JP3568565B2 - Split optical fiber ribbon - Google Patents

Split optical fiber ribbon Download PDF

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Publication number
JP3568565B2
JP3568565B2 JP28316593A JP28316593A JP3568565B2 JP 3568565 B2 JP3568565 B2 JP 3568565B2 JP 28316593 A JP28316593 A JP 28316593A JP 28316593 A JP28316593 A JP 28316593A JP 3568565 B2 JP3568565 B2 JP 3568565B2
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Prior art keywords
optical fiber
fiber tape
parallel
protective coating
tape
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JPH07134230A (en
Inventor
直哉 井上
三男 伊藤
武男 塩野
敏訓 関
実 千葉
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昭和電線電纜株式会社
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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
    • G02B6/4403—Optical cables with ribbon structure
    • G02B6/4404—Multi-podded

Description

【０００１】
【産業上の利用分野】
本発明は、並列した複数の光ファイバ素線の外周に共通の保護被覆を設けた光ファイバテ−プ心線を、さらに複数本並列させて一体化し、必要に応じて各光ファイバテ−プ心線間を分割可能とした分割型光ファイバテ−プ心線に関する。
【０００２】
【従来の技術】
近年、加入者系における双方向伝送方式用光ファイバテープ心線として、図６に示すような、分割型光ファイバテ−プ心線が開発されている。
すなわち、この分割型光ファイバテ−プ心線は、並列した複数の光ファイバ素線１の外周に共通の保護被覆２を設けた光ファイバテ−プ心線３を、さらに複数本並列させ、これらの光ファイバテ−プ心線３間を紫外線硬化型樹脂（ＵＶ樹脂）などの結合材４で結合してテープ状に一体化し、結合材４に切れ目を入れた後に外力を加える等の操作により、使用時に必要に応じて光ファイバテ−プ心線３同士を分割することができるようにしたものである。
【０００３】
しかしながら、このような従来の分割型光ファイバテ−プ心線においては、光ファイバ素線３外周の共通の保護被覆２がほぼ等厚に形成されているため、光ファイバテ−プ心線３と結合材４との接触面積が光ファイバテ−プ心線３全体からみて小さく、このため光ファイバテ−プ心線３間の結合力が弱く、光ファイバテ−プ心線３同士が分割できるという本来の目的は達成されるものの、このような使用時の分岐処理に至る前、すなわち、ケーブル化の際にすでに光ファイバテ−プ心線３同士が捩れ等の応力を側方あるいは上下方向からうけて分割してしまうことがあった。
【０００４】
【発明が解決しようとする課題】
上述したように、従来構造の分割型光ファイバテ−プ心線においては、結合材と光ファイバテ−プ心線との接触面積が小さいため、光ファイバテ−プ心線間の結合力が弱く、このため不必要な心線分割が発生するおそれがあった。
【０００５】
本発明はこのような従来技術の課題に対処してなされたもので、必要時にのみ、すなわち意図した応力を加えたときにのみ隣接した光ファイバテ−プ心線同士の分割が可能な分割型光ファイバテ−プ心線を提供することを目的とする。
【０００６】
【課題を解決するための手段】
本発明は、並列した複数の光ファイバ素線の外周に共通の保護被覆を設けた光ファイバテ−プ心線を複数本並列させ、これらの各光ファイバテ−プ心線を該心線間の間隙に充填した結合材で結合してほぼ等厚のテープ状に成形してなる分割型光ファイバテ−プ心線において、前記各光ファイバテ−プ心線の互いに対向する縁部の厚さが中央部のそれより薄くなるように前記共通の保護被覆を形成したことを特徴としている。特に、この場合、前記各光ファイバテ−プ心線の共通の保護被覆がそれぞれの光ファイバ素線の配列方向と平行な少なくとも一つの平面部を有し、かつこれらの各平面部が同一平面をなすように前記各光ファイバテ−プ心線が並列されていることが好ましい。請求項２記載のものである。
