Deflection system with a controlled beam spot
US5489824A · kind A · utility
2Cited by
26References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 17, 1993 |
| Grant date | Feb 6, 1996 |
| Priority date | — |
| Expiry date | May 17, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/285
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A deflection apparatus produces a field gradient that reduces a tendency of a major axis of a beam spot to become elongated at each corner, at each end of a horizontal axis and at each end of a vertical axis of a display screen relative to the beam spot at the center of the display screen. A beam spot stigmator causes the beam spot to be substantially anastigmatic at each of the corners, the end of the horizontal axis and the end of the vertical axis of the display screen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.