Color cathode ray tube having a high-resolution electron gun

A color cathode ray tube comprising:

• a vacuum envelope including a panel, a neck and a funnel for connecting said panel and said neck,
• an electron gun housed in said neck and including a cathode structure for emitting three electron beams, a first electrode closely spaced from said cathode structure and serving as a control electrode, a second electrode serving as an accelerating electrode and a plurality of focus electrodes and an anode arranged in spaced relationship in a direction of travel of said three electron beams in the order named,
• a phosphor screen formed on an inner surface of said panel and composed of repeating patterns of three-color phosphor elements facing said electron gun,
• a color selection electrode positioned in said vacuum envelope between said electron gun and said phosphor screen, and
• a deflection yoke mounted around said vacuum envelope for scanning said three electron beams on said phosphor screen;
• the following inequalities being satisfied
• {(L+1360×D−600)/280}2+{(P−0.16)/0.06}2≦1, L+1360×D≧600, and
• P≧0.16,
• where D (mm) is a horizontal diameter of electron beam apertures in said first electrode,
• L (mm) is a distance from a midplane between said anode and one of said plurality of said focus electrodes adjacent to, but spaced from said anode, to a center of said phosphor screen, and
• P (mm) is a horizontal center-to-center distance between a first phosphor element of a first color of said three-color phosphor elements in a first horizontal row of said repeating patterns and a second phosphor element of said first color which is nearest to said first phosphor element and is in a second horizontal row adjacent to said first horizontal row, at said center of said phosphor screen.