Cold cathode electron gun
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United States of America Patent
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-
Dec 17, 2002
Grant Date -
N/A
app pub date -
Aug 31, 1999
filing date -
Sep 1, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To stabilize an emission current of cold cathode electron gun and extend its product life. A cold cathode electron gun comprises a cold cathode for emitting electrons by field-emission, a gate electrode for controlling the field-emission, a Wehnelt electrode which surrounds the cold cathode and the gate electrode, a first anode for accelerating electrons, and a second anode for constructing an electron lens together with the first anode. An inner diameter of the first anode is greater than a radius of flow of electrons which are emitted in the direction perpendicular to the optical axis of the electron lens.
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