Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1981-07-09
1983-10-18
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315 13C, H01J 2970, H01J 2976
Patent
active
044108400
ABSTRACT:
A color cathode ray tube display apparatus is provided with compensation for errors due to interfering magnetic fields in which a deflection yoke causes the electron beams to raster scan across the tube, a convergence assembly on the neck of the cathode ray tube adjusting the beam convergence. Errors in the waveforms suppied to the radial convergence assembly are caused by high frequency magnetic field coupling between the yoke and the convergence assembly via the internal magnetic structure 7 of the cathode ray tube. A compensating coil 11, placed adjacent the convergence coil unit 12, 16 supplies compensating current through resistor 20 to the amplifier 15 driving the convergence coil unit, thus avoiding a fringe on the left-hand side of the screen. Alternatively, compensating current can be derived from the line flyback pulse or the logic signal initiating line flyback.
REFERENCES:
patent: 3743882 (1973-07-01), Kroner et al.
patent: 3821591 (1974-06-01), Lister
patent: 4095137 (1978-06-01), Oswald
patent: 4097784 (1978-06-01), Fischman et al.
Beeteson John S.
Holloway Brian L.
Jarzebowski Krzystof T.
Blum Theodore M.
Connerton Joseph J.
International Business Machines - Corporation
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