Patent ID: 6670744
Filing Date: 2003-12-30
Classification: H01J

Abstract:
An electron gun for a color cathode ray tube comprising:means for generating three electron beams in a common plane; means for forming an auxiliary lens for focusing and accelerating the electron beams generated by the electron beam generating means; and means for forming a main lens, for focusing and accelerating the electron beams focused and accelerated by the auxiliary lens, and including first and second outer electrodes which face each other and which each include a large electron beam aperture through which all of the three electron beams pass, and first and second inner electrodes respectively located inside the first and second outer electrodes, each of the first and second inner electrodes having first, second, and third small electron beam apertures aligned side-by-side along an axis generally parallel to the common planes, wherein each of the small electron beam apertures has a composite shape defined by respective edges of the small electron beam apertures, and the edges define a generally rectangular shape with a pair of straight shorter sides generally parallel to the common plane and a pair of longer sides having straight portions, generally perrendicular to the common plane, and centrally located convex arcuate portions, so that each of the small electron beam apertures is widest in a central portion along the axis.