JPH10182179A - Optical fiber preform and production of optical fiber using the same - Google Patents
Optical fiber preform and production of optical fiber using the sameInfo
- Publication number
- JPH10182179A JPH10182179A JP8355551A JP35555196A JPH10182179A JP H10182179 A JPH10182179 A JP H10182179A JP 8355551 A JP8355551 A JP 8355551A JP 35555196 A JP35555196 A JP 35555196A JP H10182179 A JPH10182179 A JP H10182179A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- pipe
- jacket
- tube
- joint member
- 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.)
- Granted
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
- C03B37/01211—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
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]
【発明の属する技術分野】本発明は、光ファイバーを製
造するに際し、ジャケット管を含む光ファイバ母材を延
伸炉内で加熱軟化して所定径の光ファイバ延伸材を得る
為の、光ファイバ母材と該母材を用いた光ファイバの製
造方法に関し、特に、より大きな光ファイバーの母材と
なるプリフォームの製造に用いられる合成石英ガラス製
の中空ガラス母材若しくは光ファイバの製造方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber preform for producing an optical fiber preform having a predetermined diameter by heating and softening an optical fiber preform including a jacket tube in a drawing furnace when producing an optical fiber. The present invention relates to a method for manufacturing an optical fiber using the base material and, more particularly, to a method for manufacturing a synthetic silica glass hollow glass base material or an optical fiber used for manufacturing a preform serving as a base material for a larger optical fiber.
【０００２】従来より光ファイバー母材の製造方法の一
つとしてジャケット法が行なわれているが、そのジャケ
ット法に用いられるジャケット管は、ファイバーリング
時の破断の問題から、天然石英ガラスから合成石英ガラ
スに置き換えられている。Conventionally, a jacket method has been used as one of the methods for producing an optical fiber preform. A jacket tube used in the jacket method is made of synthetic quartz glass from natural quartz glass due to the problem of breakage during fiber ring. Has been replaced by
【０００３】この合成ガラス製のジャケット管の製造
は、一般的にスート法と呼ばれる合成石英ガラスの製法
によって製造されている。しかし、この合成石英ガラス
製のジャケット管は、天然石英ガラスを原料とするジャ
ケット管に比べて、その価格が高く、光ファイバー母材
のプリフォームを製造する場合コストが大幅に上昇して
しまう。The jacket tube made of synthetic glass is manufactured by a synthetic quartz glass manufacturing method generally called a soot method. However, the jacket tube made of synthetic quartz glass is higher in price than a jacket tube made of natural quartz glass as a raw material, and the cost for manufacturing a preform of an optical fiber preform is greatly increased.
【０００４】近年、光ファイバーは、単一ファイバーで
の長距離化を実現することで、それに係わるコストを低
減しようとしており、その傾向は益々顕著になる一方で
ある。[0004] In recent years, the optical fiber has been trying to reduce the cost associated with it by realizing a longer distance with a single fiber, and the tendency is becoming more and more remarkable.
【０００５】このような理由から、光ファイバーは益々
長距離化を目指し、その母材となるプリフォームも大型
化している。この為当然ながら、破断頻度を少なくする
ために、ジャケット法によりプリフォームを製造する場
合には、合成石英ガラス製のジャケット管を使用してい
るが、先にも述べたように、現状では合成石英ガラス管
は、天然石英ガラス管に比べて、コストが高いため、光
ファイバーを製造する場合、コストを低減するために様
々な工夫が検討されている。[0005] For these reasons, the optical fiber is aiming for a longer distance, and the preform as a base material thereof is also becoming larger. For this reason, of course, in order to reduce the frequency of breakage, when manufacturing a preform by the jacket method, a synthetic quartz glass jacket tube is used. The quartz glass tube has a higher cost than the natural quartz glass tube, and therefore, when manufacturing an optical fiber, various devices are being studied to reduce the cost.
