JPH1111970A - Stretching device and stretching of glass rod - Google Patents
Stretching device and stretching of glass rodInfo
- Publication number
- JPH1111970A JPH1111970A JP9180677A JP18067797A JPH1111970A JP H1111970 A JPH1111970 A JP H1111970A JP 9180677 A JP9180677 A JP 9180677A JP 18067797 A JP18067797 A JP 18067797A JP H1111970 A JPH1111970 A JP H1111970A
- Authority
- JP
- Japan
- Prior art keywords
- glass rod
- outer diameter
- rod
- light
- stretching
- 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
- C03B37/01205—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
- C03B37/01257—Heating devices therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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、光ファイバ用母材など
のガラスロッドを延伸させるガラスロッドの延伸装置及
び延伸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 glass rod stretching apparatus and method for stretching a glass rod such as a preform for an optical fiber.
【０００２】[0002]
【従来の技術】従来、例えば光ファイバ用母材などのガ
ラスロッドを延伸するには、例えば図４に示すようなガ
ラスロッドの延伸装置を用いて行っている。つまり、こ
の装置では、延伸前のガラスロッドＬ1 （以下元ガラス
ロッドと略記する）を加熱炉１の炉芯部１ａに上方向か
ら（下方向からも可）挿入し、その上端はダミーロッド
２などを介して、ロッド送出し部３によって保持すると
共に適当な速度で送り出し、その太径部分の下方寄りは
上記加熱炉１の加熱部（ヒータ）４で加熱する一方、そ
の下端は、やはりダミーロッドなどを介して、ロッド引
取り部５によって引き取り、所定の外径に延伸させて延
伸済みのガラスロッドＬ2 （以下延伸ガラスロッドと略
記する）を得ている。なお、６は加熱部４の回りに充填
された断熱材である。2. Description of the Related Art Conventionally, for example, a glass rod such as a preform for an optical fiber is drawn by using a glass rod drawing apparatus as shown in FIG. In other words, in this apparatus, a glass rod L1 before stretching (hereinafter abbreviated as an original glass rod) is inserted into the furnace core 1a of the heating furnace 1 from above (or from below), and the upper end thereof is a dummy rod 2 And the like, while being held by the rod sending section 3 and sent out at an appropriate speed, and the lower portion of the large diameter portion is heated by the heating section (heater) 4 of the heating furnace 1 while the lower end thereof is also a dummy. The drawn glass rod L2 (hereinafter abbreviated as a drawn glass rod) is drawn by a rod pick-up portion 5 via a rod or the like, and drawn to a predetermined outer diameter. Reference numeral 6 denotes a heat insulating material filled around the heating unit 4.
【０００３】そして、この延伸ガラスロッドの外径制御
にあたっては、元ガラスロッドの下端（被加熱部）の断
面積と延伸ガラスロッドの目標延伸径での断面積の比率
に反比例させる形で、送出し速度と引取り速度の比率を
変化させて行っている。[0003] In controlling the outer diameter of the drawn glass rod, a feed is performed in inverse proportion to the ratio of the cross-sectional area of the lower end (heated portion) of the original glass rod to the cross-sectional area of the drawn glass rod at the target drawing diameter. It changes the ratio between the take-up speed and the take-up speed.
【０００４】[0004]
【発明が解決しようとする課題】ところが、実際には、
延伸ガラスロッドの外径は、元ガラスロッドの断面積と
延伸ガラスロッドとの断面積の比率だけで決まるもので
はないため、この両断面積の比率に基づいて、送出し速
度と引取り速度の比率を変化させるだけでは、必ずしも
延伸ガラスロッドの外径を、目標の延伸外径に正確に制
御することができないという問題があった。However, in practice,
Since the outer diameter of the drawn glass rod is not determined solely by the ratio of the cross-sectional area of the original glass rod to the cross-sectional area of the drawn glass rod, the ratio of the sending speed and the take-up speed is determined based on the ratio of these two cross-sectional areas. There is a problem that the outer diameter of the drawn glass rod cannot always be accurately controlled to the target drawn outer diameter only by changing the diameter of the drawn glass rod.
