US 11,940,666 B2
Optical imaging system comprising four lenses of ++++ refractive powers
Hag Chul Kim, 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 Aug. 23, 2021, as Appl. No. 17/408,749.
Application 17/408,749 is a continuation of application No. 16/506,063, filed on Jul. 9, 2019, granted, now 11,125,973.
Claims priority of application No. 10-2018-0142402 (KR), filed on Nov. 19, 2018.
Prior Publication US 2021/0382265 A1, Dec. 9, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 9/34 (2006.01); G02B 13/00 (2006.01)
CPC G02B 9/34 (2013.01) [G02B 13/004 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An optical imaging system, comprising:
a first lens having positive refractive power, a second lens having positive refractive power, a third lens having positive refractive power, and a fourth lens having positive refractive power, sequentially disposed from an object side to an image surface of the optical imaging system,
wherein an F number of the optical imaging system is equal to or less than 1.0, and
wherein 5.0<R5/f<80, where f is a focal length of the optical imaging system, and R5 is a radius of curvature of an object-side surface of the third lens.