Patent ID: 7307378
Filing Date: 2007-12-11
Classification: H01J

Abstract:
1. An in-line type electron gun comprising: an electron beam generating portion for generating three electron beams arranged in a line and comprising a center beam and a pair of side beams that travel on a same horizontal plane; and a main lens for accelerating and focusing the three electron beams, wherein the main lens is formed by disposing at least two electrodes facing one another, wherein a portion in which the at least two electrodes are facing to one another comprise a pair of tubular electrodes having an opening through which the center beam and the pair of side beams pass, wherein the opening has a shape of a horizontally elongated aperture having a major dimension in a horizontal direction and a minor dimension in a vertical direction, and wherein a relationship 0.5<B/A<1.0 is satisfied, where A represents a minor dimension of the opening in the tubular electrode to which a relatively low voltage is applied, and B represents a minor dimension of the opening in the tubular electrode to which a relatively high voltage is applied.