Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1993-11-18
1995-01-17
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315406, G09G 104, H01J 2958
Patent
active
053828887
ABSTRACT:
An electron beam focusing device is provided for apparatus such as cathode ray tubes wherein an electron beam is scanned on a flat surface normal to the beam and converged at a point on the flat surface using magnetic fields. The focusing device includes a static field generator for converging the beam, and a dynamic focus device. The dynamic focus device is comprises a first winding coupled to a power supply, for example a current supply, for providing a magnetic field substantially defining a parabola during a trace interval of the beam to account for the variation in beam path length which occurs with scanning, and a second winding magnetically coupled to the first winding. An energy storing circuit coupled to the first and second windings stores energy during the trace interval and releases energy during the retrace interval such that the second winding induces a reverse current in the first winding, thereby returning current to the power supply during retrace. A thyristor switch references energy induced in the first winding by the second winding to ground during the retrace intervals.
REFERENCES:
patent: 3889156 (1975-06-01), Arya
patent: 4758762 (1988-07-01), Van Gorkum et al.
patent: 4912405 (1990-03-01), Richardson
patent: 5038045 (1991-08-01), Rouberol et al.
patent: 5118999 (1992-06-01), Jackson et al.
Perreaut Jean M.
Roussel Bruno F.
Fried Harvey D.
Issing Gregory C.
Laks Joseph J.
Thomson Tubes & Displays S.A.
Tripoli Joseph S.
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