| 摘要 |
<p>An optical glass of the present invention has optical constants of a refractive index (nd) within a range from 1.75 to 1.85 and an Abbe number ( ?d) within a range from 35 to 45, comprises SiO<SUB>2</SUB>, B<SUB>2</SUB>O<SUB>3</SUB>, ZrO<SUB>2</SUB>, Nb<SUB>2</SUB>O<SUB>5</SUB>, Ta<SUB>2</SUB>O<SUB>5</SUB> and WO<SUB>3</SUB>, La<SUB>2</SUB>O<SUB>3</SUB>, ZnO and Li<SUB>2</SUB>O has a glass transition temperature (Tg) of 580 °C or below and has weathering resistance (surface method) of Class 1 or Class 2.</p> |
