Television raster pincushion distortion correction device
US4451807A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1983 |
| Grant date | May 29, 1984 |
| Priority date | — |
| Expiry date | Jul 27, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/766
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A television receiver deflection yoke mounted on a kinescope incorporates toroidally wound vertical deflection coils which generate stray fields that undesirably interact with components of adjacent receivers or video monitors. The deflection yoke incorporates magnetically permeable field forming members which utilize the stray field flux to form an electromagnetic field at the front of the yoke to aid in side pincushion distortion correction. The field forming members comprise a flux gathering portion which is located within the region of the stray field and follows the contour of the yoke core. The flux gathering portions extend along substantially the entire length of the vertical coils and are curved to encompass a significant portion of the external surface of the core in order to reduce the undesirable effects of the stray field and to form a strong pincushion distortion correcting field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.