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US 5,204,292 AGranted
Optical glass for a press lens
AssigneeAlps Electric Co., Ltd.
InventorTooru Michimata
Life of this patent
Estimating the term…
Abstract
An optical glass for a press lens composed of 25 to 41 mol % of SiO.sub.2, 10 to 30 mol % of B.sub.2 O.sub.3, 18 to 40 mol % of PbO, 1 to 10 mol % of Na.sub.2 O, 1 to 15 mol % of K.sub.2 O, 2 to 20 mol % of Li.sub.2 O, and 0.3 to 3 mol % of Al.sub.2 O.sub.3.
Claims1
An optical glass for a press lens having a composition of 25 to 41 mol % of SiO.sub.2, 10 to 30 mol % of B.sub.2 O.sub.3 18 to 40 mol %, of PbO, 1 to 10 mol % of Na.sub.2 O, 1 to 15 mol % of K.sub.2 O, 16 to 20 mol %, of Li.sub.2 O, 0.3 to 3 mol %, of Al.sub.2 O.sub.3, and 0.1 to 3 mol % of Sb.sub.2 O.sub.3.
Dependencies are inferred from the claim text.