Deflection system with a controlled beam spot
US5028850A · kind A · utility
4Cited by
17References
63Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1990 |
| Grant date | Jul 2, 1991 |
| Priority date | — |
| Expiry date | Jul 19, 2010 |
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.