JPH046003Y2 - - Google Patents
Info
- Publication number
- JPH046003Y2 JPH046003Y2 JP1984075392U JP7539284U JPH046003Y2 JP H046003 Y2 JPH046003 Y2 JP H046003Y2 JP 1984075392 U JP1984075392 U JP 1984075392U JP 7539284 U JP7539284 U JP 7539284U JP H046003 Y2 JPH046003 Y2 JP H046003Y2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- thermosetting resin
- whiskers
- coating layer
- large number
- 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
Links
- 239000013307 optical fiber Substances 0.000 claims description 54
- 230000003014 reinforcing effect Effects 0.000 claims description 33
- 239000010410 layer Substances 0.000 claims description 29
- 229920005989 resin Polymers 0.000 claims description 24
- 239000011347 resin Substances 0.000 claims description 24
- 229920001187 thermosetting polymer Polymers 0.000 claims description 22
- 239000011247 coating layer Substances 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 13
- 229920005992 thermoplastic resin Polymers 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 description 6
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 229920001410 Microfiber Polymers 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000003658 microfiber Substances 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 229930040373 Paraformaldehyde Natural products 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical group [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- -1 polyoxymethylene Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
Landscapes
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
Description
【考案の詳細な説明】
技術分野
本考案は強化被覆光フアイバに関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to reinforced coated optical fibers.
従来技術
光フアイバは、例えば光通信伝送路として利用
する場合伝送損失の小さいことが要求される上、
過酷な条件で使用されることが多いことから優れ
た機械的特性が必要とされる。このため従来では
例えば第２図に示すように、コア及びクラツドよ
り成る部分の外周面に緩衝層を形成して成る光フ
アイバ１を用い、この光フアイバ１の外周面に、
光フアイバ１の長さ方向に沿つて各々伸びる長尺
状の繊維２例えばガラス繊維に含浸硬化された熱
硬化性樹脂３より成る強化被覆層（二次被覆）４
を設けることによつて強化被覆光フアイバが構成
されている。ここで、強化被覆層４を光フアイバ
１の外周面に設けるには、ガラス繊維に含浸され
た熱硬化性樹脂３を加熱しながら光フアイバ１と
ともにダイスの中を通すことによつて、この強化
被覆層４は光フアイバ１に縦添えされる。Prior Art Optical fibers are required to have low transmission loss when used, for example, as optical communication transmission lines.
Excellent mechanical properties are required because they are often used under harsh conditions. For this reason, conventionally, for example, as shown in FIG. 2, an optical fiber 1 is used in which a buffer layer is formed on the outer circumferential surface of a portion consisting of a core and a cladding.
Elongated fibers 2 each extending along the length of the optical fiber 1 A reinforcing coating layer (secondary coating) 4 made of a thermosetting resin 3 impregnated into, for example, glass fibers and cured.
A reinforced coated optical fiber is constructed by providing the above. Here, in order to provide the reinforcing coating layer 4 on the outer circumferential surface of the optical fiber 1, the thermosetting resin 3 impregnated into the glass fiber is passed through a die together with the optical fiber 1 while heating. The coating layer 4 is applied longitudinally to the optical fiber 1.
考案が解決しようとする課題
しかしながら、このような従来の強化被覆光フ
アイバにあつては、熱硬化性樹脂３を加熱硬化さ
せながら光フアイバ１に縦添えさせた後には、こ
の熱硬化性樹脂３は常温に冷却されるので収縮す
る。そうすると、光フアイバ１には熱硬化性樹脂
３によつてこの長さ方向に不均一な側圧がかかつ
てしまう。また、強化被覆層４と光フアイバ１と
の線膨脹係数に差があることからも、光フアイバ
１にはこの長さ方向に不均一な側圧がかかつてし
まう。このため、光フアイバ１には大きなストレ
スが生じてしまい、ひいては伝送特性の低下を招
く虞が生じるという問題があつた。Problems to be Solved by the Invention However, in the case of such a conventional reinforced coated optical fiber, after the thermosetting resin 3 is attached longitudinally to the optical fiber 1 while being heated and cured, the thermosetting resin 3 shrinks as it is cooled to room temperature. In this case, non-uniform lateral pressure is applied to the optical fiber 1 in the length direction due to the thermosetting resin 3. Further, since there is a difference in linear expansion coefficient between the reinforcing coating layer 4 and the optical fiber 1, uneven lateral pressure is applied to the optical fiber 1 in the length direction. For this reason, a problem arises in that a large stress is generated in the optical fiber 1, which may eventually lead to deterioration of transmission characteristics.
