Patent ID: 6404119
Filing Date: 2002-06-11
Classification: H01J

Abstract:
A color cathode ray tube apparatus comprising color cathode ray tube, said cathode ray tube comprising:a panel part having on its inside surface a phosphor film that emits three primary colors; a funnel-shaped funnel part, an expanded aperture of which is joined to said panel part; and a neck part that is joined to a reduced-aperture part of said funnel part and which houses an in-line arranged electron gun structure that emits three electron beams which cause said phosphor film to emit light, and a deflection yoke which deflects the electron beams in said color cathode ray tube, wherein said neck part comprises a main part that houses said electron gun structure and a reduced-diameter straight tube like part that has a diameter that is smaller than said main part and that is joined with said funnel part, said deflection yoke comprising a horizontal deflection coil and a vertical deflection coil, the envelope surface of said deflection yoke forming a coaxial parallel surface to a longitudinal axis of said reduced-diameter straight tube like part and an expanding inclined surface, and said deflection yoke being disposed along an outer surface of said reduced-diameter part and along said funnel inclination while maintaining a space between the outer surface of the reduced diameter part and the deflection yoke, and between the funnel inclination and the deflection yoke to increase image purity, and further wherein said outer diameter of said reduced-diameter part of said neck part is smaller than the outer diameter of said main part and larger than the outermost periphery of a path of an electron beam that is emitted from said electron gun structure, said outer diameter of said reduced-diameter part &phgr;a being established in the range from approximately 95% to approximately 75% of the outer diameter of said main part.