Patent ID: 7112920
Filing Date: 2006-09-26
Classification: H01J

Abstract:
1. A field emission electron source, comprising: a plurality of emitters formed on a surface of a substrate; an insulation layer formed on the substrate, the insulation layer including an opening formed therein so that the plurality of emitters are disposed in the opening; and an extraction electrode formed on the insulation layer, the extraction electrode including an opening formed therein so that the plurality of emitters are disposed in the opening, wherein when the field emission electron source is viewed along a direction normal to the surface of the substrate, a shape of a periphery of the opening of the extraction electrode comprises at least two adjacent arcs that are concentric with at least two adjacent emitters, respectively, among the plurality of emitters, wherein a radius of each of the at least two arcs is larger than a half of a distance between centers of the at least two emitters.