本考案は、光フアイバに大きなストレスを生じ
させず、伝送特性を向上させた強化被覆フアイバ
を提供するこを目的とする。 An object of the present invention is to provide a reinforced coated fiber that does not cause large stress on the optical fiber and has improved transmission characteristics.
課題を解決するための手段
このような目的を達成するために、本考案にあ
つては、外周部が緩衝層により形成された光フア
イバと、前記緩衝層の外周を覆うように形成され
た強化被覆層とを有して成り、前記強化被覆層
は、光フアイバの長さ方向に沿つて各々伸びる多
数の長尺状の繊維に含浸硬化された熱硬化性樹脂
と、この熱硬化樹脂の中に含有された多数のウイ
スカーとより成り、前記緩衝層と強化被覆層との
間に、前記光フアイバの長さ方向に配向させた多
数のウイスカーを含有した熱可塑性樹脂より成る
中間補強層を設けた構成としたものである。Means for Solving the Problems In order to achieve such an object, the present invention includes an optical fiber whose outer periphery is formed by a buffer layer, and a reinforced optical fiber formed to cover the outer periphery of the buffer layer. The reinforcing coating layer comprises a thermosetting resin impregnated and cured into a large number of elongated fibers each extending along the length of the optical fiber, and a thermosetting resin in the thermosetting resin. An intermediate reinforcing layer made of a thermoplastic resin containing a large number of whiskers oriented in the longitudinal direction of the optical fiber is provided between the buffer layer and the reinforcing coating layer. The structure is as follows.
作 用
光フアイバの外周側には中間補強層が被覆され
ているので、前記熱硬化性樹脂の収縮変形による
光フアイバにかかる不均一な側圧力はかなり緩和
され、この光フアイバに生じるストレスを小さく
することができる。また、中間補強層を構成する
熱可塑性樹脂の中に多数のウイスカーを含有さ
せ、さらにこのウイスカーを光フアイバの長さ方
向に配向するようにしているため、中間補強層の
線膨張係数が小さくなつて中間補強層及び光フア
イバのガラスの線膨張係数が互に近づくから、温
度変化による光フアイバのストレスを小さくする
ことができる。Function Since the outer peripheral side of the optical fiber is coated with the intermediate reinforcing layer, the uneven side pressure applied to the optical fiber due to shrinkage and deformation of the thermosetting resin is considerably alleviated, and the stress generated on the optical fiber is reduced. can do. In addition, because the thermoplastic resin constituting the intermediate reinforcing layer contains a large number of whiskers, and these whiskers are oriented in the length direction of the optical fiber, the linear expansion coefficient of the intermediate reinforcing layer is reduced. Since the linear expansion coefficients of the intermediate reinforcing layer and the glass of the optical fiber become close to each other, stress on the optical fiber due to temperature changes can be reduced.
実施例
以下、本考案を図面に基づいて説明する。第１
図は本考案に係る強化被覆光フアイバの一実施例
を示す図である。Embodiments The present invention will be explained below based on the drawings. 1st
The figure shows an embodiment of a reinforced coated optical fiber according to the present invention.
