JPH10268142A - Optical fiber winding method - Google Patents
Optical fiber winding methodInfo
- Publication number
- JPH10268142A JPH10268142A JP9090330A JP9033097A JPH10268142A JP H10268142 A JPH10268142 A JP H10268142A JP 9090330 A JP9090330 A JP 9090330A JP 9033097 A JP9033097 A JP 9033097A JP H10268142 A JPH10268142 A JP H10268142A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- winding
- bobbin
- tension
- round bar
- 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.)
- Pending
Links
Landscapes
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、巻き取りボビンに光フ
ァイバを巻き取る方法に関するもので、特に光ファイバ
をボビンに巻き取った際の光ファイバに加わっている巻
き張力及び側圧を解消するに好適な光ファイバの巻き取
り方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for winding an optical fiber around a winding bobbin, and more particularly to a method for eliminating a winding tension and a side pressure applied to an optical fiber when the optical fiber is wound around a bobbin. The present invention relates to a suitable optical fiber winding method.
【０００２】[0002]
【従来の技術】光ファイバの線引きは、石英ガラスを主
成分とする母材を加熱溶融しながら所要細径の裸光ファ
イバに引き落とし、引き続きこの裸光ファイバ外周に紫
外線硬化型樹脂等の保護樹脂被覆層を施し、線引き機の
引取りボビンに巻き取ってなされている。その後、通
常、引取りボビンに巻き取られた光ファイバは、巻き替
え機に掛けられ、線引き機の引取りボビンから所要の巻
き取りボビンに所要長毎に巻き替えられる。そして、こ
れら巻き取りボビンのまま光ファイバ製品として出荷さ
れるものについては各巻き取りボビン毎に光ファイバの
伝送損失、偏波依存損失、偏波モード分散等の特性検査
がなされ、またケーブル化工程等の次工程に送られるも
のについてはこれらの巻き取りボビンロットのうちの代
表ボビンについて光ファイバの伝送損失、偏波依存損
失、偏波モード分散等の特性検査がなされている。2. Description of the Related Art To draw an optical fiber, a base material mainly composed of quartz glass is heated and melted and dropped into a bare optical fiber having a required small diameter. It is provided with a coating layer and wound on a take-up bobbin of a drawing machine. Thereafter, the optical fiber wound around the take-up bobbin is usually wound around a winding machine, and is wound from the take-up bobbin of the wire drawing machine to a required take-up bobbin for each required length. For those wound bobbins that are shipped as optical fiber products, characteristic tests such as transmission loss, polarization dependent loss, and polarization mode dispersion of the optical fiber are performed for each winding bobbin. For the representative bobbin of these winding bobbin lots which are sent to the next process, such as those described above, characteristic tests such as transmission loss, polarization dependent loss, and polarization mode dispersion of the optical fiber are performed.
【０００３】通常、巻き取りボビンには数十ｍから数十
ｋｍもの長尺の光ファイバが幾層にも巻かれていて、巻
き取られている光ファイバには巻き取り時の張力や隣接
する光ファイバ相互間の側圧が加わった状態となってい
る。張力や側圧の加わった状態の光ファイバは伝送損
失、偏波依存損失、偏波モード分散等の光学特性に大き
な影響を被り、光ファイバに加わる張力、側圧の大きさ
に比例して光ファイバの伝送損失、偏波依存損失、偏波
モード分散等が増大する。従って、通常の巻き取りボビ
ンに巻かれたままの光ファイバは、伝送損失、偏波依存
損失、偏波モード分散等が増大したものとなっている。[0003] Usually, a long optical fiber of several tens of meters to several tens of kilometers is wound on a winding bobbin in several layers, and the wound optical fiber has a tension at the time of winding and an adjacent optical fiber. The side pressure between the optical fibers is in a state of being applied. An optical fiber under tension or side pressure greatly affects optical characteristics such as transmission loss, polarization dependent loss, and polarization mode dispersion, and the optical fiber is proportional to the magnitude of the tension and side pressure applied to the optical fiber. Transmission loss, polarization dependent loss, polarization mode dispersion and the like increase. Therefore, an optical fiber wound around a normal winding bobbin has increased transmission loss, polarization dependent loss, polarization mode dispersion, and the like.
