ELECTRON EMISSION ELEMENT AND ITS MANUFACTURE

摘要

PURPOSE:To provide an electron emission element which does not need especially high manufacture art as a cone type, and which hardly causes the short- circuiting by the breakage of each element completed and further which has electric property more excellent than that in the case of an edge type and equality and stability in electron emission. CONSTITUTION:This has an emitter 1, which is made by arranging a plurality of protrusions 11a made in rectangular shape in radially of centripetally, and a gate 2, which is provided near the emitter 1 so as to apply an electric field to the emitter 1. Two corners 10a whose heads are sharply pointed three- dimensionally are formed at the head of each protrusion 11 of the emitter 1. When an electric field is applied between the gate 2 and the emitter 1, electrons are emitted concentrically from each corner 10a.