Position detecting device
First Claim
Patent Images
1. A position detecting device comprising:
- a magnet that has a first magnetic pole and a second magnetic pole;
a magnetic sensor that detects a change in magnetic flux generated by a detection target which enters between the magnet and the magnetic sensor on the first magnetic pole side of the magnet;
a magnetic shield that shields a disturbing magnetic field and that includes a magnetic material which is disposed on the second magnetic pole side of the magnet; and
a housing that contains the magnet, the magnetic sensor, and the magnetic shield,wherein the magnetic shield includes a first shielding wall which spreads in a direction intersecting a direction of a magnetization axis connecting the first magnetic pole and the second magnetic pole, and a second shielding wall which extends from the first shielding wall in the direction parallel to the magnetization axis so as to be arranged on a side of the magnet,wherein the magnetic shield is arranged in the housing so there is a first magnetic gap between the magnet and the first shielding wall and a second magnetic gap between the magnet and the second shielding wall, andwherein the magnet, the magnetic sensor, and the magnetic shield are integrally formed in the housing with resin.
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Abstract
A position detecting device includes: a magnet that has a first magnetic pole and a second magnetic pole; a magnetic sensor that detects a change in magnetic flux generated by a detection target which enters between the magnet and the magnetic sensor on the first magnetic pole side of the magnet; and a magnetic shield that has a magnetic gap between the magnet and the magnetic shield, and that includes a magnetic material which is disposed on the second magnetic pole side of the magnet.
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Citations
9 Claims
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1. A position detecting device comprising:
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a magnet that has a first magnetic pole and a second magnetic pole; a magnetic sensor that detects a change in magnetic flux generated by a detection target which enters between the magnet and the magnetic sensor on the first magnetic pole side of the magnet; a magnetic shield that shields a disturbing magnetic field and that includes a magnetic material which is disposed on the second magnetic pole side of the magnet; and a housing that contains the magnet, the magnetic sensor, and the magnetic shield, wherein the magnetic shield includes a first shielding wall which spreads in a direction intersecting a direction of a magnetization axis connecting the first magnetic pole and the second magnetic pole, and a second shielding wall which extends from the first shielding wall in the direction parallel to the magnetization axis so as to be arranged on a side of the magnet, wherein the magnetic shield is arranged in the housing so there is a first magnetic gap between the magnet and the first shielding wall and a second magnetic gap between the magnet and the second shielding wall, and wherein the magnet, the magnetic sensor, and the magnetic shield are integrally formed in the housing with resin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification