Electron source
US5760548A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 1996 |
| Grant date | Jun 2, 1998 |
| Priority date | — |
| Expiry date | Jul 3, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2329/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electron source comprises cathode means and a permanent magnet. A plurality of channels disposed in the magnet in a two dimensional array of rows and columns and extending between opposite poles of the magnet. The magnet generates, in each channel, a magnetic field which forms electrons received from the cathode means into an electron beam for guidance towards a target. Grid electrode means are disposed between the cathode means and the magnet for controlling flow of electrons from the cathode means into each channel. The grid electrode means comprises a plurality of parallel row conductors and a plurality of parallel column conductors arranged orthogonally to the row conductors. Each channel is located at a different intersection of a row conductor and a column conductor. Electric field isolation means reduces leakage of electric fields from each intersection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.