IMAGING DEVICE AND FOCUSING CONTROL METHOD

摘要

A digital camera includes a focusing-control-unit that calculates a defocus amount using detection signals of phase difference detection pixels and drives a focus lens according to the defocus amount, and a movement-detection-unit that detects whether a movement is present in a captured subject-image. The focusing-control-unit calculates the defocus amount according to an auto-focus instruction, and drives, in a case where the defocus amount exceeds a threshold-value, the focus lens according to the defocus amount and then performs the phase difference AF again to complete auto-focusing. Further, in a case where the defocus amount is equal to or smaller than the threshold-value, the focusing control unit performs the phase difference AF only once to complete the auto-focusing. Further, in a case where a movement is present in the subject-image, the focusing-control-unit sets the threshold to a larger value than in a case where a movement is not present in the subject-image.

主权项

1. An imaging device comprising:
an imaging element that includes a first signal detection unit that detects a signal based on one beam among a pair of beams that passes through different portions in a pupil region of an imaging optical system including a focus lens, and a second signal detection unit that detects a signal based on the other beam among the pair of beams, and images a subject through the imaging optical system; a focusing control unit that calculates a defocus amount using a detection signal of the first signal detection unit and a detection signal of the second signal detection unit and drives the focus lens according to the defocus amount; and a movement detection unit that detects whether a movement is present in a subject image captured by the imaging element, wherein the focusing control unit calculates the defocus amount according to an auto-focus execution instruction, drives, in a case where the defocus amount exceeds a threshold value, the focus lens according to the defocus amount and then performs the calculation of the defocus amount using the detection signal of the first signal detection unit and the detection signal of the second signal detection unit and the driving of the focus lens according to the defocus amount again to complete auto-focusing, drives, in a case where the defocus amount calculated according to the execution instruction is equal to or smaller than the threshold value, the focus lens according to the defocus amount to complete the auto-focusing, and sets the threshold value to a larger value in a case where a movement is present in the subject image than in a case where a movement is not present in the subject image.