JPH0554083B2 - - Google Patents
Info
- Publication number
- JPH0554083B2 JPH0554083B2 JP60065886A JP6588685A JPH0554083B2 JP H0554083 B2 JPH0554083 B2 JP H0554083B2 JP 60065886 A JP60065886 A JP 60065886A JP 6588685 A JP6588685 A JP 6588685A JP H0554083 B2 JPH0554083 B2 JP H0554083B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- layer
- curable resin
- tape
- ultraviolet curable
- 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
- 239000013307 optical fiber Substances 0.000 claims description 37
- 239000010410 layer Substances 0.000 claims description 19
- 239000011347 resin Substances 0.000 claims description 19
- 229920005989 resin Polymers 0.000 claims description 19
- 239000011241 protective layer Substances 0.000 claims description 17
- 239000011247 coating layer Substances 0.000 claims description 14
- 230000003139 buffering effect Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 description 8
- 239000004014 plasticizer Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
Landscapes
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Description
〔技術分野〕
本発明は、光フアイバ素線を複数本平面状に並
行に並べて、これに一体的に保護層を設けてなる
テープ型光フアイバユニツトに関するものであ
る。
〔従来技術〕
従来より、第１図に示すようなテープ型光フア
イバユニツトが知られている。これは、光フアイ
バ１にシリコーンからなる被覆層２を設けた複数
本の光フアイバ素線３を平面状に並行に並べ、こ
れにナイロンからなる保護層４を一体的に被覆し
たものである。ところが、被覆層２がシリコーン
からなり、保護層４がナイロンからなる従来のテ
ープ型光フアイバユニツトにおいては、この材料
の組み合わせが原因で時間の経過と共に水素が発
生し、これが光フアイバ１内で水酸基に変化し、
光フアイバ１の伝送特性を劣化させることがわか
つてきた。加えて、前記材料は硬化させるのに時
間がかかり、製造線速が上がらない。それ故、こ
のユニツトの価格を下げることができない。この
ような問題に対して、これまで種々の材料検討が
なされ、その結果、最近になつて、被覆層２およ
び保護層４を共に紫外線硬化性樹脂で構成するこ
とが提案された。このように紫外線硬化性樹脂で
被覆層２、保護層４を構成するテープ型光フアイ
バユニツトでは、水素は発生しにくく、それ故、
経時的に光フアイバ１の伝送特性が劣化すること
もほとんどない。加えて、紫外線硬化性樹脂の硬
化速度が速いので、製造コストの低減が図れ、も
つて、価格の安いものができるというメリツトも
ある。ところが、このように被覆層２および保護
層４を共に紫外線硬化性樹脂で構成したものは、
低温下で樹脂が収縮したり、外力を受けたりする
と、従来のものよりマイクロベンドが発生し易い
ということがわかつてきた。すなわち、温度特性
と側圧特性に欠陥がある。それ故、現在のとこ
ろ、実用に供する状態には至つていない。
〔発明の目的〕
前記問題に鑑み、本発明の目的は、温度特性、
側圧特性を含む長期信頼性に優れ、かつ、価格の
安いテープ型光フアイバユニツトを提供すること
にある。
〔発明の構成〕
前記目的を達成すべく、本発明のテープ型光フ
アイバユニツトは、紫外線硬化性樹脂からなる被
覆層を有する光フアイバ素線を複数本平面状に並
行に並べた光フアイバ集合体と、該光フアイバ集
合体を一体的に被覆する紫外線硬化性樹脂からな
る保護層とを有するテープ型光フアイバユニツト
において、前記光フアイバ素線の被覆層はゲル分
率が40〜70％であり、−30℃〜70℃におけるヤン
グ率が2.0Kg／mm2以下の応力緩衝層を少なくとも
一層は有し、かつ、前記保護層は硬化度が85％以
上であることを特徴とするものである。
〔発明の実施例〕
以下に本発明の実施例を詳細に説明する。第１
図を引用して説明すると、本発明のテープ型光フ
アイバユニツトは、光フアイバ１のまわりに紫外
線硬化性樹脂からなり、そのゲル分率が40〜70％
で、かつ、−30℃〜70℃におけるヤング率が2.0
Kg／mm2以下の応力緩衝層を少なくとも一層は有す
る被覆層２を設け、光フアイバ素線３を形成す
る。しかる後、該光フアイバ素線３を複数本平面
状に並行に並べ、これに紫外線硬化性樹脂からな
り、その硬化度が85％以上の保護層４を前記複数
の光フアイバ素線３に一体的に設ける。尚、前記
被覆層２は、一層もしくはそれ以上の層からなる
が、すべて紫外線硬化性樹脂からなるものとす
る。そして、この被覆層２にあつて、前記応力緩
衝層は、どの位置にあつてもよいが、少なくとも
一層はこの応力緩衝層で占められることが必要で
ある。ここで、ゲル分率とは何かを第２図で説明
する。いま、第２図の斜線部をＡとし、これを硬
