Patent ID: 7071685

Claim:
A banknote validator comprising a banknote evaluation channel, a transport arrangement for moving a banknote through said evaluation channel, at least one induction sensor placed in one side of said evaluation channel for sensing changes of the magnetic and inductive properties of a banknote as it is moved past said at least one induction sensor; wherein each induction sensor comprises a multi layered printed circuit and a sensing element, said printed circuit including a first layer having a primary coil thereon and a second layer having a secondary coil thereon, said primary coil being located in overlapping relation with said secondary coil to induce a responsive current in said secondary coil, said sensing element being electrically connected with said secondary coil to form a closed loop therewith, said sensing element concentrating the responsive current of said secondary coil and rendering the sensing element responsive to changes in inductance and conductivity caused by changes in magnetic or inductive properties of a banknote as it is moved past said sensing element.