US 11,988,814 B2
Camera lens group including seven lenses of +−+−++−, +−++++− or +−++−+− refractive powers
Xue Gao, Yuyao (CN); Jianke Wenren, Yuyao (CN); Fujian Dai, Yuyao (CN); and Liefeng Zhao, Yuyao (CN)
Assigned to ZHEJIANG SUNNY OPTICS CO., LTD., Yuyao (CN)
Filed by Zhejiang Sunny Optics Co., Ltd., Yuyao (CN)
Filed on Feb. 2, 2021, as Appl. No. 17/165,321.
Claims priority of application No. 202010270140.6 (CN), filed on Apr. 8, 2020.
Prior Publication US 2021/0318520 A1, Oct. 14, 2021
Int. Cl. G02B 13/00 (2006.01); G02B 9/64 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/64 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A camera lens group, sequentially from an object side to an image side of the camera lens group along an optical axis, comprising:
a stop;
a first lens having positive refractive power;
a second lens having negative refractive power;
a third lens having positive refractive power;
a fourth lens having refractive power;
a fifth lens having refractive power;
a sixth lens having positive refractive power; and
a seventh lens having negative refractive power,
wherein
Fno≤1.53,
TTL/ImgH≤1.31,
2.00<R2/f1<3.00, and
11.50 mm<f3/f*ImgH<14.00 mm,
where Fno is an aperture number of the camera lens group, TTL is a distance along the optical axis from an object-side surface of the first lens to an imaging plane of the camera lens group, ImgH is half of a diagonal length of an effective pixel area on the imaging plane of the camera lens group, f3 is an effective focal length of the third lens, and f is a total effective focal length of the camera lens group, R2 is a radius of curvature of an image-side surface of the first lens, and f1 is an effective focal length of the first lens.