化に寄与しない材料の量、すなわち、可塑材の量
とし、空白部をＢとし、これを硬化に寄与する材
料の量、すなわち、紫外線硬化性樹脂そのものの
量とする。この時ゲル分率は、ゲル分率＝〔硬化
した量／（Ａ＋Ｂ）〕×100（％）と定義される。し
かし、実際には、Ｂ、すなわち、紫外線硬化性樹
脂の量の大部分は硬化するから、ゲル分率≒
〔Ｂ／（Ａ＋Ｂ）〕×100（％）と近似できる。また、
硬化度は空白部Ｂの内、実際に硬化した量をＢで
除したもので、硬化度＝（硬化した量／Ｂ）×100
（％）で表すことができる。つまり、ゲル分率と
は材料全体に占める紫外線硬化性樹脂そのものの
量のおおよその割合を示し、一方、硬化度とは紫
外線硬化性樹脂そのものの内何％が硬化したかを
示すものである。それ故、ゲル分率が40〜70％と
いうことは、可塑材が約30〜60％入つていること
を示している。
このようにしてなる本発明のテープ型光フアイ
バユニツトにおいては、被覆層２の内少なくとも
その一層を構成する応力緩衝層の紫外線硬化性樹
脂に可塑材をおおよそ30〜60％混入させることに
より、紫外線硬化性樹脂を軟らかくし、低温から
高温にかけて特性を安定化させる。尚、可塑材を
おおよそ30〜60％混入させる理由は、可塑材が60
％以上になると、耐熱性が劣化すると共に、紫外
線を照射したときの硬化速度が遅くなり、製造速
度を上げることができなくなるためで、一方、可
塑材の量がおおよそ30％以下になると、従来同様
に応力緩衝層のヤング率が温度に依存し易くな
り、特に、低温でマイクロベンドを起こしやすく
なるためである。さらに、この応力緩衝層のヤン
グ率を−30℃〜70℃において、2.0Kg／mm2以下に
するのは、当然のことながら、少なくともこの温
度範囲において、該応力緩衝層に本来の役割であ
る応力緩衝効果を果たさせ、側圧特性を向上させ
るためである。ここで、−30℃〜70℃という温度
範囲は、本発明のテープ型光フアイバユニツトが
布設された場合置かれると予想される一般的な温
度条件である。また、保護層４に求められる要求
は、光フアイバ素線３の保護と同時に、このテー
プ型光フアイバユニツトを接続する時の作業性を
含めた取扱い性向上にある。そこで、この保護層
４の硬化度を85％以上にすることにより、該保護
層４の表面の粘着性を押さえ、つまり、作業時に
手にべたつくことのない程度に粘着性を押さえ、
取扱い性を向上させる。
以下に本発明の実施例を示す。
内層および外層の二層からなる被覆層２を有す
る外径0.3mmの光フアイバ素線３を、第１図のご
とく５本平面状に並行に並べ、これに一体的に保
護層４を被覆し、厚さ0.4mm、幅1.6mmになるよう
形成したテープ型光フアイバユニツトにおいて、
以下のごとく被覆層２の内層、外層および保護層
４の材料を種々変えてその特性を評価した。
[Technical Field] The present invention relates to a tape-type optical fiber unit in which a plurality of optical fibers are arranged in parallel in a plane and a protective layer is integrally provided thereon. [Prior Art] Conventionally, a tape-type optical fiber unit as shown in FIG. 1 has been known. This is an optical fiber 1 having a coating layer 2 made of silicone, a plurality of optical fibers 3 arranged in parallel in a plane, and integrally coated with a protective layer 4 made of nylon. However, in the conventional tape-type optical fiber unit in which the coating layer 2 is made of silicone and the protective layer 4 is made of nylon, hydrogen is generated over time due to this combination of materials, which causes hydroxyl groups within the optical fiber 1. changed to
It has been found that the transmission characteristics of the optical fiber 1 are degraded. In addition, the materials take a long time to cure and do not increase manufacturing line speeds. Therefore, the price of this unit cannot be reduced. To address these problems, various materials have been studied, and as a result, it has recently been proposed that both the covering layer 2 and the protective layer 4 be made of ultraviolet curable resin. In the tape-type optical fiber unit in which the coating layer 2 and the protective layer 4 are made of ultraviolet curable resin, hydrogen is difficult to generate.
