Position detector, and lens apparatus and image pickup apparatus including the position detector
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United States of America Patent
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Jun 12, 2018
Issued Date -
Jan 7, 2016
app pub date -
Jun 30, 2015
filing date -
Jul 3, 2014
priority date (Note) -
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Abstract
A position detector, including: a scale including a pattern array formed cyclically in a movement direction, the scale being provided to a fixed member or a movable member; a detector including detection elements arranged in the movement direction, the detector being provided to the other; a generating unit that selectively generates, from signals received from the detection elements, a first signal obtained by a first combination of the signals or a second signal obtained by a second combination of the signals; an output unit that outputs the first or second signal received from the generating unit; and a switcher that switches over between the first and second signals as a signal to be generated, wherein the first signal changes within a first range, corresponding to a relative position; and the second signal does not change beyond a second range smaller than the first range, corresponding to the relative position.
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