Focusing control device, focusing control method, focusing control program, lens device, and imaging device

A focusing control method comprising:

• a first correlation value generation step of acquiring correlation values between a first signal group output from a plurality of first signal detection sections of a focus detection area of a sensor and a second signal group output from a plurality of second signal detection sections of the focus detection area, the plurality of first signal detection sections receiving one of a pair of luminous fluxes passing through different portions arranged in one direction of a pupil region of an imaging optical system including a focus lens and detecting signals corresponding to light reception amounts and the plurality of second signal detection sections receiving other one of the pair of luminous fluxes and detecting signals corresponding to light reception amounts being formed in the focus detection area;
• a second correlation value generation step of performing a process of acquiring correlation values between a third signal group output from the plurality of first signal detection sections included in each of divided areas in a state in which the focus detection area is divided in the one direction and a fourth signal group output from the plurality of second signal detection sections included in the divided area, for each of the divided areas;
• a first phase difference amount measurement step of measuring a first phase difference amount between the first signal group and the second signal group from the correlation values acquired in the first correlation value generation step;
• a second phase difference amount measurement step of measuring a second phase difference amount between the third signal group and the fourth signal group for each of the divided areas from the correlation values acquired in the second correlation value generation step;
• a target position determination step of selectively performing a first process of determining a target position of the focus lens based on the first phase difference amount and a second process of determining the target position of the focus lens based on the second phase difference amount, based on the correlation values acquired in the first correlation value generation step and the correlation values acquired in the second correlation value generation step;
• and
• a lens driving control step of driving the focus lens to the target position determined through the first process or the second process,
• wherein the first correlation value generation step, the second correlation value generation step, the first phase difference amount measurement step, the second phase difference amount measurement stem the target position determination step, and the lens driving control step are implemented by at least one hardware processor.

A non-transitory computer readable medium storing a focusing control program causing a computer to perform:

• a first correlation value generation step of acquiring correlation values between a first signal group output from a plurality of first signal detection sections of a focus detection area of a sensor and a second signal group output from a plurality of second signal detection sections of the focus detection area, the plurality of first signal detection sections receiving one of a pair of luminous fluxes passing through different portions arranged in one direction of a pupil region of an imaging optical system including a focus lens and detecting signals corresponding to light reception amounts and the plurality of second signal detection sections receiving other one of the pair of luminous fluxes and detecting signals corresponding to light reception amounts being formed in the focus detection area;
• a second correlation value generation step of performing a process of acquiring correlation values between a third signal group output from the plurality of first signal detection sections included in each of divided areas in a state in which the focus detection area is divided in the one direction and a fourth signal group output from the plurality of second signal detection sections included in the divided area, for each of the divided areas;
• a first phase difference amount measurement step of measuring a first phase difference amount between the first signal group and the second signal group from the correlation values acquired in the first correlation value generation step;
• a second phase difference amount measurement step of measuring a second phase difference amount between the third signal group and the fourth signal group for each of the divided areas from the correlation values acquired in the second correlation value generation step;
• a target position determination step of selectively performing a first process of determining a target position of the focus lens based on the first phase difference amount and a second process of determining the target position of the focus lens based on the second phase difference amount, based on the correlation values acquired in the first correlation value generation step and the correlation values acquired in the second correlation value generation step;
• and
• a lens driving control step of driving the focus lens to the target position determined through the first process or the second process,
• wherein the first correlation value generation step, the second correlation value generation step, the first phase difference amount measurement step, the second phase difference amount measurement step, the target position determination step, and the lens driving control step are implemented by at least one hardware processor.