Electrostatic lens
US8466430B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 2012 |
| Grant date | Jun 18, 2013 |
| Priority date | — |
| Expiry date | Oct 2, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2237/1205
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrostatic lens includes multiple electrodes each having a through hole, and an insulating spacer that is provided between the electrodes and that fixes an interval between the electrodes. Both surfaces of the spacer are bonded with the electrodes opposing each other so that the spacer is integral with both the electrodes. A protective film is disposed on both surfaces of each of the electrodes. The protective film is present on the interior wall of the through hole and in a region around the through hole on the surface of the electrode. The region extends continuously from the interior wall to an end portion of the electrode. The protective film is not present at an interface between the electrode and the spacer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.