| 摘要 |
1,260,778. Optical glass compositions. ERNST LEITZ G.m.b.H. 13 Aug., 1970 [14 Aug., 1969], No. 39046/70. Heading C1M. Optical glass is fused from a mixture comprising in percentages by weight 28 to 40% of SiO 2 and GeO 2 , the proportion of GeO 2 exceeding 0% but not exceeding 20%, 14 to 40% of TiO 2 , 12 to 30% of oxides of Li, Na, K, Rb and Cs, 10 to 30% of PbO and up to 5% of B 2 O 3 , the balance, if any, consisting of other compatible constituents and impurities. Optionally the mixture may also contain up to 10% of WO 3 and up to 15% of Ta 2 O 5 . Examples are given.
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