Cathode selection method
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United States of America Patent
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Mar 3, 2015
Grant Date -
May 1, 2014
app pub date -
Oct 28, 2013
filing date -
Oct 30, 2012
priority date (Note) -
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Abstract
A cathode selection method includes measuring, by using a cathode having an electron emission surface which is a flat surface and a emission area which is limited, a total emission emitted from the cathode; calculating, using a measured total emission value, work function by a Richardson Dash Man's formula; and determining whether or not the cathode has the work function equal to or under an acceptable value.
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