Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Patent
1980-10-14
1982-11-02
Demeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
335211, H01J 2976, H01F 312
Patent
active
043575560
ABSTRACT:
A correction apparatus for a deflection yoke for use with a color television kinescope comprises a plurality of magnetically permeable rods disposed at the rear of the yoke. Each of the rods comprises a short portion disposed parallel to the neck of the kinescope and an elongated portion disposed perpendicular to the neck of the kinescope. The elongated portions of the rods are positioned within the external field of the vertical deflection coils. Flux from the external field is channeled into the rods to form a magnetic field between the short portions of corresponding members on opposite sides of the tube neck to provide vertical coma correction. The vertical dimension of the rods is a small fraction of the diameter of the kinescope neck in order that the high permeable path presented to the external horizontal field by the rods does not appreciably distort the external horizontal field.
REFERENCES:
patent: 3020434 (1962-02-01), Bloomsburgh
patent: 4257023 (1981-03-01), Kamijo
patent: 4305055 (1981-12-01), Marrett, Jr.
patent: 4307363 (1981-12-01), McGlashan
patent: 4335366 (1982-06-01), Alig et al.
DeMeo Palmer C.
Meagher William H.
Rasmussen Paul J.
RCA Corporation
Stevens Scott J.
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