Optical fiber drawing furnace
A technology of drawing furnace and optical fiber, which is applied in glass manufacturing equipment, manufacturing tools, etc., can solve the problems of the influence of the outer diameter of the optical fiber and the turbulent airflow, and achieve the effect of saving electricity and improving heating efficiency.
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[0013] figure 2 It is a conceptual diagram showing the drawing furnace 20 disclosed in patent document 1. The drawing furnace 20 has a furnace tube 23 and a heater 4 for heating the furnace tube, and the optical fiber 2 is drawn by inserting the glass preform 1 for an optical fiber into the furnace tube 23 and heating and melting it. The optical fiber 2 hangs down from the lower end 1 a of the molten glass preform located in the center of the heater 4 and is drawn out downward. The furnace core tube 23 has: a reduced-diameter part 23a whose inner diameter is tapered along the shape of the lower end part 1a of the glass base material; and a reduced-diameter tube part 23b whose uniform inner diameter and outer diameter Unreduced uniform outer diameter.
[0014] According to the drawing furnace 20, the inert gas flow in the furnace core tube 23 can be formed into a laminar flow, and fluctuations in the outer diameter of the optical fiber can be suppressed. According to the wi...
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