X-ray tube
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United States of America Patent
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Dec 22, 2020
Grant Date -
Jun 13, 2019
app pub date -
Dec 20, 2018
filing date -
Jun 20, 2016
priority date (Note) -
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Abstract
According to one embodiment, an x-ray tube includes a cathode and an anode. The cathode includes a filament coil and a focusing electrode that includes a valley bottom part, a first inclined plane rising from the valley bottom part and inclined in the direction of the anode, a first focusing groove, and a first receiving groove. The anode includes a target surface. θ1>0°. The filament coil, the first receiving groove, and the first focusing groove are positioned more to a third extended line side than a first reference plane. One end part of the first receiving groove is closer to the first reference plane than the other end part.
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