| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To configure a card system utilizing a Barkhausen signal. <P>SOLUTION: An arrangement position of a magnetic material 12 on a base material 11 is made to correspond to a bit position, the magnetic material 12 is pasted in a bit position whose data are "1", and a code information recording medium 10 is thus manufactured. A transmission electromagnetic field apparatus 102 including a pair of spiral exciting coils 120_1 and 120_2 facing each other is arranged on a printed circuit board 122. A plurality of reception-side electromagnetic field apparatuses 104 are arranged on front and rear surfaces of a printed circuit board 142 so that the arrangement direction of a loop-like detection coil 140 is oriented at 90 degrees with respect to a magnetic field generated in a detection region by the transmission electromagnetic field apparatus 102. The detection coil 140 detects magnetic pulses generated from the magnetic material 12 when an alternating current is supplied to the exciting coil 120 while the code recording medium 10 is placed on a reading surface. A code information reproduction processor 300 identifies the arrangement position of the magnetic material 12 on the basis of the arrangement position of the detection coil 140 having detected magnetic pulses, and reproduces code information. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
