Abstract:
PROBLEM TO BE SOLVED: To enable to drastically limit drift of voltage cutoff and to maintain a good maximum emission performance in a DC mode and a pulse mode. SOLUTION: With the oxide cathode for the electron gun including a substrate supporting a porous cathode emission coating (1) based on one or more alkaline earth oxides and a so-called emission area (12) and a non-emission surrounding area (11), an average density of the coating in the emission area (12) is larger than that of the same in the non-emission area (11), and an average thickness of the coating in the emission area (12) is smaller than that of the same in the non-emission area (11). COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a material of negative electrode to limit accumulation of a highly stable compound at a boundary surface between a base metal and an emission property layer in the negative electrode of a cathode-ray tube. SOLUTION: A nickel alloy, concerning the manufacturing of the negative electrode (2) of the cathode-ray tube, is made an alloy to contain magnesium and aluminum at a ratio selected so that the emission oxide layer (12) adheres well to a base metal cap (11) that is composed of this alloy.
Abstract:
PROBLEM TO BE SOLVED: To suppress evaporation in discharge and enhance resistance to ion sputtering by using electron emission material containing a first component of at least one element selected from Ba, St, and Ca, and a second component of at least one element selected from Ta, Zr, Nb, Ti, and Hf, and also containing oxynitride perovskite. SOLUTION: A desirable element of a first component is Ba, and Ba is preferable to occupy 70-100 atomic percent of the first component. A desirable element of a second component is Ta, and Ta is preferable to occupy 70-100 atomic percent of the second component. When molar ratio of the first component is represented by X and that of the second component is represented by Y, based on the total amount of the first component and the second component, the relation of 0.8
Abstract:
PROBLEM TO BE SOLVED: To provide a cathode for an electron gun capable of realizing a long service life in high current density by ensuring a diffusion path of a reducing element to be particularly included in a base metal to disperse an intermediate layer to smoothly generate a free barium atom in the cathode for the electron gun used for a cathode ray tube. SOLUTION: A cathode for an electron gun comprises a base metal 60 including nickel as major component and at least a kind of a reducing element. The cathode further comprises a upper metal layer 62 which is formed by the particle formed by recrystallization in upper surface of the base metal 60. The cathode furthermore comprises an electron emission material layer 80, formed on an upper portion of the upper metal layer 62, including alkaline earth metal oxide including at least barium.