Contiguously matched magnetic sensor array and magnetic media for authentication of documents and products

摘要

Apparatus for detecting a magnetic pattern having a plurality of spaced magnetic areas includes an array of magnetic sensors which are configured and spaced from each other to detect the spaced magnetic areas of a magnetic pattern brought into contiguity with the array. Electrical circuitry connects the array of magnetic sensors in series and a single source is provided for supplying current to the array of magnetic sensors through the electrical circuitry.