In a field emission electron gun including emitters (104) on predetermined parts of a substrate (109), an insulator film (105) on a remaining part of the substrate, a first gate electrode (101) on the insulator film so as to surround the emitters with a space left between each emitter and the first gate...http://www.google.com.tw/patents/US5977696?utm_source=gb-gplus-share專利 US5977696 - Field emission electron gun capable of minimizing nonuniform influence of surrounding electric potential condition on electrons emitted from emitters
