JP2525020B2 - Optical fiber tape - Google Patents
Optical fiber tapeInfo
- Publication number
- JP2525020B2 JP2525020B2 JP62311609A JP31160987A JP2525020B2 JP 2525020 B2 JP2525020 B2 JP 2525020B2 JP 62311609 A JP62311609 A JP 62311609A JP 31160987 A JP31160987 A JP 31160987A JP 2525020 B2 JP2525020 B2 JP 2525020B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- core wire
- group
- coating
- ultraviolet
- 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 - Lifetime
Links
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Description
【発明の詳細な説明】 〔技術分野〕 本発明は複数本の光フアイバ心線を平面状に並行に並
べ、これに一括被覆を施して成る光フアイバテープ心線
に関するものである。Description: TECHNICAL FIELD The present invention relates to an optical fiber tape core wire formed by arranging a plurality of optical fiber core wires in parallel in a plane and collectively coating the fibers.
近年、光フアイバケーブルが加入者系に布設されるに
至り、低コスト化が大きな課題になってきた。その低コ
ストな光フアイバ心線として現在注目されているものに
第１図に示す構造のものがある。これはコア及びクラッ
ドから成る光フアイバ１に適当な被覆、例えば比較的軟
質の内層被覆２及び前記内層被覆２より硬質の外層被覆
３等を有し、かつ識別用に前記外層被覆３上に着色層４
が設けられた光フアイバ心線５を複数本用意し、これを
平面状に並行に並べ、さらに一括被覆６を施したもの
で、一般に光フアイバテープ心線と呼ばれている。通常
この光フアイバテープ心線を複数枚積層させてケーブル
を構成し、加入者用光ケーブルに供している。In recent years, optical fiber cables have been installed in subscriber systems, and cost reduction has become a major issue. As the low-cost optical fiber core wire, there is one having a structure shown in FIG. 1 at present. It has a suitable coating on the optical fiber 1 consisting of a core and a clad, for example a relatively soft inner layer coating 2 and an outer layer coating 3 which is harder than said inner layer coating 2 and is colored on said outer layer coating 3 for identification. Layer 4
A plurality of optical fiber core wires 5 provided with are prepared, arranged in parallel in a plane, and further collectively coated 6, and are generally called optical fiber tape core wires. Usually, a plurality of optical fiber ribbons are laminated to form a cable, which is used as an optical cable for subscribers.
前記光フアイバテープ心線が低コスト化になぜ寄与す
るかというと、その大きな理由は接続が複数本一括して
行なえる等の利点を有しているためである。The reason why the optical fiber tape core wire contributes to the cost reduction is largely because it has an advantage that a plurality of connections can be collectively made.
そこで今日では、前記光フアイバテープ心線を主流に
して、該光フアイバテープ心線をいかに低コスト化する
かが大きな課題となっている。Therefore, nowadays, how to reduce the cost of the optical fiber tape core wire by making the optical fiber tape core wire the mainstream is a major issue.
さて、この光フアイバテープ心線を低コスト化する一
手段として、前記光フアイバテープ心線５の各被覆２、
３及び一括被覆６を紫外線硬化型樹脂にて形成し、被覆
の硬化速度を上げることにより製造コストの低減を図る
方法があり、今日ではこれが主流になってきている。ま
た着色層４を施す方法にも外層被覆３の材料の中に着色
材を予め混入しておいて、外層被覆３自体に着色層４の
役目を兼ねさせる方法と、外層被覆３上に別に着色層４
を設ける方法と２通りがあるが、前者の場合、外層被覆
材に着色材を混ぜることにより紫外線硬化型樹脂から成
る外層被覆３の紫外線による硬化速度が極度に落ち、製
造効率が悪くなることから後者の方法が主として採用さ
れている。Now, as a means for reducing the cost of the optical fiber tape core wire, each coating 2 of the optical fiber tape core wire 5,
There is a method of reducing the manufacturing cost by forming the 3 and the collective coating 6 with an ultraviolet curable resin and increasing the curing speed of the coating, and this is becoming the mainstream today. In addition, in the method of applying the coloring layer 4, a coloring material is mixed in advance in the material of the outer layer coating 3 so that the outer layer coating 3 itself also serves as the coloring layer 4, and the coloring is separately performed on the outer layer coating 3. Layer 4
There are two methods for providing the above. In the former case, mixing the outer coating material with the coloring material causes the curing rate of the outer coating 3 made of the ultraviolet curable resin by the ultraviolet rays to be extremely reduced, resulting in poor production efficiency. The latter method is mainly adopted.
