US 12,298,478 B2
Optical imaging system
Ho Sik Yoo, Suwon-si (KR); Dong Shin Yang, Suwon-si (KR); Yong Joo Jo, Suwon-si (KR); and Sot Eum Seo, 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. 11, 2024, as Appl. No. 18/601,148.
Application 18/601,148 is a continuation of application No. 18/299,984, filed on Apr. 13, 2023, granted, now 11,960,058.
Application 18/299,984 is a continuation of application No. 17/101,187, filed on Nov. 23, 2020, granted, now 11,656,434, issued on May 23, 2023.
Application 17/101,187 is a continuation of application No. 15/892,758, filed on Feb. 9, 2018, granted, now 10,877,245, issued on Dec. 29, 2020.
Claims priority of application No. 10-2017-0105365 (KR), filed on Aug. 21, 2017.
Prior Publication US 2024/0219690 A1, Jul. 4, 2024
Int. Cl. G02B 9/34 (2006.01); G02B 9/38 (2006.01); G02B 9/50 (2006.01); G02B 9/56 (2006.01); G02B 13/00 (2006.01); G02B 13/02 (2006.01)
CPC G02B 13/004 (2013.01) [G02B 9/38 (2013.01); G02B 9/50 (2013.01); G02B 9/56 (2013.01); G02B 13/0065 (2013.01); G02B 13/02 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An optical imaging system comprising:
a first lens having a positive refractive power and a convex object-side surface in a paraxial region thereof;
a second lens having a 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; and
a fourth 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,
wherein the first to fourth 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 optical imaging system has a total of four lenses,
0.8<TTL/f<1.5 is satisfied, where TTL is a distance along the optical axis from the object-side surface of the first lens to the imaging plane, and f is an overall focal length of the optical imaging system,
FOV≤40° is satisfied, where FOV is a field of view of the optical imaging system, and
1.3<TTL/BFL<3.5 is satisfied, where BFL is a distance along the optical axis from the image-side surface of the fourth lens to the imaging plane.