US 12,169,324 B2
Optical imaging lens group
Yunbing Ji, Zhejiang (CN); Dawei Tang, Zhejiang (CN); Fujian Dai, Zhejiang (CN); and Liefeng Zhao, Zhejiang (CN)
Assigned to ZHEJIANG SUNNY OPTICS CO., LTD., Zhejiang (CN)
Appl. No. 17/438,952
Filed by ZHEJIANG SUNNY OPTICS CO., LTD., Zhejiang (CN)
PCT Filed May 22, 2020, PCT No. PCT/CN2020/091850
§ 371(c)(1), (2) Date Sep. 14, 2021,
PCT Pub. No. WO2021/012770, PCT Pub. Date Jan. 28, 2021.
Claims priority of application No. 201910661727.7 (CN), filed on Jul. 22, 2019.
Prior Publication US 2022/0146787 A1, May 12, 2022
Int. Cl. G02B 9/62 (2006.01); G02B 13/00 (2006.01)
CPC G02B 9/62 (2013.01) [G02B 13/0045 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An optical imaging lens group with six lenses, sequentially comprising, from an object side to an image side along an optical axis:
a diaphragm;
a first lens with a positive refractive power, an object-side surface thereof being a convex surface;
a second lens with a positive refractive power;
a third lens with a negative refractive power, an image-side surface thereof being a concave surface;
a fourth lens with a positive refractive power, an object-side surface thereof being a convex surface, while an image-side surface thereof being a concave surface;
a fifth lens with a positive refractive power, an object-side surface thereof being a concave surface, while an image-side surface thereof being a convex surface; and
a sixth lens with a negative refractive power, an object-side surface thereof being a convex surface, while an image-side surface thereof being a concave surface,
wherein ω is a half of a field of view of the optical imaging lens group, and f5 is an effective focal length of the fifth lens, f5 and ω meet: 0.50 mm<f5×(tan ω)2<1.00 mm;
R9 is a curvature radius of an object-side surface of the fifth lens, and R10 is a curvature radius of an image-side surface of the fifth lens, R9 and R10 meet: 3.00<(R9+R10)/(R9−R10)<5.00;
f is a total effective focal length of the optical imaging lens group, f1 is an effective focal length of the first lens, and f2 is an effective focal length of the second lens, f, f1 and f2 meet: 1.50<(f1+f2)/f<4.00.