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Browse Prior Art Database

Feedthrough Reduction in Magnetic Heads

IP.com Disclosure Number: IPCOM000073643D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Hu, PY: AUTHOR [+3]

Abstract

Feedthrough of write signals to the read gap of a magnetic read/write head is reduced by conductively coating selected areas of the head laminations.

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Feedthrough Reduction in Magnetic Heads

Feedthrough of write signals to the read gap of a magnetic read/write head is reduced by conductively coating selected areas of the head laminations.

A magnetic head core is constructed from high permeability metal laminations forming a read air gap and a write air gap. When signals are applied to the write winding, an undesired field permeates the core laminations to cause feedthrough noise in the read winding.

This field is reduced by a conductive coating, such as copper, discontinuously applied (for example, by electrodeposition) to the laminations and the back and side surfaces of the return path but not under the winding area. The conductive coating sustains a reactive field, generated by induced EMF and eddy current, which opposes the undesired field responsible for feedthrough. Leakage is reduced and the reactive field is concentrated because the conductive material is placed in intimate contact with the laminations by plating.

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