JPH06258558A - Spacer for carrying optical fiber - Google Patents
Spacer for carrying optical fiberInfo
- Publication number
- JPH06258558A JPH06258558A JP5047798A JP4779893A JPH06258558A JP H06258558 A JPH06258558 A JP H06258558A JP 5047798 A JP5047798 A JP 5047798A JP 4779893 A JP4779893 A JP 4779893A JP H06258558 A JPH06258558 A JP H06258558A
- Authority
- JP
- Japan
- Prior art keywords
- spacer
- optical fiber
- pbt
- resin
- optical fibers
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、光ファイバ担持用ス
ペーサに関し、特に、スペーサの耐圧縮性能を改良する
技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spacer for carrying an optical fiber, and more particularly to a technique for improving the compression resistance of the spacer.
【０００２】[0002]
【従来の技術】電気通信の分野に用いられている光ファ
イバは、多数本を集合してケーブル化させる際には、光
ファイバ単体若しくは光ファイバテープをスペーサに担
持させた状態で使用されている。このような光ファイバ
担持用スペーサは、現在、主として高密度ポリエチレン
（以下、ＨＤＰＥと略称する）樹脂により成形されてい
るが、光ファイバの使用個所も海底ケーブルなどに用い
られていて、多岐にわたっている。2. Description of the Related Art Optical fibers used in the field of telecommunications are used when a large number of optical fibers are assembled into a cable and a single optical fiber or an optical fiber tape is carried by a spacer. . At present, such an optical fiber carrying spacer is mainly formed of a high-density polyethylene (hereinafter abbreviated as HDPE) resin, but the places where the optical fiber is used are also widely used in submarine cables. .
【０００３】ところで、光ファイバが海底ケーブルに使
用される場合には、光ファイバを担持するスペーサにも
大きな水圧に耐えることが要求される。そこで、従来
は、スペーサの溝内に光ファイバや光ファイバテープ心
線を収納した後に、その上に金属テープなどの補強材を
複数層巻き付け、補強材の上からシースを被覆するとい
った構造が採用されていた。このような構造の海底ケー
ブルにおいては、前述した構造から径も太く、単位長さ
当たりの重量も重いという欠点があるので、その軽量化
が要請されているが、軽量化を達成する上で、以下に説
明する技術的課題があった。By the way, when the optical fiber is used for a submarine cable, the spacer carrying the optical fiber is also required to withstand a large water pressure. Therefore, conventionally, a structure has been adopted in which the optical fiber or the optical fiber tape core wire is housed in the groove of the spacer, and then a plurality of layers of reinforcing material such as metal tape are wound thereon and the sheath is covered over the reinforcing material. It had been. The submarine cable having such a structure has the drawbacks that the diameter is large and the weight per unit length is heavy from the structure described above. Therefore, weight reduction is required, but in order to achieve weight reduction, There was a technical problem described below.
【０００４】[0004]
【発明が解決しようとする課題】すなわち、上述したよ
うにスペーサの形成用樹脂としては、主としてＨＤＰＥ
樹脂が用いられているが、このＨＤＰＥ樹脂は、光ファ
イバ担持用スペーサとして低温における機械的特性，加
工性，経済性などのバランスが取れた樹脂ではあるが、
圧縮強度が低いため、耐圧縮性能を要求される海底ケー
ブル用では、厚い補強層を設ける必要があり、その結
果、海底ケーブルの軽量化が難しくなるとともに、曲げ
剛性も高くなるため、非常に敷設が困難になっていた。That is, as described above, the resin for forming the spacer is mainly HDPE.
Although a resin is used, this HDPE resin is a resin that has well-balanced mechanical properties at low temperatures, processability, economical efficiency, etc. as a spacer for supporting an optical fiber.
Due to its low compressive strength, it is necessary to provide a thick reinforcement layer for submarine cables that require compression resistance. As a result, it is difficult to reduce the weight of the submarine cable, and the bending rigidity also increases, so it is extremely laid. Was getting difficult.