The transmission characteristics of the optical fiber 1 hardly deteriorate over time. In addition, since the ultraviolet curable resin has a fast curing speed, it has the advantage of reducing manufacturing costs and producing products at low prices. However, in the case where both the coating layer 2 and the protective layer 4 are made of ultraviolet curable resin,
It has been found that when resin contracts at low temperatures or is subjected to external force, microbends are more likely to occur than in conventional resins. That is, the temperature characteristics and lateral pressure characteristics are defective. Therefore, it has not yet reached a state where it can be put to practical use. [Object of the Invention] In view of the above problems, the object of the present invention is to improve temperature characteristics,
The object of the present invention is to provide a tape-type optical fiber unit that has excellent long-term reliability including lateral pressure characteristics and is inexpensive. [Structure of the Invention] In order to achieve the above object, the tape-type optical fiber unit of the present invention is an optical fiber assembly in which a plurality of optical fiber wires each having a coating layer made of an ultraviolet curable resin are arranged in parallel in a plane. and a protective layer made of an ultraviolet curable resin that integrally covers the optical fiber assembly, wherein the coating layer of the optical fiber wire has a gel fraction of 40 to 70%. , it has at least one stress buffering layer with a Young's modulus of 2.0 Kg/mm 2 or less at -30°C to 70°C, and the protective layer has a degree of hardening of 85% or more. . [Embodiments of the Invention] Examples of the present invention will be described in detail below. 1st
To explain with reference to the figure, the tape-type optical fiber unit of the present invention is made of an ultraviolet curable resin around the optical fiber 1, and the gel fraction thereof is 40 to 70%.
And the Young's modulus between -30℃ and 70℃ is 2.0
A coating layer 2 having at least one stress buffering layer of Kg/mm 2 or less is provided to form an optical fiber 3. After that, a plurality of the optical fiber strands 3 are arranged in parallel in a plane, and a protective layer 4 made of an ultraviolet curable resin and having a degree of curing of 85% or more is integrated with the plurality of optical fiber strands 3. to be established. Incidentally, the coating layer 2 consists of one or more layers, all of which are made of ultraviolet curable resin. In this coating layer 2, the stress buffering layer may be located at any position, but it is necessary that at least one layer is occupied by this stress buffering layer. Here, what is gel fraction will be explained with reference to FIG. Now, the shaded area in Figure 2 is A, which is the amount of material that does not contribute to curing, that is, the amount of plasticizer, and the blank area is B, which is the amount of material that contributes to curing, that is, the amount of ultraviolet curing. This is the amount of the resin itself. At this time, the gel fraction is defined as gel fraction=[hardened amount/(A+B)]×100(%). However, in reality, most of the amount of B, that is, the ultraviolet curable resin, is cured, so the gel fraction ≒
It can be approximated as [B/(A+B)]×100(%). Also,
The degree of hardening is the amount of blank area B that is actually hardened divided by B, and the degree of hardening = (hardened amount/B) x 100
