Focus detection apparatus and method
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United States of America Patent
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Sep 27, 2016
Grant Date -
Oct 1, 2015
app pub date -
Mar 26, 2015
filing date -
Mar 28, 2014
priority date (Note) -
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Abstract
A focus detection apparatus comprises: a sensor unit, having a plurality of photoelectric conversion elements for receiving light that passed through an imaging optical system and accumulating charge, configured to generate an image signal to be used for correlation calculation for focus detection based on the accumulated charge; a control unit configured to control the photoelectric conversion elements to stop charge accumulation in a case where a first signal that represents contrast of the image signal reaches a predetermined voltage level; and a voltage level setting unit. The voltage level setting unit sets a larger voltage level in a first case, in which luminance change in a direction of the correlation calculation in the plurality of the photoelectric conversion elements is gentler than a second case, than in the second case.
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