| 摘要 |
An optical glass, comprising, denoted as cation percentages: a content of Si4+ and B3+ (35 to 55); a combined content of La3+, Gd3+, and Y3+ (30 to 55), wherein Gd3+ is 5 to 20%; a content of Ti4+, Nb5+, Ta5+ and W6+ (7 to 20); Zr4+ (2 to 8); and Zn2+ (0 to 10); wherein a cation ratio of Zn2+ to Gd3+ is 0 to 0.80; a cation ratio of Gd3+ to Ti4+, Nb5+, Ta5+, and W6+ combined is 0.65 to 2.00; a cation ratio of Ta5+ to Ti4+, Nb5+, Ta5+, and W6+ combined is 0 to 0.30; a cation ratio of Ti4+ to Ti4+, Nb5+, Ta5+, and W6+ combined is 0.30 to 0.90; and a refractive index nd is 1.890 to 1.950, and an Abbé number nud of equal to or lower than 39.0, the Abbé number nud satisfying a relation of nud>=(2.334-nd)/0.012 relative to nd.
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