Electron field emission device
US5243252A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1990 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | Dec 19, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/025
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electron emission device is employed as an electron emission source in various applications using an electron beam. The electron emission device has a cathode layer having an edge, and a control electrode spaced and electrically insulated from the cathode layer, for drawing electrons from said edge of the cathode layer. When a voltage is applied between the cathode layer and the control electrode, a developed electric field is concentrated on the edge of the cathode layer to cause the edge to emit electrons. The electron emission device can easily be manufactured with a high yield since it does not have a needle tip for emitting electrons. A method of manufacturing the electron emission device is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.