JPS6259547A - Production of optical fiber preform - Google Patents
Production of optical fiber preformInfo
- Publication number
- JPS6259547A JPS6259547A JP19947685A JP19947685A JPS6259547A JP S6259547 A JPS6259547 A JP S6259547A JP 19947685 A JP19947685 A JP 19947685A JP 19947685 A JP19947685 A JP 19947685A JP S6259547 A JPS6259547 A JP S6259547A
- Authority
- JP
- Japan
- Prior art keywords
- core rod
- quartz tube
- clad quartz
- clad
- 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
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
- C03B37/0124—Means for reducing the diameter of rods or tubes by drawing, e.g. for preform draw-down
- C03B37/01245—Means for reducing the diameter of rods or tubes by drawing, e.g. for preform draw-down by drawing and collapsing
-
- 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
- C03B37/0126—Means for supporting, rotating, translating the rod, tube or preform
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、カプラスによりプリフォームを製造する際の
コアロッドの鍋心を最小限に押えることができる光ファ
イバのプリフォーム製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an optical fiber preform manufacturing method that can minimize the center of the core rod when manufacturing the preform using a coupler.
［従来の技術］
従来のカプラスによるプリフォームの製造方法は、第２
図に示すように、まず、コアロッド１をクラッド石英管
２内に挿入し、コアロッド１の先端をクラッド石英管２
の底部に当接させてコアロッド１とクラッド石英管２と
の軸芯合せをした後、クラツド石英管２括部のダミー管
３をバーナにより加熱してダミー管３とコアロッド１基
部のダミーロッド４とを一体化する。[Prior art] The conventional method for manufacturing a preform using a coupler is the second method.
As shown in the figure, first, the core rod 1 is inserted into the clad quartz tube 2, and the tip of the core rod 1 is inserted into the clad quartz tube 2.
After aligning the axes of the core rod 1 and the clad quartz tube 2 by bringing them into contact with the bottom of the clad quartz tube, the dummy tube 3 at the second joint of the clad quartz tube is heated with a burner, and the dummy tube 3 and the dummy rod 4 at the base of the core rod 1 are heated. to integrate.
５は加熱一体化部である。次いで、これを竪型あるいは
横型ガラス旋盤にチャック６で把持し回転を与えながら
カプラス用バーナ７を用いてクラッド石英管２の先端部
より加熱しカプラスして全長を一体化してブリフＡ−−
ムを製造する。5 is a heating integrated part. Next, this is held in a vertical or horizontal glass lathe with a chuck 6, and while being rotated, the tip of the clad quartz tube 2 is heated using a coupler burner 7, and the entire length is integrated with a coupler to form a brief A.
Manufacture products.
［発明が解決しようとりる問題点］
しかしながら、この方法では、コアロッド１の先端部が
クラッド石英管２と一体化される瞬間に、コアロッド１
の先端部が図中矢印で示すように半径方向に振れて芯ず
れを起こしてしまう。この原因はダミー管３とダミーロ
ッド４とを之、合けしながら一体化する時の熱歪が加熱
一体化部５などに残っていることによる。したがって、
芯合せ一体化時の応力の加わり方により、カプラス終了
後のプリフォームの偏心量には大きなばらつきがあった
。[Problems to be Solved by the Invention] However, in this method, at the moment when the tip of the core rod 1 is integrated with the clad quartz tube 2, the core rod 1
As shown by the arrow in the figure, the tip of the tip swings in the radial direction, causing misalignment. The cause of this is that the thermal strain that occurs when the dummy tube 3 and the dummy rod 4 are assembled and integrated remains in the heated integration portion 5 and the like. therefore,
Due to the way stress was applied during centering and integration, the amount of eccentricity of the preform after coupler completion varied greatly.
［発明の目的］
本発明は以上の従来技術の問題点を解消すべく創案され
たものであり１本発明の目的は、カプラス時のコアロッ
ドの芯ずれを防止し偏心のないプリフォームを得ること
ができる光ファイバのブリ７４−ム製造方法を提供づ゛
ることにある。[Object of the Invention] The present invention was devised to solve the above-mentioned problems of the prior art. 1. An object of the present invention is to prevent the core rod from being misaligned during coupling and to obtain a preform without eccentricity. It is an object of the present invention to provide a method for manufacturing an optical fiber beam.
