JPH0543255A - Glass base material manufacturing method - Google Patents
Glass base material manufacturing methodInfo
- Publication number
- JPH0543255A JPH0543255A JP19798891A JP19798891A JPH0543255A JP H0543255 A JPH0543255 A JP H0543255A JP 19798891 A JP19798891 A JP 19798891A JP 19798891 A JP19798891 A JP 19798891A JP H0543255 A JPH0543255 A JP H0543255A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- rod
- starting rod
- hole
- base material
- 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
- 239000011521 glass Substances 0.000 title claims abstract description 57
- 239000000463 material Substances 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000001308 synthesis method Methods 0.000 claims abstract description 6
- 239000010419 fine particle Substances 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 239000010453 quartz Substances 0.000 claims description 7
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 5
- 239000004917 carbon fiber Substances 0.000 claims description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 5
- 238000000151 deposition Methods 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 230000008021 deposition Effects 0.000 claims description 3
- 239000011203 carbon fibre reinforced carbon Substances 0.000 claims description 2
- 229910021397 glassy carbon Inorganic materials 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000002296 pyrolytic carbon Substances 0.000 claims description 2
- 239000000428 dust Substances 0.000 claims 1
- 230000002194 synthesizing effect Effects 0.000 abstract description 13
- 230000015572 biosynthetic process Effects 0.000 abstract description 7
- 239000002245 particle Substances 0.000 abstract description 7
- 238000003786 synthesis reaction Methods 0.000 abstract description 7
- 239000012808 vapor phase Substances 0.000 abstract description 7
- 239000007858 starting material Substances 0.000 abstract 1
- 239000002023 wood Substances 0.000 abstract 1
- 239000013307 optical fiber Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004017 vitrification Methods 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
- C03B37/012—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]
- C03B37/01486—Means for supporting, rotating or translating the preforms being formed, e.g. lathes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General 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)
- Glass Melting And Manufacturing (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
(57)【要約】
【目的】 気相合成法により出発材にガラス微粒子堆積
体を形成するガラス母材の製造方法を改良する。
【構成】 ＶＡＤ法、ＯＶＤ法等の気相合成により出発
ロッドの先端又は外周にガラス微粒子堆積体を合成する
にあたり、回転及びトラバース機構を有するチャックに
把持された支持棒の先端の嵌合部を中心軸を通り中心軸
に直行する貫通穴を有するパイプ状とし、同様の貫通穴
を有する出発ロッドを挿入して両者の貫通穴に耐熱性ピ
ンを貫通させて出発ロッド及び合成されるガラス母材の
重量を支持すると共に、該嵌合部に該貫通穴を挟んで中
心軸方向の２断面に嵌合部中心軸に向かってネジ穴を設
け、該ネジ穴から耐熱性ネジをネジ込んで出発ロッドを
固定して合成することにより、大型のガラス母材の重量
を支持し、且つ合成中の母材のガタツキやふれまわりを
防止できて、外径変動や偏心が低減された良好なガラス
母材を製造できる
(57) [Summary] [Objective] To improve a method for producing a glass preform for forming a glass particulate deposit on a starting material by a vapor phase synthesis method. [Structure] When synthesizing a glass particle deposit on the tip or outer periphery of a starting rod by vapor phase synthesis such as VAD method or OVD method, a fitting portion at the tip of a support rod gripped by a chuck having a rotation and traverse mechanism is provided. A glass base material to be formed into a pipe shape having a through hole passing through the central axis and having a through hole perpendicular to the central axis, inserting a starting rod having the same through hole, and inserting a heat resistant pin through both through holes to form a starting rod While supporting the weight of the fitting part, the fitting part is provided with a screw hole toward the fitting part center axis in two cross-sections in the central axis direction with the through hole sandwiched, and a heat resistant screw is screwed into the fitting hole to start. By fixing the rod and synthesizing it, it is possible to support the weight of a large glass base material, prevent rattling and whirling of the base material during synthesis, and reduce the outer diameter fluctuation and eccentricity. Can manufacture wood
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ＶＡＤ法（気相軸付
法）あるいはＯＶＤ法（外付法）などの気相合成法によ
りガラス微粒子堆積体を合成し、熱処理することにより
透明ガラス母材を得る方法に関し、特に光ファイバ用プ
リフォームなどの高品質ガラス母材の製造方法に適する
ものである。BACKGROUND OF THE INVENTION The present invention relates to a transparent glass matrix prepared by synthesizing a glass particle deposit by a vapor phase synthesis method such as VAD method (vapor phase axis method) or OVD method (external method) and heat treating it. The present invention relates to a method of obtaining a material, and is particularly suitable for a method of manufacturing a high quality glass preform such as an optical fiber preform.
