Plural beam electron gun

Claim 1

IN AN ELECTRON GUN COMPRISING A HOT CATHODE, AN ANODE HAVING A PLURALITY OF APERTURES LATERALLY ADJACENT BUT SPACED FROM EACH OTHER AT ONE SIDE OF SAID HOT CATHODE, A FOCUSING ELECTRODE INTERPOSED BETWEEN SAID HOT CATHODE AND SAID ANODE, SAID ELECTRODE HAVING A PLURALITY OF APERTURES SUBSTANTIALLY IN AXIAL ALIGNMENT WITH THE CORRESPONDING APERTURES IN SAID ANODE FOR PASSING SEPARATE ELECTRON BEAMS FROM SAID HOT CATHODE THROUGH THE DIFFERENT ALIGNED APERTURES, AND A PLURALITY OF ELECTROMAGNETS AT THE OTHER SIDE OF SAID ANODE EACH HAVING A COIL AND A FERROMAGNETIC CORE, THE OPPOSITE ENDS OF ADJACENT CORES BEING SPACED FROM EACH OTHER TO FORM GAPS SUBSTANTIALLY IN ALIGNMENT WITH SAID APERTURES FOR FORMING MAGNETIC FIELDS FOR INDEPENDENTLY DEFLECTING EACH OF SAID ELECTRON BEAMS PASSING THROUGH SAID APERTURES IN SAID FOCUSING ELECTRODE AND ANODE AND THEN THROUGH SAID GAPS.