US 12,019,218 B2
Optical imaging lens group
Jiaying Zhang, Zhejiang (CN); Fujian Dai, Zhejiang (CN); and Liefeng Zhao, Zhejiang (CN)
Assigned to ZHEJIANG SUNNY OPTICS CO., LTD., Ningbo (CN)
Filed by ZHEJIANG SUNNY OPTICS CO., LTD., Zhejiang (CN)
Filed on Mar. 25, 2021, as Appl. No. 17/211,853.
Claims priority of application No. 202010289853.7 (CN), filed on Apr. 14, 2020.
Prior Publication US 2021/0318522 A1, Oct. 14, 2021
Int. Cl. G02B 13/00 (2006.01); G02B 9/60 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/60 (2013.01); G02B 13/0065 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An optical imaging lens group, sequentially comprising from an object side to an image side along an optical axis:
a first prism has a first reflective surface;
a first lens has a refractive power, and an object-side surface thereof is a convex surface;
a second lens has a refractive power;
a third lens has a refractive power, an object-side surface thereof is a concave surface and an image-side surface thereof is a convex surface;
a fourth lens has a refractive power;
a fifth lens has a refractive power; and
a second prism has a second reflective surface; and
an optical distortion Dist. of the optical imaging lens group satisfies: |Dist.|<0.1%;
a combined focal length f12 of the first lens and the second lens and an effective focal length f4 of the fourth lens satisfy: −0.7<f4/f12<−0.2.