Cathode ray tube comprising a doped oxide cathode
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United States of America Patent
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Jul 29, 2003
Grant Date -
Jun 13, 2002
app pub date -
Sep 13, 2001
filing date -
Sep 14, 2000
priority date (Note) -
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Abstract
A cathode ray tube is provided with at least one oxide cathode including a cathode carrier with a cathode base of a cathode metal and a cathode coating of an electron-emitting material with oxide particles. The oxide particles contain 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. The electron-emitting material has an electric conductance of 3*10.sup.-3 .OMEGA..sup.-1 cm.sup.-1 to 12.5*10.sup.-3 .OMEGA..sup.-1 cm.sup.-1.
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