Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1994-12-29
1997-08-26
Issing, Gregory C.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
G09G 104
Patent
active
056613750
ABSTRACT:
A modulation circuit (Q.sub.1) supplies a correction current (i.sub.2) to an S-shaping capacitor (C.sub.23) to modulate the voltage across a deflection winding (L.sub.H) for correction of inner raster distortion. The frequency of the correction current is lower than line frequency for the correction of inner pincushion or barrel distortion. For correction of second order inner pincushion or barrel distortion, the frequency is higher than line frequency. The direction of the correction current in the S-capacitor can be made the same or opposite to the deflection current, resulting in an additive or a subtractive correction. The amount of the inner correction is adjustable independent of the outside raster correction. The modulation circuit is driven by deflection energy and is independent of the flyback transformer (T.sub.20).
REFERENCES:
patent: 4565949 (1986-01-01), Haferl
patent: 4719392 (1988-01-01), Haferl
patent: 5115171 (1992-05-01), Haferl
patent: 5194784 (1993-03-01), Tripod
Issing Gregory C.
Laks Joseph J.
RCA Thomson Licensing Corporation
Sragow Daniel E.
Tripoli Joseph S.
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