JPH0658452B2 - Optical fiber core - Google Patents
Optical fiber coreInfo
- Publication number
- JPH0658452B2 JPH0658452B2 JP60007257A JP725785A JPH0658452B2 JP H0658452 B2 JPH0658452 B2 JP H0658452B2 JP 60007257 A JP60007257 A JP 60007257A JP 725785 A JP725785 A JP 725785A JP H0658452 B2 JPH0658452 B2 JP H0658452B2
- Authority
- JP
- Japan
- Prior art keywords
- coating layer
- optical fiber
- secondary coating
- fiber core
- light
- 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
Landscapes
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Description
【発明の詳細な説明】 〔技術分野〕 本発明は、コアおよびクラッドとを有する１本または複
数本の光フアイバに光硬化性樹脂からなる一次被覆層お
よび二次被覆層を施してなる光フアイバ心線に関するも
のである。Description: TECHNICAL FIELD The present invention relates to an optical fiber comprising one or a plurality of optical fibers each having a core and a clad, and a primary coating layer and a secondary coating layer made of a photocurable resin. It is about the core wire.
従来より、第１図の如く、コア１と該コア１のまわりに
施してなるクラッド２とを有する光フアイバ３に、共に
光硬化性樹脂、具体的には紫外線硬化性樹脂からなる低
ヤング率で応力緩衝層となる一次被覆層４、取扱性等を
考慮して設ける高ヤング率の二次被覆層５を被覆せしめ
た光フアイバ心線６が知られている。Conventionally, as shown in FIG. 1, an optical fiber 3 having a core 1 and a clad 2 formed around the core 1 has a low Young's modulus made of a photocurable resin, specifically, an ultraviolet curable resin. There is known an optical fiber core wire 6 coated with a primary coating layer 4 serving as a stress buffer layer and a secondary coating layer 5 having a high Young's modulus provided in consideration of handleability and the like.
ところで、前記の如く、一次被覆層４および二次被覆層
５とが共に光硬化性樹脂からなる光フアイバ心線６を製
造する場合は、まず光フアイバ３に一次被覆層４用の光
硬化性樹脂を塗布し、これに紫外線等の光を照射して硬
化せしめた後、この一次被覆層４の上にさらに二次被覆
層５用の光硬化性樹脂を塗布し、これに光を照射して硬
化せしめる。ここで、前記一次被覆層４に使用される低
ヤング率の光硬化性樹脂を硬化させる光の強さをＩ1、
二次被覆層５に用いられる高ヤング率の光硬化性樹脂を
硬化させる光の強さをＩ2とすると、一般的には低ヤン
グ率のものの方が光の強さを必要とするためＩ1＞Ｉ2で
ある。従って、前述のような光フアイバ心線６の生産性
は、前記一次被覆層４の硬化速度に制限されてしまい、
前記従来方法で製造する限り生産性の向上はもはや望め
ない状態にきている。By the way, as described above, when manufacturing the optical fiber core wire 6 in which both the primary coating layer 4 and the secondary coating layer 5 are made of a photocurable resin, first, the optical fiber 3 is subjected to the photocurable resin for the primary coating layer 4. After applying a resin and irradiating it with light such as ultraviolet rays to cure it, a photocurable resin for the secondary coating layer 5 is further applied onto this primary coating layer 4, and this is irradiated with light. To cure. Here, the intensity of light for curing the low Young's modulus photocurable resin used for the primary coating layer 4 is I 1 ,
Assuming that the light intensity for curing the high Young's modulus photocurable resin used for the secondary coating layer 5 is I 2 , in general, the one having a low Young's modulus requires light intensity I 2. 1 > I 2 . Therefore, the productivity of the optical fiber core wire 6 as described above is limited by the curing speed of the primary coating layer 4,
As long as it is manufactured by the conventional method, improvement in productivity is no longer expected.
前記問題に鑑み本発明の目的は、一次被覆層および二次
被覆層が共に光硬化性樹脂からなる光フアイバ心線にあ
って、生産性の向上を図れる光フアイバ心線を提供する
ことにある。In view of the above problems, it is an object of the present invention to provide an optical fiber core wire in which both the primary coating layer and the secondary coating layer are made of a photocurable resin, and the productivity can be improved. .
前記目的を達成すべく本発明のものは、光フアイバのま
わりに施されてなる光硬化性樹脂からなる一次被覆層
と、該一次被覆層のまわりに施されてなる光硬化性樹脂
からなる二次被覆層とを有する光フアイバ心線におい
て、前記二次被覆層を構成する光硬化性樹脂の光吸収係
数εが、透過距離Ｘ1、Ｘ2における光の強度を各々Ｉ
(X1)、Ｉ(X2)としたとき の値が3.0(1/mm)以下であることを特徴とするものであ
る。In order to achieve the above object, the present invention comprises a primary coating layer made of a photocurable resin applied around the optical fiber and a photocurable resin provided around the primary coating layer. In the optical fiber core having the secondary coating layer, the light absorption coefficient ε of the photo-curable resin forming the secondary coating layer has the light intensities I at the transmission distances X 1 and X 2 , respectively.
