Electron gun cathode with a metal layer having a recess
US6255764A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1999 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Apr 23, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/142
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a cathode for an electron gun for increasing its life cycle under a high current density load by ensuring a steady diffusion path of reducing component served for generating free radical barium. The present invention discloses a cathode for an electron gun comprising a base metal composed of nickel and at least one kind of reducing component, a metal layer having a recess to enlarge an overall surface area of the metal layer, the metal layer being disposed on the base metal, and an electron emitting layer containing alkaline earth metal oxide including at least barium. The cathode for an electron further comprises a second metal layer disposed on the lower side of the base metal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.