Patent ID: 6819038
Filing Date: 2004-11-16
Classification: H01J

Abstract:
An electron gun for a cathode ray tube, the electron gun comprising:a triode portion including at least one cathode adapted to emit electron beams in a first direction toward a screen of the cathode ray tube, and including a control electrode and a screen electrode adapted to control the electron beams; a plurality of electrodes including first, second, third, fourth, and fifth focus electrodes and a final acceleration electrode sequentially arranged in the first direction from the screen electrode to the screen of the cathode ray tube and adapted to form a plurality of electron lenses; forming at least one auxiliary quadruple lens between the second and third focus electrodes, forming at least one first quadruple lens between the third and fourth focus electrodes, forming at least one second quadruple lens between the fourth and fifth focus electrodes, and forming at least one main lens between the fifth focus electrode and the final acceleration electrode in response to a screen voltage being applied to the screen electrode and the second focus electrode, a static focus voltage being applied to the first and fourth focus electrodes, a parabola type dynamic focus voltage synchronized with a deflection signal being applied to the third and fifth focus electrodes, and an anode voltage being applied to the final acceleration electrode; the plurality of electrodes interacting with the electron beams emitted from the at least one cathode to form a parallel row of electron beams, the parallel row of electron beams extending in a second direction perpendicular to the first direction; the third focus electrode having an input side adapted to receive the electron beams and having an output side adapted to output the electron beams; and the input side of the third focus electrode having holes arranged therein, the holes being elongated in a third direction perpendicular to the second direction.