Movement detection unit
AssigneeTDK Corporation
InventorTakakazu Imai
Life of this patent
Estimating the term…
Abstract
A movement detection unit includes a movable body, a first sensor, a second sensor, and a signal processor. The movable body performs a movement in a first direction. The first sensor detects a first magnetic field change which is caused by the movement of the movable body and outputs a first signal. The second sensor is provided in the first direction at a location different from a location of the first sensor. The second sensor detects a second magnetic fled change which is caused by the movement of the movable body and outputting a second signal. The signal processor includes a signal generating circuit that generates a third signal and a fourth signal on a basis of the first signal. The third signal and the fourth signal have waveforms different from each other.
Claims15
A movement detector comprising:
- a movable body that performs a movement in a first direction;
- a first sensor that detects a first magnetic field change which is caused by the movement of the movable body and outputs a first signal;
- a second sensor provided in the first direction at a location different from a location of the first sensor, the second sensor detecting a second magnetic field change which is caused by the movement of the movable body and outputting a second signal;
- and
- a signal processor including a signal generating circuit that generates a third signal and a fourth signal based on the first signal, the third signal and the fourth signal having waveforms different from each other, and compares a voltage of the second signal to voltages of the first, third, and fourth signals.
A movement detector comprising:
- a movable body that performs a movement in a first direction;
- a first sensor that detects a first magnetic field change which is caused by the movement of the movable body and outputs a first signal;
- a second sensor provided in the first direction at a location different from a location of the first sensor, the second sensor detecting a second magnetic field change which is caused by the movement of the movable body and outputting a second signal;
- and
- a signal processor including a signal generating circuit that generates a third signal and a fourth signal based on the first signal, the third signal and the fourth signal having waveforms different from each other, the signal generating circuit including:
- a first comparator that outputs a fifth signal based on a comparison between a voltage of the third signal and a voltage of the second signal;
- a second comparator that outputs a sixth signal based on a comparison between a voltage of the fourth signal and a voltage of the second signal;
- and
- a pulse generator that combines the fifth signal and the sixth signal and thereby generates a seventh signal containing a plurality of pulses.
A movement detector comprising:
- a movable body that performs a movement in a first direction;
- a first sensor that detects a first magnetic field change which is caused by the movement of the movable body and outputs a first signal;
- a second sensor provided in the first direction at a location different from a location of the first sensor, the second sensor detecting a second magnetic field change which is caused by the movement of the movable body and outputting a second signal;
- and
- a signal processor including a signal generating circuit that generates a third signal and a fourth signal based on the first signal, and an eighth signal and a ninth signal based on the second signal, the third signal and the fourth signal having waveforms different from each other, and the eighth signal and the ninth signal having waveforms different from each other, the signal generating circuit including:
- a third comparator that outputs a tenth signal based on a comparison between a voltage of the third signal and a voltage of the eighth signal;
- a fourth comparator that outputs an eleventh signal based on a comparison between a voltage of the fourth signal and a voltage of the ninth signal;
- and
- a pulse generator that combines the tenth signal and the eleventh signal and thereby generates a twelfth signal containing a plurality of pulses.
Dependencies are inferred from the claim text.