Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Patent
1988-12-02
1990-06-12
O'Shea, Sandra
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
358248, 335210, 335211, H01J 2970, H01F 700, H04N 5645
Patent
active
049335960
ABSTRACT:
In a deflection yoke for a color cathode-ray tube having an electron gun assembly for generating a plurality of electron beams which are directed longitudinally to converge substantially at the center of a screen, and in which a deflection magnetic field is provided through which the beams pass between the gun assembly and the screen so as to be deflected from the center of the screen for scanning the latter; horizontal center raster (HCR) misconvergence of the beams is avoided by providing a closed circuit in which an induced current is generated in response to a leakage magnetic field from the horizontal deflection magnetic field, and such induced current in the closed circuit generates a compensating magnetic field by which the distribution of the horizontal deflection magnetic field, in the longitudinal direction of the beams passing therethrough, is suitably altered.
REFERENCES:
patent: 3611221 (1971-10-01), Ikeuchi
patent: 3793554 (1974-02-01), Rossaert
patent: 4257024 (1981-03-01), Shimoma et al.
patent: 4445101 (1984-04-01), Kobayashi et al.
Omura Norio
Yoshii Masaaki
O'shea Sandra
Sinderbrand Alvin
Sony Corporation
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