Electromagnetic sensor and memory device

Details Electromagnetic sensor and memory device Electromagnetic sensor and memory device

1975-12-22

1978-07-25

Moffitt, James W.

Static information storage and retrieval

Read only systems

Magnetic

G11C 1702

Patent

active

041033400

ABSTRACT:
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.

REFERENCES:
patent: 3080549 (1963-03-01), Rubens
patent: 3375503 (1968-03-01), Bertelsen
patent: 3566373 (1971-02-01), Shackell

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