Patent ID: 6647748
Filing Date: 2003-11-18
Classification: C03B

Abstract:
A device for continuously twisting an optical fiber, which adds a twist to the optical fiber manufactured by applying a coating material on the optical fiber drawn from an optical fiber preform, comprising:a reciprocating roller, which rotates with its outer circumferential surface in contact with the running optical fiber while reciprocates along a center axis of rotation to continuously add a twist to the above running optical fiber, wherein the above outer circumferential surface of the reciprocating roller has a coefficient of friction &mgr; for the optical fiber, the coefficient of friction &mgr; being lead from an operational formula of &mgr;=(1/&phgr;)Â·ln (F/T), wherein &phgr; is a contacting angle between the optical fiber and the reciprocating roller, F is maximum static friction of the optical fiber against the outer circumferential surface of the reciprocating roller, and T is tension of the optical fiber, and the above coefficient of friction &mgr; being set at a value in a range from not less than 0.6 to not more than 0.9.