第１図において、符号１は光フアイバであり、
コアおよびクラツドより成る部分の外周面にはプ
ラスチツク製の緩衝層が形成され、光フアイバ１
の外周側には中間補強層８が被覆されている。こ
の中間補強層８は熱可塑性樹脂３の中に多数のウ
イスカー５を練り込んでおき、これを押し出し機
により押し出して管状に成形したものである。次
に練り込まれたウイスカー５を前記管状の長さ方
向に配向するには、この管状のものを約10倍程度
に引き延ばせばよく（いわゆる引き落とし）、熱
可塑性樹脂３に練り込まれた多数のウイスカー５
は長さ方向にきれいに配向される。この管状のも
のの中に光フアイバ１を挿通することによつて、
この光フアイバ１の外周側には中間補強層８が被
覆されることになる。 In FIG. 1, reference numeral 1 represents an optical fiber;
A plastic buffer layer is formed on the outer peripheral surface of the portion consisting of the core and cladding, and the optical fiber 1 is
An intermediate reinforcing layer 8 is coated on the outer circumferential side of. This intermediate reinforcing layer 8 is made by kneading a large number of whiskers 5 into a thermoplastic resin 3 and extruding the mixture using an extruder to form a tubular shape. Next, in order to orient the kneaded whiskers 5 in the length direction of the tubular shape, it is sufficient to stretch the tubular shape by about 10 times (so-called drawing), and the whiskers 5 kneaded into the thermoplastic resin 3 are Whisker 5
are neatly oriented in the length direction. By inserting the optical fiber 1 into this tubular object,
The outer peripheral side of the optical fiber 1 is coated with an intermediate reinforcing layer 8.
ここでウイスカーとは単結晶の微小繊維であ
り、チタン酸カリウム、炭化珪素、窒化珪素、ポ
リオキシメチレン等より成る。ウイスカーを用い
るにあたつては、１種例えばチタン酸カリウムよ
り成るウイスカーのみを使用してもよいし、或い
は２種以上を組み合わせて例えばチタン酸カリウ
ムのウイスカー及び炭化珪素のウイスカーを組み
合わせて使用してもよいが、線膨張係数が、光フ
アイバを構成するガラスのそれに近いもの例えば
チタン酸カリウムや窒化珪素等の無機物より成る
ウイスカーを用いることがより好ましい。ウイス
カーの一例として６チタン酸カリウム（K2Ｏ・
6TiO2）の白色針状結晶をあげると、これは平均
繊維長10〜20μm、繊維径0.2〜0.5μmという微細
なものであり、しかも樹脂との相溶性も極めてよ
いものである。中間補強層８の外周面に、光フア
イバ１の長さ方向に沿つて伸びる多数の長尺状の
繊維２例えばガラス繊維に含浸硬化された熱硬化
性樹脂３とこの熱硬化性樹脂３に含有された多数
のウイスカー５とより成る強化被覆層６を設け
る。すなわち、熱硬化性樹脂３が含浸させられた
長尺状の繊維２と、中間補強層８に被覆された光
フアイバ１とを供にダイスの中に加熱しながら通
すことにより、熱硬化性樹脂３および長尺状の繊
維２は強化被覆層６となつて光フアイバ１に中間
補強層８を介して縦添えされる。 The whiskers herein are single-crystal microfibers made of potassium titanate, silicon carbide, silicon nitride, polyoxymethylene, or the like. When using whiskers, one type, for example, a whisker made of potassium titanate may be used alone, or two or more types may be used in combination, such as a whisker of potassium titanate and a whisker of silicon carbide. However, it is more preferable to use a whisker made of an inorganic material such as potassium titanate or silicon nitride, whose coefficient of linear expansion is close to that of the glass constituting the optical fiber. An example of a whisker is potassium hexatitanate (K 2 O.
The white needle-like crystals of 6TiO 2 ) are fine with an average fiber length of 10 to 20 μm and a fiber diameter of 0.2 to 0.5 μm, and are also extremely compatible with resins. On the outer peripheral surface of the intermediate reinforcing layer 8, a large number of elongated fibers 2 extending along the length direction of the optical fiber 1, for example, a thermosetting resin 3 impregnated into glass fiber and hardened, and a thermosetting resin 3 contained in the thermosetting resin 3 are formed. A reinforcing coating layer 6 consisting of a large number of whiskers 5 is provided. That is, by passing the elongated fiber 2 impregnated with the thermosetting resin 3 and the optical fiber 1 coated with the intermediate reinforcing layer 8 together through a die while heating, the thermosetting resin is 3 and the elongated fibers 2 serve as a reinforcing coating layer 6 and are longitudinally attached to the optical fiber 1 via an intermediate reinforcing layer 8.
