East-west correction circuit
US4634937A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 17, 1984 |
| Grant date | Jan 6, 1987 |
| Priority date | — |
| Expiry date | Sep 17, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/233
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a deflection circuit, a flyback transformer and a retrace resonant circuit that includes a deflection winding are mutually coupled by a relatively small capacitor during the retrace interval so as to reduce transient distortions that may be caused by a sudden high beam current change. East-west modulation is provided to the deflection circuit output stage via an impedance having a relatively large value at the retrace frequency. A resonant circuit that includes the deflection winding and the flyback transformer is tuned to the retrace frequency. Synchronization information of the current through the deflection winding may be derived from a winding of the flyback transformer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.