Patent ID: 6873474

Claim:
An imaging lens having a two-group, two-lens-element construction, said imaging lens comprising, in order from the object side without any intervening lens element: an aperture stop; a first lens element of positive refractive power with its surface on the object side being aspherical and convex near the optical axis and its surface on the image side being aspherical and either convex or concave near the optical axis; and a second lens element of positive refractive power with its surface on the object side being aspherical and convex near the optical axis and its surface on the image side being aspherical and concave near the optical axis but convex toward the periphery; wherein the following Conditions (1) and (2) are satisfied: 0.6 ≦D 3 /D 2 ≦1.0 Condition (1) υ 1 , υ 2 ≧50 Condition (2) where D 3 is the central thickness of the second lens element, D 2 is the distance on the optical axis between the image-side surface of the first lens element and the object-side surface of the second lens element, υ 1 is the Abbe number of the first lens element, and υ 2 is the Abbe number of the second lens element.