Patent ID: 6646370
Filing Date: 2003-11-11
Classification: H01J

Abstract:
A cathode-ray tube apparatus comprising:an electron gun assembly including, an electron beam generating section which generates electron beams, a main lens which focuses the electron beams generated by the electron beam generating section on a phosphor screen, a first quadrupole lens situated between the electron beam generating section and the main lens, and having a horizontal diverging function and a vertical focusing function, and a second quadrupole lens situated between the electron beam generating section and the main lens, and having a horizontal focusing function and a vertical diverging function; and a deflection yoke which generates deflection magnetic fields that horizontally and vertically deflect the electron beams emitted from the electron gun assembly, wherein the electron gun assembly includes at least one multi-polar lens that is created in accordance with deflection of the electron beams, said at least one multi-polar lens is created by two mutually opposing grids, said two mutually opposing grids including non-circular electron beam passage holes in their mutually facing surfaces, and each of the electron beam passage holes including a waist portion which minimizes a horizontal or vertical dimension of a region for passing the associated electron beam.