Magnetic phonograph pickup with compensating pole piece arrangement

Claim 1

A MAGNETIC STEROPHONIC SOUND REPRODUCER FOR USE WITH PHONOGRAPHIC RECORD DISCS HAVING A SOUND GROOVE WITH TWO CHANNELS DISPOSED SUBSTANTIALLY AT RIGHT ANGLES TO EACH OTHER COMPRISING: A SUPPORT STRUCTURE, A PAIR OF CURRENT GENERATORS MOUNTED ON THE SUPPORTING STRUCTURE AND EACH INCLUDING A COIL, MEANS PROVIDING A PAIR OF FLUX PATHS EACH INCLUDING FIRST AND SECOND SPACED PROXIMATELY POSITIONED CONFRONTING POLE PIECES MADE OF MAGNETIC MATERIAL AND HAVING EXTENSIONS PROJECTING THROUGH THE RESPECTIVE COILS AND FORMING CORES FOR THE COILS, SAID POLE PIECES BEING ARRANGED IN A QUADRANGULAR CLUSTER WITH THE FIRST AND SECOND POLE PIECES IN EACH PAIR BEING DISPOSED IN OPPOSITE, PARALLEL RELATIONSHIP WITH THE FIRST POLE PIECES IN THE RESPECTIVE PAIRS BEING DISPOSED AT AN INCLUDED ANGLE TO EACH OTHER AND FACING IN A DIRECTION TOWARDS THE SURFACE OF A RECORD DISC USED THEREWITH AND WITH THE SECOND POLE PIECES IN THE RESPECTIVE PAIRS BEING DISPOSED AT A SIMILAR INCLUDED ANGLE TO EACH OTHER AND FACING AWAY FROM THE RECORD SURFACE, AND A MOVING SYSTEM ASSEMBLY INCLUDING A STYLUS, A MOVABLE MAGNETIC MEMBER HAVING A POLE CONNECTED TO THE STYLUS TO MOVE THEREWITH AND MOUNTING MEANS FOR SUPPORTING THE MOVING SYSTEM FOR OSCILLATORY MOVEMENT SO THAT THE POLE OF THE MAGNETIC MEMBER MOVES IN PATHS TOWARDS AND AWAY FROM THE OPPOSITE POLE PIECES IN EACH PAIR AND IN INDUCTIVE RELATIONSHIP THEREWITH, SAID POLE PIECES AND MOVING SYSTEM BEING MOUNTED AT AN ANGLE TO THE PLANE OF A RECORD DISC ENGAGED BY THE STYLUS SO THAT THE MAGNETIC MEMBER WHEN MOVED BY THE STYLUS IN ENGAGEMENT WITH A CHANNEL OF THE RECORD DISC IS CAUSED TO DEVIATE FROM PATHS PARALLEL TO THE CHANNELS OF THE RECORD GROOVE, SAID POLE PIECES BEING ARRANGED IN A GENERALLY DIAMOND-SHAPED CLUSTER WITH THE APICES OF THE DIAMOND BEING LOCATED AT THE INCLUDED ANGLES BETWEEN THE FIRST POLE PIECES OF THE RESPECTIVE PAIRS AND BETWEEN THE SECOND POLE PIECES OF THE RESPECTIVE PAIRS TO COMPENSATE FOR SAID DEVIATION IN MOVEMENT OF THE MAGNET TO THEREBY MINIMIZE CROSSTALK.