Electron gun for cathode-ray tube

Abstract

There is provided an electron gun for a cathode-ray tube, comprising a triode having a control electrode and an accelerating electrode for controlling the amount of electron beams emitted from a plurality of cathodes and accelerating the electron beams, a front focusing lens part configured of a plurality of electrodes focusing and accelerating a predetermined amount of the electron beams, and a main lens part configured of a plurality of electrodes for focusing the electron beams on a screen, in which the diameter of beam passage hole of the accelerating electrode of the triode corresponds to 140-220% of that of the control electrode. The thickness of the control electrode corresponds to 20-30% of the diameter of beam passage hole of the control electrode, and the distance between the control electrode and the accelerating electrode corresponds to 40-80% of the beam passage hole diameter of the control electrode. Accordingly, the spot size of the electron beam in a high current region is reduced to realize picture quality with high resolution.

Dependencies are inferred from the claim text.