Apparatus for compensating for image rotation in a CRT display

Details Apparatus for compensating for image rotation in a CRT display Apparatus for compensating for image rotation in a CRT display

1989-11-29

1991-06-04

Pascal, Robert J.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

315370, 313433, 335213, H01J 2906

Patent

active

050217127

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 et al.
patent: 3735193 (1973-05-01), Ikeuchi
patent: 4296359 (1981-10-01), Dodds
patent: 4899082 (1990-02-01), Sands et al.

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