Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1985-05-10
1987-02-10
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315400, H01J 2956
Patent
active
046425306
ABSTRACT:
A combined top and bottom pincushion and gullwing distortion correction circuit uses nonlinear reactor to introduce an appropriately modulated horizontal frequency and second harmonic of the horizontal frequency component into the vertical scanning current path. The nonlinear reactor functions as a transformer with a secondary that provides a correction voltage in series with the vertical scanning current path. The transformer effectively has two series opposing primary windings magnetically coupled to the secondary. These primaries, energized by waves at the horizontal frequency and the second harmonic frequency, alternately predominate over each other to a variable degree, and in a manner determined by the vertical scanning current, for inducing corresponding voltage at the secondary winding. The secondary winding is coupled to a first tuned circuit that generates a horizontal rate north-south pincushion correction component voltage of the total correction voltage. The secondary winding is also coupled to a second tuned circuit that generates, a horizontal frequency, second harmonic rate gullwing correction component voltage of the total correction voltage.
REFERENCES:
patent: 3329862 (1967-07-01), Lemke
patent: 3346765 (1967-10-01), Barkow
patent: 3444422 (1969-05-01), Wolber
patent: 3940662 (1976-02-01), Quirke
patent: 3968402 (1976-07-01), Sahara et al.
patent: 3982156 (1976-09-01), Monroe
patent: 4020390 (1977-04-01), Keinath et al.
patent: 4093895 (1978-06-01), Collette
U.S. patent application Ser. No. 733,661 entitled Gullwing Distortion Corrected Deflection Circuitry for a Square-Planar Picture Tube, in the names of P. E. Haferl et al, filed concurrently with the above-captioned patent application.
Blum Theodore M.
Cain D.
Henig Sammy S.
Laks Joseph J.
RCA Corporation
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