| 摘要 |
PROBLEM TO BE SOLVED: To provide optical glass for forming a mold lens having lowered glass softening temperature without using environmentally harmful substances such as PbO and As2 O3 . SOLUTION: This optical glass comprises, in terms of mol% 5 to 60 SiO2 , 5 to 55 preferably 20 or above B2 O3 , 10 to 40 KF, 0 to 30 NaF, 0 to 15 LiF, also 0 to 10 TiO2 , 0 to 5 Nb2 O5 , 0 to 5 ZrO2 , 0 to 10 Al2 O3 , 0 to 5 Sb2 O3 , and further 0 to 15 AlF3 , 0 to 5 CaF2 , 0 to 10 SrF2 and 0 to 5 BaF2 .
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