JP2975034B2 - Manufacturing method of optical fiber core - Google Patents
Manufacturing method of optical fiber coreInfo
- Publication number
- JP2975034B2 JP2975034B2 JP2002569A JP256990A JP2975034B2 JP 2975034 B2 JP2975034 B2 JP 2975034B2 JP 2002569 A JP2002569 A JP 2002569A JP 256990 A JP256990 A JP 256990A JP 2975034 B2 JP2975034 B2 JP 2975034B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- resin
- coating
- fiber core
- reaction force
- 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.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、光ファイバ心線の製造方法に関するもので
ある。Description: TECHNICAL FIELD The present invention relates to a method for manufacturing an optical fiber core.
［従来の技術］ 従来、光ファイバ心線の製造は、第３図に示すように
石英ガラスからなる光ファイバ母材１を加熱炉２で約20
00℃に加熱して軟化させ、該光ファイバ母材１の加熱・
軟化部分から線引きをして通常125μｍφ程度の光ファ
イバ3Aを得、該光ファイバ3Aを直ちに被覆ダイス等の第
１段目の樹脂被覆器４に通してその表面に紫外線硬化樹
脂等の樹脂層を被覆することにより光ファイバ心線３を
得、次に該光ファイバ心線３を紫外線硬化炉等の第１段
目の樹脂硬化器５に通して樹脂層を硬化させ、次いで該
光ファイバ心線３を被覆ダイス等の第２段目の樹脂被覆
器６に通してその表面に更に紫外線硬化樹脂等の樹脂層
を被覆することにより樹脂層を２層設けた光ファイバ心
線３を得、次に該光ファイバ心線３を紫外線硬化炉等の
第２段目の樹脂硬化器７に通して樹脂層を硬化させ、キ
ャプスタン8,テンショリール９を経て巻取ドラム10に巻
取ることにより行っていた。[Prior Art] Conventionally, an optical fiber core wire is manufactured by heating an optical fiber preform 1 made of quartz glass in a heating furnace 2 for about 20 hours as shown in FIG.
Heat to 00 ° C. to soften and heat the optical fiber preform 1
An optical fiber 3A of usually about 125 μmφ is obtained by drawing from the softened portion. An optical fiber core 3 is obtained by coating, and the optical fiber core 3 is then passed through a first-stage resin curing device 5 such as an ultraviolet curing furnace to cure a resin layer. 3 is passed through a second-stage resin coating device 6 such as a coating die, and the surface thereof is further coated with a resin layer such as an ultraviolet curable resin to obtain an optical fiber core wire 3 having two resin layers. Then, the optical fiber core 3 is passed through a second-stage resin curing device 7 such as an ultraviolet curing furnace to cure the resin layer, and is wound on a winding drum 10 via a capstan 8 and a tension reel 9. I was
このような光ファイバ心線の製造方法における重要な
制御パラメータの１つに線引き張力がある。この線引き
張力は、光ファイバ母材１の軟化温度、加熱炉２の炉内
温度及び線引き速度に依存している。One of the important control parameters in the manufacturing method of such an optical fiber is a drawing tension. This drawing tension depends on the softening temperature of the optical fiber preform 1, the furnace temperature of the heating furnace 2, and the drawing speed.
［発明が解決しようとする課題］ 第３図に示すようにして光ファイバ心線３の製造を行
う場合、光ファイバ3Aは線引き張力Ｆ（樹脂の被覆を行
っていないとき）でキャプスタン８により引き取られて
おり、第１段目の樹脂被覆器４で樹脂を被覆するとき第
４図に示すように粘性をもった樹脂11より被覆反力Fcを
受け、このときFc＞Ｆのため光ファイバ3Aが被覆時の樹
脂11からの被覆反力Fcにより第４図に示すように微小に
曲げられるマイクロベンドを受け、その状態で樹脂層11
Aが被覆され、該樹脂層11Aが硬化されるので、マイクロ
ベンド損失の増加をひき起こす問題点があった。[Problems to be Solved by the Invention] When the optical fiber core 3 is manufactured as shown in FIG. 3, the optical fiber 3A is drawn by the capstan 8 with a drawing tension F (when resin coating is not performed). When the resin is coated by the first-stage resin coating device 4, the coating reaction force Fc is received from the viscous resin 11 as shown in FIG. 3A receives a microbend that is slightly bent as shown in FIG. 4 by a coating reaction force Fc from the resin 11 at the time of coating.
Since A is coated and the resin layer 11A is cured, there is a problem that the microbend loss is increased.
更に、このマイクロベンドを受けた光ファイバ心線３
が低温にさらされると、樹脂層11Aの収縮によりマイク
ロベンドが大きくなり、著しく損失が増加する問題点が
あった。Further, the optical fiber core wire 3 receiving this microbend
When is exposed to a low temperature, there is a problem that the microbend becomes large due to the contraction of the resin layer 11A and the loss increases remarkably.
本発明の目的は、マイクロベンドを起こさずに樹脂層
の被覆を行うことができる光ファイバ心線の製造方法を
提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing an optical fiber that can coat a resin layer without causing microbending.
