US 11,988,812 B2
Optical imaging lens group
Long Li, Ningbo (CN); and Saifeng Lyu, Ningbo (CN)
Assigned to ZHEJIANG SUNNY OPTICAL CO., LTD, Ningbo (CN)
Filed by ZHEJIANG SUNNY OPTICAL CO., LTD, Ningbo (CN)
Filed on Oct. 1, 2020, as Appl. No. 17/060,632.
Application 17/060,632 is a continuation of application No. PCT/CN2019/084947, filed on Apr. 29, 2019.
Claims priority of application No. 201810871383.8 (CN), filed on Aug. 2, 2018.
Prior Publication US 2021/0018728 A1, Jan. 21, 2021
Int. Cl. G02B 13/00 (2006.01); G02B 9/64 (2006.01); G02B 27/00 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/64 (2013.01); G02B 27/0025 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An optical imaging lens group, sequentially from an object side to an image side along an optical axis, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, each of which has refractive power,
wherein,
each of the first lens and the fourth lens has positive refractive power;
the eighth lens has negative refractive power;
an object-side surface of the third lens is a convex surface, and an image-side surface of the third lens is a concave surface;
an object-side surface of the fourth lens is a concave surface, and an image-side surface of the fourth lens is a convex surface; and
|f/f2|+|f/f3|<1, where f is a total effective focal length of the optical imaging lens group, f2 is an effective focal length of the second lens, and f3 is an effective focal length of the third lens,
wherein 1.8<T67/CT7<3, where T67 is a spaced interval between the sixth lens and the seventh lens along the optical axis, and CT7 is a center thickness of the seventh lens along the optical axis.