Patent ID: 6707061
Filing Date: 2004-03-16
Classification: B82Y,H01J

Abstract:
A field emission-type electron source comprising a substrate, an electroconductive layer formed on a surface of said substrate, a semiconductor layer formed on said electroconductive layer, a strong field drift layer having a drift portion that is made of an oxidized or nitrided porous semiconductor layer and that is formed on the side of the surface of said semiconductor layer, and a surface electrode formed on said strong field drift layer, wherein when voltage is applied to cause said surface electrode to be anodic with respect to said electroconductive layer, electrons injected from said electroconductive layer to said strong field drift layer drift through said strong field drift layer, and are emitted through said surface electrode; whereina current restraining member for restraining a current which does not contribute for emission of a current flowing through said drift portion, is provided in at least one of said electroconductive layer, said surface electrode, a portion between said electroconductive layer and said drift portion, and a portion between said surface electrode and said drift portion.