【０００６】その一例として、光ファイバー製造時に、
合成石英ガラスのジャケット部の全てを有効に利用する
ために、合成石英ガラスのジャケット管の両端に安価な
天然石英ガラスのダミー管をプロパンバーナー又は酸水
素バーナーを用いて溶着し、片端をファイバー製造時の
スタートロスの部分として使用し、もう片端をファイバ
ー製造時の終了時のロスとプリフォーム保持のための保
治具として使用し、プリフォームのロスを最小限にする
よう方策が種々開示されている。As an example, when manufacturing an optical fiber,
In order to effectively use all of the synthetic quartz glass jacket, an inexpensive natural quartz glass dummy tube is welded to both ends of the synthetic quartz glass jacket tube using a propane burner or oxyhydrogen burner, and one end is made of fiber. Various measures have been disclosed to minimize the loss of the preform by using it as a start loss part at the time and using the other end as a jig for holding the loss and preform at the end of fiber production. I have.
【０００７】[0007]
【発明が解決しようとする課題】例えば特開平５−２７
９０６９号において例えば図３に示すように、コアロッ
ド８とクラッド１よりなる母材の両端に、母材と同径の
天然石英ガラス材からなるダミー材２０を接合した技術
を開示しているが、前記ダミー材２０は中実棒の為に、
初期加熱するまでの時間が長くなるのみならず、コアロ
ッド８とクラッド１よりなる母材の端面とダミー材２０
との境界線が面一の為に、その境界線付近の線引きが円
滑に行い得ないという欠点を有していた。SUMMARY OF THE INVENTION For example, Japanese Patent Laid-Open No. Hei 5-27
No. 9069 discloses a technique in which a dummy material 20 made of a natural quartz glass material having the same diameter as the base material is joined to both ends of a base material formed of a core rod 8 and a clad 1 as shown in FIG. 3, for example. The dummy material 20 is a solid bar,
Not only the time until the initial heating is increased, but also the end face of the base material including the core rod 8 and the clad 1 and the dummy material 20.
Since the boundary line between them is flush with each other, there is a drawback that drawing around the boundary line cannot be performed smoothly.
【０００８】特に、光ファイバーの長距離化に伴うプリ
フォーム（母材）の大型化の場合、前記欠点は一層助長
されてしまうのみならず、ダミー材は母材と同径の為
に、その重量負担は極めて大であり、加熱炉内への吊下
が困難になってしまう場合がある。更にダミー材は１つ
の線引き工程（加熱軟化延伸工程）毎に廃棄しなければ
ならず、その費用負担も大である。In particular, when the preform (base material) is enlarged due to the increase in the distance of the optical fiber, the above-mentioned disadvantage is not only further promoted, but also because the dummy material has the same diameter as the base material, the weight of the dummy material increases. The burden is extremely large, and it may be difficult to suspend the heating furnace. Further, the dummy material must be discarded for each drawing step (heating softening and stretching step), which is costly.
【０００９】本発明はかかる従来技術の欠点に鑑み、特
に光ファイバーの長距離化に伴うプリフォームの大型化
により、ジャケット管（クラッド母材）も大型化した場
合においても加熱軟化延伸時にロス部分として消失する
部分を極力少なくし、これにより製造コストの低減を図
ることを可能とした光ファイバ母材と該母材を用いた光
ファイバ延伸材の製造方法を提供することにある。In view of the drawbacks of the prior art, the present invention has a loss portion during heat softening and stretching even when the jacket tube (cladding base material) is enlarged due to the increase in the size of the preform due to the extension of the optical fiber. An object of the present invention is to provide an optical fiber preform and a method of manufacturing an optical fiber stretched material using the preform, which can reduce the disappearing portion as much as possible and thereby reduce the manufacturing cost.
【００１０】[0010]
【課題を解決するための手段】請求項１記載の発明は、
光ファイバーの母材となるジャケット管（クラッド母
材）の片端もしくは両端に、ジョイント部材を介して前
記ジャケット管より小径のダミー管を接合するととも
に、前記ジョイント部材及びダミー管をジャケット管肉
厚より薄肉の中空管で形成したことを特徴とする。勿
論、この場合前記ダミー管は天然石英ガラス管を用いて
も良く、又母材となるべき合成石英ガラス管より低品質
の合成石英ガラス材を用いても良い。According to the first aspect of the present invention,
A dummy pipe smaller in diameter than the jacket pipe is joined to one or both ends of a jacket pipe (cladding base material) serving as a base material of the optical fiber via a joint member, and the joint member and the dummy pipe are thinner than the thickness of the jacket pipe. Characterized by being formed of a hollow tube. Of course, in this case, the dummy tube may be a natural quartz glass tube or a synthetic quartz glass material of lower quality than a synthetic quartz glass tube to be a base material.
