The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 2013
Filed:
Oct. 19, 2009
Naruki Koshimizu, Kanagawa, JP;
Yuji Abe, Kanagawa, JP;
Toshimi Habasaki, Kanagawa, JP;
Tetsuya Hayashi, Kanagawa, JP;
Naruki Koshimizu, Kanagawa, JP;
Yuji Abe, Kanagawa, JP;
Toshimi Habasaki, Kanagawa, JP;
Tetsuya Hayashi, Kanagawa, JP;
Sumitomo Electric Industries, Ltd., Osaka-shi, Osaka, JP;
Abstract
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×T×L' is made '2' or more are set.