Deflection yoke with permanent magnet raster correction

Details Deflection yoke with permanent magnet raster correction Deflection yoke with permanent magnet raster correction

H - Electricity

01

J

313/35.124

H01J 29/76 (2006.01) H01F 5/00 (2006.01) H04N 3/237 (2006.01)

Patent

CA 1124308

RCA 73,015 DEFLECTION YOKE WITH PERMANENT MAGNET RASTER CORRECTION Abstract of the Disclosure A deflection yoke of the self-converging type utilizing pincushion-shaped horizontal and barrel-shaped vertical deflection fields for converging three in-line electron beams includes magnets disposed near the top and bottom beam exit end of the yoke and respectively poled to produce flux of the same polarity as the vertical deflection field at the top and bottom portions of the raster. A second pair of magnets disposed inside the flared inner surface of the yoke at the top and bottom approximately at the center of the yoke length are respectively poled for producing flux which is of the opposite polarity of the vertical deflection field at the top and bottom portions of the raster, the two pairs of magnets cooperating with the deflection field for correcting North-South pincushion distortion with substan- tially no effect on the beam convergence.

328042

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