Circuit for correcting east-west pincushion distortions
US4469992A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 1983 |
| Grant date | Sep 4, 1984 |
| Priority date | — |
| Expiry date | Jul 20, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/233
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit is provided for the correction of east-west pincushion distortions on the picture screen of a television receiver. The circuit includes a diode modulator, which is controlled via a coupling coil from a control stage switched by a horizontal scanning frequency, frame frequency modulated rectangular signal as well as a diode connected to the coupling coil for returning of stored energy to an electrical energy supply source of the television receiver. An electronic switch is connected in parallel to the diode. A rectangular pulse signal is applied to the control electrode of the electronic switch. The polarity of the switching connection provided by the electronic switch is opposite to that of the diode. The electronic switch permits a current directed oppositely to the current running through the diode to pass through the coupling coil during the nonconducting phase of the control stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.