▎ 摘　　要

NOVELTY - The structure has a support body (7) positioned on a cathode substrate (1). An anode (8) is positioned on the support body and arranged parallel to the anode substrate. An insulation medium layer (4) is provided with a dielectric film hole and arranged on the cathode substrate. A negative electrode (2) is arranged on the cathode substrate and positioned on the dielectric film hole. An electronic beam (9) is emitted by a field emission emitter body (3) that passes via a graphene (6) via an electric field effect of a grid electrode (5) and bombs the anode under a cathode electric field effect. USE - Field emission triode structure for use in a cold cathode X-ray source, a micro wave amplifying tube and a field emitting displayer. ADVANTAGE - The structure can uniformly accelerate and focus an emission of field emitting current and the electronic beam in an effective manner. DETAILED DESCRIPTION - The field emission emitter body (3) is a metal micro tip, a silicon tip or a carbon nano tube and made of nano zinc oxide. DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a field emission triode structure. Cathode substrate (1) Negative electrode (2) Field emission emitter body (3) Insulation medium layer (4) Grid electrode (5) Graphene (6) Support body (7) Anode (8) Electronic beam (9)