| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of devitrification or striae in the manufacture of glass lump as a base material for forming an optical device. SOLUTION: The method of manufacturing the base material for forming the optical device possesses a glass receiving process for receiving a prescribed quantity of molten glass in a receiving die 14 and a cooling process for cooling the molten glass at a cooling speed more rapid than natural cooling at room temperature by blowing a cooling medium on the surface of the prescribed quantity of the molten glass 13a just after being received in the receiving die in the glass receiving process. COPYRIGHT: (C)2006,JPO&NCIPI
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