US 12,204,080 B2
Zoom lens
Shunji Iwamoto, Tochigi (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Nov. 1, 2023, as Appl. No. 18/499,948.
Application 18/499,948 is a continuation of application No. 17/381,872, filed on Jul. 21, 2021, granted, now 11,860,348.
Claims priority of application No. 2020-129834 (JP), filed on Jul. 31, 2020.
Prior Publication US 2024/0061225 A1, Feb. 22, 2024
Int. Cl. G02B 15/20 (2006.01); G02B 15/14 (2006.01); G02B 27/00 (2006.01)
CPC G02B 15/20 (2013.01) [G02B 15/143105 (2019.08); G02B 27/0025 (2013.01)] 26 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;
an intermediate unit having two lens units; and
a rear group having a positive refractive power as a whole and including one or more lens units,
wherein a distance between adjacent lens units changes during zooming,
wherein the intermediate unit consists of an intermediate lens unit and a second lens unit having a negative power,
wherein the first lens unit consists of a first subunit having a positive refractive power and a second subunit disposed on the image side of the first subunit,
wherein the first subunit and the second subunit are separated by largest interval in the first lens unit,
wherein the first subunit consists of a first positive lens,
wherein the second subunit includes a second positive lens and a first negative lens,
wherein a lens unit closest to the image side in the rear group includes a positive lens and a plurality of negative lenses,
wherein the first lens unit is fixed during focusing, and
wherein the following inequalities are satisfied:
−8.0<f1/f2<−2.5
where f1 is a focal length of the first lens unit, and f2 is a focal length of the second lens unit.