Patent ID: 8084932
Filing Date: 2011-12-27
Classification: H01J

Abstract:
1. An electron beam apparatus, comprising: an insulating member having a concave portion on a surface thereof; a gate located on the surface of the insulating member; a cathode having a protrusion portion protruding from an edge of the concave portion toward the gate, the protrusion portion located on the surface of the insulating member so as to be opposed to the gate; and an anode arranged so as to be opposed to the protrusion portion with the gate interposed between the protrusion and the anode, wherein following conditions are satisfied: where, ε Y [Pa] is a Young's modulus of the gate, Vf [V] is voltage to be applied between the gate and the cathode, d [m] is minimum distance between the gate and the protrusion of the cathode, dav [m] is an average value of the distance between the gate and the protrusion of the cathode, a load coefficient c h [m] is film thickness of the gate, T L [m] is distance from an outer surface of the gate to an inner surface of the concave portion, and X [m] is intruding distance of the cathode into the concave portion.