WO2011136274A1 - Optical fiber cable - Google Patents

Optical fiber cable Download PDF

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Publication number
WO2011136274A1
WO2011136274A1 PCT/JP2011/060272 JP2011060272W WO2011136274A1 WO 2011136274 A1 WO2011136274 A1 WO 2011136274A1 JP 2011060272 W JP2011060272 W JP 2011060272W WO 2011136274 A1 WO2011136274 A1 WO 2011136274A1
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WO
WIPO (PCT)
Prior art keywords
optical fiber
cable
slot
axis
longitudinal direction
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PCT/JP2011/060272
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French (fr)
Japanese (ja)
Inventor
広二 齋藤
直樹 岡田
正義 山中
佳夫 橋本
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株式会社フジクラ
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Publication of WO2011136274A1 publication Critical patent/WO2011136274A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/4434—Central member to take up tensile loads
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/443—Protective covering
    • G02B6/4432—Protective covering with fibre reinforcements
    • G02B6/4433—Double reinforcement laying in straight line with optical transmission element

Definitions

  • the present invention includes an optical fiber communication line (the optical fiber communication line is a concept including an optical fiber core wire, a drop type optical fiber cable, an indoor type optical fiber cable, and the like).
  • the present invention relates to an optical fiber cable including a slot core and a sheath covering the periphery of the slot core.
  • Patent Document 1 discloses a slot core having a slot groove for accommodating an optical fiber therein, a sheath covering the periphery of the slot core, and a tensile body embedded in the slot core along the longitudinal direction of the cable.
  • An optical fiber cable is described.
  • the slot core is formed in a C-shaped cross section with one slot groove, and a tensile body is disposed inside the thick portion of the slot core.
  • the thickness of the sheath is set to be thicker on the opening side of the slot groove, and is set to be thinner on the side opposite to the opening.
  • FIG. 10 shows a structure of a conventional optical fiber cable similar to that described in Patent Document 1.
  • the optical fiber cable 110 includes a slot core 111 having a single slot groove 112 for accommodating a plurality of optical fibers 113 therein, and a sheath provided by extrusion afterward so as to cover the periphery of the slot core 111.
  • the two strength members 115 are arranged side by side on an axis passing through the center of the cable (the center of the cross section perpendicular to the longitudinal direction of the cable) and the center of the opening 116 of the slot groove 112 in the width direction.
  • the thickness of the sheath 114 is set to be thicker on the opening 116 side of the slot groove 112 and is set to be thinner on the side opposite to the opening 116. That is, the thick portion 114 a of the sheath 114 is disposed on the opening 116 side of the slot groove 112, and the thin portion 114 b is disposed on the opposite side of the opening 116 of the slot groove 112.
  • the opening 116 of the slot groove 112 of the slot core 111 is a pressing tape 117 such as a PET tape that prevents the molten resin constituting the sheath 114 from entering the slot groove 112 when the sheath 114 is extruded. Covered.
  • the above-described conventional optical fiber cable 110 has only one slot groove 112, and therefore, from among a plurality of optical fibers 113 housed in the same slot groove 112 for intermediate rear branching.
  • a specific optical fiber 113 is taken out, there is a high possibility that another optical fiber 113 that does not need to be taken out is taken out together or accidentally taken out. There is a possibility that the fiber 113 is excessively affected such as over tension.
  • the optical fiber core wires can be distinguished from each other by color coding such as blue, yellow, green, red, purple, and white.
  • color coding such as blue, yellow, green, red, purple, and white.
  • the present invention is an optical device capable of improving the discrimination when a specific optical fiber (optical fiber communication line) is taken out from a plurality of optical fibers (optical fiber communication lines) housed in the cable.
  • An object is to provide a fiber cable.
  • a slot core having a slot groove for accommodating an optical fiber communication line therein, a sheath covering the periphery of the slot core, and the slot core along the longitudinal direction of the cable.
  • an optical fiber cable provided with an embedded tensile strength body
  • one of the Y axes is a cable bending neutral
  • the two tension members are arranged in parallel to each other at a position on the Y axis inside the slot core and near the center of the cable so as to form a line, and both the slot grooves are arranged on the Y axis.
  • Two of the two slots are arranged at the upper position and at 180 degrees opposite to each other with the cable center in between, and these two slot grooves are located closer to the cable center than the tensile body.
  • a slot core having a slot groove for accommodating an optical fiber communication line therein, a sheath covering the periphery of the slot core, and the slot core along the longitudinal direction of the cable.
  • an optical fiber cable provided with an embedded tensile strength body
  • one of the Y axes is a cable bending neutral
  • the strip-shaped tension member is in a position in which the longitudinal direction of the cross section coincides with the Y axis at a position on the Y axis inside the slot core and close to the center of the cable so as to be a line.
  • One slot groove is disposed at two positions on the Y axis and opposite each other at 180 degrees across the center of the cable.
  • a straight groove extending in a straight line along the longitudinal direction of the cable is formed at a position farther from the cable center than the tensile strength member, and one slot groove and the other slot groove of these two slot grooves. Further, each of the optical fiber communication lines is housed.
  • the optical fiber cable of the present invention has two slot grooves, for example, if different types of optical fiber communication lines are accommodated in each slot groove, the type of the optical fiber communication line is identified for each slot groove. This makes it possible to improve the distinguishability and to easily take out the required optical fiber communication line.
  • a composite cable can be easily created by storing optical fiber communication lines having different structures in respective slot grooves.
  • the cable bending direction can be limitedly controlled so that the Y axis becomes a cable bending neutral line.
  • a problem distortion compression distortion
  • the tensile body is disposed closer to the center of the cable than the slot groove that stores the optical fiber communication line, the tensile body does not get in the way when the sheath is removed or the optical fiber communication line is taken out. Therefore, removal of the sheath and removal of the optical fiber communication line can be facilitated.
  • the optical fiber communication lines stored in the two slot grooves may be the same type or different types.
  • the difference in the color and the structure (type) of the optical fiber communication line is defined as a concept included in the difference in the type of the optical fiber communication line.
  • FIG. 1 is a transverse sectional view perpendicular to the longitudinal direction of the optical fiber cable according to the first embodiment of the present invention.
  • This optical fiber cable 10A includes a slot core 11 having two slot grooves 12a and 12b having an opening 16 on the outer peripheral surface, a sheath 14 covering the periphery of the slot core 11, and a cable inside the slot core 11.
  • Tensile body 15 composed of two filaments having a circular cross section embedded along the longitudinal direction, and two optical fiber cores of blue and red having different colors housed in the slot grooves 12 and 12b. (Optical fiber communication line).
  • the opening 16 of the slot groove 12 of the slot core 11 is covered with a pressing tape 17 such as a PET tape for preventing the molten resin constituting the sheath 14 from entering the slot groove 12 when the sheath 14 is extruded. ing.
  • the two strength members 15 are:
  • the X axis direction is the bending direction M
  • the Y axis is the neutral line of the cable bending direction M, so that they are spaced apart and parallel to each other on the Y axis inside the slot core 11 and close to the cable center O.
  • the two strength members 15 are arranged side by side.
  • the two strength members 15 are arranged at positions symmetrical with respect to the cable center O.
  • the two slot grooves 12a and 12b are both disposed on the Y axis and at positions facing each other by 180 degrees across the cable center O, and the width direction of the opening 16 of each slot groove 12a and 12b is set.
  • the center is located on the Y axis.
  • These two slot grooves 12 a and 12 b are disposed at positions farther from the cable center O than the two strength members 15.
  • the two slot grooves 12a and 12b are formed as straight grooves extending linearly along the cable longitudinal direction.
  • Each of the slot grooves 12 a and 12 b has a substantially semicircular cross section, and a portion corresponding to a semicircular chord is opened as an opening 16 on the outer peripheral surface of the slot core 11.
  • One of the two slot grooves 12a and 12b contains one blue optical fiber core wire 13a, and the other slot groove 12b contains, for example, one red fiber groove.
  • the optical fiber core wire 13b is accommodated.
  • the color combinations of the optical fiber cores 13a and 13b stored in the slot grooves 12a and 12b are arbitrary, and the colors of the optical fiber cores 13a and 13b stored in the slot grooves 12a and 12b are different from each other. That's fine.
  • the sheath 14 is peeled off by a predetermined area to open the openings 16 of the slot grooves 12a and 12b, and the necessary optical fiber cores 13a and 12b in the slot grooves 12a and 12b are opened. Remove only 13b.
  • the type of the optical fiber cores 13a and 13b is identified for each of the slot grooves 12a and 12b. Can be easily identified, and only the necessary optical fiber core wires 13a and 13b can be taken out without difficulty. Therefore, the optical fiber core wires 13a and 13b, which do not need to be taken out, are not adversely affected.
  • the outer surface of the sheath 14 facing the slot grooves 12a and 12b is different from the outside of the optical fiber cable 10A so that it can be seen which optical fiber core wires 13a and 13b are accommodated in which slot grooves 12a and 12b. It is desirable to provide a marker (provided in the longitudinal direction of the cable using a line of a different color as a mark). The point that it is desirable to provide a marker for identification is the same in the following embodiments.
