Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Patent
1984-03-20
1985-09-24
DeMeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
313432, 313449, 313460, 315 15, 315 17, H01J 2970, H01J 2946
Patent
active
045435081
ABSTRACT:
A generally box shaped, electronic lens system is incorporated in a cathode ray tube for amplification of both horizontal and vertical deflections of the electron beam. The lens system comprises two electrodes, one partly nested in the other with an insulating gap therebetween and both so disposed as to encompass the trajectories of the beam from the deflection system to the target of the CRT. A postaccelerating or other postdeflection electrode is provided to exert its field upon at least the target side end of the lens system. Upon application of prescribed potentials to the two lens electrodes and to the postdeflection electrode, the lens system provides a quadrupolar lens therein for deflection amplification in both directions. The lens system further coacts with the postdeflection electrode to create another electron lens adjacent its beam exit end for converging the beam in one of the orthogonal directions of beam deflection.
REFERENCES:
patent: 3496406 (1970-02-01), Deschamps
patent: 4142128 (1979-02-01), Odenthal
patent: 4302704 (1981-11-01), Saito
DeMeo Palmer C.
Iwatsu Electric Co. Ltd.
Wieder K.
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