Imaging device and focus detecting method

A focus detecting method comprising the steps of:

• exposing an image pickup device having an arrangement of photoelectric converting units, the arrangement in which a plurality of pairs of photoelectric converting units are arranged along a predetermined direction, each pair of photoelectric converting units receiving light beams of a subject passing through partial areas in a pair that are lopsided in reverse to each other along the predetermined direction in an exit pupil of a shooting optical system;
• and
• performing focus detection of a phase-difference detecting technique according to data obtained from the pair of photoelectric converting units after the exposure at the exposing step in the arrangement of the photoelectric converting units;
• wherein
• due to an error in manufacturing the image pickup device, a relative positional shift occurs from a normalized position where the light beams of the subject are received by the pair of photoelectric converting units with a predetermined light-receiving balance, and
• the focus detecting step includes the steps of
• correcting the data according to a correction amount corresponding to a positional shift amount from the normalized position, and
• performing focus detection of the phase-difference detecting technique according to the data corrected in the correcting step.

An imaging device comprising:

• an image pickup device having an arrangement of photoelectric converting units, the arrangement in which a plurality of pairs of photoelectric converting units are arranged along a predetermined direction, each pair of photoelectric converting units receiving light beams of a subject passing through partial areas in a pair that are lopsided in reverse to each other along the predetermined direction in an exit pupil of a shooting optical system;
• and
• a focus detector performing focus detection of a phase-difference detecting technique according to data obtained from the pair of photoelectric converting units in the arrangement of the photoelectric converting units;
• wherein
• due to an error in manufacturing the image pickup device, a relative positional shift occurs from a normalized position where the light beams of the subject are received by the pair of photoelectric converting units with a predetermined light-receiving balance, and
• the focus detector includes
• a corrector correcting the data according to a correction amount corresponding to a positional shift amount from the normalized position, and
• a focus detector performing focus detection of the phase-difference detecting technique according to the data corrected by the corrector