Electron gun and electron beam application device
US12334297B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 2020 |
| Grant date | Jun 17, 2025 |
| Priority date | — |
| Expiry date | Jun 29, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2237/06375
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The apparatus includes: a photocathode including a substrate and a photoelectric film formed on the substrate; a light source configured to emit a pulsed excitation light; a condenser lens facing the substrate of the photocathode and configured to condense the pulsed excitation light toward the photocathode; a first anode electrode and a second anode electrode facing the photoelectric film of the photocathode; a first power supply configured to apply a first control voltage between the first anode electrode and the second anode electrode; and a second power supply configured to apply an acceleration voltage between the photocathode and the second anode electrode. The first anode electrode is disposed between the photocathode and the second anode electrode. A surface of the first anode electrode facing the second anode electrode has a recessed shape, and a surface of the second anode electrode facing the first anode electrode has a protruding shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.