Rotational angle detecting sensor having a plurality of magnetoresistive elements located in a uniform magnetic field
First Claim
1. A sensor for detecting a rotational angle of a rotating shaft comprising:
- a substrate having a planar surface, said substrate being mounted on a base plate with the planar surface of said substrate facing a magneto member, a clearance provided between said base plate and tip ends of opposite facing sides of said magneto member, said clearance being smaller than a thickness of said substrate;
a detecting element including a plurality of blocks of magnetoresistance element deposited on the planar surface of said substrate; and
said magneto member having a pair of magneto poles facing each side end of said substrate respectively and providing a magnetic field covering at least the planar surface of said substrate, said magneto member being substantially C-shaped so as to provide said opposite facing sides, said magnetic field provided between said opposite facing sides in which said substrate is positioned, the planar surface of said substrate positioned in parallel with the direction of magnetic flux of said magnetic field, the opposite facing sides of said magneto member for providing said magnetic field therebetween being greater than said substrate;
wherein one of said detecting element and said magneto member is mounted on said rotating shaft, and the other thereof is disposed at a certain position relative to said rotating shaft.
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Accused Products
Abstract
The invention is directed to an arrangement for detecting a rotational angle of a rotating shaft by a sensor. The sensor includes a substrate and a detecting element which has a plurality of blocks of magnetoresistance element deposited on a planar surface of the substrate. The sensor also includes a magneto member which has a pair of magnetic poles facing each side end of the substrate respectively and providing a magnetic field covering at least the planar surface of the substrate. The sensor is so arranged that one of the detecting element and the magneto member is mounted on the rotating shaft, and the other is disposed at a certain position relative to the rotating shaft. Accordingly, the blocks of magnetoresistance element are disposed always in a uniform magnetic field, so that the rotational angle is detected accurately.
117 Citations
8 Claims
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1. A sensor for detecting a rotational angle of a rotating shaft comprising:
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a substrate having a planar surface, said substrate being mounted on a base plate with the planar surface of said substrate facing a magneto member, a clearance provided between said base plate and tip ends of opposite facing sides of said magneto member, said clearance being smaller than a thickness of said substrate; a detecting element including a plurality of blocks of magnetoresistance element deposited on the planar surface of said substrate; and said magneto member having a pair of magneto poles facing each side end of said substrate respectively and providing a magnetic field covering at least the planar surface of said substrate, said magneto member being substantially C-shaped so as to provide said opposite facing sides, said magnetic field provided between said opposite facing sides in which said substrate is positioned, the planar surface of said substrate positioned in parallel with the direction of magnetic flux of said magnetic field, the opposite facing sides of said magneto member for providing said magnetic field therebetween being greater than said substrate; wherein one of said detecting element and said magneto member is mounted on said rotating shaft, and the other thereof is disposed at a certain position relative to said rotating shaft.
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2. A sensor for detecting a rotational angle of a rotating shaft comprising:
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a substrate having a planar surface; a detecting element including a plurality of blocks of magnetoresistance element deposited on the planar surface of said substrate, said blocks of magnetoresistance element forming a bridge circuit; a magneto member having a pair of magnetic poles facing each side end of said substrate respectively and providing a magnetic field covering at least the planar surface of said substrate, one of said detecting element and said magneto member being mounted on said rotating shaft, and the other thereof being disposed at a certain position relative to said rotating shaft; a constant-current circuit for feeding a constant-current to said bridge circuit of said detecting element; and a temperature compensating resistance element comprises two blocks of magnetoresistance element of the same material as said magnetoresistance element of said detecting element disposed in the vicinity thereof, said temperature compensating resistance element adjusting a current fed to said constant-current circuit in response to a change in ohmic value of said temperature compensating resistance element varying in dependence on a change in ambient temperature thereof, the magnetoresistance element having a plurality of elongated sections arranged in parallel with and connected to each other respectively, and wherein the elongated sections of said blocks are arranged perpendicularly to each other. - View Dependent Claims (3, 4, 5)
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6. A sensor for detecting a rotational angle of a rotating shaft comprising:
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a substrate having a planar surface; a detecting element including four blocks of magnetoresistance element formed into a first pattern and deposited on the planar surface of said substrate, each block thereof having a plurality of elongated sections arranged in parallel with and connected to each other, and the elongated sections of the block next to each other of said blocks being arranged perpendicularly to each other, and wherein said detecting element further includes two blocks of magnetoresistance element formed into a second pattern, each block thereof having a plurality of elongated sections arranged in parallel with and connected to each other, the elongated sections of each of said two blocks being arranged perpendicularly to each other, and said elongated sections in said second pattern being deflected from said elongated sections of said first pattern; and a magneto member having a pair of magnetic poles facing each side end of said substrate respectively and providing a magnetic field covering at least the planar surface of said substrate; wherein one of said detecting element and said magneto member is mounted on said rotating shaft, and the other thereof is disposed at a certain position relative to said rotating shaft, and wherein said blocks of magnetoresistance element of said detecting element have a plurality of elongated sections arranged in parallel with and connected to each other respectively, with said elongated sections deflected by said magnetic field provided by said magneto member at an initial position thereof. - View Dependent Claims (7, 8)
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Specification