Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1987-09-29
1988-10-25
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315370, 315408, 315410, 315411, H01J 2956
Patent
active
047806486
ABSTRACT:
In a deflection apparatus which corrects for inside pincushion distortion, a deflection winding and a retrace capacitance form a retrace circuit during a retrace interval. A trace capacitance forms a trace resonant circuit with the deflection winding during the trace interval. A circuit branch that includes a second capacitance and a modulation inductance is coupled to the trace capacitance during the trace interval to form with the trace capacitance a second resonant circuit having a resonance frequency that is substantially higher during the trace interval than that of the trace resonant circuit. A current in the circuit branch modulates the trace parabolic voltage across the trace capacitance in a manner to reduce inside pincushion distortion. A supply current is coupled to an intermediate terminal of the modulation inductance for reducing "mouseteeth" raster distortions.
REFERENCES:
patent: 4144479 (1979-03-01), Farina et al.
patent: 4429257 (1984-01-01), Haferl
patent: 4468593 (1984-08-01), Haferl
patent: 4516058 (1985-05-01), Haferl
patent: 4572993 (1986-02-01), Haferl
patent: 4625154 (1986-11-01), Willis
patent: 4634937 (1987-01-01), Haferl
patent: 4634938 (1987-01-01), Haferl
patent: 4686430 (1987-08-01), Jennings, Jr.
patent: 4687972 (1987-08-01), Haferl
patent: 4719392 (1988-01-01), Haferl
Technical Publication 201 Published by Phillips Co., Dated Apr. 10, 1986.
U.S. patent application No. 875,708 filed 6/18/86, entitled Raster Correction Circuit, in the name of P. E. Haferl.
U.S. patent application No. 102,584 entitled, Raster Distortion Correction for a Deflection Circuit, in the name of P. E. Haferl.
Blum Theodore M.
Cain David
Henig Sammy S.
Laks Joseph J.
RCA Licensing Corporation
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