Patent ID: 6600257
Filing Date: 2003-07-29
Classification: H01J

Abstract:
A cathode ray tube provided with at least one oxide cathode comprising a cathode carrier with a cathode base of a cathode metal and a cathode coating of an electron-emitting material with oxide particles, said oxide particles containing an alkaline earth oxide, selected from the group formed by the oxides of calcium, strontium and barium, doped with an oxide doping in a quantity ranging from 120 to maximally 500 ppm of an oxide selected from the oxides of scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium, and the electron-emitting material has an electric conductance of 3*10âˆ’3 &OHgr;âˆ’1 cmâˆ’1 to 12.5*10âˆ’3 &OHgr;âˆ’1 cmâˆ’1.