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US 2019/0195655 A1Published application
Magnetic detection device
AssigneeMitsubishi Electric Corporation
InventorYoshinori TATENUMA
Life of this patent
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Abstract
To obtain a magnetic detection device which can detect a direction of movement of a magnetic moving body immediately right after a reset release of the magnetic detection device. The magnetic detection device includes a signal change detector which detects the peak, bottom, and gradient of an output signal of a first magnetoelectric conversion element group and the peak, bottom, and gradient of an output signal of a second magnetoelectric conversion element group, wherein a direction of movement of a magnetic moving body is detected based on the gradient of increase or decrease of one of the output signal or the output signal at the timing of a detection of the peak or bottom of the other.
Claims9
A magnetic detection device which detects a movement of a magnetic moving body to be detected and which has:
- a first magnetoelectric conversion element group having a magnetoelectric conversion element which is disposed facing the magnetic moving body and disposed arranged in a direction of movement of the magnetic moving body and which outputs a detection signal along with a movement of the magnetic moving body;
- and
- a second magnetoelectric conversion element group having magnetoelectric conversion elements which are disposed facing the magnetic moving body and disposed arranged in a direction of movement of the magnetic moving body and which each output a detection signal along with a movement of the magnetic moving body,
- the first magnetoelectric conversion element group and the second magnetoelectric conversion element group being disposed so that an output signal of one of the two magnetoelectric conversion element groups has a phase difference which may be deemed to be 90 degrees with respect to an output signal of the other, the device comprising:
- a signal change detector which detects the peak and bottom of the output signal and the gradient of increase and decrease of the output signal based on the output signal of the first magnetoelectric conversion element group or on the output signal of the second magnetoelectric conversion element group;
- and
- a movement direction determiner which determines a direction of movement of the magnetic moving body based on the grandient of increase or decrease of the output signal of the other at the timing of the signal change detector' s detection of the peak or bottom of the output signal of one of the first magnetoelectric conversion element group or the second magnetoelectric conversion element group, wherein
- a direction of movement of the magnetic moving body is detected based on an output signal of the movement direction determiner.
5 more elements
A magnetic detection device which detects a movement of a magnetic moving body to be detected and which has:
- a first magnetoelectric conversion element group having a magnetoelectric conversion element which is disposed facing the magnetic moving body and disposed arranged in a direction of movement of the magnetic moving body and which outputs a detection signal along with a movement of the magnetic moving body;
- and
- a second magnetoelectric conversion element group having magnetoelectric conversion elements which are disposed facing the magnetic moving body and disposed arranged in a direction of movement of the magnetic moving body and which each output a detection signal along with a movement of the magnetic moving body,
- the first magnetoelectric conversion element group and the second magnetoelectric conversion element group being disposed so that an output signal of one of the two magnetoelectric conversion element groups has a phase difference which may be deemed to be 90 degrees with respect to an output signal of the other, the device comprising:
- a first amplifier connected to the first magnetoelectric conversion element group;
- a second amplifier connected to the second magnetoelectric conversion element group;
- a signal change detector which detects the peak and bottom of the output signal and the gradient of increase and decrease of the output signal based on the output signal of the first magnetoelectric conversion element group or on the output signal of the second magnetoelectric conversion element group and detects output signal of the first amplifier and the second amplifier;
- a first movement direction determiner which determines a direction of movement of the magnetic moving body based on the gradient of increase or decrease of the output signal of the other at the timing of the signal change detector's detection of the peak or bottom of the output signal of one of the first magnetoelectric conversion element group or the second magnetoelectric conversion element group;
- a first comparator which compares an output signal of the first amplifier with a comparison potential and outputs a first comparison signal;
- a second comparator which compares an output signal of the second amplifier with a comparison potential and outputs a second comparison signal;
- and
- a second movement direction determiner which determines a direction of movement of the magnetic moving body based on a phase difference between the first comparison signal and the second comparison signal, wherein
- a direction of movement of the magnetic moving body is detected based on an output signal of the first movement direction determiner or on an output signal of the second movement direction determiner.
10 more elements
Dependencies are inferred from the claim text.