ところでこのように紫外線硬化型樹脂から成る各被覆
２、３や一括被覆６を有する光フアイバテープ心線にあ
っては、多心一括接続の場合は問題とならないが時とし
て起こり得る分岐接続の場合、すなわち第１図に示す複
数心の光フアイバテープ心線からその一部の光フアイバ
心線５を分離して取り出して接続しようとする場合、一
括被覆６から光フアイバ心線５を簡単に分離できないと
いう問題が発生してきた。その結果分岐接続の場合は一
括接続の容易さとは裏腹に接続作業に時間がかかり過ぎ
るという問題が出てきた。By the way, in the case of the optical fiber tape core wire having the respective coatings 2 and 3 and the collective coating 6 made of the ultraviolet curable resin as described above, there is no problem in the case of the multi-core collective connection, but in the case of the branch connection which may sometimes occur. That is, when the optical fiber ribbons 5 of a plurality of fibers shown in FIG. 1 are partially separated and taken out for connection, the optical fiber ribbons 5 can be easily separated from the collective coating 6. There is a problem that I can not do it. As a result, in the case of branch connection, contrary to the ease of batch connection, there is a problem that the connection work takes too much time.
前記問題に鑑み本発明の目的は、光フアイバテープ心
線を分岐接続する場合、テープ心線から単心線を容易に
分離でき、もって接続作業が簡単な光フアイバテープ心
線を提供することにある。In view of the above problems, an object of the present invention is to provide an optical fiber tape core wire that can easily separate a single core wire from the tape core wire when branching and connecting the optical fiber tape core wire, and thus the connection work is easy. is there.
前記目的を達成すべく本発明は、最外層に着色層を有
する紫外線硬化型樹脂被覆光フアイバ心線を複数本平面
状に並行に並べ、これに紫外線硬化型樹脂から成る一括
被覆を施して成る光フアイバテープ心線において、前記
着色層は分子中に官能基を有する有機ポリシロキサン化
合物を１重量％〜10重量％含有し、かつそのゲル分率が
90％以上である紫外線硬化型アクリレートから成ること
を特徴とするものである。To achieve the above object, the present invention comprises a plurality of UV-curable resin-coated optical fiber core wires having a colored layer as the outermost layer, which are arranged in parallel in a plane, and which are collectively coated with a UV-curable resin. In the optical fiber tape core wire, the colored layer contains 1% to 10% by weight of an organic polysiloxane compound having a functional group in the molecule, and the gel fraction thereof is
It is characterized by comprising 90% or more of an ultraviolet curable acrylate.
以下に本発明の実施例を詳細に説明する。本発明者は
第１図に示す光フアイバテープ心線、すなわち光フアイ
バ１の周りに紫外線硬化型樹脂から成る内層被覆２及び
該内層被覆２よりは硬くかつ紫外線硬化型樹脂から成る
外層被覆３が設けられ、かつ外層被覆３上に着色層４を
有する複数本の光フアイバテープ心線５を平面状に並行
に並べ、これに紫外線硬化型樹脂から成る一括被覆６を
有する光フアイバテープ心線において、いかにして光フ
アイバ心線５を一括被覆６から簡単に分離できるかを種
々検討した。その結果、着色層４の材料として分子中に
官能基を有する有機ポリシロキサン化合物を１重量％〜
10重量％含有し、かつそのゲル分率が90％以上である紫
外線硬化型アクリレートを使用すると、前記分離性が格
段に向上することを見出した。尚、ここでいう有機ポリ
シロキサン化合物とは、分子中にビニル基、アクリル
基、ヒドロキシル基、カルボキシル基、アミノ基または
メルカプト基のいずれかの官能基を持つものであれば良
い。その理由は、例えばビニル基を有する有機ポリシロ
キサン化合物であると、硬化の際にポリシロキサン化合
物が主鎖の中に組み込まれることになる。また例えばヒ
ドロキシル基を有する有機ポリシロキサン化合物である
と、主成分であるアクリレート中のアクリル基と活性水
素が水素結合等の相互作用を持つため有機ポリシロキサ
ン化合物が長期にわたって安定に着色層４内に存在し、
安定した分離性（剥離性）が得られるものと推測され
る。Hereinafter, examples of the present invention will be described in detail. The inventor of the present invention has shown that an optical fiber tape core wire shown in FIG. 1, that is, an inner layer coating 2 made of an ultraviolet curable resin and an outer layer coating 3 harder than the inner layer coating 2 and made of an ultraviolet curable resin are provided around the optical fiber 1. In an optical fiber tape core wire provided with a plurality of optical fiber tape core wires 5 having a colored layer 4 on the outer layer coating 3 and arranged in parallel in a plane, and having a collective coating 6 made of an ultraviolet curable resin. Then, various studies have been made on how the optical fiber core wire 5 can be easily separated from the collective coating 6. As a result, an organic polysiloxane compound having a functional group in the molecule as a material for the colored layer 4 is 1% by weight to
It was found that the use of an ultraviolet-curable acrylate containing 10% by weight and having a gel fraction of 90% or more markedly improves the separability. It should be noted that the organic polysiloxane compound referred to here may be one having a functional group of any one of vinyl group, acryl group, hydroxyl group, carboxyl group, amino group or mercapto group in the molecule. The reason is that, for example, in the case of an organic polysiloxane compound having a vinyl group, the polysiloxane compound is incorporated into the main chain during curing. Further, for example, in the case of an organic polysiloxane compound having a hydroxyl group, the acrylic group in the acrylate as the main component and active hydrogen have an interaction such as a hydrogen bond, so that the organic polysiloxane compound is stably contained in the colored layer 4 for a long period of time. Exists,
It is presumed that stable separability (peelability) can be obtained.
次ぎに前記紫外線硬化型アクリレートが含有する分子
中に官能基を有する有機ポリシロキサン化合物の含有量
を１重量％〜10重量％に限定する理由は、１重量％未満
であると着色層４と一括被覆６とが接着したままになっ
て、剥離効果が現れず、一方10重量％を越えると紫外線
硬化型アクリレートへの有機ポリシロキサン化合物の相
溶性が悪化して相分離が起こってしまうためである。Next, the reason for limiting the content of the organopolysiloxane compound having a functional group in the molecule contained in the UV-curable acrylate to 1% by weight to 10% by weight is that if the amount is less than 1% by weight, the coloring layer 4 and the coloring layer 4 are packaged together. This is because the coating 6 remains adhered and the peeling effect does not appear. On the other hand, if it exceeds 10% by weight, the compatibility of the organic polysiloxane compound with the UV-curable acrylate deteriorates and phase separation occurs. .
またゲル分率を90％以上と限定したのは、90％未満で
あると光フアイバ心線５と一括被覆６との剥離性が悪い
ためで、その理由は一括被覆６が紫外線照射により硬化
する際に、着色層４の未硬化の部分が前記一括被覆６と
架橋を形成するためではないかと推測する。尚、紫外線
硬化型アクリレートのゲル分率は10mJ/cm2の紫外線を照
射した厚さ５μｍのシートサンプルをメチルエチルケト
ンを溶媒とし、ソックスレー抽出を12時間行って測定し
たものである。The reason why the gel fraction is limited to 90% or more is that if it is less than 90%, the releasability between the optical fiber core wire 5 and the collective coating 6 is poor. The reason is that the collective coating 6 is cured by irradiation of ultraviolet rays. At this time, it is presumed that the uncured portion of the colored layer 4 forms crosslinks with the collective coating 6. The gel fraction of the UV-curable acrylate was measured by subjecting a sheet sample having a thickness of 5 μm irradiated with UV of 10 mJ / cm 2 to a solvent of methyl ethyl ketone for Soxhlet extraction for 12 hours.
