| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus for manufacturing an optical preform by using an internal vapor deposition process. SOLUTION: The apparatus comprises an energy source and a substrate tube. The substrate tube comprises a supply side for supplying a glass-forming precursor and a discharge side for discharging constituents not being deposited on the interior of the substrate tube. The energy source is movable along the length of the substrate tube between a point of reversal at the supply side and a point of reversal at the discharge side. COPYRIGHT: (C)2007,JPO&INPIT
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