US 11,914,118 B2
Optical imaging system
Hag Chul Kim, Suwon-si (KR); Phil Ho Jung, 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. 4, 2022, as Appl. No. 17/881,072.
Application 17/881,072 is a continuation of application No. 17/212,229, filed on Mar. 25, 2021.
Claims priority of application No. 10-2020-0181646 (KR), filed on Dec. 23, 2020.
Prior Publication US 2022/0382025 A1, Dec. 1, 2022
Int. Cl. G02B 13/00 (2006.01); G02B 9/12 (2006.01); G03B 17/17 (2021.01); G02B 15/14 (2006.01)
CPC G02B 13/0065 (2013.01) [G02B 9/12 (2013.01); G02B 13/009 (2013.01); G02B 13/0045 (2013.01); G02B 15/143 (2019.08); G02B 15/1435 (2019.08); G02B 15/143503 (2019.08); G03B 17/17 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An optical imaging system comprising:
a first lens, a second lens, a third lens, a fourth lens, fifth lens, a sixth lens, and a seventh lens,
wherein the first to seventh lenses are sequentially disposed from an object side to an imaging plane,
wherein the second lens, the fourth lens, and the sixth lens have positive refractive power, respectively,
wherein a thickness along an optical axis of the fifth lens is greater than a thickness along an optical axis of the first lens,
wherein the optical imaging system satisfies −1.2<fw/f5<−0.6, where fw is a focal length of the optical imaging system at a wide-angle end and f5 is a focal length of the fifth lens,
wherein the optical imaging system satisfies 0.1<Nd2−Nd3<0.2, where Nd2 is a refractive index of the second lens and Nd3 is a refractive index of the third lens, and
wherein the optical imaging system comprises no more than three lens groups and no more than seven lenses.