Magnetic quality discrimination device and magnetic quality discrimination method

摘要

A magnetic quality discriminating device that detects and discriminates the magnetic quality of a magnetic substance contained in a paper sheet transported on a transport path, and transports a bias magnetic field whose magnetic field direction is a direction that forms a predetermined angle with the transport surface of the paper sheet. A magnetic detection unit that is generated on the road and detects the magnetic quantity of the magnetic material by a change in the bias magnetic field, and is arranged upstream of the magnetic detection unit in the transport direction, and a direction different from the magnetic field direction of the bias magnetic field is defined as the magnetic field direction. A magnetizing unit that generates a magnetizing magnetic field on the conveyance path and magnetizes the magnetic body. At the magnetic detection position by the magnetic detection unit, each magnetic body is made to respond to the coercive force by the magnetizing magnetic field and the bias magnetic field. Magnetize in different magnetization directions.