Focal spot motion control for rotating housing and anode/station

Details Focal spot motion control for rotating housing and anode/station Focal spot motion control for rotating housing and anode/station

1994-11-28

1996-12-03

Porta, David P.

X-ray or gamma ray systems or devices

Source

Electron tube

378137, H01J 3504

Patent

active

055815910

ABSTRACT:
An x-ray tube includes an anode (A) and an envelope (C). A cathode assembly (B) which is supported in the envelope on a bearing (32) emits a beam of electrons which strike the anode forming a focal spot. The anode rotates (D) relative to the cathode such that focal spot follows a generally annular path along a beveled track (14). If the axis of the anode and the cathode assembly are screwed or offset, the focal spot path is not circular and wobbles. An adjustment assembly (60) adjusts the relative positions of the anode, the cathode and the envelope to adjust the anode and cathode assembly axes. The adjustment assembly also includes one or more electrodes (102, 108) which adjust the position of the focal spot. An angular position encoder (106) identifies an angular orientation of the anode. A control circuit (110) applies an electrostatic potential to the electrodes to move the focal spot such that it stays on a constant plane of the leveled anode surface.

REFERENCES:
patent: 2926270 (1960-02-01), Zunick
patent: 3689790 (1972-09-01), Haas et al.
patent: 3714487 (1973-01-01), Jacob
patent: 4675891 (1987-06-01), Plessis et al.
patent: 4878235 (1989-10-01), Anderson
patent: 4993055 (1991-02-01), Rand et al.
patent: 5065420 (1991-11-01), Levere

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