【０００５】また、光ファイバないしは光ファイバテー
プ心線をより多く担持させ、高密度化を図る際にも、リ
ブの厚みを極端に薄くすると、溝の形状が崩れるなどの
欠点があって、設計の自由度が制限されていた。さら
に、これ以外に、ＨＤＰＥ樹脂の欠点は、熱変形温度
が８０℃と低いため、高温での使用ができない。成形
時の体積収縮率が大きいため、押し出し成形機のダイス
の設計が難しく、複雑な断面形状では寸法精度がでな
い。In addition, even when a large number of optical fibers or optical fiber tape core wires are carried and the density is increased, there is a drawback that the shape of the groove is collapsed if the rib thickness is extremely thin, which is a design problem. The degree of freedom was limited. Further, in addition to this, the disadvantage of HDPE resin is that it cannot be used at high temperature because its heat distortion temperature is as low as 80 ° C. Since the volumetric shrinkage rate at the time of molding is large, it is difficult to design the die of the extrusion molding machine, and the dimensional accuracy cannot be obtained with a complicated sectional shape.
【０００６】熱収縮率が大きく、テンションメンバー
を導入しても、本体樹脂との密着性が不十分な場合など
に光ファイバにマイクロベンディングを引き起こす。
原料にゲル状物が多く含まれており、熱安定性も悪く、
連続的に製造すると分解物が発生し、溝の寸法精度が低
下する。また、溝の表面粗さが大きく、光ファイバの伝
送損失増につながる場合がある。[0006] The heat shrinkage is large, and even if the tension member is introduced, microbending is caused in the optical fiber when the adhesiveness to the resin of the main body is insufficient.
The raw material contains a lot of gel, and the thermal stability is poor,
If it is manufactured continuously, decomposed products are generated and the dimensional accuracy of the groove is reduced. Further, the surface roughness of the groove is large, which may lead to an increase in transmission loss of the optical fiber.
【０００７】一方、光ファイバケーブルは、今後加入者
系にもその使用を拡大されるが、その際は、敷設工事の
容易性，経済性などから現在使用されているケーブルよ
りも細径化，高密度化が要求されている。そのために、
例えば、特開平４−１４３７１０号公報，特開平４−１
８２６０８号公報，特開平４−７７１０９号公報，特開
平４−２２０６１２号公報，特開平４−３７２９１６号
公報，特開平５−１９１５１号公報，特開平４−１４３
７１０号公報，特開平４−１８２６０８号公報などに
は、各種のスペーサやケーブルが提案されている。On the other hand, the use of the optical fiber cable will be expanded to the subscriber system in the future, but at that time, the diameter of the optical fiber cable is made smaller than that of the cable currently used because of easiness of laying work and economical efficiency. Higher density is required. for that reason,
For example, JP-A-4-143710 and JP-A-4-1-1.
No. 82608, No. 4-77109, No. 4-220612, No. 4-372916, No. 5-19151, No. 4-143.
Various spacers and cables are proposed in Japanese Patent Application Laid-Open No. 710, Japanese Patent Application Laid-Open No. 4-182608, and the like.
【０００８】スペーサ自体の耐圧縮性能を向上させるこ
とができれば、海底ケーブルにおいても上記公報に開示
されているようなスペーサ形状を採用することも期待さ
れる。ところが、ＨＤＰＥ樹脂をスペーサの形成材料と
している場合には、このような用途へ適用することがで
きなかった。そこで、本発明者らはスペーサ用の樹脂に
要求される様々な特性について検討した。[0008] If the compression resistance of the spacer itself can be improved, it is expected that the submarine cable will also adopt the spacer shape as disclosed in the above publication. However, when the HDPE resin is used as the material for forming the spacer, it cannot be applied to such an application. Therefore, the present inventors have examined various characteristics required for the resin for the spacer.
【０００９】その結果、スペーサ用の樹脂としては、低
温脆化温度と、耐圧縮性能とが非常に重要であるとの結
論に達した。低温脆化温度が重要な理由は、ケーブルの
使用環境温度が−４０℃〜＋７０℃の温度範囲で敷設さ
れたり、曲げられたままで長期間使用されていることが
わかり、この温度範囲内で十分な性能を確保しなければ
ならないからである。As a result, it was concluded that low temperature embrittlement temperature and compression resistance are very important for the spacer resin. The reason why the low temperature embrittlement temperature is important is that the environment temperature of the cable is laid in the temperature range of -40 ° C to + 70 ° C, or is used for a long time while being bent. This is because it is necessary to secure high performance.