以下の本発明の実施例を比較例と共に示す。 The following examples of the present invention will be shown together with comparative examples.
（実施例） 紫外線硬化型樹脂から成る外層被覆３を施して成る外
径250μｍの光フアイバ心線の外表面に線速200m/minで
厚さ５μｍの着色層４を施した。このときの着色層４の
材料は、分子中に官能基としてヒドロキシル基を有する
有機ポリシロキサン化合物を３重量％含んだ紫外線硬化
型アクリレート（ゲル分率91％）である。また硬化に使
用した紫外線照射装置は120W/cmのメタルハライドラン
プ２灯油している。(Example) A colored layer 4 having a thickness of 5 μm was applied at a linear velocity of 200 m / min to the outer surface of an optical fiber core wire having an outer diameter of 250 μm formed by applying the outer layer coating 3 made of an ultraviolet curable resin. The material of the colored layer 4 at this time is an ultraviolet-curable acrylate (gel fraction 91%) containing 3% by weight of an organic polysiloxane compound having a hydroxyl group as a functional group in the molecule. The UV irradiation device used for curing uses two kerosene 120W / cm metal halide lamps.
このようにして製造した着色層４付の紫外線硬化型樹
脂被覆光フアイバ心線５を４本、平面状に並行に並べ、
これに紫外線硬化型ウレタンアクリレート樹脂（硬化後
のヤング率が60kgf/mm2）から成る一括被覆６を被覆し
硬化せしめ、幅1.1mm、厚さ0.4mmの４心の光フアイバテ
ープ心線を得た。The four UV-curable resin-coated optical fiber core wires 5 with the colored layers 4 thus manufactured are arranged in parallel in a plane.
This was coated with a collective coating 6 made of UV-curable urethane acrylate resin (Young's modulus after curing was 60 kgf / mm 2 ) and cured to obtain a 4-fiber optical fiber ribbon with a width of 1.1 mm and a thickness of 0.4 mm. It was
この光フアイバテープ心線の端末において、前記一括
被覆６を端末から約1m剥ぎ取ったところ、容易に光フア
イバ心線５を１心毎に分離でき、各光フアイバ心線５の
着色層４上には一括被覆６は残存物は一切残っていず、
極めて分離性が良好であった。In this end of the optical fiber tape core wire, when the collective coating 6 is peeled off from the end by about 1 m, the optical fiber core wire 5 can be easily separated for each core, and on the colored layer 4 of each optical fiber core wire 5. The batch coating 6 has no residue left at all,
The separability was extremely good.
（比較例） 前記実施例と同じ紫外線硬化型樹脂から成る外層被覆
３を有する同サイズの光フアイバ心線を用意し、これに
線速200m/minで厚さ５μｍの着色層４を施した。このと
きの着色層４の材料は、分子中に官能基としてヒドロキ
シル基を有する有機ポリシロキサン化合物を３重量％含
んだ紫外線硬化型アクリレート（ゲル分率88％）であ
る。また硬化に使用した紫外線照射装置も前記実施例の
ものと同じである。(Comparative Example) An optical fiber core wire of the same size having an outer layer coating 3 made of the same UV-curable resin as that of the above-described example was prepared, and a colored layer 4 having a thickness of 5 μm was applied thereto at a linear velocity of 200 m / min. The material of the colored layer 4 at this time is an ultraviolet-curable acrylate (gel fraction 88%) containing 3% by weight of an organic polysiloxane compound having a hydroxyl group as a functional group in the molecule. The ultraviolet irradiation device used for curing is also the same as that used in the above embodiment.
このようにして製造した着色層４付の紫外線硬化型樹
脂被覆光フアイバ心線５を４本を用い、前記実施例と同
様にして同サイズの光フアイバテープ心線を得た。Using four UV-curable resin-coated optical fiber cords 5 with the colored layer 4 thus produced, optical fiber tape cords of the same size were obtained in the same manner as in the above example.
