US 11,953,662 B2
Zoom lens, lens barrel, and image-capturing device
Tomoya Koga, Tokyo (JP)
Assigned to RICOH COMPANY, LTD., Tokyo (JP)
Filed by Ricoh Company, Ltd., Tokyo (JP)
Filed on Jan. 25, 2021, as Appl. No. 17/157,031.
Claims priority of application No. 2020-033480 (JP), filed on Feb. 28, 2020; and application No. 2021-002696 (JP), filed on Jan. 12, 2021.
Prior Publication US 2021/0278642 A1, Sep. 9, 2021
Int. Cl. G02B 15/14 (2006.01); G02B 15/16 (2006.01)
CPC G02B 15/1431 (2019.08) [G02B 15/1451 (2019.08); G02B 15/1461 (2019.08); G02B 15/16 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A zoom lens comprising, sequentially from an object side toward an image side:
a first lens group having positive refractive power;
a second lens group having negative refractive power; and
a rear group,
the second lens group consisting of, sequentially from the object side toward the image side:
a second sub-first lens group having positive or negative power; and
a second sub-second lens group having negative power,
the second sub-second lens group consisting of, sequentially from the object side toward the image side:
a positive second-first lens component;
a negative second-second lens component; and
a negative second-third lens component, wherein
during zooming from a short focal length end to a long focal length end, a distance between the first lens group and the second lens group increases, and a distance between the second lens group and the rear group decreases, and
a part of the second lens group is movable in a direction perpendicular to an optical axis during correction of image blurring.