| 摘要 |
A magnetic recording medium wherein erasing and rewriting of magnetic recording signals are impossible. Magnetic recording signals are written by preparing a magnetic recording layer on a substrate by coating the same with magnetic coating material, writing magnetic signals on the recording layer while it is still in an undried state, and immediately drying the recording layer to thereby fix the magnetic signals. According to the above procedures, the magnetic particles form a pattern composed of coarse and fine particles in the magnetic records and the magnetic recording signals are fixed. In this magnetic recording medium, incorporation of resins such as polyethylene or polypropylene in the magnetic recording layer or provision of a readily melting metal layer between the substrate and the magnetic recording layer enables the breakage of the magnetic recording layer. In this magnetic recording layer, therefore, the magnetic recording layer can be broken and the magnetic recording signals recorded on the magnetic recording layer are fixed, which prevents rewriting of magnetic recording signals irrespectively of whether the magnetic recording layer has been broken or not, thus enabling the prevention of illegal use of magnetic cards.
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