JP3877643B2

JP3877643B2 - Optical fiber core

Info

Publication number: JP3877643B2
Application number: JP2002151740A
Authority: JP
Inventors: 源田村; 真赤坂
Original assignee: トヨクニ電線株式会社
Priority date: 2002-05-27
Filing date: 2002-05-27
Publication date: 2007-02-07
Anticipated expiration: 2022-05-27
Also published as: JP2003344726A

Description

【０００１】
【発明の属する技術分野】
本発明は光ファイバ心線に関し、特にＵＬ規格に適合する光ファイバ心線に関する。
【０００２】
【従来の技術】
従来の光ファイバ心線は光ファイバと、この光ファイバの外周部を覆う紫外線硬化樹脂層と、この紫外線硬化樹脂層の外周部に形成された柔軟性熱可塑性樹脂を用いた第１の被覆層と、この第１の被覆層の外周部に形成された半硬質あるいは硬質の熱可塑性樹脂を用いた第２の被覆層を形成した被覆層を形成している。
【０００３】
【発明が解決しようとする課題】
従来の光ファイバ心線は紫外線硬化樹脂層の外周部に形成した被覆層を２層とすることにより、しごき特性、引張特性、曲げ特性、温度特性を十分に満たすことができるが、ＵＬ規格の加熱変形に適合しないという欠点があった。
【０００４】
本発明は以上のような従来の欠点に鑑み、しごき特性、引張特性、曲げ特性、温度特性を十分に満たすとともに、ＵＬ規格の難燃性と加熱変形にも適合する光ファイバ心線を提供することを目的としている。
【０００５】
本発明の前記ならびにそのほかの目的と新規な特徴は次の説明を添付図面と照らし合わせて読むと、より完全に明らかになるであろう。
ただし、図面はもっぱら解説のためのものであって、本発明の技術的範囲を限定するものではない。
【０００６】
【課題を解決するための手段】
上記目的を達成するために、本発明は光ファイバと、この光ファイバの外周部を覆う紫外線硬化樹脂層と、この紫外線硬化樹脂層の外周部を覆う被覆層とからなる光ファイバ心線において、前記被覆層を難燃性低密度の熱可塑性樹脂を用いた第１の被覆層と、この第１の被覆層の外周部に形成された半硬質あるいは硬質の高密度の熱可塑性樹脂あるいは難燃性半硬質あるいは硬質の高密度の熱可塑性樹脂を用いた第２の被覆層と、この第２の被覆層の外周部に形成された難燃性低密度の熱可塑性樹脂を用いた第３の被覆層とで光ファイバ心線を構成している。
【０００７】
【発明の実施の形態】
以下、図面に示す実施の形態により、本発明を詳細に説明する。
【０００８】
図１ないし図３に示す本発明の第１の実施の形態において、１は本発明の光ファイバ心線で、この光ファイバ心線１は直径が１２５μｍの光ファイバ２と、この光ファイバ２の外周部を覆う直径が１２５μｍとなる紫外線硬化樹脂層３と、この紫外線硬化樹脂層３の外周部を覆う難燃性低密度のポリエチレン樹脂を用いた第１の被覆層４、この第１の被覆層４の外周部に形成された高密度のポリエチレン樹脂あるいは難燃性高密度のポリエチレン樹脂を用いた第２の被覆層５および、この第２の被覆層５の外周部に形成された難燃性低密度のポリエチレン樹脂を用いた第３の被覆層６とからなる被覆層７とで構成されている。
【０００９】
上記構成の光ファイバ心線１の被覆層７が難燃性低密度の第１の被覆層４と第３の被覆層６との間に、高密度の第２の被覆層５を介装しているため、しごき特性、引張特性、曲げ特性、温度特性を十分に満たすとともに、ＵＬ規格の難燃性と加熱変形にも適合させることができる。
【００１０】
【発明の異なる実施の形態】
次に、図４ないし図７に示す本発明の異なる実施の形態につき説明する。なお、これらの本発明の異なる実施の形態の説明に当って、前記本発明の第１の実施の形態と同一構成部分には同一符号を付して重複する説明を省略する。
【００１１】
図４および図５に示す本発明の第２の実施の形態において、前記本発明の第１の実施の形態と主に異なる点は、被覆層７Ａを難燃性低密度のノンハロゲンの熱可塑性樹脂を用いた第１の被覆層４Ａと、半硬質あるいは硬質の高密度あるいは難燃性半硬質あるいは硬質の高密度のノンハロゲンの熱可塑性樹脂を用いた第２の被覆層５Ａと、難燃性低密度のノンハロゲンの熱可塑性樹脂を用いた第３の被覆層６Ａとで構成した点で、このように形成した被覆層７Ａを用いて構成した光ファイバ心線１Ａにしても、前記本発明の第１の実施の形態と同様な作用効果が得られる。
【００１２】
図６および図７に示す本発明の第３の実施の形態において、前記本発明の第１の実施の形態と主に異なる点は、厚さが０．１〜０．１５ｍｍの第１の被覆層４Ｂ、厚さが０．０３〜０．１ｍｍの第２の被覆層５Ｂ、厚さが０．０８ｍｍ以上の第３の被覆層６Ｂとで被覆層７Ｂを形成した点で、このように形成された被覆層７Ｂを用いて構成した光ファイバ心線１Ｂにしても、前記本発明の第１の実施の形態と同様な作用効果が得られる。
【００１３】
【発明の効果】
以上の説明から明らかなように、本発明にあっては次に列挙する効果が得られる。
【００１４】
（１）光ファイバと、この光ファイバの外周部を覆う紫外線硬化樹脂層と、この紫外線硬化樹脂層の外周部を覆う被覆層とからなる光ファイバ心線において、前記被覆層を難燃性低密度の熱可塑性樹脂を用いた第１の被覆層と、この第１の被覆層の外周部に形成された半硬質あるいは硬質の高密度の熱可塑性樹脂あるいは難燃性半硬質あるいは硬質の高密度の熱可塑性樹脂を用いた第２の被覆層と、この第２の被覆層の外周部に形成された難燃性低密度の熱可塑性樹脂を用いた第３の被覆層とで構成したので、しごき特性、引張特性、曲げ特性、温度特性を十分に満たすとともに、ＵＬ規格の難燃性と加熱変形にも適合させることができる。
【００１５】
（２）前記（１）によって、構造が簡単であるので、容易に製造することができる。
【００１６】
（３）前記（１）によって、被覆層を形成する第１の被覆層、第２の被覆層、第３の被覆層の材質の選定および各層の厚さ寸法を選択することにより、自由に使用目的に応じた特性が得られる。
【００１７】
（４）請求項２、３、４も前記（１）〜（３）と同様な効果が得られる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態の平面図。
【図２】本発明の第１の実施の形態の側面図。
【図３】図１の３−３線に沿う拡大断面図。
【図４】本発明の第２の実施の形態の平面図。
【図５】図４の５−５線に沿う拡大断面図。
【図６】本発明の第３の実施の形態の平面図。
【図７】図６の７−７線に沿う拡大断面図。
【符号の説明】
１、１Ａ、１Ｂ：光ファイバ心線、
２：光ファイバ、
３：紫外線硬化樹脂層、
４、４Ａ、４Ｂ：第１の被覆層、
５、５Ａ、５Ｂ：第２の被覆層、
６、６Ａ、６Ｂ：第３の被覆層、
７、７Ａ、７Ｂ：被覆層。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical fiber core, and more particularly to an optical fiber core conforming to UL standards.
[0002]
[Prior art]
A conventional optical fiber core includes an optical fiber, an ultraviolet curable resin layer covering the outer peripheral portion of the optical fiber, and a first coating layer using a flexible thermoplastic resin formed on the outer peripheral portion of the ultraviolet curable resin layer. And the coating layer which formed the 2nd coating layer using the semi-rigid or hard thermoplastic resin formed in the outer peripheral part of this 1st coating layer is formed.
