Impregnation type cathode for a cathodic ray tube
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United States of America Patent
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May 5, 1998
Issued Date -
N/A
app pub date -
Mar 17, 1997
filing date -
Oct 5, 1993
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Expired
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Abstract
An impregnation type cathode for a cathode ray tube includes a porous cathode piece having electron emission material impregnated therein. The porous cathode piece has a layer of W--Sc (or a layer of W--Sc.sub.2 O.sub.3) on its surface and a layer of alloy formed of at least two elements of a group of elements consisting of Ir, Os, Ru, and Re on the layer of W--Sc (or the layer of W--SC.sub.2 O.sub.3)
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