［課題を解決するための手段］ 上記の目的を達成するための本発明の手段を説明する
と、本発明は光ファイバ母材の加熱・軟化部分から線引
きをして光ファイバを得、該光ファイバを樹脂被覆器に
通してその表面に樹脂層を被覆することにより光ファイ
バ心線を製造する光ファイバ心線の製造方法において、 前記光ファイバの線引き張力Ｆを前記樹脂被覆器にお
ける被覆反力Fcよりも大きくして線引きを行うことを特
徴とする。[Means for Solving the Problems] The means of the present invention for achieving the above object will be described. The present invention provides an optical fiber by drawing from a heated / softened portion of an optical fiber preform. Is passed through a resin coating device to cover the surface thereof with a resin layer, thereby manufacturing an optical fiber core wire. The drawing tension F of the optical fiber is changed to a coating reaction force Fc in the resin coating device. It is characterized in that drawing is performed with a larger size.
［作用］ このようにＦ＞Fcなる条件で線引きを行うと、樹脂層
の被覆時にマイクロベンドをひき起こさずに樹脂層の被
覆が行える。[Function] When the drawing is performed under the condition of F> Fc, the resin layer can be coated without causing microbending when the resin layer is coated.
［実施例］ 以下、本発明の実施例を図面を参照して詳細に説明す
る。Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
本実施例では、第３図に示すような工程で光ファイバ
心線３の製造を行う際に、第１図に示すように線引き張
力Ｆを樹脂被覆器４による被覆反力Fcよりも大きく、即
ちＦ＞Fcとして線引きを行う。In the present embodiment, when the optical fiber core 3 is manufactured in a process as shown in FIG. 3, the drawing tension F is larger than the coating reaction force Fc by the resin coating device 4 as shown in FIG. That is, drawing is performed with F> Fc.
このようにして線引きを行うと、第１段目の樹脂被覆
器４で光ファイバ3Aに樹脂層11Aを被覆するとき、樹脂1
1から被覆反力Fcを受けても、Ｆ＞Fcなので第１図に示
すようにマイクロベンドが生じなくなる。When the drawing is performed in this way, when the optical fiber 3A is coated with the resin layer 11A by the first-stage resin coating device 4, the resin 1
Even if the coating reaction force Fc is received from 1, since F> Fc, microbending does not occur as shown in FIG.
この場合、被覆反力Fcは樹脂11の粘度や線引き速度に
依存している。また、線引き張力Ｆは加熱炉２の炉内温
度や線引き速度等に依存している。In this case, the coating reaction force Fc depends on the viscosity of the resin 11 and the drawing speed. Further, the drawing tension F depends on the temperature in the furnace of the heating furnace 2, the drawing speed, and the like.
実施例 実験条件を表１に示す。Example Experimental conditions are shown in Table 1.
被覆構造を第２図に示す。樹脂層11Aは、ソフト，ハ
ードの２層構造であり、光ファイバ3Aの外径は125μm,
樹脂層11Aの外径は200μm,樹脂層12Aの外径は250μｍで
あった。樹脂11の粘度は、被覆時の樹脂温度を変化させ
て調節した。樹脂11としては、紫外線硬化型のウレタン
アクリレート樹脂でそのヤング率は第１段目では0.15kg
/mm2,2段目では70kg/mm2であった。線引き速度は200m/m
in、線引き張力は20gであった。 The coating structure is shown in FIG. The resin layer 11A has a two-layer structure of soft and hard, and the outer diameter of the optical fiber 3A is 125 μm,
The outer diameter of the resin layer 11A was 200 μm, and the outer diameter of the resin layer 12A was 250 μm. The viscosity of the resin 11 was adjusted by changing the resin temperature during coating. The resin 11 is a UV-curable urethane acrylate resin having a Young's modulus of 0.15 kg in the first stage.
/ mm 2 , and 70 kg / mm 2 in the second stage. Drawing speed is 200m / m
in, the drawing tension was 20 g.
被覆反力Fcは、次のようにして測定を行うことができ
る。まず、被覆を施さないときの線引き張力Ｆを測定す
る。次に、被覆を施した後に張力F.SUMを測定する。被
覆反力Fcは（F.SUM−Ｆ）より求める。これらの張力
は、３点式の張力計で測定した。The coating reaction force Fc can be measured as follows. First, the drawing tension F without coating is measured. Next, the tension F.SUM is measured after the coating is applied. The coating reaction force Fc is obtained from (F. SUM- F). These tensions were measured with a three-point tensiometer.
実験結果を表１に示す。被覆反力Fcが線引き張力Ｆを
越えると、波長1.55μｍでの損失、−30℃での損失増加
が著しく大きくなることがわかる。Table 1 shows the experimental results. It can be seen that when the coating reaction force Fc exceeds the drawing tension F, the loss at a wavelength of 1.55 μm and the loss at -30 ° C. increase significantly.