  • the cable bending direction is set so that the Y axis becomes a cable bending neutral line. Limited control will be possible. As a result, it is possible to make it difficult for the optical fiber core wires 13a and 13b to be subjected to problematic strains (compression strain and elongation strain) when the cable is bent, and it is possible to ensure transmission characteristics. Further, since the bending direction is limited, the optical fiber cable 10A can be wound around a drum.
  • the two strength members 15 are disposed closer to the cable center O than the slot grooves 12a and 12b in which the optical fiber cores 13a and 13b are accommodated, the sheath 14 is removed or the optical fiber core wire is removed. At the time of taking out 13a and 13b, the tension member 15 does not get in the way, so that the sheath 14 can be removed and the optical fiber core wires 13a and 13b can be taken out easily.
  • FIG. 2 is a cross-sectional view perpendicular to the longitudinal direction of the optical fiber cable according to the second embodiment of the present invention.
  • this optical fiber cable 10B three optical fiber cores 13a, 13b, 13c and 13d, 13e, 13f are accommodated in the two slot grooves 12a, 12b, respectively.
  • One slot groove 12a accommodates three optical fiber core wires 13a, 13b, and 13c of blue, yellow, and green
  • the other slot groove 12b includes three optical fiber cores of red, purple, and white. Lines 13d, 13e, and 13f are accommodated. Since the other configuration is the same as that of the optical fiber cable 10A of the first embodiment shown in FIG. 1, the same components are denoted by the same reference numerals and description thereof is omitted.
  • optical fiber core wires 13a to 13f having different color combinations are accommodated in the two slot grooves 12a and 12b, the optical fiber core wires 13a to 13f are respectively provided to the slot grooves 12a and 12b. It is possible to identify the type of 13f (color distinction), it is easy to identify, and only necessary optical fiber core wires 13a to 13f can be taken out without difficulty. Accordingly, the optical fiber core wires 13a to 13f that do not need to be taken out are not affected excessively. Other functions and effects are the same as those of the first embodiment.
  • FIG. 3 is a transverse sectional view perpendicular to the longitudinal direction of the optical fiber cable according to the third embodiment of the present invention.
  • optical fibers having different types of structures are accommodated in the two slot grooves 12a and 12b, respectively.
  • a plurality of optical fiber ribbons 13g (optical fiber communication lines) are accommodated in one slot groove 12a, and a drop-type optical fiber cable 13h (optical fiber communication line) is accommodated in the other slot groove 12b. ing. Since the other configuration is the same as that of the optical fiber cable 10A of the first embodiment shown in FIG. 1, the same components are denoted by the same reference numerals and description thereof is omitted.
  • the two slot grooves 12a and 12b accommodate different types of optical fiber communication lines (optical fiber ribbon 13g and drop type optical fiber cable 13h). It is possible to identify the type of the optical fiber communication line for each of 12a and 12b, it becomes easy to identify, and only the necessary optical fiber communication line (the optical fiber ribbon 13g or the drop type optical fiber cable 13h) is taken out without difficulty. Will be able to. Therefore, the optical fiber communication line that does not need to be taken out is not adversely affected.
  • optical fiber communication lines having different structures are stored separately in the slot grooves 12a and 12b, a composite cable can be easily formed.
  • Other functions and effects are the same as those of the first embodiment.
  • FIG. 4 is a transverse sectional view perpendicular to the longitudinal direction of the optical fiber cable according to the fourth embodiment of the present invention.
  • This optical fiber cable 10D is provided with a single strip-shaped tensile body 25 instead of the two tensile bodies 15 of the optical fiber cable 10C of the third embodiment.
  • the tension member 25 is disposed at the cable center O in a posture in which the longitudinal direction of the cross section coincides with the Y axis so that the Y axis becomes a neutral line of the cable bending direction M.
  • the belt-like strength member 25 is disposed at the cable center O in a posture in which the longitudinal direction of the cross section coincides with the Y axis, so that one strength member 25 is used.
  • the cable bending direction M can be limited to the X-axis direction. Other functions and effects are the same as those of the third embodiment.
  • FIG. 5 is a transverse sectional view perpendicular to the longitudinal direction of the optical fiber cable according to the fifth embodiment of the present invention.
  • This optical fiber cable 10E is obtained by replacing the drop-type optical fiber cable 13h housed in one slot groove 12b of the optical fiber cable 10C of the third embodiment with an indoor-type optical fiber cable 13m.
  • the effect of the optical fiber cable 10E is the same as that of the third embodiment.
  • FIG. 6 is a cross-sectional view perpendicular to the longitudinal direction of the optical fiber cable shown as the first comparative example.
  • This optical fiber cable 10P corresponds to a modification of the conventional optical fiber cable 110 shown in FIG. 9, and the slot core 11 is provided with only one slot groove 12. And in this one slot groove
  • optical fiber cable 10P since the optical fiber tape core wire 13g and the indoor type optical fiber cable 13m are accommodated in one slot groove 12, when the optical fiber tape core wire 13g is taken out, the indoor type optical fiber cable 13g is taken together.
  • the optical fiber cable 13m may be pulled out.
  • the rigidity and expansion / contraction rate should be different for each type of optical fiber communication line, it is impossible to store them together in one slot groove 12, and it is actually difficult to combine in this form. I must say.
  • FIG. 7 is a cross-sectional view perpendicular to the cable longitudinal direction of an optical fiber cable shown as a second comparative example.
  • This optical fiber cable 10Q is a comparative example for the optical fiber cable 10E of the fifth embodiment shown in FIG.
  • the slot core 11 is provided with two slot grooves 12a and 12b, the slot grooves 12a and 12b are arranged in the direction in which the two strength members 15 are arranged, that is, the cable bending center line Y It is on the X axis, not on the axis.
  • the slot grooves 12a and 12b accommodate an optical fiber ribbon 13g and an indoor optical fiber cable 13m.
  • the cable bending direction M is limited to the X-axis direction due to the arrangement of the two strength members 15, so that the optical fiber communication line positioned outward from the cable bending center when the cable is bent.
  • the optical fiber communication line located on the inner side with respect to the cable bending center is more easily compressed. Therefore, the optical fiber communication line located inside is likely to receive a lot of compressive strain, and there is a possibility that transmission characteristics may not be ensured.
  • FIG. 8 is a cross-sectional view perpendicular to the cable longitudinal direction of an optical fiber cable shown as a third comparative example.
  • This optical fiber cable 10R is a comparative example for the optical fiber cable 10E of the fifth embodiment shown in FIG.
  • the two strength members 15 are not arranged at the center of the cross section of the slot core 11 as in the optical fiber cable 10E of FIG. 5, but on the outside in the cable radial direction of the slot grooves 12a and 12b. It is embedded in the sheath 14.
  • optical fiber communication line optical fiber
  • the strength member 15 becomes an obstacle, and it becomes difficult to take out the optical fiber communication line.
  • the optical fiber cable according to the embodiment of the present invention has the strength members 15 and 25 arranged so that the Y-axis is a cable bending neutral line, and is outside the strength member on the Y-axis. It is necessary that the two slot grooves 12a and 12b are disposed at positions that face the cable center O at 180 degrees, and that different types of optical fiber communication lines are accommodated in the respective slot grooves 12a and 12b. As a necessary condition, the following effects can be achieved while avoiding problems in the comparative example.
  • the bending direction of the cable can be limited, and transmission characteristics can be secured when the cable is bent.
  • FIG. 9 is a cross-sectional view perpendicular to the longitudinal direction of the optical fiber cable according to the sixth embodiment of the present invention.
  • This optical fiber cable 10F is an optical fiber cable in which the slot core 11 and the sheath 14 are both rectangular, unlike the first to fifth embodiments.
  • the same components as those of the optical fiber cable having the circular cross section of the first to fifth embodiments are denoted by the same reference numerals, and the description thereof is omitted.
  • the two strength members 15 are arranged in parallel and spaced apart from each other at a position on the Y axis of the rectangular slot core 11 and close to the cable center O. It is arranged.
  • the two slot grooves 12a and 12b are both arranged on the Y-axis and at positions facing each other by 180 degrees with the cable center O in between, and the width direction of the opening 16 of each slot groove 12a and 12b is set.
  • the center is located on the Y axis.
  • These two slot grooves 12 a and 12 b are disposed at positions farther from the cable center O than the two strength members 15.
  • the two slot grooves 12a and 12b are formed as straight grooves extending linearly along the cable longitudinal direction.
  • a pressing tape 17 is provided between the slot core 11 and the sheath 14 so as to cover the entire slot core 11 so that the molten resin constituting the sheath 14 does not enter the slot grooves 12a and 12b. Yes.
  • the sheath 14 is provided with a notch 18 formed in a V-groove for facilitating the tearing of a partial region of the sheath 14 when the middle branch is made.
  • the notch 18 is provided at one place on the X axis on the left and right sides, and is formed continuously in the cable longitudinal direction.
  • optical fiber cable 10F four optical fiber core wires 13a, 13b, 13c, 13d and 13e, 13f, 13g, 13h are accommodated in the two slot grooves 12a, 12b, respectively.
