Patent ID: 6441566
Filing Date: 2002-08-27
Classification: H01J

Abstract:
A color cathode ray tube comprising:a vacuum envelope including a substantially rectangular face panel having a substantially flat outer surface and an inner surface with a phosphor screen formed thereon, short and long axes orthogonal to a tube axis and orthogonal to each other, a pair of long sides substantially parallel to the long axis and a pair of short sides substantially parallel to the short axis; a shadow mask arranged within the vacuum envelope to face the phosphor screen; and an electron gun provided within the vacuum envelope, for emitting electron beams onto the phosphor screen through the shadow mask, wherein the thickness of the face panel is so formed as to be greater at a peripheral edge portion than at a center portion of the face panel, a curvature radius in the short axis direction on the long axis at the inner surface of the face panel has a minimal value at a position spaced from a center of the face panel more toward the long axis end side than L/2, provided that a distance from the center to the long axis end of the face panel is L, and the face panel satisfies the following relations: TD<2.5TC TV<2.0TC â€ƒTH<2.0TCwhereTC: the thickness of the face panel at the center portion; TD: the thickness of the face panel at a diagonal axis effective dimension end; TV: The thickness of the face panel at a short axis effective dimension end; and TH: the thickness of the face panel at a long axis effective dimension end.