【０００２】[0002]
【従来の技術】従来、高品質のガラス母材を合成する方
法として、図２に示すような方法がある。出発ロッド１
１を回転機構を有するチャック１２に把持された支持棒
１３にセットし、これを回転する。この出発ロッド１１
の先端に、ガラス微粒子合成用バーナ１４により生成さ
れたガラス微粒子を堆積させ、ガラス微粒子の堆積に合
わせてチャック１２をガラス微粒子合成用バーナ１４と
相対的にトラバースすることにより、ガラス微粒子堆積
体１５を軸方向に成長させる。所定の長さまで、引き上
げた後、バーナへのガラス原料ガス、燃焼ガスの供給を
ストップし、合成を終了する。2. Description of the Related Art Conventionally, as a method for synthesizing a high quality glass base material, there is a method as shown in FIG. Starting rod 1
1 is set on a support rod 13 held by a chuck 12 having a rotation mechanism, and this is rotated. This starting rod 11
Glass fine particles produced by the glass fine particle synthesizing burner 14 are deposited at the tip of the glass fine particle synthesizing burner 14, and the chuck 12 is traversed relative to the glass fine particle synthesizing burner 14 in accordance with the deposition of the glass fine particles, thereby depositing the glass fine particle deposits 15. Grow in the axial direction. After pulling up to a predetermined length, supply of glass raw material gas and combustion gas to the burner is stopped, and synthesis is completed.
【０００３】あるいは図３に示すように、回転する出発
ロッド１６の外周に、ガラス微粒子堆積体１５を合成す
る方法も用いられる。この方法では、出発ロッドとして
石英製のロッド、パイプ、屈折率が２重構造を有し、導
波構造を有する光ファイバ用中間プリフォームあるいは
耐熱性ダミーロッド等が用いられ、パイプ母材を製造す
る場合には、出発ロッド１６を引き抜き、中実のガラス
母材を得る場合には、そのまま高温熱処理することによ
り、透明ガラス母材を得る。Alternatively, as shown in FIG. 3, a method of synthesizing a glass fine particle deposit 15 on the outer circumference of a rotating starting rod 16 is also used. In this method, a quartz rod, a pipe, an optical fiber intermediate preform having a waveguide structure and a heat-resistant dummy rod, or the like is used as a starting rod to manufacture a pipe base material. In this case, the starting rod 16 is pulled out, and when a solid glass base material is obtained, the transparent glass base material is obtained by directly performing high temperature heat treatment.
【０００４】このような方法では、支持棒１２に出発ロ
ッド１１を把持する際、図４に示す如く、パイプ状の支
持棒嵌合部に出発ロッドを挿入し、支持棒嵌合部２０お
よび出発ロッド１１に中心軸を貫通するように開孔され
た貫通穴１７，１８を合わせ、耐熱性ピン１９を挿入す
ることにより、出発ロッド１１の重量を支持棒嵌合部２
０に支持させるのが一般的である。In such a method, when the starting rod 11 is gripped by the supporting rod 12, the starting rod is inserted into the pipe-shaped supporting rod fitting portion as shown in FIG. The weight of the starting rod 11 is reduced by aligning the through holes 17 and 18 formed in the rod 11 so as to penetrate the central axis and inserting the heat resistant pin 19.
Generally, it is supported by 0.
【０００５】[0005]
【発明が解決しようとする課題】従来、支持棒、出発ロ
ッドとしては、耐熱性材料、特に石英ガラスが用いられ
るのが一般的である。石英ガラスまたはセラミックスの
場合、加工精度は金属ほどを期待することができず、出
発ロッドと支持棒嵌合部との間には有る程度のクリアラ
ンスが生じるのは避けられない。特に石英製の出発ロッ
ドは、透明ガラス化時の高温炉内で熱変形する場合が多
く、あまりクリアランスを小さくすると出発ロッドの繰
り返し使用が難しくなるため、嵌合部のクリアランスに
は制限がある。Conventionally, heat-resistant materials, especially quartz glass, have been generally used as the support rods and the starting rods. In the case of quartz glass or ceramics, processing accuracy cannot be expected to be as high as that of metal, and a certain degree of clearance is inevitably generated between the starting rod and the support rod fitting portion. In particular, a starting rod made of quartz is often thermally deformed in a high-temperature furnace during transparent vitrification, and if the clearance is too small, it becomes difficult to repeatedly use the starting rod, and therefore the clearance of the fitting portion is limited.
