Optical glass

Abstract

Abstract PURPOSE: To obtain an optical glass having a high refractive index, a low dispersity, a high stability against devitrification, and excellent chemical durability by adding given amounts of SiO 2 and alkaline earth metal oxides to requisite specific components, e.g., B 2 O 3 , La 2 O 3 , etc. CONSTITUTION: An optical glass contains 11W33wt% B 2 O 3 , 26W50wt% La 2 O 3 , 6W24wt% Y 2 O 3 , 1W12wt% ZrO 2 , 1W33wt% Ta 2 O 3 , 5.5W31wt% WO 3 , and 5.2W11wt% ZnO as requisite components, together with 0W6wt% SiO 2 , 0W5wt% an alkaline earth metal oxide, 0W8wt% Nb 2 O 5 , 0W8wt% TiO 2 , and 0W8wt% PbO. The optical glass, having a refractive index of 1.76W1.92 and an Abbe number of 35W48, is stable against devitrification, excellent in chemical durability, and of a practical light transmittivity and also contains no harmful radioactive Th for human body, as in the case of the conventional products. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Shizuo Matsumaru
• 👤 Kazufumi Ishibashi

Bibliographic Details