JPH07234322A - Method for drawing plastic optical fiber - Google Patents
Method for drawing plastic optical fiberInfo
- Publication number
- JPH07234322A JPH07234322A JP6024137A JP2413794A JPH07234322A JP H07234322 A JPH07234322 A JP H07234322A JP 6024137 A JP6024137 A JP 6024137A JP 2413794 A JP2413794 A JP 2413794A JP H07234322 A JPH07234322 A JP H07234322A
- Authority
- JP
- Japan
- Prior art keywords
- fiber
- preform
- optical fiber
- plastic optical
- strength
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、プラスチック光ファイ
バの線引方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for drawing a plastic optical fiber.
【０００２】[0002]
【従来の技術】コア及びクラッドが共にプラスチックの
光ファイバは、例えば、光通信の送受を行う電子装置間
において、その伝送損失が問題にされない近距離の光伝
送路として、ガラスファイバに比べて使いやすく低価格
なため多用されており、特に、ＬＡＮ，ＩＳＤＮ等の次
世代通信網構想において重要となっている。2. Description of the Related Art An optical fiber whose core and clad are both plastic is used as a short-distance optical transmission line between electronic devices for transmitting and receiving optical communication, as compared with glass fiber, in which transmission loss is not a problem. It is widely used because it is easy and low-priced, and is especially important in the concept of next-generation communication networks such as LAN and ISDN.
【０００３】プラスチック光ファイバとしては、図２に
示す屈折率分布を有するステップインデックス（ＳＩ）
型ファイバが実用化されているが、このファイバは伝送
容量が少なく、通信用としては適していない。通信用と
して用いるためには、図３に示す屈折率分布を有する伝
送容量の多いグレーデッドインデックス（ＧＩ）型ファ
イバを用いる必要がある。As a plastic optical fiber, a step index (SI) having a refractive index distribution shown in FIG.
Type fiber has been put to practical use, but this fiber has a small transmission capacity and is not suitable for communication. In order to use it for communication, it is necessary to use a graded index (GI) type fiber having a large transmission capacity and having a refractive index distribution shown in FIG.
【０００４】従来、プラスチック光ファイバを製造する
方法としては、例えば、特開平４−１２４６０２号にみ
られるように、コア材を所定の径に紡糸して、その上に
クラッド材をコーティングする方法が用いられている
が、この方法でＧＩ型プラスチック光ファイバを作製す
るためには、何段階にもコーティングを行わなければな
らず工程が煩雑である。Conventionally, as a method of manufacturing a plastic optical fiber, for example, as disclosed in Japanese Patent Laid-Open No. 4-124602, a method of spinning a core material to a predetermined diameter and coating a clad material thereon is known. Although used, in order to manufacture a GI type plastic optical fiber by this method, coating must be performed in multiple steps, and the process is complicated.
【０００５】[0005]
【発明が解決しようとする課題】そこで、ＧＩ型プリフ
ォームを合成して、加熱し、溶融させファイバ化すると
工程を少なくすることが可能であり、外径の異なる様々
なファイバを作製することが可能である。しかしなが
ら、ＧＩ型プリフォームを線引炉に挿入して線引きする
方法では、線引張力が低い場合、分子の配向が少なくフ
ァイバの強度が低いという問題があった。Therefore, it is possible to reduce the number of steps by synthesizing a GI type preform, heating it, melting it, and making it into a fiber, and it is possible to produce various fibers having different outer diameters. It is possible. However, the method of inserting the GI type preform into the drawing furnace and drawing the wire has a problem that the molecular orientation is small and the fiber strength is low when the drawing tension is low.
【０００６】本発明は、上記従来技術に鑑みてなされた
ものであり、ファイバ化された時の機械強度を維持し、
プラスチック光ファイバとしての長期信頼性を保証でき
る線引方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 prior art, and maintains the mechanical strength when formed into a fiber,
It is an object of the present invention to provide a drawing method capable of guaranteeing long-term reliability as a plastic optical fiber.
【０００７】[0007]
【課題を解決するための手段】斯かる目的を達成する本
発明の構成は所定の屈折率を有するコア及びクラッドが
プラスチックで形成されてなるプリフォームを加熱し、
溶融させて所定の外径に紡糸するプラスチック光ファイ
バの線引方法において、前記ファイバが巻き取られるま
での線引張力が１０ｇ以上であることを特徴とする。ま
た、上記プリフォームを加熱し、溶融させて紡糸する際
の外径は１０００μｍ以下であることが望ましい。The structure of the present invention for attaining such an object is to heat a preform in which a core and a clad having a predetermined refractive index are formed of plastic,
A method for drawing a plastic optical fiber in which the fiber is melted and spun to a predetermined outer diameter, is characterized in that a drawing force until the fiber is wound is 10 g or more. The outer diameter of the preform when heated, melted, and spun is preferably 1000 μm or less.
