Metal detecting device and metal detecting method
AssigneeSintokogio, Ltd.
InventorsYoshiyasu Makino, Tatsuya Yamada, Hideaki Kaga
Life of this patent
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Abstract
A metal detecting device includes: a transfer section that transfers an inspection target object, along a path that passes between a first magnet and a second magnet; a first magnetic sensor that is arranged so as to be aligned with the first magnet and that outputs a first signal; and a second magnetic sensor that is arranged so as to be aligned with the second magnet and that outputs a second signal, whether or not the inspection target object contains metal being determined on the basis of strength of the first signal and a phase difference between the first signal and the second signal.
Claims13
A metal detecting device comprising:
- a first magnet that generates a magnetic field that is static;
- a second magnet that is arranged so as to face the first magnet and that generates another magnetic field that is static;
- a transfer section that transfers an inspection target object along a path that passes between the first magnet and the second magnet;
- a first magnetic sensor that is arranged so as to be aligned with the first magnet and that outputs a first signal which corresponds to a change in magnetic field;
- a second magnetic sensor that is arranged so as to be aligned with the second magnet or so as to be aligned with the first magnet via the first magnetic sensor and that outputs a second signal which corresponds to a change in magnetic field;
- and
- one or more processors,
- the processors carrying out
- a determination step of determining whether or not the inspection target object contains metal based on a magnitude of strength of the first signal and whether or not a phase of the first signal is opposite to a phase of the second signal.
A metal detecting method comprising steps of:
- controlling, by a processor, a transfer section that transfers an inspection target object along a path passing between a first magnet, which generates a magnetic field that is static, and a second magnet, which is arranged so as to face the first magnet and which generates another magnetic field that is static, so that the inspection target object passes between the first magnet and the second magnet;
- obtaining, by the processor, form a first magnetic sensor, a first signal which corresponds to a change in magnetic field, the first magnetic sensor being arranged so as to be aligned with the first magnet;
- obtaining, the processor, from a second magnetic sensor, a second signal which corresponds to a change in magnetic field, the second magnetic sensor being arranged so as to be aligned with the second magnet or so as to be aligned with the first magnet via the first magnetic sensor;
- determining, by the processor, whether or not the inspection target object contains metal, based on a magnitude of strength of the first signal and whether or not a phase of the first signal is opposite to a phase of the second signal;
- and
- displaying, by the processor, a result of the determining on a display section, and stopping, by the processor, transfer of the inspection target objection after the displaying.
Dependencies are inferred from the claim text.