DEVICE FOR AUTHENTICATING COINS, MEDALS, AND OTHER FLAT METAL ITEMS Russian patent published in 2002 - IPC

FIELD: authenticating coins and other flat metal items. SUBSTANCE: device has coin channel with top and bottom side walls; coin moves along channel over bottom wall past at least one inductor-type metering circuit provided with coil S. Coil S may carry first current (l₁) from first current or voltage supply 10 and second current (l₂) from second current or voltage supply 21. Capacitor (C₁) is connected between coil S and first current or voltage supply 19 so that coil S and capacitor (C₁) form circuit with impedance (Z₁).. Phase shift (Φ₁) between first current (I₁) and voltage in circuit with impedance (Z₁) is used as criterion for accepting or declining the coin. EFFECT: enhanced ability of identifying coins by means of simple metering circuit. 10 cl, 4 dwg