PURPOSE: To ensure such a low resistance that voltage reduction in a surface electrode can be ignored and improve electron emitting efficiency by providing a pair of an electrode and a surface electrode and an insulating layer supported between these electrodes on a base, and further providing an opening part on the surface electrode.
CONSTITUTION: An electron emitting element 31 has a pair of an electrode 1 and a surface electrode 3 and an insulating layer 2 supported between these electrodes on a base 5, and the surface electrode 3 has an opening part 4. The width of the opening part 4 is less than 100μm, and the opening part is formed in plural number. Therefore, in the element 31, it is unnecessary to particularly thin the surface electrode, and the film formation in the surface electrode is facilitated. Further, as the resistance of the surface electrode can be maintained low, voltage reduction in the surface electrode can be ignored, allowing the addition of an effective electric filed to the element and the prevention of failure by exothermic. The electrons leading through the insulating layer 2 to the exposed part of the layer 2 are emitted without loosing energy.
YANAGISAWA YOSHIHARU
MORIKAWA YUUKO
