Method of making magnetic transducer heads

Claim 1

THE METHOD OF MAKING A MULTITRACK MAGNETIC TRANSDUCER HEAD COMPRISING THE STEPS OF: FORMING A FIRST AND A SECOND SUB-ASSEMBLY EACH BY PROVIDING A PLURALITY OF MAGNETIC POLE PIECES HAVING A PAIR OF POLE TIP FACES, WINDING COIL MEANS ABOUT A PLURALITY OF SAID POLE PIECES, HOLDING ALL OF SAID POLE PIECES IN A MOLD IN PARALLEL CLOSELY SPACED SIDE-BY-SIDE RELATIONSHIP WITH THEIR POLE TIP FACES APPROXIMATELY ALIGNED IN A PLANE, WHILE HOLDING SAID POLE PIECES IN SAID MOLE CASTING A HARDENABLE LIQUID MATERIAL INTO SAID MOLD, CAUSING SAID LIQUID MATERIAL TO HARDEN TO FIRMLY HOLD SAID POLE PIECES IN SAID DEFINED POSITIONAL RELATIONSHIP, REMOVING FROM SAID MOLD THE BLOCK OF HARDENED MATERIAL HAVING EMBEDDED IN IT SAID POSITION POLE PIECES, LAPPING SAID APPROXIMATELY ALIGNED POLE TIP FACES TO SUBSTANTIALLY PERFECTLY ALIGN THEM IN A PLANE; PROVIDING THIN, NON-MAGNETIC SPACER MEANS; HOLDING SAID FIRST AND SECOND SUB-ASSEMBLIES IN CONTACT WITH OPPOSITE SIDES OF SAID SPACER MEANS AND WITH THE POLE TIP FACES OF ONE SUB-ASSEMBLY IN REGISTRATION WITH THE POLE TIP FACES OF THE OTHER SUBASSEMBLY FORMING A PLURALITY OF SUBSTANTIALLY CLOSED MAGNETIC PATHS EACH HAVING AT LEAST ONE OF SAID WOUND POLE PIECES, APPLYING HARDENABLE LIQUID CASTING MATERIAL TO SAID TWO SUB-ASSEMBLIES WHILE HOLDING THEN IN SAID POSITION; AND CAUSING SAID CASTING MATERIAL TO HARDEN INTO A UNITARY BLOCK.

Claim 2

THE METHOD OF MAKING A MULTITRACK MAGNETIC TRANSDUCER HEAD COMPRISING THE STEPS OF: FORMING A FIRST AND A SECOND SUB-ASSEMBLY EACH BY PROVIDING A PLURALITY OF MAGNETIC POLE PIECES HAVING A PAIR OF POLE TIP FACES, WINDING COIL MEANS ABOUT A PLURALITY OF SAID POLE PIECES, HOLDING ALL OF SAID POLE PIECES IN A MOLD IN PARALLEL CLOSELY SPACED SIDE-BY-SIDE RELATIONSHIP WITH THEIR POLE TIP FACES APPROXIMATELY ALIGNED IN A PLANE, WHILE HOLDING SAID POLE PIECES IN SAID MOLE CASTING A HARDENABLE LIQUID MATERIAL INTO SAID MOLD, CAUSING SAID LIQUID MATERIAL TO HARDEN TO FIRMLY HOLD SAID POLE PIECES IN SAID DEFINED POSITIONAL RELATIONSHIP, REMOVING FROM SAID MOLD THE BLOCK OF HARDENED MATERIAL HAVING EMBEDDED IN IT SAID POSITION POLE PIECES, LAPPING SAID APPROXIMATELY ALIGNED POLE TIP FACES TO SUBSTANTIALLY PERFECTLY ALIGN THEM IN A PLANE; PROVIDING THIN, NON-MAGNETIC SPACER MEANS; HOLDING SAID FIRST AND SECOND SUB-ASSEMBLIES IN CONTACT WITH OPPOSITE SIDES OF SAID SPACER MEANS AND WITH THE POLE TIP FACES OF ONE SUB-ASSEMBLY IN REGISTRATION WITH THE POLE TIP FACES OF THE OTHER SUBASSEMBLY FORMING A PLURALITY OF SUBSTANTIALLY CLOSED MAGNETIC PATHS EACH HAVING AT LEAST ONE OF SAID WOUND POLE PIECES, APPLYING HARDENABLE LIQUID CASTING MATERIAL TO SAID TWO SUB-ASSEMBLIES WHILE HOLDING THEN IN SAID POSITION; AND CAUSING SAID CASTING MATERIAL TO HARDEN INTO A UNITARY BLOCK.