【０００４】このため、従来から、ボビン巻きの光ファ
イバの伝送損失、偏波依存損失等を計測する場合には、
測定誤差をなくすために、張力・側圧を軽減した状態に
してから計測する方法がとられている。この計測のため
の光ファイバの張力・側圧軽減方法としては、光ファイ
バをボビン巻きから把取りにして張力・側圧を軽減させ
る方法、或いはボビンの巻き胴内を減圧または冷却して
巻き胴の直径を収縮可能にした計測用ボビンに光ファイ
バを巻き取り、巻き胴直径を収縮させることにより光フ
ァイバの張力・側圧を軽減させる方法等があった。例え
ば、上記の関連技術として特開平６−５９１３９号公報
が開示されている。しかし、上記前者の光ファイバを把
取りにする方法は光ファイバの信頼性を損なう恐れがあ
るうえ、把取りのままでは製品として出荷したり次工程
に送ることができないので再度ボビンに巻き替えねばな
らぬなど取扱のうえで問題があった。また、上記後者の
光ファイバの張力・側圧の軽減方法は、全ての巻き取り
ボビンに適用できる方法ではなく、光ファイバの巻かれ
た通常の巻き取りボビンのロットのうちの代表ボビンの
光ファイバについて伝送損失等の測定を行うためのもの
で、通常のボビンから計測専用ボビンに巻き替え、この
計測専用ボビンの光ファイバの張力・側圧を軽減させる
手段であり、そのうえ計測専用ボビンは張力・側圧軽減
のための複雑な機構を必要としていた。いずれにして
も、上記各方法は伝送損失の計測目的のみの光ファイバ
の張力・側圧の軽減手段であって、全ての巻き取りボビ
ンの光ファイバについて張力・側圧を軽減し、特性の優
れた光ファイバを提供するための手段ではなかった。For this reason, conventionally, when measuring the transmission loss, polarization dependent loss, etc. of a bobbin wound optical fiber,
In order to eliminate measurement errors, a method has been adopted in which measurement is performed after the tension and the side pressure are reduced. As a method of reducing the tension and the side pressure of the optical fiber for this measurement, a method of reducing the tension and the side pressure by holding the optical fiber from the bobbin winding, or reducing or cooling the inside of the bobbin winding drum to reduce the diameter of the winding drum There has been a method in which an optical fiber is wound around a measuring bobbin that is made contractible, and the tension and side pressure of the optical fiber are reduced by reducing the diameter of the winding drum. For example, Japanese Patent Application Laid-Open No. 6-59139 is disclosed as the related art. However, the former method of grasping an optical fiber may impair the reliability of the optical fiber, and it cannot be shipped as a product or sent to the next process as it is. There was a problem in handling, such as a bad luck. Further, the latter method of reducing the tension and the side pressure of the optical fiber is not a method applicable to all winding bobbins, but is applied to the optical fiber of the representative bobbin in the lot of the normal winding bobbin wound with the optical fiber. For measuring transmission loss, etc., it is a means to change from a normal bobbin to a dedicated bobbin to reduce the tension and side pressure of the optical fiber of this dedicated bobbin. Needed a complicated mechanism for. In any case, each of the above methods is a means for reducing the tension and the side pressure of the optical fiber only for the purpose of measuring the transmission loss. It was not a means to provide fiber.
