Patent ID: 7012424

Claim:
A magnetic material detecting apparatus for detecting a magnetic material contained in a medium to be detected, comprising: a pair of cores, each of which has a first end portion, a second end portion opposite to the first end portion, and an intermediate portion between the first and second end portions, the respective first end portions of the cores being opposed to each other across a gap with a transfer path for the passage of the medium to be detected therebetween; a first coil including coils which are wound individually on the respective first end portions of the cores and connected in series with each other; a second coil including coils which are wound individually on the respective second end portions of the cores and connected in series with each other; a third coil including coils which are wound individually on the respective intermediate portions of the cores and connected in series with each other; and a signal processing circuit which AC-energizes the third coil to process a detection signal from the first coil and a detection signal from the second coil.