Patent ID: 8922910

Claim:
An imaging lens substantially consisting of five lenses of: a first lens having a meniscus shape with its convex surface facing an object side and negative refractive power; a second lens at least one of the surfaces of which is aspherical; a third lens at least one of the surfaces of which is aspherical; a stop; a fourth lens at least one of the surfaces of which is aspherical; and a fifth lens at least one of the surfaces of which is aspherical, which are in this order from the object side, wherein an image-side surface of the second lens has a concave shape facing an image side and the second lens has negative refractive power, and an object-side surface of the third lens has a convex shape facing the object side and the third lens has positive refractive power, and an image-side surface of the fourth lens has a convex shape facing the image side and the fourth lens has positive refractive power, and the fifth lens has a meniscus shape with its convex surface facing the image side and negative refractive power when it is assumed that each of the second lens through the fifth lens has a whole shape in which its object-side lens surface and its image-side lens surface in a lens cross section including an optical axis have arc shapes, each of which passes through three points of two effective-diameter outermost edge points and a point on the optical axis, and wherein the following conditional formulas (1) and (2) are satisfied: 0.10 <f 34 /L< 0.17 (1); and 0.40 <d 1-4 /L< 0.50 (2), where f 34 : a combined paraxial focal length of the third lens and the fourth lens, L: a distance on the optical axis from an object-side surface of the first lens to an image plane (a distance between the fifth lens and the image plane is a distance in air), and d 1 - 4 : a distance on the optical axis from the object-side surface of the first lens to the image-side surface of the second lens.