X-ray tube with flying focus
AssigneeSiemens Aktiengesellschaft
InventorsErich Hell, Detlef Mattern, Peter Schardt
Life of this patent
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Abstract
X-ray tube with flying focus has a magnet system for deflecting and focusing the electron beam, whereby the magnet system including a carrier that is constructed as an iron yoke and that has four pole projections that are arranged around the axis of the electron beam offset from one another by 90°, on which two pairs of coils (z-coils and φ-coils) are arranged so as to be offset from one another 90°. The individual coils of each pair supplied with a common high-frequency alternating current that deflects the electron beam in the φ-and z-directions, respectively, in a pulsed manner.
Claims7
An X-ray tube comprising:
- a vacuum housing;
- a cathode and an anode disposed in said vacuum housing, said cathode emitting electrons which strike said anode to produce X-rays;
- a magnet system disposed between said cathode and said anode through which said electrons pass for deflecting and focusing said electrons to produce a flying focal spot on said anode;
- and
- said magnet system comprising a yoke through which said electrons pass having four pole projections which are angularly offset relative to each other and which are arranged in pairs, with two pole projections in each pair being disposed opposite each other, four coils wound around said yoke and being respectively disposed between neighboring pole projections, said coils comprising a first pair and a second pair with the coils in each of said first and second pairs being disposed opposite each other, said first pair of coils being supplied with a first common current and said second pair of coils being supplied with a second common current so that said electrons are deflected by said first pair of coils in a first direction, and said electrons are deflected by said second pair of coils in a second direction which is different from said first direction.
Dependencies are inferred from the claim text.