| 摘要 |
PROBLEM TO BE SOLVED: To provide optical glass with high weather resistance which substantially does not contain a lead compound or the like, has a low refractive index, a high dispersibility, and low Tg and T<SB>L</SB>, and is suitable for precision press forming. SOLUTION: The optical glass contains glass components of 40-50 wt.% P<SB>2</SB>O<SB>5</SB>, 0.1-2 wt.% Al<SB>2</SB>O<SB>3</SB>, 11-20 wt.% TiO<SB>2</SB>, 0.1-4.5 wt.% Nb<SB>2</SB>O<SB>5</SB>, 0-3 wt.% Li<SB>2</SB>O (including zero), 10-25 wt.% Na<SB>2</SB>O, 0-15 wt.% K<SB>2</SB>O (including zero), 15-25 wt.% Li<SB>2</SB>O+Na<SB>2</SB>O+K<SB>2</SB>O, 0-5 wt.% MgO (including zero), 0-5 wt.% CaO (including zero), 0.1-20 wt.% SrO, 0-5 wt.% BaO (including zero), 0.1-10 wt.% ZnO, and 0.5-20 wt.% MgO+CaO+SrO+BaO+ZnO. COPYRIGHT: (C)2005,JPO&NCIPI
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