JPH079497B2 - Optical fiber core - Google Patents
Optical fiber coreInfo
- Publication number
- JPH079497B2 JPH079497B2 JP60012029A JP1202985A JPH079497B2 JP H079497 B2 JPH079497 B2 JP H079497B2 JP 60012029 A JP60012029 A JP 60012029A JP 1202985 A JP1202985 A JP 1202985A JP H079497 B2 JPH079497 B2 JP H079497B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- fiber core
- curable resin
- coating
- coating layer
- 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 - Lifetime
Links
Landscapes
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
Description
【発明の詳細な説明】 〔技術分野〕 本発明は光フアイバに複数の被覆層を施してなる光フア
イバ心線の改良に関するものである。Description: TECHNICAL FIELD The present invention relates to an improvement in an optical fiber core wire formed by applying a plurality of coating layers to an optical fiber.
従来より、例えば、第３図の如く、コアと該コアのまわ
りに施されてなるクラッドとを有する光フアイバ１のま
わりに内側から順に内側被覆層２、一次被覆層３そして
最外層被覆４というように複数の被覆層を施した光フア
イバ心線５が知られている。Conventionally, for example, as shown in FIG. 3, an optical fiber 1 having a core and a clad formed around the core is referred to as an inner coating layer 2, a primary coating layer 3, and an outermost layer coating 4 in order from the inside. As described above, an optical fiber core wire 5 having a plurality of coating layers is known.
さて、前記構造の光フアイバ心線５の代表的なものとし
ては、前記内側被覆層２を高屈折率の熱硬化性シリコー
ン樹脂で、同じく前記一次被覆層３を低屈折率の熱硬化
性シリコーン樹脂で、最外層被覆４をナイロン−12に代
表される熱可塑性樹脂で構成したものとか、前記内側被
覆層２を比較的柔らかい、例えばそのヤング率が0.05〜
0.5kg/mm2程度の紫外線硬化性樹脂で構成し緩衝効果を
持たせると共に、該内側被覆層２のまわりにさらに取扱
性を考慮してそのヤング率が１〜50kg/mm2程度というよ
うに比較的硬い紫外線硬化性樹脂からなる一次被覆層３
を施し、最後に前者の場合同様にナイロン‐12等の熱可
塑性樹脂の最外層被覆４として被覆せしめたものがあ
る。As a typical example of the optical fiber core wire 5 having the above structure, the inner coating layer 2 is made of a thermosetting silicone resin having a high refractive index, and the primary coating layer 3 is made of a thermosetting silicone having a low refractive index. The outermost layer coating 4 is made of a resin such as a thermoplastic resin typified by nylon-12, or the inner coating layer 2 is relatively soft, for example, its Young's modulus is 0.05 to
Together to have a configuration and buffering effect in the 0.5 kg / mm 2 approximately of the ultraviolet curable resin, the Young's modulus in view of the further handling properties around the inner coating layer 2 is such that 1 to 50 kg / mm 2 approximately Primary coating layer 3 made of relatively hard UV curable resin
Finally, in the same manner as in the former case, the outermost layer coating 4 of a thermoplastic resin such as nylon-12 is applied.
