US 10,893,188 B2
Imaging apparatus having autofocus function, and focus adjustment method therefor
Masaki Tokioka, Fujisawa (JP); Hiromi Kotoku, Tokyo (JP); Hidetoshi Abe, Tokyo (JP); Takeshi Omata, Sagamihara (JP); Kenya Fukabori, Tokyo (JP); Naoki Iwasaki, Kawasaki (JP); and Hiroaki Kurisu, Tokyo (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jan. 25, 2019, as Appl. No. 16/257,370.
Claims priority of application No. 2018-015455 (JP), filed on Jan. 31, 2018.
Prior Publication US 2019/0238756 A1, Aug. 1, 2019
Int. Cl. H04N 5/232 (2006.01); H04N 5/235 (2006.01)
CPC H04N 5/232122 (2018.08) [H04N 5/2353 (2013.01); H04N 5/232121 (2018.08); H04N 5/232125 (2018.08)] 18 Claims
OG exemplary drawing
 
1. An imaging apparatus comprising:
an imaging device that photoelectrically converts an optical image obtained through a focus lens and outputs image signals;
a memory storing instructions; and
a processor that implements the instructions to execute a plurality of tasks, including:
a focus detecting task that performs focus detection based on the image signals output from the imaging device, in a state where an aperture value is set to a first aperture value;
a driving task that drives the focus lens to a focus position set according to the focus detection performed by the focus detecting task;
a first acquiring task that acquires a first correction amount of the set focus position according to a difference between the first aperture value and a second aperture value to be used at a time of photographing;
a position determining task that determines a focus position at the time of photographing; and
a controlling task that controls photographing using the determined focus position at the time of photographing, when a user's operation is received,
wherein the position determining task determines:
in a case where the first correction amount is larger than a predetermined amount, a focus position corrected according to the first correction amount as the focus position at the time of photographing; and
in a case where the first correction amount is equal to or smaller than the predetermined amount, the set focus position as the focus position at the time of photographing.