OPTICAL GLASS Russian patent published in 1995 - IPC

FIELD: optics. SUBSTANCE: proposed glass contains (mass): silicium oxide having essential formula SiO₂ 43-50, potassium oxide having essential formula K₂O 5-15, sodium oxide having essential formula Na₂O 5-15, titanium oxide having essential formula TiO₂ 20-30, calcium oxide having essential formula CaO 2-10, antimony oxide having essential formula Sb₂O₃ 0.5-5, summary content of K₂O + Na₂O being 20-24, molar ratio K₂O + Na₂O/TiO₂ being 0.75-1. Said glass may contain at least one of component being chosen of group which includes zerium oxide with essential formula CeO ₂, arsenic oxide with essential formula As₂O₃, their quantities being 0.3-0.5 mass and one component being chosen of group which includes barium oxide having essential formula BaO, zirconium oxide having essential formula ZrO₂ and niobium oxide having essential formula Nb₂O₅, their quantities being 2-5 mass Index of refraction thus prepared glass is 1.64-1.67, its density being 2,73-2,8 g/cm³. EFFECT: improves quality of desired product. 3 cl