| 摘要 |
PURPOSE:To eliminate the eccentricity of the core of an obtained optical fiber by supporting the lower periphery of a core material without contact and concentrically with a rotary chuck by the static pressure bearing utilizing a compressed gas. CONSTITUTION:The upper end of the core material 5 of quartz glass, etc., to be deposited with a glass body 6 is held by the rotary chuck 1. A glass material is introduced into the oxyhydrogen flame by a combustion burner 3 provided in a reaction vessel 2 and hydrolyzed by the flame. The fine glass particles thus formed are deposited on the porous glass forming part 5a of the core material 5 to deposit the porous glass body 6. Plural nozzles 7 for injecting the compressed gas of an inert gas, etc., against the core material 5 at uniform pressure are annularly provided around the core material 5 immediately under the reaction vessel 2, and the core material is supported without contact by the uniform pressure of the compressed gas from the periphery. |
