Magnetic position detecting apparatus having a plurality of magnetic resistance circuits arranged in a comblike shape
A magnetic position detecting apparatus of the present invention includes a first magnetic resistance circuit and a second magnetic resistance circuit each having multiple magnetic resistance elements arranged to be opposite to a magnetized surface, wherein the first and the second magnetic resistance circuits are arranged in such a way that the resistance elements of the first and the second magnetic resistance circuits are connected to one another in series and arranged in a comblike shape to be parallel to one another along a current path of each magnetic resistance element, the magnetic resistance elements of the second magnetic resistance circuit are placed between the magnetic resistance elements of the first magnetic resistance circuit.
1. A magnetic position detecting apparatus comprising:
a first magnetic resistance circuit and a second magnetic resistance circuit, each of the first and second magnetic resistance circuits having multiple magnetic resistance elements arranged to be opposite to a magnetized surface where different magnetic poles are alternatively provided, and each of the first and second magnetic resistance circuits being operable to output current according to a magnetic field strength of the magnetized surface;
a power supply terminal;
a first output terminal provided in the first magnetic resistance circuit; and
a second output terminal provided in the second magnetic resistance circuit;
wherein the first and the second magnetic resistance circuits are arranged such that the magnetic resistance elements of each of the first and the second magnetic resistance circuits are connected to one another in series and are arranged in a comblike shape so as to be parallel to one another along a current path of each of the magnetic resistance elements,
wherein the magnetic resistance elements of at least one of the first magnetic resistance circuit or the second magnetic resistance circuit include a reference magnetic resistance element and correction magnetic resistance elements,
wherein the correction magnetic resistance elements include an even harmonic correction magnetic resistance element that is shifted by (λ/n) from the reference magnetic resistance element, and an odd harmonic correction magnetic resistance element that is shifted by (λ/2m) from the reference magnetic resistance element,
wherein λ is a width of a magnetic pole in an array direction of magnetic poles on the magnetized surface,
wherein “n” is an even number except 0, and
wherein “m” is an odd number except 1.
2. The magnetic position detecting apparatus according to claim 1 , wherein a phase difference between output waveforms of the first magnetic resistance circuit and the second magnetic resistance circuit is shifted by 90°.
3. The magnetic position detecting apparatus according to claim 1 , wherein a portion for connecting the respective magnetic resistance elements in series is formed of a conductive material.
4. The magnetic position detecting apparatus according to claim 1 , wherein at least some of the magnetic resistance elements of the second magnetic resistance circuit are placed between the magnetic resistance elements of the first magnetic resistance circuit.