Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Patent
1987-07-06
1989-04-18
Moore, David K.
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
313437, 313440, 335210, H01J 2970
Patent
active
048230464
ABSTRACT:
An in-line color picture tube including a deflection unit having a system of deflection coils accommodating two sets of soft magnetic correction elements. The first set is provided in the proximity of the center of the vertical deflection field and symmetrically with respect to the plane through the non-deflected electron beams. The second set is also provided in the proximity of the center of the vertical deflection field, but closer to the entrance side thereof and symmetrically with respect to the plane through the tube axis which is at right angles to the plane through the non-deflected electron beams. The second set of correction elements is thereby angularly rotated 90.degree. relative to the first set of correction elements. The first set provides conventional astigmatism correction, and the second set provides astigmatism correction of higher order components of the deflection field.
REFERENCES:
patent: 4143345 (1979-03-01), Barkow
patent: 4231009 (1980-10-01), Barkow
patent: 4242612 (1980-12-01), Heijnemans et al.
patent: 4307363 (1981-12-01), McGlashen
patent: 4415831 (1983-11-01), Konosv
patent: 4524340 (1985-06-01), Sluyterman
patent: 4618843 (1986-10-01), Nakamura
Briody Thomas A.
Eason Leroy
Horabik Michael
Moore David K.
Tamoshunas Algy
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