Glass screen for cathode ray tube has a layer formed by chemical consolidation on end regions of short axis and/or end regions of long axis of the outer surface of front region and on the central region of inner surface of front region

摘要

Glass screen has a linear absorption coefficient of 30-38 cm<-1> for X -rays having a wavelength of 0.06 nm and a layer with a compressive strain of at least 70 MPa formed by chemical consolidation on the end regions of the short axis and/or end regions of the long axis of the outer surface of a front region and on the central region of the inner surface of the front region. Preferred Features: The thickness of the layer is at least 30 mu m. The screen is made from a material of the following composition: 53.0-65.0 % silica (SiO2), 0.5-5.0 % alumina (Al2O3), 3.0-13.0 % sodium oxide (Na2O), 1.0-9.0 % potassium oxide (K2O), 3.0-8.6 % strontium oxide (SrO), 5.0-12.0 % barium oxide (BaO), 0.4-9.0 % zinc oxide (ZnO), 0.5-5.0 % zirconia (ZrO), 0.1-0.6 % titania (TiO2), 0.1-0.9 % ceria (CeO2), 0.0-3.0 % lithium oxide (Li2O), 0.0-4.0 % calcia (CaO), 0.0-04.0 % magnesia (MgO), 0.0-3.0 % tungsten trioxide ( WO3), and 2.5-11.0 % ZnO + ZrO2.