Magnetic material detecting apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsMasao Obama, Seiichi Hashiya
Life of this patent
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Abstract
A pair of cores is arranged so that their respective first end portions are opposed to each other across a given gap with a transfer path (M) for the passage of a medium between them. Coils wound individually on the respective first end portions of the cores are connected in series with each other to form a first coil. Coils 5a and 5b wound individually on second end portions of the cores are connected in series with each other to form a second coil. Coils wound individually on respective intermediate portions of the cores are connected in series with each other to form a third coil. A signal processing circuit is provided for AC-energizing the third coil to process a detection signal from the first coil and a detection signal from the second coil.
Claims13
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.
A magnetic material detecting apparatus for detecting a magnetic material contained in a medium to be detected, comprising:
- a plurality of sensing elements arranged side by side;
- and
- magnetic covers of a magnetic material which individually surround at least parts of the sensing elements exclusive of a transfer path along which the medium to be detected is conveyed;
- each of the sensing elements including:
- 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,
- the sensing elements being arranged side by side so that lines connecting the respective first end portions of the paired cores of the sensing elements are parallel to one another.
A magnetic material detecting apparatus for detecting a magnetic material contained in a medium to be detected, comprising:
- a pair of platelike cores each having a pair of long side portions opposite to each other, an intermediate portion situated between the long side portions, a plurality of first protrusions arranged spaced from one another on one of the long side portions, and a plurality of second protrusions arranged spaced from one another on the other long side portion, the paired cores being arranged so that the first protrusions of one of the cores and the first protrusions of the other core are opposed to one another across a given gap with a transfer path for the passage of the medium to be detected therebetween;
- a plurality of first coils each including a plurality of coils which are wound individually on the opposite first protrusions of each set on the paired cores and connected in series for each set;
- a plurality of second coils each including a plurality of coils which are wound individually on the second protrusions of each set on the paired cores and connected in series for each set;
- a third coil including two coils which are wound individually on the respective intermediate portions of the paired cores;
- a pair of magnetic covers of a magnetic material which individually surround the respective second-protrusion-side long side portions of the cores;
- and
- a signal processing circuit which AC-energizes the third coil to process a plurality of detection signals from the first coils and a plurality of detection signals from the second coils.
Dependencies are inferred from the claim text.