Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1982-05-28
1983-12-27
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2956
Patent
active
044233582
ABSTRACT:
In a television display system, a deflection yoke is placed over the neck of a cathode ray tube to generate a raster by means of simultaneous horizontal and vertical sweep of the electron beams. A picture, derived from information contained in the composite video signal produced by the signal processing circuits, is displayed on the screen of the cathode ray tube. In the horizontal deflection circuit portion of the television display system, a trace capacitor is coupled to a deflection winding. A trace switch, responsive to a deflection rate signal that is synchronized with the composite video signal, periodically applies to the deflection winding the voltage developed across the trace capacitor to generate raster scanning current in the deflection winding during a deflection cycle. The losses incurred during a deflection cycle tend to produce a scanning current waveform that introduces asymmetrical linearity distortion to the picture display. A switched current source is coupled to the deflection winding to develop a DC component that flows in a direction that provides correction for the introduction of the asymmetrical linearity distortion. The DC component is of sufficient magnitude to by itself produce substantially all of the change to the scanning current needed to obtain a picture display that is substantially corrected for the asymmetrical linearity distortion.
REFERENCES:
patent: Re25772 (1965-05-01), Glaisher
patent: 2780749 (1957-02-01), Dietch
patent: 2835846 (1958-05-01), Teetor
patent: 2871405 (1959-01-01), Vonderschmitt
patent: 3200288 (1965-08-01), Tanner
patent: 3310705 (1967-03-01), Nicholson
patent: 3510723 (1970-05-01), Dumas
patent: 3814981 (1974-06-01), Rusk
patent: 3962603 (1976-06-01), Van der Vegt
patent: 4037137 (1977-07-01), Dietz
patent: 4281275 (1981-07-01), Chapman et al.
RCA Television Service Data, Chassis CTC 87 Series, File 1978 C-2, copyright 1978; pp. 1, 5-27 and electrical schematic pp. 28-33.
RCA Television Service Data, Chassis CTC 101 Series, File 1980 C-7, copyright 1980; pp. 1, 8-17 and electrical schematic pp. 38-43.
Blum Theodore M.
Laks Joseph
Rasmussen P. J.
RCA Corporation
Whitacre E. M.
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