Cathode structure including barrier for preventing metal bridging from heater to emitter
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United States of America Patent
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Aug 19, 2008
Grant Date -
Oct 21, 2004
app pub date -
Jan 12, 2004
filing date -
Jan 17, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A cathode structure comprises a heater including a columnar ceramic body and a heating wire that is partially buried in the ceramic body, and a cathode unit disposed at a first end surface of the ceramic body. The heating wire leads out from a second end surface of the ceramic body.
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