Patent ID: 6586869
Filing Date: 2003-07-01
Classification: H01J

Abstract:
In-line electrodes of an electron gun for forming a main lens in a cathode ray tube, said cathode ray tube having a cathode for generating three electron beams, said in-line electrodes comprising:a first focusing electrode and a second focusing electrode, said first focusing electrode comprising: a first outer rim electrode having a first large electron beam passing aperture for passing, in common, three electron beams to said second focusing electrode; and a first inner electrode disposed inside said first outer rim electrode, said first inner electrode having three small electron beam passing apertures for passing corresponding ones of said three electron beams to said first large electron beam passing aperture of said first outer rim electrode; and said second focusing electrode comprising: a second outer rim electrode having a second large electron beam passing aperture for passing, in common, three electron beams received from first large electron beam passing aperture of said first focusing electrode; and a second inner electrode disposed inside said second outer rim electrode, said second inner electrode having three small electron beam passing apertures for passing corresponding ones of said three electron beams received via said second large electron beam passing aperture of said second outer rim electrode, wherein a central one of said three small electron beam passing apertures of said first inner electrode has a diameter larger than a diameter of a central one of said three small electron beam passing apertures of said second inner electrode.