Patent ID: 7176611

Claim:
A color CRT having a panel of which outer surface is substantially flat and inner surface has a predetermined curvature and a funnel coupled to a rear side of the panel, wherein an aspect ratio of an effective surface of the panel is 4:3, a diagonal size (U) of the effective surface is 570 mm˜700 mm, and a following condition is satisfied: −1.7168 *Ln ( U /1 mm)+11.627≦( Rh*Rv*Ro/U ) *Tc≦− 2.0131 *Ln ( U/ 1 mm)+13.645, wherein a value obtained by dividing an inner curvature radius Rx of the effective surface of the panel following a long axis (X) by a distance Lx of the effective surface of the panel following a 1.767*long axis is Rh, a value obtained by dividing an inner curvature radius Ry of the effective surface of the panel following a short axis (Y) by a distance Ly of the effective surface following a 1.767*short axis is Rv, a value obtained by dividing an inner curvature radius of the effective surface of the panel following a diagonal axis (D) by a distance Ld of the effective surface following 1.767*diagonal axis is Ro, and the thickness of the center point of the panel is Tc; wherein a following condition is satisfied: 10 mm≦Tc≦12.4 mm.