【００１１】かかる構成によれば、前記ジャケット管よ
り小径の中空のダミー管を接合している為に、その重量
負担を大幅に軽減でき、容易にジャケット管の大型化を
達成した場合でも加熱炉内への吊下が容易である。又前
記ダミー管は母材に直接接合されているのではなく、ジ
ョイント部材を介して接合されているために、線引き工
程（加熱軟化延伸工程）毎にジョイント部材は廃棄する
も、ダミー管は再使用が可能である。According to this structure, since the hollow dummy pipe having a smaller diameter than the jacket pipe is joined, the weight burden can be greatly reduced, and even if the jacket pipe can be easily enlarged, the heating furnace can be used. Hanging inside is easy. Further, since the dummy tube is not directly joined to the base material but is joined via a joint member, the joint member is discarded in each drawing step (heating / softening / stretching step), but the dummy tube is re-used. Can be used.
【００１２】請求項２記載の発明は前記ジョイント部材
のジャケット管側の内径をジャケット管内径より大径に
形成したものである。かかる発明によれば、前記ジョイ
ント部材の内径空間内にジャケット管に内挿したコア材
を突設する事が出来、これによりジャケット管より先に
加熱軟化されにくいコア材を先に加熱する事が出来、母
材先端側より前記線引を円滑に行うことが出来、母材の
一層の無駄がなくなる。又前記ジョイント部材はジャケ
ット管側を大径に、ダミー管側を小径に、略断面テーパ
状（円錐台状も含む）に形成するのがよい。According to a second aspect of the present invention, the inner diameter of the joint member on the jacket tube side is formed larger than the inner diameter of the jacket tube. According to this invention, the core material inserted in the jacket tube can be protruded into the inner diameter space of the joint member, and thereby, the core material that is not easily softened and heated earlier than the jacket tube can be heated first. As a result, the drawing can be performed smoothly from the front end of the base material, and the waste of the base material can be further reduced. Further, the joint member is preferably formed to have a large diameter on the jacket tube side and a small diameter on the dummy tube side, and to have a substantially tapered cross section (including a truncated cone shape).
【００１３】請求項４記載の発明は、コア部を装入した
ジャケット管を、該コア部と一体的に延伸炉内に装入し
て加熱軟化して所定径の光ファイバを製造する光ファイ
バ製造方法に適用されるもので、前記ジャケット管の片
端もしくは両端に、ジョイント部材を介して前記ジャケ
ット管より小径のダミー管を接合するとともに、前記ジ
ョイント部材及びダミー管をジャケット管肉厚より薄肉
の中空管で形成するとともに、前記コア部先端をジョイ
ント部材内の中空域まで突設させた状態で、前記ジョイ
ント部より延伸炉内で加熱軟化して光ファイバを製造す
ることを特徴とする。この場合、請求項５に記載のよう
に、前記ジョイント部材のジャケット管側の内径をジャ
ケット管内径より大径に形成し、前記コア部先端がジョ
イント部材内径に非接触の状態でジョイント部材内の中
空域まで突設させるのがよい。According to a fourth aspect of the present invention, there is provided an optical fiber for manufacturing an optical fiber having a predetermined diameter by heating and softening a jacketed tube in which a core portion has been inserted into a drawing furnace integrally with the core portion. Applied to a manufacturing method, a dummy pipe having a smaller diameter than the jacket pipe is joined to one end or both ends of the jacket pipe via a joint member, and the joint member and the dummy pipe are thinner than the jacket pipe wall thickness. An optical fiber is produced by forming a hollow tube and softening the joint portion by heating in a drawing furnace with the distal end of the core portion protruding to a hollow region in the joint member. In this case, as described in claim 5, the inner diameter of the joint member on the jacket tube side is formed to be larger than the inner diameter of the jacket tube, and the core end is not in contact with the inner diameter of the joint member. It is good to protrude to the hollow area.