【０００５】そこで、全ての巻き取りボビンについて、
光ファイバの張力・側圧を解消し、本来の光ファイバの
伝送損失、偏波依存損失、偏波モード分散等を得ること
ができ、これらの諸特性をそのまま計測できるな手段と
して、図２に図示する如き巻き取りボビンおよび巻き取
り方法が提案されている。以下、図２に沿い説明する。
巻き取りボビン１は円筒状巻き胴部２と巻き胴部２の両
側面に設けた円板状鍔部３からなり、円板状鍔部３の中
心軸には巻き取り軸穴４があけられてある。更に、円筒
状巻き胴部２の表面にはその巻軸方向に丸棒状のスペー
サ５が挿脱自在に設けられている。丸棒状スペーサ５の
挿脱は円板状鍔部３に設けた小孔６をとおして行われ
る。図の例では、丸棒状スペーサ５が巻き胴部２の表面
に沿って等間隔に４本設けられているが、本数は特に限
定されない。この巻き取りボビン１を用いての光ファイ
バＦの巻き取り方法は、丸棒状スペーサ５を巻き胴部２
に挿着した状態で光ファイバＦの巻き取り、巻き取り後
ボビン１から丸棒状スペーサ５を抜脱することにより、
ボビン１の巻き胴部２の直径が縮小されて、巻き取られ
ている光ファイバＦの張力・側圧が解消されるものであ
る。Therefore, for all winding bobbins,
As a means for eliminating the tension and side pressure of the optical fiber and obtaining the original transmission loss, polarization dependent loss, polarization mode dispersion, etc. of the optical fiber, these characteristics can be measured as they are. Such a winding bobbin and a winding method have been proposed. Hereinafter, description will be made with reference to FIG.
The winding bobbin 1 comprises a cylindrical winding drum 2 and disk-shaped flanges 3 provided on both side surfaces of the winding drum 2, and a winding shaft hole 4 is formed in the center axis of the disk-shaped flange 3. It is. Further, a round bar-shaped spacer 5 is provided on the surface of the cylindrical winding drum 2 in the direction of the winding axis so as to be freely inserted and removed. The insertion and removal of the round bar-shaped spacer 5 is performed through a small hole 6 provided in the disc-shaped flange 3. In the example of the figure, four round bar-shaped spacers 5 are provided at equal intervals along the surface of the winding drum portion 2, but the number is not particularly limited. The winding method of the optical fiber F using the winding bobbin 1 is as follows.
The optical fiber F is wound up in a state of being inserted into the bobbin 1 and the round bar-shaped spacer 5 is withdrawn from the bobbin 1 after winding up.
The diameter of the winding body 2 of the bobbin 1 is reduced, and the tension and the side pressure of the wound optical fiber F are eliminated.
【０００６】[0006]
【発明が解決しようとする課題】上叙の巻き取りボビン
１は、光ファイバの巻き層が比較的少ない場合には光フ
ァイバの巻き張力・側圧の解消に効果がある。しかし、
長尺の光ファイバが多層に巻かれた場合には、内層の光
ファイバの張力・側圧は解消するが、外層へ行くに従い
光ファイバの張力・側圧の解消の効果が少なくなり、光
ファイバ全長にわたっての張力・側圧の解消が難しいと
いう欠点があった。これは光ファイバ表面の滑り性に起
因し、丸棒状スペーサを抜脱して巻き直径が縮小されて
も、各巻き層の光ファイバ相互の摩擦力により光ファイ
バの弛み移動が全長にわたらないためである。従って、
表面滑り性の悪い光ファイバほどこの傾向が顕著となっ
ていた。The winding bobbin 1 described above is effective in eliminating the winding tension and side pressure of the optical fiber when the winding layer of the optical fiber is relatively small. But,
When a long optical fiber is wound in multiple layers, the tension and lateral pressure of the optical fiber in the inner layer are eliminated, but the effect of eliminating the tension and lateral pressure of the optical fiber is reduced toward the outer layer, and over the entire length of the optical fiber. However, there is a drawback that it is difficult to eliminate the tension and the side pressure. This is because, due to the slipperiness of the optical fiber surface, even if the winding diameter is reduced by pulling out the round bar spacer, the slack movement of the optical fiber does not extend over the entire length due to the frictional force between the optical fibers in each winding layer. is there. Therefore,
This tendency was remarkable in an optical fiber having lower surface slipperiness.
【０００７】そこで、本発明の目的は、巻き取りボビン
に長尺の光ファイバが多層に巻かれている場合であって
も、全ての巻き取りボビンについて最内層から最外層の
光ファイバの全長にわたって張力・側圧の解消が可能な
光ファイバの巻き取り方法を提供することにある。Accordingly, an object of the present invention is to provide a winding bobbin that extends over the entire length of the optical fiber from the innermost layer to the outermost layer, even when a long optical fiber is wound in multiple layers. An object of the present invention is to provide an optical fiber winding method capable of eliminating tension and side pressure.
