Horizontal deflection circuit with reduced VLF electric fields f

Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits

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315 8, 315 85, G09G 104, H01J 2970, H01J 2906, H01J 152

Patent

active

053630220

ABSTRACT:
A horizontal deflection circuit for a CRT supplies an exciting current in such a way that flyback voltages including both a positive voltage and a negative voltage as components are generated in horizontal deflection coils of a horizontal deflection yoke, respectively, during energizing the horizontal deflection yoke to provide a magnetic field for horizontal scans. A positive electric field of VLF and a negative electric field of VLF which are generated in the horizontal deflection yoke by the respective flyback voltages cancel each other to decrease a composite electric field of VLF emitted from the horizontal deflection yoke. This prevents unwanted radiation leaking to the outside of the a CRT display.

REFERENCES:
patent: 3764846 (1973-10-01), Gantt et al.
patent: 4540933 (1985-09-01), Teuling
patent: 5151635 (1992-09-01), Cappels
patent: 5162706 (1992-11-01), Hsu
patent: 5218270 (1993-06-01), Haapakoski

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