Patent ID: 6756748
Filing Date: 2004-06-29
Classification: H01J

Abstract:
An electron gun for a color cathode-ray tube, comprising:a triode unit emitting an electron beam, said triode unit including a cathode, a control electrode, and a screen electrode; and first and second focusing electrodes, installed coaxially with said triode unit, for forming at least one quadrupole lens, protruding portions including flat surfaces corresponding to opposite surfaces of said first and second focusing electrodes are formed on at least one of the opposite surfaces of said first and second focusing electrodes to change the profile of the electron beam by applying a dynamic focus voltage to the edge of electron beam passing holes formed in the opposite surfaces, wherein vertically elongated electron beam passing holes are formed in said first focusing electrode and horizontally elongated electron beam passing holes are formed in said second focusing electrode, first and second protruding portions are formed at the horizontally opposite sides of each of the vertically elongated electron beam passing holes, and third and fourth protruding portions are formed at the vertically opposite sides of each of the horizontally elongated electron beam passing holes, and first and second flat surfaces are formed at said first and second protruding portions, respectively, and third and fourth flat surfaces are formed at said third and fourth protruding portions, respectively, accommodating a formation of a quadruple lens for changing the profile of an electron beam when a dynamic focus voltage is applied.