Imaging lens barrel and method for controlling operation of the same
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United States of America Patent
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Apr 5, 2016
Grant Date -
Jun 11, 2015
app pub date -
Feb 18, 2015
filing date -
Aug 30, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
An imaging lens barrel includes: a barrel body; a rotating body including a first magnetic scale and a second magnetic scale; a magnetic sensor device including a first magnetic sensor and a second magnetic sensor; a phase difference calculation section configured to calculate a phase difference between a first phase signal and a third phase signal; a correction table memory configured to store a correction table storing a correction value for correcting a difference between the phase difference and a design value in association with the phase difference; a phase difference correction section configured to read a correction value corresponding to the phase difference calculated by the phase difference calculation section and to correct the phase difference using the read correction value; and an absolute position calculation section configured to calculate an absolute position of the imaging lens.
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