Electron gun for color cathode ray tube

An electron gun for a color cathode-ray tube, comprising:

• a triode unit emitting an electron beam, said triode unit including a cathode, a control electrode, and a screen electrode;
• first and second auxiliary focusing electrodes sequentially installed coaxially with said triode unit, for forming auxiliary lenses;
• first and second focusing electrodes installed coaxially with said first and second electrodes, for forming a quadrupole lens, protruding portions having flat surfaces corresponding to opposite surfaces of said first and second focusing electrodes are formed on at least one of the opposite surfaces of said first and second focusing electro des to change the profile of the electron beam by applying a dynamic focus voltage to the edge of electron beam passing holes formed in the opposite surfaces;
• and
• a final acceleration electrode installed adjacent to said second focusing electrode, for forming a main lens.

An electron gun for a color cathode-ray tube, comprising:

• a triode unit emitting an electron beam, said triode unit including a cathode, a control electrode, and a screen electrode;
• first and second focusing electrodes installed coaxially with said triode unit, for forming a quadrupole lens;
• and
• protruding portions including flat surfaces inclined at a predetermined angle with respect to opposite surfaces of said first and second focusing electrodes, for changing the profile of the electron beam when a dynamic focus voltage is applied to the edge of electron beam passing holes formed in each of the opposite surfaces of said first and second focusing electrodes.