Line deflection circuit for picture pick-up or display devices
US4672449A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 26, 1985 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | Aug 26, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A picture pick-up or display device, respectively for recording a scene or displaying a scene image, respectively with the aid of a line raster formed by a plurality of horizontal lines which are consecutively scanned in opposite directions. The device comprises a line deflection circuit in which the line deflection coil forms part of a resonant circuit whose tuning frequency is substantially equal to half the line frequency, as a result of which the power dissipation is kept low. By means of a control circuit it is ensured that corresponding points of scanned lines are accurately in line in the vertical direction, the control circuit being arranged for causing a zero-crossing of the line deflection current and a signal which is characteristic of half the video information of a line substantially to coincide. The control circuit comprises an analogue delay element for setting the time position of this signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.