US 11,982,790 B2
Optical imaging system
Jian Wang, Ningbo (CN); Lingbo He, Ningbo (CN); Jianjun Li, Ningbo (CN); Fujian Dai, Ningbo (CN); and Liefeng Zhao, Ningbo (CN)
Assigned to ZHEJIANG SUNNY OPTICAL CO, LTD., Ningbo (CN)
Filed by ZHEJIANG SUNNY OPTICAL CO, LTD., Ningbo (CN)
Filed on Oct. 9, 2020, as Appl. No. 17/067,099.
Claims priority of application No. 201911295487.X (CN), filed on Dec. 16, 2019.
Prior Publication US 2021/0181484 A1, Jun. 17, 2021
Int. Cl. G02B 9/64 (2006.01); G02B 13/00 (2006.01); G02B 27/00 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/64 (2013.01); G02B 27/0025 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An optical imaging system, comprising:
a plurality of lenses consisting of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, which are sequentially arranged from an object side to an image side of the optical imaging system along an optical axis,
wherein,
each of the first lens to the seventh lens has refractive power;
an object-side surface of the first lens is a concave surface, and an image-side surface of the first lens is a concave surface;
an object-side surface of the second lens is a convex surface, and an image-side surface of the second lens is a convex surface; and
an object-side surface of the third lens is a concave surface, and an image-side surface of the third lens is a convex surface;
wherein −2.0<f4/f<−1.5,
Semi-FOV≥55°,
where f4 is an effective focal length of the fourth lens, f is a total effective focal length of the optical imaging system, and Semi-FOV is half of a maximal field-of-view of the optical imaging system, and
wherein −2.5<f1/f2<−2.0,
wherein f1 is an effective focal length of the first lens, and f2 is an effective focal length of the second lens.