JP2014077877A - Optical fiber cable - Google Patents

Optical fiber cable Download PDF

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Publication number
JP2014077877A
JP2014077877A JP2012225134A JP2012225134A JP2014077877A JP 2014077877 A JP2014077877 A JP 2014077877A JP 2012225134 A JP2012225134 A JP 2012225134A JP 2012225134 A JP2012225134 A JP 2012225134A JP 2014077877 A JP2014077877 A JP 2014077877A
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Japan
Prior art keywords
optical fiber
tape
sheath
cable
fiber cable
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JP2014077877A5 (en
Inventor
Koji Tomikawa
浩二 富川
Naoki Okada
直樹 岡田
Daiki Takeda
大樹 竹田
Masayoshi Yamanaka
正義 山中
Hisaaki Nakane
久彰 中根
Masaya Hamaguchi
真弥 浜口
Daisuke Tsunoda
大祐 角田
Yusuke Yamada
裕介 山田
Masahiko Shibata
征彦 柴田
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Fujikura Ltd
Nippon Telegraph and Telephone Corp
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Fujikura Ltd
Nippon Telegraph and Telephone Corp
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Priority to JP2012225134A priority Critical patent/JP2014077877A/en
Publication of JP2014077877A publication Critical patent/JP2014077877A/en
Publication of JP2014077877A5 publication Critical patent/JP2014077877A5/ja
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Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber cable which enables easy and quick cable-stripping work in which optical fibers inside do not pop out when a sheath is removed but comes out only when a wrapping tape is unwrapped by hand.SOLUTION: An optical fiber cable 1 comprises an optical fiber core 5 which is covered by a wrapping tape 6 in such a way that two ends 6a and 6b of tape overlap with each other and then is covered by a sheath 7. A relationship between a tape wrapping ratio P, representing a ratio of the overlap between the two ends 6a and 6b of tape to width of the wrapping tape 6, and thickness t of the wrapping tape shall be such that an expression (P-1)/t is no less than 0.018 for the optical fiber cable 1. This prevents the overlapped portion of the wrapping tape from being unwrapped when the sheath is removed in cable stripping work.

Description

本発明は、光ファイバコアを押え巻きテープで被覆し、それらをシースで覆ってなる光ファイバケーブルに関する。   The present invention relates to an optical fiber cable in which an optical fiber core is covered with a press-wound tape and covered with a sheath.

例えば、特許文献1には、複数本の光ファイバを束ねプラスチックフィルムで縦添えしたものをシースで被覆した光ファイバケーブルが開示されております。この種の光ファイバケーブルでは、光ファイバコアの周囲に押え巻きテープを縦添えした場合、製造時に押え巻きテープが開いて内部の光ファイバが飛び出さないようにするために粗巻き糸が押え巻きテープの上に巻き付けられることがある。   For example, Patent Document 1 discloses an optical fiber cable in which a plurality of optical fibers are bundled and vertically attached with a plastic film and covered with a sheath. In this type of optical fiber cable, when presser winding tape is vertically attached around the optical fiber core, the coarsely wound thread is pressed to prevent the inner optical fiber from popping out during the manufacturing process. May be wrapped on tape.

特開平8−271773号公報JP-A-8-271773

しかし、粗巻き糸は、ケーブル口出し作業時に除去する必要があり、一般的には刃物を使用して除去するため、内部の光ファイバを傷付けないように注意する必要があることから作業時間が多く掛かる。   However, it is necessary to remove the coarsely wound yarn at the time of cable lead-out work, and since it is generally removed using a blade, it is necessary to be careful not to damage the internal optical fiber, so it takes a lot of work time. It takes.

そこで、本発明は、ケーブル口出し作業時にシースを除去しても内部の光ファイバが飛び出すことがなく、押え巻きテープを手で開くことで初めて光ファイバを取り出すことができる口出し作業を容易且つ短時間で行うことのできる光ファイバケーブルを提供することを目的とする。   Therefore, the present invention does not cause the internal optical fiber to jump out even if the sheath is removed during cable extraction work, and makes it easy and quick to extract the optical fiber for the first time by manually opening the presser winding tape. An object of the present invention is to provide an optical fiber cable that can be used in the network.

