Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1989-08-04
1990-06-19
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2956
Patent
active
049356755
ABSTRACT:
In this invention, a signal from a modulating source is applied to a parallel circuit consisting of a diode and capacitor connected between the emitter of a horizontal output transistor and a reference potential point and the discharged current of the above mentioned capacitor is modulated to be parabolic in a vertical cycle to thereby correct a pincushion distortion. A series circuit of a horizontal deflecting coil and first and second S-distortion correcting capacitors is connected between the collector and emitter of a horizontal output transistor. Further, a second series circuit consisting of a coil and capacitor is connected to the connecting point of the above mentioned S-distortion correcting capacitors. By such formation, at the time of receiving a white peak signal, the voltage at both ends of the capacitor controlled by the modulating source will become smaller, will operate to cancel the fluctuation (distortion) of the deflecting current by the reduction of the high voltage and will reduce the distortion produced by a discontinuous phenomenon of the deflecting current in the conventional circuit.
REFERENCES:
patent: 3906305 (1975-09-01), Nillesen
patent: 4254365 (1981-03-01), Knight
patent: 4482846 (1984-11-01), Worster
patent: 4733141 (1988-03-01), Watanuki
Issing Gregory C.
Kabushiki Kaisha Toshiba
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