Electron discharging apparatus

摘要

Disclosed is an electron discharging apparatus capable of fully accelerating electrons emitted from an electron discharging portion consisting of a pn-junction by effect of securing a greater exposure area of an accelerating electrode against said electron discharging portion. The inventive electron discharging apparatus comprises; a pn-junction formed on a surface side of a semiconductor substrate; an insulating film formed on the semiconductor substrate; a first aperture portion formed through a first insulating film formed on the pn-junction; and an accelerating electrode which is formed on the first insulating film by way of surrounding periphery of the first aperture portion. The accelerating electrode is formed so that inner edge portion of the accelerating electrode is projected into the first aperture portion area.