得られた光フアイバテープ心線の端末において、前記
一括被覆６を端末から約1m剥ぎ取ったところ、なんとか
各光フアイバ心線５を１心毎に分離できたものの、各光
フアイバ心線５の表面には相当量一括被覆６の残存物が
付着しており、この残存物を除去するのは容易でなかっ
た。In the end of the obtained optical fiber ribbon, when the collective coating 6 was peeled off from the end by about 1 m, each optical fiber 5 could be separated one by one, but A considerable amount of the residue of the collective coating 6 adhered to the surface, and it was not easy to remove this residue.
以上のように本発明の光フアイバテープ心線によれ
ば、該テープ心線から数本の単心線を分岐接続する事態
が生じても、一括被覆から所定の単心線を容易に分離で
き、もって接続作業が簡単に行なえるという利点を有す
る。As described above, according to the optical fiber tape core wire of the present invention, even if a situation occurs in which several single core wires are branched from the tape core wire, a predetermined single core wire can be easily separated from the collective coating. Therefore, there is an advantage that connection work can be easily performed.
尚、前記実施例では光フアイバ心線として紫外線硬化
型樹脂から成る二層の被覆を有するものについてのみ述
べたが、着色層の内側の紫外線硬化型樹脂から成る被覆
は何層でも本発明の光フアイバテープ心線に適用でき
る。さらに紫外線硬化型樹脂から成る一括被覆について
も、本実施例では一層のものについて述べているが、何
層であっても同様の効果を期待できる。Incidentally, in the above-mentioned embodiment, only the optical fiber core having a two-layer coating made of an ultraviolet-curing resin was described, but any number of coating layers made of the ultraviolet-curing resin on the inner side of the colored layer can be used for the optical fiber of the present invention. Applicable to fiber tape core wire. Further, in the present embodiment, a single layer coating of an ultraviolet curable resin is described, but the same effect can be expected regardless of the number of layers.
前述の如く本発明によれば、端末での単心線分離が容
易であって、それ故分岐接続の容易な光フアイバテープ
心線を得ることができる。As described above, according to the present invention, it is possible to obtain an optical fiber ribbon which is easy to separate single fibers at a terminal and therefore easy to branch and connect.
第１図は光フアイバテープ心線の一例を示す横断面図で
ある。 １……光フアイバ、２……内層被覆、３……外装被覆、
４……着色層、５……光フアイバ心線、６……一括被覆FIG. 1 is a cross-sectional view showing an example of an optical fiber ribbon core wire. 1 ... Optical fiber, 2 ... Inner layer coating, 3 ... Exterior coating,
4 ... Colored layer, 5 ... Optical fiber core, 6 ... Collective coating
Claims (2)
被覆光フアイバ心線を複数本平面状に並行に並べ、これ
に紫外線硬化型樹脂から成る一括被覆を施して成る光フ
アイバテープ心線において、前記着色層は分子中に官能
基を有する有機ポリシロキサン化合物を１重量％〜10重
量％含有し、かつそのゲル分率が90％以上である紫外線
硬化型アクリレートから成ることを特徴とする光フアイ
バテープ心線。1. An optical fiber tape core wire comprising a plurality of ultraviolet-curable resin-coated optical fiber core wires having a colored layer as an outermost layer, which are arranged in parallel in a plane and collectively covered with an ultraviolet-curable resin. In the above-mentioned, the colored layer is composed of an ultraviolet-curable acrylate containing 1% by weight to 10% by weight of an organic polysiloxane compound having a functional group in the molecule and having a gel fraction of 90% or more. Optical fiber tape core wire.