しかしながら、前記２種類の光フアイバ心線５の場合以
下のようの問題がある。まず前者のものにあっては、熱
硬化性樹脂の硬化速度に限界があり、製造線速を200〜3
00m/minしか上げられない。また、熱硬化性シリコーン
樹脂とナイロンの組み合わせの場合、水素が発生し易
く、そのため該水素により光フアイバ１が特定周波数領
域で伝送損失増加を起こす。一方後者にあっては、前者
における問題は解決できるものの、紫外線硬化性樹脂か
らなる一次被覆層３のまわり最外層被覆４を押出被覆す
る際に、該押出被覆時の熱により、前記一次被覆層３が
吸湿性の比較的大きい紫外線硬化性樹脂よりなるため、
吸湿していた水分が蒸発し、その結果光フアイバ心線５
の外観が悪くなるとか、さらにこの熱で一次被覆層３に
熱劣化や硬化不均一等が発生し、結果的には光フアイバ
１の伝送損失が増加するという現象も現れる。また、一
般的に多くの紫外線硬化性樹脂の常として、低温でその
ヤング率が急増してしまい、その際内側の光フアイバ１
に大きな収縮力が作用し、伝送損失の増加を引き起こす
という問題もある。However, the two types of optical fiber core wires 5 have the following problems. First of all, in the former case, there is a limit to the curing speed of the thermosetting resin, and the production linear speed is 200 to 3
Only 00m / min can be raised. Further, in the case of the combination of the thermosetting silicone resin and nylon, hydrogen is easily generated, so that the hydrogen causes the optical fiber 1 to increase the transmission loss in the specific frequency region. On the other hand, in the latter, although the former problem can be solved, when the outermost layer coating 4 is extrusion-coated around the primary coating layer 3 made of an ultraviolet curable resin, the primary coating layer is heated by the heat during the extrusion coating. Since 3 is made of a UV curable resin having a relatively large hygroscopic property,
The absorbed moisture evaporates, and as a result, the optical fiber cord 5
In addition, there is a phenomenon in which the heat is deteriorated or the curing is nonuniform in the primary coating layer 3 due to this heat, and as a result, the transmission loss of the optical fiber 1 is increased. In addition, as is the case with many UV-curable resins, the Young's modulus of the resin rapidly increases at low temperatures.
There is also a problem that a large contraction force acts on the wire and causes an increase in transmission loss.
前記問題に鑑み本発明の目的は、最外層被覆に内接する
前記一次被覆層が紫外線硬化性樹脂からなる光フアイバ
心線において、光フアイバ心線の外観が良好で、最外層
被覆を被覆後および低温時においても伝送損失の増加の
少ない光フアイバ心線を提供することにある。In view of the above problems, the object of the present invention is to provide an optical fiber core wire in which the primary coating layer inscribed in the outermost layer coating is made of an ultraviolet curable resin, the appearance of the optical fiber core wire is good, and after coating the outermost layer coating and An object of the present invention is to provide an optical fiber core wire whose transmission loss is small even at low temperatures.
前記目的を達成すべく本発明のものは、コアおよびクラ
ッドを有する光フアイバのまわりに複数の被覆層を施し
てなる光フアイバ心線において、前記複数の被覆層のう
ち最外層被覆に内接する一次被覆層はウレタンアクリレ
ート変成シリコーンオリゴマーを主成分とする紫外線硬
化性樹脂からなることを特徴とするものである。In order to achieve the above object, the present invention is an optical fiber core wire formed by applying a plurality of coating layers around an optical fiber having a core and a clad, and a primary fiber which is inscribed in the outermost layer of the plurality of coating layers. The coating layer is characterized by being made of an ultraviolet curable resin containing a urethane acrylate modified silicone oligomer as a main component.
本発明は前記目的を達成するため、前記一次被覆層３の
材料としては、低吸湿性、低吸水性で、耐熱性に優れ、
低温でのヤング率増加が少ないものでなければならな
い、という観点から種々の材料について実験調査を行っ
た。その結果、ウレタンアクリレート変成シリコーンオ
リゴマーを主成分とする紫外線硬化性樹脂を前記一次被
覆層３として用いると効果的であることを見出した。こ
れを実施例に基づいて詳細に説明する。第１図は本発明
の光フアイバ心線５の一実施例を示している。本図に従
って説明すると、本発明のものは、コアおよびクラッド
を有する光フアイバ１のまわりにまずヤング率がおよそ
0.1〜0.5kg/mm2程度の紫外線硬化性樹脂からなる内側被
覆層２を施し、該内側被覆層２のまわりにウレタンアク
リレート変成シリコーンオリゴマーを主成分とする紫外
線硬化性樹脂からなる一次被覆層３を設け、さらに該一
次被覆層３の外側に最外層被覆４として熱可塑性樹脂で
あるナイロン−12を押出被覆したものである。実施例
（表では実という）と比較例（表では比という）を下表
に示す。In order to achieve the above object, the present invention uses, as a material for the primary coating layer 3, low hygroscopicity, low water absorption, and excellent heat resistance,
Experimental investigations were conducted on various materials from the viewpoint that the Young's modulus increase at low temperatures should be small. As a result, they have found that it is effective to use an ultraviolet curable resin containing a urethane acrylate-modified silicone oligomer as a main component as the primary coating layer 3. This will be described in detail based on examples. FIG. 1 shows an embodiment of the optical fiber core wire 5 of the present invention. Explaining in accordance with this figure, in the present invention, the Young's modulus is first around the optical fiber 1 having a core and a clad.