  • One slot groove 12a accommodates four optical fiber core wires 13a, 13b, 13c and 13d of blue, yellow, green and red, and the other slot groove 12b contains brown, purple, white and gray.
  • Four optical fiber core wires 13e, 13f, 13g, and 13h are accommodated.
  • the optical fiber core wires 13a to 13h having different color combinations are accommodated in the two slot grooves 12a and 12b, respectively. It is possible to identify the type of 13h (color distinction), it becomes easy to identify, and only the necessary optical fiber core wires 13a to 13h can be taken out without difficulty. Accordingly, the optical fiber core wires 13a to 13h that do not need to be taken out are not adversely affected.
  • optical fibers having different types of structures are accommodated in the two slot grooves 12a and 12b, respectively. Also good.
  • the present invention can be used for an optical fiber cable suitable for taking out an optical fiber housed in a slot core by cutting a sheath.

Abstract

Disclosed is an optical fiber cable which includes a slot core (11) with two slot grooves (12a, 12b) provided therein to accommodate optical fiber cores (optical fiber communication lines) (13a, 13b); a sheath (14) for covering the periphery of the slot core; and two tension-resistant components (15) embedded inside the slot core. The two tension-resistant components (15) are disposed on the Y-axis that passes through the center of the cable (O), and the slot grooves (12a, 12b) are located on the Y-axis so as to sandwich the tension-resistant components (15) therebetween. The two slot grooves are formed as a straight groove that extends in a straight line in the longitudinal direction of the cable. One of the slot grooves (12a) and the other slot groove (12b) accommodate, for example, the optical fiber cores (13a, 13b) of different colors, respectively.

Description

光ファイバケーブルFiber optic cable
　本発明は、光ファイバ通信線（光ファイバ通信線は、光ファイバ心線、ドロップ型の光ファイバケーブル、インドア型の光ファイバケーブル等を含む概念である）を内部に収納するスロット溝を備えたスロットコアと、このスロットコアの周囲を被覆するシースと、を備えた光ファイバケーブルに関するものである。 The present invention includes an optical fiber communication line (the optical fiber communication line is a concept including an optical fiber core wire, a drop type optical fiber cable, an indoor type optical fiber cable, and the like). The present invention relates to an optical fiber cable including a slot core and a sheath covering the periphery of the slot core.
　特許文献１に、光ファイバを内部に収納するスロット溝を備えたスロットコアと、このスロットコアの周囲を被覆するシースと、前記スロットコアの内部にケーブル長手方向に沿って埋設された抗張力体と、を備えた光ファイバケーブルが記載されている。この光ファイバケーブルでは、スロットコアが、１つのスロット溝を備えた断面Ｃ字状に形成され、スロットコアの肉厚部の内部に抗張力体が配設されている。また、シースの肉厚がスロット溝の開口部側で厚くなるように設定されると共に、開口部と反対側で薄くなるように設定されている。 Patent Document 1 discloses a slot core having a slot groove for accommodating an optical fiber therein, a sheath covering the periphery of the slot core, and a tensile body embedded in the slot core along the longitudinal direction of the cable. , An optical fiber cable is described. In this optical fiber cable, the slot core is formed in a C-shaped cross section with one slot groove, and a tensile body is disposed inside the thick portion of the slot core. In addition, the thickness of the sheath is set to be thicker on the opening side of the slot groove, and is set to be thinner on the side opposite to the opening.
　図１０は、特許文献１に記載のものと類似の従来の光ファイバケーブルの構造を示している。 FIG. 10 shows a structure of a conventional optical fiber cable similar to that described in Patent Document 1.
　この光ファイバケーブル１１０は、複数の光ファイバ１１３を内部に収納する１つのスロット溝１１２を備えたスロットコア１１１と、このスロットコア１１１の周囲を被覆するように後から押し出し成形により設けられたシース１１４と、スロットコア１１１の内部にケーブル長手方向に沿って埋設された２本の抗張力体１１５と、を備えている。２本の抗張力体１１５は、ケーブル中心（ケーブルの長手方向と垂直な断面上の中心）とスロット溝１１２の開口部１１６の幅方向中央を通る軸上に並べて配置されている。 The optical fiber cable 110 includes a slot core 111 having a single slot groove 112 for accommodating a plurality of optical fibers 113 therein, and a sheath provided by extrusion afterward so as to cover the periphery of the slot core 111. 114 and two strength members 115 embedded in the slot core 111 along the longitudinal direction of the cable. The two strength members 115 are arranged side by side on an axis passing through the center of the cable (the center of the cross section perpendicular to the longitudinal direction of the cable) and the center of the opening 116 of the slot groove 112 in the width direction.
　シース１１４の肉厚は、スロット溝１１２の開口部１１６側で厚くなるように設定されると共に、開口部１１６と反対側で薄くなるように設定されている。つまり、シース１１４の厚肉部１１４ａがスロット溝１１２の開口部１１６側に配置され、薄肉部１１４ｂがスロット溝１１２の開口部１１６と反対側に配置されている。 The thickness of the sheath 114 is set to be thicker on the opening 116 side of the slot groove 112 and is set to be thinner on the side opposite to the opening 116. That is, the thick portion 114 a of the sheath 114 is disposed on the opening 116 side of the slot groove 112, and the thin portion 114 b is disposed on the opposite side of the opening 116 of the slot groove 112.
　また、スロットコア１１１のスロット溝１１２の開口部１１６は、シース１１４の押し出し成形時に、シース１１４を構成する溶融樹脂がスロット溝１１２内に入らないようにするためのＰＥＴテープ等の押さえテープ１１７で覆われている。 The opening 116 of the slot groove 112 of the slot core 111 is a pressing tape 117 such as a PET tape that prevents the molten resin constituting the sheath 114 from entering the slot groove 112 when the sheath 114 is extruded. Covered.
特開２００８－７６８９７号公報（図７）Japanese Patent Laying-Open No. 2008-76897 (FIG. 7)
　ところで、上述した従来の光ファイバケーブル１１０は、スロット溝１１２を１つしか有していないので、中間後分岐のために、同一スロット溝１１２内に収納された複数本の光ファイバ１１３の中から特定の光ファイバ１１３を外に取り出すような場合に、取り出す必要のない他の光ファイバ１１３を一緒に外に取り出したり、間違って外に取り出してしまったりするおそれが高く、その結果、他の光ファイバ１１３に過張力等の余計な影響を与えるおそれがあった。 By the way, the above-described conventional optical fiber cable 110 has only one slot groove 112, and therefore, from among a plurality of optical fibers 113 housed in the same slot groove 112 for intermediate rear branching. When a specific optical fiber 113 is taken out, there is a high possibility that another optical fiber 113 that does not need to be taken out is taken out together or accidentally taken out. There is a possibility that the fiber 113 is excessively affected such as over tension.
　例えば、光ファイバ１１３として複数の光ファイバ心線をスロット溝１１２の内部に収納している場合、光ファイバ心線は青、黄、緑、赤、紫、白等の色分けにより互いに識別できるようにされているが、暗いところで作業した場合は、色を区別しにくいために、関係のない光ファイバ心線を外に取り出してしまうことがある。 For example, when a plurality of optical fiber cores are housed in the slot groove 112 as the optical fiber 113, the optical fiber core wires can be distinguished from each other by color coding such as blue, yellow, green, red, purple, and white. However, when working in a dark place, it is difficult to distinguish the colors, so an unrelated optical fiber core may be taken out.
　そこで、本発明は、ケーブル内部に収納してある複数の光ファイバ（光ファイバ通信線）の中から特定の光ファイバ（光ファイバ通信線）を取り出す際の識別性の向上を図る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 is an optical device capable of improving the discrimination when a specific optical fiber (optical fiber communication line) is taken out from a plurality of optical fibers (optical fiber communication lines) housed in the cable. An object is to provide a fiber cable.
　請求項１に記載の発明は、光ファイバ通信線を内部に収納するスロット溝を備えたスロットコアと、このスロットコアの周囲を被覆するシースと、前記スロットコアの内部にケーブル長手方向に沿って埋設された抗張力体と、を備えた光ファイバケーブルにおいて、ケーブル長手方向に垂直な断面においてケーブル中心を通り互いに直交する方向をＸ軸とＹ軸としたとき、一方の前記Ｙ軸がケーブル曲げ中立線となるように、前記スロットコアの内部の前記Ｙ軸上の位置で且つケーブル中心に近い位置に２本の前記抗張力体が互いに平行に並べて配設され、前記スロット溝が、共に前記Ｙ軸上の位置で且つ前記ケーブル中心を挟んで１８０度対向する位置に２つ配設され、これら２つのスロット溝は、前記抗張力体よりもケーブル中心から遠い位置に配設され、しかも、ケーブル長手方向に沿って直線状に延びるストレート溝として形成され、これら２つのスロット溝のうちの一方のスロット溝と他方のスロット溝に、光ファイバ通信線がそれぞれ収納されていることを特徴としている。 According to a first aspect of the present invention, there is provided a slot core having a slot groove for accommodating an optical fiber communication line therein, a sheath covering the periphery of the slot core, and the slot core along the longitudinal direction of the cable. In an optical fiber cable provided with an embedded tensile strength body, when the directions perpendicular to each other through the cable center in a cross section perpendicular to the longitudinal direction of the cable are defined as the X axis and the Y axis, one of the Y axes is a cable bending neutral The two tension members are arranged in parallel to each other at a position on the Y axis inside the slot core and near the center of the cable so as to form a line, and both the slot grooves are arranged on the Y axis. Two of the two slots are arranged at the upper position and at 180 degrees opposite to each other with the cable center in between, and these two slot grooves are located closer to the cable center than the tensile body. Are formed as straight grooves extending in the longitudinal direction of the cable, and optical fiber communication lines are respectively formed in one of the two slot grooves and the other slot groove. It is characterized by being housed.
