Electron emitter

摘要

An electron emitter (10A) has an emitter (12) made of a dielectric material, and an upper electrode (14) and a lower electrode (16) to which a drive voltage (Va) is applied to emit electrons. The upper electrode (14) is formed on a first surface of the emitter (12), and the lower electrode (16) is formed on a second surface of the emitter (12). The upper electrode (14) has a plurality of through regions (20) through which the emitter (12) is exposed. The upper electrode (14) has a surface which faces the emitter (12) in peripheral portions (26) of the through regions (20) and which is spaced from the emitter (12).