Method of making a cathode for an electron tube
US6641450B2 · kind B2 · utility
1Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 27, 2001 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | Oct 22, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/142
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cathode for an electron tube and a preparing method therefor are provided. In the cathode for an electron tube having a base metal and an electron-emitting material layer, the particle size of the micro structure of the surface of the base metal is controlled to be in the range of 3 to 50 &mgr;m. The cathode for an electron tube has an excellent effect of diffusing intermediate products generated during the operation of the cathode, and is capable of consistently supplying a diffusion path of a reducing agent. Also, the cut off drift rate can be reduced, thereby attaining a long life span characteristic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.