Electromagnetic sensor and memory device

Details Electromagnetic sensor and memory device Electromagnetic sensor and memory device

G - Physics

06

K

352/53.4

G06K 7/08 (2006.01)

Patent

CA 1074445

ABSTRACT OF THE DISCLOSURE ELECTROMAGNETIC SENSOR AND MEMORY DEVICE An electromagnetic sensor and memory device for employment with a reader for magnetically encoded cards has a plurality of bit indicators that detect magnetized data bits in such cards. Each bit indicator is formed from a ferromagnetic core magnetizable to either of two opposite stable magnetized states that switch from one stable state to the other upon application of an appropriate magnetizing field. A control element disposed through the core serves to provide the magnetizing field for switching the stable state of the core and also serves as a sensing means for detecting each switch between stable states. In a modified embodiment, bias magnetizing field sources are employed with the bit indicators to provide a variety of bit sensing operations.

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