| 摘要 |
In a method for manufacturing a glass preform through a heating process of heating a glass particles deposit including a clad partially while moving it successively in a longitudinal direction to form the glass particles deposit, and vitrifying the glass particles deposit to form the glass preform, wherein a chlorine based gas is preferably included at least in the atmosphere of a furnace tube 2 to vitrify the glass preform 9 in the process of heating the glass particles deposit while moving at least the glass particles deposit upward or downward, using a lift 7 for traversing the glass particles deposit (glass preform 9) upward or downward throughout the process.
|
