Switched vertical deflection system

Details Switched vertical deflection system Switched vertical deflection system

1975-07-14

1977-09-13

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315399, H01J 2970, H01J 2976

Patent

active

040485447

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.

REFERENCES:
patent: 2760109 (1956-08-01), Schade
patent: 2916665 (1959-12-01), Schlesinger
patent: 2956202 (1960-10-01), Rhodes
patent: 3700958 (1972-10-01), Haferl
patent: 3916254 (1975-10-01), Worster et al.
patent: 3968403 (1976-04-01), Ogawara

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