Magnetic head

Claim 1

A composite magnetic transducer head for a magnetic tape; said transducer head comprising a central core piece, a second core piece disposed on one side of the central core piece and having the same elevation as the central core piece, and a third core piece disposed on the opposite side of the central core piece and having a reduced elevation as compared with the central core piece; each of the said core pieces having a plane upper surface and a parallel plane lower surface, a record/playback gap being defined between the central core piece, and the third core piece (and the third core piece,) and an erase gap being defined between the central core piece and the second core piece; the lower plane surface of the respective core pieces extending in the same plane with each other, and a positioning block having a thickness which is equal to the difference in elevation between the central core piece and the third core piece, the positioning block being disposed on the upper surface of the third core piece, said positioning block has a plane upper surface and a parallel plane lower surface engaging the upper surface of said third core piece; the upper surfaces of the first and second core pieces and of the positioning block extending in the same plane, all of the core pieces and the positioning block being integrally secured together; the interfitting surfaces of said members being polished to a mirror finish to present a smooth surface to said tape, said core pieces and block being enclosed by non-magnetic blocks so as to form a unitary composite transducer head.