What is
Cathode, Electron-Tube,
Indirectly Heated (
)
The present invention relates to the
manufacturing method of an indirectly heated cathode comprising
the formation of a black film on the internal surface of a
cathode sleeve, which contains a reducing material, the black
film being formed by heat reduction of a thin film of a metal
oxide, which has previously been formed on the internal surface
of the cathode sleeve. The indirectly heated cathode
manufactured by this method has shorter emission warm up time
for the emission of electrons and lower power consumption
compared with those manufactured by conventional methods.
