Position detecting apparatus, and lens apparatus, image reading apparatus, and image forming apparatus including the same
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United States of America Patent
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Sep 1, 2015
Grant Date -
Mar 5, 2015
app pub date -
Aug 28, 2014
filing date -
Aug 29, 2013
priority date (Note) -
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Abstract
A position detector, includes: a scale having first and second patterns having respective first and second period; a detector array including elements each detecting energy intensities based on the patterns; a generator configured to generate first and second signals having phases different from each other obtained based on the patterns respectively; and a deriver deriving a position of the array relative to the scale based on the signals, wherein the scale is movable relative to the array; the deriver derives a reference position as a detection element array position relative to the scale based on the signals, performs a first process to derive a array position relative to the scale by a array displacement relative to the reference position is derived based on the first signals, and performs a second process in which a relative array position is derived based on the position derived by the first process.
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