Optical glass, press-molding glass material, optical element and method of manufacturing the same, and bonded optical element

摘要

An aspect of the present invention relates to an optical glass, which comprises, denoted as weight percent, 2 to 37 percent of SiO2, 0 to 25 percent of B2O3, 0 to 10 percent of GeO2, 18 to 55 percent of a combined content of Li2O, Na2O, K2O, CaO, SrO, and BaO, and 27 to 55 percent of a combined content of TiO2, Nb2O5, and WO3, wherein the weight ratio of SiO2 content relative to a combined content of SiO2 and B2O3 ranges from 0.1 to 1, a weight ratio of the Li2O content to a combined content of Li2O, Na2O, K2O, CaO, SrO, and BaO ranges from 0 to 0.4, and a weight ratio of TiO2 content relative to a combined content of TiO2, Nb2O5, and WO3 ranges from 0.35 to 1, with a refractive index nd of 1.860 to 1.990 and an Abbé number νd of 21 to 29.

主权项

1. An optical glass, which comprises, denoted as weight percent,
2 to 37 percent of SiO2, 0 to 25 percent of B2O3, 0 to 10 percent of GeO2, 18 to 55 percent of a combined content of Li2O, Na2O, K2O, CaO, SrO, and BaO, 33.78 to 55 percent of a combined content of TiO2, Nb2O5, and WO3, and 0 to 15 percent of La2O3; wherein the weight ratio of SiO2 content relative to a combined content of SiO2 and B2O3 (SiO2/(SiO2+B2O3) ranges from 0.1 to 1; a weight ratio of the Li2O content to a combined content of Li2O, Na2O, K2O, CaO, SrO, and BaO (Li2O/(Li2O+Na2O+K2O+CaO+SrO+BaO) ranges from 0 to 0.4; and a weight ratio of TiO2 content relative to a combined content of TiO2, Nb2O5, and WO3 (TiO2/(TiO2+Nb2O5+WO3) ranges from 0.35 to 1; a specific gravity being equal to or less than 4.3; and which has a refractive index nd ranging from 1.87939 to 1.990 and an Abbé number νd ranging from 21 to 29.