| 摘要 |
A CATHODE FOR AN ELECTRON TUBE IS DESCRIBED THAT HAS LITTLE DETERIORATION OF EMISSION CURRENT AFTER LONG OPERATION, IS USED AS A LONG-LIFE OXIDE CATHODE EVEN WITH HIGH CURRENT DENSITY IN A CRT, AND IS ECONOMICAL. AN EMISSIVE MATERIAL IS ADHERED ONTO A SUBSTRATE (3) THAT IS POSITIONED AT ONE OPENING OF A CYLINDRICAL SLEEVE (2) HAVING A BUILT-IN HEATER COIL (1) AND THAT INCLUDES NICKEL AS A MAIN COMPONENT BY THERMALLY DECOMPOSING CARBONATE INCLUDING AN ALKALINE EARTH METAL OXIDE (7) AND AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF TITANIUM, NICKEL, ZIRCONIUM, VANADIUM, NIOBIUM AND TANTALUM (8).(FIG.1)
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