| 摘要 |
An electron emitter 10 A has an emitter 12 made of a dielectric material and an upper electrode 14 and a lower electrode 16 for being supplied with a drive voltage Va for emitting electrons. The upper electrode 14 is disposed on an upper surface of the emitter, and the lower electrode 16 is disposed on a lower surface of the emitter 12. The upper electrode 14 has a plurality of through regions 20 through which the emitter 12 is exposed. Each of the through regions 20 of the upper electrode 14 has a peripheral portion 26 having a surface facing the emitter 12 and spaced from the emitter 12.
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