| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a glass preform by which a glass preform with stable characteristics even in the end part can be obtained without causing cost increase. SOLUTION: The method comprises forming a diameter reduction part 12, that gradually reduces the diameter towards the side of one end surface 11a, at the connection end of a glass rod 11 with a dummy rod 13, making a starting rod 15 by connecting the glass rod 11 with the dummy rod 13, and accumulating glass fine particles around the starting rod 15 to form an accumulation G1 of glass fine particles. By heating the accumulation G1 of glass fine particles with a heater 41 in a state that the accumulation G1 is hung so that the side of the diameter reduction part 12 becomes an upper side, a sintered and vitrified transparent glass preform G2 is obtained. COPYRIGHT: (C)2008,JPO&INPIT
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