JPS5836940A - Manufacture of preform rod for optical fiber - Google Patents
Manufacture of preform rod for optical fiberInfo
- Publication number
- JPS5836940A JPS5836940A JP13241881A JP13241881A JPS5836940A JP S5836940 A JPS5836940 A JP S5836940A JP 13241881 A JP13241881 A JP 13241881A JP 13241881 A JP13241881 A JP 13241881A JP S5836940 A JPS5836940 A JP S5836940A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- quartz
- rod
- diameter
- quartz tube
- 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
- 239000013307 optical fiber Substances 0.000 title claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000010453 quartz Substances 0.000 claims abstract description 53
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000011521 glass Substances 0.000 abstract description 4
- 238000004381 surface treatment Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 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
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
-
- 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
- C03B37/01248—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing by collapsing without drawing
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
【発明の詳細な説明】
に係り、特にロノドインチューブ法におけるコアの偏心
を防いだ製造法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates, in particular, to a manufacturing method that prevents core eccentricity in the rono-do-in-tube method.
ロノドインチューブ法は、一般に第１図及び第２図に示
す工程を経てプリ７オームが形成される。In the rono-do-in-tube method, a pre-7 ohm is generally formed through the steps shown in FIGS. 1 and 2.
すなわち、両端開口の石英管１をガラス旋盤のチャック
２．２によ）支持し―このチャック２。That is, a quartz tube 1 with open ends is supported by a chuck 2.2 of a glass lathe.
２に略対応する位置の石英管，１め内部１にテフロン等
の材料で形成した支持リング３．３を嵌め込む。A support ring 3.3 made of a material such as Teflon is fitted into the inside of the quartz tube 1 at a position approximately corresponding to 2.
そして、この支持りＸグ３，３間に・コアとなる石英棒
４を挿通する。Then, a quartz rod 4 serving as a core is inserted between the supports 3 and 3.
その後、所定距離間を往復動する酸水素バーナ５の火炎
を石英管１の外面に当てると共にガラス旋盤により石英
管１を一定速度で回転させ、一端から他端へと縮径して
行く。Thereafter, the flame of the oxyhydrogen burner 5, which reciprocates over a predetermined distance, is applied to the outer surface of the quartz tube 1, and the quartz tube 1 is rotated at a constant speed by a glass lathe to reduce the diameter from one end to the other end.
しかるに、かかる縮径を行う過程において、完成したプ
リ７オームロツドの屈折率分布を均一化させるために、
一般に一挙に石英管１をつぶすことなく、酸水素バーナ
５を数回往復動させ、表面処理、すなわち、界面の均一
化を計っている。However, in the process of reducing the diameter, in order to make the refractive index distribution of the completed pre-7 ohm rod uniform,
Generally, the oxyhydrogen burner 5 is moved back and forth several times without crushing the quartz tube 1 all at once, in order to treat the surface, that is, to make the interface uniform.
この工程で第２図に示すように、石英管１の内部の石英
棒４が加熱によシ軟化し、支持リング３。In this step, as shown in FIG. 2, the quartz rod 4 inside the quartz tube 1 is heated and softened, forming the support ring 3.
３で石英管ｌの中心に正確に支持したにもかかわらず、
石英棒４が曲ってしまう場合があり、この場合には、均
一な屈折率分布を有するプリフォームロノドが形成され
ない欠点がある。Although it was supported accurately at the center of the quartz tube l in step 3,
The quartz rod 4 may be bent, and in this case, there is a drawback that a preform rod having a uniform refractive index distribution cannot be formed.
本発明は、かかる点にかんがみてなされたもので、石英
棒を石英管内に周定する以前に石英管の両端所定位置を
石英棒の外径よりもわずかに大きな内径になるまで縮径
しておき、次いで石英棒を挿入し、支持リングで固定す
ることによりコアの偏心を防いだ光ファイバ用プリフォ
ームロンドの製造法を提供することを目的とする。The present invention has been made in view of the above-mentioned problems, and, before the quartz rod is circumferentially placed inside the quartz tube, the diameter of both ends of the quartz tube is reduced to an inner diameter slightly larger than the outer diameter of the quartz tube. The object of the present invention is to provide a method for manufacturing an optical fiber preform rond in which eccentricity of the core is prevented by inserting a quartz rod into the quartz rod and fixing it with a support ring.