【０００６】このクリアランスが大きくなると、出発ロ
ッドは支持棒を会して回転されたとき、ふれまわり、あ
るいはガタツキを生じてしまう。出発ロッドがガタツキ
を生じた場合、製造するガラス微粒子堆積体は中心軸が
固定されないため、外径変動を生じ、均一径のものを得
ることができない。また、ふれまわった場合には、出発
ロッドの外周にガラス微粒子堆積体を合成する際、出発
ロッドが母材中心から偏心した形となり、パイプおよび
光ファイバプリフォームとして使用する際、内孔および
コアの偏心となり問題となった。If this clearance becomes large, the starting rod will wobble or rattle when rotated while meeting the support rod. When the starting rod rattles, the manufactured glass fine particle deposit does not have a fixed central axis, so that the outer diameter fluctuates and it is not possible to obtain a uniform diameter. Also, if it touches, when synthesizing glass particulate deposits on the outer circumference of the starting rod, the starting rod becomes eccentric from the center of the preform, and when used as a pipe and optical fiber preform, the inner hole and core Became an eccentricity and became a problem.
【０００７】上記問題を防ぐ目的で特開平２−１１６６
４０号公報には、出発ロッドの頭部を出発ロッドより太
径とし、この頭部を嵌合する構造の支持方法において、
ネジ止めする方法が提示されている。ピンによる支持方
式についても同様の方法を試みたが、ネジの位置により
当初は固定さていても、ガラス微粒子堆積体合成時に再
びガタを生じたり、ふれまわりが大きくなったりする問
題が発生した。For the purpose of preventing the above problems, Japanese Patent Laid-Open No. 2-1166
No. 40 discloses a method of supporting a structure in which the head of the starting rod has a diameter larger than that of the starting rod and the head is fitted into the head.
A screwing method is presented. A similar method was tried for the support method using pins, but there was a problem that rattling occurred again or the whirling became large when the glass particle deposit was synthesized, even if initially fixed depending on the screw position.
【０００８】[0008]
【課題を解決するための手段】上記問題を解決するため
の本発明の手段は、回転およびトラバース機能を有する
チャックに把持された支持棒の先端の嵌合部に、出発ロ
ッドを嵌合し、該出発ロッドを回転させ、気相合成法に
より合成したガラス微粒子を上記出発ロッド先端あるい
は外周に堆積させ、ガラス微粒子の堆積に合わせて上記
支持棒および出発ロッドをトラバースさせることにより
ガラス微粒子堆積体を回転軸方向に合成し、その後該ガ
ラス微粒子堆積体を熱処理し、透明ガラス母材を製造す
る方法において、支持棒先端の嵌合部を中心軸を通り、
中心軸に直交する貫通穴を有するパイプ状とし、該パイ
プ内に嵌合部と同様の貫通穴を有する出発ロッドを挿入
し、両者の貫通穴に耐熱性のピンを貫通させることによ
り出発ロッド及び合成する母材の重量を支持し、且つ該
嵌合部に貫通穴をはさんで嵌合部中心軸方向の少なくと
も２断面に嵌合部中心軸に向かってネジ穴を設け、該ネ
ジ穴から耐熱性ネジをネジこむことにより上記出発ロッ
ドを固定することを特徴とするものである。上記ネジの
材質としては、石英、カーボン、カーボン繊維の成形
体、カーボン繊維との複合体あるいはＳｉＣ、熱分解カ
ーボン、ガラス状カーボンなどのコーティングを施した
カーボン等が特に好ましく、ネジ穴は１断面に２個設け
られ、貫通穴の両側にそれぞれ５０〜７０°の角度で設
けられていることが特に好ましい。Means for Solving the Problems The means of the present invention for solving the above problem is to fit a starting rod into a fitting portion at the tip of a support rod held by a chuck having a rotating and traversing function, The starting rod is rotated, glass fine particles synthesized by a vapor phase synthesis method are deposited on the tip or the outer periphery of the starting rod, and the supporting rod and the starting rod are traversed in accordance with the deposition of the glass fine particles to form a glass fine particle deposit. In the method of synthesizing in the direction of the rotation axis, then heat-treating the glass fine particle deposit, and manufacturing the transparent glass base material, the fitting portion at the tip of the support rod passes through the central axis
A pipe having a through hole perpendicular to the central axis is formed, a starting rod having a through hole similar to the fitting portion is inserted into the pipe, and a heat resistant pin is passed through both through holes to form a starting rod and The weight of the base material to be synthesized is supported, and a threaded hole is provided in at least two cross sections in the fitting part central axis direction across the fitting part through the through hole. It is characterized in that the starting rod is fixed by screwing in a heat resistant screw. As the material of the screw, quartz, carbon, a molded product of carbon fiber, a composite with carbon fiber or carbon coated with SiC, pyrolytic carbon, glassy carbon or the like is particularly preferable, and the screw hole has one cross section. It is particularly preferable that two of them are provided in each of the through holes and that they are provided on both sides of the through hole at an angle of 50 to 70 °.
