US 12,228,792 B2
Optical imaging lens group including six lenses of -+--+- refractive powers
Xiaofang Wang, Zhejiang (CN); Fujian Dai, Zhejiang (CN); and Liefeng Zhao, Zhejiang (CN)
Assigned to ZHEJIANG SUNNY OPTICS CO., LTD., Zhejiang (CN)
Filed by ZHEJIANG SUNNY OPTICS CO.,LTD., Zhejiang (CN)
Filed on Nov. 16, 2021, as Appl. No. 17/527,190.
Claims priority of application No. 202011285775.X (CN), filed on Nov. 17, 2020.
Prior Publication US 2022/0155560 A1, May 19, 2022
Int. Cl. G02B 13/00 (2006.01); G02B 9/62 (2006.01)
CPC G02B 9/62 (2013.01) [G02B 13/0045 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An optical imaging lens group having only six lenses with refractive power, sequentially comprising from an object side to an image side along an optical axis:
a first lens with a negative refractive power;
a second lens with a refractive power;
a third lens with a refractive power, an image-side surface thereof is a concave surface;
a fourth lens with a negative refractive power;
a fifth lens with a refractive power; and
a sixth lens with a refractive power;
wherein Semi-FOV is a half of a maximum field of view of the optical imaging lens group, and Semi-FOV satisfies 45°<Semi-FOV<55 °;
a curvature radius R1 of an object-side surface of the first lens, a curvature radius R2 of an image-side surface of the first lens, a curvature radius R3 of an object-side surface of the second lens and a curvature radius R4 of an image-side surface of the second lens satisfy 0.5<(R1+R2)/(R3−R4)<1.5;
ΣAT is a sum of spacing distances of any two adjacent lenses in the first lens to the sixth lens, and ΣAT and a spacing distance T34 of the third lens and the fourth lens on the optical axis satisfy 0.42<T34/ΣAT<0.8.