Apparatus for compensating for image rotation in a CRT display

Electric lamp and discharge devices: systems – Cathode ray tube circuits – Pulse storing

Patent

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Details

315370, 313433, 335213, H01J 2906

Patent

active

048990825

ABSTRACT:
An image rotation compensation circuit for use with a CRT. The compensation circuit includes a winding which encircles the CRT and is oriented transverse to the path of the electron beam. A controller is connected to the winding and drives a current through the winding to create a magnetic field. The direction and magnitude of the current may be adjusted by the user to substantially cancel an external magnetic field and thus eliminate any image rotation caused thereby.

REFERENCES:
patent: 3018401 (1962-01-01), Stanley
patent: 3735193 (1973-05-01), Ikeuchi
patent: 4296359 (1981-10-01), Dodds

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