【００１０】また、耐圧縮性能が重要な理由は、例え
ば、敷設作業中にケーブルが踏まれたり、何か重量物の
下敷きになったりすると、ケーブルには側圧がかかる
が、このような時に溝内に収納されている光ファイバに
ダメージを残してはならない。つまり、圧縮変形が発生
した場合でも荷重が除去されれば元の状態に復元する必
要がある。Further, the reason why the compression resistance is important is that, for example, if the cable is stepped on during the laying work or is laid under a heavy object, a lateral pressure is applied to the cable. Do not leave damage to the optical fiber contained within. That is, even if compressive deformation occurs, it is necessary to restore the original state if the load is removed.
【００１１】また、既設の配管の中にケーブルを通す際
には、曲げ応力や引っ張り応力がかかるが、このような
状態になってもケーブルの伝送特性が低下してはならな
い。加わる応力の大きさは、ケーブルの仕様によって異
なるが、加入者系の場合には、ケーブルとして２５０ｋ
ｇ／５０ｍｍの荷重で有意な伝送損失増がないことが求
められており、このような要求に応えるためには、スペ
ーサの耐圧縮性能を所定の範囲に確保する必要がある。Further, when the cable is passed through the existing pipe, bending stress and tensile stress are applied. Even in such a state, the transmission characteristics of the cable should not be deteriorated. The amount of stress applied depends on the cable specifications, but in the case of a subscriber system, it is 250k as a cable.
It is required that there is no significant increase in transmission loss under a load of g / 50 mm, and in order to meet such a demand, it is necessary to secure the compression resistance performance of the spacer within a predetermined range.
【００１２】本発明は、以上のような実情に鑑みてなさ
れたものであって、その目的とするところは、従来のＨ
ＤＰＥ樹脂製のスペーサの問題を解決し、耐圧縮性能と
使用環境特性とを兼ね備えた光ファイバ担持用スペーサ
を提供することにある。The present invention has been made in view of the above circumstances, and the purpose thereof is to achieve the conventional H
An object of the present invention is to provide a spacer for supporting an optical fiber that solves the problem of the spacer made of DPE resin and has both compression resistance and use environment characteristics.
【００１３】[0013]
【課題を解決するための手段】上記目的を達成するた
め、本発明は、光ファイバまたは光ファイバテープを収
納する溝が設けられた合成樹脂製の光ファイバ担持用ス
ペーサにおいて、前記合成樹脂は、ポリブチレンテレフ
タレートとポリカーボネートとの混合物から構成され、
前記ポリブチレンテレフタレートとポリカーボネートと
の混合比率を７／３〜３／７の範囲内に設定したことを
特徴とする。In order to achieve the above object, the present invention provides an optical fiber carrying spacer made of synthetic resin, which is provided with a groove for accommodating an optical fiber or an optical fiber tape. Composed of a mixture of polybutylene terephthalate and polycarbonate,
The mixing ratio of the polybutylene terephthalate and the polycarbonate is set within the range of 7/3 to 3/7.
【００１４】この場合、ポリブチレンテレフタレートと
ポリカーボネートとの混合比率を７／３〜３／７の範囲
内に設定される理由は、ＰＢＴ／ＰＣが７／３を越える
と、低温脆化温度が−３０℃以上となり、低温特性が満
足できなくなるともに、ＰＢＴ／ＰＣが３／７を越える
と、環境応力亀裂試験による特性が低下するため、前記
範囲にしなければならない。In this case, the reason why the mixing ratio of polybutylene terephthalate and polycarbonate is set within the range of 7/3 to 3/7 is that when PBT / PC exceeds 7/3, the low temperature embrittlement temperature is-. When the temperature becomes 30 ° C. or higher, the low temperature characteristics cannot be satisfied, and when PBT / PC exceeds 3/7, the characteristics due to the environmental stress cracking test deteriorate, so the above range must be satisfied.