以下に、本発明の一実施例を図面を参照して説明する。An embodiment of the present invention will be described below with reference to the drawings.
先ず、第３図に示すようにガラス旋盤のチャック２，２
に石英管１を装着し、次いで酸水素バーナ５で石英管１
の複数箇所を後に挿入される石英棒の外径よりもやや大
きめの内径になるまで縮径させ、縮径部６を形成する。First, as shown in Fig. 3, the chucks 2, 2 of the glass lathe are
The quartz tube 1 is attached to the quartz tube 1, and then the quartz tube 1 is
The diameter of the quartz rod is reduced at a plurality of locations until the inner diameter becomes slightly larger than the outer diameter of the quartz rod to be inserted later, thereby forming the reduced diameter portion 6.
上記の縮径部６は、チャック２．２間の位置で、かつ出
来るだけ等間隔である方が荷重を等分に負担する点で好
ましい。It is preferable that the reduced diameter portions 6 are located between the chucks 2 and 2 and are spaced as evenly as possible from the viewpoint of equally distributing the load.
なお、石英管１の縮径部６の寸法測定は、レーザ外測計
等で非接触状態で行なう。Note that the dimensions of the reduced diameter portion 6 of the quartz tube 1 are measured in a non-contact manner using a laser external measuring device or the like.
次に、第２図に示すように、支持リング３．３を石英管
１のチャック２，２での挾持位置に挿入した後、石英棒
４を支持リング３．３に挿入する。Next, as shown in FIG. 2, the support ring 3.3 is inserted into the position where the quartz tube 1 is clamped by the chucks 2, 2, and then the quartz rod 4 is inserted into the support ring 3.3.
以下、従来工程と同様に酸水素バーナ５により、石英管
１の外面に沿って軸方向に往復動させ、石英管１の内面
及び−石英−管４の外面の表面処理を施す。Thereafter, as in the conventional process, the oxyhydrogen burner 5 is moved back and forth in the axial direction along the outer surface of the quartz tube 1 to perform surface treatment on the inner surface of the quartz tube 1 and the outer surface of the quartz tube 4.
この場合、石英管１内の石英＄１は、支持リング３．３
の他に複数箇所の縮径部６．６で支持されるため、加熱
によって石英棒４が軟化しても石英棒４の曲りが抑制さ
れる。In this case, the quartz $1 in the quartz tube 1 is attached to the support ring 3.3
In addition, since the quartz rod 4 is supported by a plurality of reduced diameter portions 6.6, bending of the quartz rod 4 is suppressed even if the quartz rod 4 is softened by heating.
なお、表面処理が終了した後は、石英管１の一端から他
端へ一挙に縮径して行き、プリフォームロッドを完成さ
せる。Note that after the surface treatment is completed, the diameter of the quartz tube 1 is reduced from one end to the other end all at once to complete the preform rod.
第５図は、本発明の他の実施例を示すもので、石英管内
面及び石英棒外面の表面処理を行なわない場合、すなわ
ち、界面の平滑性を厳密に要求されない場合には、部分
的な縮径部ではなくチーヤシ２２．２間の一定範囲に亘
る筒状縮径部７を形成する。FIG. 5 shows another embodiment of the present invention, in which a partial Rather than a reduced diameter portion, a cylindrical reduced diameter portion 7 extending over a certain range between the teacups 22.2 is formed.
上記の場合には、石英棒４の支持面積が多くなり、一端
から他端へ向って縮径して行く際に石英棒４の曲がりが
少くなるため、よりコアの偏心が防げるという効果があ
る。In the above case, the supporting area of the quartz rod 4 increases, and the bending of the quartz rod 4 decreases when the diameter decreases from one end to the other, which has the effect of further preventing eccentricity of the core. .
