Low aberration, high intensity electron beam for X-ray tubes
US9711321B2 · kind B2 · utility
3Cited by
5References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 30, 2014 |
| Grant date | Jul 18, 2017 |
| Priority date | — |
| Expiry date | Jun 8, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2235/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In the present invention, a cathode for an x-ray tube is formed with a large area flat emitter. To reduce aberrations to a minimum the emission area in the flat emitter has a non-rectangular shape and focusing pads arranged around the emitter. In an exemplary embodiment, the flat emitter has a non-rectangular polygonal shape for an emission area on the emitter in order to increase the emission current from the emitter at standard voltage levels without the need to run the emitters at a higher temperature, add additional emitters to the cathode and/or to coat the emitters with a low work function material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.