Magneto-optic recording system

Claim 1

A RECORDING SYSTEM COMPRISING: A MOVEABLE MAGNETIC RECORD SURFACE; MEANS DISPOSED ADJACENT SAID SURFACE FOR MAGNETICALLY RECORDING DATA ON SAID SURFACE TO PRODUCE A SIGNAL TRACK COMPRISING A SERIES OF MAGNETIZED AREAS ON THE SURFACE WHICH ARE MAGNETIZED IN ONE OR THE OTHER OF TWO OPPOSITE DIRECTIONS FOR STORING SAID DATA; MEANS FOR FORMING A BEAM OF LIGHT AND DIRECTING SAID LIGHT BEAM ONTO SAID RECORD SURFACE AND THE SIGNAL TRACK WHEREIN A COMPONENT OF THE LIGHT IN SAID BEAM IS PARALLEL TO THE DIRECTIONS OF MAGNETIZATION OF SAID MAGNETIZED AREAS; MEANS FOR MOVING SAID RECORD SURFACE FOR PRODUCING INTERACTION BETWEEN THE LIGHT AND THE MAGNETIZED AREAS IN SAID SIGNAL TRACK WHEREBY THE LIGHT REFLECTED FROM SAID AREAS IS PARTIALLY POLARIZED IN ONE OR THE OTHER OF TWO PERPENDICULAR PLANES DEPENDING UPON THE DIRECTION OF MAGNETIZATION; POLARIZATION MEANS DISPOSED AND ARRANGED IN THE PATH OF SAID PARTIALLY POLARIZED REFLECTED LIGHT FOR SEPARATING THE REFLECTED LIGHT INTO TWO SEPARATE COMPONENT LIGHT BEAMS ACCORDING TO THEIR RESPECTIVE PLANE OF POLARIZATION COMPONENT; MEANS INDIVIDUAL TO EACH OF SAID COMPONENT LIGHT BEAMS FOR DETECTING THE LIGHT INTENSITY OF EACH BEAM TO PRODUCE DATA SIGNALS WHICH ARE SUBSTANTIALLY 180* OUT-OF-PHASE AND EXTRANEOUS IN-PHASE SIGNALS; AND MEANS FOR COMBINING SAID DATA SIGNALS ADDITIVELY TO REPRODUCE THE DATA RECORDED ON SAID SURFACE AND CANCEL THE EXTRANEOUS IN-PHASE SIGNALS.