The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 24, 2009
Filed:
May. 23, 2007
Joerg Freudenberger, Eckental, DE;
Sven Fritzler, Erlangen, DE;
Manfred Fuchs, Nürnberg, DE;
Matthias Maier, Nürnberg, DE;
Detlef Mattern, Erlangen, DE;
Peter Roehrer, Uttenreuth, DE;
Peter Schardt, Höchstadt A.D. Aisch, DE;
Joerg Freudenberger, Eckental, DE;
Sven Fritzler, Erlangen, DE;
Manfred Fuchs, Nürnberg, DE;
Matthias Maier, Nürnberg, DE;
Detlef Mattern, Erlangen, DE;
Peter Roehrer, Uttenreuth, DE;
Peter Schardt, Höchstadt A.D. Aisch, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
An x-ray unit has an x-ray radiator having an anode that emits x-rays upon being struck by electrons, a cathode that thermionically emits electrons upon irradiation thereof by a laser beam, electrical connections for application of a high voltage between the anode and the cathode to accelerate the emitted electrons toward the anode as an electron beam, a vacuum housing that can be rotated around an axis, an insulator that is part of the vacuum housing and that separates the cathode from the anode, a drive that rotates the vacuum housing around its axis, an arrangement for cooling components of the x-ray radiator, and an arrangement that directs the laser beam from a stationary source, arranged outside of the vacuum housing, onto a spatially stationary laser focal spot on the cathode and that focuses the laser beam. The x-ray unit furthermore has a control circuit with which an operating property of the x-ray unit is adjusted and at least one measurement element for measurement of a measurement quantity is effectively correlated with the temperature of the cathode. The control circuit adjusts the operating property dependent on the measurement of the measurement quantity.