Value/use control and identification system for magnetic cards

Details Value/use control and identification system for magnetic cards Value/use control and identification system for magnetic cards

G - Physics

06

K

352/53.4

G06K 7/08 (2006.01) G11B 5/02 (2006.01)

Patent

CA 1049141

ABSTRACT OF THE DISCLOSURE This invention relates to systems for reading and changing codes of spot magnetized cards. Spot magnetized cards have been described where- in polarities of magnetized spots on the card are to be removed with each use to represent a lower value. However, available systems using such cards are not able to identify the card with particular apparatus to be actuated thereby. The present invention provides a system for cooperably relating both identification and value/use codes in the same card so that normal operations of associated control circuits are mutual prerequisites for actuating end use apparatus and changing the value/use code, or where- in the value of a card can be verified without effecting operations of either the end use apparatus of the code changing means. According to the invention, a card is spot magnetized with a value or use code, in which the polarities of the spots at one card surface are distributed in accordance with the Gray code in the described arrangement, and with an identification code. Polarity reversing electromagnets with bifilar windings are arranged so that respective spots of the Gray code are aligned therewith. Electro- magnet sensors with which each spot of each code are aligned are utilized via logic circuits to cause a clock generator to produce pulses for use in operating end use apparatus and for selectively energizing an electromagnet winding in a direction that reverses the associated spot to establish a decremented value/use code.

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