Optical glass and optical product using the same

摘要

An optical glass having a high refractive index and high dispersion characteristics suitable for application to precision press molding to precisely mold final products without requiring grinding or polishing. An optical glass can be prepared exhibiting a refractive index in the range of from 1.75 to 2.0, and an Abbé number in the range of from 20 to 28.5. Optical parts comprised of this glass; press-molding materials comprised of this glass; methods of manufacturing the same; and methods of manufacturing molded glass products employing these materials. A suitable optical glass is composed of the following in molar percent: 15-30% P₂O₅; 0.5-15% B₂O₃; 5-25% Nb₂O₅; 6-40% WO₃; 4-45% of at least one of Li₂O, Na₂O or K₂O; 1-5% K₂O; 2-9% TiO₂; and 0-30% (excluding 30%) of at least one RO selected from among BaO, ZnO, and SrO; with the total content of the above-stated components being equal to or more than 95 percent.