US 12,216,335 B2
Imaging lens
Koji Nitta, Tokyo (JP)
Assigned to TOKYO VISIONARY OPTICS Co., Ltd., Tokyo (JP)
Filed by TOKYO VISIONARY OPTICS Co., Ltd., Tokyo (JP)
Filed on Aug. 2, 2021, as Appl. No. 17/391,713.
Application 17/391,713 is a continuation of application No. 16/811,939, filed on Mar. 6, 2020, granted, now 11,513,319.
Claims priority of application No. 2019-041117 (JP), filed on Mar. 7, 2019.
Prior Publication US 2021/0356700 A1, Nov. 18, 2021
Int. Cl. G02B 9/64 (2006.01); G02B 13/00 (2006.01); G02B 13/18 (2006.01); G02B 3/02 (2006.01); G02B 3/04 (2006.01); G02B 5/00 (2006.01)
CPC G02B 9/64 (2013.01) [G02B 13/18 (2013.01); G02B 3/02 (2013.01); G02B 3/04 (2013.01); G02B 5/005 (2013.01); G02B 13/0045 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An imaging lens comprising in order from an object side to an image side,
a first lens with positive or negative refractive power in a paraxial region,
a second lens with positive or negative refractive power in a paraxial region,
a third lens with positive refractive power in a paraxial region,
a fourth lens with negative refractive power in a paraxial region,
a fifth lens with positive refractive power in a paraxial region,
a sixth lens with positive refractive power in a paraxial region, and
a seventh lens with negative refractive power,
wherein an image-side surface of said first lens is convex in the paraxial region, an object-side surface of said second lens is convex in the paraxial region, and an image-side surface of said sixth lens is concave in the paraxial region, and
wherein the following conditional expressions (4) and (5) are satisfied:
0.10<vd6/vd7<0.60   (4)
0.20<(D1/|f1|)×100<7.50   (5)
where
vd6: an abbe number at d-ray of the sixth lens,
vd7: an abbe number at d-ray of the seventh lens,
D1: a thickness of the first lens along the optical axis, and
f1: a focal length of the first lens.