An inner coating layer 2 made of a UV-curable resin of about 0.1 to 0.5 kg / mm 2 is applied, and a primary coating layer 3 made of a UV-curable resin containing a urethane acrylate-modified silicone oligomer as a main component is provided around the inner coating layer 2. The outermost layer coating 4 is extrusion-coated with nylon-12, which is a thermoplastic resin, on the outside of the primary coating layer 3. Examples (referred to in the table) and comparative examples (referred to as ratio in the table) are shown in the table below.
尚上記表ではＡはウレタン系紫外線硬化性樹脂、Ｂ、Ｂ
は各々ウレタンアクリレート変成シリコーンオリゴマー
を主成分とする紫外線硬化性樹脂、Ｃはウレタンアクリ
レート変成シリコーンオリゴマーを含有しない紫外線硬
化性樹脂、具体的には紫外線硬化性のエポキシアクリレ
ート樹脂、Ｄはウレタンアクリレート変成シリコーンオ
リゴマーの代わりにメルカプタン含有両末端不飽和基封
鎖のポリシロキサンを主成分とする紫外線硬化性樹脂で
ある。また、表で使用した光フアイバ心線５の各寸法
は、光フアイバ１の外径が125μｍ、内側被覆層２の外
径が250μｍ、一次被覆層３の外径が400μｍ、最外層被
覆４の外径は900μｍである。また、伝送損失の単位はd
B/kmである。さらにヤング率の測定方法としては、3.5J
/cm2の紫外線を照射し硬化させた厚さ200〜250μｍのシ
ートよりダンベル形シートを打ち抜きJISK7113に従い試
験した。ダンベルは２号を使用する。またチャック間隔
は25mmとし、歪はチャートより読み取り計算する。引張
速度は1mm/minとした。 In the above table, A is urethane type UV curable resin, B and B
Is a UV-curable resin containing a urethane acrylate-modified silicone oligomer as a main component, C is a UV-curable resin containing no urethane acrylate-modified silicone oligomer, specifically, a UV-curable epoxy acrylate resin, and D is a urethane acrylate-modified silicone. It is an ultraviolet curable resin whose main component is a polysiloxane having mercaptan-containing unsaturated groups at both ends instead of an oligomer. The dimensions of the optical fiber core wire 5 used in the table are as follows: the outer diameter of the optical fiber 1 is 125 μm, the outer diameter of the inner coating layer 2 is 250 μm, the outer diameter of the primary coating layer 3 is 400 μm, and the outermost layer coating 4 is The outer diameter is 900 μm. The unit of transmission loss is d
B / km. Furthermore, the method of measuring Young's modulus is 3.5J
A dumbbell-shaped sheet was punched out from a sheet having a thickness of 200 to 250 μm which was cured by irradiating it with ultraviolet rays of / cm 2 and tested in accordance with JIS K7113. Use dumbbell No. 2. The chuck interval is 25 mm, and the strain is read from the chart for calculation. The pulling speed was 1 mm / min.
