Patent ID: 6489737
Filing Date: 2002-12-03
Classification: H01J

Abstract:
A cathode ray tube apparatus comprising: an electron gun structure having an electron beam formation portion for generating at least one electron beam and a main lens portion for focusing said electron beam generated from said electron beam formation portion onto a phosphor screen; and a deflecting yoke for generating a deflection magnetic field for deflecting said electron beam emitted from said electron gun structure in the horizontal direction and the vertical direction,wherein said main lens portion is constituted by including at least one focus electrode to which a focus voltage on a first level is applied, at least one anode electrode to which an anode voltage on a second level higher than said first level is applied, and at least two auxiliary electrodes to which a voltage whose level is higher than said first level and lower than said second level is applied, and wherein an electrode length of each of said at least two auxiliary electrodes along a traveling direction of said electron beam differs in accordance with a difference in potential between electrodes arranged at front and rear positions in said electron beam traveling direction of each electrode.