Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1984-11-19
1986-01-21
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01K 2956
Patent
active
045659494
ABSTRACT:
An inside-outside pincushion correction circuit includes an arrangement of first and second branches that provide a pair of current paths to a deflection current that flows in a deflection winding. The first branch includes a modulation inductance and the second branch includes a modulation capacitance that is coupled across the modulation inductance by a switch at a controllable time during the retrace interval. The controllable time varies in a vertical rate parabolic manner to provide deflection current modulation to correct inside and outside pincushion distortions. Variation of the retrace interval associated with the modulation inductance are compensated by offsetting variations produced by the retrace capacitance.
REFERENCES:
patent: 4088931 (1978-05-01), Haferl
patent: 4140949 (1979-02-01), Terry
patent: 4206388 (1980-06-01), Ishigaki et al.
patent: 4242714 (1980-12-01), Yoshida et al.
A report, Electronic Application Laboratory Report, by group C.A.B., entitled, A New Design of a Diode Modulator for East-West Raster Correction in CTV Receivers, by A. H. Nillesen, dated Apr. 17, 1973.
Schematic p. 82 of a Japanese TV Schematic Book dated Sep. 1983.
Blum Theodore M.
Henig Sammy S.
Laks Joseph J.
RCA Corporation
Whitacre Eugene M.
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