Color cathode-ray tube with nonspherical curved shadow mask

A color cathode-ray tube comprising:

• a substantially rectangular panel;
• a phosphor screen formed on the inner surface of the panel;
• and
• a shadow mask including a mask body having a substantially rectangular effective surface, a radius of curvature for the effective surface decreasing in a vertical direction from an effective surface center toward at least one of an upper and lower edge of the effective surface,
• wherein the radius of curvature for the effective surface increases from a vertical center of the effective surface toward at least one of an upper and lower edge of the effective surface, along a vertical axis that is offset from a horizontal center of the effective surface.

A color cathode-ray tube comprising:

• a substantially rectangular panel;
• a phosphor screen formed on the inner surface of the panel;
• and
• a shadow mask including a mask body having a substantially rectangular effective surface, a radius of curvature for the effective surface decreasing in a vertical direction from an effective surface center toward at least one of an upper and lower edge of the effective surface,
• wherein the radius of curvature for the effective surface decreases in a horizontal direction from an effective surface center to a portion of the effective surface located between the effective surface center and a lateral edge of the effective surface, and
• wherein the radius of curvature for the effective surface increases from a vertical center of the effective surface toward at least one of an upper and lower edge of the effective surface, along a vertical axis that is offset from a horizontal center of the effective surface.

A color cathode-ray tube comprising:

• a substantially rectangular panel;
• a phosphor screen formed on the inner surface of the panel;
• and
• a shadow mask including a mask body having a substantially rectangular effective surface, a radius of curvature for the effective surface increasing from a vertical center of the effective surface toward at least one of an upper and lower edge of the effective surface, along a vertical axis that is offset from a horizontal center of the effective surface.