CRT with field-emission cathode
US4178531A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 15, 1977 |
| Grant date | Dec 11, 1979 |
| Priority date | — |
| Expiry date | Jun 15, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/505
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cathode-ray tube comprises an evacuated envelope having therein a target and an electron-beam-producing means including a field-emission cathode therein. The beam-producing means comprises a plurality of spaced, pointed protuberances pointing in the same direction. Each protuberance has its own field-emission-producing means, a separate focusing-field-producing means for focusing the electrons emitted from the protuberance into a beam and means for modulating the individual beams in concert. The structure produces a plurality of modulated beams that are projected as a bundle in substantially parallel paths, which may be further operated upon as a single composite beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.