Color cathode ray tube, driving circuit therefor, color image reproducing device employing the driving circuit, and color image reproducing system including the color image reproducing device

A color cathode ray tube having a phosphor screen and an electron gun,

• said electron gun comprising:
• a triode section including three transversely-spaced in-line cathodes adapted to be supplied with video signals, a first grid electrode and a second grid electrode arranged in the order named;
• and
• a plurality of electrodes for focusing three electron beams emitted from said triode section onto said phosphor screen,
• wherein the following inequalities are satisfied:
• E≦1.4A−0.2B−2.7C−2D,
• A≦0.35 mm,
• where
• A (mm) is a diameter of an electron-beam transmissive aperture in said first grid electrode,
• B (mm) is a diameter of an electron-beam transmissive aperture in said second grid electrode,
• C (mm) is a thickness of a portion of said first grid electrode immediately surrounding said electron-beam transmissive aperture in said first grid electrode,
• D (mm) is a spacing between said three transversely-spaced in-line cathodes and said electron-beam transmissive aperture in said first grid electrode, and
• E (mm) is a spacing between said first grid electrode and said second grid electrode.