Magnetic head for stable pole tip to tape contact pressure despite head wear and tape tension variation

摘要

A magnetic head which contacts the magnetic tape (11) comprises a ferromagnetic body (12). A recess (26) is provided in this ferromagnetic body (12). A ferromagnetic core (9) has pole tips (9a,9b) which are located in the recess and which are arranged for contact with the magnetic tape. A non-magnetic material (18,20,21,22) is arranged along each side of the magnetic core pole tips in the recess. Relative hardnesses of the ferromagnetic body, ferromagnetic core pole tips, and non-magnetic material are chosen so that as the tape (11) wears away on contact surfaces of the magnetic core pole tips, non-magnetic material, and ferromagnetic body, the core pole tips (9a,9b) protrude relative to adjacent portions of the ferromagnetic body and the non-magnetic material so that the tape rides on the protruding pole tips of the core. A radius of curvature at the contact surface of the magnetic core pole tips prior to wearing of the pole tips is chosen such that it is smaller than a natural radius of bending of the tape.