［発明の概要１
上記目的を達成でるために、本発明においては、コアロ
ッドの基端側に軽い加熱により撓む熱可撓部をあらかじ
め形成してＪ３き、このコアロッドをクラッド石英管内
にＪＩＴｉ人する。このとき、コアロッドの先端部がク
ラッド石英管の先端内壁面から離間したフリーな状態に
する。次いで、クラッド石英管とコアロッドとの軸芯合
わせを行ないながら、上記熱可撓部よりｂ基端側のクラ
ッド石英管を加熱してクラッド石英管とコアロッドを一
体化する。しかる模、クラッド石英管をその先端から長
手方向に沿って順次加熱しカプラス一体化する。[Summary of the Invention 1] In order to achieve the above object, in the present invention, a thermoflexible portion that is bent by light heating is formed in advance on the proximal end side of the core rod, and this core rod is inserted into a clad quartz tube. do. At this time, the tip of the core rod is in a free state separated from the inner wall surface of the tip of the clad quartz tube. Next, while aligning the axes of the clad quartz tube and the core rod, the clad quartz tube on the proximal end b side of the thermally flexible portion is heated to integrate the clad quartz tube and the core rod. Then, the clad quartz tube is sequentially heated from its tip along its length to integrate the coupler.
このように、コアロッドの先端部をクラッド石英管から
離間させフリーな状態としている−ので、クラッド石英
管とコアロッドとの基端部での芯合せ一体化時に熱歪が
コアロッドに残留することがなく、その後のカプラス一
体化時にコアロッドが芯ずれを起こすことがない。更に
、芯合せ一体化時の加熱によりコアロッドの熱可撓部は
可撓性を持つため、コアロッドのｎｍを利用してクラッ
ド石英管とコアロッドどの芯合わぜをおこなうことがで
きる。したがって、カプラス一体化により偏心のないプ
リフォームが１７られる。In this way, since the tip of the core rod is separated from the clad quartz tube and left in a free state, thermal strain does not remain in the core rod when the clad quartz tube and core rod are aligned and integrated at the base end. , the core rod will not be misaligned during subsequent coupler integration. Furthermore, since the thermally flexible portion of the core rod becomes flexible due to heating during alignment and integration, the core rod and the clad quartz tube can be aligned using the nm of the core rod. Therefore, a preform 17 without eccentricity is obtained by coupler integration.
［実施例１
以下に本発明の実施例を添付図面に３．！づき説明する
。[Example 1] Examples of the present invention are shown below in the accompanying drawings. ! I will explain further.
第１図に示すように、コア【］ツラドの基端部には、一
部その径を細くし、比較的に軽い加熱により撓むことが
できるようにしだ熱度１尭部としてのくびれ部８が形成
されている。コアロッド１の基端には支持管９が接続さ
れている。コアロッド１に接続される支持管９の先端部
はテーパ部１０となっていると共に、テーバ部１０の先
端側にはカッター等により排気孔１１があけられている
。一方、コアロッド１が挿入されるクラッド石英管２の
基端にはダミー管３が接続されている。ダミー管３はイ
の一部が絞られており、支持管９のデーパ部１０を受け
るテーバ受は部１２が形成されている。As shown in Fig. 1, the proximal end of the core has a constricted part 8 whose diameter is partially reduced so that it can be bent by relatively light heating. is formed. A support tube 9 is connected to the base end of the core rod 1 . The tip of the support tube 9 connected to the core rod 1 has a tapered portion 10, and an exhaust hole 11 is formed at the tip of the tapered portion 10 using a cutter or the like. On the other hand, a dummy tube 3 is connected to the base end of the clad quartz tube 2 into which the core rod 1 is inserted. A portion of the dummy tube 3 is constricted, and a tapered receiver portion 12 is formed to receive the tapered portion 10 of the support tube 9.
まず、コアロッド１をクラッド石英管２内に挿入する。First, the core rod 1 is inserted into the clad quartz tube 2.
