【発明の詳細な説明】〔産業上の利用分野〕本発明は布設後、後分岐を可能とした平型光ファイバケ
ーブルに関し、とくに１本゛または複数本の光ファイバ
心線な、抗張力体を埋め込んだ平型外被内に収納する分
岐用平型光ファイバケーブルに関するものでおる。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a flat optical fiber cable that can be branched after installation, and in particular, to a flat optical fiber cable that can be branched after installation, and particularly to a flat optical fiber cable that has a tensile strength member such as one or more optical fiber cores. This invention relates to a branching flat optical fiber cable housed within an embedded flat jacket.
従来の平型光ファイバケーブルは、抗張力体に光ファイ
バ心線を平行に沿わせ、外被を被覆した構造を有してい
る（たとえば、研究実用化報告第５４巻第５号１９５貞
〜１９４貞日本電信電話株式会社研究開発本部）。Conventional flat optical fiber cables have a structure in which optical fiber cores run parallel to a tensile strength member and are coated with an outer sheath (for example, Research and Practical Application Report Vol. 54, No. 5, 195-194). Nippon Telegraph and Telephone Co., Ltd. Research and Development Headquarters).
従来の平型光ファイバケーブルは、抗張力体に沿って平
行に光ファイバ心線を配置し、外被を施した構造である
ことから、光ファイバ心線の長さはケーブルの長さに等
しくなる。そのため、従来ノ平型光７アイバケーブルは
、布設後に分岐・接続を必要とする場合、一旦布設した
後、ケーブルを途中で切断し、再び接続するという作業
、所謂、後分岐を行うことが極めて困難となるという問
題がある。Conventional flat optical fiber cables have a structure in which optical fibers are arranged in parallel along a tensile strength member and coated with an outer jacket, so the length of the optical fibers is equal to the length of the cable. . For this reason, with conventional flat type optical 7-eye cables, if branching or connection is required after installation, it is extremely difficult to perform so-called post-branching, which involves cutting the cable midway and reconnecting it once it has been laid. The problem is that it is difficult.
本発明拡従来の問題点を解決する之め、抗張力体を埋め
込んだ平型の外被内に１本または複数本の光ファイバ心
線を収納し、光ファイバ心線はそれぞれ余長形成部を備
えた構造を有することを特徴とし、とくに光ファイバ心
線の余長形成部は、円弧状、正弦曲線状または折り返し
状に形成したことを特徴としている。In order to solve the problems of the conventional extension of the present invention, one or more coated optical fibers are housed in a flat jacket in which a tensile strength member is embedded, and each coated optical fiber has an extra length forming part. In particular, the extra length forming portion of the optical fiber core is formed in an arc shape, a sinusoidal curve shape, or a folded shape.
本発明の分岐用平型光ファイバケーブルは、抗張力体を
埋め込んだ平型の外被内に、円弧状または正弦曲線状あ
るいは折り返し状に形成した余長形成部を有する１本ま
たは複数本の光ファイバ心線を収納する構造でるること
から、布設時は光ファイバ心線の余長形成部は伸ばされ
ることはなく、布設後の後分岐が必要となった場合には
、ケーブルを必Ｊｓな箇所で切断し、収納しである光フ
ァイバ心線の余長形成１＠ｓを引伸ばしＣ光ファイバ心
線を引出し、接続に必要な余長な得ることができる。The branching flat optical fiber cable of the present invention has one or more optical fibers having an extra length forming part formed in an arc shape, a sinusoidal curve shape, or a folded shape in a flat jacket in which a tensile strength member is embedded. Since the structure is to accommodate the fiber core, the excess length of the optical fiber core will not be stretched during installation, and if branching is required after installation, the cable must be unstretched. The extra length of the optical fiber coated wire 1@s that is cut at a point and stored is stretched and the C optical fiber coated wire is drawn out to obtain the extra length necessary for connection.
以下図面にもとづき実施例について説明する。Examples will be described below based on the drawings.