[0003]
[Problems to be solved by the invention]
The conventional optical fiber core wire can sufficiently satisfy the ironing property, tensile property, bending property, and temperature property by making the coating layer formed on the outer peripheral portion of the ultraviolet curable resin layer into two layers. There was a drawback that it was not suitable for heating deformation.
[0004]
SUMMARY OF THE INVENTION In view of the above-described conventional drawbacks, the present invention provides an optical fiber core wire that sufficiently satisfies ironing characteristics, tensile characteristics, bending characteristics, and temperature characteristics, and that is compatible with UL flame retardancy and heat deformation. The purpose is that.
[0005]
The above and other objects and novel features of the present invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings.
However, the drawings are for explanation only and do not limit the technical scope of the present invention.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an optical fiber comprising an optical fiber, an ultraviolet curable resin layer covering the outer peripheral portion of the optical fiber, and a coating layer covering the outer peripheral portion of the ultraviolet curable resin layer. The coating layer includes a first coating layer using a flame-retardant low-density thermoplastic resin, and a semi-rigid or hard high-density thermoplastic resin or flame-retardant formed on the outer periphery of the first coating layer. A second coating layer using a porous semi-rigid or hard high-density thermoplastic resin, and a third coating using a flame-retardant low-density thermoplastic resin formed on the outer periphery of the second coating layer An optical fiber core wire is constituted by the coating layer.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
[0008]
In the first embodiment of the present invention shown in FIGS. 1 to 3, reference numeral 1 denotes an optical fiber core of the present invention. The optical fiber core 1 includes an optical fiber 2 having a diameter of 125 μm and an optical fiber 2 of the optical fiber 2. An ultraviolet curable resin layer 3 having a diameter of 125 μm covering the outer peripheral portion, a first coating layer 4 using a flame-retardant low-density polyethylene resin covering the outer peripheral portion of the ultraviolet curable resin layer 3, and the first coating A second coating layer 5 using a high-density polyethylene resin or a flame-retardant high-density polyethylene resin formed on the outer periphery of the layer 4, and a flame-retardant formed on the outer periphery of the second coating layer 5 It is comprised with the coating layer 7 which consists of the 3rd coating layer 6 using a low-density polyethylene resin.
[0009]
The coating layer 7 of the optical fiber core wire 1 having the above-described configuration has the high-density second coating layer 5 interposed between the flame-retardant low-density first coating layer 4 and the third coating layer 6. Therefore, the ironing characteristic, the tensile characteristic, the bending characteristic, and the temperature characteristic are sufficiently satisfied, and the flame retardancy and heat deformation of UL standard can be adapted.
[0010]
Different Embodiments of the Invention
Next, different embodiments of the present invention shown in FIGS. 4 to 7 will be described. In the description of the different embodiments of the present invention, the same components as those in the first embodiment of the present invention are denoted by the same reference numerals, and redundant description is omitted.
