US 12,436,372 B2
Zoom lens, image pickup apparatus, and imaging system
Masato Katayose, Tochigi (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Dec. 8, 2022, as Appl. No. 18/063,122.
Claims priority of application No. 2022-000015 (JP), filed on Jan. 1, 2022.
Prior Publication US 2023/0213744 A1, Jul. 6, 2023
Int. Cl. G02B 15/20 (2006.01)
CPC G02B 15/20 (2013.01) 17 Claims
OG exemplary drawing
 
1. A zoom lens comprising, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, and a subsequent unit including a plurality of lens units,
wherein a distance between adjacent lens units changes during zooming,
wherein the first lens unit does not move and the second lens unit moves during zooming,
wherein the first lens unit consists of, in order from the object side to the image side, a first subunit and a second subunit,
wherein the first subunit consists of two positive lenses,
wherein the second subunit consists of a single positive lens and a single negative lens, and
wherein the following inequalities are satisfied:
−0.45<f1a/f1b<−0.10
−5.50<f1/f2<−3.00
0.60<f1/ft<1.10
where f1a is a focal length of the first subunit, f1b is a focal length of the second subunit, f1 is a focal length of the first lens unit, f2 is a focal length of the second lens unit, and ft is a focal length of the zoom lens at a telephoto end.