It can be expressed as (%). In other words, the gel fraction indicates the approximate proportion of the amount of the ultraviolet curable resin itself in the entire material, while the degree of curing indicates what percentage of the ultraviolet curable resin itself has been cured. Therefore, a gel fraction of 40 to 70% indicates that approximately 30 to 60% of plasticizer is contained. In the tape-type optical fiber unit of the present invention constructed in this manner, approximately 30 to 60% of the plasticizer is mixed into the ultraviolet curable resin of the stress buffer layer constituting at least one layer of the coating layer 2. It softens curable resin and stabilizes its properties from low to high temperatures. In addition, the reason why approximately 30 to 60% plasticizer is mixed is that the plasticizer is 60%
If the amount of plasticizer exceeds 30%, the heat resistance will deteriorate and the curing speed when irradiated with ultraviolet rays will slow down, making it impossible to increase the production speed. Similarly, the Young's modulus of the stress buffer layer tends to depend on temperature, and microbending is particularly likely to occur at low temperatures. Furthermore, keeping the Young's modulus of this stress buffering layer below 2.0Kg/mm 2 at -30°C to 70°C is, of course, the original role of the stress buffering layer, at least in this temperature range. This is to achieve a stress buffering effect and improve lateral pressure characteristics. Here, the temperature range of -30 DEG C. to 70 DEG C. is the general temperature condition expected to be applied when the tape-type optical fiber unit of the present invention is installed. Further, the protective layer 4 is required to protect the optical fiber wire 3 and at the same time to improve the handling efficiency including the workability when connecting this tape type optical fiber unit. Therefore, by setting the degree of curing of the protective layer 4 to 85% or more, the adhesiveness of the surface of the protective layer 4 is suppressed, that is, the adhesiveness is suppressed to the extent that it does not become sticky to the hands during work.
Improves handling. Examples of the present invention are shown below. Five optical fibers 3 having an outer diameter of 0.3 mm and having a coating layer 2 consisting of two layers, an inner layer and an outer layer, are arranged in parallel in a plane as shown in Fig. 1, and are integrally coated with a protective layer 4. In a tape-type optical fiber unit formed to have a thickness of 0.4 mm and a width of 1.6 mm,
The properties of the inner and outer layers of the coating layer 2 and the protective layer 4 were evaluated by changing the materials as described below.
前述の如く、本発明のテープ型光フアイバユニ
ツトは、側圧特性、温度特性を含めた長期信頼性
に優れ、加えて、取扱い性にも優れ、しかも、製
造コストが安いという優れた効果を有する。
As mentioned above, the tape-type optical fiber unit of the present invention has excellent long-term reliability including lateral pressure characteristics and temperature characteristics, and also has excellent handling properties and low manufacturing costs.
第１図はテープ型光フアイバユニツトの横断面
図、第２図はゲル分率及び硬化度を説明するため
の説明図、第３図は内層材のヤング率と伝送損失
の関係を示すグラフである。
１……光フアイバ、２……被覆層、３……光フ
アイバ素線３、４……保護層。
Figure 1 is a cross-sectional view of a tape-type optical fiber unit, Figure 2 is an explanatory diagram to explain the gel fraction and degree of curing, and Figure 3 is a graph showing the relationship between Young's modulus of the inner layer material and transmission loss. be. DESCRIPTION OF SYMBOLS 1... Optical fiber, 2... Covering layer, 3... Optical fiber wire 3, 4... Protective layer.
Claims (1)
フアイバ素線を複数本平面状に並行に並べた光フ
アイバ集合体と、該光フアイバ集合体を一体的に
被覆する紫外線硬化性樹脂からなる保護層とを有
するテープ型光フアイバユニツトにおいて、前記
光フアイバ素線の被覆層はゲル分率が40〜70％で
あり−30℃〜70℃におけるヤング率が2.0Kg／mm2
以下の応力緩衝層を少なくとも一層は有し、か
つ、前記保護層は硬化度が85％以上であることを
特徴とするテープ型光フアイバユニツト。1. An optical fiber assembly in which a plurality of optical fiber wires each having a coating layer made of an ultraviolet curable resin are arranged in parallel in a plane, and a protective layer made of an ultraviolet curable resin that integrally covers the optical fiber assembly. In the tape type optical fiber unit, the coating layer of the optical fiber wire has a gel fraction of 40 to 70% and a Young's modulus of 2.0 Kg/mm 2 at -30°C to 70°C.
