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Technique for Magnetic Read Write Head Air Film Measurement

IP.com Disclosure Number: IPCOM000095537D
Original Publication Date: 1964-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Bate, G: AUTHOR [+2]

Abstract

One particular application of the method generally described on Pg. 57 of the IBM Technical Disclosure Bulletin, Vol. 6, No. 3, August 1963, is schematically illustrated.

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Technique for Magnetic Read Write Head Air Film Measurement

One particular application of the method generally described on Pg. 57 of the IBM Technical Disclosure Bulletin, Vol. 6, No. 3, August 1963, is schematically illustrated.

The general method concerns the static measurement of magnetic properties of sample portions of a single recorded track of magnetic tape. This application relates to static tape measurements which are functionally dependent upon the head to tape spacing under dynamic recording conditions. Such measurements can be used to indicate the general accuracy of air film computation theory.

In this application, a dynamic recording of a predetermined signal is made under carefully controlled head spacing conditions, e. g., by inserting predetermined thicknesses of MYLAR* film or coating between the head and tape (A). Samples of the recorded tape track are cut out and their static magnetic properties are carefully measured by means of a sensitive torsion balance magnetometer (B). A plot is thus obtained relating static magnetization to head spacing.

Then, samples of tape records made under dynamic conditions, with a varying air film separating the head and tape, can be statically examined and referenced to the standard plot for an indication of the general spacing accuracy.

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