| 摘要 |
PURPOSE: An electron gun for a color CRT(Cathode Ray Tube) is provided to regulate astigmatism through a main lens by applying a fine dynamic focusing electrode to three electron beams and to compensate an asymmetric fine Halo on a screen. CONSTITUTION: An oval electron beam hole(21a) is formed on a constant voltage focusing electrode(21) to make three electron beams pass. Two and more guide inner electrodes(23,24) are formed in the focusing electrode(21) wherein outer electron beam holes(23a,23c,24a,24c) are arranged asymmetrically like a polygon. Plural circular electron beam holes(22a) are formed on a variable voltage focusing electrode(22). A compensation electrode(25) is fixed on the circular hole(22a) to insert a horizontal planar electrode(25a) into the oval electron beam hole(21a). A fine halo is compensated through the asymmetric structure of the electron beam holes and the same voltage is fed to each point of the three electron beams.
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