US 12,067,949 B2
Optical apparatus capable of adjusting a light amount in each of a plurality of optical systems with a simple structure
Katsuhiko Sato, Tochigi (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Dec. 12, 2022, as Appl. No. 18/064,392.
Claims priority of application No. 2021-205722 (JP), filed on Dec. 20, 2021; and application No. 2021-205741 (JP), filed on Dec. 20, 2021.
Prior Publication US 2023/0197019 A1, Jun. 22, 2023
Int. Cl. G09G 3/34 (2006.01); H04N 23/71 (2023.01); H04N 23/75 (2023.01)
CPC G09G 3/342 (2013.01) [H04N 23/71 (2023.01); H04N 23/75 (2023.01)] 14 Claims
OG exemplary drawing
 
1. An optical apparatus comprising:
a plurality of optical systems each of which includes a stop;
a storage, wherein information indicating a relationship between a target aperture diameter of a respective stop and a target light amount in a corresponding respective optical system is stored in the storage; and
a controller configured to adjust a light amount by changing an aperture diameter of the respective stop in the corresponding respective optical system based on the information,
wherein each optical system of the plurality of optical systems has a same focal length,
wherein the information is generated by determining the target aperture diameter of the respective stop corresponding to the target light amount by measuring the light amount when the aperture diameter of the respective stop is changed in the corresponding respective optical system, and
wherein the target light amount is corrected based on a difference between a first light amount at a predetermined aperture diameter of the respective stop and a second light amount at a predetermined aperture diameter of a stop of a predetermined optical system in the plurality of optical systems when the target aperture diameter of the respective stop corresponding to the target light amount is determined in the corresponding respective optical system.