第1の発明は、光ファイバコアを内部に収容するようにテープ両端を重ね合わせるようにして押え巻きテープで被覆し、それらをシースで覆ってなる光ファイバケーブルであって、前記押え巻きテープのテープ幅に対するテープ両端が重なる割合を示すテープラップ率Pと、押え巻きテープのテープ厚tとの関係(P−1)/tが0.018以上であることを特徴としている。   According to a first aspect of the present invention, there is provided an optical fiber cable in which both ends of a tape are overlapped so as to accommodate an optical fiber core and covered with a press-wrapping tape, and these are covered with a sheath. The relationship (P-1) / t between the tape wrap ratio P indicating the ratio of the tape ends overlapping the tape width and the tape thickness t of the press-wound tape is 0.018 or more.

第2の発明は、第1の発明であって、前記押え巻きテープは、予め熱により癖付けされて円筒形状とされたことを特徴としている。   2nd invention is 1st invention, Comprising: The said press-wound tape was brazed beforehand with the heat | fever, and was made into the cylindrical shape, It is characterized by the above-mentioned.

第3の発明は、第1の発明であって、前記押え巻きテープは、シース被覆時の熱で癖付けされて円筒形状とされたことを特徴としている。   3rd invention is 1st invention, Comprising: The said press-wound tape is brazed with the heat | fever at the time of sheath coating | cover, It was characterized by the cylindrical shape.

本発明によれば、テープラップ率Pと押え巻きテープのテープ厚tとの関係(P−1)/tが0.018以上であるので、口出し作業時にシースを除去しても押え巻きテープの重なり部が口開きしない。その結果、押え巻きテープの内部に収容された光ファイバが飛び出すのを防止することができ、ケーブル口出し作業を容易且つ短時間で行うことが可能となる。   According to the present invention, since the relationship (P-1) / t between the tape wrap ratio P and the tape thickness t of the presser winding tape is 0.018 or more, even if the sheath is removed during the opening operation, The overlapping part does not open. As a result, it is possible to prevent the optical fiber accommodated in the press-wound tape from jumping out, and the cable opening operation can be performed easily and in a short time.

図1は本実施形態の光ファイバケーブルの横断面図である。FIG. 1 is a cross-sectional view of the optical fiber cable of the present embodiment. 図2は実験に使用した試料の光ファイバケーブルの横断面図である。FIG. 2 is a cross-sectional view of a sample optical fiber cable used in the experiment. 図3はテープ厚と(P−1)/tによる後分岐作業時の光ファイバコア保持特性を示す図である。FIG. 3 is a diagram showing optical fiber core retention characteristics during post-branching work based on the tape thickness and (P-1) / t.

以下、本発明を適用した具体的な実施形態について図面を参照しながら詳細に説明する。
図1に示すように、光ファイバケーブル1は、複数本の光ファイバ2をバンチング糸3で束ねた光ファイバ束4の数本を纏めて光ファイバコア5とし、その光ファイバコア5を内部に収容するようにテープ両端6a,6bを重ね合わせるようにして押え巻きテープ6で被覆し、それらをシース7で被覆した構造となっている。
Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.
As shown in FIG. 1, an optical fiber cable 1 includes a plurality of optical fiber bundles 4 in which a plurality of optical fibers 2 are bundled with a bunching yarn 3 to form an optical fiber core 5. The tape is covered with the press-wound tape 6 so that the tape ends 6 a and 6 b are overlapped so as to be housed, and these are covered with the sheath 7.

光ファイバ2は、中心に設けられる石英ガラスファイバの周囲に紫外線硬化型樹脂及び着色層を被覆して形成される着色光ファイバ素線からなる。また、着色光ファイバ素線を複数本並べて紫外線硬化型樹脂で一括被覆した光ファイバテープ心線や、互いに隣接する着色光ファイバ素線間を間欠的に固定した光ファイバテープ心線も、本発明の光ファイバ2に含むとする。   The optical fiber 2 is made of a colored optical fiber formed by coating an ultraviolet curable resin and a colored layer around a quartz glass fiber provided at the center. In addition, an optical fiber tape core wire in which a plurality of colored optical fiber strands are arranged and collectively covered with an ultraviolet curable resin, and an optical fiber tape core wire in which colored optical fiber strands adjacent to each other are intermittently fixed are also included in the present invention. It is assumed that the optical fiber 2 is included.

