US 11,754,806 B2
Imaging lens
Hitoshi Hirano, Tokyo (JP)
Assigned to TOKYO VISIONARY OPTICS CO., LTD., Tokyo (JP)
Filed by TOKYO VISIONARY OPTICS CO., LTD., Tokyo (JP)
Filed on Jun. 5, 2020, as Appl. No. 16/894,375.
Claims priority of application No. 2019-139878 (JP), filed on Jul. 30, 2019.
Prior Publication US 2021/0157096 A1, May 27, 2021
Int. Cl. G02B 13/00 (2006.01); G02B 9/64 (2006.01); G02B 13/06 (2006.01); G02B 27/00 (2006.01); H04N 23/55 (2023.01)
CPC G02B 9/64 (2013.01) [G02B 13/0045 (2013.01); G02B 13/06 (2013.01); G02B 27/0025 (2013.01); H04N 23/55 (2023.01)] 5 Claims
OG exemplary drawing
 
1. An imaging lens forming an image of an object on an image sensor and comprising, in order from an object side to an image side,
a first lens having negative refractive power,
a second lens having negative refractive power,
a third lens having positive refractive power,
a fourth lens,
a fifth lens,
a sixth lens,
a seventh lens, and
an eighth lens having negative refractive power,
wherein said second lens has a convex object-side surface on a paraxial region,
said eighth lens has an aspheric image-side surface having at least one inflection point,
said eighth lens has a meniscus shape comprising a concave image-side surface on a paraxial region, and
the following conditional expression is satisfied:
0.1<R8r/f<0.6
where
f: a focal length of the overall optical system of the imaging lens, and
R8r: a curvature radius of an image-side surface of the eighth lens.