【０００７】
【作用】
本発明の分割型光ファイバテ−プ心線においては、各光ファイバテ−プ心線の互いに対向する縁部の厚さが中央部のそれより薄くなるように、各光ファイバテ−プ心線における共通の保護被覆が形成されているので、各光ファイバテ−プ心線の結合材との接触面積が増し、隣接した光ファイバテ−プ心線同士の結合力が増大する。したがって、ケーブル化の際などに不必要な心線分割が生じることがなくなる。一方、ケーブル化の後、分岐処理を行う際など、必要時には、適度な外力を加えることにより所要の心線分割を行うことができる。
【０００８】
特に、各光ファイバテ−プ心線の共通の保護被覆がそれぞれの光ファイバ素線の配列方向と平行な少なくとも一つの平面部を有し、かつこれらの各平面部が同一平面をなすように各光ファイバテ−プ心線が並列されている場合には、光ファイバテープ心線の軸ずれの発生が防止され、各光ファイバ素線が同一平面上に並列した外観、特性に優れたものとなる。
【０００９】
【実施例】
以下、本発明の実施例を図面を用いて詳細に説明する。
図１は本発明の一実施例の分割型光ファイバテ−プ心線を示す断面図である。
図１において、この分割型光ファイバテ−プ心線は、並列する ２本の光ファイバ素線１１と、その周囲に施されたＵＶ樹脂等からなる共通の保護被覆１２とからなる ２心光ファイバテ−プ心線１３を ２本、各光ファイバ素線１１が同一平面上に位置するように並列させ、これらの ２心光ファイバテ−プ心線１３間に生じた凹部に結合材１４を、全体がほぼ等厚となるように充填して、 ２本の ２心光ファイバテ−プ心線１３間を結合するとともに、テープ状に成形して構成される。
そして、この実施例においては、上記各 ２心光ファイバテ−プ心線１３における共通の保護被覆１２の上側面および下側面が、それぞれ他の ２心光ファイバテ−プ心線１３と対向する側の端部に向けて徐々に厚さが薄くなるようなテーパ面１２ａで形成されている。
【００１０】
ここで、光ファイバテ−プ心線１３間に充填する結合材１４には、ＵＶ樹脂等、光ファイバテ−プ心線１３における共通の保護被覆１２を構成する材料と同様のものを用いることができるが、分割性の点から、共通の保護被覆１２を構成する材料よりヤング率の小さいものを使用することが望ましい。
【００１１】
このように構成される分割型光ファイバテ−プ心線においては、各光ファイバテ−プ心線１３と結合材１４との接触面積が、図６に示したような従来構造のものに比べて大きくなるため、光ファイバテ−プ心線１３間の結合力が増し、ケーブル化を行う際などに、光ファイバテ−プ心線１３の分割を生じることがなくなる。一方、ケーブル化の後、分岐処理などに際して心線分割の必要が生じた場合には、適度な外力を加えることにより、結合材１４の部分で左右に分割し、 ２本の光ファイバテ−プ心線１３とすることができる。
【００１２】
この分割型光ファイバテ−プ心線は、たとえば次のように製造される。
すなわち、まず図２に示すように、素線送出機１５から、 ４本の光ファイバ素線１１を ２本ずつ並列させて送り出し、それぞれ、連続的に第１のコーティングダイス１６ａ、１６ｂに通して、外周にＵＶ樹脂を被覆し、次いで、紫外線ランプ等の紫外線照射装置１７ａ、１７ｂにより紫外線を照射して、被覆したＵＶ樹脂をそれぞれ硬化させて光ファイバテープ心線１３とする。ここで第１のコーティングダイス１６ａ、１６ｂのダイス１８の形状は、図３に示すように、上下の幅を他の光ファイバテープ心線１３と対向する側に向けて徐々に狭くした形状とされており、このようなダイス１８を通して得られる光ファイバテープ心線１３は、図１で示したような、並列する ２本の光ファイバ素線１１の外周に、他の光ファイバテープ心線１３と対向する側の端部に向けて厚さが徐々に薄くなった形状の共通の保護被覆１２を有したものとなる。
【００１３】
次いで、これらの ２本の光ファイバテープ心線１３を並列させて第２のコーティングダイス１９に通し、光ファイバテ−プ心線２間の凹部に、全体がほぼ等厚となるように結合材１４としてＵＶ樹脂を充填した後、紫外線照射装置２０により充填したＵＶ樹脂を硬化させる。これにより、図１に示す分割型光ファイバファイバ心線が得られる。
【００１４】
以下、このような方法で製造した上記実施例の具体例を記載する。
【００１５】
用いた光ファイバ素線４の外径は ０．２５ｍｍ であり、これらの外周に被覆するＵＶ樹脂として、ヤング率が ６０ｋｇ／ｍｍ２ のアクリル・ウレタン系ＵＶ樹脂を用いた。また、光ファイバテ−プ心線１３間の凹部に充填するＵＶ樹脂として、ヤング率が ４０ｋｇ／ｍｍ２ のアクリル・ウレタン系ＵＶ樹脂を用いた。光ファイバテ−プ心線１３の外形寸法は、幅が約 ０．７ｍｍ、図１中ａで示す最大厚さが約 ０．４ｍｍ、図１中ｂで示す最小厚さが約 ０．２６ｍｍ であり、分割型光ファイバテ−プ心線全体の外形寸法は、幅が約 １．４ｍｍ、厚さが約 ０．４ｍｍであった。
