Position detector, seat belt retractor having this position detector, and seat belt apparatus having this seat belt retractor
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United States of America Patent
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May 10, 2016
Issued Date -
N/A
app pub date -
May 13, 2011
filing date -
May 17, 2010
priority date (Note) -
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Abstract
A position detector is provided that can detect the position of a moving member with a higher degree of accuracy. In one form, a rotation sensor includes a magnet in which N-pole magnets and S-pole magnets are arranged alternately and circularly and that rotates in conjunction with the rotation of a spool, and first and second Hall elements and that are disposed apart from each other in the circumferential direction of the magnet and detect the poles of the N-pole magnets and S-pole magnets. In that case, the first and second Hall elements and are both unipolar detection type Hall elements that detect only the S-pole. The magnetization width of the S-pole magnets is set large, and the magnetization width of the N-pole magnets is set small.
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