US 12,259,530 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 Mar. 29, 2023, as Appl. No. 18/127,956.
Application 18/127,956 is a continuation of application No. 17/406,298, filed on Aug. 19, 2021.
Application 17/406,298 is a continuation of application No. 16/423,218, filed on May 28, 2019, granted, now 11,181,719, issued on Nov. 23, 2021.
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 2023/0228977 A1, Jul. 20, 2023
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)] 15 Claims
OG exemplary drawing
 
1. 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 positive refractive power;
a fourth lens having a negative refractive power and a convex object-side surface in a paraxial region thereof;
a fifth lens having a refractive power;
a sixth lens having a positive 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,
at least one inflection point is formed on either one or both of an object-side surface of the seventh lens and an image-side surface of the seventh lens,
the optical imaging system has a total of seven lenses having a refractive power, and
0.01<R1/R4<1.3 is satisfied, where R1 is a radius of curvature of the object-side surface of the first lens at the optical axis, R4 is a radius of curvature of the image-side surface of the second lens at the optical axis, and R1 and R4 are expressed in a same unit of measurement, and
0.2<ΣSD/ΣTD<0.7 is satisfied, where ΣSD is a sum of air gaps along the optical axis between the first to seventh lenses, ΣTD is a sum of thicknesses along the optical axis of the first to seventh lenses, and ΣSD and ΣTD are expressed in a same unit of measurement.