Abstract
The distributions of the electron current emitted from NEA cold cathodes were measured by dissecting the electron optical image with a 5 µm diameter pin-hole attached to a metallic target in an experimental tube similar to a 1-inch-vidicon. Then the distributions of emission current density were displayed threedimensionally on an oscilloscope. The NEA cold cathode was constructed by shallow diffusion of Zn into the n-GaAsP substrate followed by deposition of a ring-shaped contact electrode on the diffused layer. It was found that the current distributions emitted from an NEA cold cathode nearly agree with Kohn's theory. A Gap cold cathode designed to reduce current crowding was also examined and it was demonstrated that the emission current could be concentrated at the center of the cathode at a moderately large diode current.
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