Patent ID: 8531784

Claim:
An imaging lens for use in solid-state image sensors, comprising: an aperture stop; a biconvex first lens directing convex surfaces toward an object side and an image side; a second lens directing a convex surface toward the object side near an optical axis and having negative refractive power; a biconvex third lens directing convex surfaces toward the object side and the image side near the optical axis; a fourth lens directing a concave surface toward the object side near the optical axis and having positive refractive power; and a fifth lens directing a convex surface toward the object side near the optical axis and having negative refractive power, wherein the aperture stop and the first to fifth lenses are arranged in this order from the object side of the imaging lens toward an image surface thereof, and a conditional expression 1 is satisfied, the conditional expression 1 being 0.50<f 1 /f<0.76 where f 1 represents the focal length of the first lens and f represents the focal length of the entire imaging lens.