| 摘要 |
A novel lead-free optical heavy crown or double-heavy crown glass, with a refractive index (nd) of 1.60-1.65 and an Abbe index (vd) of 50-60, has the composition (by wt., on oxide basis) 20-37% SiO2, 8-20% B2O3, 43-55% BaO, 0.01-10% ZnO, 0-7% CaO, 0-7% MgO, 0.01-5% TiO2, 0.01-7% ZrO2, 0.1-10% Al2O3, 0-8% Na2O, 0-8% K2O, less than 3% La2O3, 0-1% F<->, 0-3% P2O5 and optionally usual amounts of refiners, the sum of CaO + MgO being 0-7%, the sum of BaO + ZnO + CaO + MgO being less than 60% and the sum of Na2O + K2O being 0-8%.
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| 申请人 |
SCHOTT GLAS, 55122 MAINZ, DE |
发明人 |
KUNERT, CHRISTIAN, 55118 MAINZ, DE;CLEMENT, MARC, DR., 55118 MAINZ, DE;KOLBERG, UWE, DR., 55118 MAINZ, DE;GRABOWSKI, DANUTA, 65232 TAUNUSSTEIN, DE;WINKLER-TRUDEWIG, MAGDALENA, 55126 MAINZ, DE;WOELFEL, UTE, 55129 MAINZ, DE;WEITZEL, ALWIN, 55120 MAINZ, DE |
