Contrast enhancement filter for color CRT display devices
US4521524A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 21, 1982 |
| Grant date | Jun 4, 1985 |
| Priority date | — |
| Expiry date | Sep 21, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/863
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A glass filter for contrast enhancement in a color CRT display devices comprises PA0 100 parts by weight of a base glass comprising, in % by weight PA1 3 to 70% SiO.sub.2, PA1 0 to 40% B.sub.2 O.sub.3, PA1 0 to 23% Al.sub.2 O.sub.3, PA1 0 to 23% R.sub.2 O (R.sub.2 O being at least one selected from the group consisting of Li.sub.2 O, Na.sub.2 O and K.sub.2 O), PA1 2 to 35% RO (RO being at least one selected from the group consisting of MgO, CaO, SrO, BaO, ZnO and PbO), PA1 0 to 10% TiO.sub.2, PA1 0 to 10% ZrO.sub.2, PA1 0 to 35% La.sub.2 O.sub.3 and PA1 5 to 40% Nd.sub.2 O.sub.3, PA0 at least two coloring components selected form the group consisting of 6 parts by weight or less CeO.sub.2, 1.0 parts by weight or less CuO, 3.5 parts by weight or less MnO.sub.2, 0.15 parts by weight or less CoO, 3.0 parts by weight or less Fe.sub.2 O.sub.3, 1.5 parts by weight or less NiO and 5.0 parts by weight or less Pr.sub.6 O.sub.11, and PA0 at least one coloring component selected form the group consisting of CeO, CuO, MnO.sub.2 and CoO.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.