US 12,228,700 B2
Optical imaging lens group including seven lenses +−+−−+−, +−−−−+−, +−++−+−, +−+−++−or +++−++− refractive powers
Yanping Li, Zhejiang (CN); Lingbo He, 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 Jul. 7, 2021, as Appl. No. 17/368,867.
Claims priority of application No. 202011092763.5 (CN), filed on Oct. 13, 2020.
Prior Publication US 2022/0113516 A1, Apr. 14, 2022
Int. Cl. G02B 13/00 (2006.01); G02B 9/64 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/64 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An optical imaging lens group, sequentially comprising from an object side to an image side along an optical axis of the optical imaging lens group:
a first lens with a positive refractive power;
a second lens with a refractive power, an image-side surface of the second lens thereof is a concave surface;
a third lens with a refractive power;
a fourth lens with a refractive power, an image-side surface of the fourth lens thereof is a concave surface;
a fifth lens with a refractive power;
a sixth lens with a refractive power, an image-side surface of the sixth lens thereof is a concave surface; and
a seventh lens with a negative refractive power, an object-side surface of the seventh lens is a convex surface and an image-side surface of the seventh lens is a concave surface;
wherein a maximum field of view FOV of the optical imaging lens group and an effective focal length f of the optical imaging lens group satisfy tan(FOV/2)*f>5 mm; and
a curvature radius R12 of the image-side surface of the sixth lens and a curvature radius R14 of an image-side surface of the seventh lens satisfy 1<R12/R14<2;
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 spacing distance T12 between the first lens and the second lens on the optical axis satisfy |R2−R3|/T12≤3.92;
an effective focal length f6 of the sixth lens and an effective focal length f7 of the seventh lens satisfy −2<f6/f7<−1.