Method and apparatus for deflecting a charged particle stream
US5825123A · kind A · utility
Inventor
Key dates
| Filing date | Mar 28, 1996 |
| Grant date | Oct 20, 1998 |
| Priority date | — |
| Expiry date | Mar 28, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/74
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for deflecting a charged particle stream. The system can include plural vertical and horizontal deflection plates, although a single vertical deflection plate and reference potential plane is preferred. Both orthogonal and preferably tilted display screens are employed to receive the scan. The particle stream is injected offset from a centered position and the stream is scanned asymmetrically away from one deflection plate. A computer program is employed to calculate the offset position. An external quadrupole is employed to correct any aberration in the particle stream. In one embodiment, the system comprises a cathode ray tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.