Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1990-04-30
1990-10-23
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2956
Patent
active
049654950
ABSTRACT:
A parabolic voltage generating circuit includes an arrangement for generating a sawtooth vertical deflection current that flows in a vertical deflection winding, in a DC blocking capacitor and in a deflection current sampling resistor. An emitter electrode of a transistor is coupled between the deflection winding and the capacitor. A base electrode of the transistor is coupled between the capacitor and the resistance. A collector current of the transistor varies in a vertical rate parabolic manner and has a DC average value that is determined by a DC average value of a voltage that is developed in the capacitor. The collector current is applied to an East-West raster distortion correction circuit for modulating an amplitude of a horizontal deflection current.
REFERENCES:
patent: 4565949 (1986-01-01), Haferl
patent: 4687972 (1987-08-01), Haferl
patent: 4794307 (1988-12-01), Haferl
patent: 4843285 (1989-06-01), Chin et al.
A Schematic Diagram of a Portion of a Television Receiver, published by Sambers, Milan, Italy, dated prior to 1985.
Smith Lawrence E.
Wilber James A.
Blum Theodore M.
Henig Sammy S.
Laks Joseph J.
RCA Licensing Corporation
Tripoli Joseph S.
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