【０００９】[0009]
【作用】本発明の構成を図１の（ａ），（ｂ）に示す。
支持棒１の先端には嵌合部２が設けられていて、出発ロ
ッド３が挿入されるようにパイプ状となっており、中心
軸を通り中心軸と直交する方向に貫通穴４が設けられて
いる。一方、出発ロッド３にも同様に貫通穴５が開孔さ
れており、出発ロッドを嵌合部に挿入後、これらの貫通
穴を合わせてピン６を挿入する。これにより出発ロッド
３の重量及びガラス微粒子堆積体（透明化する場合には
透明ガラス母材）等の合成される母材の重量が支持され
る。次に嵌合部２には貫通穴４を挟んで中心軸方向２断
面にそれぞれネジ穴７が、各断面に２個ずつ設けられて
いる。このネジ穴７は、それぞれの断面において、貫通
穴の両側に角度θが５０〜７０°になるように設けられ
ており、このネジ穴７を用いて図示のようにネジ８によ
り、出発ロッド３が固定される構成となっている。The structure of the present invention is shown in FIGS. 1 (a) and 1 (b).
A fitting portion 2 is provided at the tip of the support rod 1 and has a pipe shape so that the starting rod 3 can be inserted, and a through hole 4 is provided in a direction passing through the central axis and orthogonal to the central axis. ing. On the other hand, the starting rod 3 is similarly formed with a through hole 5, and after the starting rod is inserted into the fitting portion, these through holes are aligned and the pin 6 is inserted. This supports the weight of the starting rod 3 and the weight of the base material to be synthesized, such as the glass particulate deposit (transparent glass base material in the case of making transparent). Next, the fitting portion 2 is provided with two screw holes 7 in each of the two cross sections in the central axis direction with the through hole 4 interposed therebetween, two screw holes 7 in each cross section. The threaded holes 7 are provided on both sides of the through hole so that the angle θ is 50 to 70 ° in each cross section. Using the threaded holes 7 and the screws 8 as shown in the drawing, the starting rod 3 is formed. Is fixed.
【００１０】本発明に用いるネジの材質は、耐熱、耐食
性および石英の熱膨張率との関係から、石英、カーボン
あるいはカーボン繊維が主として用いられる。こうした
脆性材料の場合、強い力で締めすぎると破壊を起こすた
め、締めつけ力に限界がある。このため１本のネジで固
定した場合には、自ずと固定する力に限界が生じ、且つ
円柱状の出発ロッドを固定するため、固定面が点接触と
なり、何らかの振動、力が加わると、締め付け位置がず
れてしまい完全に固定することはできない。As the material of the screw used in the present invention, quartz, carbon or carbon fiber is mainly used in view of the relationship between heat resistance, corrosion resistance and the coefficient of thermal expansion of quartz. In the case of such a brittle material, there is a limit to the tightening force because it will break if it is tightened too much. For this reason, when fixing with one screw, there is a limit to the force of fixing itself, and because the cylindrical starting rod is fixed, the fixing surface becomes point contact, and if some vibration or force is applied, the tightening position It cannot be completely fixed because it is misaligned.