[0011]
The second embodiment of the present invention shown in FIGS. 4 and 5 is mainly different from the first embodiment of the present invention in that the coating layer 7A is made of a flame retardant low density non-halogen thermoplastic resin. A first coating layer 4A using a semi-rigid or hard high-density or flame-retardant semi-rigid or hard high-density non-halogen thermoplastic resin, and a low flame-retardant property. The optical fiber core wire 1A configured using the coating layer 7A formed in this manner is also configured by the third coating layer 6A using a non-halogen thermoplastic resin having a high density. The same effects as those of the first embodiment can be obtained.
[0012]
The third embodiment of the present invention shown in FIGS. 6 and 7 is mainly different from the first embodiment of the present invention in that the first coating having a thickness of 0.1 to 0.15 mm. Formed in this way in that the coating layer 7B is formed by the layer 4B, the second coating layer 5B having a thickness of 0.03 to 0.1 mm, and the third coating layer 6B having a thickness of 0.08 mm or more. Even if the optical fiber core wire 1B is configured using the coated layer 7B, the same effects as those of the first embodiment of the present invention can be obtained.
[0013]
【The invention's effect】
As is clear from the above description, the present invention has the following effects.
[0014]
(1) An optical fiber core comprising an optical fiber, an ultraviolet curable resin layer covering the outer periphery of the optical fiber, and a coating layer covering the outer periphery of the ultraviolet curable resin layer. A first coating layer using a thermoplastic resin having a high density, and a semi-rigid or rigid high-density thermoplastic resin or a flame-retardant semi-rigid or rigid high-density formed on the outer periphery of the first coating layer Since the second coating layer using the thermoplastic resin of the second and the third coating layer using a flame-retardant low-density thermoplastic resin formed on the outer periphery of the second coating layer, The ironing property, tensile property, bending property, and temperature property are sufficiently satisfied, and the flame retardancy and heat deformation of UL standard can be adapted.
[0015]
(2) According to the above (1), since the structure is simple, it can be easily manufactured.
[0016]
(3) According to the above (1), the first coating layer, the second coating layer, the material of the third coating layer, and the thickness dimension of each layer can be freely used by forming the coating layer. Characteristics according to the purpose can be obtained.
[0017]
(4) Claims 2, 3, and 4 can provide the same effects as the above (1) to (3).
[Brief description of the drawings]
FIG. 1 is a plan view of a first embodiment of the present invention.
FIG. 2 is a side view of the first embodiment of the present invention.
3 is an enlarged cross-sectional view taken along line 3-3 in FIG.
FIG. 4 is a plan view of a second embodiment of the present invention.
5 is an enlarged cross-sectional view taken along line 5-5 of FIG.
FIG. 6 is a plan view of a third embodiment of the present invention.
7 is an enlarged cross-sectional view taken along line 7-7 in FIG.
[Explanation of symbols]
1, 1A, 1B: optical fiber core wire,
2: Optical fiber
3: UV curable resin layer,
4, 4A, 4B: 1st coating layer,
5, 5A, 5B: second coating layer,
6, 6A, 6B: a third coating layer,
7, 7A, 7B: coating layer.