このとき、熱硬化性樹脂３は常温に冷却される
と収縮して、光フアイバ１の長さ方向に不均一な
側圧をかけてしまい、光フアイバ１に大きなスト
レスを生じさせる虞が生じる。しかし、光フアイ
バ１の外周側には中間補強層８が被覆されている
ので、前記熱硬化樹脂３の収縮変形による不均一
な側圧はかなり緩和され、光フアイバ１に生じる
ストレスを小さくすることができる。また、中間
補強層８を構成する熱可塑性樹脂７の中に多数の
ウイスカー５を含有させ、さらにこのウイスカー
５を光フアイバ１の長さ方向に配向するようにし
ているため、中間補強層８の線膨張係数が小さく
なつて中間補強層８及び光フアイバ１のガラスの
線膨張係数が互に近づくから、温度変化による光
フアイバ１のストレスを小さくすることができ
る。従つて、光フアイバ１におけるマイクロベン
デイングの発生を抑えることができるので伝送損
失の増加を招くおそれがない。 At this time, when the thermosetting resin 3 is cooled to room temperature, it contracts and applies non-uniform lateral pressure in the length direction of the optical fiber 1, which may cause a large stress on the optical fiber 1. However, since the outer peripheral side of the optical fiber 1 is coated with the intermediate reinforcing layer 8, the uneven lateral pressure caused by shrinkage and deformation of the thermosetting resin 3 is considerably alleviated, and the stress generated on the optical fiber 1 can be reduced. can. Further, since the thermoplastic resin 7 constituting the intermediate reinforcing layer 8 contains a large number of whiskers 5 and the whiskers 5 are oriented in the length direction of the optical fiber 1, the intermediate reinforcing layer 8 is Since the coefficient of linear expansion becomes smaller and the coefficients of linear expansion of the glasses of the intermediate reinforcing layer 8 and the optical fiber 1 become closer to each other, stress on the optical fiber 1 due to temperature changes can be reduced. Therefore, since the occurrence of microbending in the optical fiber 1 can be suppressed, there is no risk of an increase in transmission loss.
一方、ウイスカーとよばれる単結晶の微小繊維
が優れた補強性をもつていることに着目して、こ
のウイスカーを、長尺状の繊維に含浸強化された
熱硬化性樹脂３より成る強化被覆層６に含有させ
たものであるため、強靱性に富み、熱硬化性樹脂
と長尺状の繊維との間に界面剥離が生じたり樹脂
にクラツクが生じたりするおそれがない。その上
引張強度が向上して機械的特性がより優れたもの
となる。そしてウイスカーのもつ補強性により、
機械的特性を維持しながら長尺状の繊維の含有割
合を小さくすることができるから、そうすること
によつてその分可撓性を得ることができる。 On the other hand, focusing on the fact that single-crystal microfibers called whiskers have excellent reinforcing properties, we applied these whiskers to a reinforced coating layer made of a thermosetting resin 3 impregnated into elongated fibers. 6, it has high toughness and there is no risk of interfacial peeling between the thermosetting resin and the long fibers or cracks in the resin. Moreover, the tensile strength is improved and the mechanical properties are more excellent. And due to the reinforcing properties of whiskers,
Since the content of long fibers can be reduced while maintaining mechanical properties, flexibility can be obtained accordingly.
