Resonant degaussing without residual magnetism

Details Resonant degaussing without residual magnetism Resonant degaussing without residual magnetism

1983-11-17

1985-08-13

Dixon, Harold

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Compensating for stray deflecting fields

315 10, H01J 2906

Patent

active

045352704

ABSTRACT:
A resonant degaussing circuit provides rapid recovery for use with computer monitors or video display apparatus where frequent movement of the display apparatus occurs. The degaussing circuit comprises a capacitor in parallel with a degaussing coil. Triggering of an SCR causes the capacitor to discharge, so that it resonates with the degaussing coil to produce the desired AC degaussing current. The SCR is triggered only when the vertical deflection current is substantially zero, in order to eliminate interference of the vertical flux with the degaussing current.

REFERENCES:
patent: 3733524 (1973-05-01), Cooksey et al.
patent: 3965386 (1976-06-01), Duistermaat et al.
patent: 4153858 (1979-05-01), Schylander
patent: 4380716 (1983-04-01), Romeo et al.
patent: 4441052 (1984-04-01), Willis

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