Magnetic sensor and magnetic sensor system
AssigneeTDK Corporation
InventorKazuya WATANABE
Life of this patent
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Abstract
A magnetic sensor includes a first MR element disposed on an inclined surface and configured to generate a first detection signal, a second MR element disposed on an inclined surface and configured to generate a second detection signal, and a conversion section configured to convert the first detection signal and the second detection signal into a first corrected signal and a second corrected signal, respectively. The conversion section is configured to change an amplitude of at least either one of the first and second detection signals to make a ratio of the amplitude of the second corrected signal to the amplitude of the first corrected signal different from a ratio of the amplitude of the second detection signal to the amplitude of the first detection signal.
Claims15
A magnetic sensor comprising:
- a support member having at least one inclined surface inclined relative to a reference plane by an angle alpha;
- a first magnetic detection element disposed on the at least one inclined surface and configured to detect a target magnetic field and generate a first detection signal;
- a second magnetic detection element disposed on the at least one inclined surface and configured to detect the target magnetic field and generate a second detection signal having a phase different from that of the first detection signal;
- and
- a conversion processor configured to:
- convert the first detection signal and the second detection signal into a first corrected signal and a second corrected signal, respectively, and
- adjust a ratio of an amplitude of the second corrected signal to an amplitude of the first corrected signal or a ratio of an amplitude of the second detection signal to an amplitude of the first detection signal, by changing at least one of the amplitude of the first detection signal and the amplitude of the second detection signal based on the angle alpha, so that
- (i) the ratio of an amplitude of the second corrected signal to the amplitude of the first corrected signal is different from the ratio of the amplitude of the second detection signal to the amplitude of the first detection signal and
- (ii) the ratio of the amplitude of the second corrected signal to the amplitude of the first corrected signal is a value other than 1.
A magnetic sensor comprising:
- a support member having a surface, the surface having at least one inclined surface inclined relative to a reference plane and an entire shape of the surface being a substantially semi-cylindrical curved surface;
- a first magnetic detection element disposed on the at least one inclined surface and configured to detect a target magnetic field and generate a first detection signal;
- a second magnetic detection element disposed on the at least one inclined surface and configured to detect the target magnetic field and generate a second detection signal having a phase different from that of the first detection signal;
- a converter configured to
- convert the first detection signal and the second detection signal into a first corrected signal and a second corrected signal, respectively, and
- adjust an amplitude relationship between the first detection signal and the second detection signal so that a ratio of an amplitude of the second corrected signal to an amplitude of the first corrected signal is different from a ratio of the amplitude of the second detection signal to the amplitude of the first detection signal;
- and
- an angle that the at least one inclined surface forms with the reference plane is in a range of 10° or more and 45° or less.
Dependencies are inferred from the claim text.