Inductive transducer with closed-loop pole circumscribing I-shap

Details Inductive transducer with closed-loop pole circumscribing I-shap Inductive transducer with closed-loop pole circumscribing I-shap

1994-10-21

1996-08-13

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Head

Core

G11B 5197

Patent

active

055462561

ABSTRACT:
A magnetic pole assembly for a transducer includes a first pole piece having first and second arms joined to form front and back regions. The first and second arms are spaced between the front and back regions to form a region of low leakage-flux density. A second pole piece having front and back regions lies partly in the region of low leakage-flux density between the first and second arms of the first pole. The back region of the second pole is joined to the back region of the first pole, and the front regions of the first and second poles confront to form a gap. In one embodiment, the first and second poles are each formed of first and second portions with the first portion of the first pole and the second portion of the second pole formed in a first thin-film layer and the second portion of the first pole and the first portion of the second pole formed in a second thin-film layer spaced apart and substantially parallel to the first layer. Vias join the first and second portions of the poles together as well as the back portions of the poles. An inductive coil has a plurality of convolutions lying between the two layers, each convolution passing between the poles twice.

REFERENCES:
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patent: 4374403 (1983-02-01), Oshima et al.
patent: 4566050 (1986-01-01), Beam et al.
patent: 4782415 (1988-11-01), Vinal
patent: 4816947 (1989-03-01), Vinal et al.
patent: 5095397 (1992-03-01), Nagata et al.
patent: 5164869 (1992-11-01), Fontana, Jr. et al.
patent: 5195005 (1993-03-01), Mallary
patent: 5452168 (1995-09-01), Nepela

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