Electron gun capable of suppressing the influence of electron emission from the cathode side surface
US10475618B2 · kind B2 · utility
0Cited by
7References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 23, 2018 |
| Grant date | Nov 12, 2019 |
| Priority date | — |
| Expiry date | Jul 23, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/22
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
To suppress both influence of electron emission from a cathode side surface and consumption of energy to be supplied to a heater, while being provided with a grid, an electron gun of the present invention includes: a cathode capable of emitting electrons by heating; a grid capable of controlling the electron emission; and a cathode shield which is an conductor including a material portion located in the vicinity of a side surface of the cathode and facing at least a portion of the side surface via a gap or a heat insulating material, and not being made in direct physical coupling nor in direct physical contact with the cathode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.