US 12,292,555 B2
Zoom lens and image pickup apparatus
Shuichi Kurokawa, Saitama (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Feb. 10, 2023, as Appl. No. 18/167,140.
Claims priority of application No. 2022-023804 (JP), filed on Feb. 18, 2022.
Prior Publication US 2023/0266572 A1, Aug. 24, 2023
Int. Cl. G02B 15/14 (2006.01); G02B 13/00 (2006.01); G02B 13/02 (2006.01); G02B 13/18 (2006.01)
CPC G02B 15/144511 (2019.08) [G02B 13/006 (2013.01); G02B 13/02 (2013.01); G02B 13/18 (2013.01)] 14 Claims
OG exemplary drawing
 
14. An image pickup apparatus comprising:
a zoom lens; and
an image sensor configured to capture an image formed by the zoom lens,
wherein the zoom lens includes, in order from an object side to an image side:
a first lens unit having a negative refractive power;
a second lens unit having a positive refractive power;
a middle group including two or more lens units; and
a rear group including one or more lens units and having a positive refractive power,
wherein the first lens unit does not move for zooming,
wherein during zooming, the second lens unit moves, and each distance between adjacent lens units changes,
wherein in all lens units of the zoom lens, the second lens unit moves by a largest moving amount and has a largest zooming ratio between a wide-angle end and a telephoto end, and
wherein the following inequalities are satisfied:
0.65≤f2p/f2≤2.00
−0.85≤f2n/f2<0
where f2p represents a shortest focal length in a focal length of at least one positive lens in the second lens unit, f2n represents a shortest focal length in a focal length of at least one negative lens in the second lens unit, and f2 represents a focal length of the second lens unit.