バンチング糸3は、各光ファイバ束4同士を識別できるように異なる色のものを使用することが望ましい。そうすることで、どの光ファイバ束4に属する光ファイバ2であるかを目視により認識することができる。   It is desirable to use bunching yarns of different colors so that the optical fiber bundles 4 can be distinguished from each other. By doing so, it is possible to visually recognize which optical fiber bundle 4 the optical fiber 2 belongs to.

図1では、光ファイバ束4の数本を纏めて光ファイバコア5としているが、複数本の光ファイバ2をバンチング糸3で束ねた光ファイバ束4の1本を光ファイバコア5とすることもできる。つまり、光ファイバコア5は、光ファイバ束4が1本であろうが数本であろうがどちらでもよい。   In FIG. 1, several optical fiber bundles 4 are grouped into an optical fiber core 5, but one optical fiber bundle 4 in which a plurality of optical fibers 2 are bundled with a bunching yarn 3 is used as an optical fiber core 5. You can also. That is, the optical fiber core 5 may be either one or several optical fiber bundles 4.

押え巻きテープ6は、帯状のプラスチックフィルムの幅方向両端であるフィルム両端縁6a,6bを円周方向で一部重なる重なり部8が形成されるように円筒形状に成形することで形成されている。押え巻きテープ6は、予め熱により癖付けされて円筒形状とされるか、或いは、シース被覆時の熱で癖付けされて円筒形状とされる。   The press-wound tape 6 is formed by forming a film shape into a cylindrical shape so that an overlapping portion 8 that partially overlaps in the circumferential direction is formed at both end edges 6a and 6b in the width direction of the belt-shaped plastic film. . The presser winding tape 6 is preliminarily brazed with heat to have a cylindrical shape, or is brazed with heat at the time of sheath coating to have a cylindrical shape.

シース7には、ケーブルに曲げ方向性を持たせるために、ケーブルの中心を通る同一線上に2本の抗張力体9,9がケーブル長手方向に埋め込まれている。また、シース7には、ケーブル口出し時にシース7を引き裂き易くするための引き裂き紐10,10が設けられている。引き裂き紐10,10は、シース7を引き裂いて内部の光ファイバ束4を取り出し易くするために、押え巻きテープ6に接して或いはその近傍部に設けられている。   In the sheath 7, two strength members 9 and 9 are embedded in the longitudinal direction of the cable on the same line passing through the center of the cable in order to give the cable a bending direction. The sheath 7 is provided with tear strings 10 and 10 for facilitating the tearing of the sheath 7 when the cable is opened. The tear strings 10 and 10 are provided in contact with the presser winding tape 6 or in the vicinity thereof in order to tear the sheath 7 and easily take out the optical fiber bundle 4 inside.

特に本実施形態では、中間後分岐作業時などにおいてシース7を引き裂いた時に押え巻きテープ6で覆った光ファイバ2がケーブル外に飛び出さないようにするための手段を講じている。具体的には、押え巻きテープ6のテープ幅に対するテープ両端6a,6bが重なる割合を示すテープラップ率Pと、押え巻きテープ6のテープ厚tとの関係(P−1)/tが0.018以上であるようにする。このような関係に押え巻きテープ6を円筒形状に成形すると、シース6を引き裂いても押え巻きテープ6の重なり部8が開かずに内部の光ファイバ2の飛び出しを防止することができる。   In particular, in the present embodiment, a means is provided for preventing the optical fiber 2 covered with the press-wound tape 6 from jumping out of the cable when the sheath 7 is torn at the time of intermediate post-branching work or the like. Specifically, the relationship (P-1) / t between the tape wrap ratio P indicating the ratio of the tape ends 6a and 6b overlapping the tape width of the press-wound tape 6 and the tape thickness t of the press-wound tape 6 is 0. It should be 018 or more. If the press-wound tape 6 is formed into a cylindrical shape in such a relationship, even if the sheath 6 is torn, the overlapping portion 8 of the press-wound tape 6 does not open and the internal optical fiber 2 can be prevented from jumping out.

