JPH0322728Y2 - - Google Patents
Info
- Publication number
- JPH0322728Y2 JPH0322728Y2 JP1981029243U JP2924381U JPH0322728Y2 JP H0322728 Y2 JPH0322728 Y2 JP H0322728Y2 JP 1981029243 U JP1981029243 U JP 1981029243U JP 2924381 U JP2924381 U JP 2924381U JP H0322728 Y2 JPH0322728 Y2 JP H0322728Y2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- cable
- unit
- optical
- elongation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000013307 optical fiber Substances 0.000 claims description 36
- 230000003287 optical effect Effects 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Processes Specially Adapted For Manufacturing Cables (AREA)
Description
【考案の詳細な説明】
光フアイバをテンシヨンメンバなどの回りに集
合する時、より方向を交互反転よりして、たるみ
を付けることはすでに提案されている。[Detailed Description of the Invention] It has already been proposed to create slack by alternately reversing the direction of optical fibers when gathering them around a tension member or the like.
このようにすると、光ケーブルに引張りヒズミ
が加わつた時でも、たるみ部分がまずのびるた
め、そのヒズミが光フアイバに加わらないように
なる。しかしながらこの方法では、光フアイバが
細いため、とり扱いにくいという欠点がある。 In this way, even when tensile strain is applied to the optical cable, the slack portion stretches first, so that the strain is not applied to the optical fiber. However, this method has the disadvantage that it is difficult to handle because the optical fiber is thin.
また、ユニツト型のケーブルは次の構造、すな
わち、0.95mmφ程度の鋼線の回りに光フアイバを
撚つてユニツトとし、そのユニツトをケーブル中
心のテンシヨンメンバの回りに撚つた構造である
（第１図参照）。 Unit type cables have the following structure: optical fibers are twisted around steel wires of approximately 0.95 mm diameter to form a unit, and the unit is twisted around a tension member at the center of the cable (first (see figure).
ところが、このような構造では、もし光ケーブ
ルが引張られたとすると、中心のテンシヨンメン
バとユニツトの鋼線との間に押し合う力が発生
し、光フアイバが間にはさまれて、特性が劣化す
る。 However, in such a structure, if the optical cable is pulled, a pressing force will be generated between the central tension member and the steel wire of the unit, and the optical fiber will be caught between them, deteriorating its characteristics. do.
本考案においては、１本１本の光フアイバを交
互反転するということはしないで、光フアイバそ
のものは一方向より集合して光フアイバユニツト
を作り、そのユニツトを中心支持体上に積み上げ
てケーブル心にする時に、より方向を交互反転し
てたるみを持たせ、上記の場合とほぼ同じ働きを
するようにした。この方法によると、交互よりす
るユニツト径が大であるので、容易に行なうこと
ができる。 In the present invention, instead of alternately inverting each optical fiber, the optical fibers themselves are assembled from one direction to form an optical fiber unit, and the units are stacked on a central support to create a cable core. When doing this, the direction is alternately reversed to create more slack, so that it works almost the same way as in the case above. According to this method, the diameter of the units to be alternately twisted is large, so it can be easily carried out.
また、上記の特性劣化の問題も解消できる。 Furthermore, the problem of characteristic deterioration described above can also be solved.
実施例（第１、第２図） １０は光フアイバユニツト。Example (Figures 1 and 2) 10 is an optical fiber unit.
テンシヨンメンバ１２の回りに複数本の光フア
イバ１４を一方向よりに集合し、その上に緩衝材
１６を設け、押え巻１８を施したものである。 A plurality of optical fibers 14 are gathered around a tension member 12 in one direction, a cushioning material 16 is provided thereon, and a pressure winding 18 is applied.
２０は中心支持体。 20 is the center support.
たとえば鋼線などのテンシヨンメンバ２２の回
りにポリエチレンなどの被覆２４を設けたもので
ある。 For example, a coating 24 such as polyethylene is provided around a tension member 22 such as a steel wire.
中心支持体２０上に光フアイバユニツト１０を
積み上げる時、「第２図」に模型的に示した（た
だし１本のユニツト１０についてのみ）のよう
に、より方向を交互反転よりし、たるみ５０を作
るようにする。なお、P1はよりピツチ、P2は反
転よりピツチを示す。 When stacking the optical fiber units 10 on the center support 20, the directions are alternately reversed to reduce the slack 50, as schematically shown in FIG. Try to make it. Note that P 1 indicates more pitch, and P 2 indicates pitch more than inversion.
