| 摘要 |
<p>PURPOSE:To sharply reduce the cost of the title system by providing a resonance coil and capacitor connected in parallel with the coil in a code carrier and causing the carrier to have a peculiar resonance frequency. CONSTITUTION:Goods are respectively fitted with code carriers 1, each of which is composed of a coil L1 and capacitor Co and has a peculiar resonance frequency. In addition, the period T1 of a trigger signal obtained at a flip flop 15 is made to correspond to the resonance frequency. Therefore, the code carrier, namely, the goods fitted with the code carrier can be identified when the period of the trigger signal is measured by means of a counter circuit 5 and reference clock circuit 6. When this system is used, the identification code can be changed arbitrarily by means of the resonance frequency of the code carrier and the cost can be reduced sharply.</p> |