通常、光ファイバコア5は、伝送特性や歪み特性を確保する目的で、ケーブルに対して若干の余長を持った構造となっている。このため、シース7を除去した際にケーブル内部から光ファイバコア5が飛び出し易くなっている。そこで、本実施形態では、押え巻きテープ6のテープラップ率Pを高くすることで、シース除去時の光ファイバ2が飛び出す力を抑え、光ファイバ2をラップ内に閉じこめた状態にすることが、前記条件で可能となった。   Usually, the optical fiber core 5 has a structure having a slight extra length with respect to the cable in order to ensure transmission characteristics and distortion characteristics. For this reason, when the sheath 7 is removed, the optical fiber core 5 easily protrudes from the inside of the cable. Therefore, in the present embodiment, by increasing the tape wrap ratio P of the presser winding tape 6, it is possible to suppress the force of the optical fiber 2 jumping out at the time of sheath removal, and to keep the optical fiber 2 confined in the wrap. Made possible under the above conditions.

以上のように、本実施形態の光ファイバケーブル1によれば、テープラップ率Pと押え巻きテープ6のテープ厚tとの関係(P−1)/tが0.018以上であるので、口出し作業時(中間後分岐作業時も含む)にシース7を除去しても押え巻きテープ6の重なり部8が口開きしない。その結果、押え巻きテープ6の内部に収容された光ファイバ2が飛び出すのを防止することができ、ケーブル口出し作業を容易且つ短時間で行うことが可能となる。   As described above, according to the optical fiber cable 1 of the present embodiment, the relationship (P-1) / t between the tape wrap ratio P and the tape thickness t of the presser winding tape 6 is 0.018 or more. Even if the sheath 7 is removed during the operation (including the intermediate post-branch operation), the overlapping portion 8 of the presser winding tape 6 does not open. As a result, it is possible to prevent the optical fiber 2 housed inside the press-wound tape 6 from jumping out, and the cable lead-out operation can be performed easily and in a short time.

また、本実施形態の光ファイバケーブル1によれば、押え巻きテープ6は予め熱により癖付けされて円筒形状とされるので、癖付けされた押え巻きテープ6により重なり部8がより一層開き難くなる。   Further, according to the optical fiber cable 1 of the present embodiment, since the presser winding tape 6 is preliminarily brazed by heat to have a cylindrical shape, the overlapping portion 8 is more difficult to open by the brazed presser winding tape 6. Become.

また、本実施形態の光ファイバケーブル1によれば、押え巻きテープ6はシース被覆時の熱で癖付けされて円筒形状とされているので、シース7を被覆する作業と同時に押え巻きテープ6を円筒形状とすることができ作業性が良くなる。   Further, according to the optical fiber cable 1 of the present embodiment, since the presser winding tape 6 is brazed into a cylindrical shape by the heat at the time of sheath coating, the presser winding tape 6 is attached simultaneously with the operation of covering the sheath 7. Cylindrical shape can be achieved and workability is improved.

表1に示す条件で試作した光ファイバケーブルを後分岐作業して光ファイバコア保持性を評価した。なお、光ファイバコアの直径は、4.5〜6.0mmのケーブルで試作し評価した。表1は、テープラップ率とテープ厚との関係を示し、光ファイバの飛び出しがあった場合を×、光ファイバの飛び出しが無かった場合を○とした。図2は重なり部の少ない光ファイバケーブル1の横断面図を示す。図3はテープ厚と(P−1)/tによる後分岐時の光ファイバコア保持特性を示す。図3では、光ファイバの飛び出しがあった場合を×、光ファイバの飛び出しが無かった場合を○とした。   The optical fiber cable fabricated on the conditions shown in Table 1 was post-branched to evaluate the optical fiber core retention. The diameter of the optical fiber core was prototyped and evaluated with a cable of 4.5 to 6.0 mm. Table 1 shows the relationship between the tape wrap ratio and the tape thickness. The case where the optical fiber jumped out was indicated as x, and the case where the optical fiber did not jump out was indicated as ◯. FIG. 2 shows a cross-sectional view of the optical fiber cable 1 with few overlapping portions. FIG. 3 shows the optical fiber core retention characteristics at the time of post-branching according to the tape thickness and (P-1) / t. In FIG. 3, the case where the optical fiber jumped out was indicated as x, and the case where the optical fiber did not jump out was indicated as ◯.

