Magnetic position sensor
First Claim
1. A magnetic position sensor, in particular for a belt buckle (1) for occupant protection in a motor vehicle, having a magnetic field sensor (17) and a first magnet (16) which can be moved from a first position to a second position, with the first position being arranged away from the magnetic field sensor (17) and the second position being located in the immediate vicinity of the magnetic field sensor (17), characterized in that the magnetic field which is produced by the first magnet (16) in its first position has no effective influence on the magnetic field sensor (17), and in that a second magnet (18) is formed, whose magnetic field differs significantly from that of the first magnet (16), and in that the second magnet (18) is arranged in the immediate vicinity of the magnetic field sensor (17) at least when the first magnet (16) is in its first position, with the second magnet (18) applying a defined magnetic field to the magnetic field sensor (17) which is superimposed to a sufficient extent on the interference external magnetic fields (19).
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Accused Products
Abstract
The subject matter of the invention is a magnetic position sensor, in particular for a belt buckle for occupant protection in a motor vehicle, having a magnetic field sensor and a first magnet which can be moved from a first position to a second position, with the first position being arranged away from the magnetic field sensor and the second position being located in the immediate vicinity of the magnetic field sensor.
In order to specify a magnetic position sensor which operates reliably despite an external magnetic interference field, the magnetic field which is produced by the first magnet in its first position has no effective influence on the magnetic field sensor, and a second magnet is formed whose magnetic field differs significantly from that of the first magnet, and the second magnet is arranged in the immediate vicinity of the magnetic field sensor at least when the first magnet is located in its first position, with the second magnet applying a defined magnetic field to the magnetic field sensor, which is superimposed to a sufficient extent on the interference external magnetic fields.
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Citations
8 Claims
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1. A magnetic position sensor, in particular for a belt buckle (1) for occupant protection in a motor vehicle, having a magnetic field sensor (17) and a first magnet (16) which can be moved from a first position to a second position, with the first position being arranged away from the magnetic field sensor (17) and the second position being located in the immediate vicinity of the magnetic field sensor (17),
characterized in that the magnetic field which is produced by the first magnet (16) in its first position has no effective influence on the magnetic field sensor (17), and in that a second magnet (18) is formed, whose magnetic field differs significantly from that of the first magnet (16), and in that the second magnet (18) is arranged in the immediate vicinity of the magnetic field sensor (17) at least when the first magnet (16) is in its first position, with the second magnet (18) applying a defined magnetic field to the magnetic field sensor (17) which is superimposed to a sufficient extent on the interference external magnetic fields (19).
Specification