Patent ID: 7830620

Claim:
An imaging lens comprising: a first lens that has a negative power and includes a concave surface facing an image side; a second lens having a positive power; a third lens having a positive power; a stop; a fourth lens that is a biconcave lens having a negative power; a fifth lens that has a positive power and includes a convex surface facing the image side; and a sixth lens that has a positive power and includes a convex surface facing an object side, wherein the first to sixth lenses are arranged in this order from the object side, the absolute value of the curvature radius of an object-side surface of the second lens is greater than that of the curvature radius of an image-side surface thereof, the Abbe number of a material forming the fourth lens with respect to the d-line is equal to or less than 30, and when the focal length of the entire lens system is f and a composite focal length from the fourth lens to the sixth lens is f 456 , the imaging lens satisfies the following conditional expression: 1.00 <f 456 /f< 1.88.