Patent ID: 7528539
Filing Date: 2009-05-05
Classification: B82Y,H01J

Abstract:
1. An electron emitter comprising: an emitter layer formed of a dielectric material; a first electrode provided on or above a first surface of the emitter layer and having an opening portion with an opening formed therein; and a second electrode provided on or below a second surface of the emitter layer opposite the first surface; the emitter layer emitting electrons through the opening when a drive voltage is applied between the first electrode and the second electrode, wherein the first electrode is configured and disposed such that a first portion of a surface of the opening portion facing the first surface of the emitter layer is apart from the first surface and a second portion of said surface of the opening portion of the first electrode is in contact with a portion of the first surface of the emitter layer, wherein the opening portion has an inner edge surrounding the opening, and has a shape which causes lines of electric force to concentrate at the inner edge.