US 11,988,896 B2
Optical imaging system including seven lenses of +-+--+- refractive powers
Kil Soo Shin, 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 Feb. 3, 2021, as Appl. No. 17/166,504.
Claims priority of application No. 10-2020-0068432 (KR), filed on Jun. 5, 2020.
Prior Publication US 2021/0382267 A1, Dec. 9, 2021
Int. Cl. G02B 13/00 (2006.01); G02B 9/64 (2006.01)
CPC G02B 9/64 (2013.01) [G02B 13/0045 (2013.01)] 26 Claims
OG exemplary drawing
 
22. An optical imaging system comprising:
a first lens, a second lens, a third lens, a fourth lens having a negative refractive power and a convex object-side surface in a paraxial region thereof, a fifth lens having a negative refractive power, a sixth lens, and a seventh lens sequentially disposed in ascending numerical order along an optical axis from an object side of the optical imaging system toward an imaging plane of an image sensor,
wherein 15<v1-v3<45 is satisfied, where v1 is an Abbe number of the first lens, and v3 is an Abbe number of the third lens.
25<v1-v4<45 is satisfied, where v4 is an Abbe number of the fourth lens,
15<v1-v5<45, where v5 is an Abbe number of the fifth lens,
−9<f4/f<0 is satisfied, where f4 is a focal length of the fourth lens, and f is a focal length of the optical imaging system, and
the first to seventh lenses are the only lenses in the optical imaging system.