【００１５】[0015]
【作用】上記構成の光ファイバ担持用スペーサによれ
ば、スペーサの形成用樹脂が、ポリブチレンテレフタレ
ート（以下、ＰＢＴと略称する）とポリカーボネート
（以下、ＰＣと略称する）との混合物から構成されてい
るので、後述する実施例の作用効果から明らかなよう
に、従来のＨＤＰＥ樹脂製のスペーサに対して、同一直
径であれば、約２倍の耐圧縮強度が得られる。また、同
一圧縮強度であれば、スペーサのリブの肉厚を薄くする
ことができ、これにより、ケーブルの直径が細くするこ
とができるとともに、スペーサ断面における溝部の断面
割合を大きくすることが可能になる。According to the spacer for carrying an optical fiber having the above structure, the resin for forming the spacer is composed of a mixture of polybutylene terephthalate (hereinafter abbreviated as PBT) and polycarbonate (hereinafter abbreviated as PC). Therefore, as is clear from the operation and effect of the examples to be described later, if the spacer has the same diameter as that of the conventional spacer made of HDPE resin, about twice the compressive strength can be obtained. Further, if the compressive strength is the same, the rib thickness of the spacer can be reduced, which enables the diameter of the cable to be reduced and the cross-section ratio of the groove portion in the spacer cross-section to be increased. Become.
【００１６】[0016]
【実施例】以下本発明の好適な実施例について添附図面
を参照にして詳細に説明する。実施例１ （ＰＢＴ／ＰＣ＝５／５） 図１は、本発明にかかる光ファイバ担持用スペーサの実
施例１を示している。同図に示す光ファイバ担持用スペ
ーサは、合成樹脂で一体成形された本体部１と、この本
体部１を押し出し成形する際に、その外周にほぼ等角度
間隔で設けら、光ファイバまたは光ファイバ心線が収納
される５個の溝２ａ〜２ｅを有していて、本体部１の中
心には、ＫＦＲＰ（アラミド繊維強化合成樹脂）製の抗
張力線３が配置されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. Example 1 (PBT / PC = 5/5) FIG. 1 shows Example 1 of the spacer for carrying an optical fiber according to the present invention. The spacer for supporting an optical fiber shown in the figure is provided with an optical fiber or an optical fiber which is integrally formed of synthetic resin and is provided at substantially equal angular intervals on the outer periphery of the main body 1 when the main body 1 is extrusion molded. It has five grooves 2a to 2e for accommodating the core wire, and a tensile strength wire 3 made of KFRP (aramid fiber reinforced synthetic resin) is arranged at the center of the main body 1.
【００１７】溝２ａ〜２ｅは、所定のピッチで本体部１
を周回する螺旋状に形成され、各溝２ａ〜２ｅは、略扇
形断面のリブ４ａ〜４ｅにより略凹形に画成されてい
る。このような光ファイバ担持用スペーサを以下の条件
で試作した。本体部１の合成樹脂は、ＰＢＴ／ＰＣの混
合比率が５／５の混合樹脂（ＰＢＴ／ＰＣポリマーアロ
イ、帝人株式会社製、商品名、Ｈ７５００Ｎ）を用い、
溝２ａ〜２ｅの幅が２．７ｍｍ、溝２ａ〜２ｅの深さが
２．８ｍｍ、ピッチが５００ｍｍになるように設定し
た。The grooves 2a to 2e are formed on the main body 1 at a predetermined pitch.
Each of the grooves 2a to 2e is formed in a spiral shape that circulates around, and is defined in a substantially concave shape by ribs 4a to 4e having a substantially fan-shaped cross section. Such an optical fiber carrying spacer was experimentally manufactured under the following conditions. As the synthetic resin of the main body portion 1, a mixed resin (PBT / PC polymer alloy, manufactured by Teijin Ltd., trade name, H7500N) having a PBT / PC mixing ratio of 5/5 is used.
The width of the grooves 2a to 2e was set to 2.7 mm, the depth of the grooves 2a to 2e was set to 2.8 mm, and the pitch was set to 500 mm.
【００１８】得られたスペーサは、本体部１の外径Ｄ1
が１０．４ｍｍで、溝２ａ〜２ｅ間の谷径Ｄ2 が４．４
ｍｍで、リブ４ａ〜４ｅの根元部分の厚みｌが０．４３
ｍｍであった。このようにして得られたスペーサに、図
２に示すように、溝２ａ内に８心の光ファイバ心線５を
５段収納し、図３に示す方法で圧縮荷重を加え、この時
に最も圧縮による影響を受けやすい最上下段の光ファイ
バ心線５の両端側の光ファイバ（図２に符号Ａ〜Ｄで示
している）の伝送損失を測定した。また、このような圧
縮荷重を加えた後に、荷重を除去し、３分経過後のスペ
ーサの寸法変化を測定したが、残留歪みは全く認められ
なかった。The obtained spacer has an outer diameter D 1 of the main body 1.
