Cathode ray tube electron gun mount with unitary magnetic centering and gettering means

Claim 1

IN A CATHODE RAY TUBE HAVING INTEGRALLY JOINED NECK AND SCREEN PORTIONS WHEREIN AN ELECTROMAGNETIC DEFLECTION YOKE IS AXIALLY MOUNTED ON THE NECK PORTION AND ENERGIZED FOR DEFLECTING AN ELECTRON BEAM PASSING THERETHROUGH FOR SCANNING THE SCREEN PORTION OF THE CATHODE RAY TUBE, AND WHEREIN THE MAGNETIC BEAM DEFLECTION CENTER DEFINED BY THE YOKE IS TO COINCIDE WITH A DESIRED BEAM DEFLECTION CENTER WITHIN THE NECK PORTION, A BEAM CENTERING DEVICE COMPRISING AN ANNULAR PERMANENT MAGNET MOUNTED AXIALLY WITHIN THE NECK PORTION, A BEAM CENTERPROVIDING A CENTRAL APERTURE THROUGH WHICH THE ELECTRON BEAM PASSES, SAID ANNULAR PERMANENT MAGNET HAVING A RECESS THEREIN FOR RECEPTION OF GETTERING MATERIAL, AND BEING POLED TO PRODUCE A STATIS MAGNETIC FIELD OF PARALLEL FLUX LINES EXTENDING ACROSS SAID APERTURE IN A DIRECTION TRANSVERSE TO THE ELECTROM BEAM IN THE REGION OF SAID DESIRED BEAM DEFLECTION CENTER FOR EFFECTING A CONSTANT DEFLECTION THEREOF SUFFICIENT TO CENTER THE ELECTRON BEAM ON THE SCREEN PORTION.