Position detecting apparatus using magneto-resistance effect element
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United States of America Patent
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Jul 4, 1995
Issued Date -
N/A
app pub date -
Jul 26, 1994
filing date -
Feb 7, 1992
priority date (Note) -
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Abstract
A position detecting apparatus comprising a magnet secured to a movable body (lens holder) which is movable along a shaft body when the shaft body is inserted, the magnet having polarity which is alternately magnetized at a predetermined interval, and a magneto-resistance effect element which is positioned and fixed so as to be confronted to the magnet at a predetermined gap interval by an MR holder with the shaft body being used as a securing position reference, and the magneto-resistance effect element serving to obtain a position detection signal for the movable body through variation of a resistance value thereof which is caused by magnetic field of the magnet through movement of the movable body.
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