【０００８】[0008]
【作用】高分子であるプラスチックは、配向が小さいと
分子がランダム構造をとるために引っ張られた時の強度
が弱くなる。ファイバの外径が１０００μｍ以上の場合
は分子の配向が小さくても強度低下は見られないが、１
０００μｍ以下の場合は強度の低下が著しい。本発明で
は、線引張力を１０ｇ以上としたため、長手方向に分子
が配向し、引張強度が向上し、長期信頼性が確保され
る。[Function] When the orientation of the polymer, which is a polymer, is small, the molecule has a random structure, so that the strength when it is pulled becomes weak. When the outer diameter of the fiber is 1000 μm or more, the strength does not decrease even if the orientation of the molecules is small.
When it is less than 000 μm, the strength is remarkably reduced. In the present invention, since the linear tensile force is 10 g or more, the molecules are oriented in the longitudinal direction, the tensile strength is improved, and long-term reliability is secured.
【０００９】[0009]
【実施例】以下、本発明について図面に示す実施例を参
照して詳細に説明する。本発明の一実施例を図１に示
す。図１はプラスチック光ファイバ線引装置を示すもの
である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. One embodiment of the present invention is shown in FIG. FIG. 1 shows a plastic optical fiber drawing device.
【００１０】同図に示すように、プラスチック光ファイ
バプリフォーム（以下、単にプリフォームと言う）３
は、加熱炉４内で加熱され、溶融されて所定の外径を有
するプラスチック光ファイバ５に紡糸された後、外径モ
ニター６で外径を測定され、巻取装置７に巻き取られ
る。As shown in the figure, a plastic optical fiber preform (hereinafter, simply referred to as a preform) 3
Is heated in a heating furnace 4, melted and spun into a plastic optical fiber 5 having a predetermined outer diameter, and then the outer diameter is measured by an outer diameter monitor 6 and wound by a winding device 7.
【００１１】プリフォーム３としては、コア及びクラッ
ドにおいてＧＩ型屈折率分布を有するものが用いられ
る。また、本実施例では、クラッドに光透過性に優れる
ポリメチルメタクリレート（ＰＭＭＡ）を用い、コアに
屈折率の高い化合物を用いて作製した。但し、コアに添
加する高屈折率化合物及びプリフォームの外径、長さは
特に限定されるものではない。As the preform 3, one having a GI type refractive index distribution in the core and the clad is used. In addition, in this example, the cladding was made of polymethylmethacrylate (PMMA) having excellent light transmittance, and the core was made of a compound having a high refractive index. However, the outer diameter and the length of the high refractive index compound and the preform added to the core are not particularly limited.
【００１２】高分子であるプリフォーム３は、加熱炉４
で加熱され巻取装置７により巻き取られるまで、１０ｇ
以上の線引張力が付与される。高分子は配向が小さいと
分子がランダム構造をとるために引っ張られた時の強度
が弱くなるが、本実施例のように紡糸の際に１０ｇ以上
の線引張力が付与されると、長手方向に分子が配向し、
引張強度が向上する。The polymer preform 3 is heated in a heating furnace 4
10 g until it is heated by and is wound up by the winding device 7.
The above linear tension is applied. When the orientation of the polymer is small, the strength of the polymer when pulled is weak because the molecule has a random structure, but when a linear tension of 10 g or more is applied during spinning as in this example, the longitudinal direction Molecules are oriented in
The tensile strength is improved.
【００１３】また、ファイバの外径が１０００μｍ以上
の場合は分子の配向が小さくても強度低下は見られない
が、１０００μｍ以下の場合には分子の配向が小さいと
強度の低下が著しいので、特に本発明のように線引張力
を付与し分子の配向を増大することが望ましい。Further, when the outer diameter of the fiber is 1000 μm or more, the strength is not reduced even if the orientation of the molecules is small, but when the diameter is 1000 μm or less, the strength is remarkably lowered when the orientation of the molecules is small. As in the present invention, it is desirable to apply a linear tension force to increase the orientation of molecules.
