Patent ID: 7598189
Filing Date: 2009-10-06
Classification: C03B,C03C

Abstract:
1. Phosphate optical glass having an Abbé number, νd, of greater than 59 and less than 70, comprising the following components, denoted as mass percentages: P B Al Li Na K MgO: 0 to 25 percent, where 0 percent is excluded; CaO: 0 to 18 percent, where MgO+CaO>4 percent; SrO: 0 to 20 percent; BaO: 0 to 40 percent, where SrO+BaO>1 percent and BaO/B ZnO: 0 to 14 percent, where the ratio of ΣR″O/ΣR′O as a mass percentage ratio is less than 23, where ΣR″O═MgO+CaO+SrO+BaO+ZnO and ΣR′0═Li 2 O+Na 2 O+K 2 O; Gd Sb wherein any other component besides those listed above has a content lower than the content of B