Patent ID: 6441390
Filing Date: 2002-08-27
Classification: H01J

Abstract:
An electron discharging apparatus comprising;a pn-junction formed on a surface side of a semiconductor substrate; an insulating film, having a first insulating film and a second insulating film formed in said first insulating film, formed on said semiconductor substrate, and a third insulating film; an aperture portion, having a first aperture portion formed through said insulating film, and a second aperture portion, together formed on said pn-junction, said first aperture portion and said second aperture portions constituting an electron discharging portion from each; and an accelerating electrode formed between said second insulating film of said insulating film and said third insulating film so as to surround a periphery of said first aperture portion and projecting toward a center of said aperture portion; wherein said accelerating electrode is formed so as to project its inner edge portion into said first aperture portion, overhanging in the first aperture portion so that the edge portion and a bottom surface of the accelerating electrode project themselves toward said first aperture portion, and a top surface thereof projects itself toward said second aperture portion.