BOBBIN FOR WINDING OPTICAL FIBER, OPTICAL FIBER WINDING METHOD, AND BOBBIN-WOUND OPTICAL FIBER

PROBLEM TO BE SOLVED: To reduce centrifugal force applied to a main winding collar, while preventing decline of rigidity or strength in the center axis direction of the main winding collar of a bobbin for winding an optical fiber.SOLUTION: There is provided a bobbin for winding an optical fiber provided with each main winding collar 2 projecting respectively toward the outside in the radial direction, on both ends in the center axis O direction of such a main winding trunk 1 that the optical fiber is wound around its outer peripheral surface. In the main winding collar, on the periphery positioned a little to the outside in the radial direction, a thin wall part 2a is formed, which has a smaller thickness in the center axis direction than the thickness in the center axis direction of an inner peripheral edge part linked to the main winding trunk.SELECTED DRAWING: Figure 1 【課題】光ファイバ巻取用ボビンの主巻取鍔における中心軸方向の剛性や強度の低下を防ぎつつ、主巻取鍔に作用する遠心力を低減させる。【解決手段】外周面に光ファイバが巻回される主巻取胴部１における中心軸Ｏ方向の両端部に、それぞれ径方向の外側に向けて突出する主巻取鍔２が設けられた光ファイバ巻取用ボビンにおいて、主巻取鍔のうち、径方向の外側寄りに位置する外周部には、主巻取胴部と連なる内周縁部における中心軸方向の厚みよりも、中心軸方向の厚みが小さい薄肉部２ａが形成されている。【選択図】図１