X-ray tube cathode with reduced unintended electrical field emission
US7382862B2 · kind B2 · utility
38Cited by
42References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2006 |
| Grant date | Jun 3, 2008 |
| Priority date | — |
| Expiry date | Sep 28, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2235/1216
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An x-ray source has an evacuated tube. An anode is disposed in the tube and includes a material configured to produce x-rays in response to impact of electrons. A cathode is disposed in the tube opposing the anode configured to produce electrons accelerated towards the anode in response to an electric field between the anode and the cathode. A flange extends from the cathode toward the anode, and has a smaller diameter than the evacuated tube. The flange extends closer to the anode than an interface between the cathode and the tube thus forming a reduced-field region between the evacuated tube and the flange.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.