Patent ID: 7423820

Claim:
An imaging lens comprising: in order from an object side of the imaging lens, a first lens having a convex surface directed to the object side on an optical axis and having a positive power; an aperture diaphragm placed between a top position of an object-side surface of the first lens and a position of an image-side surface of the first lens on the optical axis; a second lens having a meniscus shape with a concave surface directed to the object side on the optical axis; and a third lens having a meniscus shape with a convex surface directed to the object side on the optical axis, wherein the imaging lens satisfies all conditional expressions (1) to (3) and 7′: 0.5 <f 1/ f< 2.0 (1) 0.5<(| R 2 |−R 1)/( R 1+ |R 2|)≦1.0 (2) 0.5 <|f 2/ f|< 3.0 (3) v1−v2≧28.2 (7′) wherein f represents a focal length of the imaging lens; f 1 represents a focal length of the first lens; f 2 represents a focal length of the second lens; R 1 represents a radius of curvature of the object-side surface of the first lens; R 2 represents a radius of curvature of the image-side surface of the first lens; and v1 represents an Abbe number of the first lens; and v2 represents an Abbe number of the second lens.