【００１１】そこで次のステップとして、１断面２本の
ネジで止めることを検討した。２本でも２本のネジの角
度が１８０°に開いていた場合には１本と殆ど同様に不
安定な状況となり、やはり途中でガタが生じてしまっ
た。また、あまり角度が小さすぎても１本の場合と同じ
となり２本の効果が得られないことが判明した。種々検
討の結果、ピンの角度が１００°〜１４０°（図１のθ
が５０〜７０°）の間が最良であることを見いだした。Therefore, as the next step, it was studied to fix the screw with two screws in one section. Even with two screws, when the angle of the two screws was 180 °, the situation was almost as unstable as with the first screw, and there was some play in the middle. It was also found that if the angle is too small, the effect is the same as the case of one and the effect of two is not obtained. As a result of various studies, the angle of the pin is 100 ° to 140 ° (θ in FIG. 1).
Of 50 to 70 °) was found to be the best.
【００１２】ところが、ピンによって出発ロッドの動き
に制限が加えられているため、１断面の２本のネジで締
めただけでは、ピンによって出発ロッドが引っかかる場
合があり、当初、固定されたと見えたものでも、ガラス
微粒子堆積体の合成中にゆるんでしまう場合が生じた。
特にガラス微粒子堆積体の重量が増加してくるとピンの
貫通部にかかるモーメントが大きくなり、ズレやすくな
ることがわかった。However, since the movement of the starting rod is restricted by the pin, the starting rod may be caught by the pin only by tightening the two screws of one section, and it was initially thought that the starting rod was fixed. In some cases, some of them loosened during the synthesis of the glass particulate deposit.
In particular, it has been found that when the weight of the glass particulate deposit increases, the moment applied to the penetrating portion of the pin increases, and the pin easily shifts.
【００１３】そこで、本発明ではピン貫通穴をはさんで
中心軸方向の２断面にネジを設け、且つ出発ロッドを嵌
合内壁にしっかり押しつける目的で、１断面のネジ位置
をピン貫通穴の両側に設ける構成とした。更にピンを設
ける角度として適切な角度を見いだした。この構成によ
れば、出発ロッドはピンの中心方向に押されるため、ピ
ンにひっかかることなく、嵌合内壁に固定され、且つピ
ンの上下の２断面で固定されるため、モーメントがかか
ってもピンが緩むことはない。本発明はパイプ状の嵌合
部に出発ロッドを挿入し、ピンにより重量を支持する支
持方式に極めて有効である。Therefore, in the present invention, a screw is provided in two cross sections in the central axis direction across the pin through hole, and the starting rod is firmly pressed against the inner wall of the fitting. It is configured to be installed in. Furthermore, I found an appropriate angle as the angle to install the pin. According to this structure, since the starting rod is pushed toward the center of the pin, the starting rod is fixed to the fitting inner wall without being caught by the pin, and is fixed at the two upper and lower cross sections of the pin, so that the pin is not affected by the moment. Never loosens. INDUSTRIAL APPLICABILITY The present invention is extremely effective for a supporting system in which a starting rod is inserted into a pipe-shaped fitting portion and a weight is supported by a pin.
【００１４】[0014]
【実施例】図１に示される構成の嵌合構造において、図
３に示す出発ロッド外周へのガラス微粒子堆積体の製造
を行った。支持棒１および出発ロッドは石英製ロッドと
し、出発ロッドは中心部に周辺部より屈折率の高いコア
を有し、クラッド／コア外径比が５倍の光ファイバ用中
間プリフォームを得た。嵌合部はセラミック製のピンで
重量支持を行い、カーボン製ネジで固定した。カーボン
製ネジは、ピン用の貫通穴の下方２０ｍｍおよび上方１
０ｍｍの２断面に設け、それぞれの断面内にピンの貫通
穴方向に対して、左右に６０°ずつズレた位置（ネジ相
互の交差角は１２０°）のものを用いた。この結果、出
発ロッドをセット後の、出発ロッドのガタツキおよびふ
れまわりは殆どなくなり、出発ロッド側面のふれは０．
１ｍｍ以内に抑えることができた。この状態でガラス微
粒子堆積体を出発ロッド外周に長さ６００ｍｍにわたっ
て合成した。外径は１２４ｍｍで全長にわたり外径変動
１ｍｍ以内の安定したものが得られた。最終的な全重量
は２．５ｋｇであったが、ガラス微粒子堆積体合成中ふ
れまわりが大きくなることはなかった。この出発ロッド
とガラス微粒子堆積体の複合体を、１６００℃の高温炉
で透明ガラス化した。この結果、φ５６ｍｍの透明なガ
ラス体を得た。このガラス体を線引し、１２５μｍの外
径を有する光ファイバ得た。その特性を調べたところ、
コア偏心は０．１μｍ以下の非常に良好なものであっ
た。EXAMPLE In the fitting structure having the structure shown in FIG. 1, glass particle deposits were manufactured on the outer circumference of the starting rod shown in FIG. The support rod 1 and the starting rod were made of quartz, and the starting rod had a core having a higher refractive index in the central portion than in the peripheral portion, and an intermediate preform for an optical fiber having a clad / core outer diameter ratio of 5 times was obtained. The fitting part was supported by weight with ceramic pins and fixed with carbon screws. Carbon screws are 20 mm below and 1 above the through hole for the pin.