　請求項２に記載の発明は、光ファイバ通信線を内部に収納するスロット溝を備えたスロットコアと、このスロットコアの周囲を被覆するシースと、前記スロットコアの内部にケーブル長手方向に沿って埋設された抗張力体と、を備えた光ファイバケーブルにおいて、ケーブル長手方向に垂直な断面においてケーブル中心を通り互いに直交する方向をＸ軸とＹ軸としたとき、一方の前記Ｙ軸がケーブル曲げ中立線となるように、前記スロットコアの内部の前記Ｙ軸上の位置で且つケーブル中心に近い位置に、断面の長手方向を前記Ｙ軸上に一致させた姿勢で帯板状の前記抗張力体が１本配設され、前記スロット溝が、共に前記Ｙ軸上の位置で且つ前記ケーブル中心を挟んで１８０度対向する位置に２つ配設され、これら２つのスロット溝は、前記抗張力体よりもケーブル中心から遠い位置に配設され、しかも、ケーブル長手方向に沿って直線状に延びるストレート溝として形成され、これら２つのスロット溝のうちの一方のスロット溝と他方のスロット溝に、光ファイバ通信線がそれぞれ収納されていることを特徴としている。 According to a second aspect of the present invention, there is provided a slot core having a slot groove for accommodating an optical fiber communication line therein, a sheath covering the periphery of the slot core, and the slot core along the longitudinal direction of the cable. In an optical fiber cable provided with an embedded tensile strength body, when the directions perpendicular to each other through the cable center in a cross section perpendicular to the longitudinal direction of the cable are defined as the X axis and the Y axis, one of the Y axes is a cable bending neutral The strip-shaped tension member is in a position in which the longitudinal direction of the cross section coincides with the Y axis at a position on the Y axis inside the slot core and close to the center of the cable so as to be a line. One slot groove is disposed at two positions on the Y axis and opposite each other at 180 degrees across the center of the cable. A straight groove extending in a straight line along the longitudinal direction of the cable is formed at a position farther from the cable center than the tensile strength member, and one slot groove and the other slot groove of these two slot grooves. Further, each of the optical fiber communication lines is housed.
　本発明の光ファイバケーブルによれば、２つのスロット溝を有しているので、例えば各スロット溝に種類の異なる光ファイバ通信線を収納すれば、スロット溝ごとに光ファイバ通信線の種類の識別が可能となり、識別性の向上が図れて、必要な光ファイバ通信線が取り出しやすくなる。 Since the optical fiber cable of the present invention has two slot grooves, for example, if different types of optical fiber communication lines are accommodated in each slot groove, the type of the optical fiber communication line is identified for each slot groove. This makes it possible to improve the distinguishability and to easily take out the required optical fiber communication line.
　また、例えば、異なる構造の光ファイバ通信線を各スロット溝に分けて収納することで、容易に複合ケーブルを作成することが可能となる。 Also, for example, a composite cable can be easily created by storing optical fiber communication lines having different structures in respective slot grooves.
　また、２本の抗張力体をＹ軸上に配置し、あるいは、断面の長手方向をＹ軸に一致させた姿勢で帯板状の抗張力体をＹ軸上に配置し、且つ、２つのスロット溝をもＹ軸上に配置しているので、ケーブル曲げ方向を、Ｙ軸がケーブル曲げ中立線となるように限定制御できるようになる。その結果、ケーブル曲げ時に光ファイバ通信線に、問題となる歪み（圧縮歪み）が加わり難くすることができ、伝送特性の確保が可能となる。また、ケーブル曲げ方向が限定されるので、ドラムにケーブルを巻き取ることも可能になる。 In addition, two strength members are disposed on the Y axis, or a strip-shaped strength member is disposed on the Y axis in a posture in which the longitudinal direction of the cross section coincides with the Y axis, and two slot grooves Are arranged on the Y axis, the cable bending direction can be limitedly controlled so that the Y axis becomes a cable bending neutral line. As a result, it is possible to make it difficult to apply a problem distortion (compression distortion) to the optical fiber communication line when the cable is bent, and it is possible to ensure transmission characteristics. Moreover, since the cable bending direction is limited, it is possible to wind the cable around the drum.
　また、抗張力体が、光ファイバ通信線を収納したスロット溝よりもケーブル中心に近い位置に配置されているので、シースの除去時や光ファイバ通信線の取り出し時に、抗張力体が邪魔にならず、従ってシースの除去や光ファイバ通信線の取り出しが容易にできる。 In addition, since the tensile body is disposed closer to the center of the cable than the slot groove that stores the optical fiber communication line, the tensile body does not get in the way when the sheath is removed or the optical fiber communication line is taken out. Therefore, removal of the sheath and removal of the optical fiber communication line can be facilitated.
本発明の第１実施形態の光ファイバケーブルのケーブル長手方向に垂直な横断面図である。It is a transverse cross section perpendicular to the cable longitudinal direction of the optical fiber cable of a 1st embodiment of the present invention. 本発明の第２実施形態の光ファイバケーブルのケーブル長手方向に垂直な横断面図である。It is a cross-sectional view perpendicular to the cable longitudinal direction of the optical fiber cable of the second embodiment of the present invention. 本発明の第３実施形態の光ファイバケーブルのケーブル長手方向に垂直な横断面図である。It is a cross-sectional view perpendicular to the cable longitudinal direction of the optical fiber cable of the third embodiment of the present invention. 本発明の第４実施形態の光ファイバケーブルのケーブル長手方向に垂直な横断面図である。It is a cross-sectional view perpendicular to the cable longitudinal direction of the optical fiber cable of the fourth embodiment of the present invention. 本発明の第５実施形態の光ファイバケーブルのケーブル長手方向に垂直な横断面図である。It is a cross-sectional view perpendicular to the cable longitudinal direction of the optical fiber cable of the fifth embodiment of the present invention. 第１の比較例として示す光ファイバケーブルのケーブル長手方向に垂直な横断面図である。It is a cross-sectional view perpendicular to the cable longitudinal direction of an optical fiber cable shown as a first comparative example. 第２の比較例として示す光ファイバケーブルのケーブル長手方向に垂直な横断面図である。It is a cross-sectional view perpendicular to the cable longitudinal direction of an optical fiber cable shown as a second comparative example. 第３の比較例として示す光ファイバケーブルのケーブル長手方向に垂直な横断面図である。It is a cross-sectional view perpendicular to the cable longitudinal direction of an optical fiber cable shown as a third comparative example. 本発明の第６実施形態の光ファイバケーブルのケーブル長手方向に垂直な横断面図である。It is a cross-sectional view perpendicular to the cable longitudinal direction of the optical fiber cable of the sixth embodiment of the present invention. 従来例の光ファイバケーブルのケーブル長手方向に垂直な横断面図である。It is a cross-sectional view perpendicular to the cable longitudinal direction of a conventional optical fiber cable.
　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。 Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.
　本発明では、２つのスロット溝に収納する光ファイバ通信線は、同一種類のもの或いは異なる種類のものの何れでもよい。本明細書では、光ファイバ通信線の色の違いや構造（タイプ）の違いを、光ファイバ通信線の種類の違いに含む概念と定義する。 In the present invention, the optical fiber communication lines stored in the two slot grooves may be the same type or different types. In this specification, the difference in the color and the structure (type) of the optical fiber communication line is defined as a concept included in the difference in the type of the optical fiber communication line.
　「第１実施形態」
　図１は本発明の第１実施形態の光ファイバケーブルのケーブル長手方向に垂直な横断面図である。 “First Embodiment”
FIG. 1 is a transverse sectional view perpendicular to the longitudinal direction of the optical fiber cable according to the first embodiment of the present invention.
