Position detecting device using reflection type photosensor
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United States of America Patent
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Oct 20, 2015
Grant Date -
Sep 18, 2014
app pub date -
Feb 6, 2014
filing date -
Mar 12, 2013
priority date (Note) -
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Abstract
A position detecting device using a reflection type photosensor, comprising a reflector fitted to a moving target and having reflecting portions and non-reflecting portions arranged alternately in a moving direction of the moving target, a reflection type photosensor having a light emitting element and a light receiving element with plural light receiving portions, and an operation unit for calculating a value indicating the position of the moving target. The light receiving element comprises the first and second light receiving portions outputting signals having different phases, the second light receiving portion is divided into two regions provided at far and near sides from the light emitting element about the first light receiving portion, and the operation unit calculates the value using the one signal calculated from the output signals from the two regions and the output signal from the first light receiving portion.
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