【００１４】次に、本発明の具体的実施例を比較例と比
べて説明する。 〔実施例１〕ＧＩ型の屈折率分布をつけたプラスチック
光ファイバプリフォームを用意して、炉芯管内温度２４
０℃に設定された線引炉にプリフォームを挿入し、外径
中心値を６５０μｍとして、線速２ｍ／ｍｉｎで線引を
行った。このときの線引張力は２０ｇであった。作製さ
れたファイバの引張強度を測定したところ、２．３Ｋｇ
／ｍｍ2であった。このファイバを直径１０ｍｍのマン
ドレルに巻き付けたことろ破断までの時間は１０日であ
った。Next, specific examples of the present invention will be described in comparison with comparative examples. [Example 1] A plastic optical fiber preform having a GI type refractive index distribution was prepared, and the temperature in the furnace core tube was set to 24.
The preform was inserted into the drawing furnace set at 0 ° C., and the center value of the outer diameter was set to 650 μm, and drawing was performed at a drawing speed of 2 m / min. The wire pulling force at this time was 20 g. When the tensile strength of the produced fiber was measured, it was 2.3 Kg.
/ Mm 2 . This fiber was wound on a mandrel having a diameter of 10 mm, and the time until breaking was 10 days.
【００１５】〔実施例２〕ＧＩ型の屈折率分布をつけた
プラスチック光ファイバプリフォームを用意して、炉芯
管内温度２３０℃に設定された線引炉にプリフォームを
挿入し、外径中心値を６５０μｍとして、線速２ｍ／ｍ
ｉｎで線引を行った。このときの線引張力は４０ｇであ
った。作製されたファイバの引張強度を測定したとこ
ろ、２．４Ｋｇ／ｍｍ2であった。このファイバを直径
１０ｍｍのマンドレルに巻き付けたことろ破断までの時
間は１２日であった。[Embodiment 2] A plastic optical fiber preform having a GI type refractive index distribution is prepared, and the preform is inserted into a drawing furnace set to a furnace core tube temperature of 230 ° C. The linear velocity is 2m / m when the value is 650μm.
The line was drawn in. The linear tension at this time was 40 g. When the tensile strength of the produced fiber was measured, it was 2.4 Kg / mm 2 . This fiber was wound on a mandrel having a diameter of 10 mm, and the time until breaking was 12 days.
【００１６】〔実施例３〕ＧＩ型の屈折率分布をつけた
プラスチック光ファイバプリフォームを用意して、炉芯
管内温度２５０℃に設定された線引炉にプリフォームを
挿入し、外径中心値を６５０μｍとして、線速２ｍ／ｍ
ｉｎで線引を行った。このときの線引張力は１５ｇであ
った。作製されたファイバの引張強度を測定したとこ
ろ、２．３Ｋｇ／ｍｍ2であった。このファイバを直径
１０ｍｍのマンドレルに巻き付けたことろ破断までの時
間は８日であった。[Embodiment 3] A plastic optical fiber preform having a GI type refractive index distribution was prepared, and the preform was inserted into a drawing furnace set to a furnace core tube temperature of 250 ° C. The linear velocity is 2m / m when the value is 650μm.
The line was drawn in. The wire pulling force at this time was 15 g. The tensile strength of the produced fiber was measured and found to be 2.3 Kg / mm 2 . This fiber was wound on a mandrel having a diameter of 10 mm, and the time until breaking was 8 days.
【００１７】〔比較例１〕ＧＩ型の屈折率分布をつけた
プラスチック光ファイバプリフォームを用意して、炉芯
管内温度２６０℃に設定された線引炉にプリフォームを
挿入し、外径中心値を６５０μｍとして、線速２ｍ／ｍ
ｉｎで線引を行った。このときの線引張力は８ｇであっ
た。作製されたファイバの引張強度を測定したところ、
１．５Ｋｇ／ｍｍ2であった。このファイバを直径１０
ｍｍのマンドレルに巻き付けたことろ破断までの時間は
１０時間であった。[Comparative Example 1] A plastic optical fiber preform having a GI type refractive index distribution was prepared, and the preform was inserted into a drawing furnace in which the temperature inside the furnace core tube was set to 260 ° C. The linear velocity is 2m / m when the value is 650μm.
The line was drawn in. The wire pulling force at this time was 8 g. When the tensile strength of the produced fiber was measured,
It was 1.5 Kg / mm 2 . This fiber has a diameter of 10
It took 10 hours to break the film by winding it around the mm mandrel.