It was provided in two cross sections of 0 mm, and the positions were shifted by 60 ° to the left and right with respect to the direction of the through hole of the pin in each cross section (the cross angle between the screws was 120 °). As a result, after the starting rod is set, rattling and whirling of the starting rod are almost eliminated, and runout on the side surface of the starting rod is 0.
It could be suppressed within 1 mm. In this state, the glass particle deposit was synthesized on the outer circumference of the starting rod over a length of 600 mm. The outer diameter was 124 mm, and a stable one having an outer diameter variation of 1 mm or less was obtained over the entire length. The final total weight was 2.5 kg, but whirling did not increase during the synthesis of the glass particulate deposit. The composite of the starting rod and the glass particulate deposit was made into vitrified glass in a high temperature furnace at 1600 ° C. As a result, a transparent glass body having a diameter of 56 mm was obtained. This glass body was drawn to obtain an optical fiber having an outer diameter of 125 μm. When I investigated its characteristics,
The core eccentricity was 0.1 μm or less, which was very good.
【００１５】[0015]
【発明の効果】以上説明したように、本発明によれば、
出発ロッドの固定支持がガラス微粒子堆積体合成中にわ
たり維持されるので、出発ロッドのガタツキ、ふれまわ
りによりガラス微粒子堆積体の外径変動および偏心を抑
えることができ、良好なガラス母材を得ることができ
る。特にコアの偏心特性の良好な光ファイバ用プリフォ
ームの製造方法に適している。また、本発明は光ファイ
バ用プリフォームだけでなく、出発ロッドの外周にガラ
ス微粒子堆積体を合成し、その後出発ロッドを引き抜
き、透明ガラス化し、ガラスパイプを製造する方法で
も、外周、内周の同軸度の良好なパイプを製造すること
が可能である。As described above, according to the present invention,
Since the fixed support of the starting rod is maintained throughout the synthesis of the glass particulate deposit, it is possible to suppress fluctuations in the outer diameter and eccentricity of the glass particulate deposit due to rattling and whirling of the starting rod, and to obtain a good glass base material. You can In particular, it is suitable for a method for manufacturing an optical fiber preform having a good core eccentricity characteristic. Further, the present invention is not limited to the optical fiber preform, but also a method of synthesizing a glass fine particle deposit on the outer circumference of the starting rod, then pulling out the starting rod, making it transparent glass, and manufacturing a glass pipe, the outer and inner circumferences It is possible to manufacture a pipe with good coaxiality.
【図１】本発明の構成中、嵌合部を示す図である。FIG. 1 is a view showing a fitting portion in the configuration of the present invention.
【図２】気相合成法により出発ロッド先端にガラス微粒
子堆積体を合成する場合の基本的構成を示す概略図であ
る。FIG. 2 is a schematic diagram showing a basic configuration in the case of synthesizing a glass particulate deposit on the tip of a starting rod by a vapor phase synthesis method.
【図３】気相合成法により出発ロッド外周にガラス微粒
子堆積体を合成する場合の基本的構成を示す概略図であ
る。FIG. 3 is a schematic diagram showing a basic configuration in the case of synthesizing a glass particulate deposit on the outer circumference of a starting rod by a vapor phase synthesis method.
【図４】 支持棒嵌合への出発ロッド取付けの従来法に
よる構成を示す概略説明図である。FIG. 4 is a schematic explanatory diagram showing a configuration of a conventional method for attaching a starting rod to a support rod fitting.
