Delay compensation in electromagnetic deflection systems
US4623825A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1982 |
| Grant date | Nov 18, 1986 |
| Priority date | — |
| Expiry date | Apr 5, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/2335
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electromagnetic deflection circuit is disclosed. The deflection circuit includes a plurality of loss elements. These loss elements are responsible for the production of an inherent time delay between the energization of the circuit by an input signal and the generation of a magnetic flux used to deflect an electron beam within a cathode-ray tube. According to an exemplified embodiment of the invention, a DC level shift signal generator, a beam position input signal generator, and an adder for adding the DC level shift signal to the beam position input signal produce an input signal that energizes the correction deflection circuit. The introduction of the DC level to the beam position input signal effectively advances, in time, the output signal from the convergence correction signal generator. This advance compensates for the various time delays present in the deflection circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.