Lens position detecting circuit and method
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United States of America Patent
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Jul 12, 2016
Grant Date -
Aug 7, 2014
app pub date -
Apr 10, 2014
filing date -
Dec 13, 2011
priority date (Note) -
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Abstract
A position of a lens is detected by detecting, using a phototransistor, light that is emitted from a photodiode and that varies depending on lens position. A control unit divides a moving range of the lens into a plurality of areas, approximates a relationship between lens positions and current of the phototransistor for each of the areas, corrects a current of the phototransistor using the approximated relationship so as to obtain a corrected detection current having a linear relationship with respect to lens positions, and detects the position of the lens using the obtained corrected detection current.
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