External magnetic field compensator for a CRT

Details External magnetic field compensator for a CRT External magnetic field compensator for a CRT

1981-10-09

1983-04-19

Dixon, Harold A.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

315370, H01J 2906

Patent

active

043807160

ABSTRACT:
Light sensors with red filters are located at four corners of a CRT out of view of the operator. A red raster is generated in the corners of the CRT, the pattern of the raster corresponding to the area covered by the sensors. A pair of coils is located about the face of the CRT in a Helmholtz configuration and are driven by a current generator in response to the sensor output to maximize sensor output, thereby generating a compensating magnetic field which cancels external axial fields affecting the CRT.

REFERENCES:
patent: 4035654 (1977-07-01), Elmer

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