US 12,135,409 B2
Optical imaging lens group
Fujian Dai, Ningbo (CN); Kaiyuan Zhang, Ningbo (CN); and Biao Xu, Ningbo (CN)
Assigned to ZHEJIANG SUNNY OPTICAL CO., LTD, Ningbo (CN)
Filed by Zhejiang Sunny Optical Co., Ltd, Ningbo (CN)
Filed on Sep. 24, 2020, as Appl. No. 17/031,234.
Application 17/031,234 is a continuation of application No. PCT/CN2019/099017, filed on Aug. 2, 2019.
Claims priority of application No. 201811268632.0 (CN), filed on Oct. 29, 2018.
Prior Publication US 2021/0003829 A1, Jan. 7, 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. An optical imaging lens group, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, which are sequentially arranged from an object side to an image side of the optical imaging lens group along an optical axis,
wherein,
the first lens has positive refractive power, an object-side surface of the first lens is a convex surface, and an image-side surface of the first lens is a concave surface;
the second lens has negative refractive power, an object-side surface of the second lens is a convex surface, and an image-side surface of the second lens is a concave surface;
the third lens has positive refractive power;
the fourth lens has refractive power;
the fifth lens has refractive power;
the sixth lens has positive refractive power;
the seventh lens has negative refractive power, and an object-side surface of the seventh lens is a concave surface;
wherein TTL/ImgH<1.3, where TTL is a distance along the optical axis from the object-side surface of the first lens to an imaging plane of the optical imaging lens group, and ImgH is half of a diagonal length of an effective pixel area on the imaging plane of the optical imaging lens group, and
4<(CT1+CT2)/(T12×5)<5.5, where CT1 is a center thickness of the first lens along the optical axis, CT2 is a center thickness of the second lens along the optical axis, and T12 is a spaced interval between the first lens and the second lens along the optical axis.