Arrangement for correcting the geometry of the picture of a television picture tube by means of one or more adjustably mounted magnets

Claim 1

AN ARRANGEMENT FOR CORRECTING THE GEOMETRY OF THE PICTURE OF A TELEVISION PICTURE TUBE BY MEANS OF AN ADJUSTABLY MOUNTED PERMANENT MAGNET, COMPRISING, IN COMBINATION: (A) A DEFLECTION UNIT PROVIDED WITH AT LEAST ONE ELONGATED SLOT; AND (B) AT LEAST ONE MOUNTING FOR SECURING A PERMANENT MAGNET TO SAID DEFLECTION UNIT, SAID MOUNTING HAVING A MAIN PART HOLDING A PERMANENT MAGNET AND A LUG PROJECTING FROM SAID MAIN PART, SAID LUG HAVING A DIAMETER WHICH IS SUBSTANTIALLY EQUAL TO THE WIDTH OF SAID SLOT, SAID LUG BEING PROVIDED WITH AN ENLARGED FREE END: SAID MOUNTING BEING ARRANGED ON SAID DEFLECTION UNIT WITH SAID LUG PASSING THROUGH SAID SLOT, THEREBY TO ALLOW SAID MOUNTING WITH THE PERMANENT MAGNET HELD THEREBY TO BE SLIDABLY MOVED WITH RESPECT TO SAID DEFLECTION UNIT IN THE DIRECTION OF THE LENGTH OF SAID SLOT AND ALSO TO BE ROTATED WITH RESPECT TO SAID DEFLECTION UNIT ABOUT THE AXIS OF SAID LUG; SAID MAIN PART INCLUDING A CLAMPING PORTION FOR RECEIVING THE PERMANENT MAGNET, SAID LUG BEING SPACED FROM SAID CLAMPING PORTION THEREBY TO CAUSE DISPLACEMENT OF SAID CLAMPING PORTION AND THE MAGNET CLAMPED THEREBY, WHEN SAID MOUNTING IS ROTATED ABOUT SAID LUG AXIS.