CATHODE COMPOSED OF MATERIALS WITH DIFFERENT ELECTRON WORKS FUNCTIONS
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United States of America Patent
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Issued Date -
Nov 19, 2009
app pub date -
Apr 22, 2009
filing date -
Apr 22, 2008
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Abstract
A cathode has a thermionic emitter composed of a material that emits electrons upon being heated, and an emission layer, composed of a material that has a lower electron work function than the material of the thermionic emitter, is applied on said thermionic emitter so as to at least partially cover the thermionic emitter. Such a cathode has a high electron emission with simultaneously improved focusing and a longer lifespan.
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