【０００５】特に、引き始めと引き終わりでは、断面積
比に基づいた送出し速度と引取り速度の比率だけで延伸
すると、延伸ガラスロッドの引き終わりが太くなってし
まうという問題が起きていた。そのため、実際には、引
き終わりでは、引取り速度を、送出し速度と引取り速度
の比率よりさらに速くすることで対処していた。しか
し、この方法にると、元ガラスロッドのサイズやその引
き終わり部の径の変化などの影響により、延伸ガラスロ
ッドの外径にばらつきが出るという問題があった。[0005] In particular, at the beginning and at the end of drawing, there is a problem that if the drawing is performed only by the ratio of the feeding speed and the take-up speed based on the cross-sectional area ratio, the drawn glass rod becomes thick at the end of drawing. Therefore, in practice, at the end of the take-up, the take-up speed has been dealt with by making the take-up speed higher than the ratio of the sending speed and the take-up speed. However, according to this method, there is a problem that the outer diameter of the drawn glass rod varies due to the influence of the size of the original glass rod and the diameter of the end portion of the drawn glass rod.
【０００６】この問題を解決するため、加熱炉の下にレ
ーザー外径測定器などを設けて、延伸ガラスロッドの外
径を、加熱炉の下で測定し、その測定結果を利用してフ
ィードバック制御を試みても、元ガラスロッドの外径と
延伸ガラスロッドの外径の比率が、１０以下という小さ
な値で、かつ、加熱部と外径測定位置が離れている（約
１０００ｍｍ程度）ため、ある元ガラスロッド位置にお
いて、延伸された延伸ガラスロッドの外径を測定してい
る間に、元ガラスロッドがさらに送り出されてしまって
いるので、むだ時間が大きく、外径測定結果をうまく制
御に利用できないという面があって、延伸ガラスロッド
径の外径公差を十分に小さくすることができないという
別の問題があった。In order to solve this problem, a laser outer diameter measuring device or the like is provided below the heating furnace, the outer diameter of the drawn glass rod is measured under the heating furnace, and feedback control is performed using the measurement result. Is attempted, the ratio of the outer diameter of the original glass rod to the outer diameter of the drawn glass rod is a small value of 10 or less, and the heating part and the outer diameter measurement position are separated (about 1000 mm). At the position of the original glass rod, while measuring the outer diameter of the drawn elongated glass rod, the original glass rod has been further fed out, so the dead time is large and the outer diameter measurement result is used well for control Another problem is that the outer diameter tolerance of the drawn glass rod diameter cannot be sufficiently reduced.
【０００７】このため、なるべく外径測定器などを加熱
炉の加熱部に近づけて設置する必要があるものの、加熱
炉自体の構造からすると、その下端から内部の加熱部の
下端まではある程度の距離（高さ）が必要とされるた
め、外径測定器などを加熱部に近づけるにしても自ずか
ら限界がある。かといって、外径測定器などを炉内に組
み込んで設置するには、外径測定器などの耐熱性から不
可能であった。For this reason, it is necessary to install an outer diameter measuring device or the like as close as possible to the heating part of the heating furnace. However, in view of the structure of the heating furnace itself, a certain distance is required from the lower end to the lower end of the internal heating part. Since (height) is required, there is naturally a limit even if an outer diameter measuring device or the like is brought closer to the heating unit. However, it was not possible to install the outer diameter measuring device and the like inside the furnace because of the heat resistance of the outer diameter measuring device and the like.
【０００８】これらの結果から、延伸ガラスロッドの外
径にばらつきが出易く、特に引き始めと引き終わりにお
いて、その傾向が強く、生産性を低下させたり、外径公
差の小さい高品質の延伸ガラスロッドが得られ難いとい
う不都合が生じていた。[0008] From these results, the outer diameter of the drawn glass rod is likely to vary, particularly at the beginning and end of the drawing, and this tendency is strong, which lowers the productivity and the high quality drawn glass having a small outside diameter tolerance. There was an inconvenience that it was difficult to obtain a rod.