1. A tape-type optical fiber unit comprising at least one stress buffering layer as described below, and wherein the protective layer has a degree of curing of 85% or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60065886A JPS61246709A (en) | 1985-03-29 | 1985-03-29 | Tape type optical fiber unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60065886A JPS61246709A (en) | 1985-03-29 | 1985-03-29 | Tape type optical fiber unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61246709A JPS61246709A (en) | 1986-11-04 |
| JPH0554083B2 true JPH0554083B2 (en) | 1993-08-11 |
Family
ID=13299902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60065886A Granted JPS61246709A (en) | 1985-03-29 | 1985-03-29 | Tape type optical fiber unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61246709A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0749447Y2 (en) * | 1987-05-21 | 1995-11-13 | 昭和電線電纜株式会社 | Optical fiber tape core |
| JPS6423010U (en) * | 1987-07-29 | 1989-02-07 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS599608A (en) * | 1982-07-08 | 1984-01-19 | Furukawa Electric Co Ltd:The | Tape-like optical fiber core |
| JPS5915907A (en) * | 1982-07-19 | 1984-01-27 | Nippon Telegr & Teleph Corp <Ntt> | Production of plural-cored optical fiber bundle |
| JPS59213647A (en) * | 1983-05-14 | 1984-12-03 | Furukawa Electric Co Ltd:The | Preparation of cable core of optical fiber |
| JPS6026913A (en) * | 1983-07-26 | 1985-02-09 | Yokohama Rubber Co Ltd:The | Optical fiber core and its production |
| JPS6173111A (en) * | 1984-09-18 | 1986-04-15 | Furukawa Electric Co Ltd:The | Tape-shaped optical fiber unit |
-
1985
- 1985-03-29 JP JP60065886A patent/JPS61246709A/en active Granted
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS599608A (en) * | 1982-07-08 | 1984-01-19 | Furukawa Electric Co Ltd:The | Tape-like optical fiber core |
| JPS5915907A (en) * | 1982-07-19 | 1984-01-27 | Nippon Telegr & Teleph Corp <Ntt> | Production of plural-cored optical fiber bundle |
| JPS59213647A (en) * | 1983-05-14 | 1984-12-03 | Furukawa Electric Co Ltd:The | Preparation of cable core of optical fiber |
| JPS6026913A (en) * | 1983-07-26 | 1985-02-09 | Yokohama Rubber Co Ltd:The | Optical fiber core and its production |
| JPS6173111A (en) * | 1984-09-18 | 1986-04-15 | Furukawa Electric Co Ltd:The | Tape-shaped optical fiber unit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61246709A (en) | 1986-11-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS58123504A (en) | Optical cable element | |
| JP2585823B2 (en) | Optical fiber unit | |
| JPH0554083B2 (en) | ||
| JPH0458004B2 (en) | ||
| JPH0776118B2 (en) | Manufacturing method of coated optical fiber | |
| JPH02118608A (en) | Coated optical fiber tape | |
| JP2848766B2 (en) | Optical composite ground wire | |
| JPS6310806B2 (en) | ||
| JPH1164692A (en) | Light conductor and ribbon structure light conductor | |
| JPH079497B2 (en) | Optical fiber core | |
| JP3022710B2 (en) | Thin optical fiber unit for optical composite ground wire and method of manufacturing the same | |
| CN209702640U (en) | A kind of hot melt adhesive film with low-shrinkage and the flexible cable using it | |
| JPH01155306A (en) | Fiber of optical fiber tape | |
| JPS6247008A (en) | Optical fiber unit | |
| JPS62129805A (en) | Product coated with composite body and its production | |
| JPH0410564Y2 (en) | ||
| JP2003029107A (en) | Optical tape-fiber core | |
| JPH0343603B2 (en) | ||
| CN104950380B (en) | A kind of optical fiber | |
| JPS63170607A (en) | Core of tape optical fiber cable | |
| JPS6319611A (en) | Optical fiber tape core | |
| JPS5811908A (en) | Nonmetallic optical cable unit | |
| JP2000329949A (en) | Flexible optical fiber sheet | |
| JPH0531604Y2 (en) | ||
| JPS59155804A (en) | Optical fiber having metallic coated layer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |