| 摘要 |
PURPOSE:To uniformize the temp. distribution in the radial direction and to improve the non-roundness factor and eccentricity of an optical fiber by fixing a rotating mechanism to a furnace core tube. CONSTITUTION:A ring gear 3 is fixed to the outer periphery of a flange 2 formed on the lower end of the cylindrical furnace core tube 1, and a pinion gear 5 to be meshed with the ring gear 3 is connected to a motor 6. The motor 6 is driven to rotated the furnace core tube 1 through the gears 5 and 3, a high-frequency current is simultaneously applied to a high-frequency heating coil 7, an optical fiber preform 8 is inserted into the furnace core tube 1, and the preform is heated, softened, and spun. |