３０はシースである。 30 is a sheath.
張力が加わつてケーブルが伸びると、まずたる
み５０の部分が伸びる。そのためユニツト１０の
伸びはケーブルの伸びより小さくなる。したがつ
て光フアイバ１４の伸びもケーブルの伸びより小
さくなる。 When tension is applied to the cable and the cable is stretched, first the slack 50 is stretched. Therefore, the elongation of the unit 10 is smaller than the elongation of the cable. Therefore, the elongation of the optical fiber 14 is also smaller than the elongation of the cable.
実験例
ケーブル中心のテンシヨンメンバ２２は1.4mm
φ鋼線の７本より。その回りにポリエチレン被覆
２４を設け、中心支持体２０の外径は10mm。Experimental example Tension member 22 at the center of the cable is 1.4mm
From 7 φ steel wires. A polyethylene coating 24 is provided around it, and the outer diameter of the central support 20 is 10 mm.
各ユニツト１０のテンシヨンメンバ１２は0.95
mmφの鋼線。光フアイバ１４は0.9mmφのもの６
本を一方向より。その上に緩衝材１６、押え巻１
８を施して、ユニツト１０の外径は４mmφ。 Tension member 12 of each unit 10 is 0.95
mmφ steel wire. Optical fiber 14 is 0.9mmφ6
Books from one direction. On top of that, cushioning material 16, presser roll 1
8, the outer diameter of the unit 10 is 4mmφ.
このようなユニツト１０を１本と、同じ４mmφ
のポリエチレンの丸ひも４０の９本とを、中心支
持体２０上に交互反転よりしてケーブル心とし
た。その反転よりピツチP2は300mm。 One such unit 10 and the same 4mmφ
Nine round polyethylene cords 40 were twisted alternately on the center support 20 to form a cable core. From the reverse, Pitzchi P 2 is 300mm.
その上にシースを施して全体の外径を24mmとし
た。 A sheath was placed on top of it to make the overall outer diameter 24 mm.
比較のために、ユニツト１０ならびに丸ひも４
０を上記と同じよりピツチで一方向よりし、その
他は全く同じにした光ケーブルも試作した。 For comparison, unit 10 and round cord 4
We also produced a prototype optical cable in which the wire was twisted in one direction with the same pitch as above, but the rest was exactly the same.
それらのケーブルを、両方とも200mずつ直線
上に伸ばし、張力を1000Kgまで加え、その時のケ
ーブルの伸びと光フアイバ１４の伸びとを測定し
た。 Both cables were stretched in a straight line for 200 m, tension was applied up to 1000 kg, and the elongation of the cable and the elongation of the optical fiber 14 at that time were measured.
なお、ケーブルの伸びは、その中央部に20mの
間隔をおいて付けた標点間の長さ変化から求め
た。 The elongation of the cable was determined from the change in length between gauge points placed at 20m intervals in the center of the cable.
また、光フアイバ１４の伸びは、ケーブル内の
光フアイバ１４を折返し接続し、その中を伝わる
光パルスの遅延時間を測定することにより求め
た。 Further, the elongation of the optical fiber 14 was determined by connecting the optical fiber 14 in the cable back and measuring the delay time of the optical pulse traveling therein.
「第３図」にその結果を示す。 The results are shown in "Figure 3".
Ｘが本考案のたるみ付き光ケーブル、Ｙが一方
向より光ケーブルである。 X is an optical cable with slack according to the present invention, and Y is a unidirectional optical cable.
一方向よりケーブルでは、光フアイバ１４の伸
びがケーブルの伸びにほぼ一致している。 In a unidirectional cable, the elongation of the optical fiber 14 approximately matches the elongation of the cable.
しかし、本考案のたるみ付きケーブルでは、光
フアイバ１４の伸びがケーブルの伸びの約1/3に
減少している。 However, in the slack cable of the present invention, the elongation of the optical fiber 14 is reduced to about 1/3 of the elongation of the cable.
考案の効果
(1) 光フアイバユニツト１０を交互反転よりして
いるので、ケーブルに張力が加わつた時、上記
のようにケーブルの伸びに比べて光フアイバ１
４の伸びが小さくなる。Effects of the invention (1) Since the optical fiber unit 10 is alternately reversed, when tension is applied to the cable, the optical fiber 1
The elongation of 4 becomes smaller.
