US 12,422,652 B2
Zoom lens and image pickup apparatus
Tomoya Yamada, Tochigi (JP); Yonghee Lee, Tochigi (JP); and Yu Inomoto, Saitama (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Mar. 24, 2023, as Appl. No. 18/189,265.
Claims priority of application No. 2022-076139 (JP), filed on May 2, 2022.
Prior Publication US 2023/0350168 A1, Nov. 2, 2023
Int. Cl. G02B 13/00 (2006.01); G02B 13/02 (2006.01); G02B 15/14 (2006.01)
CPC G02B 13/009 (2013.01) [G02B 13/0045 (2013.01); G02B 13/02 (2013.01); G02B 15/145125 (2019.08)] 19 Claims
OG exemplary drawing
 
1. A zoom lens comprising in order from an object side to an image side, a first lens unit having a positive refractive power that does not move for zooming, three or more intermediate lens units that move during zooming, and a rear lens unit having a positive refractive power,
wherein each interval between adjacent lens units changes during zooming,
wherein the zoom lens includes an aperture stop in the rear lens unit, in a lens unit arranged adjacent to the rear lens unit, or between the lens unit arranged adjacent to the rear lens unit and the rear lens unit,
wherein the first lens unit includes in order from the object side to the image side, a first lens subunit having a negative refractive power that does not move for focusing, a second lens subunit having a positive refractive power that moves for focusing, and a third lens subunit having a positive refractive power,
wherein following inequalities are satisfied,
1.700≤(f1+bok1)/f1≤2.200
1.50≤f1/fw≤4.00
7.1≤ft/fw≤10.0
where f1 represents a focal length of the first lens unit, bok1 represents a length on an optical axis from a surface arranged at a most image-side of the first lens unit to a rear principal point of the first lens unit, fw represents a focal length of the zoom lens at a wide angle end, and ft represents a focal length of the zoom lens at a telephoto end.