Electron gun
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United States of America Patent
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N/A
Issued Date -
May 4, 2006
app pub date -
Oct 18, 2005
filing date -
Oct 28, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A disk-shaped cathode pellet is installed and secured by a retainer onto a heater cap that incorporates a heater. The part of this retainer that covers the periphery of the electron emission surface of the cathode pellet functions as a portion of a Wehnelt electrode. Alternatively, the retainer is formed such that the average angle of the surface with respect to the outermost shell of the electron beam matches the Pierce angle such that the part of this retainer that covers the periphery of the electron emission surface of the cathode pellet functions as a Wehnelt electrode.
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