Pincushion distortion correction device
US4737692A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1985 |
| Grant date | Apr 12, 1988 |
| Priority date | — |
| Expiry date | Oct 25, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/237
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A deflection yoke unit to be mounted on a cathode ray tube has a core on which a set of vertical deflection coils and a set of horizontal deflection coils are wound. A pincushion distortion correction device is provided for the deflection yoke unit. The correction device has a set of correction coils having a coil conductor mass quantity and an inductance which are smaller than those of the vertical deflection coil set and having a winding density distribution which is similar to that of the vertical deflection coil set. An upper and lower pincushion distortion correction current is passed through the correction coil set to correct upper and lower pincushion distortions in pictures displayed on a screen of the cathode ray tube. The core has, on its inner wall, slots in which windings of the horizontal deflection coil set, vertical deflection coil set and correction coil set for correction of the upper and lower pincushion picture distortions are received. A plurality of winding guide claw members having each two or three slots are attached to a front open end and a rear open end of the core, respectively. Front end conductors of the respective coil sets are separately placed in the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.