【００１４】[0014]
【発明の実施の形態】以下、図面を参照して本発明の好
適な実施例を例示的に詳しく説明する。但しこの実施例
に記載されている構成部品の寸法、材質、形状、その相
対的配置等は特に特定的な記載がないかぎりは、この発
明の範囲をそれに限定する趣旨ではなく、単なる説明例
にすぎない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be illustratively described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only.
【００１５】図１は前記ジャケット管１の先端と後端に
夫々、ジョイント管２Ａ、２Ｂを介してダミー管６、７
を接合するとともに、前記後端側に設けたダミー管７
は、母材保持用ダミーパイプとして機能し、前記ジョイ
ント管２Ａ上端部と内／外径を同一にして溶着され、上
側外径をリング状に削成７ａし、上下移動装置３により
上下動する母材ホルダー４を係合する。下側ダミー管６
も同様に前記ジョイント管２Ｂ下端部と内／外径を同一
にして溶着され、その先端側に不図示の線引用引張部材
を設ける。FIG. 1 shows dummy pipes 6 and 7 at the front and rear ends of the jacket pipe 1 via joint pipes 2A and 2B, respectively.
And a dummy tube 7 provided on the rear end side.
Functions as a dummy pipe for holding the base material, is welded with the same inner / outer diameter as the upper end of the joint pipe 2A, cuts the upper outer diameter into a ring shape 7a, and moves up and down by the vertical moving device 3. The base material holder 4 is engaged. Lower dummy tube 6
Similarly, the joint pipe 2B is welded with the same inner / outer diameter as the lower end thereof, and a drawing tension member (not shown) is provided at the front end thereof.
【００１６】前記ジャケット管１下端側に夫々固着され
るジョイント管２Ｂとダミー管６の断面構成を図２に示
す。図２（Ａ）は円筒部と円錐台部が一体化した略テー
パ状のジョイント管２Ｂで、クラッドとして機能するジ
ャケット管と接合される基側（拡径側）は、該ジャケッ
ト管１外径と同一にして、その内径をジャケット管１内
径より大径に形成してる。又、ダミー管６と接続される
先側（縮径側）は、該ダミー管６と内／外径を同一にし
て溶着している。従って前記ジョイント管２Ｂ及びダミ
ー管６はジャケット管肉厚より薄肉の中空管で形成され
ることになる。FIG. 2 shows a sectional configuration of the joint pipe 2B and the dummy pipe 6 which are fixed to the lower end side of the jacket pipe 1, respectively. FIG. 2A shows a substantially tapered joint tube 2B in which a cylindrical portion and a truncated cone portion are integrated, and the base side (increased diameter side) to be joined to the jacket tube functioning as a clad is the outer diameter of the jacket tube 1. And the inner diameter is made larger than the inner diameter of the jacket tube 1. The front side (reduced diameter side) connected to the dummy tube 6 is welded to the dummy tube 6 with the same inner / outer diameter. Therefore, the joint pipe 2B and the dummy pipe 6 are formed as hollow pipes having a wall thickness smaller than the jacket pipe wall thickness.
【００１７】そして前記ジャケット管１内にはコアロッ
ド８が挿入されるが、前記コアロッド８先端がジョイン
ト管２Ｂ内径に非接触の状態でジョイント管２Ｂ内の中
空域２ａまで突設させている。尚、本実施例の場合ジョ
イント管２Ｂを、単なるテーパ状ではなく、円筒部と円
錐台部が一体化した略テーパ状にした理由は、前記コア
ロッド８先端がジョイント管２Ｂ内径に非接触の状態で
ジョイント管中空域２ａまで円滑に所定長さ分突設出来
る為である。A core rod 8 is inserted into the jacket tube 1. The core rod 8 has a tip projecting to a hollow area 2a in the joint tube 2B in a state of not contacting the inner diameter of the joint tube 2B. In the case of the present embodiment, the reason why the joint pipe 2B is not a simple taper shape but a substantially tapered shape in which a cylindrical portion and a truncated cone portion are integrated is that the tip of the core rod 8 is not in contact with the inner diameter of the joint tube 2B. Therefore, the joint pipe can be smoothly protruded by a predetermined length to the hollow area 2a.
