Rotating housing and anode/stationary cathode x-ray tube with magnetic susceptor for holding the cathode stationary
US5274690A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1992 |
| Grant date | Dec 28, 1993 |
| Priority date | — |
| Expiry date | Dec 9, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2235/162
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An x-ray tube includes an anode (A) and envelope (C) which are rotated (D) at a relatively high rate of speed. A cathode assembly (B) is supported in the envelope on a bearing (32). In order to hold the cathode assembly stationary, a magnetic susceptor (40) having periodic projections (44) is disposed with the projections closely adjacent an outer peripheral wall (20) of the envelope. A plurality of permanent magnets (52) are mounted on a stationary keeper (50), each magnet adjacent one of the susceptor projections. Preferably, the magnets have alternating polarity such that magnetic flux lines (54) flow between adjacent magnets through the magnetic susceptor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.