US 12,242,038 B2
Optical imaging system
Il Yong Park, Suwon-si (KR); In Do Seo, Suwon-si (KR); and Yong Joo Jo, Suwon-si (KR)
Assigned to Samsung Electro-Mechanics Co., Ltd., Suwon-si (KR)
Filed by SAMSUNG ELECTRO-MECHANICS CO., LTD., Suwon-si (KR)
Filed on Jul. 6, 2023, as Appl. No. 18/347,825.
Application 18/347,825 is a continuation of application No. 17/578,877, filed on Jan. 19, 2022, granted, now 11,740,440.
Application 17/578,877 is a continuation of application No. 16/410,026, filed on May 13, 2019, granted, now 11,262,541, issued on Mar. 1, 2022.
Claims priority of application No. 10-2018-0144384 (KR), filed on Nov. 21, 2018.
Prior Publication US 2023/0350166 A1, Nov. 2, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 3/02 (2006.01); G02B 9/64 (2006.01); G02B 13/00 (2006.01); G02B 13/04 (2006.01); G02B 15/14 (2006.01); G02B 21/02 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/64 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An optical imaging system comprising:
a first lens comprising a convex object-side surface and a concave image-side surface;
a second lens comprising a refractive power;
a third lens comprising positive refractive power and a convex object-side surface;
a fourth lens comprising a refractive power;
a fifth lens comprising a refractive power and a concave object-side surface in a paraxial region;
a sixth lens comprising a refractive power; and
a seventh lens comprising a refractive power,
wherein the first to seventh lenses are sequentially disposed in ascending numerical order from an object side toward an imaging plane,
wherein a radius of curvature of an object-side surface of the seventh lens is greater than a radius of curvature of an image-side surface of the sixth lens, and
wherein −5.0<f2/f<−2.0 and 3.0<|f4/f|, where f is a focal length of the optical imaging system, f2 is a focal length of the second lens, and f4 is a focal length of the fourth lens.