【０００９】本発明は、このような観点に立ってなされ
たもので、加熱炉の加熱部の下方に光通路部を設け、こ
こに外径測定器を設置し、これによりガラスロッドの外
径を測定することによって、上記従来の問題点を解消す
る、優れたガラスロッドの延伸装置及び延伸方法を提供
せんとするものである。The present invention has been made in view of such a point. An optical path section is provided below a heating section of a heating furnace, and an outer diameter measuring device is installed therein. The present invention aims to provide an excellent glass rod stretching apparatus and an excellent stretching method that can solve the above-mentioned conventional problems by measuring the following.
【００１０】[0010]
【課題を解決するための手段】請求項１記載の本発明
は、加熱炉中にロッド送出し部によってガラスロッドを
送り出すと共にロッド引取り部によって引き出して延伸
させる装置において、前記加熱炉の加熱部の下方に延伸
されたガラスロッドの外径を測定する光通路部を設け、
この光通路部の炉外の一方に外径測定器の投光部を設置
すると共に、その炉外の他方に同じく外径測定器の受光
部を設置したことを特徴とするガラスロッドの延伸装置
にある。According to a first aspect of the present invention, there is provided an apparatus for feeding a glass rod into a heating furnace by a rod sending-out unit and drawing and extending the glass rod by a rod take-up unit. Provide an optical path for measuring the outer diameter of the glass rod extended below,
A glass rod stretching device, wherein a light emitting part of an outer diameter measuring device is installed on one side of the light path outside the furnace, and a light receiving part of the outer diameter measuring device is installed on the other side of the outside of the furnace. It is in.
【００１１】請求項２記載の本発明は、前記光通路部
を、加熱炉の加熱部下端から１００〜４００ｍｍの間に
設けたことを特徴とする請求項１記載のガラスロッドの
延伸装置にある。According to a second aspect of the present invention, there is provided the glass rod stretching apparatus according to the first aspect, wherein the optical path portion is provided between 100 and 400 mm from the lower end of the heating section of the heating furnace. .
【００１２】請求項３記載の本発明は、前記請求項１又
は２記載のガラスロッドの延伸装置において、延伸され
たガラスロッドに前記外径測定器の投光部からの測定光
を照射する一方、前記外径測定器の受光部で受光し、こ
の受光によるガラスロッドの外径データによって、前記
ロッド引取り部の引取り速度を制御することを特徴とす
るガラスロッドの延伸方法にある。According to a third aspect of the present invention, in the stretching apparatus for a glass rod according to the first or second aspect, the stretched glass rod is irradiated with measuring light from a light projecting unit of the outer diameter measuring device. And a light receiving unit of the outer diameter measuring device, wherein the receiving speed of the rod pulling unit is controlled based on data of the outer diameter of the glass rod based on the received light.
【００１３】[0013]
【発明の実施の形態】図１〜図２は、本発明に係るガラ
スロッドの延伸装置の１つの実施の形態を示したもので
ある。この装置も、基本的な構成部分は、上述した図４
のガラスロッドの延伸装置とほぼ同様であり、同一構成
部分には、図４の場合と同一の符号を付してあるが、加
熱炉１の加熱部４の下方に、延伸されたガラスロッドの
外径を測定する光通路部１０を設け、この光通路部１０
の炉外の一方に外径測定器２０のＬＤ、ＬＥＤ、発光ラ
ンプなどからなる投光部２１を設置すると共に、その炉
外の他方に外径測定器２０のＡＤＰ（アバランシェフォ
トダイオード）、ＰＩＮフォトダイオード、ホトトラン
ジスタ、光電子増倍管、ＳＣｄなどからなる受光部２２
を設置した点において異なる。1 and 2 show one embodiment of a glass rod stretching apparatus according to the present invention. This device also has the basic components shown in FIG.
