| 摘要 |
<p>PURPOSE:To enhance security without changing manufacturing cost to much by successively laminating a random pattern layer and/or many kinds of pattern layers equivalent thereto, a magnetic recording layer, a concealing layer and a protective layer to a card substrate. CONSTITUTION:In a magnetic recording card 1, a random pattern layer 2 composed of a soft material having coercive force of 400e or less or many kinds of pattern layers equivalent thereto is provided on a substrate 3 and a magnetic recording layer 4, a concealing ink layer 5 and a protective layer 6 are laminated. A reading means consists of a bias DC current supply 7, an inherent data reading magnetic head 8 and an amplifier 9 and inherent data is read to obtain an inherent data reading waveform. This analogue waveform is converted to encoded data by an A/D converter to be stored in magnetic encoded data as the inherent data of the card.</p> |