【符号の説明】 １ 支持棒 ２ 嵌合部 ３ 出発ロッド ４ ピン用の貫通穴 ５ ピン用の貫通穴 ６ ピン ７ ネジ穴 ８ ネジ 11 出発ロッド 12 チャック 13 支持棒 14 ガラス微粒子合成用バーナ 15 ガラス微粒子堆積体 16 出発ロッド 17 ピン用の貫通穴 18 ピン用の貫通穴 19 ピン 20 嵌合部[Explanation of symbols] 1 Support rod 2 Fitting part 3 Starting rod 4 Through hole for 4 pin 5 Through hole for 5 pin 6 Pin 7 Screw hole 8 Screw 11 Starting rod 12 Chuck 13 Support rod 14 Burner for glass particle synthesis 15 Glass Particle deposit 16 Starting rod 17 Through hole for pin 18 Through hole for pin 19 Pin 20 Mating part
───────────────────────────────────────────────────── フロントページの続き (72)発明者 齋藤 眞秀 神奈川県横浜市栄区田谷町１番地 住友電 気工業株式会社横浜製作所内 (72)発明者 伊藤 真澄 神奈川県横浜市栄区田谷町１番地 住友電 気工業株式会社横浜製作所内 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Masahide Saito 1 Taya-cho, Sakae-ku, Yokohama, Kanagawa Sumitomo Electric Industries, Ltd. Yokohama Works (72) Masumi Ito 1 Taya-cho, Sakae-ku, Yokohama, Kanagawa Sumitomo Electric Industry Co., Ltd. Yokohama Works
Claims (3)
ックに把持された支持棒の先端の嵌合部に、出発ロッド
を嵌合し、該出発ロッドを回転させ、気相合成法により
合成したガラス微粒子を上記出発ロッド先端あるいは外
周に堆積させ、ガラス微粒子の堆積に合わせて上記支持
棒および出発ロッドをトラバースさせることによりガラ
ス微粒子堆積体を回転軸方向に合成し、その後該ガラス
微粒子堆積体を熱処理し、透明ガラス母材を製造する方
法において、支持棒先端の嵌合部を中心軸を通り、中心
軸に直交する貫通穴を有するパイプ状とし、該パイプ内
に嵌合部と同様の貫通穴を有する出発ロッドを挿入し、
両者の貫通穴に耐熱性のピンを貫通させることにより出
発ロッド及び合成する母材の重量を支持し、且つ該嵌合
部に貫通穴をはさんで嵌合部中心軸方向の少なくとも２
断面に嵌合部中心軸に向かってネジ穴を設け、該ネジ穴
から耐熱性ネジをネジこむことにより上記出発ロッドを
固定することを特徴とするガラス母材の製造方法。1. A glass fine particle synthesized by a gas phase synthesis method by fitting a starting rod into a fitting portion of a tip of a support rod gripped by a chuck having a rotating and traversing function and rotating the starting rod. The starting rod is deposited on the tip or the outer periphery, and the glass rod deposit is synthesized in the rotation axis direction by traversing the supporting rod and the starting rod in accordance with the deposition of the glass dust, and then the glass particulate deposit is heat-treated, In the method for producing a transparent glass preform, the fitting portion at the tip of the supporting rod is formed into a pipe shape having a through hole passing through the central axis and orthogonal to the central axis, and having the same through hole as the fitting portion in the pipe. Insert the starting rod,
The weight of the starting rod and the base material to be synthesized is supported by penetrating the heat resistant pins through the through holes of both, and at least 2 in the direction of the central axis of the fitting part is sandwiched between the fitting part and the through hole.
A method for manufacturing a glass preform, comprising forming a screw hole in a cross section toward a central axis of a fitting portion, and fixing the starting rod by screwing a heat resistant screw into the screw hole.
ボン、カーボン繊維の成形体、カーボン繊維との複合体
あるいはＳｉＣ、熱分解カーボン、ガラス状カーボンな
どのコーティングを施したカーボンであることを特徴と
する請求項１記載のガラス母材の製造方法。2. The screw for fixing the starting rod is made of quartz, carbon, a molded body of carbon fiber, a composite with carbon fiber, or carbon coated with SiC, pyrolytic carbon, glassy carbon, or the like. The method for producing a glass base material according to claim 1.
