Compact field emission electron gun and focus lens
US6255768A · kind A · utility
3Cited by
23References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1999 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Jul 19, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2201/30457
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A source of a focused electron beam is provided for use in a cathode ray tube (CRT) or vacuum microelectronic device. A carbon-based field emission cathode, extraction gate and focus lens are formed as an integrated structure using fabrication techniques that are used to form integrated circuits. An external focus lens is used to confine the beamlets from a large number of carbon-based surfaces. A convergence cup accelerates the beam toward a drift space and finally to a screen on a CRT or other device. The source may be much more compact than present CRT electron optics apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.