PURPOSE: To obtain a super-highspeed type cathode structure which assures long emission life and does not result in deterioration in strength of cathode base even after a long period of use by dispersely scattering lanthanum into the cathode base in the form of LaNi5 and La2O8.
CONSTITUTION: A nickel-lanthanum alloy containing scattered lanthanum of 0.3wt% in the form of LaNi5 and a reinforced type nickel-lanthanum alloy containing scattered lanthanum of 0.1wt% and in the form of La2O3 of 0.3wt% to such nickel-lanthanum alloy are manufactured by the powder metallurgy method. Thereafter, the alloy is punched into disks in the thickness of 40μm with diameter of 1.3mm after the ordinary processings such as rolling and annealing. The obtained disk is built into the cathode structure of a color CRT as the cathode base 11 of the high speed type cathode as shown in the figure so as to manufacture a color CRT. As a result, even if the thickness of cathode base is reduced to 100μm or less, a color CRT which assures longer electron emission life and less deformation can be obtained.
OOUCHI YOSHIAKI
YAMAMOTO EIJI
KIMURA SAKAE
