OPTICAL FIBER DRAWING FURNACE

摘要

PURPOSE:To provide an optical fiber drawing furnace capable of obtaining an optical fiber small in diameter fluctuation from a large-sized optical fiber preform. CONSTITUTION:In optical fiber drawing furnace having a drawing chamber filled with an inert gas continuously fed from the upper side, heat-fusing the optical fiber preform inserted with a dummy rod supporting from the upper end opening of the drawing chamber and drawing the optical fiber from the bottom end, a cylindrical inert gas heating chamber 21 having a heating space part 20 to heat the introduced inert gas and formed with plural heated inert gas flow-out holes 22b at least at the under surface of the heating space part 20 is formed.