Color display tube with field controller

Details Color display tube with field controller Color display tube with field controller

1987-02-10

1989-10-03

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313413, 313414, 313431, 335212, H01J 2951

Patent

active

048719404

ABSTRACT:
There is provided a color display tube having an in-line electron gun for emitting a plurality of electron beams comprising a convergence device for converging the plurality of electron beams emitted from the electron gun onto a predetermined point by using a magnetic field, a deflection device for deflecting the electron beams converged by said convergence device by using a deflection magnetic field, and a field controller disposed between the convergence device and the deflection device in order to adjust the distribution of leakage magnetic field from the deflection device so as to make the leakage magnetic field exert influence upon respective electron beams uniformly, the field controller comprising a magnetic material having relative permeability of 3,000 H/m or more and coercive force of 0.025 Oe or less.

REFERENCES:
patent: 3873879 (1975-03-01), Hughes
patent: 4245160 (1981-01-01), Harao
patent: 4473773 (1984-09-01), Sakurai et al.

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