| 摘要 |
The glass preform which is the final step mold product before the last pressure molding can be obtained by simple molding method without cutting or polishing precess. The preform flux is loaded the first heating supporter of which temperature is correspond to the preform viscosity of 102-104 poise and secondary the molded preform is transported to the second heating supporter of which temperature is correspond to the preform viscosity of 104-106 poise and the preform is turned over and finally the preform is pressure molded as one please. The heating supporter is made of aluminum oxide or carbon and the shape of heating supporter can be changed into the curved surface of the final lenz.
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