Method for measuring the convergence of a three-gun shadow-mask cathode-ray tube and a device for the application of said method
US4635095A · kind A · utility
21Cited by
5References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 21, 1984 |
| Grant date | Jan 6, 1987 |
| Priority date | — |
| Expiry date | Mar 21, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/42
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Monochrome bar patterns approximately seven millimeters in width are produced on the screen of a three-color television picture tube by means of a video signal having a substantially Gaussian waveform. The value of the convergence component is given by the distance between centers of two bars of different colors. Measurement of convergence is carried out by means of a photosensor consisting of a charge-coupled photosensitive strip and an optical system comprising a biconvex lens and a cylindrical lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.