【００１８】そして前記ジョイント管２Ｂの長さは、例
えばジャケット管１の長さが５ｍ、電気炉５の全長が２
３００ｍｍの場合に、ジャケット管１先端に接合するジ
ャケット管引き始めのロスを解消し得る程度の長さで良
く、従って電気炉５の全長より大幅に小の２００ｍｍ若
しくはそれ以上に設定すれば、その先端側に設けたダミ
ー管６の加熱変形が一部で済み再使用可能となる。この
場合ジョイント管２Ａ、２Ｂはダミー管６、７が先に軟
化しない程度の長さが必要であるが、一方では電気炉５
の全長より長くする必要がない。そこで前記ジョイント
管２Ａ、２Ｂは２００ｍｍ以上であってせいぜい５００
〜８００ｍｍに設定すればよい。The length of the joint pipe 2B is, for example, that the length of the jacket pipe 1 is 5 m and the total length of the electric furnace 5 is 2 m.
In the case of 300 mm, the length may be such that the loss at the beginning of drawing the jacket tube joined to the end of the jacket tube 1 can be eliminated. Therefore, if the length is set to 200 mm or more, which is significantly smaller than the entire length of the electric furnace 5, the Heating deformation of the dummy tube 6 provided on the distal end side is partially completed, and the dummy tube 6 can be reused. In this case, the joint pipes 2A and 2B need to have a length that does not cause the dummy pipes 6 and 7 to soften first.
Need not be longer than the full length of Therefore, the joint pipes 2A and 2B are 200 mm or more and at most 500 mm.
It may be set to ~ 800 mm.
【００１９】又前記ジョイント管２Ｂは、図２（Ｂ）、
（Ｃ）に示すようにテーパ状若しくは中腹部をくびらせ
たやせテーパ状に形成してもよいが、いずれも前記ジャ
ケット管内に挿入されるコアロッド先端が非接触の状態
でジョイント管２Ｂ内の中空域２ａまで突設させている
ことが必要である。The joint pipe 2B is shown in FIG.
As shown in (C), it may be formed in a tapered shape or a thin tapered shape in which a middle part is narrowed, but in any case, the tip of the core rod inserted into the jacket tube is not in contact with the inside of the joint tube 2B. It is necessary to protrude to the hollow area 2a.
【００２０】かかる実施例によれば前記ジャケット管１
先端に接合したジョイント管２Ｂをコアロッド８と一体
的に電気炉５に入れ加熱軟化した後、不図示の延伸手段
を利用してジョイント管２Ｂ側より延伸すると、引き始
め当初においては図１（Ｂ）に示すように、先端がドー
ム状になるが、そのロス部分はジョイント管２Ｂであ
り、問題となることがない。According to this embodiment, the jacket tube 1
After the joint pipe 2B joined to the distal end is placed in the electric furnace 5 together with the core rod 8 and heated and softened, the joint pipe 2B is stretched from the joint pipe 2B side by using a stretching means (not shown). As shown in ()), the tip is dome-shaped, but the loss portion is the joint pipe 2B, and there is no problem.
【００２１】又ジョイント管２Ｂ先端のダミー管６も加
熱されるが、その加熱程度は低く、延伸するまでに至ら
ない。従って該ダミー管６の再使用も可能である。又前
記コアロッド８はジャケット管１内に挿入され、又加熱
はジャケット管１外周側より加熱されるために、前記ジ
ャケット管１を大口径化した場合コアロッド８まで十分
加熱されない恐れがあるが、本実施例はジャケット管１
先端より前記コアロッド８先端をジョイント管２Ｂ内の
中空域まで突設させている為に、ジョイント管２Ｂとと
もにコアロッド８が加熱軟化し、その後ジャケット管１
が加熱されるために、ジャケット管１とコアロッド８を
含めた母材全体が均一加熱され、円滑に延伸が出来、高
精度の光ファイバの製造が可能となる。Further, the dummy tube 6 at the end of the joint tube 2B is also heated, but the degree of heating is low and does not extend. Therefore, the dummy tube 6 can be reused. Further, since the core rod 8 is inserted into the jacket tube 1 and is heated from the outer peripheral side of the jacket tube 1, the core rod 8 may not be sufficiently heated when the jacket tube 1 is enlarged in diameter. Example is a jacket tube 1
Since the distal end of the core rod 8 protrudes from the distal end to the hollow area in the joint pipe 2B, the core rod 8 is heated and softened together with the joint pipe 2B.