The same components as those in FIG. 4 are denoted by the same reference numerals as those in FIG. 4, but below the heating unit 4 of the heating furnace 1, An optical path 10 for measuring the outer diameter is provided.
A light projecting unit 21 including an LD, an LED, a light-emitting lamp, and the like of the outer diameter measuring device 20 is installed on one side of the outside of the furnace, and an ADP (avalanche photodiode), PIN of the outer diameter measuring device 20 on the other side of the outside of the furnace. Light receiving section 22 composed of a photodiode, a phototransistor, a photomultiplier, SCd, etc.
Is different.
【００１４】上記光通路部１０は、加熱炉１の加熱部４
の下方で、炉の筐体部分の一方から中心を通り炉の筐体
部分の他方に貫通して設けられる。そのより具体的な位
置としては、元ガラスロッドＬ1 の外径にもよるが、加
熱部４の下端から１００〜４００ｍｍ程度の間がよい。
その理由は、元ガラスロッドＬ1 がその下端部寄りの加
熱によって延伸される際、その径は連続的に変化し、こ
の変化には最低でも１００ｍｍ程度の距離が必要とさ
れ、この１００ｍｍ程度未満の距離では、未だガラスが
溶けて径が変化している段階であるからであり、また、
逆に４００ｍｍ程度を越えるようになると、遅れ時間が
大きくなり過ぎて、上述したように、外径制御がうまく
行かないようになるからである。The light passage section 10 is connected to the heating section 4 of the heating furnace 1.
, From one of the furnace housing parts, through the center and through the other of the furnace housing parts. A more specific position is preferably about 100 to 400 mm from the lower end of the heating unit 4, although it depends on the outer diameter of the original glass rod L1.
The reason is that when the original glass rod L1 is stretched by heating near its lower end, its diameter changes continuously, and this change requires a distance of at least about 100 mm. Because at the distance, the glass is still melting and the diameter is changing,
Conversely, if it exceeds about 400 mm, the delay time becomes too large, and as described above, the outer diameter control cannot be performed well.
【００１５】この光通路部１０は、当然加熱炉１の炉芯
部１ａにも貫通して開口しているため、上記外径測定器
２０の投光部２１や受光部２２の設置される開口部１０
ａ，１０ｂ部分にも、高温の輻射熱などが照射されるこ
ととなるため、好ましくは炉の外壁部分に窓枠部材１
１，１１を取り付け、その窓穴１２，１２部分には、例
えばＣａＦ2 のような耐熱性で、投光部２１からの測定
光であるレーザ光などが通り易い材料の保護フィルタ１
３，１３を設けるとよい。この保護フィルタ１３，１３
は石英板でもよい。いずれにしても、これらの保護フィ
ルタ１３，１３によって、投光部２１や受光部２２が高
熱から良好に保護される。さらに、この保護フィルタ１
３，１３として、測定光のみを通して、輻射熱などはカ
ットする遮光フィルタを用いることも可能である。Since the light passage 10 is also open through the furnace core 1 a of the heating furnace 1, the light passage 21 and the light receiver 22 of the outer diameter measuring device 20 are installed in the light passage 10. Part 10
a and 10b are also irradiated with high-temperature radiant heat or the like.
The protective filter 1 is made of a heat-resistant material, such as CaF 2 , through which the laser light, which is the measuring light from the light projecting part 21, is easily passed.
3, 13 may be provided. The protection filters 13, 13
May be a quartz plate. In any case, the light projecting unit 21 and the light receiving unit 22 are well protected from high heat by the protection filters 13 and 13. Furthermore, this protection filter 1
As 3 and 13, it is also possible to use a light-shielding filter that cuts off radiant heat while passing only the measurement light.
