Browse Prior Art Database

Hall Effect Credit Card Reader

IP.com Disclosure Number: IPCOM000075340D
Original Publication Date: 1971-Sep-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Strnad, RJ: AUTHOR

Abstract

This is a credit card having vertically polarized magnetic tape thereon, and Hall effect devices in the reading circuit.

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Hall Effect Credit Card Reader

This is a credit card having vertically polarized magnetic tape thereon, and Hall effect devices in the reading circuit.

Fig. 1 shows a plastic card, as used in credit cards, for example, with a strip of magnetic tape deposited thereon. the polarization is a typical north-south pattern, as indicated in the exploded view. No play-back read heads are used for sensing the information from the tape. Rather, the sense amplifier includes Hall effect chips and other circuits as illustrated in Fig. 2a. Additional chips for providing digital or analog functions can be mounted on the same substrate. The magnetic tape in the plastic card passes over the sensing circuit as shown in Fig. 2b. An amplifying circuit, such as shown in Fig. 3, is used for amplification of the millivolt-signals provided by the Hall effect chips.

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