Patent ID: 6236152
Filing Date: 2001-05-22
Classification: H01J

Abstract:
A color cathode ray tube apparatus comprising:an inline type electron gun assembly of inline type for emitting three electron beams including a center electron beam and a pair of side electron beams, which travel in the same horizontal plane; anda deflection yoke for generating magnetic fields for deflecting the three electron beams, thereby to scan a target with the three electron beams,said electron gun assembly comprising:an electron beam generating section comprising a center beam cathode and first and second side beam cathodes for emitting the three electron beams,a control electrode for controlling the center electron beam and the side beams, an accelerating electrode for accelerating the center electron beam and the side electron beams, anda focusing electrode opposing the accelerating electrode, for focusing the center electron beam and the side beams, in which the control electrode, accelerating electrode and focusing electrode each have a first hole for guiding the center electron beam, a second hole for guiding one side electron beam and a third hole for guiding the other side electron beam, the center beam cathode and the first holes of the control electrode, accelerating electrode and focusing electrode have a first axis in common, the first side beam cathode and the second holes of the control electrode, accelerating electrode and focusing electrode have a second axis in common, the second side beam electrode and the third holes of the control electrode, accelerating electrode and focusing electrode have a third axis in common, and the second and third axes are spaced from the first axis by a first distance Sg0; anda main electron lens section of electric field extended type for focusing the electron beams on the target, the electron lens section comprising a first grid, second grid and a third grid, each having a center-beam guiding hole along the first axis, and in which the first grid has fourth and fifth holes for guiding the side electron beams, respectively, the second grid has sixth and seventh holes for guiding the side electron beams, respectively, the third grid has eighth and ninth holes for guiding the side electron beams, respectively, the fourth to ninth holes have fourth, fifth, sixth, seventh, eighth and ninth axes, respectively, the fourth and fifth axes are spaced from the first axis by a second distance Sg1, the sixth and seventh axes are spaced from the first axis by a third distance Sg3, and the eighth and ninth axes are spaced from the first axis by a fourth distance Sg2, and the first to fourth distances, Sg0, Sg1, Sg3 and Sg2 have the following relation:Sg1<Sg2.ltoreq.Sg3, orSg1.ltoreq.Sg2<Sg3wherein at least one of the distances Sg1, Sg2, Sg3 is smaller than the distance Sg0.