Delay compensation in electromagnetic deflection systems

Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits

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315370, H01J 2970, H01J 2956

Patent

active

046238255

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.

REFERENCES:
patent: 3501669 (1970-03-01), Henderson
patent: 3772566 (1973-11-01), Schwartz
patent: 4162434 (1979-07-01), Dietz
patent: 4427926 (1984-01-01), Strathman
patent: 4441057 (1984-04-01), Wrona
C. J. Boers, "Improved Circuits for 110.degree. Colour TV Picture Tube A65-140X" Philips Application Information 12/69, pp. 15-24.

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