Image display tube having a channel plate electron multiplier
US4511822A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1981 |
| Grant date | Apr 16, 1985 |
| Priority date | — |
| Expiry date | Dec 3, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J31/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The image contrast in an image display tube having a channel plate electron multiplier (2) is improved by preventing secondary electrons emitted from the face of an input dynode (26) from straying to channels located at a relatively large distance from their origin. This is done by disposing a grid (24) at a short distance from the input dynode (26). If the grid (24) is held at a positive voltage relative to the input dynode (26), stray secondary electrons will be attracted toward the grid (24). Alternatively, if the grid (24) is held at a negative voltage relative to that of the input dynode (26), the secondary electrons will be induced to enter channels close to their origin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.