Abstract: A dispenser cathode comprises an electron emissive material including at least one selected from the group consisting of Ba and Ba oxide, a porous metal base body having a plurality of diffusing cavities and positioned on the electron emissive material and an alloy thin film layer consisting of scandium tungstate and tungsten which is disposed between the electron emissive material and the porous metal base body. Instead of the alloy thin film, a pellet containing scandium tungstate may be interposed between said electron emissive material and the porous metal base body. The activation aging time of the dispenser cathode of the present invention is greatly shortened as compared with the conventional dispenser cathode, and the damage of Sc by ion bombardment is prevented, and thus the stable thermoelectron emission can be obtained.

Abstract: A dispenser cathode comprises an electron emissive materials, a porous base body containing tungsten, a reservoir storing the porous base body, and a sleeve storing the heater therein. The porous base body contains TiO.sub.2 or ZrO.sub.2. The dispenser cathode achieves high luminance and high definiteness required by a large-sized display and the time for manufacturing the cathode is reduced.

Abstract: This invention relates to an oxide-coated cathode for CRT and a manufacturing method thereof, where Scandium (Sc) or Scandium Oxide (Sc.sub.2 O.sub.3) is vaporized and ionized into a gas state under the oxygen existing environment, and is accelerated onto the surface of a base of Ni containing small amounts of a reducing element such as Mg or Si to form an implantation layer in a certain depth within the base, thereby enhancing the electron emissive characteristics and lengthening the longevity of the cathode.

Abstract: A dispenser cathode comprises an electron emissive material containing BaAl.sub.4 and Ni, the porous metal base body and a sleeve. The activation aging time of the dispenser cathode according to the present invention is shortened greatly as compared with the conventional dispenser cathode and therefore, the productivity can be increased.

Abstract: A cavity reservoir type dispenser cathode includes a first pellet, a second pellet, a cup and a sleeve, the first pellet being made by sintering a mixture of at least one metal selected from among W, Mo, Ta and alloys thereof, at least one metal selected from among Os, Ir, Ru, Re and alloys thereof, and Sc.sub.2 O.sub.3, the second pellet being made of a mixture of barium-calcium aluminate and In.sub.2 O.sub.3, the first and second pellets being inserted into a cup and the cup being inserted into and welded to a sleeve. The cavity reservoir type dispenser cathode of the present invention has a high saturation current density at lowered temperatures to prevent deformations and shortening of life expectancy of nearby components due to a high operating temperature.