Electron gun for a color display apparatus

Details Electron gun for a color display apparatus Electron gun for a color display apparatus

H - Electricity

01

J

313/35.13, 313/3

H01J 29/50 (2006.01)

Patent

CA 1233868

ABSTRACT OF THE DISCLOSURE An improved electron gun beam for a three color gun which has a central cathode and side cathodes mounted on either side of the central cathode which produce beams for different colors which pass through first and second grids and a main electron lens and wherein the first and second grids are generally conically shaped so that they extend toward the central cathode and have further indentations in their central portion which extend toward the central cathode and wherein the thickness of the second grid at the center wherein the beam of the central cathode passes therethrough is less than at the portions of the second grid where the beams from the two side cathodes pass therethrough and also where the distance between the central cathode and the indented portion of the first grid is larger than the distance between the two side cathodes and the distance to the first grid and/or the distance between the second and first grids is larger at the portion where the central cathode beam passes therethrough than where the beams of the two side cathodes pass therethrough so as to provide optimum focusing voltage values and the voltage difference for optimum focusing for the respective beams is constant over the entire cathode current operating ranges.

496301

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