【００１６】また、上記窓枠部材１１，１１の取り付け
に際しては、その炉の外壁部分への接合部１１ａは、例
えば図３に示すように、加熱炉１の炉芯部１ａからの高
温の輻射熱などに対して、死角となる部分に設けるよう
にするとよい。また、必要により、例えば外径測定器２
０の投光部２１の投光面側や受光部２２の受光面側に適
当な冷却媒体の循環される冷却部を設けて、これらの部
分の温度上昇を抑制するようにすることも可能である。When the window frame members 11, 11 are attached, the joint portion 11a to the outer wall of the furnace is, as shown in FIG. 3, for example, high-temperature radiant heat from the furnace core 1a of the heating furnace 1. For example, it may be provided in a blind spot. If necessary, for example, the outer diameter measuring device 2
It is also possible to provide a cooling unit in which a suitable cooling medium is circulated on the light emitting surface side of the light emitting unit 21 and the light receiving surface side of the light receiving unit 22 so as to suppress the temperature rise of these portions. is there.
【００１７】このような構成からなる本発明のガラスロ
ッドの延伸装置において、本発明のガラスロッドの延伸
方法を実施するには、次のようにすればよい。先ず、加
熱炉１中にロッド送出し部３によって元ガラスロッドＬ
1 を送り出すと共にロッド引取り部５よって引き取り、
このとき、外径測定器２０の投光部２１からの測定光を
延伸ガラスロッドＬ2 の所定の部分に照射する一方、外
径測定器２０の受光部２２で受光し、この受光によるガ
ラスロッドの外径データによって、ロッド引取り部５の
引取り速度を制御するため、所定の目標外径に高精度で
延伸させた延伸ガラスロッドＬ2 を得ることができる。In the apparatus for stretching a glass rod of the present invention having the above-described configuration, the method for stretching a glass rod of the present invention may be performed as follows. First, the original glass rod L is fed into the heating furnace 1 by the rod delivery unit 3.
1 and withdraw by the rod withdrawal part 5,
At this time, the measuring light from the light projecting portion 21 of the outer diameter measuring device 20 is irradiated on a predetermined portion of the stretched glass rod L2, while the light is received by the light receiving portion 22 of the outer diameter measuring device 20, and the glass rod is irradiated with the light. Since the take-up speed of the rod take-up section 5 is controlled based on the outer diameter data, it is possible to obtain a drawn glass rod L2 drawn to a predetermined target outer diameter with high accuracy.
【００１８】ここで、高精度での延伸が可能なのは、投
光部２１と受光部２２からなる外径測定装置２０が、最
も延伸ガラスロッドＬ2 の外径が安定的に維持される、
加熱部４の下端から１００〜４００ｍｍ程度の間の最適
位置に設置されているからである。Here, it is possible to perform the stretching with high accuracy because the outer diameter measuring device 20 including the light projecting portion 21 and the light receiving portion 22 can stably maintain the outer diameter of the stretched glass rod L2 most stably.
This is because it is installed at an optimum position between about 100 mm and 400 mm from the lower end of the heating unit 4.
【００１９】上記外径測定器２０の外径データによっ
て、ロッド引取り部５側にフィードバック制御を行うに
は、引取り速度のみ、もしくは引取り速度、ロッド送出
し部３側の送出し速度の両方を制御して行ってもよい。
この制御に用いる手法としては、特に限定されず、ＰＣ
での制御、ＰＩＤコントローラでの制御、ファジー制御
などが用いられる。According to the outer diameter data of the outer diameter measuring device 20, feedback control is performed on the rod pulling unit 5 side in order to determine only the pulling speed or the pulling speed or the feeding speed of the rod feeding unit 3 side. Both may be controlled and performed.
The method used for this control is not particularly limited.
Control, PID controller control, fuzzy control, and the like.
【００２０】なお、上記実施の形態では、ガラスロッド
が光ファイバ用母材の場合であったが、本発明は、これ
に限定されない。また、ガラスロッドも中実体に限ら
ず、中空体の場合にも適用することが可能である。In the above embodiment, the glass rod is a preform for an optical fiber, but the present invention is not limited to this. Further, the glass rod is not limited to a solid body, but can be applied to a hollow body.
