| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide optical glass that hardly causes clouding on a lens surface. <P>SOLUTION: The optical glass contains, by mass%, 35-60% of SiO<SB>2</SB>, 14-40% of B<SB>2</SB>O<SB>3</SB>, 0.5-4% of Al<SB>2</SB>O<SB>3</SB>, 0-8.5% of BaO, 1-25% of SrO, 1-10% of Li<SB>2</SB>O, 5-10% of Li<SB>2</SB>O+Na<SB>2</SB>O+K<SB>2</SB>O, 0-2% of Y<SB>2</SB>O<SB>3</SB>, and less than 0.1% (including 0%) of Sb<SB>2</SB>O<SB>3</SB>, and has a refractive index nd of 1.58-1.62 and Abbe numberνd of not less than 58. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
