Color cathode ray tube

A color cathode ray tube comprising:

• a vacuum chamber having a panel, a funnel, a neck and a tube axis, said panel having a face plate with a substantially rectangular effective curved surface and an inner surface, and the tube axis being defined as a Z axis, and major- and minor- axis directions being respectively defined as X and Y axes having the center of said face plate through which the Z axis passes as an origin, and on said face plate, a radius of curvature at the center of said effective curved surface of said face plate in a section taken along an X-Z parallel plane being larger than a radius of curvature at an effective diameter edge portion on the Y axis, and a radius of curvature at an effective diameter edge portion on the X axis being smaller than a radius of curvature at a diagonal effective diameter edge portion, said funnel having a funnel shape and being contiguous with a skirt of said panel, and said neck being formed into a substantially cylindrical shape and being contiguous with said funnel;
• a phosphor screen formed on said inner surface of said face plate;
• an electron gun assembly, arranged in said neck, for emitting three electron beams which impinge on said phosphor screen;
• deflection means for deflecting the electron beams;
• a shadow mask arranged in said panel so as to oppose said phosphor screen and having a substantially rectangular effective curved surface and apertures for allowing the three electron beams from said electron gun assembly to pass therethrough;
• and
• supporting means for supporting said shadow mask.

A color cathode ray tube comprising:

• a vacuum chamber including a panel, a funnel, a neck, and a tube axis, and in which said panel has a face plate having a substantially rectangular front surface and an inner surface, said funnel being formed into a funnel shape and being contiguous with a skirt of said panel, and aid neck being formed into a substantially cylindrical shape and being contiguous with said funnel;
• a phosphor screen formed on said inner surface of said face plate;
• an electron gun assembly, arranged in said neck, for emitting three electron beams which impinge on said phosphor screen;
• deflection means for deflecting the three electron beans;
• a shadow mask arranged in said panel to oppose said phosphor screen and having a substantially rectangular effective curved surface and apertures for allowing the three electron beams from said electron gun assembly to pass therethrough;
• in said panel, said tube axis is defined as a Z axis and major- and minor-axis directions are respectively defined as X and Y axes having a center through which the Z axis passes as an origin, a difference between a thickness at an effective diameter edge portion and a thickness on the X axis in a section of said panel taken along a Y-Z parallel plane moved in the X-axis direction being maximum at a position between the center of said panel and the effective diameter edge portion on the X axis;
• and
• supporting means for supporting said shadow mask.

A color cathode ray tube comprising:

• a vacuum chamber including a panel, a funnel, a neck and a tube axis, said panel having a face plate having a substantially rectangular effective curved surface and an inner surface, said tube axis being defined as a Z axis, and major- and minor- axis direction being respectively defined as X and Y axes having a center of said face plate through which the Z axis passes as an origin, on said face plate, a radius of curvature at the center of said effective curved surface of said face plate in an section taken along an X-Z parallel plane being larger than a radius of curvature at an effective diameter edge portion on the Y axis, and a radius of curvature at an effective diameter edge portion on the X axis being smaller than a radius of curvature at a diagonal effective diameter edge portion, said funnel having a funnel shape and being contiguous with a skirt of said panel, and said neck being a substantially cylindrical shape and being contiguous with said funnel;
• a phosphor screen formed on said inner surface of said face plate;
• an electron gun assembly, arranged in said neck, for emitting three electron beams which impinge on said phosphor screen;
• deflection means for deflecting the electron beams;
• a shadow mask arranged in said panel so as to oppose said phosphor screen, and having a substantially rectangular effective curved surface and apertures for allowing the three electron beams from said electron gun assembly to pass therethrough, and on which a radius of curvature at a center of said effective curved surface of said shadow mask in a section taken along an X-Z parallel plane is larger than a radius of curvature at an effective diameter edge portion on the Y axis, and a radius of curvature at an effective diameter edge portion on the X axis is smaller than a radius of curvature at a diagonal effective diameter edge portion;
• and
• supporting means for supporting said shadow mask.