| abstract |
Disclosed is a method for producing a glass, wherein a molten glass is obtained by melting and refining a glass starting material and the molten glass is molded, thereby producing a glass molded body composed of an optical glass. The method for producing a glass is characterized by comprising preparation of a glass starting material so as to obtain an oxide glass which contains, in cationic percent, 12-65% of B 3+ , 0-20% of Si 4+ , 0-6% of Ge 4+ , 15-50% of La 3+ , Gd 3+ , Y 3+ , Yb 3+ , Sc 3+ and Lu 3+ in total, 4-54% of Ta 5+ , Zr 4+ , Ti 4+ , Nb 5+ , W 6+ and Bi 3+ in total, 0-35% of Zn 2+ , 0-9% of Li + , Na + and K + in total and 0-15% of Mg 2+ , Ca 2+ , Sr 2+ and Ba 2+ in total, with the sum of all cationic components being 99-100%. The method is also characterized in that the glass starting material contains a carbonate and a sulfate. |