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:
Nov. 18, 2003
Filed:
Nov. 28, 2001
Nobuaki Orita, Tokyo, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
A device for continuously twisting an optical fiber, which can add a sufficient twist to an optical fiber, is provided. Reciprocating rollers reciprocate so that the moving direction would be opposite each other along a center axis of rotation. The optical fiber passes through a gap between the reciprocating rollers and runs in contact with the outer circumferential surface of respective reciprocating rollers in order. Reciprocation of the reciprocating rollers adds a twist to the optical fiber. When &phgr; is a contacting angle between the optical fiber and the reciprocating rollers, F is maximum static friction of the optical fiber against the outer circumferential surface of the reciprocating rollers, and T is tension of the optical fiber, the coefficient of friction &mgr; between the optical fiber and the outer circumferential surface of the reciprocating rollers is lead from an operational formula of &mgr;=(1/&phgr;)·ln(F/T). This coefficient of friction is set at a value in a range from not less than 0.6 to not more than 0.9.