Cold cathode
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United States of America Patent
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Jun 3, 1997
Issued Date -
N/A
app pub date -
Dec 30, 1994
filing date -
Apr 2, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a field emission device which has an emitter formed in the center portion where ion bombardment is likely to occur, and a gate formed partially thicker, or which has a metal layer with the same potential as the emitter and a high melting point, formed in the center portion of the cathode. Therefore, even bombardment of positive ions at the center portion of the cold field emission device will not affect the electron emission, thereby ensuring an always stable cathode current or electron beam. Further, as the field emission device is designed to prevent the deterioration of the insulation between the emitter and gate, abrupt stopping of the electron emission hardly occurs. Therefore, an electron tube using this field emission device has a stable function and high reliability.
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