US 12,124,012 B2
Imaging lens
Huang Yunbai, Tokyo (JP)
Assigned to TOKYO VISIONARY OPTICS Co., Ltd., Toyko (JP)
Filed by TOKYO VISIONARY OPTICS CO., LTD., Tokyo (JP)
Filed on Aug. 2, 2021, as Appl. No. 17/391,857.
Application 17/391,857 is a continuation of application No. 16/895,709, filed on Jun. 8, 2020, granted, now 11,867,878.
Claims priority of application No. 2019-149695 (JP), filed on Aug. 19, 2019.
Prior Publication US 2021/0356718 A1, Nov. 18, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 13/00 (2006.01); G02B 9/64 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/64 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An imaging lens comprising in order from an object side to an image side,
a first lens with positive refractive power having an object-side surface being convex in a paraxial region,
a second lens with negative refractive power in a paraxial region,
a third lens with positive refractive power in a paraxial region,
a fourth lens,
a fifth lens with negative refractive power in a paraxial region,
a sixth lens with positive refractive power having an object-side surface being convex in a paraxial region, and
a seventh lens with negative refractive power having an image-side surface being concave in a paraxial region, wherein the following conditional expressions (1), (2), (5′), and (17′) are satisfied:
40.00<vd5<72.00  (1)
3.30<|r10|/f  (2)
−8.50<f5/f<=−4.62  (5′)
1.61<=r5/f<=3.11  (17′)
where
vd5: an abbe number at d-ray of the fifth lens,
r10: a paraxial curvature radius of an image-side surface of the fifth lens,
f5: a focal length of the fifth lens,
r5: a paraxial curvature radius of an object-side surface of the third lens, and
f: a focal length of the overall optical system of the imaging lens.