MICROPOINT TYPE COLD CATHODE

摘要

PROBLEM TO BE SOLVED: To provide a micropoint type cold cathode with improved homogeneity of the electron emission from micropoints. SOLUTION: This micropoint type cold cathode is provided with a substrate 2 containing an array of micropoints 1 and a plate 3 arranged in parallel with the substrate 2 carrying the micropoints 1. The plate 3 has holes 4 facing the micropoints 1 to constitute a grid. An insulating material 5 fills the space between the substrate 2 and the grid except for the positions of the micropoints 1. The designed distance between the apexes of the micropoints 1 and the face of the grid farthest from the substrate 2 is zero, the designed radius of curvature of the apexes of the micropoints 1 is 25 nm, and the designed radius of the holes in the grid is 1.3μm.