Glass envelope for a cathode-ray tube

A glass envelope for a cathode-ray tube having a tube axis comprising:

• a glass panel section including a faceplate and a skirt, said faceplate having two face surfaces on opposite sides of said faceplate, a substantially rectangular shape with long and short sides, a curved inner surface on one face surface thereof and a curved outer surface on the other face surface thereof, and said skirt extending from a peripheral portion of said faceplate along the tube axis,
• said inner surface including a first inner surface radius of curvature Rsi set within a first plane including the tube axis and passing through center points of long sides of said faceplate, a second inner surface radius of curvature Rli set within a second plane including the tube axis and passing through center points of short sides of said faceplates and a third inner surface radius of curvature Rdi set within a third plane including the tube axis and a diagonal line connecting a pair of diagonally opposite corners of said faceplate,
• said outer surface including a first outer surface radius of curvature Rso set within said first plane, a second outer surface radius of curvature Rlo set within said second plane and a third outer surface radius of curvature Rdo set within said third plane, and
• said inner and outer surface radii of curvature being defined by the following inequalities (1) and (2), respectively:
• Rsi<Rli and Rsi<Rdi (1),
• Rso<Rlo and Rso<Rdo (2).