US 12,405,454 B2
Zoom lens and image pickup apparatus having the same
Yoshiyuki Taki, Tochigi (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Mar. 28, 2024, as Appl. No. 18/619,272.
Claims priority of application No. 2023-063092 (JP), filed on Apr. 7, 2023.
Prior Publication US 2024/0337820 A1, Oct. 10, 2024
Int. Cl. G02B 13/06 (2006.01); G02B 9/34 (2006.01); G02B 13/00 (2006.01); G02B 13/02 (2006.01)
CPC G02B 13/06 (2013.01) [G02B 9/34 (2013.01); G02B 13/009 (2013.01); G02B 13/02 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A zoom lens comprising, in order from an object side to an image side:
a first lens unit having negative refractive power; and
a plurality of subsequent lens units,
wherein the zoom lens further comprises an aperture stop,
wherein for zooming, the first lens unit is fixed, and the plurality of subsequent lens units move to change a distance between adjacent lens units, and
wherein the following inequalities are satisfied:

OG Complex Work Unit Math
where Tsw is a distance on an optical axis from a lens surface closest to an object of the zoom lens to the aperture stop at a wide-angle end, fw is a focal length of the zoom lens at the wide-angle end, and Skw is a back focus of the zoom lens at the wide-angle end.