| 摘要 |
An optical glass has a refractive index (nd) of 1.60 or over and excellent transmittance and internal quality. The optical glass comprises 0.1-4 mass % of Ta<SUB>2</SUB>O<SUB>5 </SUB>to total mass of glass calculated on oxide basis, has ratio of 0.95<TA<SUB>2</SUB>O<SUB>5</SUB>/(Ta<SUB>2</SUB>O<SUB>5</SUB>+(ZrO<SUB>2</SUB>)+TiO<SUB>2</SUB>+Nb<SUB>2</SUB>O<SUB>5</SUB>+WO<SUB>3</SUB>)x5)<=1.00, and further comprises SiO<SUB>2</SUB>+B<SUB>2</SUB>O<SUB>3</SUB>+Al<SUB>2</SUB>O<SUB>3</SUB>+BaO in a total amount of 81% or over.
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