Patent ID: 6909227

Claim:
A color cathode ray tube comprising: a panel having a fluorescent surface therein; a funnel coupled sealingly with the panel; electron guns installed in the funnel, for projecting electron beams; a deflection yoke for deflecting the electron beams; and a shadow mask for selecting colors, wherein the shadow mask satisfies the following relation: 5.5 < Rh ( H 2 ) < 8.0 , where Rh is a mean curvature radius in the direction of the long axis of the shadow mask, H is a distance between both ends in a direction of a long axis of an effective surface of the shadow mask, and a mean curvature radius in the direction of the long axis satisfies the following condition: Rh = ( H 2 ) 2 + Zh 2 2 * Zh , where Zh is a recess amount in a direction of a tube axis at an end of the long axis of the effective surface with respect to a center of the effective surface.