Patent ID: 6856081
Filing Date: 2005-02-15
Classification: H01J

Abstract:
1. An electron beam device having a longitudinal axis, comprising: a source of a plurality of electron beams disposed apart from the longitudinal axis, the plurality of electron beams arranged to form between said source and a collector assembly; a flux equalization assembly disposed between said source and said collector assembly and relatively near said source, said flux equalization assembly including: (1) a flux plate formed of a ferromagnetic material, the flux plate including at least one aperture for each of the plurality of electron beams, an aperture wall defining the aperture and (2) a flux equalization ring disposed concentrically about each of the plurality of electron beams and forming an azimuthally varying gap between said flux ring and a corresponding aperture wall; and a source of a magnetic field disposed to focus the electron beams, wherein the electron beams travel between the source and the collector in a substantially straight path parallel to the longitudinal axis of the device.