(2) たとえば４mmφ程度の太い光フアイバユニツ
ト１０の交互反転よりの方が、0.9mmφ程度の
大変細い光フアイバ１４の交互反転よりよりも
容易である。(2) For example, it is easier to alternately invert a thick optical fiber unit 10 of about 4 mmφ than to alternately invert a very thin optical fiber 14 of about 0.9 mmφ.
(3) ユニツト１０自体が中心支持体２０に交互反
転撚りしてあるので、ケーブルが引張られたと
き、ユニツトはケーブルの円周方向に逃げるこ
とができる。(3) Since the unit 10 itself is twisted in alternating turns on the central support 20, the unit can escape in the circumferential direction of the cable when the cable is pulled.
そのために、ユニツトのテンシヨンメンバ１
４と中心支持体２０との間に押し合う力が発生
しなくなり、光フアイバ１０が間にはさまれて
特性が劣化するということが起きない。 For this purpose, the tension member 1 of the unit
Since no pressing force is generated between the optical fiber 4 and the center support 20, the optical fiber 10 will not be caught between them and its characteristics will not deteriorate.
(4) 光フアイバユニツト１０は中心支持体２０の
回りにらせん巻きしているので、その長さは、
中心支持体２０の長さ、すなわちケーブルの長
さよりも長い。(4) Since the optical fiber unit 10 is spirally wound around the central support 20, its length is
The length of the central support 20 is longer than the length of the cable.
本考案の場合は、中心支持体２０の回りに光
フアイバユニツト１０自体を反転させるのであ
るから、従来の考えのように、光フアイバユニ
ツト１０内（中心支持体２０よりも長い）で光
フアイバ１４を反転させるのに比べて、反転の
回数が少なくて済む。 In the case of the present invention, since the optical fiber unit 10 itself is inverted around the center support 20, unlike the conventional idea, the optical fiber 14 is The number of times of reversal is reduced compared to reversing .
図面はすべて本考案の実施例に係るもので、第
１図は断面図、第２図は光フアイバユニツト１０
の交互反転よりの様子をただ１本について模型的
に示した説明図、第３図は光ケーブルの伸びと光
フアイバ１４の伸び図。
１０：光フアイバユニツト、１２：テンシヨン
メンバ、１４：光フアイバ、２０：中心支持体。
The drawings are all related to embodiments of the present invention, and FIG. 1 is a sectional view, and FIG. 2 is a sectional view of the optical fiber unit 10.
FIG. 3 is an explanatory diagram schematically showing the state of alternating reversal of only one fiber. FIG. 3 is a diagram showing the extension of the optical cable and the extension of the optical fiber 14. 10: Optical fiber unit, 12: Tension member, 14: Optical fiber, 20: Center support.
Claims (1)
ユニツト１０を、中心支持体２０の周囲により合
わせてケーブル心とした光ケーブルにおいて、 光フアイバユニツト１０は交互反転よりされ、 光フアイバユニツト１０内においては、光フア
イバ１４は、一方向よりされていることを特徴と
する光ケーブル。[Claims for Utility Model Registration] In an optical cable in which an optical fiber unit 10 consisting of a plurality of optical fibers 14 is twisted around a central support 20 as a cable core, the optical fiber unit 10 is alternately inverted, and the optical fiber unit 10 is alternately inverted. An optical cable characterized in that within the fiber unit 10, the optical fibers 14 are twisted in one direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981029243U JPH0322728Y2 (en) | 1981-03-03 | 1981-03-03 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981029243U JPH0322728Y2 (en) | 1981-03-03 | 1981-03-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57142704U JPS57142704U (en) | 1982-09-07 |
| JPH0322728Y2 true JPH0322728Y2 (en) | 1991-05-17 |
Family
ID=29826847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1981029243U Expired JPH0322728Y2 (en) | 1981-03-03 | 1981-03-03 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0322728Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5393043A (en) * | 1977-01-25 | 1978-08-15 | Sumitomo Electric Ind Ltd | Optical fiber cable |
-
1981
- 1981-03-03 JP JP1981029243U patent/JPH0322728Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5393043A (en) * | 1977-01-25 | 1978-08-15 | Sumitomo Electric Ind Ltd | Optical fiber cable |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57142704U (en) | 1982-09-07 |
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