Electron-optical image tube
US4021693A · kind A · utility
Inventors
Key dates
| Filing date | Jun 9, 1975 |
| Grant date | May 3, 1977 |
| Priority date | — |
| Expiry date | Jun 9, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J40/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electron-optical image tube including a photocathode, an extraction electrode consisting of a mesh on the emission side of the photocathode, and a focussing electrode on the side of the mesh remote from the photocathode, achieves increased time resolution, improved spatial resolution, and reduced magnification at a phosphor screen by making the photocathode to mesh spacing small compared with the mesh to focussing electrode spacing. An improved photocathode plate avoids large electric fields at sharp points on the photocathode surface. Additional annular electrodes and flared deflector electrodes in the drift section of the tube prevent scattering of electrons from the tube walls on to the screen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.