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High Sensitivity Magnetoresistive Sensor for Decoding Magnetic Characters on Checks

IP.com Disclosure Number: IPCOM000064967D
Original Publication Date: 1985-Oct-01
Included in the Prior Art Database: 2005-Feb-19

Publishing Venue

IBM

Related People

Authors:
Wallace, JE Whalen, GW [+details]

Abstract

A magnetoresistive sensor with a very thin sensing element is recessed in a wear-resistant carrier to permit a very low "flying height". It provides a sensor with low magnetic field sensing capability, output voltage independent of scanning speed, and long life. This sensor can be used for decoding magnetic characters on checks, which, due to inherently low magnetic field intensity, present scanning difficulties. Fig. 1 shows the magnetoresistive sensor assembly, with sensor 1, containing sensing element 2, mounted in carrier 3. Sensing element 2 is approximately 100 angstroms thick. Sensor 1 is recessed above surface 4 of carrier 3 by approximately 100 microinches, shown at 5.