【００２１】[0021]
【発明の効果】以上の説明から明らかなように、本発明
に係るガラスロッドの延伸装置及び延伸方法によると、
加熱炉の加熱部の下方に光通路部を設け、この部分に外
径測定器の投光部と受光部を設置し、これを利用して、
ガラスロッドの外径を測定するため、延伸ガラスロッド
の外径公差をより小さくすることができる。この結果、
延伸ガラスロッドの一部、特に引き始めや引き終わり部
分などを除去したりする必要もなく、大幅なガラスロッ
ドの歩留りの向上が期待できる。同時にまた、延伸ガラ
スロッドの全長にわたって、外径変動の小さい目標外径
に高精度で適合した高品質のガラスロッドを得ることが
できる。As is apparent from the above description, according to the glass rod stretching apparatus and the stretching method of the present invention,
An optical path section is provided below the heating section of the heating furnace, and a light emitting section and a light receiving section of an outer diameter measuring instrument are installed in this section, and by using this,
Since the outer diameter of the glass rod is measured, the outer diameter tolerance of the drawn glass rod can be further reduced. As a result,
There is no need to remove a part of the drawn glass rod, particularly, the part where the drawing starts and the part where the drawing ends, and a significant improvement in the yield of the glass rod can be expected. At the same time, it is possible to obtain a high-quality glass rod that is highly precisely adapted to a target outer diameter with a small outer diameter variation over the entire length of the drawn glass rod.
【図１】本発明に係るガラスロッドの延伸装置の１つの
実施の形態を示した概略縦断面図である。FIG. 1 is a schematic longitudinal sectional view showing one embodiment of a glass rod stretching apparatus according to the present invention.
【図２】図１のガラスロッドの延伸装置における光通路
部と外径測定器の投光部及び受光部を示した概略横断面
図である。FIG. 2 is a schematic cross-sectional view showing a light path portion and a light projecting portion and a light receiving portion of an outer diameter measuring device in the glass rod stretching device of FIG.
【図３】図１のガラスロッドの延伸装置における光通路
部の窓枠部材部分を示した部分拡大縦断面図である。3 is a partially enlarged longitudinal sectional view showing a window frame member portion of an optical path portion in the glass rod stretching device of FIG.
【図４】従来のガラスロッドの延伸装置を示した概略縦
断面図である。FIG. 4 is a schematic longitudinal sectional view showing a conventional glass rod stretching apparatus.
【符号の説明】 １ 加熱炉 ３ ロッド送出し部 ４ 加熱部 ５ ロッド引取り部 １０ 光通路部 １１ 窓枠部材 １２ 窓穴 １３ 保護フィルタ ２０ 外径測定器 ２１ 投光部 ２２ 受光部 Ｌ1 元ガラスロッド Ｌ2 延伸ガラスロッド[Description of Signs] 1 Heating furnace 3 Rod delivery section 4 Heating section 5 Rod take-up section 10 Optical path section 11 Window frame member 12 Window hole 13 Protective filter 20 Outside diameter measuring instrument 21 Light emitting section 22 Light receiving section L1 original glass Rod L2 drawn glass rod
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高橋 浩一 千葉県佐倉市六崎1440番地 株式会社フジ クラ佐倉工場内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichi Takahashi 1440 Mutsuzaki, Sakura City, Chiba Prefecture Inside Fujikura Sakura Plant
Claims (3)
スロッドを送り出すと共にロッド引取り部によって引き
出して延伸させる装置において、前記加熱炉の加熱部の
下方に延伸されたガラスロッドの外径を測定する光通路
部を設け、この光通路部の炉外の一方に外径測定器の投
光部を設置すると共に、その炉外の他方に外径測定器の
受光部を設置したことを特徴とするガラスロッドの延伸
装置。1. An apparatus for feeding a glass rod into a heating furnace by a rod sending-out unit and drawing and stretching the glass rod by a rod take-up unit to measure an outer diameter of the glass rod drawn below the heating unit of the heating furnace. A light path portion to be provided, a light emitting portion of an outer diameter measuring device is installed on one side of the light path portion outside the furnace, and a light receiving portion of the outer diameter measuring device is installed on the other side outside the furnace. Glass rod drawing equipment.
