Patent ID: 9673592
Date: 2017-06-06
CPC Classifications: H01J,H01T,H05G

Claim:
1. An x-ray tube comprising: a vacuum housing; an anode positioned within the vacuum housing; a cathode comprising a deflection electrode and a focus head positioned within the vacuum housing; an insulation element positioned adjacent to the focus head of the cathode such that the insulation element is positioned between the focus head and the deflection electrode of the cathode; and a voltage arrester device that comprises an insulation path, the voltage arrester device comprising at least one first protective electrode and at least one second protective electrode, wherein the at least one first protective electrode is disposed on the focus head of the cathode and the at least one second protective electrode is disposed on the deflection electrode of the cathode; wherein, upon application of a high voltage, the cathode is configured to emit electrons that are configured to strike the anode as an electron beam; wherein the insulation path of the voltage arrester device has a field strength that is higher than a field strength at the insulation element; and wherein the voltage arrester device is configured to discharge voltage when a voltage flashover occurs.