Photomultiplier tube having reduced tube length
US5189338A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 1992 |
| Grant date | Feb 23, 1993 |
| Priority date | — |
| Expiry date | Jan 9, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J43/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A photomultiplier tube includes a tube, a focussing electrode unit formed with a photoelectron transmission hole whose center is positioned offset from a central axis of the tube and a dynode positioned in confrontation with the transmission hole. A center of the dynode is also offset from the central axis of the tube. A grid type electrodes array are positioned at the same axial position of the dynode and positioned beside the dynode in a radial direction of the tube. The focussing electrode provides desirable uniformity in distribution of photoelectronics over the dynode even by the deviating position of the photoelectron transmission hole and the dynode. By positioning the dynode away from the central axis in the radial direction of the tube, the grid type electrode array can be positioned beside the dynode. Thus, entire length of the tube can be reduced without any change in a diameter of the tube because of the fact that a length of the dynode in the axial direction of the tube only influences the axial length of the tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.