ら１００〜４００ｍｍの間に設けたことを特徴とする請
求項１記載のガラスロッドの延伸装置。2. The glass rod stretching apparatus according to claim 1, wherein the optical path portion is provided between 100 mm and 400 mm from the lower end of the heating section of the heating furnace.
の延伸装置において、延伸されたガラスロッドに前記外
径測定器の投光部からの測定光を照射する一方、前記外
径測定器の受光部で受光し、この受光によるガラスロッ
ドの外径データによって、前記ロッド引取り部の引取り
速度を制御することを特徴とするガラスロッドの延伸方
法。3. The stretching apparatus for a glass rod according to claim 1, wherein the stretched glass rod is irradiated with measurement light from a light projecting unit of the outer diameter measuring device, while the drawn glass rod is irradiated with a measuring light. A method for extending a glass rod, comprising: receiving light at a light receiving unit; and controlling a take-up speed of the rod taking-up unit based on data on an outer diameter of the glass rod based on the received light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9180677A JPH1111970A (en) | 1997-06-20 | 1997-06-20 | Stretching device and stretching of glass rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9180677A JPH1111970A (en) | 1997-06-20 | 1997-06-20 | Stretching device and stretching of glass rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1111970A true JPH1111970A (en) | 1999-01-19 |
Family
ID=16087383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9180677A Pending JPH1111970A (en) | 1997-06-20 | 1997-06-20 | Stretching device and stretching of glass rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1111970A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003014036A1 (en) * | 2001-08-11 | 2003-02-20 | Stanelco Fibre Optics Ltd | Furnace for stretching a glass rod |
| KR100611843B1 (en) | 2005-03-07 | 2006-08-11 | 엘에스전선 주식회사 | System and method for controlling tube diameter while manufacturing optical fiber preform using heating furnace |
| EP2428496A1 (en) | 2010-09-08 | 2012-03-14 | Shin-Etsu Chemical Co., Ltd. | Apparatus for fabricating a glass rod and method of same |
| EP2428495A1 (en) | 2010-09-08 | 2012-03-14 | Shin-Etsu Chemical Co., Ltd. | Apparatus for fabricating a glass rod and method of same |
-
1997
- 1997-06-20 JP JP9180677A patent/JPH1111970A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003014036A1 (en) * | 2001-08-11 | 2003-02-20 | Stanelco Fibre Optics Ltd | Furnace for stretching a glass rod |
| KR100611843B1 (en) | 2005-03-07 | 2006-08-11 | 엘에스전선 주식회사 | System and method for controlling tube diameter while manufacturing optical fiber preform using heating furnace |
| EP2428496A1 (en) | 2010-09-08 | 2012-03-14 | Shin-Etsu Chemical Co., Ltd. | Apparatus for fabricating a glass rod and method of same |
| EP2428495A1 (en) | 2010-09-08 | 2012-03-14 | Shin-Etsu Chemical Co., Ltd. | Apparatus for fabricating a glass rod and method of same |
| JP2012076990A (en) * | 2010-09-08 | 2012-04-19 | Shin-Etsu Chemical Co Ltd | Apparatus for fabricating glass rod and method for fabricating the same |
| JP2012076989A (en) * | 2010-09-08 | 2012-04-19 | Shin-Etsu Chemical Co Ltd | Apparatus for fabricating glass rod and method for fabricating the same |
| US8881552B2 (en) | 2010-09-08 | 2014-11-11 | Shin-Etsu Chemical Co., Ltd. | Apparatus for fabricating a glass rod and method of same |
| US8904825B2 (en) | 2010-09-08 | 2014-12-09 | Shin-Etsu Chemical Co., Ltd | Apparatus for fabricating a glass rod and method of same |
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