MAGNETIC POSITION DETECTION DEVICE
First Claim
1. A magnetic position detection device comprising:
- a bias magnet producing a bias magnetic field;
an object magnet producing an object magnetic field; and
a magnetic detection element detecting direction of an applied magnetic field applied to the magnetic detection element, whereinmovement of the object magnet relative to the bias magnet changes magnetic field direction the applied magnetic field that is applied to the magnetic detection element, and,when the bias magnet and the object magnet come closest to each other, the object magnetic field produced by the object magnet is larger than the bias magnetic field produced by the bias magnet at the magnetic detection element.
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Accused Products
Abstract
A magnetic position detection device that can detect position even if there is only one object magnet. A magnetic position detection device includes a bias magnet, a magnetic detection element, an object magnet, and a mobile object. Opposite poles of the bias magnet and of the object magnet face each other. The magnetic detection element is disposed between pole surfaces of the bias magnet and of the object magnet. The magnetic detection element is fixed to the bias magnet and has a fixed positional relationship to the bias magnet. The orientation of the magnetic field at the magnetic detection element changes in accordance with the position of the object magnet. The magnetic detection element detects the orientation of the magnetic field applied to the magnetic detection element.
9 Citations
15 Claims
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1. A magnetic position detection device comprising:
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a bias magnet producing a bias magnetic field; an object magnet producing an object magnetic field; and a magnetic detection element detecting direction of an applied magnetic field applied to the magnetic detection element, wherein movement of the object magnet relative to the bias magnet changes magnetic field direction the applied magnetic field that is applied to the magnetic detection element, and, when the bias magnet and the object magnet come closest to each other, the object magnetic field produced by the object magnet is larger than the bias magnetic field produced by the bias magnet at the magnetic detection element. - View Dependent Claims (2, 3, 4, 5, 6, 9, 10, 11)
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7. A magnetic position detection device comprising:
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a bias magnet; an object magnet facing the bias magnet such that different magnetic poles of the bias magnet and of the object magnet face each other; and a magnetic detection element detecting direction of an applied magnetic field that is applied to the magnetic detection element, wherein movement of the object magnet relative to the bias magnet changes magnetic field direction of the applied magnetic field that is applied to at the magnetic detection element. - View Dependent Claims (8, 13, 14, 15)
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12. A magnetic position detection device comprising:
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a bias magnet; a soft magnetic body; and a magnetic detection element detecting direction of an applied magnetic field that is applied to the magnetic detection element, wherein movement of the soft magnetic body relative to the bias magnet changes magnetic field direction of the applied magnetic field that is applied to the magnetic detection element, and position of the soft magnetic body relative to the bias magnet is uniquely identifiable.
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Specification