Patent ID: 8334922

Claim:
An imaging lens comprising: in order from an object side, a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a concave surface on an image side near an optical axis thereof and having a positive refractive power; a fourth lens having a positive refractive power near the optical axis thereof; and a fifth lens having a negative refractive power near the optical axis thereof, wherein an image side surface of the fifth lens is concave near the optical axis and has a region where a negative power of the region decreases toward a periphery of the fifth lens as compared with a negative power near the optical axis, wherein the following conditional expression is satisfied: 0.8 <f/f 1<1.5, wherein f1 is a focal length of the first lens, and f is a focal length of the imaging system.