Claims

An optical fiber core comprising an optical fiber, an ultraviolet curable resin layer covering the outer periphery of the optical fiber, and a coating layer covering the outer periphery of the ultraviolet curable resin layer. A first coating layer using a plastic resin and a semi-rigid or rigid high-density thermoplastic resin or a flame-retardant semi-rigid or rigid high-density thermoplastic formed on the outer periphery of the first coating layer It is characterized by comprising a second coating layer using a resin and a third coating layer using a flame-retardant low-density thermoplastic resin formed on the outer periphery of the second coating layer. Optical fiber core.

In an optical fiber core comprising an optical fiber, an ultraviolet curable resin layer covering the outer peripheral portion of the optical fiber, and a coating layer covering the outer peripheral portion of the ultraviolet curable resin layer, the coating layer is made of a flame-retardant low-density polyolefin A first coating layer using a thermoplastic resin, and a second coating layer using a semi-rigid or hard high-density polyolefin-based thermoplastic resin formed on the outer periphery of the first coating layer; An optical fiber core comprising: a third coating layer using a flame-retardant low-density polyolefin-based thermoplastic resin formed on the outer peripheral portion of the second coating layer.

In an optical fiber core consisting of an optical fiber having a diameter of 125 μm, an ultraviolet curable resin layer covering the outer periphery of the optical fiber so that the diameter is 250 μm, and a coating layer covering the outer periphery of the ultraviolet curable resin layer, A first coating layer using a flame-retardant low-density thermoplastic resin having a thickness of 0.1 to 0.15 mm and a thickness formed on the outer periphery of the first coating layer A second coating layer using a high-density thermoplastic resin having a thickness of 0.03 to 0.1 mm, and a low flame-retardant property having a thickness of 0.08 mm or more formed on the outer periphery of the second coating layer An optical fiber core wire comprising a third coating layer using a thermoplastic resin having a high density.

In an optical fiber core consisting of an optical fiber having a diameter of 125 μm, an ultraviolet curable resin layer covering the outer periphery of the optical fiber so that the diameter is 250 μm, and a coating layer covering the outer periphery of the ultraviolet curable resin layer, The coating layer has a first coating layer using a flame-retardant low-density polyethylene resin having a thickness of 0.1 to 0.15 mm, and a thickness formed on the outer periphery of the first coating layer. A second coating layer using a high-density polyethylene resin of 0.03 to 0.1 mm and a flame-retardant low-density having a thickness of 0.08 mm or more formed on the outer periphery of the second coating layer An optical fiber core wire comprising a third coating layer using a polyethylene resin.