Patent ID: 6628061
Filing Date: 2003-09-30
Classification: H01J

Abstract:
An electron gun for a cathode ray tube comprising:a triode having cathodes, a first grid, and a second grid; at least one third grid having a single aperture through which R, G, and B electron beams emitted from the cathodes commonly pass; a fourth grid opposing the third grid and forming a main focus lens with the third grid; a shield cup connected to the fourth grid and supplying a high voltage to the fourth grid; and a correction grid disposed between the fourth grid and the shield cup and having R, G, and B beam through holes, wherein the R, G, and B beam through holes have respective centers lying on a first straight line, the R and B beam through holes have respective trapezoidal shapes that are asymmetrical about respective second straight lines, transverse to the first straight line, and passing through the centers of the R and B beam through holes, respectively, and the trapezoidal shapes of each of the R and B beam through holes have respective inner edges near the G beam through hole, parallel to the second straight lines, and longer than respective outer edges of the R and B beam through holes that are further from the G beam through hole than the inner edges and that are parallel to the second straight lines.