Color cathode ray tube with a dynamic convergence device and col

Details Color cathode ray tube with a dynamic convergence device and col Color cathode ray tube with a dynamic convergence device and col

1996-07-19

1998-10-27

Patel, Nimeshkumar

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313414, 313428, 313430, 313450, H01J 2970

Patent

active

058281673

ABSTRACT:
A color cathode ray tube includes a three beam inline electron gun; a deflection device for performing deflection and self-convergence; a static beam convergence device having permanent magnets for generating a magnetic field adjustable to converge three electron beams at a central portion of a phosphor screen; and a dynamic convergence device having coreless electromagnetic coils for generating a magnetic field adjustable to converge three electron beams at peripheral portions of the phosphor screen. The dynamic beam convergence device includes a spiral coil conductor formed on a non-magnetic film. The dynamic beam convergence device also includes two cylindrical holder members having large and small diameters, respectively, made of an insulating material, which are held in such a manner as to be coaxial and overlapped on each other; and a coil member including a plurality of printed coils for generating magnetic fields having an even number of poles contained in a flexible film, the coil member being disposed between the two cylindrical holder members having large and small diameters respectively; wherein a plurality of the printed coils are stacked in the flexible film in such a manner as to be insulated from each other; and printed coils adjacent to each other and having the same diameter are electrically connected to each other in the flexible film.

REFERENCES:
patent: 4455541 (1984-06-01), Nosaka
patent: 4896071 (1990-01-01), Pons
patent: 4900979 (1990-02-01), Shimoma et al.
patent: 5015925 (1991-05-01), Spanjer et al.
patent: 5227692 (1993-07-01), Lee
patent: 5233267 (1993-08-01), Tominaga et al.
patent: 5512802 (1996-04-01), Jamar

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