CRT scan system dynamic focus circuit
US5235257A · kind A · utility
1Cited by
1References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 11, 1992 |
| Grant date | Aug 10, 1993 |
| Priority date | — |
| Expiry date | Sep 11, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/26
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for generating a dynamic focus correction voltage signal for a cathode ray tube which comprises the steps of: generating horizontal and vertical scan counter signals, and inputting the counter signals to a dynamic output voltage generating means which produces an output voltage that is proportional to the distance the scan is from the center of the image on the CRT in both the vertical and the horizontal directions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.