US 12,189,098 B2
Zoom lens and image pickup apparatus
Hirofumi Abe, Tochigi (JP); Kazuki Someya, Aichi (JP); and Kenta Sudo, Tochigi (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Dec. 10, 2021, as Appl. No. 17/547,276.
Claims priority of application No. 2021-016051 (JP), filed on Feb. 3, 2021.
Prior Publication US 2022/0244496 A1, Aug. 4, 2022
Int. Cl. G02B 13/00 (2006.01); G02B 9/62 (2006.01); G02B 13/02 (2006.01); G03B 5/02 (2021.01)
CPC G02B 13/009 (2013.01) [G02B 9/62 (2013.01); G02B 13/0045 (2013.01); G02B 13/02 (2013.01); G03B 5/02 (2013.01)] 12 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;
a second lens unit having a negative refractive power; and
a subsequent unit,
wherein the first lens unit is configured not to move for zooming,
wherein a distance between each pair of adjacent lens units changes in zooming,
wherein the first lens unit includes a first subunit having a positive refractive power on the object side of an air spacing that is largest in the first lens unit, and a second subunit having a negative refractive power on the image side of the air spacing, and
wherein the following conditions are satisfied:
0.68≤f1/ft≤1.20,
0.27≤TDt/ft≤0.90,
1.20≤f1/f1a≤2.60, and
0.01≤D1/f1≤0.30,
 where f1 is a focal length of the first lens unit, ft is a focal length of the zoom lens at a telephoto end, TDt is a length on an optical axis of the zoom lens from a surface closest to the object side to a surface closest to the image side at the telephoto end, f1a is a focal length of the first subunit, and D1 is a length on the optical axis from a surface closest to the object side to a surface closest to the image side of the first lens unit.