上記表が示すように、最外層被覆４に内接する一次被覆
層３をウレタンアクリレート変成シリコーンオリゴマー
を主成分とする紫外線硬化性樹脂で構成すると、ナイロ
ン−12からなる最外層被覆４を押出被覆しても該最外層
被覆４の内側の一次被覆層３が低吸湿、低吸水性のウレ
タンアクリレート変成シリコーンオリゴマーを主成分と
する紫外線硬化性樹脂であるため光フアイバ心線５の外
観が悪くなるということもなく、また押出被覆後の伝送
損失の増加も見られなかった。加えて、−40℃において
も光フアイバ１の伝送損失はなんら増加していなかっ
た。これに対して、例えば、メルカプタン含有両末端不
飽和基封鎖のポリシロキサンを主成分とする紫外線硬化
性樹脂では、最外層被覆４との密着性が強いため、最外
層被覆４が低温下で熱収縮するとその影響が光フアイバ
１へと伝わり、伝送損失増加が著しくなるものと推定さ
れる。また、表には示していないが、常温（約23℃前
後）でのヤング率が2kg/mm2をこえるウレタンアクリレ
ート変成シリコーンオリゴマーを主成分とする紫外線硬
化性樹脂では、ウレタンアクリレート変成シリコーンオ
リゴマーと架橋モノマーとの相容性が悪く、材料が均一
にならないため、実際に光フアイバに被覆したところ、
特性のばらつきが大きく実用に供することができなかっ
た。As shown in the above table, when the primary coating layer 3 inscribed in the outermost layer coating 4 is composed of a UV curable resin containing urethane acrylate modified silicone oligomer as a main component, the outermost layer coating 4 made of nylon-12 is extrusion coated. However, since the primary coating layer 3 on the inner side of the outermost layer coating 4 is an ultraviolet curable resin containing a urethane acrylate-modified silicone oligomer having a low moisture absorption and a low water absorption as a main component, the appearance of the optical fiber core wire 5 is deteriorated. In addition, no increase in transmission loss was observed after extrusion coating. In addition, the transmission loss of the optical fiber 1 did not increase even at -40 ° C. On the other hand, for example, in the case of an ultraviolet curable resin containing a mercaptan-containing polysiloxane having both ends unsaturated groups blocked as a main component, the outermost layer coating 4 has strong adhesion to the outermost layer coating 4, so that the outermost layer coating 4 is heated at a low temperature. It is presumed that the contraction propagates to the optical fiber 1 when it contracts, and the transmission loss increases remarkably. Although not shown in the table, UV curable resin mainly composed of urethane acrylate-modified silicone oligomer whose Young's modulus exceeds 2 kg / mm 2 at room temperature (around 23 ° C) is a urethane acrylate-modified silicone oligomer. Since the compatibility with the cross-linking monomer is poor and the material is not uniform, when actually coated on the optical fiber,
The characteristics were so large that it could not be put to practical use.
また、第２図は本発明の他の実施例で、これは内側被覆
層２が複数の被覆層2A、2Bからなるもので、例えば、2A
を熱硬化性樹脂、2Bを紫外線硬化性樹脂で構成してもよ
い。いずれにせよ一次被覆層３の内側の内側被覆層２は
一層でも複数層でもよく、またそれらの層が熱硬化性樹
脂、紫外線硬化性樹脂のいずれから構成されていても本
発明は適用できる。FIG. 2 shows another embodiment of the present invention in which the inner coating layer 2 is composed of a plurality of coating layers 2A and 2B.
May be composed of a thermosetting resin, and 2B may be composed of an ultraviolet curable resin. In any case, the inner coating layer 2 on the inner side of the primary coating layer 3 may be a single layer or a plurality of layers, and the present invention can be applied regardless of whether these layers are composed of a thermosetting resin or an ultraviolet curable resin.