第１図ａ、ｂは本発明の分岐用平型光ファイバケーブル
の一実施例の構造を示す図である。１は抗張力体で、平
型の外被３の長径端部に埋め込゛まれている。２は外被
３内に収納される光２アイパ心線で、本実施例は１本の
例でめり、円弧状の余長形成部な備え、分岐・接続に際
しての余長を有する構造である。FIGS. 1a and 1b are diagrams showing the structure of an embodiment of the branching flat optical fiber cable of the present invention. Reference numeral 1 denotes a tensile strength member, which is embedded in the long diameter end of the flat outer sheath 3. Reference numeral 2 denotes an optical 2-IPA core wire housed in the outer sheath 3. In this embodiment, one wire is bent, has an arc-shaped extra length forming part, and has an extra length for branching and connecting. be.
本実施例において、ケーブル布設中の張力は抗張力体１
が支えるので、布設に際して光ファイバ心線２に形成し
である円弧状の余長形成部が伸ばされることはない。In this example, the tension during cable installation is
, so that the arc-shaped extra length forming portion formed on the optical fiber core 2 is not stretched during installation.
布設後の後分岐が必要となった場合には、ケニブルを必
要な箇所で切断し、内部の光ファイバ心線２を引出し、
円弧状の余長形成部を伸ばして直線状にすることにより
、接続に要する余長な得ることができる。If branching is required after installation, cut the cable at the required location, pull out the internal optical fiber core 2,
By extending the arcuate extra length forming portion to form a straight line, the extra length required for connection can be obtained.
第２図ａ ＋ ｂは本発明の分岐用平型光ファイバケー
ブルの他の実施例の構造を示す図で、第１図と同じ符号
は同じ部分を示す。本実施例は、光ファイバ心線２０余
長形成部を折り返し状に形成した例でおる。布設時の光
ファイバ心線の折り返し状形成部への張力の無影響、お
よび布設後の後分岐に際し・Ｃの作業工程は、第１図の
さぎの実施例の場合と同等でおり、詳述は省略する。FIGS. 2a and 2b are diagrams showing the structure of another embodiment of the branching flat optical fiber cable of the present invention, in which the same reference numerals as in FIG. 1 indicate the same parts. This embodiment is an example in which the extra length forming portion of the optical fiber coated wire 20 is formed in a folded shape. No influence of tension on the folded part of the optical fiber core during installation, and when branching after installation.The work process in C is the same as in the case of the rabbit embodiment shown in Figure 1, and will be described in detail. is omitted.
なお、上述の実施例のほかに、光ファイバ心線に形成す
る余長形成部のさらに他の例とし′Ｃ１図示による詳細
な説明は省略するが、正弦曲線状に形成したものも、さ
ぎの実施例と同等の作用、効果を有することは明らかで
、本発明の一態様に含゛まれる。In addition to the above-mentioned embodiments, there is another example of the extra length forming part formed in the optical fiber core, and although a detailed explanation is omitted using the illustration 'C1', one formed in a sinusoidal shape is also possible. It is clear that this embodiment has the same functions and effects as those of the embodiment, and is therefore included in one embodiment of the present invention.
具体例な次に説明する。第１図ａ、ｂに示した構造の、
光ファイバ心線の余長形成部が円弧状の光ファイバケー
ブルを試作した。径０．９１３φの光ファイバ心線に、
径１５１１φの円弧状の余長形成部を形成し゛Ｃ１鋼線
またはＦＲＰ等からなる径２ｉｏｉφの抗張力体を長径
端部に埋め込んだポリエテレンまたは塩化ビニルからな
る内長径１６鵡、内短径４謳の外被内に収納した。この
試作光ファイバケーブルＩＦＭ長に収納され°Ｃいる光
ファイバ心線は長：）さが約１．５７−であった。した
がって、この試作例では、１ｍ長の光ファイバケーブル
から引出した光ファイバ心線は約５７ ｔｘの余長が得
られる。A specific example will be explained next. The structure shown in Figures 1a and b,
We prototyped an optical fiber cable in which the extra length forming part of the optical fiber core was arc-shaped. For optical fiber core wire with a diameter of 0.913φ,
An arc-shaped extra length forming part with a diameter of 1511φ is formed, and a tensile strength member with a diameter of 2ioiφ made of C1 steel wire or FRP is embedded in the major diameter end. The inner long axis is 16 mm and the inner minor axis is 4 mm. It was stored inside the outer jacket. The length of the optical fiber core housed in this prototype optical fiber cable IFM length was about 1.57°C. Therefore, in this prototype example, the optical fiber core wire drawn out from the 1 m long optical fiber cable has an extra length of about 57 tx.
