X-ray tube system
US4823371A · kind A · utility
22Cited by
6References
16Claims
0Family size
Inventor
Key dates
| Filing date | Aug 24, 1987 |
| Grant date | Apr 18, 1989 |
| Priority date | — |
| Expiry date | Aug 24, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2235/068
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An x-ray tube contains a plurality of filaments each with an associated focus cup control to allow it to change rapidly between discrete emission intensities. The cathode structure of the x-ray tube is constructed so that each filament is located in a separate focus cup structure. However, the focus cup structures are electrically isolated so that a separate bias potential can be applied to each focus cup structure. By separately biasing each focus cup structure, the emission from each of the filaments can be controlled independently.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.