APPARATUS FOR HEAT-TREATING POROUS GLASS PREFORM FOR OPTICAL FIBER
PROBLEM TO BE SOLVED: To improve a method for introducing atmospheric gas in the core tube of a heating furnace in which a porous glass preform is heat-treated. SOLUTION: In an apparatus for heat-treating a porous glass preform for an optical fiber, the tip gas discharge opening of a gas introductio...
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| Zusammenfassung: | PROBLEM TO BE SOLVED: To improve a method for introducing atmospheric gas in the core tube of a heating furnace in which a porous glass preform is heat-treated. SOLUTION: In an apparatus for heat-treating a porous glass preform for an optical fiber, the tip gas discharge opening of a gas introduction pipe disposed in the core tube of a heating furnace in which a porous glass preform is heat-treated is made upward and positioned above the bottom of the core tube. COPYRIGHT: (C)2003,JPO |
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