Linear beam microwave tube with planar cold cathode electrode as electron beam source
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United States of America Patent
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Aug 18, 1998
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N/A
app pub date -
Oct 30, 1996
filing date -
Oct 31, 1995
priority date (Note) -
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Abstract
An electron gun using a plane type cold cathode electrode has a beam focusing electrode which is disposed in front of the plane type cold cathode electrode and has a hole having a diameter smaller than an electron emission region. The beam focusing electrode is in direct contact with a cathode chip constituting the plane type cold cathode electrode, thus realizing direct electrical connection between the cold cathode chip and the beam focusing electrode. The arrangement enables the converging of an electron beam from the cold cathode electrode to a desired shape and the accurate setting of the center of a beam orbit to a desired position.
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