Apparatus for irradiating material by an electron beam
US4663532A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 3, 1985 |
| Grant date | May 5, 1987 |
| Priority date | — |
| Expiry date | Dec 3, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J33/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to an apparatus for irradiating material by an electron beam. The apparatus comprises guidance means for placing the material on the path of the beam, an electron gun provided in a tight enclosure having a shape with a symmetry or revolution with respect to an axis, an electron-emitting filament located in the axis of the enclosure, as well as a Wehnelt electrode surrounding the filament. It is provided with a first circular slot for concentrating electrons in the vicinity of the said slot and an electron accelerating electrode surrounding the Wehnelt electrode and having a second circular slot facing the first slot. The enclosure comprises a tightly closed circular window which is transparent to the electrons and which faces the two slots.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.