Patent ID: 6437495
Filing Date: 2002-08-20
Classification: H01J

Abstract:
A color cathode-ray tube, comprising:a vacuum envelope including a panel having a substantially rectangular effective portion, a funnel connected to the panel, and a phosphor screen formed on an inner surface of the effective portion of the panel; a shadow mask disposed within the vacuum envelope to face the phosphor screen, the shadow mask including a substantially rectangular mask main body having a curved effective surface formed with a large number of electron-beam passage apertures and facing the phosphor screen, a non-aperture portion surrounding an outer periphery of the effective surface, and a skirt portion formed in a bent on an outer periphery of the non-aperture portion; and a substantially rectangular mask frame fixed to the skirt portion of the mask main body; and an electron gun disposed within a neck of the funnel for emitting electron beams to the phosphor screen through the shadow mask; the mask main body having a long axis extending in a horizontal direction and crossing with a tube axis, and a short axis extending in a vertical direction and crossing with both the tube axis and the long axis, and the effective surface, or the effective surface and the non-aperture portion of the mask main body being formed in a curved surface which is convex to the phosphor screen and has a radius of curvature in the short axis direction, and at each long side of the mask main body, an end portion of the short axis of the effective surface or the non-aperture portion is recessed from any other adjacent part, in a direction leaving from the phosphor screen along the tube axis, at each long side of the mask main body, the recess at the part of the short axis end of the effective surface or the non-aperture portion being larger than the recess at other parts.