US 12,439,144 B2
Image acquisition apparatus, image acquisition method, and medium
Hisafumi Ebisawa, Tokyo (JP); Yoshikatsu Ichimura, Tokyo (JP); and Ichiro Harada, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Oct. 13, 2023, as Appl. No. 18/486,200.
Claims priority of application No. 2022-167781 (JP), filed on Oct. 19, 2022.
Prior Publication US 2024/0137637 A1, Apr. 25, 2024
Prior Publication US 2024/0236467 A9, Jul. 11, 2024
Int. Cl. H04N 23/56 (2023.01); G02B 13/22 (2006.01); H04N 5/265 (2006.01); H04N 23/80 (2023.01)
CPC H04N 23/56 (2023.01) [G02B 13/22 (2013.01); H04N 5/265 (2013.01); H04N 23/80 (2023.01)] 16 Claims
OG exemplary drawing
 
1. An image acquisition apparatus for acquiring an image of a subject which is a phase object, the image acquisition apparatus comprising:
a first light irradiation unit including a light source and a collimator which changes light irradiated from the light source into a collimated light, the first light irradiation unit being configured to irradiate the subject with the collimated light which is a first light;
a second light irradiation unit configured to irradiate the subject with a second light at an incident angle different from that of the first light irradiation unit;
an imaging lens comprising a telecentric optical system; and
an imaging unit using the imaging lens, the imaging unit being configured to image the subject to which at least one of the first light and the second light is irradiated,
wherein an optical axis of the imaging lens is parallel to an optical path of the first light irradiation unit,
wherein the imaging unit is disposed opposite to the first light irradiation unit with respect to the subject, on the optical axis, and
wherein an optical path length adjusting unit configured to control a distance between the telecentric optical system and the subject, on the optical axis, is provided.