Abstract: In a color cathode ray tube, a rectangular panel has a slightly convex outer face with a large radius of outward curvature so as to be almost flat and a concave inner face which satisfies the conditions 0.98<Rh/Rd<1.02, 0.95<Rv/Rd<1.04, 0.98<Rt/Rh<1.02, and 0.98<Rs/Rv<1.05, where Rd is the radius of diagonal curvature along a screen effective surface area, Rt is the radius of a long side peripheral curvature, Rs is the radius of a short side peripheral curvature, Rh is the radius of curvature along the x-axis passing through a center of the screen effective surface area and parallel to the long side, and Rv is the radius of curvature along the y-axis passing through the center of the screen effective surface area and parallel to the short side. Accordingly, distortion of a picture can be minimized by designing the internal curvature of the panel as an optimum shape, and a high picture quality can be obtained.

Abstract: In a color cathode ray tube, a rectangular panel has a slightly convex outer face with a large radius of outward curvature so as to be almost flat and a concave inner face which satisfies the conditions 0.98<Rh/Rd<1.02, 0.95<Rv/Rd<1.04, 0.98<Rt/Rh<1.02, and 0.98<Rs/Rv<1.05, where Rd is the radius of diagonal curvature along a screen effective surface area, Rt is the radius of a long side peripheral curvature, Rs is the radius of a short side peripheral curvature, Rh is the radius of curvature along the x-axis passing through a center of the screen effective surface area and parallel to the long side, and Rv is the radius of curvature along the y-axis passing through the center of the screen effective surface area and parallel to the short side. Accordingly, distortion of a picture can be minimized by designing the internal curvature of the panel as an optimum shape, and a high picture quality can be obtained.