Is heated, the entire preform including the jacket tube 1 and the core rod 8 is uniformly heated, can be drawn smoothly, and a high-precision optical fiber can be manufactured.
【００２２】一方、図１（Ｃ）に示すように引き終わり
時において、ジョイント管２Ａ接合付近まで延伸させる
事により、母材保持用ダミー管２も溶融されず再使用が
可能である。従って引き始め、引き終わり時のいずれの
場合も加熱軟化延伸されるのはジョイント管２Ａ、２Ｂ
のみでダミー管６、７まではほとんど延伸されないため
に再使用が可能である。On the other hand, as shown in FIG. 1C, at the end of the drawing, the dummy tube 2 for holding the base material can be reused without being melted by extending it to the vicinity of the joint of the joint tube 2A. Therefore, the joint pipes 2A and 2B are heat-softened and stretched at both the start and end of the drawing.
Only the dummy tubes 6 and 7 are hardly stretched and can be reused.
【００２３】[0023]
【発明の効果】以上記載した如く本発明によれば、特に
光ファイバーの長距離化に伴うプリフォームの大型化に
伴い、ジャケット管も大型化した場合においても加熱軟
化延伸時にロス部分として消失する部分を極力少なく
し、これにより製造コストの低減を図ることが出来ると
ともにダミー管の再使用が可能である。As described above, according to the present invention, the portion which disappears as a loss portion at the time of heat softening and stretching even when the jacket tube is enlarged with the increase in the size of the preform due to the increase in the length of the optical fiber. Is reduced as much as possible, whereby the production cost can be reduced and the dummy tube can be reused.
【図１】本発明の実施形態による概略構成図を示し、
（Ａ）は全体構成図、（Ｂ）は引き始めの状態、（Ｃ）
は引き終わりの状態を示す。FIG. 1 shows a schematic configuration diagram according to an embodiment of the present invention,
(A) is an overall configuration diagram, (B) is a state of starting pulling, (C)
Indicates the state at the end of the drawing.
【図２】（Ａ）、（Ｂ）、（Ｃ）はジョイント管とダミ
ー管を取り付けた母材の先端部の断面形状を示す。FIGS. 2A, 2B, and 2C show cross-sectional shapes of a front end portion of a base material to which a joint pipe and a dummy pipe are attached.
【図３】母材にダミー管を接合した従来技術の断面図を
示す。FIG. 3 shows a cross-sectional view of a prior art in which a dummy tube is joined to a base material.
１ ジャケット管、 ２Ａ、２Ｂ ジョイント管 ３ 上下移動装置 ４ 母材ホルダー ５ 電気炉 ６、７ ダミー管 ８ コアロッド DESCRIPTION OF SYMBOLS 1 Jacket pipe, 2A, 2B joint pipe 3 Vertical moving device 4 Base material holder 5 Electric furnace 6, 7 Dummy pipe 8 Core rod
Claims (5)
の片端もしくは両端に、ジョイント部材を介して前記ジ
ャケット管より小径のダミー管を接合するとともに、前
記ジョイント部材及びダミー管をジャケット管肉厚より
薄肉の中空管で形成したことを特徴とする光ファイバ母
材。1. A dummy pipe having a smaller diameter than the jacket pipe is joined to one end or both ends of a jacket pipe serving as a base material of the optical fiber via a joint member, and the joint member and the dummy pipe are made thinner than the thickness of the jacket pipe. An optical fiber preform formed of a hollow tube.
内径をジャケット管内径より大径に形成した請求項１記
載の光ファイバ母材。2. The optical fiber preform according to claim 1, wherein the inner diameter of the joint member on the jacket tube side is formed larger than the inner diameter of the jacket tube.
大径に、ダミー管側を小径に、略断面テーパ状に形成し
た請求項１記載の光ファイバ母材。3. The optical fiber preform according to claim 1, wherein the joint member is formed to have a large diameter on the jacket tube side, a small diameter on the dummy tube side, and a substantially tapered cross section.
