Magnetic property determination apparatus and magnetic property determination method
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United States of America Patent
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Feb 6, 2018
Grant Date -
Sep 22, 2016
app pub date -
Apr 9, 2014
filing date -
Apr 9, 2013
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Abstract
A magnetic property determination apparatus that detects a magnetic property of each magnetic material included in a paper sheet transported through a transport path and determines the magnetic materials. The magnetic property determination apparatus includes a magnetic detection unit that generates on the transport path a bias magnetic field having a magnetic field direction inclined to a transport surface of the paper sheet by a specific angle and detects the magnetic charge of the magnetic materials by detecting variation of the bias magnetic field; and a magnetization unit that is arranged upstream of the magnetic detection unit in the transport direction and magnetizes the magnetic materials by generating on the transport path a magnetization magnetic field having a magnetic field direction oriented in a direction different from the direction of the bias magnetic field. At a position at which the magnetic detection unit detects the magnetism, the magnetic materials are in a state in which the magnetic materials are magnetized in mutually different magnetization directions according to coercive force thereof.
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