Patent ID: 6674228
Filing Date: 2004-01-06
Classification: H01J

Abstract:
A charged electrode in an electron gun forming an electrostatic focusing field for focusing plural electron beams on a display screen of a color cathode ray tube (CRT) in forming a video image on said screen, wherein said plural electron beams are directed along respective parallel axes, said electrode comprising:a hollow housing including first wall means for defining three inline apertures and a thin side wall forming lateral portions of said housing, wherein each of said inline apertures is aligned with a respective one of said axes for passing a respective one of said electron beams; plural second wall means disposed in said hollow housing and extending inwardly toward the electron beam axes from said side wall, wherein said plural second wall means are disposed in a spaced manner along the electron beam axes; and means defining an elongated common aperture in each of said second wall means, wherein said common apertures are aligned in a spaced manner along the electron beam axes and the electron beams are directed through said aligned common apertures, and wherein said plural wall means increase the effective radius of the electrostatic focusing field of the electrode and the length of the electrostatic focusing field along said axes for improved electron beam focusing on the display screen.