Color television display system having improved convergence
US4335366A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1980 |
| Grant date | Jun 15, 1982 |
| Priority date | — |
| Expiry date | Feb 25, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/701
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a television receiver comprising a display system incorporating a kinescope having horizontal in-line electron beams and also incorporating a deflection yoke having toroidally-wound vertical deflection coils, where the kinescope utilizes a magnetically-permeable G3 focussing electrode in the electron guns to reduce deflection defocussing, an arrangement for correcting misconvergence of the electron beams caused by the magnetically-permeable G3 electrode comprises a pair of magnetically-permeable field formers disposed along and extending toward the rear of the yoke. The field formers are configured to collect a portion of the external fields generated by the vertical windings and direct those portions through the kinescope neck substantially at right angles to the electron beams in the vicinity of the exit end of the electron guns with a barrel-shaped transverse pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.