Field emission type electron gun
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United States of America Patent
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Jun 24, 1986
Grant Date -
N/A
app pub date -
Feb 14, 1984
filing date -
Jun 17, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A field emission type electron gun comprises a cathode, a plurality of anodes opposing in series to the cathode and a filament for heating the anodes, all being contained in a vacuum tube. The filament is placed immediately before a first anode directly opposing the cathode in a symmetrical manner so as to serve both as a gas expelling member and as an anode.
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