External magnetic field compensator for a crt

Details External magnetic field compensator for a crt External magnetic field compensator for a crt

G - Physics

09

G

375/46

G09G 1/00 (2006.01) H04N 9/29 (2006.01)

Patent

CA 1165910

DOCKET H4207.01 FRA:1hw EXTERNAL MAGNETIC FIELD COMPENSATOR FOR A CRT ABSTRACT OF THE DISCLOSURE 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. -1-

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