Patent ID: 8860871

Claim:
An imaging device comprising: a capturing lens that is movable in an optical axis direction; an imaging element in which a plurality of photoelectric conversion elements which include a pair of horizontal light receiving devices and a pair of vertical light receiving devices are two-dimensionally arranged, the pair of horizontal light receiving devices being aligned in a horizontal direction to receive a pair of split light of the horizontal direction which is obtained by performing a pupil split on light incident to the capturing lens in the horizontal direction, and the pair of vertical light receiving devices being aligned in a vertical direction to receive a pair of split light of the vertical direction which is obtained by performing the pupil split on light incident to the capturing lens in the vertical direction; a movement device that moves the capturing lens in the optical axis direction; a calculation device that calculates an absolute value of signal amount difference between electric signals obtained by the pair horizontal light receiving devices and an absolute value of signal amount difference between electric signals obtained by the pair vertical light receiving devices; a specifying device that specifies one of the pair of horizontal light receiving devices or the pair of vertical light receiving devices, in which the calculated absolute value of the signal amount difference is smaller; and a control device that performs correlation computation based on the signal amount of the plurality of photoelectric conversion elements which are aligned in a direction of the specified one of the pair of horizontal light receiving devices or the pair of vertical light receiving devices, and that controls the movement device so as to move the capturing lens to a focusing position based on a result of the correlation computation, wherein the control device controls the movement device so as to move the capturing lens to the focusing position, based on a signal amount between electric signals obtained by light receiving devices, which are paired with each other in a specified oblique direction with respect to the imaging element, out of each light receiving device of the pair of horizontal light receiving devices and the pair of vertical light receiving devices of the plurality of photoelectric conversion elements, without performing the specifying and the controlling, if both of the absolute value of signal amount difference between the electric signals obtained by the pair of horizontal light receiving devices and the absolute value of signal amount difference between the electric signals obtained by the pair of vertical light receiving devices is less than the predetermined threshold value and is equal to or greater than another predetermined threshold value that is less than the predetermined threshold value.