Patent ID: 6703776
Filing Date: 2004-03-09
Classification: H01J

Abstract:
A cathode ray tube, comprising:an electron source including a cathode for an emission of electrons; an electron beam guidance cavity including an input aperture and an output aperture for concentrating electrons emitted from said cathode; a first electrode for applying a first electric field between said output aperture and said cathode to allow electron transport through said electron beam guidance cavity; an accelerating grid for accelerating the electrons leaving said electron beam guidance cavity; a first electron lens having an entrance for focusing the accelerated electrons onto a display screen; wherein said first electrode and said accelerating grid collectively constitute a second electron lens between said electron beam guidance cavity and said first electron lens, said second electron lens for adapting a diameter of the accelerated electrons to a diameter of said entrance of said first electron lens; and wherein said first electrode includes a first part and a second part placed along an axis of said first electron lens.