US 4,656,547 AGranted

Composite type magnetic head for recording and reproducing high frequency signals

AssigneeHitachi, Ltd.

InventorsNoriyuki Kumasaka, Hideo Fujiwara, Shigekazu Otomo, Takeo Yamashita, Shinji Takayama, Noritoshi Saito, Mitsuhiro Kudo

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Abstract

There is provided a structure of a composite type magnetic head and its manufacturing method. The composite type magnetic head comprises: two high permeability ferrite blocks with projections having nearly edged sections formed thereon; magnetic films having a high saturation flux density deposited on the side faces of the projections, the magnetic films confronting each other via a functional gap near front ends of said projections; guard films deposited over the magnetic films comprising a non-magnetic material; and non-magnetic materials filled on the guard films up to side face of the coil. This magnetic head exhibits excellent recording and reproducing characteristics. The contour effect is negligibly small. The reaction between the magnetic film and the non-magnetic material is prevented by the guard film.

Claims13

Dependent claims

A composite type magnetic head comprising:

two high permeability ferrite blocks having projections projecting towards each other in a sectional view seen from a side of a surface facing a magnetic recording medium, said ferrite blocks at a front end of each of said projections having a width smaller than a track width of a recording track of the magnetic recording medium;
magnetic substances deposited over at least both side faces of said projections of said ferrite blocks, each of said magnetic substances having a saturation flux density larger than that of said ferrite blocks, said magnetic substances confronting each other via a functional gap near front ends of said projection;
guard films deposited over said magnetic substances around side faces of said projections of said ferrite blocks, said guard films comprising a non-magnetic material;
and
non-magnetic materials filled over said guard films up to a side face of a core formed by said ferrite blocks.

2 more elements

Dependencies are inferred from the claim text.