ア部と一体的に延伸炉内に装入して加熱軟化して所定径
の光ファイバを製造する光ファイバ製造方法において、 ジャケット管の片端もしくは両端に、ジョイント部材を
介して前記ジャケット管より小径のダミー管を接合する
とともに、前記ジョイント部材及びダミー管をジャケッ
ト管肉厚より薄肉の中空管で形成するとともに、前記コ
ア部先端をジョイント部材内の中空域まで突設させた状
態で、前記ジョイント部より延伸炉内で加熱軟化して光
ファイバを製造することを特徴とする光ファイバの製造
方法。4. A method for producing an optical fiber having a predetermined diameter, wherein a jacketed tube having a core portion inserted therein is inserted into a drawing furnace integrally with the core portion and heated and softened to produce an optical fiber having a predetermined diameter. A dummy pipe smaller in diameter than the jacket pipe is joined to one end or both ends of the pipe via a joint member, and the joint member and the dummy pipe are formed of a hollow pipe thinner than the thickness of the jacket pipe. And producing an optical fiber by heating and softening the joint portion in a drawing furnace in a state where the optical fiber is protruded to a hollow area in the joint member.
内径をジャケット管内径より大径に形成し、前記コア部
先端がジョイント部材内径に非接触の状態でジョイント
部材内の中空域まで突設させた請求項４記載の光ファイ
バ母材の製造方法。5. The inner diameter of the joint member on the jacket tube side is formed to be larger than the inner diameter of the jacket tube, and the tip of the core portion protrudes to a hollow area in the joint member without being in contact with the inner diameter of the joint member. A method for producing an optical fiber preform according to claim 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35555196A JP3714571B2 (en) | 1996-12-24 | 1996-12-24 | Optical fiber preform and method of manufacturing optical fiber using the preform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35555196A JP3714571B2 (en) | 1996-12-24 | 1996-12-24 | Optical fiber preform and method of manufacturing optical fiber using the preform |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10182179A true JPH10182179A (en) | 1998-07-07 |
| JP3714571B2 JP3714571B2 (en) | 2005-11-09 |
Family
ID=18444579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35555196A Expired - Fee Related JP3714571B2 (en) | 1996-12-24 | 1996-12-24 | Optical fiber preform and method of manufacturing optical fiber using the preform |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3714571B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0994077A2 (en) * | 1998-10-16 | 2000-04-19 | Heraeus Quarzglas GmbH & Co. KG | Quartz glass tube having tapered groove and method for producing preform for optical fibers using the same |
| WO2006075461A1 (en) * | 2005-01-14 | 2006-07-20 | Shin-Etsu Chemical Co., Ltd. | Drawing method of optical fiber |
| DE102005044947A1 (en) * | 2005-09-20 | 2007-03-22 | Heraeus Tenevo Gmbh | Sealing method for connecting two components made from a material containing a high amount of silicic acid used e.g. in the production of optical fibers comprises heating and softening the components in the region of the connecting surfaces |
| JP2008509874A (en) * | 2004-08-14 | 2008-04-03 | ヘレーウス テネーヴォ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Stretching method for producing quartz glass optical components and spare products suitable for carrying out this method |
| CN103739193A (en) * | 2013-12-16 | 2014-04-23 | 江苏亨通光电股份有限公司 | Production method for optical fiber preform conical head |
| CN103771698A (en) * | 2014-01-13 | 2014-05-07 | 武汉市艾玻睿光电科技有限公司 | Manufacturing method of precision glass capillary tube |
| JP2014201494A (en) * | 2013-04-05 | 2014-10-27 | 株式会社フジクラ | Optical fiber preform for drawing, optical fiber preform for drawing with connector, and drawing method |
| US20170240455A1 (en) * | 2014-08-13 | 2017-08-24 | Heraeus Tenevo Llc | System and method for forming a quartz glass optical component |
| JP2017206432A (en) * | 2016-05-03 | 2017-11-24 | ヘレーウス テネーヴォ エルエルシーＨｅｒａｅｕｓ Ｔｅｎｅｖｏ Ｌｌｃ | Drawing method and preform for manufacturing optical glass component |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0483726A (en) * | 1990-07-23 | 1992-03-17 | Hitachi Cable Ltd | Method for drawing glass base material |
