Magnetic sensor
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United States of America Patent
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Apr 27, 2010
Grant Date -
Aug 30, 2007
app pub date -
Jul 12, 2006
filing date -
Feb 15, 2006
priority date (Note) -
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Abstract
The magnetic sensor in the invention is arranged to detect a change of magnetic field caused by a movement of the magnetic movable by a magnetic sensor element arranged with a gap to the magnetic movable, to convert the detected change of magnetic field by first and second bridge circuits into electric signals, to generate first and second rectangular-wave signals by first and second comparator circuits depending upon the electric signals, and to form a signal having at least four levels by a signal forming circuit, thereby detecting a moving direction of the magnetic movable depending upon a level-change order in the signal. This makes it possible to detect a rotating direction of the magnetic movable rapidly and correctly.
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