IMPREGNATED NEGATIVE ELECTRODE STRUCTURE, MANUFACTURE THEREOF, ELECTRON GUN STRUCTURE, AND ELECTRON TUBE

摘要

PROBLEM TO BE SOLVED: To provide a impregnated negative electrode structure capable of conducting low temperature operation and high current density operation, of a long service life, and of a fast surface scandium concentration restoration time after an ion bombardment. SOLUTION: In a negative electrode for an electron tube provided with a negative electrode substrate in which electron emitting substrate 12 is impregnated, a negative electrode sleeve having the negative electrode substrate at an end part of it, and a heater to heat the negative electrode substrate, a thin film layer 13 including scandium and high fusion point metal, or a thin film layer 13 containing metal scandium or scandium compound formed by sputtering in a reducing atmosphere is formed on an electron emitting surface of the negative electrode substrate.