Patent ID: 8922910
Filing Date: 2014-12-30
Classification: G02B

Abstract:
1. 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: f 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