Figure 2014077877
Figure 2014077877

この結果、ラップ率Pと押え巻きテープのテープ厚tとの関係(P−1)/tが0.018以上のとき、良好な光ファイバコアの保持性が得られることが判った。   As a result, it was found that when the relationship (P-1) / t between the wrap ratio P and the tape thickness t of the press-wound tape was 0.018 or more, good optical fiber core retention was obtained.

本発明は、光ファイバコアを内部に収容するようにテープ両端を重ね合わせるようにして押え巻きテープで被覆し、それらをシースで覆ってなる光ファイバケーブルに利用することができる。   The present invention can be used for an optical fiber cable in which both ends of a tape are overlapped with each other so as to accommodate an optical fiber core and covered with a press-wound tape and covered with a sheath.

1 光ファイバケーブル
2 光ファイバ
3 バンドル糸
4 光ファイバ束
5 光ファイバコア
6 押え巻きテープ
7 シース
8 重なり部
DESCRIPTION OF SYMBOLS 1 Optical fiber cable 2 Optical fiber 3 Bundle thread 4 Optical fiber bundle 5 Optical fiber core 6 Press winding tape 7 Sheath 8 Overlapping part

Claims (3)

光ファイバコアを内部に収容するようにテープ両端を重ね合わせるようにして押え巻きテープで被覆し、それらをシースで覆ってなる光ファイバケーブルであって、
前記押え巻きテープのテープ幅に対するテープ両端が重なる割合を示すテープラップ率Pと、押え巻きテープのテープ厚tとの関係(P−1)/tが0.018以上である
ことを特徴とする光ファイバケーブル。
An optical fiber cable in which both ends of the tape are overlapped so as to accommodate the optical fiber core and covered with a press-wrapping tape, and they are covered with a sheath,
The relationship (P-1) / t between the tape wrap ratio P indicating the ratio of both ends of the tape to the tape width of the press-wound tape and the tape thickness t of the press-wound tape is 0.018 or more. Fiber optic cable.
請求項1に記載の光ファイバケーブルであって、
前記押え巻きテープは、予め熱により癖付けされて円筒形状とされた
ことを特徴とする光ファイバケーブル。
The optical fiber cable according to claim 1,
The optical fiber cable is characterized in that the presser winding tape is preliminarily brazed by heat into a cylindrical shape.
請求項1に記載された光ファイバケーブルであって、
前記押え巻きテープは、シース被覆時の熱で癖付けされて円筒形状とされた
ことを特徴とする光ファイバケーブル。
An optical fiber cable according to claim 1, wherein
The optical fiber cable is characterized in that the presser winding tape is formed into a cylindrical shape by brazing with heat at the time of sheath coating.
JP2012225134A 2012-10-10 2012-10-10 Optical fiber cable Pending JP2014077877A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016080850A (en) * 2014-10-16 2016-05-16 古河電気工業株式会社 Optical fiber cable and manufacturing method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09152529A (en) * 1995-11-29 1997-06-10 Mitsubishi Cable Ind Ltd Optical fiber cable
JPH11344655A (en) * 1998-06-02 1999-12-14 Fujikura Ltd Presser tape for optical cable
JP2009116018A (en) * 2007-11-06 2009-05-28 Sumitomo Electric Ind Ltd Optical cable and method of manufacturing the same
JP2011123472A (en) * 2009-11-13 2011-06-23 Fujikura Ltd Optical fiber cable and method for manufacturing the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09152529A (en) * 1995-11-29 1997-06-10 Mitsubishi Cable Ind Ltd Optical fiber cable
JPH11344655A (en) * 1998-06-02 1999-12-14 Fujikura Ltd Presser tape for optical cable
JP2009116018A (en) * 2007-11-06 2009-05-28 Sumitomo Electric Ind Ltd Optical cable and method of manufacturing the same
JP2011123472A (en) * 2009-11-13 2011-06-23 Fujikura Ltd Optical fiber cable and method for manufacturing the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016080850A (en) * 2014-10-16 2016-05-16 古河電気工業株式会社 Optical fiber cable and manufacturing method thereof

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