　この光ファイバケーブル１０Ａは、外周面に開口部１６を持つ２つのスロット溝１２ａ、１２ｂを備えたスロットコア１１と、このスロットコア１１の周囲を被覆するシース１４と、スロットコア１１の内部にケーブル長手方向に沿って埋設された２本の断面円形の線条よりなる抗張力体１５と、各スロット溝１２、１２ｂの内部に収納された互いに色の異なる青色と赤色の２本の光ファイバ心線（光ファイバ通信線）とから構成されている。スロットコア１１のスロット溝１２の開口部１６は、シース１４の押し出し成形時に、シース１４を構成する溶融樹脂がスロット溝１２内に入らないようにするためのＰＥＴテープ等の押さえテープ１７で覆われている。 This optical fiber cable 10A includes a slot core 11 having two slot grooves 12a and 12b having an opening 16 on the outer peripheral surface, a sheath 14 covering the periphery of the slot core 11, and a cable inside the slot core 11. Tensile body 15 composed of two filaments having a circular cross section embedded along the longitudinal direction, and two optical fiber cores of blue and red having different colors housed in the slot grooves 12 and 12b. (Optical fiber communication line). The opening 16 of the slot groove 12 of the slot core 11 is covered with a pressing tape 17 such as a PET tape for preventing the molten resin constituting the sheath 14 from entering the slot groove 12 when the sheath 14 is extruded. ing.
　ここで、ケーブル長手方向に垂直な断面において、ケーブル中心Ｏを通る互いに直交する方向をＸ軸（図中横方向）とＹ軸（図中縦方向）とすると、２本の抗張力体１５は、Ｘ軸方向が曲げ方向Ｍとなり、Ｙ軸がケーブル曲げ方向Ｍの中立線となるように、スロットコア１１の内部のＹ軸上の位置で且つケーブル中心Ｏに近い位置に、互いに離間して平行に並べて配設されている。特に、ケーブル中心Ｏに対して対称となる位置に２つの抗張力体１５が配設されている。 Here, in the cross section perpendicular to the longitudinal direction of the cable, when the directions perpendicular to each other passing through the cable center O are the X axis (lateral direction in the figure) and the Y axis (vertical direction in the figure), the two strength members 15 are: The X axis direction is the bending direction M, and the Y axis is the neutral line of the cable bending direction M, so that they are spaced apart and parallel to each other on the Y axis inside the slot core 11 and close to the cable center O. Are arranged side by side. In particular, the two strength members 15 are arranged at positions symmetrical with respect to the cable center O.
　また、２つのスロット溝１２ａ、１２ｂは、共にＹ軸上の位置で且つケーブル中心Ｏを挟んで１８０度対向する位置に配設されおり、各スロット溝１２ａ、１２ｂの開口部１６の幅方向の中央がＹ軸上に位置している。これら２つのスロット溝１２ａ、１２ｂは、２本の抗張力体１５よりもケーブル中心Ｏから遠い位置に配設されている。しかも、２つのスロット溝１２ａ、１２ｂは、ケーブル長手方向に沿って直線状に延びるストレート溝として形成されている。各スロット溝１２ａ、１２ｂは、断面略半円形状のもので、スロットコア１１の外周面に、半円の弦に相当する部分が開口部１６として開口している。 The two slot grooves 12a and 12b are both disposed on the Y axis and at positions facing each other by 180 degrees across the cable center O, and the width direction of the opening 16 of each slot groove 12a and 12b is set. The center is located on the Y axis. These two slot grooves 12 a and 12 b are disposed at positions farther from the cable center O than the two strength members 15. Moreover, the two slot grooves 12a and 12b are formed as straight grooves extending linearly along the cable longitudinal direction. Each of the slot grooves 12 a and 12 b has a substantially semicircular cross section, and a portion corresponding to a semicircular chord is opened as an opening 16 on the outer peripheral surface of the slot core 11.
　そして、これら２つのスロット溝１２ａ、１２ｂのうちの一方のスロット溝１２ａに、例えば、青色の１本の光ファイバ心線１３ａが収納され、他方のスロット溝１２ｂに、例えば、赤色の１本の光ファイバ心線１３ｂが収納されている。なお、各スロット溝１２ａ、１２ｂに収納する光ファイバ心線１３ａ、１３ｂの色の組み合わせは任意であり、両スロット溝１２ａ、１２ｂに収納する光ファイバ心線１３ａ、１３ｂの色が互いに異なっていればよい。 One of the two slot grooves 12a and 12b, for example, contains one blue optical fiber core wire 13a, and the other slot groove 12b contains, for example, one red fiber groove. The optical fiber core wire 13b is accommodated. The color combinations of the optical fiber cores 13a and 13b stored in the slot grooves 12a and 12b are arbitrary, and the colors of the optical fiber cores 13a and 13b stored in the slot grooves 12a and 12b are different from each other. That's fine.
　このような構造の光ファイバケーブル１０Ａを使用している状況において、中間後分岐作業のために、２本の光ファイバ心線１３ａ、１３ｂのうちのいずれか一方の光ファイバ心線１３ａ、１３ｂだけの口出しが必要になった場合、まず、シース１４を所定領域だけ引き剥がして、スロット溝１２ａ、１２ｂの開口部１６を開放し、スロット溝１２ａ、１２ｂの中の必要な光ファイバ心線１３ａ、１３ｂだけを取り出す。 In a situation where the optical fiber cable 10A having such a structure is used, only one of the two optical fiber cores 13a and 13b is used for the intermediate post branching operation. First, the sheath 14 is peeled off by a predetermined area to open the openings 16 of the slot grooves 12a and 12b, and the necessary optical fiber cores 13a and 12b in the slot grooves 12a and 12b are opened. Remove only 13b.
　その際、２つのスロット溝１２ａ、１２ｂにそれぞれ色の異なる光ファイバ心線１３ａ、１３ｂを収納しているので、スロット溝１２ａ、１２ｂごとに光ファイバ心線１３ａ、１３ｂの種類の識別（色の区別）が可能であり、識別しやすくなり、必要な光ファイバ心線１３ａ、１３ｂだけを無理なく取り出すことができるようになる。従って、取り出す必要のない光ファイバ心線１３ａ、１３ｂに余計な影響を与えずにすむ。 At this time, since the optical fiber cores 13a and 13b having different colors are accommodated in the two slot grooves 12a and 12b, the type of the optical fiber cores 13a and 13b is identified for each of the slot grooves 12a and 12b. Can be easily identified, and only the necessary optical fiber core wires 13a and 13b can be taken out without difficulty. Therefore, the optical fiber core wires 13a and 13b, which do not need to be taken out, are not adversely affected.
　なお、光ファイバケーブル１０Ａの外からどちらのスロット溝１２ａ、１２ｂにどちらの光ファイバ心線１３ａ、１３ｂが収納されているか判るように、スロット溝１２ａ、１２ｂと対向するシース１４の外表面に異なるマーカを設けておく（色違いの線を目印としてケーブル長手方向に設けておく）ことが望ましい。識別用のマーカを設けるのが望ましい点は、以下の各実施形態においても同様である。 It should be noted that the outer surface of the sheath 14 facing the slot grooves 12a and 12b is different from the outside of the optical fiber cable 10A so that it can be seen which optical fiber core wires 13a and 13b are accommodated in which slot grooves 12a and 12b. It is desirable to provide a marker (provided in the longitudinal direction of the cable using a line of a different color as a mark). The point that it is desirable to provide a marker for identification is the same in the following embodiments.
　また、２本の抗張力体１５をＹ軸上に並べて配置し、且つ、２つのスロット溝１２もＹ軸上に配置しているので、ケーブル曲げ方向を、Ｙ軸がケーブル曲げ中立線となるように限定制御できるようになる。その結果、ケーブル曲げ時に光ファイバ心線１３ａ、１３ｂに、問題となる歪み（圧縮歪みおよび伸び歪み）が加わり難くすることができ、伝送特性の確保が可能となる。また、曲げ方向が限定されるので、光ファイバケーブル１０Ａをドラムに巻き取ることも可能になる。 Further, since the two strength members 15 are arranged side by side on the Y axis and the two slot grooves 12 are also arranged on the Y axis, the cable bending direction is set so that the Y axis becomes a cable bending neutral line. Limited control will be possible. As a result, it is possible to make it difficult for the optical fiber core wires 13a and 13b to be subjected to problematic strains (compression strain and elongation strain) when the cable is bent, and it is possible to ensure transmission characteristics. Further, since the bending direction is limited, the optical fiber cable 10A can be wound around a drum.
　また、２本の抗張力体１５が、光ファイバ心線１３ａ、１３ｂを収納したスロット溝１２ａ、１２ｂよりもケーブル中心Ｏに近い位置に配置されているので、シース１４の除去時や光ファイバ心線１３ａ、１３ｂの取り出し時に、抗張力体１５が邪魔になることがなく、従ってシース１４の除去や光ファイバ心線１３ａ、１３ｂの取り出しが容易にできることになる。 Further, since the two strength members 15 are disposed closer to the cable center O than the slot grooves 12a and 12b in which the optical fiber cores 13a and 13b are accommodated, the sheath 14 is removed or the optical fiber core wire is removed. At the time of taking out 13a and 13b, the tension member 15 does not get in the way, so that the sheath 14 can be removed and the optical fiber core wires 13a and 13b can be taken out easily.
　「第２実施形態」
　図２は本発明の第２実施形態の光ファイバケーブルのケーブル長手方向に垂直な横断面図である。 “Second Embodiment”
FIG. 2 is a cross-sectional view perpendicular to the longitudinal direction of the optical fiber cable according to the second embodiment of the present invention.
