Process and apparatus for the rapid adjustment of the static convergence and purity in a television tube, by using a permanent magnet
US4636694A · kind A · utility
5Cited by
2References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1985 |
| Grant date | Jan 13, 1987 |
| Priority date | — |
| Expiry date | Oct 30, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Process for adjusting the static convergence and/or purity of a color television tube by using a magnetic ring surrounding the neck of the tube and coils creating in this ring induction poles of values selected to carry out the adjustment. To the terminals of each coil a current impulse is applied conferring on the remanent induction an important value higher than that necessary to carry out the correction; then a current impulse is applied in the opposite direction effecting a partial demagnetization in such a way that the remanent induction allows the desired adjustment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.