Color cathode ray tube

A color cathode ray tube comprising:

• a panel having a substantially rectangular effective portion with an outside face that is almost flat and an inside face that has a curvature in a direction of a minor axis near short sides of the effective portion;
• and
• a fluorescent substance screen having a substantially rectangular effective region formed on the inside face of the effective portion of the panel,
• wherein long sides of the outer circumference of the effective region are almost straight and the short sides of the outer circumference of the effective region project toward the center of the effective region to form a curved surface.

A color cathode ray tube comprising:

• a panel having a substantially rectangular effective portion with an outside face that is nearly flat and an inside face that has a curvature in a direction of minor axis near short sides of the effective portion;
• and
• a fluorescent substance screen having a substantially rectangular effective region formed on the inside face of the effective portion of the panel,
• wherein the short sides in an outer circumference of the effective region are curved so as to project toward the center of the effective region, the short sides having a prescribed curvature rate that is defined as (%)=(d/y)×100, where d is a difference between one-half a length of a long side of the effective region and one-half a major-axis diameter, y is the length of the short side.