Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1996-06-06
1998-08-11
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315371, H01J 2956
Patent
active
057931658
ABSTRACT:
A deflection yoke device for use in three-gun color picture tube of television receivers includes a pair of vertical deflection coils which are divided into barrel magnetic field production coil sections and pincushion magnetic field production coil sections. The yoke also includes a varistor that controls the flow of current for corrections of cross-misconvergence PQV and misconvergence S3V while suppressing or eliminating white rasters. More specifically, the pair of vertical deflection coils are subdivided into a series circuit of two barrel magnetic field production coil sections and another series circuit of two pincushion magnetic field production coil sections to which the varistor is connected. The varistor produces a barrel magnetic field in the center region of a display screen where vertical deflection current remains relatively small, while allowing a pincushion magnetic field to be created in the upper and lower peripheral sections thereof where the vertical deflection current increases. This eliminates rapid switching of the nature of the vertical magnetic field in nature from the barrel magnetic field to the pincushion magnetic field so that white rasters will no longer be generated on the screen.
REFERENCES:
patent: 3803444 (1974-04-01), Gerritsen et al.
patent: 4547707 (1985-10-01), Yabase
patent: 5079486 (1992-01-01), Honda et al.
patent: 5177412 (1993-01-01), Morohashi et al.
Hayashi Yoshihisa
Yamasaki Kouichi
Blum Theodore M.
Murata Manufacturing Co. Ltd.
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