【００１８】〔比較例２〕ＧＩ型の屈折率分布をつけた
プラスチック光ファイバプリフォームを用意して、炉芯
管内温度２６０℃に設定された線引炉にプリフォームを
挿入し、外径中心値を６５０μｍとして、線速１．５ｍ
／ｍｉｎで線引を行った。このときの線引張力は６ｇで
あった。作製されたファイバの引張強度を測定したとこ
ろ、１．３Ｋｇ／ｍｍ2であった。このファイバを直径
１０ｍｍのマンドレルに巻き付けたことろ破断までの時
間は８時間であった。[Comparative Example 2] A plastic optical fiber preform having a GI type refractive index distribution was prepared, and the preform was inserted into a drawing furnace in which the temperature inside the furnace core tube was set to 260 ° C. A linear velocity of 1.5 m with a value of 650 μm
The line was drawn at a speed of / min. The linear tension force at this time was 6 g. When the tensile strength of the produced fiber was measured, it was 1.3 Kg / mm 2 . This fiber was wound on a mandrel having a diameter of 10 mm, and the time until breakage was 8 hours.
【００１９】〔比較例３〕ＧＩ型の屈折率分布をつけた
プラスチック光ファイバプリフォームを用意して、炉芯
管内温度２７０℃に設定された線引炉にプリフォームを
挿入し、外径中心値を６５０μｍとして、線速２ｍ／ｍ
ｉｎで線引を行った。このときの線引張力は５ｇであっ
た。作製されたファイバの引張強度を測定したところ、
１．０Ｋｇ／ｍｍ2であった。このファイバを直径１０
ｍｍのマンドレルに巻き付けたことろ破断までの時間は
３時間であった。[Comparative Example 3] A plastic optical fiber preform having a GI type refractive index distribution was prepared, and the preform was inserted into a drawing furnace in which the temperature inside the furnace core tube was set to 270 ° C, and the center of the outer diameter was set. The linear velocity is 2m / m when the value is 650μm.
The line was drawn in. The wire pulling force at this time was 5 g. When the tensile strength of the produced fiber was measured,
It was 1.0 Kg / mm 2 . This fiber has a diameter of 10
It took 3 hours to break the film by winding it around the mm mandrel.
【００２０】〔比較例４〕ＧＩ型の屈折率分布をつけた
プラスチック光ファイバプリフォームを用意して、炉芯
管内温度２７５℃に設定された線引炉にプリフォームを
挿入し、外径中心値を１１００μｍとして、線速２ｍ／
ｍｉｎで線引を行った。このときの線引張力は５ｇであ
った。作製されたファイバの引張強度を測定したとこ
ろ、２．２Ｋｇ／ｍｍ2であった。このファイバを直径
１０ｍｍのマンドレルに巻き付けたことろ破断までの時
間は１０日であり、強度の低下はみられなかった。[Comparative Example 4] A plastic optical fiber preform having a GI type refractive index distribution was prepared, and the preform was inserted into a drawing furnace in which the temperature inside the furnace core tube was set to 275 ° C, and the center of the outer diameter was set. When the value is 1100 μm, the linear velocity is 2 m /
Drawing was performed at min. The wire pulling force at this time was 5 g. The tensile strength of the produced fiber was measured and found to be 2.2 Kg / mm 2 . By winding this fiber around a mandrel having a diameter of 10 mm, the time until breakage was 10 days, and no decrease in strength was observed.
【００２１】[0021]
【発明の効果】以上、実施例に基づいて具体的に説明し
たように、本発明はプラスチック光ファイバの線引方法
において、ファイバの外径が１０００μｍ以下である場
合、線引張力を１０ｇ以上としたため、機械的強度を向
上させ、長期信頼性を保証することができる。As described above in detail with reference to the embodiments, the present invention provides a method for drawing a plastic optical fiber in which the drawing force is 10 g or more when the outer diameter of the fiber is 1000 μm or less. Therefore, the mechanical strength can be improved and long-term reliability can be guaranteed.
【図１】本発明の一実施例に使用するプラスチック光フ
ァイバ線引装置の概略構成図である。FIG. 1 is a schematic configuration diagram of a plastic optical fiber drawing device used in an embodiment of the present invention.
【図２】ＳＩ型ファイバの屈折率分布図である。FIG. 2 is a refractive index profile of an SI type fiber.