前述の如く、本発明の光フアイバ心線は、熱可塑性樹脂
からなる最外層被覆に内接する一次被覆層をウレタンア
クリレート変成シリコーンオリゴマーを主成分とする紫
外線硬化性樹脂により構成したことにより、該ウレタン
アクリレート変成シリコーンオリゴマーを主成分とする
紫外線硬化性樹脂が低吸湿、低吸水性かつ低温でのヤン
グ率の増加が少ないことから、光フアイバ心線の最外層
被覆の外観が良好で、該最外層被覆後の伝送損失増加も
少なく、しかも低温下においても伝送損失増加が少ない
という優れた硬化を有している。As described above, the optical fiber core wire of the present invention has the primary coating layer inscribed in the outermost layer coating made of a thermoplastic resin, which is formed by an ultraviolet curable resin containing a urethane acrylate modified silicone oligomer as a main component. The UV curable resin containing an acrylate-modified silicone oligomer as a main component has low moisture absorption, low water absorption, and a small increase in Young's modulus at low temperature, and thus the outer appearance of the outermost layer of the optical fiber core wire is good and the outermost layer has a good appearance. It has an excellent hardening that the transmission loss after coating is small and the transmission loss is small even at low temperature.
第１図、第２図は本発明の光フアイバ心線の一実施例お
よび他の実施例を示す横断面図、第３図は従来の光フア
イバ心線を示す横断面図である。 １……光フアイバ、２……内側被覆層、３……一次被覆
層、４……最外層被覆、５……光フアイバ心線1 and 2 are cross-sectional views showing one embodiment and another embodiment of the optical fiber core wire of the present invention, and FIG. 3 is a cross-sectional view showing a conventional optical fiber core wire. 1 ... Optical fiber, 2 ... Inner coating layer, 3 ... Primary coating layer, 4 ... Outermost layer coating, 5 ... Optical fiber core wire
Claims (2)
まわりに複数の被覆層を施してなる光フアイバ心線にお
いて、前記複数の被覆層のうち最外層被覆に内接する一
次被覆層はウレタンアクリレート変成シリコーンオリゴ
マーを主成分とする紫外線硬化性樹脂からなることを特
徴とする光フアイバ心線。1. In an optical fiber core wire formed by applying a plurality of coating layers around an optical fiber having a core and a clad, a primary coating layer inscribed in an outermost coating of the plurality of coating layers is a urethane acrylate modified silicone. An optical fiber core wire comprising an ultraviolet curable resin containing an oligomer as a main component.
オリゴマーを主成分とする紫外線硬化性樹脂の常温での
ヤング率Ｅは0.4≦Ｅ≦2.0（kg/mm2）であることを特徴
とする特許請求の範囲第１項記載の光フアイバ心線。2. The Young's modulus E of the ultraviolet curable resin containing the urethane acrylate modified silicone oligomer as a main component at room temperature is 0.4 ≦ E ≦ 2.0 (kg / mm 2 ). The optical fiber core wire according to item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60012029A JPH079497B2 (en) | 1985-01-25 | 1985-01-25 | Optical fiber core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60012029A JPH079497B2 (en) | 1985-01-25 | 1985-01-25 | Optical fiber core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61170711A JPS61170711A (en) | 1986-08-01 |
| JPH079497B2 true JPH079497B2 (en) | 1995-02-01 |
Family
ID=11794173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60012029A Expired - Lifetime JPH079497B2 (en) | 1985-01-25 | 1985-01-25 | Optical fiber core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH079497B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63168608A (en) * | 1987-01-06 | 1988-07-12 | Fujikura Ltd | Core wire of optical fiber |
| TW536640B (en) * | 2001-04-13 | 2003-06-11 | Furukawa Electric Co Ltd | Coated optical fiber |
| JP2007247715A (en) * | 2006-03-14 | 2007-09-27 | Nitto Electric Works Ltd | Fastening structure by screw |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59111950A (en) * | 1982-12-14 | 1984-06-28 | Nitto Electric Ind Co Ltd | Coating material for optical fiber glass |
-
1985
- 1985-01-25 JP JP60012029A patent/JPH079497B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61170711A (en) | 1986-08-01 |
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