Method for the automatic measurement of convergence and for the determination of corrections to be made in trichromatic cathode tube deflectors and machine for the application of this method
US4925420A · kind A · utility
11Cited by
6References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1988 |
| Grant date | May 15, 1990 |
| Priority date | — |
| Expiry date | Feb 11, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/28
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
For the automatic determining of the characteristics of the corrections to be made in trichromatic cathode tube deflectors, measurements are made of the coordinates of the midpoints of the bars R and B of a crossed bar test pattern at "strategic" places. With the deflector in the "mean" position on the tube, the values obtained are standardized by computation to re-establish virtually the ideal position of the deflector, the convergence errors due to this deflector are computed and the pinpoint or overall corrections to be made to it are deduced therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.