【０００８】[0008]
【課題を解決するための手段】上記課題を解決するた
め、この発明は、光ファイバをボビンに巻き取る方法に
おいて、巻き取りボビンの巻き胴部表面巻軸方向に挿脱
自在に丸棒状スペーサを挿着し、前記丸棒状スペーサを
挿着した状態で前記ボビンの巻き胴部に所要長の光ファ
イバを巻き取っり、光ファイバ巻き取り後前記丸棒状ス
ペーサを前記巻き取りボビンから抜脱して光ファイバの
巻き取り直径を減少させ、続いて前記巻き取りボビン全
体に超音波振動を付与することにより、光ファイバの巻
き張力、側圧を解消する光ファイバの巻き取り方法を提
供することにある。In order to solve the above-mentioned problems, the present invention relates to a method of winding an optical fiber around a bobbin. The optical fiber of a required length is wound around the bobbin winding body in a state where the rod-shaped spacer is inserted and the round-bar-shaped spacer is inserted. An object of the present invention is to provide an optical fiber winding method for reducing the winding tension of the optical fiber and reducing the side pressure by reducing the fiber winding diameter and subsequently applying ultrasonic vibration to the entire winding bobbin.
【０００９】[0009]
【作用】本発明の光ファイバの巻き取り方法では、丸棒
状スペーサを装着した状態でボビン巻き胴部に光ファイ
バを巻き取った後、丸棒状スペーサをボビンから抜脱し
て光ファイバの巻き径を縮小させることにより、ボビン
内層部の光ファイバの張力、側圧が解消される。そし
て、更に巻き取りボビン全体に超音波振動を加えること
により、各巻き層の光ファイバは相互の光ファイバの摩
擦力に打勝って巻き径を縮小させる方向に移動する。こ
の結果、光ファイバの全長にわたる張力・側圧が均一に
解消される。かように、本発明によれば、全ての巻き取
りボビンの光ファイバについて張力・側圧を容易に解消
することができ、本来の優れた伝送損失、偏波依存損
失、偏波モード分散等の特性を有する状態で光ファイバ
を製造し提供することができる。従って、全ての巻き取
りボビンの光ファイバについて伝送損失、偏波依存損
失、偏波モード分散等の特性を正確に測定することがで
きる。According to the optical fiber winding method of the present invention, after the optical fiber is wound around the bobbin winding body with the round bar spacer attached, the round bar spacer is removed from the bobbin to reduce the winding diameter of the optical fiber. By reducing the size, the tension and side pressure of the optical fiber in the bobbin inner layer are eliminated. Then, by further applying ultrasonic vibration to the entire winding bobbin, the optical fibers of each winding layer move in the direction of reducing the winding diameter by overcoming the frictional force of the optical fibers. As a result, the tension and the side pressure over the entire length of the optical fiber are uniformly eliminated. As described above, according to the present invention, the tension and the side pressure can be easily eliminated for the optical fibers of all the winding bobbins, and the originally excellent characteristics such as transmission loss, polarization dependent loss, and polarization mode dispersion can be obtained. The optical fiber can be manufactured and provided in a state having the following. Therefore, characteristics such as transmission loss, polarization dependent loss, and polarization mode dispersion can be accurately measured for the optical fibers of all the winding bobbins.
【００１０】[0010]
【実施例】以下、図１に示す実施例により本発明の光フ
ァイバの巻き取り方法について詳細に説明する。なお、
これによりこの発明が限定されるものではない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method for winding an optical fiber according to the present invention will be described in detail with reference to the embodiment shown in FIG. In addition,
This does not limit the present invention.
【００１１】巻き取りボビン１は図２に図示すると同一
構造を有する。実施例として、巻き胴２の外径が６０ｍ
ｍ、内幅が３０ｍｍ、鍔３の外径が１２０ｍｍ、巻き軸
穴４の直径が５０ｍｍのアルミニウム製ボビンに、外径
５ｍｍのアルミニウム製丸棒スペーサ５を４本用い、こ
の４本の丸棒状スペーサ５を巻き胴２の外周巻軸方向に
巻き胴円周に沿い等間隔に挿着した。丸棒状スペーサ５
の挿着はボビン１の両側面の鍔部３に設けた小孔６に丸
棒状スペーサ５を挿入して行う。なお、鍔部３の小孔６
を鍔直径方向を長径とした長孔に形成しておき、丸棒状
スペーサ５を挿着する時は長径小孔６の孔上部にビス
（図示せず）等で固定し、丸棒状スペーサ５を抜脱する
時はビスを緩め長径小孔６の孔下部に丸棒状スペーサ５
を落とすようにすれば、スペーサ５の抜脱が容易とな
る。また、丸棒状スペーサ５の外径や本数は状況により
適宜に選択される。The winding bobbin 1 has the same structure as shown in FIG. As an example, the outer diameter of the winding drum 2 is 60 m.
m, the inner width is 30 mm, the outer diameter of the flange 3 is 120 mm, the diameter of the winding hole 4 is 50 mm, and four aluminum round bar spacers 5 having an outer diameter of 5 mm are used on the aluminum bobbin. The spacers 5 were inserted at equal intervals along the circumference of the winding drum 2 in the direction of the outer winding axis of the winding drum 2. Round bar spacer 5
Is inserted by inserting a round bar-shaped spacer 5 into a small hole 6 provided in the flange 3 on both sides of the bobbin 1. The small hole 6 of the flange 3
Is formed in a long hole having a major axis in the flange diameter direction, and when the round bar-shaped spacer 5 is inserted, the round bar-shaped spacer 5 is fixed to the upper portion of the small-diameter hole 6 with a screw (not shown) or the like. When pulling out, loosen the screw and remove the round bar-shaped spacer 5 below the long hole 6.
, The removal of the spacer 5 becomes easy. The outer diameter and the number of the round bar-shaped spacers 5 are appropriately selected depending on the situation.
【００１２】次に、上記構成の巻き取りボビン１を用い
た本発明の巻き取り方法を図１の工程を参照し説明す
る。 〔Ａ工程〕：上記丸棒状スペーサ５を挿着した巻き取り
ボビン１に、外径１２５μｍの裸光ファイバ外周に紫外
線硬化型の保護樹脂被覆層を施した外径２５０μｍの光
ファイバＦを、巻き取り張力２０ｇで３，０００ｍ巻き
取った。 〔Ｂ工程〕：巻き取り後、巻き取りボビン１から４本の
丸棒状スペーサ５を抜脱した。 〔Ｃ工程〕：丸棒状スペーサ５を抜脱した後、巻き取り
ボビン１の最外層の光ファイバＦを接着剤（図示せず）
で仮り止めし、出力１００Ｗの超音波発生機７により巻
き取りボビン１の全体に２０分間振動を付与した。Next, a winding method of the present invention using the winding bobbin 1 having the above-described configuration will be described with reference to the steps of FIG. [Step A]: An optical fiber F having an outer diameter of 250 μm, in which an ultraviolet-curable protective resin coating layer is provided on the outer periphery of a bare optical fiber having an outer diameter of 125 μm, is wound around the winding bobbin 1 having the round bar-shaped spacer 5 inserted therein. 3,000 m was taken up at a take-up tension of 20 g. [Step B]: After winding, four round bar spacers 5 were removed from the winding bobbin 1. [Step C]: After removing the round bar-shaped spacer 5, the outermost optical fiber F of the winding bobbin 1 is bonded with an adhesive (not shown).
And the entire bobbin 1 was vibrated for 20 minutes by the ultrasonic generator 7 having an output of 100 W.
【００１３】上記〔Ａ工程〕・〔Ｂ工程〕・〔Ｃ工程〕
の各工程後における光ファイバＦの巻き張力・側圧の解
消の程度を伝送損失特性を測定して比較した。その結果
を下記表１に示す。また、参考例として、Ｃ工程後に巻
き取りボビン１から把取りにして巻き張力・側圧を完全
に除去した状態での光ファイバＦについても伝送損失を
測定した。The above [Step A], [Step B] and [Step C]
The degree of elimination of the winding tension and the side pressure of the optical fiber F after each step was compared by measuring the transmission loss characteristics. The results are shown in Table 1 below. Further, as a reference example, the transmission loss was measured for the optical fiber F in a state in which the winding tension and the side pressure were completely removed by taking out from the winding bobbin 1 after the step C.
【００１４】[0014]
【表１】 表１から明らかな如く、上記Ｃ工程で超音波振動を付与
した光ファイバＦは、内層から外層の全長にわたり巻き
張力・側圧が解消されていることが伝送損失の測定から
も確認された。[Table 1] As is apparent from Table 1, it was confirmed from the measurement of the transmission loss that the optical fiber F to which the ultrasonic vibration was applied in the step C had the winding tension and the side pressure eliminated over the entire length from the inner layer to the outer layer.
【００１５】[0015]
【発明の効果】本発明の光ファイバの巻き取り方法によ
れば、極めて簡便な方法で、多層に巻かれた長尺光ファ
イバの場合であっても、その全長にわたり巻き張力・側
圧を解消することができる。更に、本発明は、全ての巻
き取りボビンに容易に適用することができ、巻き張力・
側圧の解消された本来の優れた伝送損失・偏波依存損
失、偏波モード分散等の諸特性を有する光ファイバを製
造し提供することができる。また、全てのボビン巻きの
状態の光ファイバについて、伝送損失・偏波依存損失、
偏波モード分散等の計測を誤差なく正確に測定可能とな
る。According to the optical fiber winding method of the present invention, even in the case of a long optical fiber wound in multiple layers, the winding tension and the side pressure are eliminated over the entire length by an extremely simple method. be able to. Further, the present invention can be easily applied to all winding bobbins, and has a winding tension and
It is possible to manufacture and provide an optical fiber having various characteristics such as transmission loss, polarization dependent loss, polarization mode dispersion, etc., from which the side pressure is eliminated. In addition, for all the bobbin-wound optical fibers, transmission loss, polarization dependent loss,
It is possible to accurately measure the polarization mode dispersion and the like without errors.
【図１】本発明の光ファイバの巻き取り方法の１実施例
を示す斜視図である。FIG. 1 is a perspective view showing one embodiment of a method for winding an optical fiber according to the present invention.
【図２】従来の光ファイバの巻き取り方法を示す斜視図
である。FIG. 2 is a perspective view showing a conventional optical fiber winding method.
１ 光ファイバ巻き取りボビン ２ 巻き胴部 ３ 鍔部 ４ 巻き軸穴 ５ 丸棒状スペーサ ６ 小孔 ７ 超音波発生機 Ｆ 光ファイバ DESCRIPTION OF SYMBOLS 1 Winding bobbin for optical fiber 2 Winding body 3 Flange 4 Winding hole 5 Round bar spacer 6 Small hole 7 Ultrasonic generator F Optical fiber
Claims (1)
いて、巻き取りボビンの巻き胴部表面巻軸方向に挿脱自
在に丸棒状スペーサを挿着し、前記丸棒状スペーサを挿
着した状態で前記ボビンの巻き胴部に光ファイバを巻き
取り、光ファイバ巻き取り後前記丸棒状スペーサを前記
巻き取りボビンから抜脱して光ファイバの巻き取り直径
を減少させ、続いて前記巻き取りボビン全体に超音波振
動を付与することにより、光ファイバの巻き張力、側圧
を解消することを特徴とする光ファイバの巻き取り方
法。In a method of winding an optical fiber around a bobbin, a round bar-shaped spacer is inserted and removed in the direction of a winding axis of a winding drum surface of the winding bobbin, and the round bar-shaped spacer is inserted in a state of being inserted. The optical fiber is wound around the winding body of the bobbin, and after winding the optical fiber, the round bar-shaped spacer is pulled out of the winding bobbin to reduce the winding diameter of the optical fiber. A method for winding an optical fiber, wherein the tension and side pressure of the optical fiber are eliminated by applying vibration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9090330A JPH10268142A (en) | 1997-03-25 | 1997-03-25 | Optical fiber winding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9090330A JPH10268142A (en) | 1997-03-25 | 1997-03-25 | Optical fiber winding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10268142A true JPH10268142A (en) | 1998-10-09 |
Family
ID=13995520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9090330A Pending JPH10268142A (en) | 1997-03-25 | 1997-03-25 | Optical fiber winding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10268142A (en) |
-
1997
- 1997-03-25 JP JP9090330A patent/JPH10268142A/en active Pending
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