US 12,242,032 B2
Optical imaging system
Hag Chul Kim, Suwon-si (KR); Eun Chong Lee, Suwon-si (KR); Yong Joo Jo, Suwon-si (KR); and Ga Young An, 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 Aug. 19, 2021, as Appl. No. 17/406,298.
Application 17/406,298 is a continuation of application No. 16/423,218, filed on May 28, 2019, granted, now 11,181,719.
Claims priority of application No. 10-2018-0061410 (KR), filed on May 29, 2018; and application No. 10-2018-0106171 (KR), filed on Sep. 5, 2018.
Prior Publication US 2022/0413264 A1, Dec. 29, 2022
Int. Cl. G02B 3/02 (2006.01); G02B 9/64 (2006.01); G02B 13/00 (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
 
13. An optical imaging system comprising:
a first lens having a positive refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof;
a second lens having a negative refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof;
a third lens having a negative refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof;
a fourth lens having a positive refractive power;
a fifth lens having a negative refractive power;
a sixth lens having a refractive power; and
a seventh lens having a negative refractive power,
wherein the first to seventh lenses are sequentially disposed in ascending numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging plane of the optical imaging system,
the fourth lens has a convex object-side surface in a paraxial region thereof, the sixth lens has a convex object-side surface in a paraxial region thereof, and the seventh lens has a concave image-side surface in a paraxial region thereof,
the fourth lens has a convex image-side surface in a paraxial region thereof, and the sixth lens has a concave image-side surface in a paraxial region thereof, and
the optical imaging system further comprises a spacer disposed between the sixth and seventh lenses and satisfies 0.5<S6d/f<1.4, where S6d is an inner diameter of the spacer, f is an overall focal length of the optical imaging system, and S6d and f are expressed in a same unit of measurement.