Electron-emitting devices having variously constituted electron-emissive elements, including cones or pedestals
US5559389A · kind A · utility
117Cited by
22References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1993 |
| Grant date | Sep 24, 1996 |
| Priority date | — |
| Expiry date | Nov 24, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2201/319
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A gated electron-emitting device contains a multiplicity of electron-emissive elements, each formed with a pedestal (98) and an overlying cone (94.sub.1). In each electron-emissive element, the base diameter of the cone is greater than the element, the base diameter of the cone is greater than the diameter of the pedestal. With the pedestal being electrically conductive, the cone may be electrically resistive. Alternatively, each electron-emissive element can be an elongated element (30B) that reaches a maximum diameter at a point between, and spaced apart from, both ends of the element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.