Patent ID: 6744190
Filing Date: 2004-06-01
Classification: H01J

Abstract:
A cathode ray tube having a longitudinal axis, a phosphor screen, and an electron gun arranged around the longitudinal axis, wherein the electron gun comprises a triode part having three cathodes for generating a red electron beam, a green electron beam and a blue electron beam, a pro-focusing grid having a green beam aperture, a red beam aperture, and a blue beam aperture, and a focus lens part having at least two common grids with green beam, red beam and blue beam apertures,wherein the cathode for generating the green electron beam is offset from the longitudinal axis, wherein a green beam aperture in the focus lens is eccentric with respect to the green aperture in the pro-focusing grid; and wherein the pre-focusing grid and the focus lens are configured such that a trajectory of the green electron beam has a kink adjacent the pro-focusing grid so as to pass through the focus lens.