US 11,808,919 B2
Optical imaging system including seven lenses of +−+−++− or +−+−−+− refractive powers
Il Yong Park, 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 Sep. 11, 2020, as Appl. No. 17/017,792.
Claims priority of application No. 10-2020-0067933 (KR), filed on Jun. 4, 2020.
Prior Publication US 2021/0382273 A1, Dec. 9, 2021
Int. Cl. G02B 13/00 (2006.01); G02B 9/64 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/64 (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, a fifth lens, a sixth lens, and a seventh lens disposed in order from an object side,
wherein −4<f2/f<−1 is satisfied, where f2 is a focal length of the second lens, and f is a focal length of the optical imaging system,
wherein TTL/(2*IMG HT)≤0.6 is satisfied, where TTL is a distance on an optical axis from an object-side surface of the first lens to an imaging plane of an image sensor, and IMG HT is half a diagonal length of the imaging plane of the image sensor,
wherein the optical imaging system has a total of seven lenses, and
wherein the first lens has positive refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has negative refractive power, the sixth lens has positive refractive power, and the seventh lens has negative refractive power.