Cathode for electron tube and manufacturing method thereof
US5015497A · kind A · utility
0Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1989 |
| Grant date | May 14, 1991 |
| Priority date | — |
| Expiry date | Jul 10, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/042
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cathode for an electron tube in accordance with the present invention comprises: a base (2) containing not only nickel as a major element but also a reducing agent; a layer (3) of an electron-emissive substance which is applied to the base (2) and contains not only an alkaline earth metal oxide as a principal component but also a scandium oxide; and a heater for heating the layer (3).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.