| 摘要 |
PURPOSE:When a parent material for optical fiber is produced through the chemically lining deposition in gas phases, an earpick-shaped rod is used to scrape out the undesired oxide deposition in the support tube on the exhaustion side to enable easy production of a parent material with good optical fiber properties. CONSTITUTION:When a quartz tube 1 is used to produce a parent material for optical fiber through the lining deposition in gas phases, a rod 21 with an earpick-shaped end 21A is set in the support tube 3 on the exhaustion side and the undesired oxides depositing in the support tube are scraped off from the wall, for example, the rod is reciprocated, as it is supported with a bar 30 and the quartz tube is rotated. Then, the earpick end is turned down by 180 deg. and the oxides 12 are scraped out of the tube 3. |
