Color cathode ray tube

A color cathode ray tube, comprising;

• a rectangular panel having a slightly convex almost flat outer face and a concavely curved inner face satisfying the following conditions:
• 0.98<Rh/Rd<1.02, and
• 0.95<Rv/Rd<1.04
• wherein Rd is the radius of curvature along a diagonal of a screen effective surface area, Rh is the radius of curvature along an x-axis passing through a center of the screen effective surface area of the panel and parallel to a long side of the panel, and Rv is the radius of curvature on a y-axis passing through the center of the screen effective surface area and parallel to a short side of he panel.

A color cathode ray tube, comprising:

• a rectangular panel having a slightly convex almost flat outer face and an inner face satisfying the following conditions:
• 0.98<Rt/Rh<1.02, and
• 0.98<Rs/Rv<1.05
• wherein Rh is the radius of curvature along an x-axis passing through a center of a screen effective surface area of the panel and parallel to a long side of the panel, Rt is the radius of peripheral curvature along the long side of the panel, Rv is the radius of curvature along a y-axis passing through the center of the screen effective surface area and parallel to a short side of the panel, and Rs is the radius of peripheral curvature along the short side of the panel, and the panel is shaped so as to satisfy the condition:
• Rv/Ye>7
• where Ye is ½ of the length of short side of the panel.