High absorbance Pb-containing glass for cathode ray tube picture screen
AssigneeSchott Glaswerke
InventorsBurkhard Speit, Karl Mennemann, Georg Gliemeroth
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Abstract
These objects have been attained by providing highly absorbent lead containing alkali metal silicate glasses for cathode ray tube image screens, having a linear absorption coefficient .mu. of >30 cm.sup.-1 (0.6 .ANG.) and with a high resistance to discoloration by X-ray and electron radiation, comprises, in weight percent: ______________________________________ SiO.sub.2 20-65% P.sub.2 O.sub.5 + B.sub.2 O.sub.3 + Al.sub.2 O.sub.3 0-30% Li.sub.2 O 0-5% Na.sub.2 O 0-10% K.sub.2 O 0-15% MgO + CaO + ZnO 0-15% SrO 0-20% BaO 0-40% PbO 5-60% ZrO.sub.2 0-10% CeO.sub.2 0.1-5% Other Components 0-20%. ______________________________________
Claims14
A highly absorbent lead-containing alkali metal silicate glass useful for cathode ray tube image screens, having a linear X-ray absorption coefficient .mu. of >30 cm.sup.-1 (0.6.ANG.), and a high resistance to discoloration by X-ray and electron radiation, consisting essentially of, in weight percent:
- ______________________________________ SiO.sub.2 30-60% P.sub.2 O.sub.5 + B.sub.2 O.sub.3 + Al.sub.2 O.sub.3 0-15% Li.sub.2 O 0-5% Na.sub.2 O 1-2.9% 5-10.8% K.sub.2 O 4-8.5% MgO + CaO + ZnO 0-8% SrO + BaO 0-40% 20-60% PbO 5-50% ZrO.sub.2 0-8% CeO.sub.2 1.0-3.5% and 0-20% in total of La.sub.2 O.sub.3 + Y.sub.2 O.sub.3 + 0-15% Bi.sub.2 O.sub.3 + SnO S + Se + Te 0-5% F + Cl + Br + SO.sub.4 0-3% TiO.sub.2 0-5% rare earth metal oxides 0-3% atomic numbers 58-91 Fe.sub.2 O.sub.3 + Cr.sub.2 O.sub.3 + 0-1% MnO + NiO + CoO As.sub.2 O.sub.3 + Sb.sub.2 O.sub.3 0-2%. ______________________________________
Dependencies are inferred from the claim text.