【００１６】
作成した分割型光ファイバテ−プ心線について、光ファイバテ−プ心線間の結合力を測定し、従来構造の分割型光ファイバテ−プ心線、すなわち、共通の保護被覆を等厚に形成した以外は上記と同様にして作成した分割型光ファイバテ−プ心線のそれと比較したところ、実施例のものでは、結合力が ３ｇ であったのに対し、従来のものは １ｇ であった。なお、結合力の測定は９０°ピール試験法により行った。
【００１７】
次に、図４の断面図で示す本発明の他の実施例について説明する。なお、図１に共通する部分には同一符号を付して重複する説明を省略する。
この実施例では、各光ファイバテ−プ心線１３の共通の保護被覆１２が、並列する光ファイバ素線１１の下側面が、光ファイバ素線１１の配列方向と平行な平面１２ｂとされ、上側のみが、一側端側に向けて厚さが徐々に小さくなるようなテーパ面１２ａで形成されている。
【００１８】
このような実施例においては、上下にテーパ面１２ａが形成されている前述の実施例のものに比べ、製造時の光ファイバテープ心線１３の軸ずれの発生が防止されるため、光ファイバ素線が同一平面上に並列した外観、特性に優れたものとなる。一方、光ファイバテ−プ心線１３間の結合力はやや弱くなるものの、不必要な心線の分割を防止するに足る結合力を有しており、ケーブル化の際などに心線分割を発生するおそれはない。
【００１９】
なお、以上、説明した実施例は、いずれも本発明を、2心の光ファイバテ−プ心線を2本並列して一体化した構造の分割型光ファイバテ−プ心線に適用した例であるが、本発明はこのような実施例に限定されるものではなく、2心の光ファイバテ−プ心線を3本以上並列して一体化したものや、3心以上の光ファイバテ−プ心線を並列して一体化したものにも適用して、同様の効果を得ることができる。図５（ａ）〜（ｃ）は、このような例を示したものである。なお、この図においても、図１に共通する部分には同一符号を付してあり、１１は光ファイバ素線、１２は共通の保護被覆、１３は光ファイバテープ心線、１４は結合材である。
【００２０】
【発明の効果】
以上説明したように、本発明の分割型光ファイバテ−プ心線は、並列する各光ファイバテ−プ心線の互いに対向する縁部の厚さが中央部のそれより薄くなるように、それぞれの共通の保護被覆が形成されているので、光ファイバテ−プ心線間を結合する結合材と各光ファイバテ−プ心線との接触面積が増し、光ファイバテ−プ心線間の結合力が増大する。したがって、ケーブル化の際などにおける不必要な心線分割を防止することができ、必要時にのみ、光ファイバテ−プ心線同士の分割を行うことができる。
【００２１】
また、ここで、各光ファイバテ−プ心線の共通の保護被覆がそれぞれの光ファイバ素線の配列方向と平行な少なくとも一つの平面部を有し、かつこれらの各平面部が同一平面をなすように各光ファイバテ−プ心線が並列されているようにした場合には、製造時における光ファイバテープ心線の軸ずれが防止され、光ファイバ素線が同一平面上に並列した、外観、特性ともに優れたものが安定して得られる。
【図面の簡単な説明】
【図１】本発明の分割型光ファイバテ−プ心線の一実施例を示す断面図。
【図２】図１に示した分割型光ファイバテ−プ心線の製造工程図。
【図３】図２に示したコーティングダイスのダイスの形状を示す図。
【図４】本発明の他の実施例を示す断面図。
【図５】本発明のさらに他の実施例を示す断面図。
【図６】従来の分割型光ファイバテ−プ心線の一例を示す断面図。
【符号の説明】
１１………光ファイバ素線
１２………共通の保護被覆
１２ａ………テーパ面
１２ｂ………平面
１３………光ファイバテ−プ心線
１４………結合材[0001]
[Industrial applications]
According to the present invention, a plurality of optical fiber tapes provided with a common protective coating on the outer periphery of a plurality of parallel optical fiber wires are further integrated in parallel to form a plurality of optical fiber tapes as necessary. The present invention relates to a split type optical fiber tape capable of dividing the space.
