| 摘要 |
Provided is a manufacturing method of quartz glass, which includes forming a soot deposition member that includes an effective portion having a substantially constant outer diameter and being to become a material of a glass product and ineffective portions formed at both ends of the effective portion and having an outer diameter changing in a tapering form, by depositing soot to a starting member being raised while rotating, the soot being generated by flame hydrolysis of a raw material gas, the manufacturing method either including: an effective portion forming step of forming the effective portion by rotating the starting member and the soot deposition member at a rotation speed appropriate for forming the effective portion, after the stabilization of the outer diameter of the soot deposition member; and an ineffective portion forming step of forming an ineffective portion by setting a peripheral speed of a surface of the starting member to 2.0 m/minute or below, during a time from deposition start of the soot onto the starting member and until the outer diameter of the soot deposition member is stabilized, or including: a forming step of forming an ineffective portion while decreasing a peripheral speed of a surface of the starting member to a predetermined final peripheral speed in a ratio of 1.3 m/minute or below per second during a period after the effective portion is formed and until the starting member and the soot deposition member stop rotating.
|
