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Magnetic Head

IP.com Disclosure Number: IPCOM000098115D
Original Publication Date: 1960-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Schaffert, RM: AUTHOR

Abstract

A method of making a magnetic head 1 consists of plating a winding 2 directly onto a magnetic core 3 without an insulating layer between. This method is particularly adaptable to fabricating miniature heads. The resistivity of a copper winding is small compared with that of the core material. Therefore, a greater portion of the current supplied to a plated copper winding will pass through the winding even without insulation.

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Magnetic Head

A method of making a magnetic head 1 consists of plating a winding 2 directly onto a magnetic core 3 without an insulating layer between. This method is particularly adaptable to fabricating miniature heads. The resistivity of a copper winding is small compared with that of the core material. Therefore, a greater portion of the current supplied to a plated copper winding will pass through the winding even without insulation.

The current pulses for energizing the head 1 may be of very short duration and the current flow is restricted to an extremely thin outer layer of the winding.

One method of applying a winding 2 to the core 3 is to wind a waxed string helically around the core to give the desired number of turns. The waxed string acts as a resist pattern when the winding is applied, for example, by electroplating. After plating, the string is removed leaving in unplated helical strip
4. Leads 5 may be soldered to the winding 2.

Energizing of the head by pulsing means such as a transformer core 6, having a primary winding 7 and a secondary winding 8, creates flux lines 9. Addition of a ring 10 of highly permeable magnetic material such as epoxy resin interspersed with iron oxide particles will reduce the reluctance of the flux return path. A permeable element 11 aids in magnetizing materials placed between the core and the element 11.

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