Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1977-01-17
1979-02-27
Wilbur, Maynard R.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315 13C, 313412, H01J 2970, H01J 2976
Patent
active
041421310
ABSTRACT:
A color picture tube of an in-line type comprises means for deflecting beams of electron emitted from electron guns of the in-line type aligned horizontally such that for the horizontal deflection, the central beam is subjected to a greater deflection than side beams and for the vertical deflection, the side beams are subjected to a greater deflection than the central beam. Two vertical magnetic pole piece plates which are long vertically and thin horizontally are so disposed as to sandwich the central beam near the outlet of the central electron gun in order to weaken horizontal deflection magnetic field acting on the central beam, whereby a portion of the horizontal deflection magnetic flux acting on the central beam is absorbed by the two magnetic pole piece plates. The vertical deflection magnetic field is almost not affected by these vertical magnetic pole piece plates. Further, two horizontal magnetic pole piece plates which are long horizontally and short vertically are so disposed as to sandwich side beams near the outlets of the side electron guns in order to weaken vertical deflection magnetic fields acting on the side beams and to intensity vertical deflection magnetic fields acting on the central beam.
REFERENCES:
patent: 2907915 (1959-10-01), Gleichauf
patent: 2923844 (1960-02-01), Gundert
Ando Kunio
Hirota Ryoichi
Maruyama Koichi
Osakabe Kuniharu
Blum T. M.
Hitachi , Ltd.
Wilbur Maynard R.
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