发明申请
US20090167138A1 Thermionic electron source 有权
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Thermionic electron source
摘要:
A thermionic electron source includes a substrate, two electrodes, and a thermionic emitter. The thermionic emitter is electrically connected to the two electrodes. The substrate has a recess formed on a surface thereof, and the thermionic emitter is located on the surface of the substrate corresponding to the recess.
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