考案の効果
以上説明したように本考案によれば、緩衝層と
強化被覆層との間に、光フアイバの長さ方向に配
向させた多数のウイスカーを含有した熱可塑性樹
脂より成る中間補強層を設けたので、熱硬化性樹
脂の収縮変形による不均一な側圧はかなり緩和さ
れ、光フアイバに生じるストレスを小さくするこ
とができる。また、中間補強層の線膨張係数が小
さくなつて中間補強層及び光フアイバのガラスの
線膨張係数が互に近づくから、温度変化による光
フアイバのストレスを小さくすることができる。
従つて、光フアイバにおけるマイクロベンデイン
グの発生を抑えることができるので伝送損失の増
加を招くおそれがない。Effects of the invention As explained above, according to the invention, an intermediate reinforcing layer made of a thermoplastic resin containing a large number of whiskers oriented in the length direction of the optical fiber is provided between the buffer layer and the reinforcing coating layer. Because of this provision, uneven lateral pressure due to contraction and deformation of the thermosetting resin can be considerably alleviated, and the stress generated on the optical fiber can be reduced. Furthermore, since the linear expansion coefficient of the intermediate reinforcing layer becomes smaller and the linear expansion coefficients of the intermediate reinforcing layer and the glass of the optical fiber approach each other, stress on the optical fiber due to temperature changes can be reduced.
Therefore, since the occurrence of microbending in the optical fiber can be suppressed, there is no risk of an increase in transmission loss.
第１図は本考案の実施例に係る強化被覆光フア
イバを示す横断面図、第２図は従来の強化被覆光
フアイバを示す横断面図である。
１……光フアイバ、２……長尺状の繊維、３…
…熱硬化性樹脂、４……強化被覆層、５……ウイ
スカー、６……強化被覆層、７……熱可塑性樹
脂、８……中間補強層。
FIG. 1 is a cross-sectional view of a reinforced coated optical fiber according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a conventional reinforced coated optical fiber. 1... Optical fiber, 2... Long fiber, 3...
...Thermosetting resin, 4... Reinforced coating layer, 5... Whisker, 6... Reinforced coating layer, 7... Thermoplastic resin, 8... Intermediate reinforcing layer.
Claims (1)
と、前記緩衝層の外周を覆うように形成された強
化被覆層とを有して成り、前記強化被覆層は、光
フアイバの長さ方向に沿つて各々伸びる多数の長
尺状の繊維に含浸硬化された熱硬化性樹脂と、こ
の熱硬化性樹脂の中に含有された多数のウイスカ
ーとより成り、前記緩衝層と強化被覆層との間
に、前記光フアイバの長さ方向に配向させた多数
のウイスカーを含有した熱可塑性樹脂より成る中
間補強層を設けたことを特徴とする強化被覆光フ
アイバ。 The optical fiber has an outer peripheral portion formed by a buffer layer, and a reinforcing coating layer formed to cover the outer periphery of the buffer layer, and the reinforcing coating layer extends along the length direction of the optical fiber. It consists of a thermosetting resin impregnated and cured into a large number of elongated fibers, each extending, and a large number of whiskers contained in this thermosetting resin, and between the buffer layer and the reinforcing coating layer, A reinforced coated optical fiber comprising an intermediate reinforcing layer made of a thermoplastic resin containing a large number of whiskers oriented in the longitudinal direction of the optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7539284U JPS60186412U (en) | 1984-05-23 | 1984-05-23 | Reinforced coated optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7539284U JPS60186412U (en) | 1984-05-23 | 1984-05-23 | Reinforced coated optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60186412U JPS60186412U (en) | 1985-12-10 |
| JPH046003Y2 true JPH046003Y2 (en) | 1992-02-19 |
Family
ID=30616572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7539284U Granted JPS60186412U (en) | 1984-05-23 | 1984-05-23 | Reinforced coated optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60186412U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57141605A (en) * | 1981-02-18 | 1982-09-02 | Furukawa Electric Co Ltd:The | Frp-covered optical communication line and optical communication cable using it |
| JPS587364U (en) * | 1981-07-07 | 1983-01-18 | スタンレー電気株式会社 | light emitting diode lamp |
-
1984
- 1984-05-23 JP JP7539284U patent/JPS60186412U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57141605A (en) * | 1981-02-18 | 1982-09-02 | Furukawa Electric Co Ltd:The | Frp-covered optical communication line and optical communication cable using it |
| JPS587364U (en) * | 1981-07-07 | 1983-01-18 | スタンレー電気株式会社 | light emitting diode lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60186412U (en) | 1985-12-10 |
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