Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

G - Physics

11

B

352/57

G11B 5/80 (2006.01) G06K 19/00 (2006.01) G06K 19/06 (2006.01) G06K 19/08 (2006.01) G06K 19/12 (2006.01) G11B 5/02 (2006.01) G11B 5/70 (2006.01) G11B 5/706 (2006.01)

Patent

CA 1326906

ABSTRACT OF THE DISCLOSURE: In a magnetic recording medium, three sorts or more of magnetic patterns being different in the coercive force are combined corresponding to information, and the magnetic pattern with high coercive force is previously magnetized in required direction and the magnetization direction provides a part of the information. In this constitution, the codes for discriminating truth or falsehood of the card cannot be easily deciphered by a magnetic viewer on the market thereby the security can be improved.

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