| 摘要 |
<p>PURPOSE:To enhance the yield of starting material by successively feeding specified gaseous starting material for glass, combustible gas, steam and combustion improving gas into a multiply tubed torch for synthesizing glass, synthesizing fine glass particles and depositing them on a starting member. CONSTITUTION:A central flame 6 is formed by feeding gaseous starting material for forming glass such as SiCl4 into the central layer 2 of a multiply tubed torch 1, combustible gas such as gaseous H2 into the 2nd layer 3, steam into the 3rd layer 4 and combustion improving gas such as gaseous O2 into the 4th layer 5. A peripheral flame 11 is then formed by feeding gaseous Ar into the 5th layer 7, gaseous H2 into the 6th layer 8, gaseous Ar into the 7th layer 9 and gaseous O2 into the 8th layer 10. Fine glass particles 12 synthesized with the torch 1 are deposited on the surface of a starting member 15 turning on its axis in a vessel 14 fitted with an exhaust system 13 and the member 15 is slowly pulled up to form a porous glass base material 16 for an optical fiber.</p> |
