JP6379887B2 - Optical fiber winding method - Google Patents

Optical fiber winding method Download PDF

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JP6379887B2
JP6379887B2 JP2014180311A JP2014180311A JP6379887B2 JP 6379887 B2 JP6379887 B2 JP 6379887B2 JP 2014180311 A JP2014180311 A JP 2014180311A JP 2014180311 A JP2014180311 A JP 2014180311A JP 6379887 B2 JP6379887 B2 JP 6379887B2
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winding
optical fiber
cushion material
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誠幸 加藤
誠幸 加藤
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Sumitomo Electric Industries Ltd
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Description

本発明は、光ファイバの巻き取り方法に関する。   The present invention relates to an optical fiber winding method.

光ファイバの巻き取りボビンとして、ボビンの胴部表面に巻くクッション材の発泡倍率を規定したものが知られている（例えば、特許文献１参照）。また、クッション材の表面に接着剤を塗布したもの、クッション材の表面に樹脂層を形成したものが知られている（例えば、特許文献２参照）。   As a take-up bobbin for an optical fiber, one that defines a foaming ratio of a cushion material wound around the surface of a body part of the bobbin is known (for example, see Patent Document 1). Moreover, what applied the adhesive agent to the surface of the cushion material, and what formed the resin layer on the surface of the cushion material are known (for example, refer patent document 2).

特開２００２−３１６８３０号公報JP 2002-316830 A 特開２００６−５２０４２号公報JP 2006-52042 A

光ファイバの巻き取りボビンには、例えば、特許文献１、２のように、ボビン胴面近くの光ファイバに局所的な側圧がかからないように、胴部にクッション材を巻いている。
しかしながら、クッション材を巻いた状態で一定以上の張力で光ファイバを巻き取ると、光ファイバがクッション材に食い込んでしまう。そして、光ファイバの食い込みにより押し出されたクッション材の一部が片寄りを起こすなどして、ボビン端部の鍔際の巻き状態が凸となる場合がある。この状態のまま巻き取りを継続すると、さらにクッション材が押し込まれて巻取られた光ファイバが浮いてしまい、線跳ね、線飛びと呼ばれる巻き不良が発生する虞がある。このような巻き不良部では、浮いた光ファイバの上に光ファイバが巻かれることにより曲げ半径の小さな箇所が生じることになり、伝送損失が局所的に高くなるため、それに起因するＯＴＤＲ（Optical Time Domain Reflectometer）の巻段差（伝送損失異常）が発生してしまう。また、巻き状態が凸となっていると、見た目で異常と判断されたり、巻き崩れが発生して同様の巻き不良が発生する場合がある。一方、巻き取り張力を低くしすぎると、巻き緩みによる巻き不良が発生してしまう。 For example, as disclosed in Patent Documents 1 and 2, a cushion material is wound around the body portion of the optical fiber winding bobbin so that local side pressure is not applied to the optical fiber near the bobbin body surface.
However, if the optical fiber is wound with a certain tension or more with the cushion material being wound, the optical fiber bites into the cushion material. Then, a part of the cushion material pushed out by the bite of the optical fiber may be offset, and the winding state at the end of the bobbin end may be convex. If the winding is continued in this state, the wound optical fiber is further lifted by pushing the cushion material, and there is a risk that a winding failure called line jumping or line jumping may occur. In such a winding failure portion, a portion having a small bending radius is generated by winding the optical fiber on the floating optical fiber, and the transmission loss is locally increased. Therefore, the OTDR (Optical Time) resulting therefrom is increased. The winding step of the Domain Reflectometer (abnormal transmission loss) occurs. Further, if the winding state is convex, it may be judged as abnormal in appearance, or the winding may be collapsed and the same winding failure may occur. On the other hand, when the winding tension is too low, winding failure due to winding looseness occurs.

そこで、本発明の目的は、巻き不良の発生を防ぐことができる光ファイバの巻き取り方法を提供することにある。   Therefore, an object of the present invention is to provide an optical fiber winding method that can prevent the occurrence of winding failure.

本発明の一態様に係る光ファイバの巻き取り方法は、光ファイバをボビンの外周に巻き取る光ファイバの巻き取り方法であって、
前記巻き取りボビンは、胴部の外周面上に発泡樹脂を基材とするクッション材を備え、
前記クッション材の厚さｔ、前記発泡樹脂の発泡倍率Ｈ、巻き取り張力Ｔを、
２ｍｍ≦ｔ≦８ｍｍ、１０≦Ｈ≦３０、４０ｇ≦Ｔ≦８０ｇ、の範囲内とし、
前記クッション材の厚さｔおよび前記発泡倍率Ｈに対する上記範囲内の下限であるｔ＝２ｍｍおよびＨ＝１０のときの巻き取り張力Ｔを上記範囲内の上限である８０ｇとして、上記の範囲内で、前記クッション材の厚さｔおよび前記発泡倍率Ｈが大きくなるほど前記巻き取り張力Ｔを小さくして巻き取る。 An optical fiber winding method according to an aspect of the present invention is an optical fiber winding method for winding an optical fiber around an outer periphery of a bobbin,
The winding bobbin includes a cushioning material based on foamed resin on the outer peripheral surface of the trunk part,
The thickness t of the cushion material, the expansion ratio H of the foamed resin, and the winding tension T
Within the range of 2 mm ≦ t ≦ 8 mm, 10 ≦ H ≦ 30, 40 g ≦ T ≦ 80 g,
Within the above range, the winding tension T when the thickness t of the cushion material and the foaming magnification H are the lower limit within the above range t = 2 mm and the winding tension T when H = 10 is the upper limit within the above range 80 g. As the thickness t of the cushion material and the expansion ratio H increase, the winding tension T is decreased and the cushion material is wound.

本発明によれば、光ファイバを巻き取りボビンに巻き取る際に、巻き不良の発生を防ぐことができる。   According to the present invention, it is possible to prevent the occurrence of winding failure when winding an optical fiber on a winding bobbin.

本発明の実施形態に係る光ファイバの巻き取り方法において使用する巻き取りボビンの一例を示す図であり、（Ａ）は正面図、（Ｂ）はＡ−Ａ線の断面図である。It is a figure which shows an example of the winding bobbin used in the winding method of the optical fiber which concerns on embodiment of this invention, (A) is a front view, (B) is sectional drawing of an AA line. 光ファイバの巻き不良の発生の原因についての説明図である。It is explanatory drawing about the cause of generation | occurrence | production of the winding defect of an optical fiber. 実施例の結果を示すグラフである。It is a graph which shows the result of an Example.

［本発明の実施形態の説明］
最初に本発明の実施形態を列記して説明する。
本発明の実施形態に係る光ファイバの巻き取り方法は、
（１） 光ファイバをボビンの外周に巻き取る光ファイバの巻き取り方法であって、
前記巻き取りボビンは、胴部の外周面上に発泡樹脂を基材とするクッション材を備え、
前記クッション材の厚さｔ、前記発泡樹脂の発泡倍率Ｈ、巻き取り張力Ｔを、
２ｍｍ≦ｔ≦８ｍｍ、１０≦Ｈ≦３０、４０ｇ≦Ｔ≦８０ｇ、の範囲内とし、
前記クッション材の厚さｔおよび前記発泡倍率Ｈに対する上記範囲内の下限であるｔ＝２ｍｍおよびＨ＝１０のときの巻き取り張力Ｔを上記範囲内の上限である８０ｇとして、上記の範囲内で、前記クッション材の厚さｔおよび前記発泡倍率Ｈが大きくなるほど前記巻き取り張力Ｔを小さくして巻き取る。
巻き取りボビンのクッション材が厚く且つ発泡倍率が大きい程、巻き取り張力を低くすることにより、光ファイバのクッション材への食い込みが少なくなるため、食い込みを原因とする巻き不良が減少する。ただし、巻き取り張力を低くすると、巻き緩みによる巻き不良が発生しやすくなるので、適切なクッション材の厚さおよび発泡倍率が必要である。このような知見に鑑みて、巻き取りボビンのクッション材の厚さ、発泡倍率、巻き取り張力を上記の範囲内とした。これにより、光ファイバを巻き取る際の巻き不良の発生を防ぐことができる。よって、巻き不良に起因するＯＴＤＲ巻段差の発生も防ぐことができる。 [Description of Embodiment of the Present Invention]
First, embodiments of the present invention will be listed and described.
An optical fiber winding method according to an embodiment of the present invention includes:
(1) An optical fiber winding method for winding an optical fiber around an outer periphery of a bobbin,
The winding bobbin includes a cushioning material based on foamed resin on the outer peripheral surface of the trunk part,
The thickness t of the cushion material, the expansion ratio H of the foamed resin, and the winding tension T
Within the range of 2 mm ≦ t ≦ 8 mm, 10 ≦ H ≦ 30, 40 g ≦ T ≦ 80 g,
Within the above range, the winding tension T when the thickness t of the cushion material and the foaming magnification H are the lower limit within the above range t = 2 mm and the winding tension T when H = 10 is the upper limit within the above range 80 g. As the thickness t of the cushion material and the expansion ratio H increase, the winding tension T is decreased and the cushion material is wound.
As the cushion material of the take-up bobbin is thicker and the expansion ratio is larger, the take-up tension is lowered, so that the bite into the cushion material of the optical fiber is reduced, so that the winding failure due to the bite is reduced. However, if the winding tension is lowered, winding failure due to loose winding is likely to occur, and therefore an appropriate thickness of the cushioning material and foaming ratio are required. In view of such knowledge, the thickness of the cushion material of the take-up bobbin, the expansion ratio, and the take-up tension were set within the above ranges. Thereby, it is possible to prevent the occurrence of winding failure when winding the optical fiber. Therefore, occurrence of an OTDR winding step due to winding failure can also be prevented.

［本発明の実施形態の詳細］
本発明の実施形態に係る光ファイバの巻き取り方法の具体例を、以下に図面を参照しつつ説明する。
なお、本発明はこれらの例示に限定されるものではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 [Details of the embodiment of the present invention]
A specific example of an optical fiber winding method according to an embodiment of the present invention will be described below with reference to the drawings.
In addition, this invention is not limited to these illustrations, is shown by the claim, and intends that all the changes within the meaning and range equivalent to a claim are included.

図１は、本発明の実施形態に係る光ファイバの巻き取り方法において使用する巻き取りボビンの一例を示す図であり、（Ａ）は正面図、（Ｂ）はＡ−Ａ線の断面図である。本実施形態では、図１に示す巻き取りボビン１を使用して、光ファイバをボビンの外周に巻き取る。
図１に示す巻き取りボビン１は、光ファイバが巻かれる胴部２を備え、胴部２の両端には、鍔部４が設けられている。胴部２は、例えば金属またはプラスチックからなる円筒形状のもので、外径が例えば２８０ｍｍである。
そして、胴部２の外周面上には、シート状の発泡樹脂を基材とするクッション材３が、胴部２側の面に接着剤を塗布するなどして、胴部２に巻かれている。クッション材３の基材としての発泡樹脂は、例えば発泡ポリエチレンシートを用いる。 1A and 1B are diagrams showing an example of a winding bobbin used in an optical fiber winding method according to an embodiment of the present invention. FIG. 1A is a front view, and FIG. is there. In the present embodiment, the take-up bobbin 1 shown in FIG. 1 is used to wind up the optical fiber around the bobbin.
A take-up bobbin 1 shown in FIG. 1 includes a body portion 2 around which an optical fiber is wound, and flange portions 4 are provided at both ends of the body portion 2. The trunk | drum 2 is a cylindrical thing which consists of metal or a plastics, for example, and an outer diameter is 280 mm.
And on the outer peripheral surface of the trunk | drum 2, the cushion material 3 which uses a sheet-like foamed resin as a base material is wound around the trunk | drum 2 by apply | coating an adhesive agent etc. to the surface at the side of the trunk | drum 2. Yes. For example, a foamed polyethylene sheet is used as the foamed resin as the base material of the cushion material 3.

次に、図２を参照して、クッション材３を巻いた巻き取りボビン１に、巻き緩みや巻崩れが生じないように、所定の張力以上の張力で光ファイバ５を巻き取る際に、巻き不良が発生する原因について説明する。
まず、図２の（ａ）に示すように、巻き取りボビン１の左端部Ｌから光ファイバ５を巻き取り始める。
光ファイバ５の巻き取りが進むに従い、図２の（ｂ）に示すように、所定の張力以上の巻き張力によりクッション材３が締め付けられるので、巻き取り方向Ｂにクッション材３が押し出されて押出部３ａが発生する。 Next, referring to FIG. 2, when winding the optical fiber 5 with a tension higher than a predetermined tension so that the winding bobbin 1 wound with the cushion material 3 does not loosen or collapse, The cause of the failure will be described.
First, as shown in FIG. 2A, the optical fiber 5 starts to be wound from the left end L of the winding bobbin 1.
As the winding of the optical fiber 5 proceeds, as shown in FIG. 2 (b), the cushion material 3 is tightened by a winding tension equal to or higher than a predetermined tension, so that the cushion material 3 is pushed out in the winding direction B and extruded. Part 3a is generated.

さらに巻き取りが進むのに従い、図２の（ｃ）に示すように、クッション材３の押出部３ａが大きくなり、やがて巻き取りボビン１の右端部Ｕの鍔部４にぶつかり、大きく膨らむ。
そして、図２の（ｄ）に示すように、巻き取りボビン１の右端部Ｕ近傍では、クッション材３の押出部３ａの上にも光ファイバ５が巻かれる。 As the winding proceeds further, as shown in FIG. 2 (c), the push-out portion 3a of the cushion material 3 becomes larger and eventually hits the flange 4 at the right end U of the winding bobbin 1 and swells greatly.
Then, as shown in FIG. 2 (d), the optical fiber 5 is also wound on the extruded portion 3 a of the cushion material 3 in the vicinity of the right end U of the take-up bobbin 1.

さらに、図２の（ｅ）に示すように、光ファイバ５が巻かれた層が増えてくると、上の層から押される力Ｃが増えるため、膨らんだクッション材３の押出部３ａが縮むが、光ファイバ５は縮まないので浮いて緩んでしまい、線跳ねや線飛びと呼ばれる巻き不良が発生する虞がある。
そして、光ファイバ５が緩んだ状態の上層にさらに光ファイバ５が巻かれると、光ファイバ５に微小な曲げがある状態が固定されることになり、局所的に伝送損失が高くなる。すなわち、ＯＴＤＲの巻段差が発生してしまう。 Further, as shown in FIG. 2 (e), when the number of layers around which the optical fiber 5 is wound increases, the force C pushed from the upper layer increases, so that the extruded portion 3a of the swelled cushion material 3 contracts. However, since the optical fiber 5 does not shrink, it floats and loosens, and there is a risk that a winding failure called line jumping or line jumping may occur.
When the optical fiber 5 is further wound on the upper layer in a state where the optical fiber 5 is loosened, a state in which the optical fiber 5 has a slight bend is fixed, and transmission loss locally increases. That is, an OTDR winding step occurs.

なお、光ファイバ５の巻き状態が凸や凹となっている箇所は、見た目だけで巻き不良と判断される場合もある。しかも巻き状態が凸や凹となっている箇所は崩れやすく、巻き崩れが発生すれば上記の線跳ねや線飛び同様の巻き不良が発生する場合もある。   It should be noted that a portion where the winding state of the optical fiber 5 is convex or concave may be determined as a winding failure only by appearance. In addition, a portion where the winding state is convex or concave is easy to collapse, and if the winding collapses, a winding failure similar to the above-described line jumping or line jumping may occur.

以上のような知見から、本発明者らは、巻き不良の発生を防ぐ方法として、巻き崩れが起きない所定の張力に耐えられるクッション材３の厚さおよび発泡樹脂の発泡倍率を予め決めておくことと、張力を上げる必要がある場合は、より薄くて硬いクッション材３を使用して光ファイバの巻き取りを行うとよいことを見出した。   From the above knowledge, as a method for preventing the occurrence of winding failure, the present inventors determine in advance the thickness of the cushioning material 3 that can withstand a predetermined tension that does not cause winding collapse and the foaming ratio of the foamed resin. In addition, when it is necessary to increase the tension, it has been found that the optical fiber may be wound using a thinner and harder cushion material 3.

一方、巻き取り張力は、低くすると巻き緩みが発生しやすくなり、高くなると巻きが固くなりすぎて、光ファイバの伝送損失が大きくなる。このため、本実施形態では、巻き取り張力Ｔを、４０ｇ≦Ｔ≦８０ｇ、とする。   On the other hand, if the winding tension is low, loose winding tends to occur, and if it is high, the winding becomes too hard and the transmission loss of the optical fiber increases. For this reason, in this embodiment, the winding tension T is set to 40 g ≦ T ≦ 80 g.

また、本実施形態では、上記の張力Ｔの範囲内で張力に耐えられるクッション材３の厚さおよび基材とする発泡樹脂の発泡倍率を求め、クッション材３の厚さｔ、発泡樹脂の発泡倍率Ｈを、２ｍｍ≦ｔ≦８ｍｍ、１０≦Ｈ≦３０の範囲内とする。   Further, in the present embodiment, the thickness of the cushioning material 3 that can withstand the tension within the range of the tension T and the foaming ratio of the foamed resin used as the base material are obtained, and the thickness t of the cushioning material 3 and foaming of the foamed resin are obtained. The magnification H is set in the range of 2 mm ≦ t ≦ 8 mm and 10 ≦ H ≦ 30.

そして、本実施形態では、クッション材３の厚さｔおよび発泡倍率Ｈに対する範囲内の下限であるｔ＝２ｍｍおよびＨ＝１０のときの巻き取り張力Ｔを上限の８０ｇとして、上記の範囲内で、クッション材３の厚さｔおよび発泡倍率Ｈが大きくなるほど巻き取り張力Ｔを小さくして巻き取るようにする。   In the present embodiment, the winding tension T at the time of t = 2 mm and H = 10, which are lower limits within the range of the thickness t of the cushion material 3 and the foaming ratio H, is 80 g as the upper limit, and within the above range. As the thickness t and the expansion ratio H of the cushion material 3 are increased, the winding tension T is decreased and the cushion material 3 is wound.

以上の本実施形態に係る光ファイバの巻き取り方法によれば、光ファイバ５を巻き取る際の巻き不良の発生を防ぐことができる。よって、巻き不良に起因するＯＴＤＲ巻段差の発生も防ぐことができる。   According to the above-described optical fiber winding method according to the present embodiment, it is possible to prevent the occurrence of winding failure when winding the optical fiber 5. Therefore, occurrence of an OTDR winding step due to winding failure can also be prevented.

［実施例］
次に、光ファイバの巻き取り方法の実施例について説明する。
本発明の上記実施形態に係る光ファイバの巻き取り方法では、図１で示した巻き取りボビン１として、胴部２の外径が２８０ｍｍのボビンを使用した。そして、クッション材３の厚さｔを２ｍｍ〜８ｍｍ、発泡倍率Ｈを１０倍〜３０倍の範囲で変えて、以下の表1の例１〜例９の巻き取りボビン１を作成した。この例１〜例９の巻き取りボビン１に対して、それぞれ、径が０．２５ｍｍの光ファイバを２０〜３０ｋｍ程度の長さで１０ボビン巻き取った。そして、それぞれのｔ、Ｈの時に、巻き不良が発生しない上限の張力Ｔを測定した。 [Example]
Next, an embodiment of an optical fiber winding method will be described.
In the optical fiber winding method according to the embodiment of the present invention, a bobbin having an outer diameter of the body portion 2 of 280 mm was used as the winding bobbin 1 shown in FIG. And the winding bobbin 1 of Example 1-Example 9 of the following Table 1 was created, changing the thickness t of the cushion material 3 in 2 mm-8 mm, and the foaming ratio H in the range of 10 times-30 times. For each of the take-up bobbins 1 of Examples 1 to 9, 10 bobbins were wound with an optical fiber having a diameter of 0.25 mm in a length of about 20 to 30 km. And the upper limit tension | tensile_strength T which a winding defect does not generate | occur | produce at each t and H was measured.

Figure 0006379887
Figure 0006379887

実施例の結果のグラフを図３に示す。図３は、表１で示した各例（例１〜例９）における良好上限張力の結果を示すグラフである。なお、○が例１〜例３、□が例４〜例６、△が例７〜例９を示す。
図３に示すように、厚さｔが３ｍｍおよび発泡倍率Ｈが２０倍のクッション材３を用いた例４では良好上限張力は６０ｇであり、巻き取り張力Ｔを８０ｇとした場合は巻き不良が多発した。ところが、厚さｔが２ｍｍおよび発泡倍率Ｈが１０倍の薄くて硬いクッション材３を用いた例１では、巻き取り張力Ｔを８０ｇとしても巻き不良は発生しなかった。
また、厚さｔが８ｍｍおよび発泡倍率Ｈが２０倍の厚くて柔らかいクッション材３を用いた例６では良好上限張力は４０ｇであった。 A graph of the results of the examples is shown in FIG. FIG. 3 is a graph showing the results of good upper limit tension in each example (Example 1 to Example 9) shown in Table 1. In addition, (circle) shows Example 1-Example 3, (square) shows Example 4-Example 6, (triangle | delta) shows Example 7-Example 9.
As shown in FIG. 3, in Example 4 using the cushion material 3 having a thickness t of 3 mm and a foaming ratio H of 20 times, the good upper limit tension is 60 g, and when the winding tension T is 80 g, winding failure is It occurred frequently. However, in Example 1 using the thin and hard cushion material 3 having a thickness t of 2 mm and an expansion ratio H of 10 times, no winding failure occurred even when the winding tension T was 80 g.
In Example 6 in which the thick and soft cushion material 3 having a thickness t of 8 mm and an expansion ratio H of 20 was used, the good upper limit tension was 40 g.

上記結果から、巻き取り張力Ｔを４０ｇ≦Ｔ≦８０ｇとした場合、厚さｔを２ｍｍ≦ｔ≦８ｍｍおよび発泡倍率Ｈを１０≦Ｈ≦３０の範囲内とし、ｔおよびＨに対する上記範囲内の下限であるｔ＝２ｍｍおよびＨ＝１０のときの巻き取り張力Ｔを上記範囲内の上限である８０ｇとして、上記の範囲内で、クッション材３の厚さｔおよび発泡倍率Ｈを大きくするほど巻き取り張力Ｔを小さくして巻き取るようにすることがよいことがわかった。   From the above results, when the winding tension T is 40 g ≦ T ≦ 80 g, the thickness t is within the range of 2 mm ≦ t ≦ 8 mm and the expansion ratio H is within the range of 10 ≦ H ≦ 30. The winding tension T when the lower limit t = 2 mm and H = 10 is set to 80 g which is the upper limit within the above range, and within the above range, the thickness t and the expansion ratio H of the cushion material 3 are increased as the winding tension T is increased. It has been found that it is preferable to reduce the take-up tension T and wind it up.

１ 巻き取りボビン
２ 胴部
３ クッション材
３ａ 押出部
４ 鍔部
５ 光ファイバ DESCRIPTION OF SYMBOLS 1 Winding bobbin 2 Body part 3 Cushion material 3a Extrusion part 4 Gutter part 5 Optical fiber

Claims (1)

光ファイバを巻き取りボビンの外周に巻き取る光ファイバの巻き取り方法であって、
前記巻き取りボビンは、胴部の外周面上に発泡樹脂を基材とするクッション材を備え、
前記クッション材の厚さｔ、前記発泡樹脂の発泡倍率Ｈ、巻き取り張力Ｔを、
２ｍｍ≦ｔ≦８ｍｍ、１０≦Ｈ≦３０、４０ｇ≦Ｔ≦８０ｇ、の範囲内とし、
前記クッション材の厚さｔおよび前記発泡倍率Ｈに対する上記範囲内の下限であるｔ＝２ｍｍおよびＨ＝１０のときの巻き取り張力Ｔを上記範囲内の上限である８０ｇとして、
前記クッション材の厚さｔおよび前記発泡倍率Ｈが上記の範囲内で互いに異なる複数の前記巻き取りボビンに前記光ファイバを巻き取るにあたり、前記クッション材の厚さｔおよび前記発泡倍率Ｈが大きくなるほど前記巻き取り張力Ｔを小さくして巻き取る、光ファイバの巻き取り方法。 An optical fiber winding method for winding an optical fiber around a winding bobbin,
The winding bobbin includes a cushioning material based on foamed resin on the outer peripheral surface of the trunk part,
The thickness t of the cushion material, the expansion ratio H of the foamed resin, and the winding tension T
Within the range of 2 mm ≦ t ≦ 8 mm, 10 ≦ H ≦ 30, 40 g ≦ T ≦ 80 g,
The winding tension T when the thickness t of the cushion material and the foaming magnification H are lower limits within the above range t = 2 mm and H = 10 is 80 g which is the upper limit within the above range,
When the optical fiber is wound around the plurality of winding bobbins whose thickness t and the expansion ratio H are different from each other within the above range, as the thickness t and the expansion ratio H of the cushion material increase. An optical fiber winding method in which the winding tension T is reduced to wind the optical fiber.
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