Is 10.4 mm and the valley diameter D 2 between the grooves 2a to 2e is 4.4.
mm, the thickness l of the root portions of the ribs 4a to 4e is 0.43.
It was mm. In the spacer thus obtained, as shown in FIG. 2, five optical fiber core wires 5 of 8 cores are housed in the groove 2a, and a compressive load is applied by the method shown in FIG. The transmission loss of the optical fibers (indicated by reference characters A to D in FIG. 2) on both ends of the uppermost optical fiber core wire 5 which is easily affected by is measured. After applying such a compressive load, the load was removed and the dimensional change of the spacer was measured after 3 minutes, but no residual strain was observed.
【００１９】実施例２（ＰＢＴ／ＰＣ＝３／７） 本体部１の形成用混合樹脂として、ＰＢＴ／ＰＣの混合
比率が５／５の混合樹脂（ＰＢＴ／ＰＣポリマーアロ
イ、帝人株式会社製、商品名、Ｈ７５００）６０重量部
と、ＰＣ樹脂（帝人化成株式会社製、商品名、パンライ
トＫ−１３００）４０重量部とを混合し、ＰＢＴ／ＰＣ
の混合比率が３／７となるものを用いた以外は、実施例
１と同じ条件で図１に示した断面形状の光ファイバスペ
ーサを作成した。 Example 2 (PBT / PC = 3/7) As a mixed resin for forming the main body 1, a mixed resin having a PBT / PC mixing ratio of 5/5 (PBT / PC polymer alloy, manufactured by Teijin Ltd., 60 parts by weight of product name, H7500) and 40 parts by weight of PC resin (Teijin Kasei Co., Ltd., product name, Panlite K-1300) are mixed to obtain PBT / PC.
An optical fiber spacer having the cross-sectional shape shown in FIG. 1 was prepared under the same conditions as in Example 1 except that a mixture ratio of 3/7 was used.
【００２０】得られたスペーサに対して、実施例１と同
様に各種の物性試験を行い、その性能を確認した。この
試験の結果を図４に示している。実施例３ （ＰＢＴ／ＰＣ＝７／３） 本体部１の形成用混合樹脂として、実施例２と同様な方
法により、ＰＢＴ／ＰＣの混合比率が３／７となるもの
を作成し、この混合比率の混合合成樹脂を用いた以外
は、実施例１と同じ条件で図１に示した断面形状の光フ
ァイバスペーサを作成した。Various physical property tests were carried out on the obtained spacer in the same manner as in Example 1 to confirm its performance. The results of this test are shown in FIG. Example 3 (PBT / PC = 7/3) As the mixed resin for forming the main body 1, a mixture having a PBT / PC mixing ratio of 3/7 was prepared by the same method as in Example 2, and this mixed resin was prepared. An optical fiber spacer having the cross-sectional shape shown in FIG. 1 was prepared under the same conditions as in Example 1 except that a mixed synthetic resin having a ratio was used.
【００２１】得られたスペーサに対して、実施例１と同
様に各種の物性試験を行い、その性能を確認した。この
試験の結果を図４に示している。比較例１ （ＰＢＴ／ＰＣ＝８／２） 本体部１の形成用混合樹脂として、ＰＢＴ／ＰＣの混合
比率が５／５の混合樹脂（ＰＢＴ／ＰＣポリマーアロ
イ、帝人株式会社製、商品名、Ｈ７５００Ｎ）４０重量
部と、ＰＢＴ樹脂（帝人株式会社製、商品名、Ｃ７００
０Ｎ）６０重量部とを混合し、ＰＢＴ／ＰＣの混合比率
が８／２となるものを用いた以外は、実施例１と同じ条
件で図１に示した断面形状の光ファイバスペーサを作成
した。Various physical property tests were conducted on the obtained spacers in the same manner as in Example 1 to confirm the performance. The results of this test are shown in FIG. Comparative Example 1 (PBT / PC = 8/2) As a mixed resin for forming the main body 1, a mixed resin having a PBT / PC mixing ratio of 5/5 (PBT / PC polymer alloy, manufactured by Teijin Ltd., trade name, H7500N) 40 parts by weight and PBT resin (manufactured by Teijin Limited, trade name, C700
0N) 60 parts by weight was mixed, and an optical fiber spacer having a cross-sectional shape shown in FIG. 1 was prepared under the same conditions as in Example 1 except that a PBT / PC mixture ratio of 8/2 was used. .
