Patent ID: 7759851
Filing Date: 2010-07-20
Classification: H01J

Abstract:
1. A triode type cathode structure comprising, in superposition: an electrode forming a cathode; an electrical insulation layer and a grid electrode; a slit formed in the grid electrode and in the electrical insulation layer up to the electrode forming a cathode, the slit having a longitudinal axis and a length dimension greater than a width dimension, the slit having a bottom and walls; and the slit containing a plurality of separate emissive elements made of an electron emitting material, each of the emissive elements being in the form of a layer, the plurality of separate emissive elements being located on the electrode forming a cathode, in the central part of the slit such that the plurality of emissive elements do not contact the walls of the slit, and the plurality of emissive elements being aligned along the longitudinal axis of the slit.