ロキシル基、カルボキシル基、アミノ基またはメルカプ
ト基のいずれかであることを特徴とする特許請求の範囲
第１項記載の光フアイバテープ心線。2. The optical fiber ribbon according to claim 1, wherein the functional group is any one of vinyl group, acryl group, hydroxyl group, carboxyl group, amino group and mercapto group. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62311609A JP2525020B2 (en) | 1987-12-09 | 1987-12-09 | Optical fiber tape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62311609A JP2525020B2 (en) | 1987-12-09 | 1987-12-09 | Optical fiber tape |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01152405A JPH01152405A (en) | 1989-06-14 |
| JP2525020B2 true JP2525020B2 (en) | 1996-08-14 |
Family
ID=18019312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62311609A Expired - Lifetime JP2525020B2 (en) | 1987-12-09 | 1987-12-09 | Optical fiber tape |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2525020B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5761363A (en) * | 1996-03-07 | 1998-06-02 | Siecor Corporation | Optical fiber ribbon which is strippable and peelable |
| US6630242B1 (en) | 1999-07-30 | 2003-10-07 | Dsm N.V. | Radiation-curable composition with simultaneous color formation during cure |
| US6538045B1 (en) | 1999-12-23 | 2003-03-25 | Dsm N.V. | Optical fiber coating compositions containing secondary or tertiary amino silicone-containing additive |
| ES2261445T3 (en) | 2000-06-22 | 2006-11-16 | Prysmian Cavi E Sistemi Energia S.R.L. | COLORED OPTICAL FIBER AND ASSEMBLY IN TAPE OF OPTICAL FIBERS INCLUDING THE FIBER. |
| US6775443B2 (en) | 2001-01-29 | 2004-08-10 | Corning Cable Systems Llc | Tight buffered optical cables with release layers |
| KR20070010149A (en) * | 2004-04-14 | 2007-01-22 | 히다치 덴센 가부시끼가이샤 | Optical fiber tape unit and optical fiber cable |
| WO2005101080A1 (en) * | 2004-04-14 | 2005-10-27 | Hitachi Cable, Ltd. | Optical fiber tape unit and optical fiber cable |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2429044C2 (en) * | 1974-06-18 | 1982-03-04 | Blasius 7455 Jungingen Speidel | Sphygmomanometer |
| US4472021A (en) * | 1982-12-10 | 1984-09-18 | Desoto, Inc. | Strippable radiation-cured coatings for optical fiber and method |
-
1987
- 1987-12-09 JP JP62311609A patent/JP2525020B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01152405A (en) | 1989-06-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH11326718A (en) | Optical fiber multiribbon and its formation | |
| US6028976A (en) | Split type ribbon optical fiber core cable | |
| JP2585823B2 (en) | Optical fiber unit | |
| JP2525020B2 (en) | Optical fiber tape | |
| JP2763028B2 (en) | Optical fiber ribbon | |
| US6859593B2 (en) | Method of manufacturing an optical fiber ribbon, and an optical ribbon | |
| JP3166602B2 (en) | Optical fiber manufacturing method | |
| JP5082173B2 (en) | Split type optical fiber ribbon | |
| JPH0335210A (en) | Fiber for light transmission | |
| JPH01150106A (en) | Tape-shaped optical fiber | |
| JPH10115737A (en) | Single core coated optical fiber | |
| JPS63281109A (en) | Fiber for light transmission | |
| JPH0367208A (en) | Coated tape optical fiber | |
| JPH0749447Y2 (en) | Optical fiber tape core | |
| JP2002116358A (en) | Coated optical fiber tape and method for producing the same | |
| JPH09243876A (en) | Coated optical fiber | |
| JP2768674B2 (en) | Optical fiber cord | |
| JPH1062662A (en) | Optical coated fiber | |
| JPH01271715A (en) | Split type optical fiber tape | |
| JP3462634B2 (en) | Optical fiber core and method of removing coating | |
| JPH0622804Y2 (en) | Tape-shaped optical fiber core | |
| JP2002107590A (en) | Coated optical fiber ribbon and its manufacturing method | |
| JP2774626B2 (en) | Optical fiber ribbon | |
| JP2002090590A (en) | Coated optical fiber ribbon and method for manufacturing the same | |
| JP3274589B2 (en) | Optical fiber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080531 Year of fee payment: 12 |