X-Ray tube grid bias supply
US4334153A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1980 |
| Grant date | Jun 8, 1982 |
| Priority date | — |
| Expiry date | Sep 29, 2000 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/548
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An adjustable focus x-ray tube has its cathode connected to the negative side of a dc power supply which is below ground by half of the total voltage applied to the tube and its anode connected to the positive side of the supply which is above ground by half of the applied voltage. A voltage divider is connected between the negative side or cathode and ground and an intermediate point on the divider is connected to a focusing electrode in the x-ray tube for providing a focusing bias voltage. Since the bias voltage is derived from the cathode-to-ground voltage it will always track or remain proportional to the cathode voltage so the effect of variations in the latter on focusing will be negated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.