Dynamic focusing electron gun
US5404071A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 11, 1993 |
| Grant date | Apr 4, 1995 |
| Priority date | — |
| Expiry date | Mar 11, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/488
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A dynamic focusing electron gun is provided which includes a cathode and first and second grids which collectively form a triode, a plurality of electrodes for forming an auxiliary lens, and an anode installed adjacent to the final electrode of the auxiliary lens for forming a main lens. Electron beam passing holes are formed in the electrodes of the auxiliary lens so that an electron beam is repeatedly and alternately deformed in the sequence of the vertically-elongated and then horizontally-elongated (or horizontally-elongated and then vertically-elongated) shapes, constituting more than two quadrupole lenses of opposing polarities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.