Color picture device having magnetic pole pieces

Details Color picture device having magnetic pole pieces Color picture device having magnetic pole pieces

1985-08-26

1988-02-02

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313431, H01J 2964

Patent

active

047230940

ABSTRACT:
In a color picture device having a color picture tube, three electron guns for emitting electron beams are arranged in a neck section of the tube. A shadow mask, having a number of apertures, is arranged opposing a phosphor screen of a panel section of the tube. Convergence yokes for correcting misconvergence of the three electron beams are arranged around the neck section. A convergence electrode for converging the three electron beams over the entire screen is arranged in the neck section at the ends of the guns closer to the phosphor screen. The convergence electrode has three pairs of pole pieces each of which is formed of a magnetic substance with high permeability and is arranged in the neck section so as to surround the electron beam between the pole pieces. The length Wp of each pole piece along the tube axis is about two times or more the distance G between the pole pieces, and the length Wp is about twice the thickness Wy of the convergence yoke along the tube axis. Thus, the leakage flux from the pair of pole pieces along the tube axis is 20% or less of the total magnetic field generated by the convergence yoke.

REFERENCES:
patent: 3525892 (1970-08-01), Javorik et al.
patent: 3916244 (1975-10-01), Evans, Jr.
Patent Abstracts of Japan, unexamined application, E. Section, vol. 4, No. 130, Sep. 12, 1980.

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