Title: Switched vertical deflection system

Abstract: First and second controllable switching stages are respectively coupled between a source of horizontal retrace pulses and a capacitor connected across a vertical deflection winding. A modulator is coupled to the switching stages for controlling the timing of conduction thereof relative to the timing of the horizontal retrace pulses. One switching stage charges the capacitor in one polarity with pulses of current of gradually decreasing amplitude and duration during a first portion of the vertical trace interval and the other switching stage charges the capacitor in the opposite polarity with pulses of current of gradually increasing amplitude and duration during a second portion of the vertical trace interval. The capacitor supplies scanning current of first and second polarities to the vertical deflection winding during respective first and second portions of each vertical trace interval.

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Inventors: Haferl, Peter Eduard (Zurich, CH)

Application Number: 595809
Filing Date: 1975-07-14
Publication_date: 1977-09-13
Assignee: RCA Corporation (New York, NY)
Primary Class(es): 315/408 315/399
Other Classes:
US Patent Ref:

2760109	Aug, 1956	Schade	315/399.
2916665	Dec, 1959	Schlesinger	315/399.
2956202	Oct, 1960	Rhodes	315/393.
3700958	Oct, 1972	Haferl	315/371.
3916254	Oct, 1975	Worster et al.	315/371.
3968403	Apr, 1976	Ogawara	315/371.

Other Refs:
Primary Examiner: Wilbur, Maynard R.
Assistant Examiner: Blum, T. M.
Attorney: Whitacre; Eugene M., Rasmussen; Paul J.