(X1) , I (X2) Is less than 3.0 (1 / mm).
以下に本発明の実施例を詳細に説明する。本発明の特徴
は、前記第１図における二次被覆層５を光の透過性のよ
い光硬化性樹脂で構成することにある。すなわち、一次
被覆層４上に塗布された二次被覆層５用の光硬化性樹脂
に光、例えば紫外線を照射してこれを硬化せしめる際
に、前記二次被覆層５用の光硬化性樹脂に照射した紫外
線の一部を前記二次被覆層５中を透過させ、これを一次
被覆層４の硬化にも寄与させるようにせしめたものであ
る。Examples of the present invention will be described in detail below. A feature of the present invention is that the secondary coating layer 5 in FIG. 1 is composed of a photocurable resin having a good light transmission property. That is, when the photocurable resin for the secondary coating layer 5 applied on the primary coating layer 4 is irradiated with light, for example, ultraviolet rays to cure it, the photocurable resin for the secondary coating layer 5 is cured. A part of the ultraviolet rays radiated onto the secondary coating layer 5 is transmitted through the secondary coating layer 5 to contribute to the curing of the primary coating layer 4.
このような考えに基づいて二次被覆層５用の光硬化性樹
脂を種々検討した結果、二次被覆層５を構成する光硬化
性樹脂の光吸収係数εが、透過距離Ｘ1、Ｘ2における光
の強度を各々Ｉ(X1)、Ｉ(X2)としたとき の値が3.0(1/mm)以下であると効果的であることを見出
した。As a result of various studies on the photo-curable resin for the secondary coating layer 5 based on such an idea, the light absorption coefficient ε of the photo-curable resin forming the secondary coating layer 5 is determined by the transmission distances X 1 and X 2. Let I (X1) and I (X2) be the light intensities at It has been found that the value of is 3.0 (1 / mm) or less is effective.
以下に具体例を示す。尚、一次被覆層４用および二次被
覆層５用に使用した光硬化性樹脂は、共にウレタンアク
リレート系樹脂であり、その常温でのヤング率は前者が
１kgf/mm2以下、後者が15kgf/mm2以上である。また、光
吸収係数εは硬化前の光吸収係数を表し、ここでいう光
吸収係数とは、波長領域320〜390nmでの光の強度の平均
値より求めたものである。A specific example is shown below. The photocurable resins used for the primary coating layer 4 and the secondary coating layer 5 were both urethane acrylate resins, and the Young's modulus at room temperature was 1 kgf / mm 2 or less for the former and 15 kgf / mm 2 for the latter. mm 2 or more. The light absorption coefficient ε represents the light absorption coefficient before curing, and the light absorption coefficient here is obtained from the average value of the light intensity in the wavelength region of 320 to 390 nm.
すなわち、透過距離Ｘ1、Ｘ2における波長λの光の強度
をそれぞれＩX1(λ)、ＩX2(λ)とし、これ波長領域をλ
＝320〜390nmでの平均値を、 とし、 としたときの、 の値を意味する。また、光硬化性樹脂が飽和ゲル分率に
達するということは、光硬化性樹脂が完全に硬化した状
態をいう。それ故、光硬化性樹脂が飽和ゲル分率を得る
のに要する最高線速とは、これ以上線速を上げると完全
に硬化しないという限界線速をさす。That is, the intensities of light of wavelength λ at transmission distances X 1 and X 2 are I X1 (λ) and I X2 (λ) , respectively, and the wavelength region is λ.
= Average value from 320 to 390 nm, age, And when Means the value of. The fact that the photocurable resin reaches the saturated gel fraction means that the photocurable resin is completely cured. Therefore, the maximum linear velocity required for the photo-curable resin to obtain the saturated gel fraction means the limit linear velocity at which the resin is not completely cured when the linear velocity is further increased.
尚、上記表における光フアイバ心線６の各寸法は、光フ
アイバ３の外径が0.125mm、一次被覆層４の外径が0.3m
m、二次被覆層５の外径が0.9mmである。 The dimensions of the optical fiber core wire 6 in the above table are such that the outer diameter of the optical fiber 3 is 0.125 mm and the outer diameter of the primary coating layer 4 is 0.3 m.
m, the outer diameter of the secondary coating layer 5 is 0.9 mm.