次に、線引き張力を変化させた実験を行った。被覆
径，樹脂，線引き速度は実験結果１と同様であった。被
覆反力Fcは43gであった。損失及び−30℃での損失増加
を表２に示す。この場合、線引き張力Ｆが被覆反力Fcよ
りも大きい場合、良好な伝送特性が得られた。Next, an experiment was performed in which the drawing tension was changed. The coating diameter, the resin, and the drawing speed were the same as in the experimental result 1. The coating reaction force Fc was 43 g. Table 2 shows the loss and the loss increase at -30 ° C. In this case, when the drawing tension F was larger than the coating reaction force Fc, good transmission characteristics were obtained.
上記の実験は、第１層目の樹脂被覆時における光ファ
イバと被覆反力との関係についてなされたものである
が、第２層目の樹脂被覆時における素線張力と被覆反力
との間にもこの関係があると考えられる。しかし、この
場合の素線張力は、線引き張力と１層目の被覆反力とが
加わり大きい値であるので、２層目の被覆反力は１層目
の被覆反力ほど強い影響を与えない。 The above experiment was conducted on the relationship between the optical fiber and the coating reaction force when the first layer of resin was coated. It is thought that this relationship also exists. However, the strand tension in this case is a large value due to the drawing tension and the coating reaction force of the first layer, so that the coating reaction force of the second layer does not have as strong an effect as the coating reaction force of the first layer. .
［発明の効果］ 以上説明したように本発明に係る光ファイバ心線の製
造方法では、光ファイバの線引き張力Ｆを樹脂被覆器に
おける被覆反力Fcより大きくして線引きを行うので、樹
脂の被覆時に光ファイバがマイクロベンドされるのを防
止でき、伝送損失及びその温度特性などの伝送特性の優
れた高品質の光ファイバ心線の製造を容易に行うことが
できる。[Effects of the Invention] As described above, in the method for manufacturing an optical fiber core wire according to the present invention, since the drawing is performed by setting the drawing tension F of the optical fiber to be larger than the coating reaction force Fc in the resin coating device, the resin coating Occasionally, microbending of the optical fiber can be prevented, and a high-quality optical fiber core having excellent transmission characteristics such as transmission loss and its temperature characteristics can be easily manufactured.
第１図は本発明の方法による光ファイバに対する樹脂被
覆工程の一例を示す縦断面図、第２図は本発明の方法で
製造された光ファイバ心線の一例を示す横断面図、第３
図は光ファイバ心線の製造装置における概略構成を示す
側面図、第４図は従来の方法による光ファイバに対する
樹脂被覆工程の例を示す縦断面図である。 １……光ファイバ母材、２……加熱炉、3A……光ファイ
バ、３……光ファイバ心線、4,6……樹脂被覆器、5,7…
…樹脂硬化器、８……キャプスタン、９……テンション
リール、10……巻取ドラム、11……樹脂、11A……樹脂
層。FIG. 1 is a longitudinal sectional view showing an example of a resin coating process for an optical fiber according to the method of the present invention, FIG.
FIG. 4 is a side view showing a schematic configuration of an optical fiber core manufacturing apparatus, and FIG. 4 is a longitudinal sectional view showing an example of a resin coating process on an optical fiber according to a conventional method. 1 ... optical fiber preform, 2 ... heating furnace, 3A ... optical fiber, 3 ... optical fiber core wire, 4, 6 ... resin coating device, 5, 7 ...
... Resin hardener, 8 ... Capstan, 9 ... Tension reel, 10 ... Winding drum, 11 ... Resin, 11A ... Resin layer.
フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) C03C 25/02 G02B 6/44 Continuation of front page (58) Field surveyed (Int.Cl. 6 , DB name) C03C 25/02 G02B 6/44
Claims (1)
きをして光ファイバを得、該光ファイバを樹脂被覆器に
通してその表面に樹脂層を被覆することにより光ファイ
バ心線を製造する光ファイバ心線の製造方法において、 前記光ファイバの線引き張力Ｆを前記樹脂被覆器におけ
る被覆反力Fcよりも大きくして線引きを行うことを特徴
とする光ファイバ心線の製造方法。An optical fiber is produced by drawing an optical fiber from a heated and softened portion of an optical fiber preform, passing the optical fiber through a resin coating device and coating the surface with a resin layer. A method for manufacturing an optical fiber core, comprising: drawing the optical fiber with a drawing tension F of the optical fiber greater than a coating reaction force Fc of the resin coating device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002569A JP2975034B2 (en) | 1990-01-11 | 1990-01-11 | Manufacturing method of optical fiber core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002569A JP2975034B2 (en) | 1990-01-11 | 1990-01-11 | Manufacturing method of optical fiber core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03208839A JPH03208839A (en) | 1991-09-12 |
| JP2975034B2 true JP2975034B2 (en) | 1999-11-10 |
Family
ID=11533004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002569A Expired - Fee Related JP2975034B2 (en) | 1990-01-11 | 1990-01-11 | Manufacturing method of optical fiber core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2975034B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW324788B (en) * | 1995-10-06 | 1998-01-11 | Sumitomo Electric Industries | Coating apparatuse for optical fiber |
-
1990
- 1990-01-11 JP JP2002569A patent/JP2975034B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03208839A (en) | 1991-09-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |