Thermionic emission device, focus head, x-ray tube and x-ray radiator
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United States of America Patent
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Aug 7, 2018
Grant Date -
Feb 22, 2018
app pub date -
Aug 17, 2017
filing date -
Aug 17, 2016
priority date (Note) -
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Abstract
A thermionic emission device includes an indirectly heatable main emitter, which is constructed as a flat emitter with a main emission surface, and at least one connectible heat emitter with a heat emission surface. The heat emission surface is disposed at a predefinable distance from the main emission surface. The main emission surface can be asymmetrically heated by the heat emission surface. In the operating state, the main emitter is at a main potential and the heat emitter is at a heating potential which differs from the main potential. An x-ray tube with the thermionic emission device has a longer service life with a consistent image quality.
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