HEATING FURNACE IN DRAWING DEVICE OF PLASTIC OPTICAL FIBER

摘要

PROBLEM TO BE SOLVED: To provide a heating furnace for a drawing device of a plastic optical fiber which is capable of improving a drawing line speed without degrading the outer diameter accuracy of the plastic optical fiber. SOLUTION: This heating furnace 23 in the drawing device of the plastic optical fiber is internally divided to a preheating section 23a and a heating and melting section 23b which are individually temperature adjust able on the downstream side and upstream side in the progressing direction of a preform 21 and the plastic optical fiber 27 formed from this preform 21. The preheating section and heating and melting section 23b are respectively provided with a preheater 31 and a melting heater 33. The preform 21 supplied into the heating furnace 23 by a preform supplying device 25 is preheated in the preheating section 23a and is then heated and melted in the melting section 23b and is drawn to a fibrous shape.