Patent ID: 6661186
Filing Date: 2003-12-09
Classification: H01J

Abstract:
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&lE;1.4Aâˆ’0.2Bâˆ’2.7Câˆ’2D, A&lE;0.35 mm, whereA (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.