【図３】ＧＩ型ファイバの屈折率分布図である。FIG. 3 is a refractive index distribution diagram of a GI type fiber.
１ クラッド ２ コア ３ プラスチック光ファイバプリフォーム ４ 加熱炉 ５ プラスチック光ファイバ ６ 外径モニター ７ 巻取装置 1 clad 2 core 3 plastic optical fiber preform 4 heating furnace 5 plastic optical fiber 6 outer diameter monitor 7 winding device
Claims (2)
がプラスチックで形成されてなるプリフォームを加熱
し、溶融させて所定の外径に紡糸するプラスチック光フ
ァイバの線引方法において、前記ファイバが巻き取られ
るまでの線引張力が１０ｇ以上であることを特徴とする
プラスチック光ファイバの線引方法。1. A method for drawing a plastic optical fiber, wherein a preform having a core and a clad having a predetermined refractive index formed of plastic is heated, melted, and spun to a predetermined outer diameter in a method for drawing a plastic optical fiber. A drawing method for a plastic optical fiber, characterized in that a drawing force until the wire is taken is 10 g or more.
紡糸する際の外径が１０００μｍ以下であることを特徴
とする請求項１記載のプラスチック光ファイバの線引方
法。2. The method for drawing a plastic optical fiber according to claim 1, wherein an outer diameter of the preform when heated, melted and spun is 1000 μm or less.
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6024137A JPH07234322A (en) | 1994-02-22 | 1994-02-22 | Method for drawing plastic optical fiber |
| PCT/JP1994/000962 WO1995000868A1 (en) | 1993-06-18 | 1994-06-14 | Production method and apparatus for plastic optical fiber base material |
| EP94917812A EP0664463A4 (en) | 1993-06-16 | 1994-06-14 | Plastic optical fiber base material, production method therefor, and apparatus therefor. |
| EP94917811A EP0662620A4 (en) | 1993-06-18 | 1994-06-14 | Production method and apparatus for plastic optical fiber base material. |
| PCT/JP1994/000963 WO1994029758A1 (en) | 1993-06-16 | 1994-06-14 | Plastic optical fiber base material, production method therefor, and apparatus therefor |
| US08/381,875 US5614253A (en) | 1993-06-16 | 1994-06-14 | Plastic optical fiber preform, and process and apparatus for producing the same |
| US08/381,874 US5639512A (en) | 1993-06-18 | 1994-06-14 | Plastic optical fiber preform, and process and apparatus for producing the same |
| US08/775,881 US5851666A (en) | 1993-06-16 | 1997-01-02 | Plastic optical fiber preform, and process and apparatus for producing the same |
| US08/837,103 US5891570A (en) | 1993-06-18 | 1997-04-14 | Plastic optical fiber preform having a jacket layer |
| US08/837,104 US5916495A (en) | 1993-06-18 | 1997-04-14 | Plastic optical fiber preform, and process and apparatus for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6024137A JPH07234322A (en) | 1994-02-22 | 1994-02-22 | Method for drawing plastic optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07234322A true JPH07234322A (en) | 1995-09-05 |
Family
ID=12129938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6024137A Pending JPH07234322A (en) | 1993-06-16 | 1994-02-22 | Method for drawing plastic optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07234322A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6042755A (en) * | 1997-09-11 | 2000-03-28 | Sumitomo Wiring Systems, Ltd. | Heating furnace for a device for drawing a plastic optical fiber |
| US7460756B2 (en) | 2004-03-31 | 2008-12-02 | Fujifilm Corporation | Plastic optical fiber and method for manufacturing the same |
| WO2014042023A1 (en) | 2012-09-11 | 2014-03-20 | 旭硝子株式会社 | Plastic optical fiber and method for producing same |
-
1994
- 1994-02-22 JP JP6024137A patent/JPH07234322A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6042755A (en) * | 1997-09-11 | 2000-03-28 | Sumitomo Wiring Systems, Ltd. | Heating furnace for a device for drawing a plastic optical fiber |
| US7460756B2 (en) | 2004-03-31 | 2008-12-02 | Fujifilm Corporation | Plastic optical fiber and method for manufacturing the same |
| WO2014042023A1 (en) | 2012-09-11 | 2014-03-20 | 旭硝子株式会社 | Plastic optical fiber and method for producing same |
| US9304251B2 (en) | 2012-09-11 | 2016-04-05 | Asahi Glass Company, Limited | Plastic optical fiber and method for its production |
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