Color display tube comprising a deflection yoke and deflection y

Details Color display tube comprising a deflection yoke and deflection y Color display tube comprising a deflection yoke and deflection y

1980-10-23

1983-10-11

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Electron or ion beam deflecting type

335212, H01F 700

Patent

active

044095783

ABSTRACT:
A color display tube having three electron guns situated in one plane for emitting three electron beams towards a display screen and having a deflection device which is mounted around a neck portion of the display tube and has a deflection yoke comprising: an annular core of a magnetizable material on which a field deflection coil toroidally is wound in such manner that its turns are located in planes passing through the longitudinal axis of the annular core. A dipolar field is generated in combination with a sixpole field resulting in a pin-cushion shaped overall field. To change the field at the rear end from the core from pin-cushion to barrel shape on the inside of the rear end of the annular core members of a magnetically permeable material are provided symmetrically with respect to the axis of the field deflection field. Blocks of ferrite provided adjacent the rear end of the annular core and placed opposite to each other on the axis of the field deflection magnetic field enhance the effect of the magnetically permeable members. This configuration corrects east-west raster distortions while maintaining good self-converging properties of the display tube-deflection yoke combination.

REFERENCES:
patent: 4109220 (1978-08-01), Peart
patent: 4231009 (1980-10-01), Barkow
patent: 4246560 (1981-01-01), Shimizu et al.

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