Patent ID: 8661853

Claim:
A process for producing a glass in the production of a glass molded article formed of an optical glass by melting and clarifying a glass raw material to prepare a molten glass and molding said molten glass, the process comprising preparing a glass raw material that gives an oxide glass comprising, by cationic %, 12 to 65% of B 3+ , 0 to 20% of Si 4+ , 0 to 6% of Ge 4+ , 15 to 50% of total of La 3+ , Gd 3+ , Y 3+ , Yb 3+ , Sc 3+ and Lu 3+ , 4 to 54% of total of Ta 5+ , Zr 4+ , Ti 4+ , Nb 5+ , W 6+ and Bi 3+ , 0 to 35% of Zn 2+ , 0 to 9% of total of Li + , Na + and K + , and 0 to 15% of total of Mg 2+ , Ca 2+ , Sr 2+ and Ba 2+ , a total content of said cationic components in the oxide glass being 99 to 100%, and said glass raw material comprising carbonate and sulfate.