Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1982-04-05
1986-11-18
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
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.
Olmstead H. Wayne
Wahlquist Clayton C.
Blum Theodore M.
Campbell James
Issing Gregory C.
Tektronix Inc.
Winkelman John D.
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