| 摘要 |
PURPOSE:To obtain the titled glass whose chromaticity range of light color is specified, whose transmissivity of visible rays at the long wave side is low and whose blue color can be recognized clearly even if it is foggy, by adding CuO and CaO to the base glass whose essential ingredients are SiO2 and BaO. CONSTITUTION:The base glass containing, by weight percent, 55-70% SiO2, 0-5% B2O3, 0-5% Al2O3, 0-5% MgO, 0-8% CaO, 0-10% ZnO, 0-5% PbO, 5-15% MgO+CaO+ZnO+PbO, 5-30% BaO, 0-10% Na2O, 0-10% K2O and 3-15% Na2O+K2O. And, 0.4-2.5%wt% CuO and 0.03-0.15wt% CoO are added to 100wt% of this base glass to obtain the blue glass for the aeronautical sign lamp whose chromaticity range of light color is y=0.805x+0.065, y=0.4-x, x=0.6y+0.133, y=0.12 and whose transmissivity of the visible wave length region >=about 600nm is <=1%.
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