US 12,216,249 B2
Optical imaging lens including six lenses of +-+-+-or +++-+-refractive powers
Nian Chen, Zhejiang (CN); Kaiyuan Zhang, Zhejiang (CN); Xujiong Wu, Zhejiang (CN); Fujian Dai, Zhejiang (CN); and Liefeng Zhao, Zhejiang (CN)
Assigned to ZHEJIANG SUNNY OPTICS CO., LTD., Zhejiang (CN)
Filed by ZHEJIANG SUNNY OPTICS CO., LTD., Zhejiang (CN)
Filed on Jan. 11, 2021, as Appl. No. 17/145,423.
Claims priority of application No. 202010195107.1 (CN), filed on Mar. 19, 2020.
Prior Publication US 2021/0294077 A1, Sep. 23, 2021
Int. Cl. G02B 13/00 (2006.01); G02B 9/62 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/62 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An optical imaging lens, sequentially comprising, from an object side to an image side along an optical axis:
a first lens having positive refractive power;
a second lens having refractive power;
a third lens having refractive power;
a fourth lens having negative refractive power, wherein an object-side surface thereof is a concave surface, while an image-side surface is a convex surface;
a fifth lens having positive refractive power; and
a sixth lens having negative refractive power, wherein an object-side surface thereof is a convex surface; and
TTL is a distance from an object-side surface of the first lens to an imaging surface of the optical imaging lens on the optical axis, ImgH is a half of a diagonal length of an effective pixel region on the imaging surface of the optical imaging lens, TTL and ImgH meet:
4.0 mm<ImgH/(TTL/ImgH)<7.0 mm;
an effective focal length f4 of the fourth lens, an effective focal length f6 of the sixth lens and a total effective focal length f of the optical imaging lens meet:
0.6<(f6−f4)/f<2.0;
an effective focal length f1 of the first lens and an effective focal length f5 of the fifth lens meet:
0.7<f1/f5<1.2;
a curvature radius R7 of the object-side surface of the fourth lens and a curvature radius R8 of the image-side surface of the fourth lens meet:
0.4<R7/R8<0.7;
a maximum effective radius DT11 of the object-side surface of the first lens, a maximum effective radius DT12 of an image-side surface of the first lens and a maximum effective radius DT62 of an image-side surface of the sixth lens meet:
1.3<DT62/(DT11+DT12)<1.7;
a combined focal length f123 of the first lens, the second lens and the third lens and a total effective focal length f of the optical imaging lens meet:
0.7<f123/f<1.0;
1.5<SAG62/SAG32<3.4,
wherein SAG32 is an on-axis distance from an intersection point of an image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens, and SAG62 is an on-axis distance from an intersection point of an image-side surface of the sixth lens and the optical axis to an effective radius vertex of the image-side surface of the sixth lens.