通穴の両側にそれぞれ５０〜７０°の角度で設けること
を特徴とする請求項１または２記載のガラス母材の製造
方法。3. The method for producing a glass base material according to claim 1, wherein two screw holes are provided for each cross section, and the screw holes are provided on both sides of the through hole at an angle of 50 to 70 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19798891A JPH0543255A (en) | 1991-08-07 | 1991-08-07 | Glass base material manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19798891A JPH0543255A (en) | 1991-08-07 | 1991-08-07 | Glass base material manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0543255A true JPH0543255A (en) | 1993-02-23 |
Family
ID=16383645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19798891A Pending JPH0543255A (en) | 1991-08-07 | 1991-08-07 | Glass base material manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0543255A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002284538A (en) * | 2001-03-23 | 2002-10-03 | Sumitomo Electric Ind Ltd | Support method and support pins for glass base material |
| KR20030077881A (en) * | 2002-03-27 | 2003-10-04 | 엘지전선 주식회사 | A combination device of coupler for sintering |
| JP2006193369A (en) * | 2005-01-13 | 2006-07-27 | Shin Etsu Chem Co Ltd | Quartz glass rod processing method and apparatus, and carbon jig used therefor |
| EP2716612A1 (en) * | 2012-10-05 | 2014-04-09 | Shin-Etsu Chemical Co., Ltd. | Mechanism and method for hanging a glass optical fibre preform |
-
1991
- 1991-08-07 JP JP19798891A patent/JPH0543255A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002284538A (en) * | 2001-03-23 | 2002-10-03 | Sumitomo Electric Ind Ltd | Support method and support pins for glass base material |
| WO2002076896A1 (en) * | 2001-03-23 | 2002-10-03 | Sumitomo Electric Industries, Ltd. | Method of supporting glass base material and supporting pin |
| KR20030077881A (en) * | 2002-03-27 | 2003-10-04 | 엘지전선 주식회사 | A combination device of coupler for sintering |
| JP2006193369A (en) * | 2005-01-13 | 2006-07-27 | Shin Etsu Chem Co Ltd | Quartz glass rod processing method and apparatus, and carbon jig used therefor |
| EP2716612A1 (en) * | 2012-10-05 | 2014-04-09 | Shin-Etsu Chemical Co., Ltd. | Mechanism and method for hanging a glass optical fibre preform |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0578244B1 (en) | Method for drawing glass preform for optical fiber | |
| US5417399A (en) | Apparatus for supporting article in heating furnace | |
| JP2584619B2 (en) | Manufacturing method of non-axisymmetric optical fiber preform | |
| US7198247B2 (en) | Mandrel for producing quartz glass and production method for optical fiber mother material, optical fiber and quartz glass body using the same | |
| JPH0543255A (en) | Glass base material manufacturing method | |
| JPH0624784A (en) | Production of optical fiber | |
| JP6615036B2 (en) | Optical fiber preform manufacturing method and optical fiber manufacturing method | |
| JP2005263577A (en) | Equipment for manufacturing glass preforms for optical fibers | |
| EP0519468B1 (en) | Apparatus for supporting article in heating furnace | |
| AU668815B2 (en) | Apparatus for supporting a glass article to be heat treated | |
| JP2549716B2 (en) | Supporting structure for starting material for forming glass base material | |
| JPH05193957A (en) | Device for supporting glass article | |
| JP2000086268A (en) | Optical fiber preform manufacturing equipment | |
| JP4674886B2 (en) | Support for optical fiber manufacturing | |
| JP4037799B2 (en) | Optical fiber preform and manufacturing method thereof | |
| JP5697049B2 (en) | Device for gripping support rod for optical fiber preform and method for producing optical fiber preform | |
| JP4177024B2 (en) | Manufacturing method of optical fiber preform | |
| JPH07242435A (en) | Production of porous glass base material for optical fiber | |
| JP4495992B2 (en) | Manufacturing method of glass preform for optical fiber | |
| JPH09278477A (en) | Method for producing glass preform for optical fiber | |
| JP2986453B1 (en) | Apparatus and method for manufacturing glass preform for optical fiber | |
| JP3064276B1 (en) | Apparatus for producing porous preform for optical fiber and glass rod for optical fiber | |
| JP3588642B2 (en) | Manufacturing method of optical fiber preform | |
| JP3141545B2 (en) | Drawing method of preform for optical fiber | |
| JPS60264336A (en) | Manufacture of optical glass preform |