Color cathode ray tube having particular effective inner panel surface and shadow mask effective surface shapes

A color cathode ray tube including an envelope extending from a rear tube portion to an opposed front tube portion including a substantially rectangular effective panel portion having an effective outer surface portion that is flat or only slightly curved and an effective inner surface portion, a shadow mask having an effective mask surface with apertures therein, an electron beam gun inside the envelope and spaced from the shadow mask along a tube axis in a direction toward said rear tube portion, said electron beam gun being configured to generate electron beams, at least some of which pass through the apertures toward the effective inner surface portion,

• wherein the effective mask surface has an associated major axis and associated major axis coordinate defining a relative position of a major end point of the effective mask surface portion and an associated minor axis and associated minor axis coordinate defining a relative position of a minor end point of the effective mask surface, said major axis and said minor axis intersecting said tube axis at a central point on the effective mask surface, with the major end point relative position and the minor end point relative position including a tube axis coordinate in addition to coordinates related to the other axes, and with the tube axis coordinate of the major end point being spaced from the tube axis coordinate of the central point a distance measured on the tube axis toward the rear tube portion that is less than the distance of spacing of the minor end point from the central point measured toward the rear tube portion on said tube axis.