving table A Glass rod Y Heat melting part

Claims (2)

ガラス棒の両端を保持し回転させながら、所定の外径に加熱延伸するに際し、ガラス棒の外径を測定する外径測定手段のレーザー光の発光部および受光部と、該発光部および受光部間に位置するガラス棒の加熱延伸部との間に、遮熱板をそれぞれ配置し、これらの遮熱板に形成された外径測定孔に開閉自在のシャッターを設け、該シャッターを適宜開放して延伸されたガラス棒の外径を測定し、延伸条件を制御することを特徴とするガラス棒の延伸方法。 A laser light emitting part and a light receiving part of an outer diameter measuring means for measuring the outer diameter of the glass rod when heating and stretching to a predetermined outer diameter while holding and rotating both ends of the glass rod, and the light emitting part and the light receiving part Heat shield plates are respectively arranged between the heating and extending portions of the glass rod located between them, and an openable / closable shutter is provided in the outer diameter measurement holes formed in these heat shield plates, and the shutters are appropriately opened. A method for stretching a glass rod, comprising measuring the outer diameter of the stretched glass rod and controlling the stretching conditions. ガラス棒をその両端部で保持し、該ガラス棒をこの軸の回りに回転させる機構に連結されたガラス棒把持手段、該ガラス棒の軸方向に沿って移動可能なガラス棒加熱手段、ガラス棒を軸方向に牽引する牽引手段及び牽引され延伸したガラス棒の外径を測定するレーザー光の発光部と受光部からなる外径測定手段を備え、ガラス棒加熱手段と外径測定手段の前記発光部および受光部との間に、ガラス棒の外径測定孔が形成された遮熱板をそれぞれ配置し、該外径測定孔に開閉自在のシャッターを設けてなるガラス棒の加熱延伸装置。Glass rod holding means connected to a mechanism for holding the glass rod at both ends thereof and rotating the glass rod around this axis, glass rod heating means movable along the axial direction of the glass rod, glass rod And an outer diameter measuring means comprising a light emitting portion and a light receiving portion for measuring the outer diameter of the pulled and drawn glass rod, and the light emission of the glass rod heating means and the outer diameter measuring means . between the parts and the light receiving portion, the heat shield plate having an outer diameter measurement hole is formed in the glass rod were arranged, heating drawing apparatus of a glass rod formed by providing a shutter opened and closed to the external diameter measurement hole.
JP22226399A 1999-08-05 1999-08-05 Method and apparatus for heating and stretching glass rod Expired - Fee Related JP3905256B2 (en)

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