Thermionic emission device
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United States of America Patent
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Jul 24, 2012
Grant Date -
Jul 22, 2010
app pub date -
Jan 21, 2010
filing date -
Jan 21, 2009
priority date (Note) -
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Abstract
A thermionic emission device, in particular for use in an x-ray tube, has an indirectly heated primary emitter that is fashioned as a flat emitter with an unstructured primary emission surface, and a heating emitter that is fashioned as a flat emitter with a structured heat emission surface. The primary emitter and the heating emitter each has at least two terminal lugs, and the primary emission surface and the heat emission surface are aligned essentially parallel to one another. The emission device provides an optimally high quality of the focal spot with a simple design and, given high thermal load, an unwanted widening or defocusing of the electron beam is avoided by the terminal lugs of the primary emitter being aligned essentially perpendicular to the primary emission surface and not protruding beyond the primary emission surface in the lateral direction.
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