Method of making a composite core transducer

Details Method of making a composite core transducer Method of making a composite core transducer

1990-12-13

1991-07-09

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

360120, 360126, G11B 542

Patent

active

050293800

ABSTRACT:
A magnetic transducer and manufacturing method, where a transducer core is made from a composite block of magnetic material. The composite block has a first portion made of a first magnetic material, and a second portion made of a second magnetic material, the two block portions being integrally joined at corresponding planar surfaces. In the preferred embodiment, the first magnetic material is selected to have high granular density and other physical and magnetic properties which are necessary to obtain excellent transducing gap definition. The second magnetic material is selected to obtain high transducer performance. The composite block is machined around a periphery thereof at surfaces extending at oblique angles to said joined surfaces to provide a magnetic core having its first portion reduced to a wedge shaped portion. The wedge shaped portion has a first thusly obtained surface extending in a transducer-to-medium interface, a second surface extending in a transducing gap plane, and a third surface, corresponding to the integrally joined surfaces. The oblique angle between the second and third surface is selected along with other design parameters to obtain a desired small length of the wedge shaped portion in the transducer-to-medium contact area, while the total amount of the first magnetic material in the transducer is significantly reduced.

REFERENCES:
patent: 4704788 (1987-11-01), Eckstein
patent: 4839959 (1989-06-01), Mersing

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