CPC G02B 13/0045 (2013.01) [G02B 9/60 (2013.01); H04N 23/54 (2023.01)] | 5 Claims |
1. An imaging lens comprising in order from an object side to an image side,
a first lens with positive refractive power formed in a biconvex shape having an object-side surface and an image-side surface being convex in a paraxial region,
a second lens with negative refractive power in a paraxial region,
a third lens with the negative refractive power in a paraxial region,
a fourth lens with the negative refractive power in a paraxial region, and
a fifth lens with the positive refractive power having an image-side surface being convex in a paraxial region,
wherein an image-side surface of said third lens is concave in the paraxial region, and the following conditional expressions (1), (2) and (4) are satisfied:
10.00<νd2<30.00 (1)
0.10<|r5|/f<0.90 (2)
2.00<r8/f<35.00 (4)
where
νd2: an abbe number at d-ray of the second lens,
r5: a paraxial curvature radius of an object-side surface of the third lens,
r8: a paraxial curvature radius of an image-side surface of the fourth lens, and
f: a focal length of the overall optical system of the imaging lens.
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