| 摘要 |
<p>A signal transmitting coil OCL and a signal receiving coil RCL are disposed on the opposite sides of a coil passage and are magnetically coupled with each other. When a coin C passes between these coils, a voltage is induced in the transmitting coil whose voltage level varies depending upon permeability of the coin. The detected voltage is amplified by a plurality of parallel amplifiers having amplification factors determined by the material of the coin. The outputs of the amplifiers are converted into DC voltage and the levels thereof are judged whether they lie between a predetermined high level and a predetermined low level or not so as to produce a coin sorting signal. <IMAGE></p> |
