Patent ID: 6611103
Filing Date: 2003-08-26
Classification: H01J

Abstract:
An electron gun assembly for a cathode ray tube comprising:at least one cathode electrode which emits electrons; a control electrode which controls traveling directions of the electrons emitted from said cathode electrode, thereby producing three streams of the electrons; an electron-stream extractor electrode which accelerates said three streams of the electrons; a focusing electrode which focuses said three streams of the electrons accelerated by said electron-stream extractor electrode; and an anode electrode which accelerates said three streams of the electrons focused by said focusing electrode; wherein said electron-stream extractor electrode includes first, second, and third holes, each of which allows one of said three streams of the electrons produced by said control electrode to pass through; wherein said focusing electrode includes a surface which faces said electron-stream extractor electrode, said surface including fourth, fifth, and sixth holes, each of which allows one of said three streams of the electrons accelerated by said electron-stream extractor electrode to pass through, said fourth, fifth, and sixth holes facing said first, second, and third holes, respectively; wherein at least one of said fourth, fifth, and sixth holes of said focusing electrode includes a substantially rectangular opening and a substantially semicircular opening, one side of said substantially rectangular opening being connected to a straight line segment of said substantially semicircular opening.