Patent ID: 7884533
Filing Date: 2011-02-08
Classification: H01J

Abstract:
1. An electron-emitting device comprising: an insulating member; a cathode disposed on a surface of the insulating member; and a gate disposed on the surface of the insulating member so as to be opposite to an edge of the cathode, wherein the insulating member has a recess on the surface where the edge of the cathode is positioned, the edge of the cathode has a protruding portion protruding from an edge of the recess on the surface of the insulating member toward the gate, and a length of the protruding portion in a direction along the edge of the recess is shorter than a length of a portion of the gate opposite to the protruding portion in the direction along the edge of the recess wherein the gate has a humped portion on a portion opposite to the protruding portion of the cathode, and a length of the portion of the humped portion opposite to the protruding portion in the direction along the edge of the recess is equal to or shorter than the length of the protruding portion.