Patent ID: 7620312
Filing Date: 2009-11-17
Classification: G02B,H04N

Abstract:
1. A focus detection apparatus comprising: an image sensor that applies photoelectric conversion to incident light and accumulates charge; a first output unit that outputs an electric signal based on the charge accumulated in said image sensor through a plurality of channels; a second output unit that outputs first information to the plurality of channels; a focus detection unit that detects a phase difference on the basis of electric signals outputted from the plurality of channels; and a plurality of A/D converters that respectively correspond to the plurality of channels, wherein said focus detection unit comprises a correction unit that corrects, on the basis of second information obtained by A/D converting the first information respectively by said plurality of A/D converters, A/D converted electric signals outputted from the plurality of channels and converted by said plurality of A/D converters and detects a phase difference by using the electric signals corrected by said correction unit.