Patent ID: 9699372
Date: 2017-07-04
CPC Classifications: G02B,H04N

Claim:
1. An imaging device comprising: an imaging element that includes an imaging surface where a plurality of signal detection units including a first signal detection unit that detects a signal corresponding to a beam that passes through one divided region among divided regions of a pupil region of an imaging optical system divided in a row direction, a second signal detection unit that detects a signal corresponding to a beam that passes through the other divided region, and a third signal detection unit that detects a signal corresponding to beams that pass through the two divided regions are arranged in a two-dimensional pattern in the row direction and a column direction that is orthogonal to the row direction, in which only the third signal detection units are arranged in the vicinity of a pair line where plural pairs of the first signal detection unit and the second signal detection unit are arranged in the row direction; a defocus amount generator that calculates, through an operation using a detection signal group of the third signal detection units that are arranged in a row different from a row including the plurality of first signal detection units that forms the pair line and a row including the plurality of second signal detection units that forms the pair line and are arranged at the same pitch as an arrangement pitch of the pairs that form the pair line, in which the number of third signal detection units is larger than the number of pairs that form the pair line, a detection signal group of the plurality of first signal detection units and a detection signal group of the plurality of second signal detection units, a third correlation value corresponding to a value obtained by adding up a first correlation value between the detection signal group of the plurality of first signal detection units and the detection signal group of the third signal detection units and a second correlation value between the detection signal group of the plurality of second signal detection units and the detection signal group of the third signal detection units, and generates a defocus amount from the third correlation value; and a focusing controller that performs a focusing control for the imaging optical system based on the defocus amount generated by the defocus amount generator.