[0002]
[Prior art]
In recent years, a split type optical fiber tape as shown in FIG. 6 has been developed as an optical fiber tape for a bidirectional transmission system in a subscriber system.
That is, in the split type optical fiber tape, a plurality of optical fiber tapes 3 provided with a common protective coating 2 on the outer periphery of a plurality of parallel optical fiber strands 1 are further arranged in parallel. The optical fiber tape cores 3 are connected by a bonding material 4 such as an ultraviolet-curing resin (UV resin) and integrated into a tape shape, and after being cut into the bonding material 4, an external force is applied and the like. At times, the optical fiber tape cores 3 can be divided as needed.
[0003]
However, in such a conventional split-type optical fiber tape, the common protective coating 2 on the outer periphery of the optical fiber 3 is formed to have substantially the same thickness, so that it is coupled to the optical fiber tape 3. The contact area with the material 4 is small when viewed from the whole optical fiber tape core 3, so that the coupling force between the optical fiber tape cores 3 is weak, and the optical fiber tape cores 3 can be separated from each other. Is achieved, but before the branching process at the time of use, that is, when the optical fiber tape cores 3 are already cabled, the optical fiber tape cores 3 are divided by receiving stress such as torsion from the side or the vertical direction. Sometimes happened.
[0004]
[Problems to be solved by the invention]
As described above, in the conventional split type optical fiber ribbon, the contact area between the bonding material and the optical fiber ribbon is small, so that the coupling force between the optical fiber ribbons is weak. Therefore, there is a possibility that unnecessary division of the cords may occur.
[0005]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and a split type optical fiber capable of splitting adjacent optical fiber tape cores only when necessary, that is, only when an intended stress is applied. It is an object to provide a fiber tape.
[0006]
[Means for Solving the Problems]
According to the present invention, a plurality of optical fiber tape cores provided with a common protective coating on the outer periphery of a plurality of parallel optical fiber strands are arranged in parallel, and each of these optical fiber tape cores is inserted into a gap between the optical fibers. In the split-type optical fiber ribbons formed by joining with a bonding material filled into the tape and forming into a tape shape having substantially the same thickness, the thickness of the opposing edges of each of the optical fiber ribbons is set at the center. The common protective coating is formed so as to be thinner than the above. In particular, in this case, the common protective coating of each of the optical fiber tapes has at least one flat portion parallel to the arrangement direction of the respective optical fiber wires, and each of the flat portions has the same flat surface. Preferably, the optical fiber tapes are arranged in parallel. According to claim 2.
[0007]
[Action]
In the split-type optical fiber ribbon according to the present invention, the common optical fiber tape is used so that the mutually opposing edges of the optical fiber ribbon are thinner than those at the center. Is formed, the contact area of each optical fiber tape core with the bonding material increases, and the bonding strength between adjacent optical fiber tape cores increases. Therefore, unnecessary core division does not occur when a cable is used. On the other hand, when necessary, for example, when branching processing is performed after the cable is formed, a required core can be divided by applying an appropriate external force.
[0008]
In particular, the common protective coating of each optical fiber tape has at least one flat portion parallel to the arrangement direction of each optical fiber strand, and each flat portion is coplanar. When the optical fiber tape cores are arranged side by side, the occurrence of axial misalignment of the optical fiber tape cores is prevented, and the appearance and characteristics of the individual optical fiber strands arranged on the same plane are excellent. .
[0009]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a sectional view showing a split type optical fiber tape according to an embodiment of the present invention.
In FIG. 1, the split type optical fiber tape is composed of two parallel optical fiber wires 11 and a common protective coating 12 made of UV resin or the like provided around the optical fiber wires. Two optical fibers 13 are arranged in parallel so that each optical fiber 11 is located on the same plane, and a coupling material 14 is entirely inserted into a concave portion formed between these optical fibers 13. Are formed so as to have substantially the same thickness, and the two two-core optical fiber tape cores 13 are connected to each other and formed into a tape shape.
