Electron gun for cathode ray tube

An electron gun for a cathode ray tube comprising:

• a triode including a cathode, a control electrode and an accelerating electrode;
• a pre-focusing electrode unit adjacent to the triode;
• a main lens unit including a focusing electrode and an anode for forming a main lens for focusing the electron beam toward a screen;
• a first focusing electrode unit having vertically-elongated electron beam passing holes and horizontally-elongated electron beam passing holes for forming a quadrupole lens, wherein at least one electrode of the first focusing electrode unit is formed as a plate shape;
• a second focusing electrode unit having vertically-elongated electron beam passing holes and horizontally-elongated electron beam passing holes for forming a quadrupole lens, wherein at least one electrode of the second focusing electrode unit is formed as a plate shape;
• and
• an auxiliary electrode disposed between the first and second focusing electrode units, to which a dynamic voltage is applied,
• wherein horizontally-elongated electron beam passing holes are formed in an electrode of the first focusing electrode unit, to which a static voltage is applied.

An electron gun for a cathode ray tube comprising:

• a triode including a cathode, a control electrode and an accelerating electrode;
• a pre-focusing electrode unit adjacent to the triode;
• a main lens unit including a focusing electrode and an anode for forming a main lens for focusing the electron beam toward a screen;
• at least two focusing electrodes disposed between the pre-focusing electrode unit and the main lens unit for forming at least two quadrupole lenses;
• and
• an auxiliary electrode disposed between the at least two focusing electrodes and including horizontally-elongated electron beam passing holes on an electron beam incoming side thereof and vertically-elongated electron beam passing holes on an electron beam outgoing side thereof, wherein a static voltage is applied to the auxiliary electrode.