Electron emitter and method of producing the same

摘要

An electron emitter (10A, 10B, 10C) includes an emitter section (14) having a plate shape, a cathode electrode (16) formed on a front surface of the emitter section (14), and an anode electrode (20) formed on a back surface of the emitter section (14). A gap (50) is formed between an outer peripheral portion (42) of the cathode electrode (16) and the front surface of the emitter section (14). The front surface of the emitter section (14) contacts a lower surface (51) of the outer peripheral portion (42) to form a base end (54) as a triple junction (A). The gap (50) expands from the base end (54) toward a tip end (56) of the outer peripheral portion (42).