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US 12,674,690 B2Granted
Magnetic sensor and magnetic sensor system
AssigneeTDK Corporation
InventorKazuya Watanabe
Life of this patent
Estimating the term…
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.
Claims16
A magnetic sensor comprising:
- a support member having at least one inclined surface inclined relative to a reference plane;
- 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, the first detection signal having a first amplitude with a maximum value and a minimum value;
- 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, the second detection signal having a second amplitude with a maximum value and a minimum value;
- and
- a conversion section,
- wherein the maximum value and the minimum value of the first detection signal are equal to the maximum value and the minimum value of the second detection signal, and
- the conversion section is 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 being configured to change at least either one of the first amplitude of the first detection signal and the second amplitude of the second detection signal to make a ratio of a second corrected amplitude of the second corrected signal to a first corrected amplitude of the first corrected signal different from a ratio of the second amplitude of the second detection signal to the first amplitude of the first detection signal, the first corrected amplitude being a half of a difference between a maximum value and a minimum value of the first corrected signal, the second corrected amplitude being a half of a difference between a maximum value and a minimum value of the second corrected signal.
4 more elements
A magnetic sensor comprising:
- a support member having at least one inclined surface inclined relative to a reference plane;
- 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, the first detection signal having a first amplitude that is a half of a difference between a maximum value and a minimum value of a waveform of the first detection signal if a direction of the target magnetic field changes with a predetermined period;
- 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, the second detection signal having a second amplitude that is a half of a difference between a maximum value and a minimum value of a waveform of the second detection signal if the direction of the target magnetic field changes with a predetermined period;
- 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 being configured to change at least either one of the first amplitude of the first detection signal and the second amplitude of the second detection signal to make a ratio of a second corrected amplitude of the second corrected signal to a first corrected amplitude of the first corrected signal different from a ratio of the second amplitude of the second detection signal to the first amplitude of the first detection signal, the first corrected amplitude being a half of a difference between a maximum value and a minimum value of a waveform of the first corrected signal if the direction of the target magnetic field changes with a predetermined period, the second corrected amplitude being a half of a difference between a maximum value and a minimum value of a waveform of the second corrected signal if the direction of the target magnetic field changes with a predetermined period.
2 more elements
Dependencies are inferred from the claim text.