　この光ファイバケーブル１０Ｂでは、２つのスロット溝１２ａ、１２ｂに、それぞれ３本ずつの光ファイバ心線１３ａ、１３ｂ、１３ｃ及び１３ｄ、１３ｅ、１３ｆが収納されている。一方のスロット溝１２ａには、青、黄、緑の３本の光ファイバ心線１３ａ、１３ｂ、１３ｃが収納され、他方のスロット溝１２ｂには、赤、紫、白の３本の光ファイバ心線１３ｄ、１３ｅ、１３ｆが収納されている。それ以外の構成は、図１に示した第１実施形態の光ファイバケーブル１０Ａと同じであるので、同一構成部品には同一符号を付してその説明は省略する。 In this optical fiber cable 10B, three optical fiber cores 13a, 13b, 13c and 13d, 13e, 13f are accommodated in the two slot grooves 12a, 12b, respectively. One slot groove 12a accommodates three optical fiber core wires 13a, 13b, and 13c of blue, yellow, and green, and the other slot groove 12b includes three optical fiber cores of red, purple, and white. Lines 13d, 13e, and 13f are accommodated. Since the other configuration is the same as that of the optical fiber cable 10A of the first embodiment shown in FIG. 1, the same components are denoted by the same reference numerals and description thereof is omitted.
　この光ファイバケーブル１０Ｂによれば、２つのスロット溝１２ａ、１２ｂにそれぞれ色の組み合わせの異なる光ファイバ心線１３ａ～１３ｆを収納しているので、スロット溝１２ａ、１２ｂごとに光ファイバ心線１３ａ～１３ｆの種類の識別（色の区別）が可能であり、識別しやすくなり、必要な光ファイバ心線１３ａ～１３ｆだけを無理なく取り出すことができるようになる。従って、取り出す必要のない光ファイバ心線１３ａ～１３ｆに余計な影響を与えずにすむ。その他の作用効果は、第１実施形態と同様である。 According to this optical fiber cable 10B, since the optical fiber core wires 13a to 13f having different color combinations are accommodated in the two slot grooves 12a and 12b, the optical fiber core wires 13a to 13f are respectively provided to the slot grooves 12a and 12b. It is possible to identify the type of 13f (color distinction), it is easy to identify, and only necessary optical fiber core wires 13a to 13f can be taken out without difficulty. Accordingly, the optical fiber core wires 13a to 13f that do not need to be taken out are not affected excessively. Other functions and effects are the same as those of the first embodiment.
　「第３実施形態」
　図３は本発明の第３実施形態の光ファイバケーブルのケーブル長手方向に垂直な横断面図である。 “Third Embodiment”
FIG. 3 is a transverse sectional view perpendicular to the longitudinal direction of the optical fiber cable according to the third embodiment of the present invention.
　この光ファイバケーブル１０Ｃでは、２つのスロット溝１２ａ、１２ｂに、それぞれ構造（種類）のタイプの異なる光ファイバが収納されている。一方のスロット溝１２ａには、複数の光ファイバテープ心線１３ｇ（光ファイバ通信線）が収納され、他方のスロット溝１２ｂには、ドロップ型の光ファイバケーブル１３ｈ（光ファイバ通信線）が収納されている。それ以外の構成は、図１に示した第１実施形態の光ファイバケーブル１０Ａと同じであるので、同一構成部品には同一符号を付してその説明は省略する。 In this optical fiber cable 10C, optical fibers having different types of structures (kinds) are accommodated in the two slot grooves 12a and 12b, respectively. A plurality of optical fiber ribbons 13g (optical fiber communication lines) are accommodated in one slot groove 12a, and a drop-type optical fiber cable 13h (optical fiber communication line) is accommodated in the other slot groove 12b. ing. Since the other configuration is the same as that of the optical fiber cable 10A of the first embodiment shown in FIG. 1, the same components are denoted by the same reference numerals and description thereof is omitted.
　この光ファイバケーブル１０Ｃによれば、２つのスロット溝１２ａ、１２ｂにそれぞれタイプの異なる光ファイバ通信線（光ファイバテープ心線１３ｇとドロップ型の光ファイバケーブル１３ｈ）を収納しているので、スロット溝１２ａ、１２ｂごとに光ファイバ通信線の種類の識別が可能であり、識別しやすくなり、必要な光ファイバ通信線（光ファイバテープ心線１３ｇまたはドロップ型の光ファイバケーブル１３ｈ）だけを無理なく取り出すことができるようになる。従って、取り出す必要のない光ファイバ通信線に余計な影響を与えずにすむ。 According to this optical fiber cable 10C, the two slot grooves 12a and 12b accommodate different types of optical fiber communication lines (optical fiber ribbon 13g and drop type optical fiber cable 13h). It is possible to identify the type of the optical fiber communication line for each of 12a and 12b, it becomes easy to identify, and only the necessary optical fiber communication line (the optical fiber ribbon 13g or the drop type optical fiber cable 13h) is taken out without difficulty. Will be able to. Therefore, the optical fiber communication line that does not need to be taken out is not adversely affected.
　また、異なる構造の光ファイバ通信線を各スロット溝１２ａ、１２ｂに分けて収納しているので、容易に複合ケーブル化することができる。その他の作用効果は、第１実施形態と同様である。 Further, since the optical fiber communication lines having different structures are stored separately in the slot grooves 12a and 12b, a composite cable can be easily formed. Other functions and effects are the same as those of the first embodiment.
　「第４実施形態」
　図４は本発明の第４実施形態の光ファイバケーブルのケーブル長手方向に垂直な横断面図である。 “Fourth Embodiment”
FIG. 4 is a transverse sectional view perpendicular to the longitudinal direction of the optical fiber cable according to the fourth embodiment of the present invention.
　この光ファイバケーブル１０Ｄは、第３実施形態の光ファイバケーブル１０Ｃの２本の抗張力体１５の代わりに、１本の帯板状の抗張力体２５を配設したものである。この場合、Ｙ軸がケーブル曲げ方向Ｍの中立線となるように、ケーブル中心Ｏに断面の長手方向をＹ軸上に一致させた姿勢で抗張力体２５が配設されている。 This optical fiber cable 10D is provided with a single strip-shaped tensile body 25 instead of the two tensile bodies 15 of the optical fiber cable 10C of the third embodiment. In this case, the tension member 25 is disposed at the cable center O in a posture in which the longitudinal direction of the cross section coincides with the Y axis so that the Y axis becomes a neutral line of the cable bending direction M.
　この光ファイバケーブル１０Ｄでは、帯板状の抗張力体２５を、その断面の長手方向をＹ軸に一致させた姿勢で、ケーブル中心Ｏに配置しているので、１本の抗張力体２５を用いながら、ケーブル曲げ方向ＭをＸ軸方向に限定することができる。その他の作用効果は、第３実施形態と同様である。 In this optical fiber cable 10D, the belt-like strength member 25 is disposed at the cable center O in a posture in which the longitudinal direction of the cross section coincides with the Y axis, so that one strength member 25 is used. The cable bending direction M can be limited to the X-axis direction. Other functions and effects are the same as those of the third embodiment.
　「第５実施形態」
　図５は本発明の第５実施形態の光ファイバケーブルのケーブル長手方向に垂直な横断面図である。 “Fifth Embodiment”
FIG. 5 is a transverse sectional view perpendicular to the longitudinal direction of the optical fiber cable according to the fifth embodiment of the present invention.
　この光ファイバケーブル１０Ｅは、第３実施形態の光ファイバケーブル１０Ｃの片方のスロット溝１２ｂに収納していたドロップ型の光ファイバケーブル１３ｈを、インドア型の光ファイバケーブル１３ｍに変更したものである。この光ファイバケーブル１０Ｅの作用効果は、第３実施形態と同様である。 This optical fiber cable 10E is obtained by replacing the drop-type optical fiber cable 13h housed in one slot groove 12b of the optical fiber cable 10C of the third embodiment with an indoor-type optical fiber cable 13m. The effect of the optical fiber cable 10E is the same as that of the third embodiment.
　「第１の比較例」
　図６は第１の比較例として示す光ファイバケーブルのケーブル長手方向に垂直な横断面図である。 "First comparative example"
FIG. 6 is a cross-sectional view perpendicular to the longitudinal direction of the optical fiber cable shown as the first comparative example.
　この光ファイバケーブル１０Ｐは、図９に示した従来例の光ファイバケーブル１１０の変形例に相当するもので、スロットコア１１には１つのスロット溝１２だけが設けられている。そして、この１つのスロット溝１２内に、複数種類の光ファイバ通信線として、光ファイバテープ心線１３ｇとインドア型の光ファイバケーブル１３ｍが収納されている。 This optical fiber cable 10P corresponds to a modification of the conventional optical fiber cable 110 shown in FIG. 9, and the slot core 11 is provided with only one slot groove 12. And in this one slot groove | channel 12, the optical fiber tape core wire 13g and the indoor type optical fiber cable 13m are accommodated as several types of optical fiber communication lines.
　この光ファイバケーブル１０Ｐでは、１つのスロット溝１２に光ファイバテープ心線１３ｇとインドア型の光ファイバケーブル１３ｍが収納されているので、光ファイバテープ心線１３ｇを取り出すときに、一緒にインドア型の光ファイバケーブル１３ｍも引き出してしまうおそれがある。また、光ファイバ通信線の種類毎に剛性や伸縮率が異なっているはずなのに、１つのスロット溝１２に一緒に収納するのは無理があり、実際にこのような形での複合化は難しいと言わざるを得ない。 In this optical fiber cable 10P, since the optical fiber tape core wire 13g and the indoor type optical fiber cable 13m are accommodated in one slot groove 12, when the optical fiber tape core wire 13g is taken out, the indoor type optical fiber cable 13g is taken together. The optical fiber cable 13m may be pulled out. Also, although the rigidity and expansion / contraction rate should be different for each type of optical fiber communication line, it is impossible to store them together in one slot groove 12, and it is actually difficult to combine in this form. I must say.
　「第２の比較例」
　図７は第２の比較例として示す光ファイバケーブルのケーブル長手方向に垂直な横断面図である。 "Second comparative example"
FIG. 7 is a cross-sectional view perpendicular to the cable longitudinal direction of an optical fiber cable shown as a second comparative example.
　この光ファイバケーブル１０Ｑは、図５に示した第５実施形態の光ファイバケーブル１０Ｅに対する比較例である。 This optical fiber cable 10Q is a comparative example for the optical fiber cable 10E of the fifth embodiment shown in FIG.
　スロットコア１１には２つのスロット溝１２ａ、１２ｂが設けられているものの、スロット溝１２ａ、１２ｂの配置の方向が、２本の抗張力体１５が並んでいる方向、つまりケーブル曲げ中心線となるＹ軸上ではなく、Ｘ軸上になっている。そして、各スロット溝１２ａ、１２ｂに、光ファイバテープ心線１３ｇとインドア型の光ファイバケーブル１３ｍが収納されている。 Although the slot core 11 is provided with two slot grooves 12a and 12b, the slot grooves 12a and 12b are arranged in the direction in which the two strength members 15 are arranged, that is, the cable bending center line Y It is on the X axis, not on the axis. The slot grooves 12a and 12b accommodate an optical fiber ribbon 13g and an indoor optical fiber cable 13m.
　この光ファイバケーブル１０Ｑでは、ケーブル曲げ方向Ｍが、２本の抗張力体１５の配置によりＸ軸方向に限定されるので、ケーブル曲げ時に、ケーブル曲げ中心に対して外側に位置する光ファイバ通信線ほど伸びやすく、ケーブル曲げ中心に対して内側に位置する光ファイバ通信線ほど圧縮しやすくなる。従って、内側に位置する光ファイバ通信線が圧縮歪みを多く受けやすくなり、伝送特性が確保されなくなるおそれがある。 In this optical fiber cable 10Q, the cable bending direction M is limited to the X-axis direction due to the arrangement of the two strength members 15, so that the optical fiber communication line positioned outward from the cable bending center when the cable is bent. The optical fiber communication line located on the inner side with respect to the cable bending center is more easily compressed. Therefore, the optical fiber communication line located inside is likely to receive a lot of compressive strain, and there is a possibility that transmission characteristics may not be ensured.
　「第３の比較例」
　図８は第３の比較例として示す光ファイバケーブルのケーブル長手方向に垂直な横断面図である。 "Third comparative example"
FIG. 8 is a cross-sectional view perpendicular to the cable longitudinal direction of an optical fiber cable shown as a third comparative example.
　この光ファイバケーブル１０Ｒは、図５に示した第５実施形態の光ファイバケーブル１０Ｅに対する比較例である。 This optical fiber cable 10R is a comparative example for the optical fiber cable 10E of the fifth embodiment shown in FIG.
　この光ファイバケーブル１０Ｒでは、２本の抗張力体１５を、図５の光ファイバケーブル１０Ｅのようにスロットコア１１の断面の中央に配置するのではなく、スロット溝１２ａ、１２ｂのケーブル半径方向外側のシース１４の内部に埋設している。 In this optical fiber cable 10R, the two strength members 15 are not arranged at the center of the cross section of the slot core 11 as in the optical fiber cable 10E of FIG. 5, but on the outside in the cable radial direction of the slot grooves 12a and 12b. It is embedded in the sheath 14.
　この光ファイバケーブル１０Ｒでは、２本の抗張力体１５がＹ軸上にあるものの、シース１４の内部に埋設されているので、シース１４の除去時やスロット溝１２内の光ファイバ通信線（光ファイバテープ心線１３ｇやインドア型の光ファイバケーブル１３ｍ）を取り出す時に、抗張力体１５が邪魔になり、光ファイバ通信線の取り出し作業が困難になる。 In this optical fiber cable 10R, although two strength members 15 are on the Y-axis, they are embedded in the sheath 14, so that the optical fiber communication line (optical fiber) in the slot groove 12 is removed when the sheath 14 is removed. When the tape core wire 13g or the indoor type optical fiber cable 13m) is taken out, the strength member 15 becomes an obstacle, and it becomes difficult to take out the optical fiber communication line.
　以上の比較例に対して、本発明の実施形態の光ファイバケーブルは、Ｙ軸がケーブル曲げ中立線となるように抗張力体１５、２５が配置されていること、Ｙ軸上の抗張力体より外側のケーブル中心Ｏに対して１８０度対向する位置に２つのスロット溝１２ａ、１２ｂが配置されていること、各スロット溝１２ａ、１２ｂに種類の異なる光ファイバ通信線が収納されていること、を必要な条件として、比較例における問題を回避しながら、次の効果を奏することができる。 In contrast to the comparative example described above, the optical fiber cable according to the embodiment of the present invention has the strength members 15 and 25 arranged so that the Y-axis is a cable bending neutral line, and is outside the strength member on the Y-axis. It is necessary that the two slot grooves 12a and 12b are disposed at positions that face the cable center O at 180 degrees, and that different types of optical fiber communication lines are accommodated in the respective slot grooves 12a and 12b. As a necessary condition, the following effects can be achieved while avoiding problems in the comparative example.
　（１）中間後分岐で取り出そうとする光ファイバ通信線の識別性を向上させる。 (1) Improve the discriminability of the optical fiber communication line to be taken out at the intermediate post branch.
　（２）複合ケーブル化を容易に図ることができる。 (2) A composite cable can be easily achieved.
　（３）ケーブルの曲げ方向を限定することができ、ケーブル曲げ時の伝送特性の確保を可能にする。 (3) The bending direction of the cable can be limited, and transmission characteristics can be secured when the cable is bent.
　（４）光ファイバ通信線の取り出しを容易にする。 (4) Facilitates removal of optical fiber communication lines.
　「第６実施形態」
　図９は本発明の第６実施形態の光ファイバケーブルのケーブル長手方向に垂直な横断面図である。 “Sixth Embodiment”
FIG. 9 is a cross-sectional view perpendicular to the longitudinal direction of the optical fiber cable according to the sixth embodiment of the present invention.
　この光ファイバケーブル１０Ｆは、第１～第５実施形態とは異なり、スロットコア１１及びシース１４を共に矩形状とした光ファイバケーブルである。これら第１～第５実施形態の断面円形状をなす光ファイバケーブルと同一構成部品には、同一の符号を付してその説明は省略する。 This optical fiber cable 10F is an optical fiber cable in which the slot core 11 and the sheath 14 are both rectangular, unlike the first to fifth embodiments. The same components as those of the optical fiber cable having the circular cross section of the first to fifth embodiments are denoted by the same reference numerals, and the description thereof is omitted.
　第６実施形態の光ファイバケーブル１０Ｆにおいては、２本の抗張力体１５は、矩形状をなすスロットコア１１のＹ軸上の位置で且つケーブル中心Ｏに近い位置に、互いに離間して平行に並べて配設されている。そして、２つのスロット溝１２ａ、１２ｂは、共にＹ軸上の位置で且つケーブル中心Ｏを挟んで１８０度対向する位置に配設されおり、各スロット溝１２ａ、１２ｂの開口部１６の幅方向の中央がＹ軸上に位置している。これら２つのスロット溝１２ａ、１２ｂは、２本の抗張力体１５よりもケーブル中心Ｏから遠い位置に配設されている。しかも、２つのスロット溝１２ａ、１２ｂは、ケーブル長手方向に沿って直線状に延びるストレート溝として形成されている。 In the optical fiber cable 10F of the sixth embodiment, the two strength members 15 are arranged in parallel and spaced apart from each other at a position on the Y axis of the rectangular slot core 11 and close to the cable center O. It is arranged. The two slot grooves 12a and 12b are both arranged on the Y-axis and at positions facing each other by 180 degrees with the cable center O in between, and the width direction of the opening 16 of each slot groove 12a and 12b is set. The center is located on the Y axis. These two slot grooves 12 a and 12 b are disposed at positions farther from the cable center O than the two strength members 15. Moreover, the two slot grooves 12a and 12b are formed as straight grooves extending linearly along the cable longitudinal direction.