| JPH07109136A (en) * | 1992-11-19 | 1995-04-25 | Shinetsu Quartz Prod Co Ltd | Large-sized quartz glass pipe, large-sized quartz glass preform and their preparation |
| JPH08277138A (en) * | 1995-04-04 | 1996-10-22 | Mitsubishi Cable Ind Ltd | Production of glass base material for optical fiber |
| JPH09221334A (en) * | 1995-12-06 | 1997-08-26 | Sumitomo Electric Ind Ltd | Method for stretching glass preform |
-
1996
- 1996-12-24 JP JP35555196A patent/JP3714571B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0483726A (en) * | 1990-07-23 | 1992-03-17 | Hitachi Cable Ltd | Method for drawing glass base material |
| JPH07109136A (en) * | 1992-11-19 | 1995-04-25 | Shinetsu Quartz Prod Co Ltd | Large-sized quartz glass pipe, large-sized quartz glass preform and their preparation |
| JPH08277138A (en) * | 1995-04-04 | 1996-10-22 | Mitsubishi Cable Ind Ltd | Production of glass base material for optical fiber |
| JPH09221334A (en) * | 1995-12-06 | 1997-08-26 | Sumitomo Electric Ind Ltd | Method for stretching glass preform |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0994077A3 (en) * | 1998-10-16 | 2000-06-28 | Heraeus Quarzglas GmbH & Co. KG | Quartz glass tube having tapered groove and method for producing preform for optical fibers using the same |
| EP0994077A2 (en) * | 1998-10-16 | 2000-04-19 | Heraeus Quarzglas GmbH & Co. KG | Quartz glass tube having tapered groove and method for producing preform for optical fibers using the same |
| US8015846B2 (en) | 2004-08-14 | 2011-09-13 | Heraeus Quarzglas Gmbh & Co. Kg | Elongation method for producing an optical component of quartz glass and preliminary product suited for performing the method |
| JP2008509874A (en) * | 2004-08-14 | 2008-04-03 | ヘレーウス テネーヴォ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Stretching method for producing quartz glass optical components and spare products suitable for carrying out this method |
| JP4520862B2 (en) * | 2005-01-14 | 2010-08-11 | 信越化学工業株式会社 | Optical fiber drawing method |
| WO2006075461A1 (en) * | 2005-01-14 | 2006-07-20 | Shin-Etsu Chemical Co., Ltd. | Drawing method of optical fiber |
| JP2006193379A (en) * | 2005-01-14 | 2006-07-27 | Shin Etsu Chem Co Ltd | Method for drawing optical fiber |
| DE102005044947A1 (en) * | 2005-09-20 | 2007-03-22 | Heraeus Tenevo Gmbh | Sealing method for connecting two components made from a material containing a high amount of silicic acid used e.g. in the production of optical fibers comprises heating and softening the components in the region of the connecting surfaces |
| DE102005044947B4 (en) * | 2005-09-20 | 2007-10-04 | Heraeus Tenevo Gmbh | Welding method for joining components made of high-siliceous material, as well as apparatus for carrying out the method |
| JP2014201494A (en) * | 2013-04-05 | 2014-10-27 | 株式会社フジクラ | Optical fiber preform for drawing, optical fiber preform for drawing with connector, and drawing method |
| CN103739193A (en) * | 2013-12-16 | 2014-04-23 | 江苏亨通光电股份有限公司 | Production method for optical fiber preform conical head |
| CN103771698A (en) * | 2014-01-13 | 2014-05-07 | 武汉市艾玻睿光电科技有限公司 | Manufacturing method of precision glass capillary tube |
| US20170240455A1 (en) * | 2014-08-13 | 2017-08-24 | Heraeus Tenevo Llc | System and method for forming a quartz glass optical component |
| JP2017206432A (en) * | 2016-05-03 | 2017-11-24 | ヘレーウス テネーヴォ エルエルシーＨｅｒａｅｕｓ Ｔｅｎｅｖｏ Ｌｌｃ | Drawing method and preform for manufacturing optical glass component |
| US11618708B2 (en) | 2016-05-03 | 2023-04-04 | Heraeus Quartz North America Llc | Elongation method and preform for producing an optical glass component |
| US11840472B2 (en) | 2016-05-03 | 2023-12-12 | Heraeus Quartz North America Llc | Elongation method and preform for producing an optical glass component |
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