ま次第２図ａ、ｂに示した構造の、光ファイバ心線の余
長形成部が折り返し状の場合は、折り返しの長さに応じ
て余長の長さを相当自由に設定できる。In the structure shown in FIGS. 2a and 2b, when the extra length forming portion of the optical fiber core is folded, the length of the extra length can be set fairly freely depending on the length of the fold.
本発明は、光ファイバ心線に形成する余長形成部の形状
を使用する目的、場所などにより適宜選択的に適用でき
るので、接続・分岐の多様性を必要とする光ファイバケ
ーブルにおいて有効である。The present invention can be selectively applied depending on the purpose, location, etc. of the shape of the extra length forming part formed in the optical fiber core wire, and is therefore effective in optical fiber cables that require a variety of connections and branches. .
以上説明したように、本発明の分岐用光ファイバケーブ
ルは、抗張力体を埋め込んだ平型外被の中に、円弧状ま
たは正弦曲線状あるいは折り返し状の余長形成部を備え
走光ファイバ心線を１本または複数本収納し九檎造で６
ること〃為ら、ケーブル布設時の張力は抗張力体で支え
ることにより、光ファイバ心線の余長部を引伸ばすよう
な影響を与えず、布設後の再接続を必要とする後分岐を
行う場合には、必要な光ファイバ心線の接続余長な得る
ことができ、たとえば事務所内のアンダカーペット配線
などにおいて、接続すべき機器などの数１−配置が決ま
っているような場合の配線ケーブルに適用して有効であ
る。As explained above, the branching optical fiber cable of the present invention has an arcuate, sinusoidal, or folded extra length forming part in a flat jacket in which a tensile strength member is embedded, and a running optical fiber core. One or more bottles can be stored in Kugi-zukuri 6
Therefore, by supporting the tension during cable installation with a tensile strength member, it does not have the effect of stretching the excess length of the optical fiber core, and branching can be performed after the cable is laid, which requires reconnection. In some cases, it is possible to obtain the necessary extra length for connecting optical fiber core wires. For example, in under-carpet wiring in an office, wiring cables can be used when the number and arrangement of equipment to be connected is determined. It is effective when applied to
第１図ａ、ｂおよび第２図ａ、ｂはそれぞれ本発明の分
岐用平型光ファイバケーブルの実施例１および実施例２
の構造説明図である。１・・・抗張力体２・・・光ファイバ心線３・・・外被Fig. 1 a, b and Fig. 2 a, b show Example 1 and Example 2 of branching flat optical fiber cables of the present invention, respectively.
FIG. 1... Tensile strength body 2... Optical fiber core wire 3... Outer cover
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62034890AJPS63201611A (en) | 1987-02-18 | 1987-02-18 | Flat optical fiber cable for branching |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62034890AJPS63201611A (en) | 1987-02-18 | 1987-02-18 | Flat optical fiber cable for branching |
| Publication Number | Publication Date |
|---|---|
| JPS63201611Atrue JPS63201611A (en) | 1988-08-19 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62034890APendingJPS63201611A (en) | 1987-02-18 | 1987-02-18 | Flat optical fiber cable for branching |
| Country | Link |
|---|---|
| JP (1) | JPS63201611A (en) |
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| US7751666B2 (en) | 2002-12-19 | 2010-07-06 | Corning Cable Systems Llc | Optical tube assembly having a dry insert and methods of making the same |
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| KR920010324A (en) | Fiber optic cable | |
| JPS63201611A (en) | Flat optical fiber cable for branching | |
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| JPH0326572Y2 (en) | ||
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