In this embodiment, the upper surface and the lower surface of the common protective coating 12 in each of the above-mentioned two-core optical fiber ribbons 13 are on the side facing the other two-core optical fiber ribbon 13 respectively. It is formed of a tapered surface 12a whose thickness gradually decreases toward the end.
[0010]
Here, as the bonding material 14 filled between the optical fiber tape cores 13, the same material as the material forming the common protective coating 12 on the optical fiber tape cores 13, such as UV resin, can be used. However, it is desirable to use a material having a Young's modulus smaller than that of the material forming the common protective coating 12 from the viewpoint of division.
[0011]
In the split type optical fiber ribbon thus constructed, the contact area between each optical fiber ribbon 13 and the coupling material 14 is larger than that of the conventional structure as shown in FIG. Therefore, the coupling force between the optical fiber tape cores 13 is increased, so that the optical fiber tape cores 13 are not divided when a cable is formed. On the other hand, if it becomes necessary to divide the core wire at the time of branching after the cable is formed, an appropriate external force is applied to divide the cable into right and left portions at the coupling material 14 to form two optical fiber tape cores. It can be line 13.
[0012]
The split type optical fiber tape is manufactured, for example, as follows.
That is, first, as shown in FIG. 2, four optical fiber wires 11 are sent out from the wire feeder 15 in parallel two by two, and each of them is continuously passed through the first coating dies 16a and 16b. Then, the outer periphery is coated with a UV resin, and then the coated UV resin is irradiated with ultraviolet rays by ultraviolet irradiation devices 17a and 17b such as an ultraviolet lamp to cure the coated UV resin, thereby forming the optical fiber ribbon 13. Here, the shape of the dies 18 of the first coating dies 16a and 16b is such that the upper and lower widths are gradually narrowed toward the side facing the other optical fiber ribbon 13 as shown in FIG. The optical fiber ribbon 13 obtained through such a dice 18 has the outer circumference of two parallel optical fiber strands 11 as shown in FIG. The common protective coating 12 has a shape whose thickness gradually decreases toward the end on the opposite side.
[0013]
Next, these two optical fiber tape cores 13 are passed in parallel through a second coating die 19, and are inserted into the concave portions between the optical fiber tape cores 2 so that the entire thickness of the bonding material 14 is substantially equal. After filling the UV resin, the UV resin filled by the ultraviolet irradiation device 20 is cured. Thus, the split optical fiber core shown in FIG. 1 is obtained.
[0014]
Hereinafter, specific examples of the above embodiment manufactured by such a method will be described.
[0015]
The outer diameter of the used optical fiber wire 4 was 0.25 mm, and an acrylic / urethane UV resin having a Young's modulus of 60 kg / mm 2 was used as a UV resin covering the outer circumference of the optical fiber. An acrylic / urethane-based UV resin having a Young's modulus of 40 kg / mm 2 was used as the UV resin to be filled in the concave portions between the optical fiber tape cores 13. The outer dimensions of the optical fiber tape core 13 are about 0.7 mm in width, the maximum thickness shown in FIG. 1A is about 0.4 mm, and the minimum thickness shown in FIG. 1B is about 0.26 mm. The overall dimensions of the split optical fiber tape core were about 1.4 mm in width and about 0.4 mm in thickness.
[0016]
With respect to the prepared split type optical fiber tape, the coupling force between the optical fiber tapes was measured, and a split type optical fiber tape having a conventional structure, that is, a common protective coating was formed with an equal thickness. A comparison was made with that of the split optical fiber ribbon prepared in the same manner as above except that the bonding strength of the example was 3 g, whereas that of the conventional one was 1 g. The measurement of the bonding force was performed by a 90 ° peel test method.
[0017]
Next, another embodiment of the present invention shown in the sectional view of FIG. 4 will be described. In addition, the same reference numerals are given to portions common to FIG.
In this embodiment, the common protective coating 12 of each optical fiber tape core 13 is such that the lower surface of the parallel optical fiber 11 is a flat surface 12 b parallel to the arrangement direction of the optical fiber 11, Only one is formed of a tapered surface 12a whose thickness gradually decreases toward one end.
[0018]
In this embodiment, as compared with the above-described embodiment in which the upper and lower tapered surfaces 12a are formed, the occurrence of the axial deviation of the optical fiber ribbon 13 at the time of manufacturing is prevented. The appearance and characteristics of the lines arranged in parallel on the same plane are excellent. On the other hand, although the coupling force between the optical fiber tapes 13 is slightly weakened, it has a coupling force sufficient to prevent unnecessary division of the core fiber, and the core division occurs when a cable is used. There is no danger.
