| 摘要 |
An arrangement for detecting bank notes having magnetic properties, comprising transport means (11) for transporting documents past a magnetic detector (12-14). The object of the invention is to increase the possibility and the reliability of distinguishing bank notes which are not genuine from genuine bank notes and bank notes of a given denomination/kind from bank notes of another denomination/kind. The detector includes a permanent magnet (12) and a magnetic circuit (13) having detector means (14) for detecting changes in the magnetic field through the magnetic circuit (13). The output side of the detecting means (14) is connected to a signal processing means (20) for generating signals in response to the magnetic properties of bank notes transported through the arrangement. The magnetic circuit (13) includes an air gap (131) which is located closely adjacent the bank note transport path (0-0). The magnetic flux of the permanent magnet (12) in the air gap (131) is directed in a plane at right angles to the direction of the transport path (0-0) closely adjacent the air gap. |
