Contrast enhancement filter for color CRT display devices
Abstract
Abstract A glass filter for contrast enhancement in a color CRT display devices comprises 100 parts by weight of a base glass comprising, in % by weight 3 to 70% SiO 2 , 0 to 40% B 2 O 3 , 0 to 23% Al 2 O 3 , 0 to 23% R 2 O (R 2 O being at least one selected from the group consisting of Li 2 O, Na 2 O and K 2 O), 2 to 35% RO (RO being at least one selected from the group consisting of MgO, CaO, SrO, BaO, ZnO and PbO), 0 to 10% TiO 2 , 0 to 10% ZrO 2 , 0 to 35% La 2 O 3 and 5 to 40% Nd 2 O 3 , at least two coloring components selected form the group consisting of 6 parts by weight or less CeO 2 , 1.0 parts by weight or less CuO, 3.5 parts by weight or less MnO 2 , 0.15 parts by weight or less CoO, 3.0 parts by weight or less Fe 2 O 3 , 1.5 parts by weight or less NiO and 5.0 parts by weight or less Pr 6 O 11 , and at least one coloring component selected form the group consisting of CeO, CuO, MnO 2 and CoO.
Inventors
- 👤 Toshiharu Yamashita
Bibliographic Details
Claims Analysis
Total Claims: 8References Cited (Backward Citations)
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