Color display tube deflection unit which corrects left-right ras

Details Color display tube deflection unit which corrects left-right ras Color display tube deflection unit which corrects left-right ras

1986-12-22

1988-05-24

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313440, 335211, 335213, H01F 312, H01J 2976

Patent

active

047468378

ABSTRACT:
A color display tube deflection unit having an annular magnetizable core of tapered cylindrical shape and a raster distortion correction device comprising four pole shoes positioned at the corners of a rectangle adjacent the end of the core facing the display screen, the pole shoes respectively being near respective ends of a pair of vertical deflection coils. The four pole shoes are connected in pairs by respective bridging flux collector elements of soft magnetic material. The flux collector elements divert magnetic flux from the core which otherwise would not have emerged from the core, and such flux is conveyed to the pole shoes so as to cause the vertical deflection field to become pincushion-shaped adjacent the display screen.

REFERENCES:
patent: 4257023 (1981-03-01), Kamijo
patent: 4429293 (1984-01-01), McGlashan
patent: 4433268 (1984-02-01), Arisato
patent: 4556857 (1985-12-01), Logan
patent: 4636684 (1987-01-01), Yokota et al.
patent: 4668929 (1987-05-01), Bernhard

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