POSITION DETECTION DEVICE
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United States of America Patent
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Issued Date -
Jan 22, 2015
app pub date -
Jul 16, 2014
filing date -
Jul 16, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A detection unit is disposed at a position facing a first magnet with a spacer member interposed therebetween, the first magnet is disposed between the spacer member and a second magnet so that a polarity of the first magnet corresponds to a polarity of the second magnet opposite to the polarity of the first magnet, a magnetic force generated from the second magnet reaches a position distant from the detection unit in a space to be detected as compared to a magnetic force generated from the first magnet, a magnetic field is generated by composition of the magnetic force generated from the first magnet and the magnetic force generated from the second magnet, and the detection unit detects the approach of an object to be detected by detecting a change of a magnetic field that occurs when an influence of the magnetic force generated from the second magnet is changed.
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