【００２２】得られたスペーサに対して、実施例１と同
様に各種の物性試験を行い、その性能を確認した。この
試験の結果を図４に示している。比較例２ （ＰＢＴ／ＰＣ＝２／８） 本体部１の形成用混合樹脂として、ＰＢＴ／ＰＣの混合
比率が５／５の混合樹脂（ＰＢＴ／ＰＣポリマーアロ
イ、帝人株式会社製、商品名、Ｈ７５００）４０重量部
と、ＰＣ樹脂（帝人化成株式会社製、商品名、パンライ
トＫ−１３００）６０重量部とを混合し、ＰＢＴ／ＰＣ
の混合比率が８／２となるものを用いた以外は、実施例
１と同じ条件で図１に示した断面形状の光ファイバスペ
ーサを作成した。Various physical property tests were carried out on the obtained spacer in the same manner as in Example 1 to confirm its performance. The results of this test are shown in FIG. Comparative Example 2 (PBT / PC = 2/8) As a mixed resin for forming the main body 1, a mixed resin having a PBT / PC mixing ratio of 5/5 (PBT / PC polymer alloy, manufactured by Teijin Ltd., trade name, H7500) 40 parts by weight and PC resin (Teijin Kasei Co., Ltd., trade name, Panlite K-1300) 60 parts by weight are mixed to obtain PBT / PC.
An optical fiber spacer having the cross-sectional shape shown in FIG. 1 was prepared under the same conditions as in Example 1 except that a mixture ratio of 8/2 was used.
【００２３】得られたスペーサに対して、実施例１と同
様に各種の物性試験を行い、その性能を確認した。この
試験の結果を図４に示している。Various physical property tests were conducted on the obtained spacer in the same manner as in Example 1 to confirm its performance. The results of this test are shown in FIG.
【００２４】比較例３（ＨＤＰＥ） 本体部１の形成用樹脂として、ＨＤＰＥ樹脂（三井石油
化学株式会社製、商品名、Ｈｉｚｅｘ６３００Ｍ）を用
いた以外は、実施例１と同様な方法によりスペーサを作
成し、側圧試験などを行った。試験結果を図４に示して
いる。なお、この例では、リブ４ａ〜４ｅの根元部分の
厚みｌが０．４ｍｍであった。 Comparative Example 3 (HDPE) A spacer was prepared in the same manner as in Example 1 except that HDPE resin (trade name: Hizex6300M manufactured by Mitsui Petrochemical Co., Ltd.) was used as the resin for forming the main body 1. Then, a lateral pressure test was performed. The test results are shown in FIG. In addition, in this example, the thickness l of the root portions of the ribs 4a to 4e was 0.4 mm.
【００２５】比較例４（ＨＤＰＥ） 本体部１の形成用樹脂として、ＨＤＰＥ樹脂（三井石油
化学株式会社製、商品名、Ｈｉｚｅｘ６３００Ｍ）を用
いた以外は、実施例１と同様な方法によりスペーサを作
成し、側圧試験などを行った。試験結果を図４に示して
いる。なお、この例では、リブ４ａ〜４ｅの根元部分の
厚みｌが０．９ｍｍであった。 Comparative Example 4 (HDPE) A spacer was prepared in the same manner as in Example 1 except that HDPE resin (trade name: Hizex6300M manufactured by Mitsui Petrochemical Co., Ltd.) was used as the resin for forming the main body 1. Then, a lateral pressure test was performed. The test results are shown in FIG. In addition, in this example, the thickness 1 of the root portions of the ribs 4a to 4e was 0.9 mm.
【００２６】ここで、上記実施例および比較例で行った
試験の条件について説明する。 圧縮試験および側圧による伝送損失増の測定 長さが１００ｍｍのスペーサの溝２ａ〜２ｅの１つに８
心の光ファイバテープ心線５を５段収納し、これを図３
に示すようなロードセルに挟持し、５００ｋｇの荷重を
加えたときの歪み量（単位ｍｍ）と、荷重を除去した時
の歪み量（除荷後歪、単位ｍｍ）とを測定した。Here, the conditions of the tests conducted in the above-mentioned examples and comparative examples will be described. Compression test and measurement of transmission loss increase due to lateral pressure 8 in one of the grooves 2a to 2e of the spacer having a length of 100 mm.
The optical fiber tape core wire 5 of the core is stored in 5 stages, and this is shown in FIG.
The strain amount (unit: mm) when a load of 500 kg was applied, and the strain amount when the load was removed (strain after unloading, unit: mm) were measured by sandwiching the load cell as shown in FIG.
【００２７】また、伝送損失の測定は、５００ｋｇの荷
重を加えたときに、圧縮荷重の影響を受け易いＡ，Ｂ，
Ｃ，Ｄ（図２参照）の部位の光ファイバについて、波長
が１．５μｍにおける伝送損失増Δαを圧縮しながら測
定し、各測定個所におけるその最大値で評価した。The measurement of the transmission loss is such that when a load of 500 kg is applied, it is easily affected by the compressive load A, B,
The optical fibers at the portions C and D (see FIG. 2) were measured while compressing the transmission loss increase Δα at the wavelength of 1.5 μm, and evaluated by the maximum value at each measurement point.
【００２８】低温脆化温度 ＪＩＳ Ｋ−７２１６に準拠して行った。 表面粗さ 東京精密株式会社製の測定器サーフコム４７５Ａを用
い、カットオフ長０．８ｍｍで溝２ａ〜２ｅの底と側面
とを測定し、中心線平均粗さＲａで評価した。 環境応力亀裂試験 ＪＩＳ Ｋ ６７６０に準ずるようにして、非イオン系
の系の界面活性剤（ライオン株式会社製、商品名リポノ
ックスＮＣ−４００Ｆ）の１０％水溶液に、スペーサを
曲率半径１００ｍｍφに曲げた状態で５０℃で５００時
間浸漬し、スペーサの表面のクラック発生の有無を目視
により確認した。Low temperature embrittlement temperature It was performed in accordance with JIS K-7216. Surface Roughness Using a measuring instrument Surfcom 475A manufactured by Tokyo Seimitsu Co., Ltd., the bottom and side surfaces of the grooves 2a to 2e were measured with a cutoff length of 0.8 mm, and the centerline average roughness Ra was evaluated. Environmental stress crack test As in conformity with JIS K 6760, a spacer was bent to a radius of curvature of 100 mm in a 10% aqueous solution of a nonionic surfactant (Lion Co., Ltd., trade name Liponox NC-400F). In the state, it was immersed at 50 ° C. for 500 hours, and the presence or absence of cracks on the surface of the spacer was visually confirmed.
【００２９】なお、上記実施例では、溝２ａ〜２ｅ内に
光ファイバテープ心線５を収納した場合について説明し
たが溝２ａ〜２ｅ内には、光ファイバを直接収納するこ
ともできる。また、上記実施例では、本発明を螺旋状の
複数の溝２ａ〜２ｅが本体部１に一体に形成された光フ
ァイバ担持用スペーサに適用した場合を例示したが、本
発明の実施はこれに限定されることはなく、例えば、特
開平４−１４３７１０号公報，特開平４−１８２６０８
号公報，特開平４−７７１０９号公報，特開平４−２２
０６１２号公報，特開平４−３７２９１６号公報，特開
平５−１９１５１号公報，特開平４−１４３７１０号公
報，特開平４−１８２６０８号公報などに開示されてい
る光ファイバ収納溝を設けたスペーサやケーブルにも適
用することができる。In the above embodiment, the optical fiber ribbon 5 is stored in the grooves 2a to 2e. However, the optical fibers can be directly stored in the grooves 2a to 2e. Further, in the above-mentioned embodiment, the case where the present invention is applied to the spacer for carrying an optical fiber in which the plurality of spiral grooves 2a to 2e are integrally formed in the main body 1 is illustrated, but the present invention is not limited to this. There is no limitation. For example, JP-A-4-143710 and JP-A-4-182608.
Japanese Patent Laid-Open No. 4-77109, Japanese Patent Laid-Open No. 4-22
No. 0612, JP-A-4-372916, JP-A-5-19151, JP-A-4-143710, JP-A-4-182608, and other spacers provided with optical fiber storage grooves. It can also be applied to cables.
