Downsized sensor unit with increased accuracy
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United States of America Patent
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Dec 7, 2004
Grant Date -
Oct 10, 2002
app pub date -
Mar 21, 2002
filing date -
Apr 9, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A sensor unit includes a support body having a concave surface, a spherical body formed of a magnetic material and placed on the concave surface of the support body so as to roll freely thereon, a permanent magnet producing a magnetic field affecting the magnetic spherical body, and a magnetic sensor detecting a change in the magnetic field caused by the movement of said magnetic spherical body. The magnetic spherical body and the permanent magnet are provided to oppose each other with a given distance therebetween in a vertical direction. The magnetic sensor is provided between the magnetic spherical body and the permanent magnet. An output is produced in accordance with the detection by the magnetic sensor.
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