Electron gun in color cathode ray tube

An electron gun in a color CRT (Cathode Ray Tube), the electron gun having a triode for emitting, controlling, and accelerating R, G, B beams, and main lens forming electrodes for focusing the R, G, B beams emitted from the triode onto a screen, the electron gun comprising:

• first dynamic quadrupole lens forming electrodes for diverging the beams in a horizontal direction and converging the beams in a vertical direction;
• second dynamic quadrupole lens forming electrodes for providing horizontal and/or vertical focusing action to be applied to the beams by applying a dynamic voltage thereto;
• third dynamic quadrupole lens forming electrodes for converging the beams in the horizontal direction and diverging the beams in the vertical direction, wherein the first dynamic quadrupole lens forming electrodes, the second dynamic quadrupole lens forming electrodes, and the third dynamic quadrupole lens forming electrodes are arranged in order starting from the main lens forming electrodes toward the triode, and wherein lens actions of a center beam pass through hole is different from lens actions of side beam pass through holes in the second dynamic quadrupole lens forming electrodes.