US 12,455,434 B2
Image pickup lens
Kenichi Kubota, Tokyo (JP)
Assigned to TOKYO VISIONARY OPTICS Co., Ltd., Tokyo (JP)
Filed by Tokyo Visionary Optics Co., Ltd., Tokyo (JP)
Filed on Dec. 27, 2021, as Appl. No. 17/646,099.
Claims priority of application No. 2020-216120 (JP), filed on Dec. 25, 2020.
Prior Publication US 2022/0342181 A1, Oct. 27, 2022
Int. Cl. G02B 13/00 (2006.01); G02B 9/64 (2006.01)
CPC G02B 9/64 (2013.01) [G02B 13/0045 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An imaging lens for forming an image of an object on an image sensor comprising: in order from an object side to an image side,
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 negative refractive power;
a fifth lens;
a sixth lens having negative refractive power;
a seventh lens having negative refractive power; and
an eighth lens having negative refractive power,
wherein the second lens has a convex object-side surface in a paraxial region,
the sixth lens has a concave object-side surface in a paraxial region, and wherein a conditional expression (16) below is satisfied:
35<vd7<85  (16)
where
vd7: an abbe number at the d-line of the seventh lens.