Coin discrimination apparatus

摘要

A coin discrimination apparatus discriminates authenticity and a denomination of a coin by oscillation magnetic fields of high and low frequencies in a low frequency band in which generated magnetic fluxes allow a coin to pass therethrough. A first oscillation coil for generating an oscillation magnetic field of a low frequency and a reception coil are arranged at coin contact and coin non-contact surfaces, respectively, of an inclined coin path to face each other. A second oscillation coil is arranged on the coin non-contact surface to be separated from the reception coil by a predetermined distance in a coin rolling direction and generates an oscillation magnetic field of a high frequency. The coin discrimination apparatus includes a first sensor circuit for detecting maximum values of changes in impedances of the oscillation coils and the reception coil upon passage of a coin, a second sensor circuit for detecting the changes in impedances when the changes in impedances of the first and second oscillation coils coincide with each other, and a CPU for discriminating authenticity and the denomination of the coin based on coin physical characteristics in accordance with the detection results from the sensor circuits.