Method and apparatus for compensating alternating electrical fields present at the front surface of a cathode picture tube
US5243262A · kind A · utility
14Cited by
2References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 17, 1991 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | Dec 17, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/0015
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for compensating the alternating electrical fields present at the front surface of a cathode ray picture tube wherein the high-voltage signal supplied to the high-voltage terminal of the tube is tapped to extract an alternating voltage signal therefrom, and the alternating voltage signal is inverted and amplified and then applied to a suitable external electrode placed in the proximity of the picture tube. The external electrode can be a framing band, an aquadag region or a ring electrode, among other things. Furthermore, combination of these electrodes can be employed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.