| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for producing a glass preform, whereby the glass preform of high quality can be obtained by satisfactorily performing sintering while preventing increase in cost.SOLUTION: A method for producing a glass preform comprises, while feeding inert gas from a lower part of a furnace core tube 11, moving a glass particulate deposited body 14 placed inside the furnace core tube 11 downward or upward, thereby heating and sintering the same by heat in a heat zone in the furnace core tube 11. A lid 12 is installed at an upper part of the furnace core tube 11, and a partition plate 20 is installed above the glass particulate deposited body 14. When the glass particulate deposited body 14 is located above a prescribed position, the partition plate 20 is moved with the glass particulate deposited body 14. When the glass particulate deposited body 14 is located below the prescribed position, the partition plate 20 is placed at a stop position that is ≥500 mm below an upper end of the lid 12 and only the glass particulate deposited body 14 is moved. |