　スロットコア１１とシース１４との間には、シース１４を構成する溶融樹脂がスロット溝１２ａ、１２ｂ内に入らないようにするための押さえテープ１７が当該スロットコア１１全体を覆うように設けられている。シース１４には、中間分岐する際に一部領域のシース１４を引き裂き易くするためのＶ溝に形成されたノッチ１８が設けられている。ノッチ１８は、Ｘ軸上に左右１箇所設けられており、ケーブル長手方向に連続して形成されている。 A pressing tape 17 is provided between the slot core 11 and the sheath 14 so as to cover the entire slot core 11 so that the molten resin constituting the sheath 14 does not enter the slot grooves 12a and 12b. Yes. The sheath 14 is provided with a notch 18 formed in a V-groove for facilitating the tearing of a partial region of the sheath 14 when the middle branch is made. The notch 18 is provided at one place on the X axis on the left and right sides, and is formed continuously in the cable longitudinal direction.
　この光ファイバケーブル１０Ｆでは、２つのスロット溝１２ａ、１２ｂに、それぞれ４本ずつの光ファイバ心線１３ａ、１３ｂ、１３ｃ、１３ｄ及び１３ｅ、１３ｆ、１３ｇ、１３ｈが収納されている。一方のスロット溝１２ａには、青、黄、緑、赤の４本の光ファイバ心線１３ａ、１３ｂ、１３ｃ、１３ｄが収納され、他方のスロット溝１２ｂには、茶、紫、白、灰の４本の光ファイバ心線１３ｅ、１３ｆ、１３ｇ、１３ｈが収納されている。 In this optical fiber cable 10F, four optical fiber core wires 13a, 13b, 13c, 13d and 13e, 13f, 13g, 13h are accommodated in the two slot grooves 12a, 12b, respectively. One slot groove 12a accommodates four optical fiber core wires 13a, 13b, 13c and 13d of blue, yellow, green and red, and the other slot groove 12b contains brown, purple, white and gray. Four optical fiber core wires 13e, 13f, 13g, and 13h are accommodated.
　この光ファイバケーブル１０Ｆによれば、２つのスロット溝１２ａ、１２ｂにそれぞれ色の組み合わせの異なる光ファイバ心線１３ａ～１３ｈを収納しているので、スロット溝１２ａ、１２ｂごとに光ファイバ心線１３ａ～１３ｈの種類の識別（色の区別）が可能であり、識別しやすくなり、必要な光ファイバ心線１３ａ～１３ｈだけを無理なく取り出すことができるようになる。従って、取り出す必要のない光ファイバ心線１３ａ～１３ｈに余計な影響を与えずにすむ。 According to the optical fiber cable 10F, the optical fiber core wires 13a to 13h having different color combinations are accommodated in the two slot grooves 12a and 12b, respectively. It is possible to identify the type of 13h (color distinction), it becomes easy to identify, and only the necessary optical fiber core wires 13a to 13h can be taken out without difficulty. Accordingly, the optical fiber core wires 13a to 13h that do not need to be taken out are not adversely affected.
　なお、第６実施形態の光ファイバケーブルにおいて、第３実施形態～第５実施形態におけるように、２つのスロット溝１２ａ、１２ｂに、それぞれ構造（種類）のタイプの異なる光ファイバが収納されていてもよい。 In the optical fiber cable of the sixth embodiment, as in the third to fifth embodiments, optical fibers having different types of structures (kinds) are accommodated in the two slot grooves 12a and 12b, respectively. Also good.
　本発明は、シースを切り裂いてスロットコアに収納してある光ファイバを取り出すのに適した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 suitable for taking out an optical fiber housed in a slot core by cutting a sheath.

Claims (2)

  1. 　光ファイバ通信線を内部に収納するスロット溝を備えたスロットコアと、このスロットコアの周囲を被覆するシースと、前記スロットコアの内部にケーブル長手方向に沿って埋設された抗張力体と、を備えた光ファイバケーブルにおいて、
    　ケーブル長手方向に垂直な断面においてケーブル中心を通り互いに直交する方向をＸ軸とＹ軸としたとき、
    　一方の前記Ｙ軸がケーブル曲げ中立線となるように、前記スロットコアの内部の前記Ｙ軸上の位置で且つケーブル中心に近い位置に２本の前記抗張力体が互いに平行に並べて配設され、
    　前記スロット溝が、共に前記Ｙ軸上の位置で且つ前記ケーブル中心を挟んで１８０度対向する位置に２つ配設され、
    　これら２つのスロット溝は、前記抗張力体よりもケーブル中心から遠い位置に配設され、しかも、ケーブル長手方向に沿って直線状に延びるストレート溝として形成され、
    　これら２つのスロット溝のうちの一方のスロット溝と他方のスロット溝に、光ファイバ通信線がそれぞれ収納されていることを特徴とする光ファイバケーブル。     A slot core having a slot groove for accommodating an optical fiber communication line therein; a sheath covering the periphery of the slot core; and a tensile body embedded in the slot core along the longitudinal direction of the cable. Optical fiber cable
    When the direction perpendicular to each other through the cable center in the cross section perpendicular to the cable longitudinal direction is the X axis and the Y axis,
    The two strength members are arranged in parallel with each other at a position on the Y axis inside the slot core and near the center of the cable so that one of the Y axes is a cable bending neutral line,
    Two of the slot grooves are arranged at positions on the Y-axis that are opposed to each other by 180 degrees across the cable center,
    These two slot grooves are disposed at a position farther from the cable center than the tensile body, and are formed as straight grooves extending linearly along the cable longitudinal direction,
    An optical fiber cable, wherein an optical fiber communication line is accommodated in one of the two slot grooves and the other slot groove, respectively.
  2. 　光ファイバ通信線を内部に収納するスロット溝を備えたスロットコアと、このスロットコアの周囲を被覆するシースと、前記スロットコアの内部にケーブル長手方向に沿って埋設された抗張力体と、を備えた光ファイバケーブルにおいて、
    　ケーブル長手方向に垂直な断面においてケーブル中心を通り互いに直交する方向をＸ軸とＹ軸としたとき、
    　一方の前記Ｙ軸がケーブル曲げ中立線となるように、前記スロットコアの内部の前記Ｙ軸上の位置で且つケーブル中心に近い位置に、断面の長手方向を前記Ｙ軸上に一致させた姿勢で帯板状の前記抗張力体が１本配設され、
    　前記スロット溝が、共に前記Ｙ軸上の位置で且つ前記ケーブル中心を挟んで１８０度対向する位置に２つ配設され、
    　これら２つのスロット溝は、前記抗張力体よりもケーブル中心から遠い位置に配設され、しかも、ケーブル長手方向に沿って直線状に延びるストレート溝として形成され、
    　これら２つのスロット溝のうちの一方のスロット溝と他方のスロット溝に、光ファイバ通信線がそれぞれ収納されていることを特徴とする光ファイバケーブル。     A slot core having a slot groove for accommodating an optical fiber communication line therein; a sheath covering the periphery of the slot core; and a tensile body embedded in the slot core along the longitudinal direction of the cable. Optical fiber cable
    When the direction perpendicular to each other through the cable center in the cross section perpendicular to the cable longitudinal direction is the X axis and the Y axis,
    An attitude in which the longitudinal direction of the cross section coincides with the Y-axis at a position on the Y-axis inside the slot core and close to the cable center so that one Y-axis becomes a cable bending neutral line And a single strip-shaped tensile body is provided,
    Two of the slot grooves are arranged at positions on the Y-axis that are opposed to each other by 180 degrees across the cable center,
    These two slot grooves are disposed at a position farther from the cable center than the tensile body, and are formed as straight grooves extending linearly along the cable longitudinal direction,
    An optical fiber cable, wherein an optical fiber communication line is accommodated in one of the two slot grooves and the other slot groove, respectively.
PCT/JP2011/060272 2010-04-28 2011-04-27 Optical fiber cable WO2011136274A1 (en)

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JPH0943464A (en) * 1995-08-02 1997-02-14 Fujikura Ltd H-groove type optical fiber cable
JP2004240061A (en) * 2003-02-04 2004-08-26 Furukawa Electric Co Ltd:The Optical fiber cable
JP2005049658A (en) * 2003-07-29 2005-02-24 Furukawa Electric Co Ltd:The Optical fiber cable
JP2005157159A (en) * 2003-11-28 2005-06-16 Ube Nitto Kasei Co Ltd Method for manufacturing frp for drop optical cable and drop optical fiber cable obtained by using same frp
JP2008076897A (en) * 2006-09-22 2008-04-03 Fujikura Ltd Optical fiber cable

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JPH08160265A (en) * 1994-11-30 1996-06-21 Fujikura Ltd Optical fiber cable
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JPH0943464A (en) * 1995-08-02 1997-02-14 Fujikura Ltd H-groove type optical fiber cable
JP2004240061A (en) * 2003-02-04 2004-08-26 Furukawa Electric Co Ltd:The Optical fiber cable
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JP2005157159A (en) * 2003-11-28 2005-06-16 Ube Nitto Kasei Co Ltd Method for manufacturing frp for drop optical cable and drop optical fiber cable obtained by using same frp
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CN104080905A (en) * 2011-12-22 2014-10-01 生命技术公司 Cell culture media and methods

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