そうすると、支持管９のテーパ部１０とダミー管３のテ
ーパ受（）部１２とが合致し、コアロッド１はクラット
石英管２に対しほぼ同芯状に挿入される。このとき、コ
アロッド１の先端部【まクラッド石英管２の先端内壁面
とは離間しフリーな浮いた状態となっている。次に、ダ
ミー管３のテーバ受は部１２をその表面より軽く加熱し
テーバ受は部１２とテーバ部１０とを仮付けする。仮付
は後、更にテーバ受は部１２などを充分に加熱する。こ
の加熱、によりくびれ部８は可撓性を示すので、くびれ
部８の可撓性を利用してコアロツ１：１とクラッド石英
管２の軸芯が一致するように調整して両者を一体化する
。このあと、クラッド石英管２の両端側のダミー管３及
び支持棒１３を竪型ガラス旋盤（あるいは横型ガラス旋
笈）のヂトック６で把持し、回転を与えながらカプラス
用バーナ７によりコアロッド１先喘測のクラッド石英管
２の部分から加熱カプラスを開始し、順次コアロッド１
の長手方向に沿って全長をカプラス一体化しプリフォー
ムを造る。Then, the tapered portion 10 of the support tube 9 and the tapered receiving portion 12 of the dummy tube 3 match, and the core rod 1 is inserted into the cratted quartz tube 2 substantially concentrically. At this time, the tip of the core rod 1 is separated from the inner wall surface of the tip of the clad quartz tube 2 and is in a free floating state. Next, the Taber receiver of the dummy tube 3 heats the portion 12 slightly more than its surface, and the Taber receiver temporarily attaches the portion 12 and the Taper portion 10 together. After the temporary attachment, the Taper support portion 12 and the like are sufficiently heated. Due to this heating, the constriction part 8 exhibits flexibility, so the flexibility of the constriction part 8 is used to adjust the axes of the coreotsu 1:1 and the clad quartz tube 2 so that they match, and integrate the two. do. After this, the dummy tubes 3 and support rods 13 on both ends of the clad quartz tube 2 are gripped by a ditock 6 of a vertical glass lathe (or a horizontal glass lathe), and while being rotated, the tip of the core rod 1 is heated by a coupler burner 7. The heating coupler starts from the clad quartz tube 2 part of the measurement, and then the core rod 1
The entire length of the preform is integrated with the coupler along the longitudinal direction.
なお、上記実施例では、コアロッド１の熱可撓部が細径
のくびれ部８であったが、］コアロッドの１５端部に低
融点ガラスのロッド部を設けて熱可撓部どじてしよい。In the above embodiment, the thermoflexible portion of the core rod 1 is the small-diameter constricted portion 8, but the thermoflexible portion may be distorted by providing a rod portion of low melting point glass at the 15 end of the core rod. .
［発明の効果］
以上型するに本発明によれば、クラッド石英管とコアロ
ッドとの軸芯を合せながらてれらの基端側を加熱一体化
するときに、コアロッドの先端がフリーなので熱歪がコ
アロッドに残ることがなくカプラス一体化時にコアロッ
ドが芯ずれを生ぜず、Ｄつ熱可撓部の可撓性によりコア
［１ツドどクラッドＵＩ矢管との芯台ぜ゛をｔｊなうこ
とができるので、−心のないプリフォームを製）＾１゛
ることがでさる。[Effects of the Invention] To summarize, according to the present invention, when the axes of the clad quartz tube and the core rod are aligned and their base ends are heated and integrated, the tip of the core rod is free, so thermal distortion is avoided. The core rod does not remain on the core rod, and the core rod does not become misaligned when integrated with the coupler, and the flexibility of the thermo-flexible parts prevents the core from being dislocated between the core and the cladding UI tube. Therefore, it is possible to produce mindless preforms).
第１図は本発明に係る光ファイバのプリフォーム製造方
法を説明するための図、第２図は従来の光ファイバのプ
リフォーム製造方法を示ず図である。
図中、１はコアロッド、２はクラッド石英管、３はダミ
ー管、４はダミーロッド、５は加熱 体化部、６はチャ
ック、７はカプラス用バーナ、８はくびれ部、９は支持
管、１０はテーパ部、１１は排気孔、１２はテーバ受は
部、１３は支持棒である。
特許出願人 日立電線株式会社
代理人弁理士 絹 谷 信 帷○
Ｃ）
第１図
Ｃ）
第２図FIG. 1 is a diagram for explaining a method for manufacturing an optical fiber preform according to the present invention, and FIG. 2 is a diagram not showing a conventional method for manufacturing an optical fiber preform. In the figure, 1 is a core rod, 2 is a clad quartz tube, 3 is a dummy tube, 4 is a dummy rod, 5 is a heating body part, 6 is a chuck, 7 is a coupler burner, 8 is a constriction part, 9 is a support tube, 10 is a tapered portion, 11 is an exhaust hole, 12 is a tapered receiver portion, and 13 is a support rod. Patent Applicant Hitachi Cable Co., Ltd. Representative Patent Attorney Nobuaki Kinutani ○ C) Figure 1C) Figure 2
Claims (3)
部を形成し、コアロッドをその先端部をクラッド石英管
より離間した状態で挿入し、クラッド石英管とコアロッ
ドの軸芯を合せながら上記熱可撓部よりも基端側のクラ
ッド石英管を加熱してクラッド石英管とコアロッドを一
体化した後、クラッド石英管をその先端から長手方向に
沿つて順次加熱しカプラス一体化してプリフォームを製
造するようにしたことを特徴とする光ファイバのプリフ
ォーム製造方法。(1) Form a thermally flexible part on the proximal end of the core rod that bends when lightly heated, insert the core rod with its tip separated from the clad quartz tube, and align the axes of the clad quartz tube and core rod. After heating the clad quartz tube on the proximal end side of the thermo-flexible part to integrate the clad quartz tube and the core rod, the clad quartz tube is sequentially heated from its tip along the longitudinal direction to integrate the coupler and form a preform. 1. A method for manufacturing an optical fiber preform, characterized in that:
くびれ部であることを特徴とする特許請求の範囲第１項
記載の光ファイバのプリフォーム製造方法。(2) The method for manufacturing an optical fiber preform according to claim 1, wherein the thermally flexible portion is a constricted portion formed by forming the core rod to have a small diameter.