上記の説明から明らかなように本発明によれば、石英管
内の中心に挿入する石英棒を両端の支持リングで固定し
、さらにこの支持リング間の複数箇所に設けた縮径部で
保持するようにしたので、酸水素バーナによる加熱時の
石英棒の曲りが防げ、従ってコアの偏心が抑制され、屈
折率分布の均一な光フアイバ用プリフォームロッドを形
成することができる。As is clear from the above description, according to the present invention, the quartz rod inserted into the center of the quartz tube is fixed by support rings at both ends, and further held by reduced diameter portions provided at multiple locations between the support rings. Therefore, bending of the quartz rod during heating with an oxyhydrogen burner can be prevented, and eccentricity of the core can be suppressed, making it possible to form an optical fiber preform rod with a uniform refractive index distribution.
第１図及び第２図は、従来の光フアイバ用プリ７オーム
ロツドの製造法の工程を示す断面図、第３図及び第４図
は、本発明の一実施例を示す光７アイパ用プリ７オーム
ロツドの製造法の工程を示す断面図、第５図は、本発明
の他の実施例を示す断面図である。
１・・・石英管、 ２°°゛チヤツク１３・・・
支持リング、 ４・・・石英棒、５・・・酸水素バ
ーナ、 ６・・・縮径部。1 and 2 are cross-sectional views showing the manufacturing process of a conventional pre-7 ohm rod for an optical fiber, and FIGS. 3 and 4 are cross-sectional views showing a pre-7 ohm rod for an optical fiber according to an embodiment of the present invention. FIG. 5 is a cross-sectional view showing the steps of the Ohmrod manufacturing method. FIG. 5 is a cross-sectional view showing another embodiment of the present invention. 1...Quartz tube, 2°°chuck 13...
Support ring, 4... Quartz rod, 5... Oxygen hydrogen burner, 6... Diameter reduction part.
Claims (1)
石英棒を固定し、前記石英管の一端ｌから他端までを酸
水素バーナにて縮径していくものにおいて、前記支持リ
ング間の石英管にあらかじめ石英棒の外径よりわずかに
大きな内径を有する縮径部を形成し、石英棒の中間支持
部としたことを特徴とする光フアイバ用プリフォームロ
ッドの製造法。A support ring is inserted into both ends of a quartz tube, a quartz rod is fixed to the support ring, and the diameter of the quartz tube is reduced from one end l to the other end using an oxyhydrogen burner. A method for producing a preform rod for an optical fiber, characterized in that a reduced diameter part having an inner diameter slightly larger than the outer diameter of the quartz rod is formed in advance in a quartz tube, and the reduced diameter part is used as an intermediate support part of the quartz rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13241881A JPS5836940A (en) | 1981-08-24 | 1981-08-24 | Manufacture of preform rod for optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13241881A JPS5836940A (en) | 1981-08-24 | 1981-08-24 | Manufacture of preform rod for optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5836940A true JPS5836940A (en) | 1983-03-04 |
Family
ID=15080904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13241881A Pending JPS5836940A (en) | 1981-08-24 | 1981-08-24 | Manufacture of preform rod for optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5836940A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1346958A1 (en) * | 2000-12-08 | 2003-09-24 | Sumitomo Electric Industries, Ltd. | Optical fiber preform producing method, optical fiber preform, and optical fiber |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54116426A (en) * | 1978-02-23 | 1979-09-10 | Hitachi Cable Ltd | Production of optical fiber |
-
1981
- 1981-08-24 JP JP13241881A patent/JPS5836940A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54116426A (en) * | 1978-02-23 | 1979-09-10 | Hitachi Cable Ltd | Production of optical fiber |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1346958A1 (en) * | 2000-12-08 | 2003-09-24 | Sumitomo Electric Industries, Ltd. | Optical fiber preform producing method, optical fiber preform, and optical fiber |
| EP1346958A4 (en) * | 2000-12-08 | 2004-11-24 | Sumitomo Electric Industries | Optical fiber preform producing method, optical fiber preform, and optical fiber |
| US6987917B2 (en) | 2000-12-08 | 2006-01-17 | Sumitomo Electric Industries, Ltd. | Optical fiber preform producing method, optical fiber preform, and optical fiber |
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