Structure of electron gun for cathode ray tube

A cathode ray tube comprising:

• a panel having a fluorescent screen formed on an inner surface;
• a funnel connected to the panel;
• an electron gun for emitting electron beams;
• a deflection yoke for deflecting the electron beams in horizontal and vertical directions;
• and
• a shadow mask with a color selecting function,
• wherein the electron gun comprises a triode unit for generating electron beams, pre-focus lenses for preliminary focusing and accelerating the electron beams generated by the triode unit, and a main lens for finally focusing and accelerating the focused and accelerated electron beams through the pre-focus lenses,
• wherein a control electrode forming the triode unit has horizontally elongated electron beam passing holes, and an accelerating electrode forming the triode unit has vertically elongated electron beam passing holes or vertically elongated slots that are formed around the electron beam passing holes,
• wherein a vertical size of the electron beam passing hole on the control electrode is 40–70% of a horizontal size of the electron beam passing hole on the control electrode,
• wherein a horizontal size of the electron beam passing hole on the accelerating electrode is 80–90% of a vertical size of the electron beam passing hole on the accelerating electrode, and wherein a horizontal direction crossover of the electron beam is formed between the accelerating electrode and a first pre-focus electrode, or after the first pre-focus electrode, and a vertical direction crossover of the electron beam is formed between the control electrode and the accelerating electrode.