とする特許請求の範囲第１項記載の光ファイバのプリォ
ーム製造方法。(3) The method for manufacturing an optical fiber preform according to claim 1, wherein the thermally flexible portion is made of low melting point glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19947685A JPS6259547A (en) | 1985-09-11 | 1985-09-11 | Production of optical fiber preform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19947685A JPS6259547A (en) | 1985-09-11 | 1985-09-11 | Production of optical fiber preform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6259547A true JPS6259547A (en) | 1987-03-16 |
Family
ID=16408433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19947685A Pending JPS6259547A (en) | 1985-09-11 | 1985-09-11 | Production of optical fiber preform |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6259547A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100350479B1 (en) * | 2000-02-02 | 2002-08-28 | 삼성전자 주식회사 | Vertical support device of exhaust rotary unit in collapse and close apparatus |
| WO2002096816A1 (en) * | 2001-05-30 | 2002-12-05 | Pirelli & C. S.P.A. | Method of manufacturing glass optical fibre preforms and optical fibres |
| WO2003040050A1 (en) * | 2001-10-18 | 2003-05-15 | Research Institute Of Industrial Science & Technology | Preform for glass ferrule and fabrication method thereof |
| EP1598322A1 (en) * | 2004-05-15 | 2005-11-23 | Samsung Electronics Co., Ltd. | Method and apparatus for overcladding glass rod |
| US8161772B2 (en) * | 2004-06-11 | 2012-04-24 | Heraeus Quarzglas Gmbh & Co. Kg | Method for the production of an optical component made from quartz glass |
| EP2933239A4 (en) * | 2012-12-17 | 2016-10-12 | Zhongtian Technology Advanced Materials Co Ltd | Apparatus for manufacturing depressed cladding ultra-low water peak optical fiber core rod and method thereof |
-
1985
- 1985-09-11 JP JP19947685A patent/JPS6259547A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100350479B1 (en) * | 2000-02-02 | 2002-08-28 | 삼성전자 주식회사 | Vertical support device of exhaust rotary unit in collapse and close apparatus |
| WO2002096816A1 (en) * | 2001-05-30 | 2002-12-05 | Pirelli & C. S.P.A. | Method of manufacturing glass optical fibre preforms and optical fibres |
| CN100347109C (en) * | 2001-05-30 | 2007-11-07 | 皮雷利＆C·有限公司 | Method of manufacturing optical fibre preforms and optical fibres |
| WO2003040050A1 (en) * | 2001-10-18 | 2003-05-15 | Research Institute Of Industrial Science & Technology | Preform for glass ferrule and fabrication method thereof |
| US7467528B2 (en) | 2001-10-18 | 2008-12-23 | Research Institute Of Industrial Science & Technology | Method of fabricating dual hole glass ferrules |
| EP1598322A1 (en) * | 2004-05-15 | 2005-11-23 | Samsung Electronics Co., Ltd. | Method and apparatus for overcladding glass rod |
| US8161772B2 (en) * | 2004-06-11 | 2012-04-24 | Heraeus Quarzglas Gmbh & Co. Kg | Method for the production of an optical component made from quartz glass |
| EP2933239A4 (en) * | 2012-12-17 | 2016-10-12 | Zhongtian Technology Advanced Materials Co Ltd | Apparatus for manufacturing depressed cladding ultra-low water peak optical fiber core rod and method thereof |
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