Patent ID: 6546760
Filing Date: 2003-04-15
Classification: C03B,H05B

Abstract:
An optical fiber drawing furnace comprising:a muffle tube, into which an optical fiber preform is supplied; a cylindrical heater surrounding the muffle tube; a pair of support column portions which rise from the upper end of said heater at circumferential positions substantially equidistantly spaced from one another; four electrode connecting terminals and no more than four, two electrode connecting terminals extending perpendicularly from each of said support column portions and connecting to one another via a connecting element, the four electrode connecting terminals being arranged so that the angle between the adjacent terminals substantially equals 90Â°; an electric power source connected, via electrodes, to the four electrode connecting terminals; and two extension portions protruding upwardly from the heater to balance heat supplied by the pair of support column portions, and being disposed substantially equidistantly between said support column portions.