上記表が示すように、本発明の如く二次被覆層５として
光吸収係数εの値が3.0以下の光硬化性樹脂、すなわ
ち、光が透過し易い光硬化性樹脂を使用すると、二次被
覆層５を硬化するために照射された紫外線等の光の一部
が、前記二次被覆層５を透過して内側の一次被覆層４の
硬化にも寄与するようになる。その結果、前表が示すよ
うに光フアイバ心線６の製造線速向上が図れる。尚、本
実施例においては、光フアイバ３としてコア１およびク
ラッド２からなるものについて述べているが、光フアイ
バ３としては前記クラッド２上に熱硬化性あるいは熱可
塑性樹脂が予備被覆された光フアイバ３も含まれる。す
なわち、本発明は、外周部に共に光硬化性樹脂からなる
二層構造の被覆層を有する光フアイバ心線６には常に応
用できるものである。さらには、光フアイバ３を複数本
撚り合わせ、これに光硬化性樹脂からなる一次被覆層
４、二次被覆層５を被覆せしめたもの、複数本の光フア
イバ３を平面状に並行に並べ、これに光硬化性樹脂から
なる一次被覆層４、二次被覆層５を被覆せしめたもの、
というような多心型光フアイバ心線６にも適用できるこ
とはいうまでもない。As shown in the above table, if a photo-curable resin having a light absorption coefficient ε of 3.0 or less, that is, a photo-curable resin that easily transmits light, is used as the secondary coating layer 5 according to the present invention, the secondary coating is obtained. A part of the light such as ultraviolet rays irradiated to cure the layer 5 is transmitted through the secondary coating layer 5 and also contributes to the curing of the inner primary coating layer 4. As a result, as shown in the above table, the manufacturing linear velocity of the optical fiber core wire 6 can be improved. In this embodiment, the optical fiber 3 is composed of the core 1 and the clad 2. However, the optical fiber 3 is an optical fiber in which the clad 2 is precoated with a thermosetting or thermoplastic resin. 3 is also included. That is, the present invention can always be applied to the optical fiber core wire 6 having the coating layer of the two-layer structure made of the photocurable resin on the outer peripheral portion. Furthermore, a plurality of optical fibers 3 are twisted together, and a primary coating layer 4 and a secondary coating layer 5 made of a photo-curable resin are coated on this, a plurality of optical fibers 3 are arranged in parallel in a plane, This is coated with a primary coating layer 4 and a secondary coating layer 5 made of a photocurable resin,
It goes without saying that it can be applied to the multi-fiber type optical fiber core 6 as described above.
前記の如く本発明によれば、二次被覆層として光の透過
性のよい光硬化性樹脂を使用しているため、前記二次被
覆層を透過した光の一部が内側の一次被覆層の硬化にも
寄与することになり、その結果、従来問題となっていた
内側の一次被覆層の硬化が効率的かつ迅速に行われ、も
って光フアイバ心線の製造線速の向上が図れる。As described above, according to the present invention, since the photo-curable resin having good light transmissivity is used as the secondary coating layer, a part of the light transmitted through the secondary coating layer is the inner primary coating layer. This also contributes to curing, and as a result, the inner primary coating layer, which has been a problem in the past, can be efficiently and promptly cured, thereby improving the manufacturing linear velocity of the optical fiber core wire.
第１図は本発明に係わる光フアイバ心線の一実施例を示
す横断面図である。 ３……光フアイバ、４……一次被覆層、５……二次被覆
層、６……光フアイバ心線FIG. 1 is a cross-sectional view showing an embodiment of the optical fiber core wire according to the present invention. 3 ... Optical fiber, 4 ... Primary coating layer, 5 ... Secondary coating layer, 6 ... Optical fiber core wire
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭54−154338（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-54-154338 (JP, A)
Claims (1)
性樹脂からなる一次被覆層と、該一次被覆層のまわりに
施されている光硬化性樹脂からなる二次被覆層とを有す
る光フアイバ心線において、前記二次被覆層を構成する
光硬化性樹脂の光吸収係数εが、透過距離Ｘ1、Ｘ2にお
ける光の強度を各々Ｉ(X1)、Ｉ(X2)としたとき の値が3.0(1/mm)以下であることを特徴とする光フアイ
バ心線。1. A light having a primary coating layer made of a photocurable resin applied around an optical fiber, and a secondary coating layer made of a photocurable resin applied around the primary coating layer. In the fiber core, when the light absorption coefficient ε of the photo-curable resin that constitutes the secondary coating layer is the light intensities at the transmission distances X 1 and X 2 , respectively, I (X1) and I (X2) The optical fiber core wire having a value of 3.0 (1 / mm) or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60007257A JPH0658452B2 (en) | 1985-01-18 | 1985-01-18 | Optical fiber core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60007257A JPH0658452B2 (en) | 1985-01-18 | 1985-01-18 | Optical fiber core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61166505A JPS61166505A (en) | 1986-07-28 |
| JPH0658452B2 true JPH0658452B2 (en) | 1994-08-03 |
Family
ID=11660972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60007257A Expired - Fee Related JPH0658452B2 (en) | 1985-01-18 | 1985-01-18 | Optical fiber core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0658452B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2131078C (en) * | 1993-09-30 | 2002-04-16 | William James Baron | Method of curing dual-coated optical fiber |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54154338A (en) * | 1978-05-25 | 1979-12-05 | Nippon Telegr & Teleph Corp <Ntt> | Glass fiber for optical transmission and production |
-
1985
- 1985-01-18 JP JP60007257A patent/JPH0658452B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61166505A (en) | 1986-07-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |