| 摘要 |
PROBLEM TO BE SOLVED: To provide a bobbin for optical fiber take-up in which lowering of strength and stiffness due to forming a slit in a main flange is avoided, crossover is not generated, and introduction of an optical fiber from an auxiliary winding trunk part to a main winding trunk part can be simply and easily implemented, to make take-up work mechanized and automated in the bobbin for optical fiber take-up in which main flange parts are provided at axial direction both ends of the main winding trunk part formed as cylindrical, the auxiliary winding trunk part is provided at the outside of at least one of the main flanges.SOLUTION: Shallow notch parts 20 are formed at outer periphery edge parts of main flanges 14A, 14B, an optical fiber is guided through the notch part from an auxiliary winding trunk part 16A side to a main winding trunk part, grooves 22A, 22B succeeding the notch parts are formed at inner periphery surfaces of the flange parts, and the optical fiber is guided through the groove from the notch part to the outer periphery surface of the main winding trunk part. |
