Shallow magnetic head shield for reducing feedthrough

Details Shallow magnetic head shield for reducing feedthrough Shallow magnetic head shield for reducing feedthrough

1990-05-09

1990-10-30

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Head

Head accessory

G11B 511

Patent

active

049673017

ABSTRACT:
A magnetic head is disclosed in which thin strips of shielding are inlaid into the surface of the magnetic head between the read and write gaps for reducing feedthrough. The shielding extends across a substantial portion of the tape-engaging surface between the read and write gaps. Further reduction of feedthrough is achieved by inlaying additional shielding outboard of the read gaps. The shielding does not encircle individual read or write gaps, but may extend across tracks in a multitrack head. The shielding is made of a magnetically permeable material which absorbs magnetic flux which otherwise strays from the magnetic cores. Material and manufacturing costs are maintained low because the shields are small and simple in geometry.

REFERENCES:
patent: 3042753 (1962-07-01), Iwamura
patent: 3700828 (1972-10-01), Zacaroli
patent: 3744040 (1973-07-01), Honegger et al.
patent: 3806902 (1974-04-01), Drees et al.
patent: 3895002 (1975-07-01), Ridgway et al.
patent: 4622616 (1986-11-01), Isshiki
"Low Noise Magnetic Recording Head", IBM Technical Disclosure Bulletin, vol. 8, No. 4, Sep. 1965, pp. 499-500.
Jorgensen, Finn, "The Complete Handbook of Magnetic Recording", Jul. 1980, pp. 152-154.

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