【００３０】[0030]
【発明の効果】図４に示した試験結果から明らかなよう
に、ポリブチレンテレフタレートとポリカーボネートと
の混合物から構成され、ポリブチレンテレフタレートと
ポリカーボネートとの混合比率を７／３〜３／７の範囲
内に設定した本発明にかかる合成樹脂製の光ファイバ担
持用スペーサによれば、低温特性と耐圧縮性に優れてい
ることが判り、このようなスペーサを用いると、海底光
ファイバケーブルとして好適なものとなるだけなく、従
来よりも光ファイバケーブルの高密度化が達成される。As is apparent from the test results shown in FIG. 4, it is composed of a mixture of polybutylene terephthalate and polycarbonate, and the mixing ratio of polybutylene terephthalate and polycarbonate is within the range of 7/3 to 3/7. It was found that the synthetic resin optical fiber carrying spacer according to the present invention set in (4) is excellent in low temperature characteristics and compression resistance, and such a spacer is suitable as a submarine optical fiber cable. In addition, the density of the optical fiber cable can be increased more than ever before.
【図１】本発明にかかる光ファイバ担持用スペーサの一
実施例を示す断面図である。FIG. 1 is a cross-sectional view showing an embodiment of an optical fiber carrying spacer according to the present invention.
【図２】図１のスペーサの溝に光ファイバテープ心線を
収納した状態の説明図である。FIG. 2 is an explanatory view showing a state in which an optical fiber tape core wire is housed in a groove of a spacer shown in FIG.
【図３】光ファイバ担持用スペーサの圧縮荷重試験の試
験状態の説明図である。FIG. 3 is an explanatory diagram of a test state of a compressive load test of a spacer for carrying an optical fiber.
【図４】本発明の実施例と比較例との各種物性試験の結
果を示す図表である。FIG. 4 is a chart showing the results of various physical property tests of Examples of the present invention and Comparative Examples.
１ 本体部 ２ａ〜２ｅ 溝 ３ 抗張力線 ４ａ〜４ｅ リブ 1 Main Body 2a-2e Groove 3 Tensile Strength Wire 4a-4e Rib
Claims (1)
納する溝が設けられた合成樹脂製の光ファイバ担持用ス
ペーサにおいて、 前記合成樹脂は、ポリブチレンテレフタレートとポリカ
ーボネートとの混合物から構成され、前記ポリブチレン
テレフタレートとポリカーボネートとの混合比率を７／
３〜３／７の範囲内に設定したことを特徴とする光ファ
イバ担持用スペーサ。1. A synthetic resin optical fiber carrying spacer provided with a groove for accommodating an optical fiber or an optical fiber tape, wherein the synthetic resin is composed of a mixture of polybutylene terephthalate and polycarbonate. The mixing ratio of terephthalate and polycarbonate is 7 /
An optical fiber carrying spacer characterized by being set within a range of 3 to 3/7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04779893A JP3642496B2 (en) | 1993-03-09 | 1993-03-09 | Optical fiber support spacer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04779893A JP3642496B2 (en) | 1993-03-09 | 1993-03-09 | Optical fiber support spacer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06258558A true JPH06258558A (en) | 1994-09-16 |
| JP3642496B2 JP3642496B2 (en) | 2005-04-27 |
Family
ID=12785395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04779893A Expired - Lifetime JP3642496B2 (en) | 1993-03-09 | 1993-03-09 | Optical fiber support spacer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3642496B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010191085A (en) * | 2009-02-17 | 2010-09-02 | Advanced Cable Systems Corp | Spacer for optical fiber cable and optical fiber cable having the same |
| CN104497519A (en) * | 2014-11-26 | 2015-04-08 | 苏州新区佳合塑胶有限公司 | Low-temperature-resistant light-duty plastic for seabed optical cable conjunction boxes |
-
1993
- 1993-03-09 JP JP04779893A patent/JP3642496B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010191085A (en) * | 2009-02-17 | 2010-09-02 | Advanced Cable Systems Corp | Spacer for optical fiber cable and optical fiber cable having the same |
| CN104497519A (en) * | 2014-11-26 | 2015-04-08 | 苏州新区佳合塑胶有限公司 | Low-temperature-resistant light-duty plastic for seabed optical cable conjunction boxes |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3642496B2 (en) | 2005-04-27 |
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