Sumitomo Electric Industries, Limited

Naruki Koshimizu

Tetsuya Hayashi

Yuji Abe

Toshimi Habasaki

An optical fiber producing method and apparatus for producing an optical fiber in which, in a path where an optical fiber is reeled out from a supply bobbin, taken up by take-up means, and wound by a winding bobbin, twists are alternately imparted to the optical fiber by a twist imparting portion. A zone where a high tension load is allowed to be applied to the optical fiber without affecting winding tension of the winding bobbin is disposed, a twist is imparted in the zone, and, when tension immediately before the twist imparting portion is indicated by T (g), a free path length is indicated by L, a twisting amount is indicated by R (turns/m), and a and b are constants, the tension and free path length by which the twisting amount R approximated by 'R=a&#xd7;T&#xd7;L' is made '2' or more are set.

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Kanagawa, Japan

Naruki Koshimizu