[0019]
The embodiments described above are all examples in which the present invention is applied to a split-type optical fiber tape having a structure in which two optical fiber tapes are integrated in parallel. However, the present invention is not limited to such an embodiment, and three or more optical fiber tapes are integrated in parallel, or three or more optical fiber tapes. The same effects can be obtained by applying the present invention to a device in which the components are integrated in parallel. Figure 5 (a) ~ (c) is a diagram showing such an example. Also in this figure, the same reference numerals are given to the parts common to FIG. 1, 11 is an optical fiber, 12 is a common protective coating, 13 is an optical fiber tape, and 14 is a bonding material. is there.
[0020]
【The invention's effect】
As described above, the split-type optical fiber ribbons of the present invention have respective optical fiber tapes arranged in parallel such that the opposing edges of the respective optical fiber tapes are thinner than the central portion. Since the common protective coating is formed, the contact area between the bonding material for connecting the optical fiber tape cores and each optical fiber tape core increases, and the coupling force between the optical fiber tape cores increases. I do. Therefore, it is possible to prevent unnecessary division of the core fiber at the time of conversion into a cable or the like, and it is possible to divide the optical fiber tape cores only when necessary.
[0021]
Here, the common protective coating of each optical fiber tape has at least one flat portion parallel to the arrangement direction of each optical fiber strand, and these flat portions form the same plane. When the optical fiber tapes are arranged in parallel as described above, the axis deviation of the optical fiber tape at the time of manufacturing is prevented, and the optical fibers are arranged on the same plane. Those having excellent characteristics can be stably obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing one embodiment of a split type optical fiber tape according to the present invention.
FIG. 2 is a manufacturing process diagram of the split optical fiber tape shown in FIG. 1;
FIG. 3 is a view showing a shape of a die of the coating die shown in FIG. 2;
FIG. 4 is a sectional view showing another embodiment of the present invention.
FIG. 5 is a sectional view showing still another embodiment of the present invention.
FIG. 6 is a sectional view showing an example of a conventional split-type optical fiber tape.
[Explanation of symbols]
11: Optical fiber 12: Common protective coating 12a: Tapered surface 12b: Flat surface 13: Optical fiber tape core 14: Bonding material

Claims (2)

並列した複数の光ファイバ素線の外周に共通の保護被覆を設けた光ファイバテ−プ心線を複数本並列させ、これらの各光ファイバテ−プ心線を該心線間の間隙に充填した結合材で結合してほぼ等厚のテープ状に成形してなる分割型光ファイバテ−プ心線において、
前記各光ファイバテ−プ心線の互いに対向する縁部の厚さが中央部のそれより薄くなるように前記共通の保護被覆を形成したことを特徴とする分割型光ファイバテ−プ心線。A connection in which a plurality of optical fiber tape cores provided with a common protective coating on the outer periphery of a plurality of parallel optical fiber strands are juxtaposed, and each of these optical fiber tape cores is filled in a gap between the cores. In a split type optical fiber tape core formed by joining together with materials and forming into an approximately equal thickness tape,
2. The split type optical fiber tape according to claim 1, wherein said common protective coating is formed so that edges of said optical fiber tapes facing each other are thinner than that of a central portion. 請求項１記載の分割型光ファイバテ−プ心線において、前記各光ファイバテ−プ心線の共通の保護被覆がそれぞれの光ファイバ素線の配列方向と平行な少なくとも一つの平面部を有し、かつこれらの各平面部が同一平面をなすように前記各光ファイバテ−プ心線が並列されていることを特徴とする分割型光ファイバテ−プ心線。2. A split type optical fiber tape according to claim 1, wherein the common protective coating of each of the optical fiber tapes has at least one flat portion parallel to a direction in which the optical fibers are arranged. The split type optical fiber tape is characterized in that the respective optical fiber tapes are arranged in parallel such that the respective plane portions are on the same plane.
JP28316593A 1993-11-12 1993-11-12 Split optical fiber ribbon Expired - Lifetime JP3568565B2 (en)

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Application Number Priority Date Filing Date Title
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JP3568565B2 true JP3568565B2 (en) 2004-09-22

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US7509009B2 (en) 2005-03-23 2009-03-24 Tomoegawa Paper Co., Ltd Optical fiber structure and method of manufacturing same

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